CJJ 28-1989 Specification for Construction and Acceptance of Urban Heating Pipeline Network Projects CJJ28-89
Some standard content:
Engineering Construction Standard Full Text Information System
Ministry of Construction of the People's Republic of China Standard
City Heating Pipe Network Engineering Construction and Acceptance Specification CJJ28-89
1989 Beijing
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Ministry of Construction of the People's Republic of China Standard
City Heating Pipe Network Engineering Construction and Acceptance Specification CJJ28-89
Editor: Shenyang Thermal Power Heating Company Approval Department: Chinese Ministry of Construction of the People's Republic of China Date of implementation: October 1, 1989
Engineering Construction Standards Full Text Information System
kANiKAca
Engineering Construction Standards Full Text Information System
Notice on the release of the Ministry's standard "City Heating Pipe Network Engineering Construction and Acceptance Specifications"
(89) Jianbiaozi No. 143
"City Heating Pipe Network Engineering Construction and Acceptance Specifications" has been reviewed and approved by our Ministry as a Ministry standard, numbered CJJ28-89, and will be implemented from October 1, 1989. If you have any questions or comments during the implementation process, please inform the main editor of this standard, Shenyang Thermal Power Heating Company.
This standard is published by China Architecture & Building Press and distributed by Xinhua Bookstores in various places. Ministry of Construction of the People's Republic of China
March 27, 1989
Engineering Construction Standards Full-text Information System
Engineering Construction Standards Full-text Information System
Chapter 1
Chapter 2
Engineering Survey:
Section 1
Section 2
Section 3
Section 4
Chapter 3
General Provisions
Line Survey
Leveling Survey·
Completion Survey ·
Civil EngineeringbZxz.net
Section 1
Section 2
Section 3
Chapter 4
Chapter 5
Earthwork
Civil Structural Engineering
Backfill Engineering
Underground Crossing Engineering
Welding and Inspection
Section 1
Section 2
Section 3
Section 4
Chapter 6
General Provisions
Before Welding Preparation
Weld quality inspection
Pipeline installation
Section 1
Section 2
Section 3
Section 4
Section 5
Section 6
General provisions
O0000090100080001000
Pipeline processing and prefabricated pipe fittings production
Pipeline support installation
Trench and overhead pipeline installation
......
Straight Pipeline installation…
Flange and valve installation
+000000000000
Section 7
Compensator installation and cold and hot tightening of pipelines·Heating stations, relay pump stations and heating network general group Chapter 7
Component installation
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......5
Engineering construction standard full text information system
Section 1
General Provisions
Section 2 Pipeline and Equipment Installation of Heating Stations and Relay Pumping StationsSection 3 Installation of General Assembly Parts·
Chapter 8 Anticorrosion and Insulation Engineering
Section 1 Anticorrosion Engineering
Section 2 Insulation Engineering
Section 3
Moisture-proof and Protective Layer
Chapter 9 Pressure Testing, Cleaning and Trial Operation
Section 1 Pressure Testing
Section 2 Cleaning
Section 3 Trial Operation
Chapter 10
Appendix 2||t t||Appendix 3
Appendix 4
Appendix 5
Appendix 6
Appendix 7
Appendix 8
Appendix 9
Appendix 10
Appendix 10
Project Acceptance
Minimum Clearance Distance between Aerial Pipes of Urban Heating Network and Buildings, Structures, Traffic Roads or Overhead Transmission Lines: Minimum Clearance Distance between the Outer Wall of Directly Buried Heating Pipes or the Outer Wall of Heating Network Trench and Other Facilities
Material Brand, Chemical Composition and Mechanical property re-test results Common groove types and sizes of weldments
Butt weld X-ray inspection report.
Butt weld ultrasonic flaw detection report
Weld surface flaw detection report
Pipeline thermal elongation record
Valve test record
Square expansion joint or elbow cold drawing record
Pipe section cold tightening record
Appendix 12
Appendix 13
Appendix 14
Appendix 15
Additional instructions| |tt||Safety valve commissioning record
.........
Heating network water pressure test record
Heating network cleaning record
Heating network trial operation record
List of the editorial unit, participating units and main drafters of this specification81 Engineering Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter I General Provisions
Article 1.0.1 This specification is specially formulated to ensure the construction quality of urban heating network projects.
Article 1.0.2 This specification is applicable to the construction and acceptance of urban heating network projects. The working parameters of the heating network are limited to: 1. Steam network with working pressure P<16×98.1kPa and medium temperature T<350℃; 2. Hot water network with working pressure P<25X98.1kPa and medium temperature T≤<200℃.
Note: The pressure in this specification refers to the gauge pressure. For the pressure value expressed by the product, the multiplicand in front is the gauge pressure number.
Article 1.0.3 The manufacture, inspection and installation of pressure vessels in the heating network shall comply with the current "Pressure Vessel Installation Supervision Regulations" of the State Bureau of Labor and the provisions of this specification.
Article 1.0.4 In the construction of heating network projects in earthquake zones, collapsible loess areas, tunnel areas, quicksand layer areas and corrosive soil areas, in addition to implementing this specification, they shall also comply with the provisions of the current national special specifications. Article 1.0.5 The heating network project shall be constructed according to the design, and the design department shall agree when materials are substituted or changes must be made. Article 1.0.6 The heating pipe network project shall be managed in accordance with the basic construction management procedures stipulated by the state, and the general contractor of the project shall obtain the following documents approved in accordance with the prescribed procedures:
1. Documents approving the construction project of the heating pipe network project; 2. Design drawings and technical documents at each design stage; 3. Estimated estimates of project investment, equipment and materials; 4. Other documents that the construction unit and the design unit should transfer. Engineering Construction Standard Full Text Information System
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Article 1.0.7 The heating pipe network project shall be organized for construction according to the construction organization design, and the single project shall have a construction organization design or technical measures. For the parts that have a major impact on the city appearance, traffic and people's lives, all preparatory work before construction shall be done. Article 1.0.8 Handover and acceptance inspections shall be carried out between various professional construction units and between various processes of the same profession. The unqualified parts of the previous process must be repaired by the original construction unit and qualified.
