CJJ 61-1994 Technical Specification for Urban Underground Pipeline Detection CJJ61-94
Some standard content:
Engineering Construction Standard Full Text Information System
Industry Standard of the People's Republic of China
Technical specification for detecting and surveying underground pipelines and cables in cityCJJ
61—94
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Industry Standard of the People's Republic of China
Technical specification for detecting and surveying underground pipelines and cables in cityCJJ
61—94
Editing unit: Shanghai Geotechnical Engineering Survey and Design InstituteApproving unit: Ministry of Construction of the People's Republic of ChinaEffective date: 1:
July 1, 1995
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Notice on the Release of the Industry Standard "Technical Code for Detection of Urban Underground Pipelines"
Construction Standard [1994] No. 729
In accordance with the requirements of the Ministry of Construction's Construction Standard [1992] No. 227, the "Technical Code for Detection of Urban Underground Pipelines" edited by Shanghai Geotechnical Engineering Survey and Design Institute has been reviewed and approved as an industry standard, numbered CJJ61-94, and will be implemented on July 1, 1995.
This standard is managed by the Ministry of Construction's Survey and Geotechnical Engineering Standards and Technology Unit, the Ministry of Construction's Comprehensive Survey Institute, and the specific interpretation and other work is the responsibility of the editor-in-chief. It is published by the Ministry of Construction's Standards and Norms Institute. Ministry of Construction of the People's Republic of China
December 5, 1994
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General Provisions
Exploration of Underground Pipelines
General Provisions·
3.2 Field Survey
Geophysical Exploration Methods and Techniques for Exploration of Underground Pipelines3.4
Technical Requirements for Exploration Instruments
Setting of Ground Pipeline Point Marks
Quality Inspection of Exploration Work
Underground Pipeline Measurement
General Provisions
Controlled Measurement of Underground Pipelines
4.3 Already Underground pipeline measurement
4.4 Underground pipeline alignment measurement and completion measurement·4.5 Underground civil air defense tunnel measurement
4.6 Inspection of measurement results quality
5 Compilation of underground pipeline map
General provisions
5.2 Compilation of professional pipeline map
5.3 Compilation of comprehensive pipeline map
5.4 Compilation of pipeline cross-section map
6 Report writing and results acceptance
General provisions
6.2 Report writing
Results acceptance
Results submission
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Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
Appendix F
Appendix G
Safety Protection Provisions for Underground Pipeline Detection
0000000000
++0++++0.+0000..000
Pipeline Point Survey Form, Exploration Record Form and Pipeline Point Results FormObvious Pipeline Point Survey Form (Underground Pipeline)Obvious Pipeline Point Survey Form (Underground Cable)Underground Pipeline Exploration Record Form
Pipeline Point Results Form
Types of Geophysical Exploration Methods for Exploring Underground Pipelines
Codes and Colors of Underground Pipelines
Ground Legend of underground pipeline drawings
Underground pipeline drawing sample
Example of professional pipeline drawings (water supply pipeline drawings)
Example of comprehensive pipeline drawings
Example of underground pipeline longitudinal section drawings…
Example of underground pipeline cross-section drawings
Explanation of terms used in this code·
Additional explanation
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…Insert
·Insert
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1 General provisions
1 This code is formulated to unify the technical requirements for urban underground pipeline exploration, measurement and drawing, and to provide basic information on the current status of various underground pipeline laying required by urban planning, design, construction and management departments. 1.0.2
This code is applicable to the detection and mapping of various metal and non-metal underground pipelines or cables for different purposes buried in urban areas or suburbs, and is also applicable to the detection and mapping of underground civil air defense tunnels.
1.0.3 In addition to complying with this code, the detection of urban underground pipelines shall also comply with the provisions of the relevant current national standards and specifications.
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2 General Provisions
2.0.1 The objects of underground pipeline detection shall include various pipelines such as water supply, drainage, gas, heat, industry, and power and telecommunication cables buried underground. 2.0.2 The detection of underground pipelines shall identify the plane position, direction, buried depth (or elevation), specifications, properties, materials, etc. of the underground pipelines, and compile underground pipeline maps. 2.0.3 Underground pipeline detection can be divided into four categories according to the detection task, namely, municipal public pipeline detection, factory or residential area pipeline detection, construction site pipeline detection and special pipeline detection. The requirements and scope of each type of detection shall comply with the following provisions: 2.0.3.1 Municipal public pipeline detection shall be carried out in accordance with the requirements of the urban planning management department or the public utility construction department, and its scope shall include roads, squares and other areas where trunk pipelines pass.
2.0.3.2 Factory or residential area pipeline detection shall be carried out in accordance with the requirements of the factory or residential area pipeline design and management department, and its detection scope shall include the area under the jurisdiction of the factory or residential area.
2.0.3.3 Construction site pipeline detection shall be carried out before excavation of a certain project, and its scope shall include excavation, underground pipeline safety that may be affected by excavation, and areas necessary for identifying underground pipelines.
2.0.3.4 Special pipeline detection should be carried out according to the requirements of the planning, design, construction and management departments of a pipeline project, and its detection range should include the area where the pipeline project is laid.
The scale of the basic topographic map for underground pipeline detection can be selected according to Table 2.0.4.
2.0.5 The accuracy of urban underground pipeline detection should comply with the following provisions: 2.0.5.1 The detection accuracy of concealed pipeline points is divided into three levels. The horizontal position tolerance and burial depth tolerance of each level of accuracy detection should comply with the provisions of Table 2.0.5.1. The tolerance value is calculated as twice the mean error.
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Selection of Basic Topographic Map Scale for Underground Pipeline Detection Detection Category
Municipal Public
Pipeline Detection
Pipeline Detection in Factory or Residential Area
Pipeline Detection in Construction Site
Special Pipeline Detection
Detection Accuracy of Concealed Pipeline Points
Accuracy Level
Horizontal Position Limit 6us (cm)
±(5+0.05h)
±(5+0.08h)
±(5+0.12h ）
Note: 1.h is the central burial depth of underground pipelines, in centimeters; Table 2.0.4
Selected scale
1*500~1:2000
1:1000~1:5000
1:500~1:1000
1:200~1:1000
1:500~1:5000
Table 2.0.5.1bzxz.net
Burial depth limit (cm)
±(5+0.07h）
±(5+0.12h)
±（5+0.18h）
2. When h≤70cm, the depth tolerance tm is calculated by using h=70cm; the horizontal position tolerance is still calculated by using the actual depth h value. 3. If there are special requirements for the detection accuracy, it can be determined according to the needs of the project. The error in the analytical coordinates of the measuring pipeline point (referring to the measuring point relative to the adjacent 2.0.5.2
Analysis control point) shall not be greater than ±5cm; the elevation error (referring to the measurement point relative to the adjacent elevation control point) shall not be greater than ±2cm.
The analytical coordinate error of the detected pipeline point (referring to the actual pipeline point relative to the adjacent analytical control point) shall not be greater than the provisions in Table 2.0.5.3. The elevation error (referring to the elevation of the actual pipeline point relative to the adjacent elevation control point) shall not be greater than 0.58t, 0m is the detection depth limit specified in Table 2.0.5.1. Analysis coordinate error of the detected pipeline point
Accuracy level
Coordinate error m
±(5+0.02h)
±(5+0.035h)
±(5+0.055h)
Note, h is the central burial depth of the underground pipeline, measured in centimeters. 2.0.5.4
Table 2.0.5.3
The mean error of the measurement points on the underground pipeline map shall not be greater than ±0.5mm; the mean error of the detection points on the underground pipeline map shall not be greater than ±(0.5+0.25gts/Engineering Construction Standard Full-text Information System
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M)mm, where M is the denominator of the mapping scale. 2.0.6 The coordinate and elevation systems used for municipal public pipeline detection and special pipeline detection must be consistent with the local city coordinate and elevation systems. The local building coordinate system can be used for pipeline detection in factory areas or residential areas and pipeline detection at construction sites, but a conversion relationship should be established with the local city coordinate system. 2.0.7 The detection of underground pipelines should follow the following basic procedures: accepting tasks, collecting data, on-site investigation, method testing, compiling technical design, field investigation, instrument detection, establishing measurement control, pipeline point measurement, underground pipeline map compilation, report writing and results acceptance. When detecting a single type of pipe or the workload is small, the above work procedures can be simplified.
2.0.8 The detection task of underground pipelines should be issued by the superior department of the professional detection unit in the form of a task book, or commissioned by the user unit in the form of a letter of entrustment. The assignment or letter of entrustment should include the following: project name, location and scope of the work area, work purpose and accuracy level requirements, work deadline and results to be submitted, etc. 2.0.9 Before the on-site detection of underground pipelines, the existing underground pipeline data and relevant surveying and mapping data within the survey area must be fully collected and sorted out, which should include the following: (1) Existing maps of various underground pipelines:
(2) Design drawings, construction drawings, completion drawings and technical specifications of various pipelines; (3) Topographic maps of corresponding scales;
(4) Coordinates and elevations of the survey area and its adjacent survey control points. 2.0.10 On-site investigation should be carried out on the basis of collecting, sorting and analyzing existing data. The tasks of the investigation are:
(1) Verify the collected data and evaluate the credibility and availability of the data; (2) Inspect the ground features, landforms, transportation and underground pipeline distribution exposure, geophysical conditions and various possible interference factors in the work area; (3) Verify the location of the survey control points in the survey area. 2.0.11 Based on the data collection and field survey, a schematic diagram of underground pipeline detection should be prepared. The schematic diagram can be a 1:5000 or 1:10000 topographic map, or a topographic sketch. The detection range and the distribution of underground pipelines within and adjacent to the range should be marked on the map.
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2.0.12 Based on the collected data and the results of the field survey, reasonable underground pipeline detection methods and technologies should be selected, and necessary method tests should be carried out. The method test should comply with the provisions of Article 3.3.4 of this Code.
2.0.13 A technical design should be prepared for the underground pipeline detection project. The technical design should include the following contents:
(1) The purpose, tasks, scope and deadline of the detection work; (2) The topography of the work area, the overview of underground pipelines, traffic conditions and related geophysical characteristics;
(3) Analysis of the effectiveness of the detection method, working methods and field work arrangements; (4) Estimation of workload and work progress;
(5) Labor organization, instruments, equipment and material plans; (6) Results and materials to be submitted;
(7) Existing problems and solutions.
Note: When the detection task is simple or the workload is small, the technical design can be simplified. 2.0.14 The computer underground pipeline mapping system and database shall meet the relevant technical requirements of this regulation.
2.0.15 Field operations for underground pipeline detection must comply with the relevant safety protection regulations in Appendix A of this regulation.
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3 Detection of Underground Pipelines
3.1 General Provisions
3.1.1 The detection of underground pipelines should ascertain the laying conditions of various underground pipelines and their projection positions and burial depths on the ground on site, and set pipeline point signs on the ground. 3.1.2 Pipeline points are divided into obvious pipeline points and concealed pipeline points. Field investigation and measurement of underground pipelines should be carried out at obvious pipeline points. Instruments should be used to detect the ground projection position and burial depth of underground pipelines at concealed pipeline points. 3.1.3 Pipeline points should be set at the characteristic points of the pipeline or its ground projection position. Pipeline characteristic points include intersections, branch points, turning points, starting and ending points, and the center points of ancillary facilities on the pipeline.
3.1.4 On pipeline sections without characteristic points, the distance between pipeline points for detecting various types of pipelines shall comply with the following provisions.
(1) For municipal public pipeline detection and special pipeline detection, the distance between pipeline points should be set at 15 to 30 cm on the corresponding scale topographic map; (2) For pipeline detection in factory areas or residential areas, the distance between pipeline points should be set at 10 to 20 cm on the corresponding scale topographic map; (3) For pipeline detection at construction sites, one pipeline point should be set every 510 m on site. 3.1.5 Underground pipeline exploration must be carried out on the basis of fully collecting and analyzing existing data, using a combination of field investigation and instrument exploration. 3.1.6 The numbering and marking of pipeline points should be represented by a symbol consisting of three parts: pipeline code, pipeline number and pipeline point sequence number. The pipeline code should be marked with Chinese phonetic letters according to Appendix D, and the pipeline number and pipeline point sequence number should be marked with Arabic numerals, with the symbol "-" added between them.