Article 1.0.9 The general contractor must ensure the safety of the load-bearing structure and the load-bearing structure in the working state, and ensure the quality of welding, anti-corrosion, thermal insulation and equipment installation projects. The quality of the above projects shall be evaluated by the local engineering quality management department. Article 1.0.10 During construction, the stability of buildings near the pipeline network must be ensured to protect the normal operation and safety of other facilities. When there is no clear provision in the design, the minimum clear distance between the heating pipeline network and other facilities shall comply with the provisions of Appendix 1 and Appendix 2 of this specification. Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Chapter 2 Engineering Measurement
Section 1 General Provisions
Article 2.1.1 Engineering measurement of heating pipeline network (hereinafter referred to as pipeline network). It shall comply with the provisions of the current standard "Urban Measurement Specification" (CJJ8) and this specification. Article 2.1.2 The construction unit or design department shall provide the construction unit with the location, number, accuracy level and coordinate and elevation data of the urban plane control network points and urban leveling network points to determine the design line position and elevation of the pipeline network. Article 2.1.3 The accuracy level of the control points used in engineering survey shall be higher than the drawing limit level.
Article 2.1.4 When the accuracy level of the control points used in design survey meets the requirements of engineering survey, the same survey mark shall be used for engineering survey and design survey. Article 2.1.Article 5 The measurement range of the pipe network project should be measured from the outer wall of the heat source (the starting point of the heat network) to the hot spot or the parallel room connected to the user. Article 2.1.6 The centerline piles and leveling points of the heating network pipeline should be set by the translation method outside the line construction operation range for easy observation and use. Section 2 Line measurement
Article 2.2.1 The line measurement of the pipe network project construction should meet the following requirements: 1. It should be carried out in the order of main line, branch line, and user line; 2. The starting point, end point, and intermediate corner points of the main line should be located on the ground; 3. The branch line and user line can be located according to the main line positioning method; 4. The fixed brackets, ground buildings, and underground inspection rooms in the pipe network can be located by steel ruler measurement after the pipeline is located. Article 2.2.2 When the construction drawing uses the analytical method to determine the pipe position, the point position should be determined according to the given coordinate data.
Article 2.2.3 When the construction drawing uses the graphic method to determine the location of the pipeline network, the location of the control points and lines should be determined first. After the control points and lines are verified and confirmed to be correct, the location of the pipeline network points should be determined according to the given values.
Article 2.2.4 The main technical requirements for pipeline measurement should comply with the provisions of Table 2.2.4.
Technical requirements for pipeline measurement
Table 2-2-4
Mean side length of the attached conductor
Mean error in angle measurement
Note: ①n is the number of measuring stations.
②The mean error of the point position should not be greater than 5cm.
Number of measurement loops
Azimuth closure errorRelative closure error of conductor
±40%n
1/3000
③When the conductor is too long (should not exceed 1.5 times the specified length), the absolute closure error should not be greater than 26cm. ④When the conductor length is shorter than the specified length, the absolute closure error should not be greater than 13cm. ③In places where control points are relatively sparse, the conductor is allowed to be attached once at the same level. Article 2.2.5 The spacing between the centerline stakes on the straight section should not be greater than 50m. According to the terrain and conditions, stakes can be added appropriately.
Article 2.2.6 The distance of the centerline of the pipe network can be measured with a calibrated steel ruler. When measuring on a slope, tilt correction should be made. The relative error of the distance measurement should not be greater than 1/1000. Article 2.2.7 In areas where direct measurement is not possible, electromagnetic wave distance meter can be used to measure distance or simple graphics (double triangle, single quadrilateral and rhombus) can be laid out to measure the baseline to indirectly determine the distance.
Article 2.2.8 After the pipeline is aligned, the points should be numbered in sequence, the main centerline piles should be reinforced or marked with stone, and point marks should be drawn. Article 2.2.9 The corner points of the pipeline network should be connected to the nearby permanent projects. The points should be marked on the permanent projects, and the coordinates of the control points should be recorded. When there are no permanent projects nearby, stone marks should be set. When the location of the corner points of the pipeline network is determined by the graphical method, a graphical relationship diagram should be drawn.
Article 2.2.10 After the centerline of the pipeline network is located, the ground obstacles should be checked according to the construction scope. The approximate positions of underground obstacles marked in the construction drawings should be marked on the ground for exploration before construction. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Section 3 Leveling
Article 2.3.1 Before leveling observation, the level and level rod must be fully inspected. The inspection items, methods and requirements can refer to the relevant provisions of the "National Leveling Specifications". During the operation, the i angle of the instrument (the angle between the sighting axis of the level and the axis of the level tube) should be frequently inspected. Article 2.3.2 The closing error of the leveling route should not exceed ±30VL (mm) (L is the length of the route, in km). Leveling must cross rivers and deep ditches. When the line of sight exceeds 200m, the cross-river leveling method should be used. Cross-river leveling should observe one pair of surveys or two single surveys. Two groups should be observed in half a survey. The difference between the two surveys shall not exceed ±40VL (mm)
in km)
(L is the line of sight across the river,
Article 2.3.3 Temporary leveling points should be left near the starting point, end point, pipeline fixed support and underground crossing parts of the pipeline network. The spacing between temporary leveling points along the pipeline network should not be greater than 300m. The temporary leveling point signs should be obvious, the installation should be stable, and they should be properly protected. Article 2.3.4 The elevation of the pipeline support, pipeline, underground inspection room, and ground building between the two fixed supports can be relatively controlled by the elevation of the fixed support. Article 2.3.5 The connection between the heating pipeline network and the heat source The elevation of the pipeline network at the specified location must be checked with the heat source elevation.
Section 4 Completion Measurement
Article 2.4.1 After the completion of the pipeline network project, all plane position and elevation measurements should be carried out, and should meet the requirements of the local urban planning management department. Article 2.4.2 Measurement accuracy requirements:
1. When measuring analytical coordinates, the mean error of the pipeline network point position (referring to the measurement point relative to the adjacent analytical control point) should not be greater than 5cm,
2. The mean error of the elevation of the pipeline network point (referring to the measurement point relative to the adjacent elevation starting point) should not be greater than 2cm;
3. The mean error of the distance between the pipeline network and the adjacent ground buildings, other adjacent pipelines, planned roads or the center lines of existing roads. Use analytical method to survey 1:500~1:2000 Engineering Construction Standard Full-text Information System
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Engineering Construction Standard Full Text Information System
When drawing, it should not be greater than 0.5mm on the drawing. When using the graphical method to survey 1:500~1:1000 drawings, it should not be greater than 0.7mm on the drawing.
Article 2.4.3 The following parts of the pipeline network should be measured for completion data: 1. The coordinates and elevations of the ground buildings;
2. The center coordinates of the fixed bracket and the elevation of the supporting plane, 3. The elevation of the upper surface of the pipeline at the fixed bracket; 4. The center coordinates and elevation of the corner points of the pipeline network plane: 5. The slope change point of the direct buried heating pipeline network should measure the center coordinates and the elevation of the upper surface of the pipeline;
6. The vertical change point of the pipeline elevation should measure the center coordinates and change The elevation of the upper surface of the pipeline at the upper and lower parts of the point,
7. For the pipeline network laid in the trench, the center coordinates of the fixed support and the corner of the trench plane and the elevation of the bottom of the trench and the upper surface of the trench cover should be measured; 8. The center coordinates and the elevation of the bottom of the underground inspection room and the inner surface of the room cover should be measured, and the offset between the center of the pipeline network and the center of the inspection room should be measured and marked;
9. The center coordinates and the elevation of the upper surface of the pipeline should be measured at the pipe fittings (referring to valves, various expansion joints, branch pipe joints, vent pipes, drain pipes, reducers, and various containers). The elevation of the upper surfaces of two pipes with different diameters should be measured at the reducer; 10. When a straight pipeline crosses a road, the center coordinates and the upper surface elevation of the pipeline on both sides of the road should be measured. Where the trench crosses the road, the center coordinates of both sides of the road and the elevation of the trench bottom and the upper surface of the trench cover should be measured;
11. Where the underground crossing structure is located at both ends, the center coordinates and the elevation of the structure bottom and the upper surface of the structure should be measured;
12. For the pipe network laid longitudinally under the traffic road, the distance between the measuring points should not be greater than 50mm;
13. For the overhead pipe network, the center coordinates and the elevation of the support surface of the support and the elevation of the upper surface of the pipe at the support should be measured at all ground supports. Article 2.4.4 For other underground pipelines, lines, and structures that have been exposed during the construction of the pipeline network, the center coordinates, upper surface elevation, and intersection angle with the heating network pipeline should be measured, and the external dimensions of the structure should be measured and recorded. Article 2.4.5 The completion measurement data shall be drawn on the completion drawing according to the following requirements: 1. The measurement marks selected for the completion measurement shall be marked on the general plan of the pipe network; 2. The coordinate data of each measuring point shall be marked on the plan; 3. The elevation data of each measuring point shall be marked on the longitudinal section. Article 2.4.6 The heating pipe network is an important underground pipe network in the city. In addition to implementing this specification, the completion measurement shall also obtain the cooperation and assistance of the urban planning management department. The cover plate may be added or the earthwork may be backfilled only after the urban planning management department deems the engineering measurement qualified. Engineering Construction Standard Full Text Information System
iikAoNiiKAca-Article 2 When the construction drawing uses the analytical method to determine the location of the pipeline, the point position should be determined according to the given coordinate data.
Article 2.2.3 When the construction drawing uses the graphical method to determine the location of the pipeline network, the position of the control points and lines should be determined first. After the control points and lines are verified and confirmed to be correct, the pipeline network points should be determined according to the given values.
Article 2.2.4 The main technical requirements for pipeline measurement should comply with the provisions of Table 2.2.4.
Technical requirements for pipeline measurement
Table 2-2-4
Mean side length of the attached conductor
Mean error in angle measurement
Note: ①n is the number of measuring stations.
②The mean error of the point position should not be greater than 5cm.
Number of measurement loops
Azimuth closure errorRelative closure error of conductor
±40%n
1/3000
③When the conductor is too long (should not exceed 1.5 times the specified length), the absolute closure error should not be greater than 26cm. ④When the conductor length is shorter than the specified length, the absolute closure error should not be greater than 13cm. ③In places where control points are relatively sparse, the conductor is allowed to be attached once at the same level. Article 2.2.5 The spacing between the centerline stakes on the straight section should not be greater than 50m. According to the terrain and conditions, stakes can be added appropriately.
Article 2.2.6 The distance of the centerline of the pipe network can be measured with a calibrated steel ruler. When measuring on a slope, tilt correction should be made. The relative error of the distance measurement should not be greater than 1/1000. Article 2.2.7 In areas where direct measurement is not possible, electromagnetic wave distance meter can be used to measure distance or simple graphics (double triangle, single quadrilateral and rhombus) can be laid out to measure the baseline to indirectly determine the distance.
Article 2.2.8 After the pipeline is aligned, the points should be numbered in sequence, the main centerline piles should be reinforced or marked with stone, and point marks should be drawn. Article 2.2.9 The corner points of the pipeline network should be connected to the nearby permanent projects. The points should be marked on the permanent projects, and the coordinates of the control points should be recorded. When there are no permanent projects nearby, stone marks should be set. When the location of the corner points of the pipeline network is determined by the graphical method, a graphical relationship diagram should be drawn.