3.1.7 The selection criteria for underground pipeline detection should be determined according to the specific conditions of each city, the density of pipelines and the requirements of the client. The detection of municipal public pipelines should be selected according to Table 6 Engineering Quantity Standard Full-text Information System
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3.1.7.
Selection criteria for municipal public pipeline detection
Pipeline categories
Pipelines to be detected
Pipeline diameter>50mm or ≥100mm
Pipeline diameter≥200mm or ≥300mm
Pipeline diameter>50mm or ≥75mm
Underground pipeline detection should actively adopt new methods and technologies that have been proven to be effective through method tests and meet the accuracy requirements specified in Section 2.0.5.1 of this Code. 3.2 Field investigation
1 The underground pipelines and their ancillary facilities exposed at obvious pipeline points should be investigated, recorded and measured in detail, and the situation of each pipeline should be clarified. The pipeline point investigation form should be filled in according to the format of Appendix B. The items for field investigation of various underground pipelines can be selected according to Table 3.2.1.
It is advisable to invite personnel who are familiar with the underground pipelines in the area to participate in the field investigation. 3.2.2
During the field investigation, the nature and type of each pipeline should be found out. 3.2.3
3.2.3.1 Water supply pipelines can be divided into domestic water, production water and fire water according to the purpose of water supply.
Drainage pipelines can be divided into industrial wastewater, domestic sewage and rainwater according to the nature of drainage.
Gas pipelines can be divided into coal gas, liquefied gas and natural gas according to the properties of the gas they transmit; they can be divided into low pressure, medium pressure and high pressure according to the pressure of the gas pipeline: low pressure
pressure ≤<5kPa;
pressure>5kPa, <0.4MPa
pressure>0.4MPa, ≤1.6MPa.
Industrial pipelines can be divided into hydrogen, oxygen, ethylene according to the properties of the materials they transmit. 3.2.3.4
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KAONTKAca=1. The detection depth tolerance specified in the regulations. Mean error of analytical coordinates of detection pipeline points
Accuracy level
Mean error of coordinates m
±(5+0.02h)
±(5+0.035h)
±(5+0.055h)
Note, h is the central depth of the underground pipeline, in centimeters. 2.0.5.4
Table 2.0.5.3
The mean error of the measurement point on the underground pipeline map shall not be greater than ±0.5mm; the mean error of the detection point on the underground pipeline map shall not be greater than ±(0.5+0.25gts/Engineering Construction Standard Full-text Information System
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M) mm, where M is the denominator of the mapping scale. 2.0.6 The coordinate and elevation system used for municipal public pipeline detection and special pipeline detection must be consistent with the local city coordinate and elevation system. The local building coordinate system can be used for pipeline detection in factory areas or residential areas and pipeline detection at construction sites, but a conversion relationship should be established with the local city coordinate system. 2.0.7 The detection of underground pipelines should follow the following basic procedures: accepting tasks, collecting information, on-site investigation, method testing, compiling technical designs, field investigations, instrument detection, establishing measurement control, pipeline point connection measurement, underground pipeline map compilation, report writing and results acceptance. When detecting a single type of pipe or the workload is small, the above work procedures can be simplified.
2.0.8 The underground pipeline detection task should be issued by the superior department of the professional detection unit in the form of a task book, or commissioned by the user unit in the form of a letter of entrustment. The assignment or letter of entrustment should include the following: project name, location and scope of the work area, work purpose and accuracy level requirements, work deadline and results to be submitted, etc. 2.0.9 Before the on-site detection of underground pipelines, the existing underground pipeline data and relevant surveying and mapping data within the survey area must be fully collected and sorted out, which should include the following: (1) Existing maps of various underground pipelines:
(2) Design drawings, construction drawings, completion drawings and technical specifications of various pipelines; (3) Topographic maps of corresponding scales;
(4) Coordinates and elevations of the survey area and its adjacent survey control points. 2.0.10 On-site investigation should be carried out on the basis of collecting, sorting and analyzing existing data. The tasks of the investigation are:
(1) Verify the collected data and evaluate the credibility and availability of the data; (2) Inspect the ground features, landforms, transportation and underground pipeline distribution exposure, geophysical conditions and various possible interference factors in the work area; (3) Verify the location of the survey control points in the survey area. 2.0.11 Based on the data collection and field survey, a schematic diagram of underground pipeline detection should be prepared. The schematic diagram can be a 1:5000 or 1:10000 topographic map, or a topographic sketch. The detection range and the distribution of underground pipelines within and adjacent to the range should be marked on the map.
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2.0.12 Based on the collected data and the results of the field survey, reasonable underground pipeline detection methods and technologies should be selected, and necessary method tests should be carried out. The method test should comply with the provisions of Article 3.3.4 of this Code.
2.0.13 A technical design should be prepared for the underground pipeline detection project. The technical design should include the following contents:
(1) The purpose, tasks, scope and deadline of the detection work; (2) The topography of the work area, the overview of underground pipelines, traffic conditions and related geophysical characteristics;
(3) Analysis of the effectiveness of the detection method, working methods and field work arrangements; (4) Estimation of workload and work progress;
(5) Labor organization, instruments, equipment and material plans; (6) Results and materials to be submitted;
(7) Existing problems and solutions.
Note: When the detection task is simple or the workload is small, the technical design can be simplified. 2.0.14 The computer underground pipeline mapping system and database shall meet the relevant technical requirements of this regulation.
2.0.15 Field operations for underground pipeline detection must comply with the relevant safety protection regulations in Appendix A of this regulation.