Article 2.2.10 After the centerline of the pipeline network is located, the ground obstacles should be checked according to the construction scope. The approximate positions of underground obstacles marked in the construction drawings should be marked on the ground for exploration before construction. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Section 3 Leveling
Article 2.3.1 Before leveling observation, the level and level rod must be fully inspected. The inspection items, methods and requirements can refer to the relevant provisions of the "National Leveling Specifications". During the operation, the i angle of the instrument (the angle between the sighting axis of the level and the axis of the level tube) should be frequently inspected. Article 2.3.2 The closing error of the leveling route should not exceed ±30VL (mm) (L is the length of the route, in km). Leveling must cross rivers and deep ditches. When the line of sight exceeds 200m, the cross-river leveling method should be used. Cross-river leveling should observe one pair of surveys or two single surveys. Two groups should be observed in half a survey. The difference between the two surveys shall not exceed ±40VL (mm)
in km)
(L is the line of sight across the river,
Article 2.3.3 Temporary leveling points should be left near the starting point, end point, pipeline fixed support and underground crossing parts of the pipeline network. The spacing between temporary leveling points along the pipeline network should not be greater than 300m. The temporary leveling point signs should be obvious, the installation should be stable, and they should be properly protected. Article 2.3.4 The elevation of the pipeline support, pipeline, underground inspection room, and ground building between the two fixed supports can be relatively controlled by the elevation of the fixed support. Article 2.3.5 The connection between the heating pipeline network and the heat source The elevation of the pipeline network at the specified location must be checked with the heat source elevation.
Section 4 Completion Measurement
Article 2.4.1 After the completion of the pipeline network project, all plane position and elevation measurements should be carried out, and should meet the requirements of the local urban planning management department. Article 2.4.2 Measurement accuracy requirements:
1. When measuring analytical coordinates, the mean error of the pipeline network point position (referring to the measurement point relative to the adjacent analytical control point) should not be greater than 5cm,
2. The mean error of the elevation of the pipeline network point (referring to the measurement point relative to the adjacent elevation starting point) should not be greater than 2cm;
3. The mean error of the distance between the pipeline network and the adjacent ground buildings, other adjacent pipelines, planned roads or the center lines of existing roads. Use analytical method to survey 1:500~1:2000 Engineering Construction Standard Full-text Information System
TKAONT KAca-
Engineering Construction Standard Full Text Information System
When drawing, it should not be greater than 0.5mm on the drawing. When using the graphical method to survey 1:500~1:1000 drawings, it should not be greater than 0.7mm on the drawing.
Article 2.4.3 The following parts of the pipeline network should be measured for completion data: 1. The coordinates and elevations of the ground buildings;
2. The center coordinates of the fixed bracket and the elevation of the supporting plane, 3. The elevation of the upper surface of the pipeline at the fixed bracket; 4. The center coordinates and elevation of the corner points of the pipeline network plane: 5. The slope change point of the direct buried heating pipeline network should measure the center coordinates and the elevation of the upper surface of the pipeline;
6. The vertical change point of the pipeline elevation should measure the center coordinates and change The elevation of the upper surface of the pipeline at the upper and lower parts of the point,
7. For the pipeline network laid in the trench, the center coordinates of the fixed support and the corner of the trench plane and the elevation of the bottom of the trench and the upper surface of the trench cover should be measured; 8. The center coordinates and the elevation of the bottom of the underground inspection room and the inner surface of the room cover should be measured, and the offset between the center of the pipeline network and the center of the inspection room should be measured and marked;
9. The center coordinates and the elevation of the upper surface of the pipeline should be measured at the pipe fittings (referring to valves, various expansion joints, branch pipe joints, vent pipes, drain pipes, reducers, and various containers). The elevation of the upper surfaces of two pipes with different diameters should be measured at the reducer; 10. When a straight pipeline crosses a road, the center coordinates and the upper surface elevation of the pipeline on both sides of the road should be measured. Where the trench crosses the road, the center coordinates of both sides of the road and the elevation of the trench bottom and the upper surface of the trench cover should be measured;
11. Where the underground crossing structure is located at both ends, the center coordinates and the elevation of the structure bottom and the upper surface of the structure should be measured;
12. For the pipe network laid longitudinally under the traffic road, the distance between the measuring points should not be greater than 50mm;
13. For the overhead pipe network, the center coordinates and the elevation of the support surface of the support and the elevation of the upper surface of the pipe at the support should be measured at all ground supports. Article 2.4.4 For other underground pipelines, lines, and structures that have been exposed during the construction of the pipeline network, the center coordinates, upper surface elevation, and intersection angle with the heating network pipeline should be measured, and the external dimensions of the structure should be measured and recorded. Article 2.4.5 The completion measurement data shall be drawn on the completion drawing according to the following requirements: 1. The measurement marks selected for the completion measurement shall be marked on the general plan of the pipe network; 2. The coordinate data of each measuring point shall be marked on the plan; 3. The elevation data of each measuring point shall be marked on the longitudinal section. Article 2.4.6 The heating pipe network is an important underground pipe network in the city. In addition to implementing this specification, the completion measurement shall also obtain the cooperation and assistance of the urban planning management department. The cover plate may be added or the earthwork may be backfilled only after the urban planning management department deems the engineering measurement qualified. Engineering Construction Standard Full Text Information System
iikAoNiiKAca-Article 2 When the construction drawing uses the analytical method to determine the location of the pipeline, the point position should be determined according to the given coordinate data.
Article 2.2.3 When the construction drawing uses the graphical method to determine the location of the pipeline network, the position of the control points and lines should be determined first. After the control points and lines are verified and confirmed to be correct, the pipeline network points should be determined according to the given values.
Article 2.2.4 The main technical requirements for pipeline measurement should comply with the provisions of Table 2.2.4.
Technical requirements for pipeline measurement
Table 2-2-4
Mean side length of the attached conductor
Mean error in angle measurement
Note: ①n is the number of measuring stations.
②The mean error of the point position should not be greater than 5cm.
Number of measurement loops
Azimuth closure errorRelative closure error of conductor
±40%n
1/3000
③When the conductor is too long (should not exceed 1.5 times the specified length), the absolute closure error should not be greater than 26cm. ④When the conductor length is shorter than the specified length, the absolute closure error should not be greater than 13cm. ③In places where control points are relatively sparse, the conductor is allowed to be attached once at the same level. Article 2.2.5 The spacing between the centerline stakes on the straight section should not be greater than 50m. According to the terrain and conditions, stakes can be added appropriately.
Article 2.2.6 The distance of the centerline of the pipe network can be measured with a calibrated steel ruler. When measuring on a slope, tilt correction should be made. The relative error of the distance measurement should not be greater than 1/1000. Article 2.2.7 In areas where direct measurement is not possible, electromagnetic wave distance meter can be used to measure distance or simple graphics (double triangle, single quadrilateral and rhombus) can be laid out to measure the baseline to indirectly determine the distance.
Article 2.2.8 After the pipeline is aligned, the points should be numbered in sequence, the main centerline piles should be reinforced or marked with stone, and point marks should be drawn. Article 2.2.9 The corner points of the pipeline network should be connected to the nearby permanent projects. The points should be marked on the permanent projects, and the coordinates of the control points should be recorded. When there are no permanent projects nearby, stone marks should be set. When the location of the corner points of the pipeline network is determined by the graphical method, a graphical relationship diagram should be drawn.
Article 2.2.10 After the centerline of the pipeline network is located, the ground obstacles should be checked according to the construction scope. The approximate positions of underground obstacles marked in the construction drawings should be marked on the ground for exploration before construction. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Section 3 Leveling
Article 2.3.1 Before leveling observation, the level and level rod must be fully inspected. The inspection items, methods and requirements can refer to the relevant provisions of the "National Leveling Specifications". During the operation, the i angle of the instrument (the angle between the sighting axis of the level and the axis of the level tube) should be frequently inspected. Article 2.3.2 The closing error of the leveling route should not exceed ±30VL (mm) (L is the length of the route, in km). Leveling must cross rivers and deep ditches. When the line of sight exceeds 200m, the cross-river leveling method should be used. Cross-river leveling should observe one pair of surveys or two single surveys. Two groups should be observed in half a survey. The difference between the two surveys shall not exceed ±40VL (mm)
in km)
(L is the line of sight across the river,
Article 2.3.3 Temporary leveling points should be left near the starting point, end point, pipeline fixed support and underground crossing parts of the pipeline network. The spacing between temporary leveling points along the pipeline network should not be greater than 300m. The temporary leveling point signs should be obvious, the installation should be stable, and they should be properly protected. Article 2.3.4 The elevation of the pipeline support, pipeline, underground inspection room, and ground building between the two fixed supports can be relatively controlled by the elevation of the fixed support. Article 2.3.5 The connection between the heating pipeline network and the heat source The elevation of the pipeline network at the specified location must be checked with the heat source elevation.
Section 4 Completion Measurement
Article 2.4.1 After the completion of the pipeline network project, all plane position and elevation measurements should be carried out, and should meet the requirements of the local urban planning management department. Article 2.4.2 Measurement accuracy requirements:
1. When measuring analytical coordinates, the mean error of the pipeline network point position (referring to the measurement point relative to the adjacent analytical control point) should not be greater than 5cm,
2. The mean error of the elevation of the pipeline network point (referring to the measurement point relative to the adjacent elevation starting point) should not be greater than 2cm;
3. The mean error of the distance between the pipeline network and the adjacent ground buildings, other adjacent pipelines, planned roads or the center lines of existing roads. Use analytical method to survey 1:500~1:2000 Engineering Construction Standard Full-text Information System
TKAONT KAca-
Engineering Construction Standard Full Text Information System
When drawing, it should not be greater than 0.5mm on the drawing. When using the graphical method to survey 1:500~1:1000 drawings, it should not be greater than 0.7mm on the drawing.
Article 2.4.3 The following parts of the pipeline network should be measured for completion data: 1. The coordinates and elevations of the ground buildings;
2. The center coordinates of the fixed bracket and the elevation of the supporting plane, 3. The elevation of the upper surface of the pipeline at the fixed bracket; 4. The center coordinates and elevation of the corner points of the pipeline network plane: 5. The slope change point of the direct buried heating pipeline network should measure the center coordinates and the elevation of the upper surface of the pipeline;
6. The vertical change point of the pipeline elevation should measure the center coordinates and change The elevation of the upper surface of the pipeline at the upper and lower parts of the point,
7. For the pipeline network laid in the trench, the center coordinates of the fixed support and the corner of the trench plane and the elevation of the bottom of the trench and the upper surface of the trench cover should be measured; 8. The center coordinates and the elevation of the bottom of the underground inspection room and the inner surface of the room cover should be measured, and the offset between the center of the pipeline network and the center of the inspection room should be measured and marked;
9. The center coordinates and the elevation of the upper surface of the pipeline should be measured at the pipe fittings (referring to valves, various expansion joints, branch pipe joints, vent pipes, drain pipes, reducers, and various containers). The elevation of the upper surfaces of two pipes with different diameters should be measured at the reducer; 10. When a straight pipeline crosses a road, the center coordinates and the upper surface elevation of the pipeline on both sides of the road should be measured. Where the trench crosses the road, the center coordinates of both sides of the road and the elevation of the trench bottom and the upper surface of the trench cover should be measured;
11. Where the underground crossing structure is located at both ends, the center coordinates and the elevation of the structure bottom and the upper surface of the structure should be measured;
12. For the pipe network laid longitudinally under the traffic road, the distance between the measuring points should not be greater than 50mm;
13. For the overhead pipe network, the center coordinates and the elevation of the support surface of the support and the elevation of the upper surface of the pipe at the support should be measured at all ground supports. Article 2.4.4 For other underground pipelines, lines, and structures that have been exposed during the construction of the pipeline network, the center coordinates, upper surface elevation, and intersection angle with the heating network pipeline should be measured, and the external dimensions of the structure should be measured and recorded. Article 2.4.5 The completion measurement data shall be drawn on the completion drawing according to the following requirements: 1. The measurement marks selected for the completion measurement shall be marked on the general plan of the pipe network; 2. The coordinate data of each measuring point shall be marked on the plan; 3. The elevation data of each measuring point shall be marked on the longitudinal section. Article 2.4.6 The heating pipe network is an important underground pipe network in the city. In addition to implementing this specification, the completion measurement shall also obtain the cooperation and assistance of the urban planning management department. The cover plate may be added or the earthwork may be backfilled only after the urban planning management department deems the engineering measurement qualified. Engineering Construction Standard Full Text Information System
iikAoNiiKAca-Article 7 In areas where direct measurement is not possible, electromagnetic wave distance meter can be used to measure distance or simple graphics (double triangle, single quadrilateral and rhombus) can be laid out to measure the baseline to indirectly determine the distance.