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3 Detection of Underground Pipelines
3.1 General Provisions
3.1.1 The detection of underground pipelines should ascertain the laying conditions of various underground pipelines and their projection positions and burial depths on the ground on site, and set pipeline point signs on the ground. 3.1.2 Pipeline points are divided into obvious pipeline points and concealed pipeline points. Field investigation and measurement of underground pipelines should be carried out at obvious pipeline points. Instruments should be used to detect the ground projection position and burial depth of underground pipelines at concealed pipeline points. 3.1.3 Pipeline points should be set at the characteristic points of the pipeline or its ground projection position. Pipeline characteristic points include intersections, branch points, turning points, starting and ending points, and the center points of ancillary facilities on the pipeline.
3.1.4 On pipeline sections without characteristic points, the distance between pipeline points for detecting various types of pipelines shall comply with the following provisions.
(1) For municipal public pipeline detection and special pipeline detection, the distance between pipeline points should be set at 15 to 30 cm on the corresponding scale topographic map; (2) For pipeline detection in factory areas or residential areas, the distance between pipeline points should be set at 10 to 20 cm on the corresponding scale topographic map; (3) For pipeline detection at construction sites, one pipeline point should be set every 510 m on site. 3.1.5 Underground pipeline exploration must be carried out on the basis of fully collecting and analyzing existing data, using a combination of field investigation and instrument exploration. 3.1.6 The numbering and marking of pipeline points should be represented by a symbol consisting of three parts: pipeline code, pipeline number and pipeline point sequence number. The pipeline code should be marked with Chinese phonetic letters according to Appendix D, and the pipeline number and pipeline point sequence number should be marked with Arabic numerals, with the symbol "-" added between them.
3.1.7 The selection criteria for underground pipeline detection should be determined according to the specific conditions of each city, the density of pipelines and the requirements of the client. The detection of municipal public pipelines should be selected according to Table 6 Engineering Quantity Standard Full-text Information System
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3.1.7.
Selection criteria for municipal public pipeline detection
Pipeline categories
Pipelines to be detected
Pipeline diameter>50mm or ≥100mm
Pipeline diameter≥200mm or ≥300mm
Pipeline diameter>50mm or ≥75mm
Underground pipeline detection should actively adopt new methods and technologies that have been proven to be effective through method tests and meet the accuracy requirements specified in Section 2.0.5.1 of this Code. 3.2 Field investigation
1 The underground pipelines and their ancillary facilities exposed at obvious pipeline points should be investigated, recorded and measured in detail, and the situation of each pipeline should be clarified. The pipeline point investigation form should be filled in according to the format of Appendix B. The items for field investigation of various underground pipelines can be selected according to Table 3.2.1.
It is advisable to invite personnel who are familiar with the underground pipelines in the area to participate in the field investigation. 3.2.2
During the field investigation, the nature and type of each pipeline should be found out. 3.2.3
3.2.3.1 Water supply pipelines can be divided into domestic water, production water and fire water according to the purpose of water supply.
Drainage pipelines can be divided into industrial wastewater, domestic sewage and rainwater according to the nature of drainage.
Gas pipelines can be divided into coal gas, liquefied gas and natural gas according to the properties of the gas they transmit; they can be divided into low pressure, medium pressure and high pressure according to the pressure of the gas pipeline: low pressure
pressure ≤<5kPa;
pressure>5kPa, <0.4MPa
pressure>0.4MPa, ≤1.6MPa.
Industrial pipelines can be divided into hydrogen, oxygen, ethylene according to the properties of the materials they transmit. 3.2.3.4
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KAONTKAca=1. The detection depth tolerance specified in the regulations. Mean error of analytical coordinates of detection pipeline points
Accuracy level
Mean error of coordinates m
±(5+0.02h)
±(5+0.035h)
±(5+0.055h)
Note, h is the central depth of the underground pipeline, in centimeters. 2.0.5.4
Table 2.0.5.3
The mean error of the measurement point on the underground pipeline map shall not be greater than ±0.5mm; the mean error of the detection point on the underground pipeline map shall not be greater than ±(0.5+0.25gts/Engineering Construction Standard Full-text Information System
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M) mm, where M is the denominator of the mapping scale. 2.0.6 The coordinate and elevation system used for municipal public pipeline detection and special pipeline detection must be consistent with the local city coordinate and elevation system. The local building coordinate system can be used for pipeline detection in factory areas or residential areas and pipeline detection at construction sites, but a conversion relationship should be established with the local city coordinate system. 2.0.7 The detection of underground pipelines should follow the following basic procedures: accepting tasks, collecting information, on-site investigation, method testing, compiling technical designs, field investigations, instrument detection, establishing measurement control, pipeline point connection measurement, underground pipeline map compilation, report writing and results acceptance. When detecting a single type of pipe or the workload is small, the above work procedures can be simplified.
2.0.8 The underground pipeline detection task should be issued by the superior department of the professional detection unit in the form of a task book, or commissioned by the user unit in the form of a letter of entrustment. The assignment or letter of entrustment should include the following: project name, location and scope of the work area, work purpose and accuracy level requirements, work deadline and results to be submitted, etc. 2.0.9 Before the on-site detection of underground pipelines, the existing underground pipeline data and relevant surveying and mapping data within the survey area must be fully collected and sorted out, which should include the following: (1) Existing maps of various underground pipelines:
(2) Design drawings, construction drawings, completion drawings and technical specifications of various pipelines; (3) Topographic maps of corresponding scales;
(4) Coordinates and elevations of the survey area and its adjacent survey control points. 2.0.10 On-site investigation should be carried out on the basis of collecting, sorting and analyzing existing data. The tasks of the investigation are:
(1) Verify the collected data and evaluate the credibility and availability of the data; (2) Inspect the ground features, landforms, transportation and underground pipeline distribution exposure, geophysical conditions and various possible interference factors in the work area; (3) Verify the location of the survey control points in the survey area. 2.0.11 Based on the data collection and field survey, a schematic diagram of underground pipeline detection should be prepared. The schematic diagram can be a 1:5000 or 1:10000 topographic map, or a topographic sketch. The detection range and the distribution of underground pipelines within and adjacent to the range should be marked on the map.
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2.0.12 Based on the collected data and the results of the field survey, reasonable underground pipeline detection methods and technologies should be selected, and necessary method tests should be carried out. The method test should comply with the provisions of Article 3.3.4 of this Code.
2.0.13 A technical design should be prepared for the underground pipeline detection project. The technical design should include the following contents:
(1) The purpose, tasks, scope and deadline of the detection work; (2) The topography of the work area, the overview of underground pipelines, traffic conditions and related geophysical characteristics;
(3) Analysis of the effectiveness of the detection method, working methods and field work arrangements; (4) Estimation of workload and work progress;
(5) Labor organization, instruments, equipment and material plans; (6) Results and materials to be submitted;
(7) Existing problems and solutions.
Note: When the detection task is simple or the workload is small, the technical design can be simplified. 2.0.14 The computer underground pipeline mapping system and database shall meet the relevant technical requirements of this regulation.
2.0.15 Field operations for underground pipeline detection must comply with the relevant safety protection regulations in Appendix A of this regulation.
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3 Detection of Underground Pipelines
3.1 General Provisions
3.1.1 The detection of underground pipelines should ascertain the laying conditions of various underground pipelines and their projection positions and burial depths on the ground on site, and set pipeline point signs on the ground. 3.1.2 Pipeline points are divided into obvious pipeline points and concealed pipeline points. Field investigation and measurement of underground pipelines should be carried out at obvious pipeline points. Instruments should be used to detect the ground projection position and burial depth of underground pipelines at concealed pipeline points. 3.1.3 Pipeline points should be set at the characteristic points of the pipeline or its ground projection position. Pipeline characteristic points include intersections, branch points, turning points, starting and ending points, and the center points of ancillary facilities on the pipeline.
3.1.4 On pipeline sections without characteristic points, the distance between pipeline points for detecting various types of pipelines shall comply with the following provisions.
(1) For municipal public pipeline detection and special pipeline detection, the distance between pipeline points should be set at 15 to 30 cm on the corresponding scale topographic map; (2) For pipeline detection in factory areas or residential areas, the distance between pipeline points should be set at 10 to 20 cm on the corresponding scale topographic map; (3) For pipeline detection at construction sites, one pipeline point should be set every 510 m on site. 3.1.5 Underground pipeline exploration must be carried out on the basis of fully collecting and analyzing existing data, using a combination of field investigation and instrument exploration. 3.1.6 The numbering and marking of pipeline points should be represented by a symbol consisting of three parts: pipeline code, pipeline number and pipeline point sequence number. The pipeline code should be marked with Chinese phonetic letters according to Appendix D, and the pipeline number and pipeline point sequence number should be marked with Arabic numerals, with the symbol "-" added between them.
3.1.7 The selection criteria for underground pipeline detection should be determined according to the specific conditions of each city, the density of pipelines and the requirements of the client. The detection of municipal public pipelines should be selected according to Table 6 Engineering Quantity Standard Full-text Information System
Engineering Construction Standard Full-text Information System
3.1.7.
Selection criteria for municipal public pipeline detection
Pipeline categories
Pipelines to be detected
Pipeline diameter>50mm or ≥100mm
Pipeline diameter≥200mm or ≥300mm
Pipeline diameter>50mm or ≥75mm
Underground pipeline detection should actively adopt new methods and technologies that have been proven to be effective through method tests and meet the accuracy requirements specified in Section 2.0.5.1 of this Code. 3.2 Field investigation
1 The underground pipelines and their ancillary facilities exposed at obvious pipeline points should be investigated, recorded and measured in detail, and the situation of each pipeline should be clarified. The pipeline point investigation form should be filled in according to the format of Appendix B. The items for field investigation of various underground pipelines can be selected according to Table 3.2.1.
It is advisable to invite personnel who are familiar with the underground pipelines in the area to participate in the field investigation. 3.2.2
During the field investigation, the nature and type of each pipeline should be found out. 3.2.3
3.2.3.1 Water supply pipelines can be divided into domestic water, production water and fire water according to the purpose of water supply.
Drainage pipelines can be divided into industrial wastewater, domestic sewage and rainwater according to the nature of drainage.
Gas pipelines can be divided into coal gas, liquefied gas and natural gas according to the properties of the gas they transmit; they can be divided into low pressure, medium pressure and high pressure according to the pressure of the gas pipeline: low pressure
pressure ≤<5kPa;
pressure>5kPa, <0.4MPa
pressure>0.4MPa, ≤1.6MPa.
Industrial pipelines can be divided into hydrogen, oxygen, ethylene according to the properties of the materials they transmit. 3.2.3.4
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KAONTKAca=6 The coordinate and elevation system used for municipal public pipeline detection and special pipeline detection must be consistent with the local city coordinate and elevation system. The local building coordinate system can be used for pipeline detection in factory areas or residential areas and pipeline detection at construction sites, but a conversion relationship should be established with the local city coordinate system. 2.0.7 The detection of underground pipelines should follow the following basic procedures: accepting tasks, collecting information, on-site investigation, method testing, compiling technical designs, field investigations, instrument detection, establishing measurement control, pipeline point connection measurement, underground pipeline map compilation, report writing and results acceptance. When detecting a single type of pipe or the workload is small, the above work procedures can be simplified.
2.0.8 The underground pipeline detection task should be issued by the superior department of the professional detection unit in the form of a task book, or commissioned by the user unit in the form of a letter of entrustment. The assignment or letter of entrustment should include the following: project name, location and scope of the work area, work purpose and accuracy level requirements, work deadline and results to be submitted, etc. 2.0.9 Before the on-site detection of underground pipelines, the existing underground pipeline data and relevant surveying and mapping data within the survey area must be fully collected and sorted out, which should include the following: (1) Existing maps of various underground pipelines:
(2) Design drawings, construction drawings, completion drawings and technical specifications of various pipelines; (3) Topographic maps of corresponding scales;
(4) Coordinates and elevations of the survey area and its adjacent survey control points. 2.0.10 On-site investigation should be carried out on the basis of collecting, sorting and analyzing existing data. The tasks of the investigation are:
(1) Verify the collected data and evaluate the credibility and availability of the data; (2) Inspect the ground features, landforms, transportation and underground pipeline distribution exposure, geophysical conditions and various possible interference factors in the work area; (3) Verify the location of the survey control points in the survey area. 2.0.11 Based on the data collection and field survey, a schematic diagram of underground pipeline detection should be prepared. The schematic diagram can be a 1:5000 or 1:10000 topographic map, or a topographic sketch. The detection range and the distribution of underground pipelines within and adjacent to the range should be marked on the map.