Article 2.2.8 After the pipeline is aligned, the points should be numbered in sequence, the main centerline piles should be reinforced or marked with stone, and point marks should be drawn. Article 2.2.9 The corner points of the pipeline network should be connected to the nearby permanent projects. The points should be marked on the permanent projects, and the coordinates of the control points should be recorded. When there are no permanent projects nearby, stone marks should be set. When the positions of the corner points of the pipeline network are determined by the graphical method, a graphical relationship diagram should be drawn.
Article 2.2.10 After the centerline of the pipeline network is located, the ground obstacles should be checked according to the construction scope. The approximate positions of the underground obstacles marked in the construction drawings should be marked on the ground for exploration before construction. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Section 3 Leveling
Article 2.3.1 Before leveling observation, the level and level rod must be fully inspected. The inspection items, methods and requirements can refer to the relevant provisions of the "National Leveling Specifications". During the operation, the i angle of the instrument (the angle between the sighting axis of the level and the axis of the level tube) should be frequently inspected. Article 2.3.2 The closing error of the leveling route should not exceed ±30VL (mm) (L is the length of the route, in km). Leveling must cross rivers and deep ditches. When the line of sight exceeds 200m, the cross-river leveling method should be used. Cross-river leveling should observe one pair of surveys or two single surveys. Two groups should be observed in half a survey. The difference between the two surveys shall not exceed ±40VL (mm)
in km)
(L is the line of sight across the river,
Article 2.3.3 Temporary leveling points should be left near the starting point, end point, pipeline fixed support and underground crossing parts of the pipeline network. The spacing between temporary leveling points along the pipeline network should not be greater than 300m. The temporary leveling point signs should be obvious, the installation should be stable, and they should be properly protected. Article 2.3.4 The elevation of the pipeline support, pipeline, underground inspection room, and ground building between the two fixed supports can be relatively controlled by the elevation of the fixed support. Article 2.3.5 The connection between the heating pipeline network and the heat source The elevation of the pipeline network at the specified location must be checked with the heat source elevation.
Section 4 Completion Measurement
Article 2.4.1 After the completion of the pipeline network project, all plane position and elevation measurements should be carried out, and should meet the requirements of the local urban planning management department. Article 2.4.2 Measurement accuracy requirements:
1. When measuring analytical coordinates, the mean error of the pipeline network point position (referring to the measurement point relative to the adjacent analytical control point) should not be greater than 5cm,
2. The mean error of the elevation of the pipeline network point (referring to the measurement point relative to the adjacent elevation starting point) should not be greater than 2cm;
3. The mean error of the distance between the pipeline network and the adjacent ground buildings, other adjacent pipelines, planned roads or the center lines of existing roads. Use analytical method to survey 1:500~1:2000 Engineering Construction Standard Full-text Information System
TKAONT KAca-
Engineering Construction Standard Full Text Information System
When drawing, it should not be greater than 0.5mm on the drawing. When using the graphical method to survey 1:500~1:1000 drawings, it should not be greater than 0.7mm on the drawing.
Article 2.4.3 The following parts of the pipeline network should be measured for completion data: 1. The coordinates and elevations of the ground buildings;
2. The center coordinates of the fixed bracket and the elevation of the supporting plane, 3. The elevation of the upper surface of the pipeline at the fixed bracket; 4. The center coordinates and elevation of the corner points of the pipeline network plane: 5. The slope change point of the direct buried heating pipeline network should measure the center coordinates and the elevation of the upper surface of the pipeline;
6. The vertical change point of the pipeline elevation should measure the center coordinates and change The elevation of the upper surface of the pipeline at the upper and lower parts of the point,
7. For the pipeline network laid in the trench, the center coordinates of the fixed support and the corner of the trench plane and the elevation of the bottom of the trench and the upper surface of the trench cover should be measured; 8. The center coordinates and the elevation of the bottom of the underground inspection room and the inner surface of the room cover should be measured, and the offset between the center of the pipeline network and the center of the inspection room should be measured and marked;
9. The center coordinates and the elevation of the upper surface of the pipeline should be measured at the pipe fittings (referring to valves, various expansion joints, branch pipe joints, vent pipes, drain pipes, reducers, and various containers). The elevation of the upper surfaces of two pipes with different diameters should be measured at the reducer; 10. When a straight pipeline crosses a road, the center coordinates and the upper surface elevation of the pipeline on both sides of the road should be measured. Where the trench crosses the road, the center coordinates of both sides of the road and the elevation of the trench bottom and the upper surface of the trench cover should be measured;
11. Where the underground crossing structure is located at both ends, the center coordinates and the elevation of the structure bottom and the upper surface of the structure should be measured;
12. For the pipe network laid longitudinally under the traffic road, the distance between the measuring points should not be greater than 50mm;
13. For the overhead pipe network, the center coordinates and the elevation of the support surface of the support and the elevation of the upper surface of the pipe at the support should be measured at all ground supports. Article 2.4.4 For other underground pipelines, lines, and structures that have been exposed during the construction of the pipeline network, the center coordinates, upper surface elevation, and intersection angle with the heating network pipeline should be measured, and the external dimensions of the structure should be measured and recorded. Article 2.4.5 The completion measurement data shall be drawn on the completion drawing according to the following requirements: 1. The measurement marks selected for the completion measurement shall be marked on the general plan of the pipe network; 2. The coordinate data of each measuring point shall be marked on the plan; 3. The elevation data of each measuring point shall be marked on the longitudinal section. Article 2.4.6 The heating pipe network is an important underground pipe network in the city. In addition to implementing this specification, the completion measurement shall also obtain the cooperation and assistance of the urban planning management department. The cover plate may be added or the earthwork may be backfilled only after the urban planning management department deems the engineering measurement qualified. Engineering Construction Standard Full Text Information System
iikAoNiiKAca-Article 7 In areas where direct measurement is not possible, electromagnetic wave distance meter can be used to measure distance or simple graphics (double triangle, single quadrilateral and rhombus) can be laid out to measure the baseline to indirectly determine the distance.