Engineering 4 Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
2.0.12 Based on the collected data and the results of the field survey, reasonable underground pipeline detection methods and technologies should be selected, and necessary method tests should be carried out. The method test should comply with the provisions of Article 3.3.4 of this Code.
2.0.13 A technical design should be prepared for the underground pipeline detection project. The technical design should include the following contents:
(1) The purpose, tasks, scope and deadline of the detection work; (2) The topography of the work area, the overview of underground pipelines, traffic conditions and related geophysical characteristics;
(3) Analysis of the effectiveness of the detection method, working methods and field work arrangements; (4) Estimation of workload and work progress;
(5) Labor organization, instruments, equipment and material plans; (6) Results and materials to be submitted;
(7) Existing problems and solutions.
Note: When the detection task is simple or the workload is small, the technical design can be simplified. 2.0.14 The computer underground pipeline mapping system and database shall meet the relevant technical requirements of this regulation.
2.0.15 Field operations for underground pipeline detection must comply with the relevant safety protection regulations in Appendix A of this regulation.
Engineering Construction Standard Full Text Information System
TKAONTKAca-
Engineering Construction Standard Full Text Information System
3 Detection of Underground Pipelines
3.1 General Provisions
3.1.1 The detection of underground pipelines should ascertain the laying conditions of various underground pipelines and their projection positions and burial depths on the ground on site, and set pipeline point signs on the ground. 3.1.2 Pipeline points are divided into obvious pipeline points and concealed pipeline points. Field investigation and measurement of underground pipelines should be carried out at obvious pipeline points. Instruments should be used to detect the ground projection position and burial depth of underground pipelines at concealed pipeline points. 3.1.3 Pipeline points should be set at the characteristic points of the pipeline or its ground projection position. Pipeline characteristic points include intersections, branch points, turning points, starting and ending points, and the center points of ancillary facilities on the pipeline.
3.1.4 On pipeline sections without characteristic points, the distance between pipeline points for detecting various types of pipelines shall comply with the following provisions.
(1) For municipal public pipeline detection and special pipeline detection, the distance between pipeline points should be set at 15 to 30 cm on the corresponding scale topographic map; (2) For pipeline detection in factory areas or residential areas, the distance between pipeline points should be set at 10 to 20 cm on the corresponding scale topographic map; (3) For pipeline detection at construction sites, one pipeline point should be set every 510 m on site. 3.1.5 Underground pipeline exploration must be carried out on the basis of fully collecting and analyzing existing data, using a combination of field investigation and instrument exploration. 3.1.6 The numbering and marking of pipeline points should be represented by a symbol consisting of three parts: pipeline code, pipeline number and pipeline point sequence number. The pipeline code should be marked with Chinese phonetic letters according to Appendix D, and the pipeline number and pipeline point sequence number should be marked with Arabic numerals, with the symbol "-" added between them.
3.1.7 The selection criteria for underground pipeline detection should be determined according to the specific conditions of each city, the density of pipelines and the requirements of the client. The detection of municipal public pipelines should be selected according to Table 6 Engineering Quantity Standard Full-text Information System
Engineering Construction Standard Full-text Information System
3.1.7.
Selection criteria for municipal public pipeline detection
Pipeline categories
Pipelines to be detected
Pipeline diameter>50mm or ≥100mm
Pipeline diameter≥200mm or ≥300mm
Pipeline diameter>50mm or ≥75mm
Underground pipeline detection should actively adopt new methods and technologies that have been proven to be effective through method tests and meet the accuracy requirements specified in Section 2.0.5.1 of this Code. 3.2 Field investigation
1 The underground pipelines and their ancillary facilities exposed at obvious pipeline points should be investigated, recorded and measured in detail, and the situation of each pipeline should be clarified. The pipeline point investigation form should be filled in according to the format of Appendix B. The items for field investigation of various underground pipelines can be selected according to Table 3.2.1.
It is advisable to invite personnel who are familiar with the underground pipelines in the area to participate in the field investigation. 3.2.2
During the field investigation, the nature and type of each pipeline should be found out. 3.2.3
3.2.3.1 Water supply pipelines can be divided into domestic water, production water and fire water according to the purpose of water supply.
Drainage pipelines can be divided into industrial wastewater, domestic sewage and rainwater according to the nature of drainage.
Gas pipelines can be divided into coal gas, liquefied gas and natural gas according to the properties of the gas they transmit; they can be divided into low pressure, medium pressure and high pressure according to the pressure of the gas pipeline: low pressure
pressure ≤<5kPa;
pressure>5kPa, <0.4MPa
pressure>0.4MPa, ≤1.6MPa.
Industrial pipelines can be divided into hydrogen, oxygen, ethylene according to the properties of the materials they transmit. 3.2.3.4
Engineering Construction Standard Full Text Information System
KAONTKAca=6 The coordinate and elevation system used for municipal public pipeline detection and special pipeline detection must be consistent with the local city coordinate and elevation system. The local building coordinate system can be used for pipeline detection in factory areas or residential areas and pipeline detection at construction sites, but a conversion relationship should be established with the local city coordinate system. 2.0.7 The detection of underground pipelines should follow the following basic procedures: accepting tasks, collecting information, on-site investigation, method testing, compiling technical designs, field investigations, instrument detection, establishing measurement control, pipeline point connection measurement, underground pipeline map compilation, report writing and results acceptance. When detecting a single type of pipe or the workload is small, the above work procedures can be simplified.