Article 2.2.8 After the pipeline is aligned, the points should be numbered in sequence, the main centerline piles should be reinforced or marked with stone, and point marks should be drawn. Article 2.2.9 The corner points of the pipeline network should be connected to the nearby permanent projects. The points should be marked on the permanent projects, and the coordinates of the control points should be recorded. When there are no permanent projects nearby, stone marks should be set. When the positions of the corner points of the pipeline network are determined by the graphical method, a graphical relationship diagram should be drawn.
Article 2.2.10 After the centerline of the pipeline network is located, the ground obstacles should be checked according to the construction scope. The approximate positions of the underground obstacles marked in the construction drawings should be marked on the ground for exploration before construction. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Section 3 Leveling
Article 2.3.1 Before leveling observation, the level and level rod must be fully inspected. The inspection items, methods and requirements can refer to the relevant provisions of the "National Leveling Specifications". During the operation, the i angle of the instrument (the angle between the sighting axis of the level and the axis of the level tube) should be frequently inspected. Article 2.3.2 The closing error of the leveling route should not exceed ±30VL (mm) (L is the length of the route, in km). Leveling must cross rivers and deep ditches. When the line of sight exceeds 200m, the cross-river leveling method should be used. Cross-river leveling should observe one pair of surveys or two single surveys. Two groups should be observed in half a survey. The difference between the two surveys shall not exceed ±40VL (mm)
in km)
(L is the line of sight across the river,
Article 2.3.3 Temporary leveling points should be left near the starting point, end point, pipeline fixed support and underground crossing parts of the pipeline network. The spacing between temporary leveling points along the pipeline network should not be greater than 300m. The temporary leveling point signs should be obvious, the installation should be stable, and they should be properly protected. Article 2.3.4 The elevation of the pipeline support, pipeline, underground inspection room, and ground building between the two fixed supports can be relatively controlled by the elevation of the fixed support. Article 2.3.5 The connection between the heating pipeline network and the heat source The elevation of the pipeline network at the specified location must be checked with the heat source elevation.
Section 4 Completion Measurement
Article 2.4.1 After the completion of the pipeline network project, all plane position and elevation measurements should be carried out, and should meet the requirements of the local urban planning management department. Article 2.4.2 Measurement accuracy requirements:
1. When measuring analytical coordinates, the mean error of the pipeline network point position (referring to the measurement point relative to the adjacent analytical control point) should not be greater than 5cm,
2. The mean error of the elevation of the pipeline network point (referring to the measurement point relative to the adjacent elevation starting point) should not be greater than 2cm;
3. The mean error of the distance between the pipeline network and the adjacent ground buildings, other adjacent pipelines, planned roads or the center lines of existing roads. Use analytical method to survey 1:500~1:2000 Engineering Construction Standard Full-text Information System
TKAONT KAca-
Engineering Construction Standard Full Text Information System
When drawing, it should not be greater than 0.5mm on the drawing. When using the graphical method to survey 1:500~1:1000 drawings, it should not be greater than 0.7mm on the drawing.
Article 2.4.3 The following parts of the pipeline network should be measured for completion data: 1. The coordinates and elevations of the ground buildings;
2. The center coordinates of the fixed bracket and the elevation of the supporting plane, 3. The elevation of the upper surface of the pipeline at the fixed bracket; 4. The center coordinates and elevation of the corner points of the pipeline network plane: 5. The slope change point of the direct buried heating pipeline network should measure the center coordinates and the elevation of the upper surface of the pipeline;
6. The vertical change point of the pipeline elevation should measure the center coordinates and change The elevation of the upper surface of the pipeline at the upper and lower parts of the point,
7. For the pipeline network laid in the trench, the center coordinates of the fixed support and the corner of the trench plane and the elevation of the bottom of the trench and the upper surface of the trench cover should be measured; 8. The center coordinates and the elevation of the bottom of the underground inspection room and the inner surface of the room cover should be measured, and the offset between the center of the pipeline network and the center of the inspection room should be measured and marked;
9. The center coordinates and the elevation of the upper surface of the pipeline should be measured at the pipe fittings (referring to valves, various expansion joints, branch pipe joints, vent pipes, drain pipes, reducers, and various containers). The elevation of the upper surfaces of two pipes with different diameters should be measured at the reducer; 10. When a straight pipeline crosses a road, the center coordinates and the upper surface elevation of the pipeline on both sides of the road should be measured. Where the trench crosses the road, the center coordinates of both sides of the road and the elevation of the trench bottom and the upper surface of the trench cover should be measured;
11. Where the underground crossing structure is located at both ends, the center coordinates and the elevation of the structure bottom and the upper surface of the structure should be measured;
12. For the pipe network laid longitudinally under the traffic road, the distance between the measuring points should not be greater than 50mm;
13. For the overhead pipe network, the center coordinates and the elevation of the support surface of the support and the elevation of the upper surface of the pipe at the support should be measured at all ground supports. Article 2.4.4 For other underground pipelines, lines, and structures that have been exposed during the construction of the pipeline network, the center coordinates, upper surface elevation, and intersection angle with the heating network pipeline should be measured, and the external dimensions of the structure should be measured and recorded. Article 2.4.5 The completion measurement data shall be drawn on the completion drawing according to the following requirements: 1. The measurement marks selected for the completion measurement shall be marked on the general plan of the pipe network; 2. The coordinate data of each measuring point shall be marked on the plan; 3. The elevation data of each measuring point shall be marked on the longitudinal section. Article 2.4.6 The heating pipe network is an important underground pipe network in the city. In addition to implementing this specification, the completion measurement shall also obtain the cooperation and assistance of the urban planning management department. The cover plate may be added or the earthwork may be backfilled only after the urban planning management department deems the engineering measurement qualified. Engineering Construction Standard Full Text Information System
iikAoNiiKAca-2 measurement accuracy requirements:
1. When measuring analytical coordinates, the mean error of the pipe network point position (referring to the measurement point relative to the adjacent analytical control point) should not be greater than 5cm,
2. The mean error of the pipe network point elevation (referring to the measurement point relative to the adjacent elevation starting point) should not be greater than 2cm;
3. The mean error of the distance between the pipe network and the adjacent ground buildings, adjacent other pipelines, planned roads or the center line of existing roads. When using the analytical method to survey 1:500~1:2000 engineering construction standard full-text information system
TKAONT KAca-
Engineering Construction Standard Full-text Information System
, it should not be greater than 0.5mm on the map. When using the graphical method to survey 1:500~1:1000 maps, it should not be greater than 0.7mm on the map.