2.0.8 The underground pipeline detection task should be issued by the superior department of the professional detection unit in the form of a task book, or commissioned by the user unit in the form of a letter of entrustment. The assignment or letter of entrustment should include the following: project name, location and scope of the work area, work purpose and accuracy level requirements, work deadline and results to be submitted, etc. 2.0.9 Before the on-site detection of underground pipelines, the existing underground pipeline data and relevant surveying and mapping data within the survey area must be fully collected and sorted out, which should include the following: (1) Existing maps of various underground pipelines:
(2) Design drawings, construction drawings, completion drawings and technical specifications of various pipelines; (3) Topographic maps of corresponding scales;
(4) Coordinates and elevations of the survey area and its adjacent survey control points. 2.0.10 On-site investigation should be carried out on the basis of collecting, sorting and analyzing existing data. The tasks of the investigation are:
(1) Verify the collected data and evaluate the credibility and availability of the data; (2) Inspect the ground features, landforms, transportation and underground pipeline distribution exposure, geophysical conditions and various possible interference factors in the work area; (3) Verify the location of the survey control points in the survey area. 2.0.11 Based on the data collection and field survey, a schematic diagram of underground pipeline detection should be prepared. The schematic diagram can be a 1:5000 or 1:10000 topographic map, or a topographic sketch. The detection range and the distribution of underground pipelines within and adjacent to the range should be marked on the map.
Engineering 4 Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
2.0.12 Based on the collected data and the results of the field survey, reasonable underground pipeline detection methods and technologies should be selected, and necessary method tests should be carried out. The method test should comply with the provisions of Article 3.3.4 of this Code.
2.0.13 A technical design should be prepared for the underground pipeline detection project. The technical design should include the following contents:
(1) The purpose, tasks, scope and deadline of the detection work; (2) The topography of the work area, the overview of underground pipelines, traffic conditions and related geophysical characteristics;
(3) Analysis of the effectiveness of the detection method, working methods and field work arrangements; (4) Estimation of workload and work progress;
(5) Labor organization, instruments, equipment and material plans; (6) Results and materials to be submitted;
(7) Existing problems and solutions.
Note: When the detection task is simple or the workload is small, the technical design can be simplified. 2.0.14 The computer underground pipeline mapping system and database shall meet the relevant technical requirements of this regulation.
2.0.15 Field operations for underground pipeline detection must comply with the relevant safety protection regulations in Appendix A of this regulation.
Engineering Construction Standard Full Text Information System
TKAONTKAca-
Engineering Construction Standard Full Text Information System
3 Detection of Underground Pipelines
3.1 General Provisions
3.1.1 The detection of underground pipelines should ascertain the laying conditions of various underground pipelines and their projection positions and burial depths on the ground on site, and set pipeline point signs on the ground. 3.1.2 Pipeline points are divided into obvious pipeline points and concealed pipeline points. Field investigation and measurement of underground pipelines should be carried out at obvious pipeline points. Instruments should be used to detect the ground projection position and burial depth of underground pipelines at concealed pipeline points. 3.1.3 Pipeline points should be set at the characteristic points of the pipeline or its ground projection position. Pipeline characteristic points include intersections, branch points, turning points, starting and ending points, and the center points of ancillary facilities on the pipeline.
3.1.4 On pipeline sections without characteristic points, the distance between pipeline points for detecting various types of pipelines shall comply with the following provisions.
(1) For municipal public pipeline detection and special pipeline detection, the distance between pipeline points should be set at 15 to 30 cm on the corresponding scale topographic map; (2) For pipeline detection in factory areas or residential areas, the distance between pipeline points should be set at 10 to 20 cm on the corresponding scale topographic map; (3) For pipeline detection at construction sites, one pipeline point should be set every 510 m on site. 3.1.5 Underground pipeline exploration must be carried out on the basis of fully collecting and analyzing existing data, using a combination of field investigation and instrument exploration. 3.1.6 The numbering and marking of pipeline points should be represented by a symbol consisting of three parts: pipeline code, pipeline number and pipeline point sequence number. The pipeline code should be marked with Chinese phonetic letters according to Appendix D, and the pipeline number and pipeline point sequence number should be marked with Arabic numerals, with the symbol "-" added between them.
3.1.7 The selection criteria for underground pipeline detection should be determined according to the specific conditions of each city, the density of pipelines and the requirements of the client. The detection of municipal public pipelines should be selected according to Table 6 Engineering Quantity Standard Full-text Information System
Engineering Construction Standard Full-text Information System
3.1.7.
Selection criteria for municipal public pipeline detection
Pipeline categories
Pipelines to be detected
Pipeline diameter>50mm or ≥100mm
Pipeline diameter≥200mm or ≥300mm
Pipeline diameter>50mm or ≥75mm
Underground pipeline detection should actively adopt new methods and technologies that have been proven to be effective through method tests and meet the accuracy requirements specified in Section 2.0.5.1 of this Code. 3.2 Field investigation
1 The underground pipelines and their ancillary facilities exposed at obvious pipeline points should be investigated, recorded and measured in detail, and the situation of each pipeline should be clarified. The pipeline point investigation form should be filled in according to the format of Appendix B. The items for field investigation of various underground pipelines can be selected according to Table 3.2.1.
It is advisable to invite personnel who are familiar with the underground pipelines in the area to participate in the field investigation. 3.2.2
During the field investigation, the nature and type of each pipeline should be found out. 3.2.3
3.2.3.1 Water supply pipelines can be divided into domestic water, production water and fire water according to the purpose of water supply.
Drainage pipelines can be divided into industrial wastewater, domestic sewage and rainwater according to the nature of drainage.
Gas pipelines can be divided into coal gas, liquefied gas and natural gas according to the properties of the gas they transmit; they can be divided into low pressure, medium pressure and high pressure according to the pressure of the gas pipeline: low pressure
pressure ≤<5kPa;
pressure>5kPa, <0.4MPa
pressure>0.4MPa, ≤1.6MPa.
Industrial pipelines can be divided into hydrogen, oxygen, ethylene according to the properties of the materials they transmit. 3.2.3.4
Engineering Construction Standard Full Text Information System
KAONTKAca=10 On-site investigation should be conducted on the basis of collecting, sorting and analyzing existing data. The tasks of the investigation are:
(1) Verify the collected data and evaluate the credibility and availability of the data; (2) Inspect the exposed conditions of the ground objects, landforms, transportation and underground pipeline distribution, geophysical conditions and various possible interference factors in the work area; (3) Verify the location of the measurement control points in the survey area. 2.0.11 On the basis of data collection and investigation, a schematic diagram of underground pipeline detection should be prepared. The schematic diagram can be a topographic map of 1:5000 or 1:10000, or a topographic sketch. The detection range and the distribution of underground pipelines within and adjacent to the range should be marked on the map.
Engineering 4 Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
2.0.12 Based on the collected data and the results of the investigation, reasonable underground pipeline detection methods and technologies should be selected, and necessary method tests should be carried out. The method test shall comply with the provisions of Article 3.3.4 of this Code.
2.0.13 A technical design shall be prepared for the underground pipeline detection project. The technical design should include the following contents:
(1) The purpose, tasks, scope and deadline of the detection work; (2) The topography of the work area, the overview of the underground pipelines, traffic conditions and related geophysical characteristics;
(3) Analysis of the effectiveness of the detection method, working methods and field work arrangements; (4) Estimation of workload and work progress;
(5) Labor organization, instruments, equipment, and material plans; (6) Results and materials to be submitted;
(7) Existing problems and solutions.
Note: When the detection task is simple or the workload is small, the technical design can be simplified. 2.0.14 The computer underground pipeline mapping system and database shall meet the relevant technical requirements of this Code.
2.0.15 Field operations for underground pipeline detection must comply with the relevant safety protection regulations in Appendix A of this Code.
Engineering Construction Standard Full Text Information System
TKAONTKAca-
Engineering Construction Standard Full Text Information System
3 Detection of Underground Pipelines
3.1 General Provisions
3.1.1 The detection of underground pipelines should ascertain the laying conditions of various underground pipelines and their projection positions and burial depths on the ground on site, and set pipeline point signs on the ground. 3.1.2 Pipeline points are divided into obvious pipeline points and concealed pipeline points. Field investigation and measurement of underground pipelines should be carried out at obvious pipeline points. Instruments should be used to detect the ground projection position and burial depth of underground pipelines at concealed pipeline points. 3.1.3 Pipeline points should be set at the characteristic points of the pipeline or its ground projection position. Pipeline characteristic points include intersections, branch points, turning points, starting and ending points, and the center points of ancillary facilities on the pipeline.
3.1.4 On pipeline sections without characteristic points, the distance between pipeline points for detecting various types of pipelines shall comply with the following provisions.
(1) For municipal public pipeline detection and special pipeline detection, the distance between pipeline points should be set at 15 to 30 cm on the corresponding scale topographic map; (2) For pipeline detection in factory areas or residential areas, the distance between pipeline points should be set at 10 to 20 cm on the corresponding scale topographic map; (3) For pipeline detection at construction sites, one pipeline point should be set every 510 m on site. 3.1.5 Underground pipeline exploration must be carried out on the basis of fully collecting and analyzing existing data, using a combination of field investigation and instrument exploration. 3.1.6 The numbering and marking of pipeline points should be represented by a symbol consisting of three parts: pipeline code, pipeline number and pipeline point sequence number. The pipeline code should be marked with Chinese phonetic letters according to Appendix D, and the pipeline number and pipeline point sequence number should be marked with Arabic numerals, with the symbol "-" added between them.
3.1.7 The selection criteria for underground pipeline detection should be determined according to the specific conditions of each city, the density of pipelines and the requirements of the client. The detection of municipal public pipelines should be selected according to Table 6 Engineering Quantity Standard Full-text Information System
Engineering Construction Standard Full-text Information System
3.1.7.
Selection criteria for municipal public pipeline detection
Pipeline categories
Pipelines to be detected
Pipeline diameter>50mm or ≥100mm
Pipeline diameter≥200mm or ≥300mm
Pipeline diameter>50mm or ≥75mm
Underground pipeline detection should actively adopt new methods and technologies that have been proven to be effective through method tests and meet the accuracy requirements specified in Section 2.0.5.1 of this Code. 3.2 Field investigation
1 The underground pipelines and their ancillary facilities exposed at obvious pipeline points should be investigated, recorded and measured in detail, and the situation of each pipeline should be clarified. The pipeline point investigation form should be filled in according to the format of Appendix B. The items for field investigation of various underground pipelines can be selected according to Table 3.2.1.
It is advisable to invite personnel who are familiar with the underground pipelines in the area to participate in the field investigation. 3.2.2
During the field investigation, the nature and type of each pipeline should be found out. 3.2.3
3.2.3.1 Water supply pipelines can be divided into domestic water, production water and fire water according to the purpose of water supply.
Drainage pipelines can be divided into industrial wastewater, domestic sewage and rainwater according to the nature of drainage.
Gas pipelines can be divided into coal gas, liquefied gas and natural gas according to the properties of the gas they transmit; they can be divided into low pressure, medium pressure and high pressure according to the pressure of the gas pipeline: low pressure
pressure ≤<5kPa;
pressure>5kPa, <0.4MPa
pressure>0.4MPa, ≤1.6MPa.
Industrial pipelines can be divided into hydrogen, oxygen, ethylene according to the properties of the materials they transmit. 3.2.3.4
Engineering Construction Standard Full Text Information System
KAONTKAca=10 On-site investigation should be conducted on the basis of collecting, sorting and analyzing existing data. The tasks of the investigation are:
(1) Verify the collected data and evaluate the credibility and availability of the data; (2) Inspect the exposed conditions of the ground objects, landforms, transportation and underground pipeline distribution, geophysical conditions and various possible interference factors in the work area; (3) Verify the location of the measurement control points in the survey area. 2.0.11 On the basis of data collection and investigation, a schematic diagram of underground pipeline detection should be prepared. The schematic diagram can be a topographic map of 1:5000 or 1:10000, or a topographic sketch. The detection range and the distribution of un
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