Article 2.4.3 The following parts of the pipe network should be measured for completion data: 1. The coordinates and elevations of the ground buildings;
2. The center coordinates of the fixed bracket and the elevation of the supporting plane; 3. The elevation of the upper surface of the pipe at the fixed bracket; 4. The center coordinates and elevation of the corner points of the pipe network plane; 5. The slope change point of the direct buried heating pipe network should measure the center coordinates and the elevation of the upper surface of the pipe;
6. The vertical change point of the pipe elevation should measure the center coordinates and the elevation of the upper surface of the pipe above and below the change point;
7. The pipe network laid in the trench should measure the center coordinates of the fixed bracket. , the center coordinates of the trench plane corners and the elevations of the trench bottom and the upper surface of the trench cover; 8. The center coordinates of the underground inspection room and the elevations of the bottom and the inner surface of the room cover should be measured. The offset between the center of the pipe network and the center of the inspection room should be measured and marked;
9. The center coordinates and the upper surface elevations of the pipes should be measured at the pipe fittings (valves, various expansion joints, branch pipe joints, vent pipes, drain pipes, reducers, and various containers). The upper surface elevations of two pipes of different diameters should be measured at the reducer; 10. When a straight pipeline crosses a road, the center coordinates and upper surface elevations of the pipes on both sides of the road should be measured. Where the trench crosses the road, the center coordinates of both sides of the road and the elevation of the trench bottom and the upper surface of the trench cover should be measured;
11. Where the underground crossing structure is located at both ends, the center coordinates and the elevation of the structure bottom and the upper surface of the structure should be measured;
12. For the pipe network laid longitudinally under the traffic road, the distance between the measuring points should not be greater than 50mm;
13. For the overhead pipe network, the center coordinates and the elevation of the support surface of the support and the elevation of the upper surface of the pipe at the support should be measured at all ground supports. Article 2.4.4 For other underground pipelines, lines, and structures that have been exposed during the construction of the pipeline network, the center coordinates, upper surface elevation, and intersection angle with the heating network pipeline should be measured, and the external dimensions of the structure should be measured and recorded. Article 2.4.5 The completion measurement data shall be drawn on the completion drawing according to the following requirements: 1. The measurement marks selected for the completion measurement shall be marked on the general plan of the pipe network; 2. The coordinate data of each measuring point shall be marked on the plan; 3. The elevation data of each measuring point shall be marked on the longitudinal section. Article 2.4.6 The heating pipe network is an important underground pipe network in the city. In addition to implementing this specification, the completion measurement shall also obtain the cooperation and assistance of the urban planning management department. The cover plate may be added or the earthwork may be backfilled only after the urban planning management department deems the engineering measurement qualified. Engineering Construction Standard Full Text Information System
iikAoNiiKAca-2 measurement accuracy requirements:
1. When measuring analytical coordinates, the mean error of the pipe network point position (referring to the measurement point relative to the adjacent analytical control point) should not be greater than 5cm,
2. The mean error of the pipe network point elevation (referring to the measurement point relative to the adjacent elevation starting point) should not be greater than 2cm;
3. The mean error of the distance between the pipe network and the adjacent ground buildings, adjacent other pipelines, planned roads or the center line of existing roads. When using the analytical method to survey 1:500~1:2000 engineering construction standard full-text information system
TKAONT KAca-
Engineering Construction Standard Full-text Information System
, it should not be greater than 0.5mm on the map. When using the graphical method to survey 1:500~1:1000 maps, it should not be greater than 0.7mm on the map.
Article 2.4.3 The following parts of the pipe network should be measured for completion data: 1. The coordinates and elevations of the ground buildings;
2. The center coordinates of the fixed bracket and the elevation of the supporting plane; 3. The elevation of the upper surface of the pipe at the fixed bracket; 4. The center coordinates and elevation of the corner points of the pipe network plane; 5. The slope change point of the direct buried heating pipe network should measure the center coordinates and the elevation of the upper surface of the pipe;
6. The vertical change point of the pipe elevation should measure the center coordinates and the elevation of the upper surface of the pipe above and below the change point;
7. The pipe network laid in the trench should measure the center coordinates of the fixed bracket. , the center coordinates of the trench plane corners and the elevations of the trench bottom and the upper surface of the trench cover; 8. The center coordinates of the underground inspection room and the elevations of the bottom and the inner surface of the room cover should be measured. The offset between the center of the pipe network and the center of the inspection room should be measured and marked;
9. The center coordinates and the upper surface elevations of the pipes should be measured at the pipe fittings (valves, various expansion joints, branch pipe joints, vent pipes, drain pipes, reducers, and various containers). The upper surface elevations of two pipes of different diameters should be measured at the reducer; 10. When a straight pipeline crosses a road, the center coordinates and upper surface elevations of the pipes on both sides of the road should be measured. Where the trench crosses the road, the center coordinates of b
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