CJJ 38-1990 Urban Heating Pipeline Engineering Quality Inspection and Assessment Standard CJJ38-90 CJJ38-1990 Standard download decompression password: www.bzxz.net

Engineering Construction Standard Full-text Information System
Industry Standards of the People's Republic of China
Urban Heating Pipe Network Project
Quality Inspection and Evaluation Standards
38—90
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Industry Standards of the People's Republic of China
Urban Heating Pipe Network Project
Quality Inspection and Evaluation Standards
38—90
Editor: Beijing Municipal Engineering Bureau
Approving Department: Ministry of Construction of the People's Republic of China Effective Date: August 1, 1991
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Notice on the Release of the Industry Standard "Standard for Quality Inspection and Assessment of Urban Heating Pipe Network Projects" Construction Standard [1991] No. 5
Construction Committees (Construction Departments) of all provinces, autonomous regions, and municipalities directly under the Central Government, Construction Committees of independently planned cities, and relevant ministries and commissions of the State Council:
According to the requirements of the former Ministry of Urban and Rural Construction and Environmental Protection (87) Chengkezi No. 276, the "Standard for Quality Inspection and Assessment of Urban Heating Pipe Network Projects J38-90, since 1991" edited by the Beijing Municipal Engineering Bureau has been reviewed and approved as an industry standard with the number CJJ and implemented from August 1, 1991.
This standard is managed by the Ministry of Construction's Urban Construction Standards and Technology Management Unit, the Ministry of Construction's Urban Construction Research Institute, and its specific interpretation is the responsibility of the Beijing Municipal Engineering Bureau. This standard is organized and published by the Ministry of Construction's Standards and Norms Research Institute. Ministry of Construction of the People's Republic of China
January 4, 1991
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Engineering Construction Standards Full Text Information System
Chapter 1 General
Chapter 2
Chapter 3
Inspection and Assessment Methods and Grade Standards,
Civil Engineering·
Section 1 Grooves
Section 2 Formwork
Section 3
Section 4
Section 5
Section 6
Section 7
Section 8
Section 9 Section
Section 10
Chapter 4
Concrete cushion, foundation, structure
Brickwork structure·
Waterproof plastering·
Rolled waterproofing
Prefabrication and installation of reinforced concrete components
Backfill
Pipeline engineering
Section 1
Section 2
Section 3
Section 4
Section 5
Section 6
Section 7
Rust removal and oiling of steel pipes
Steel pipe installation
Steel pipe welding| |tt||Installation of equipment and accessories
Hydrostatic test
Pipeline insulation
Radiographic flaw detection of pipeline welds·
Chapter V Measurement
Appendix 1 Terminology comparison
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Appendix Examples of statistical calculations for engineering quality inspection and evaluationAppendix 3
Evaluation criteria for concrete strength acceptance
Appendix 4 Explanation of terms used in this standard
Additional instructions
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Chapter I General Provisions
Article 1.0.1 This standard is specially formulated to meet the needs of the development of urban heating pipe network engineering construction, unify the quality inspection methods and evaluation standards of urban heating pipe network engineering, improve the construction quality of urban heating pipe network engineering, and promote the quality management of urban heating pipe network engineering.
Article 1.0.2 This standard applies to newly built, expanded and rebuilt urban heating pipe network engineering. Urban heating pipe network engineering with special requirements shall be implemented in accordance with this standard except for the special requirements.
Urban heating pipe network engineering within industrial plant areas, urban heating pipe network engineering in remote suburbs and counties (banners) outside the urban area, can refer to this standard for implementation. Article 1.0.3 The quality inspection and assessment of urban heating pipe network projects, in addition to complying with this standard, shall also comply with the provisions of the relevant national standards in force. The quality standards of raw materials, semi-finished products or finished products shall also comply with the relevant national standards in force. Engineering Construction Standards Full-text Information System
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Chapter II Inspection and Assessment Methods and Grade Standards Article 2.0.1 The quality assessment of urban heating pipe network projects is divided into two grades: "qualified" and "excellent".
Article 2.0.2 Division of processes, parts and unit projects of urban heating pipe network projects:
1. Process:
The process is divided into:
1. Civil engineering processes such as trenches, formworks, steel bars, concrete (cushions, foundations, structures), brickwork structures, waterproof plastering, waterproofing rolls, installation of reinforced concrete prefabricated components, small rooms, backfilling, and jacking pipes.
2. Pipe installation, steel pipe welding, equipment and accessories installation, rust removal and oiling, pipeline insulation, water pressure test, non-destructive testing and other pipeline processes. 2. Parts:
It is not appropriate to divide urban heating pipe network projects into parts, but they can also be divided into several parts according to length.
3. Unit projects:
The independent accounting project of urban heating pipe network projects should be a unit project. The same pipe network project that adopts separate accounting in stages should be several unit projects. Article 2.0.3 Inspection and evaluation must be qualified after the appearance project inspection before the inspection of items with allowable deviations can be carried out.
Article 2.0.4 When conducting sampling inspection, the sampling points should reflect the actual situation of the project (where the inspection range is length, sampling should be carried out according to the specified interval, and the larger deviation points should be selected; other larger deviation points should be selected within the specified range). Article 2.0.5 The inspection and evaluation of the quality of urban heating pipe network projects shall be carried out at three levels: process, location and unit project. When the project is not divided into locations, it can be carried out at two levels: process and unit project. The main basis for the evaluation standard is the qualified rate: Engineering Construction Standard Full Text Information System
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The number of qualified points (groups) in the same inspection item is the number of required points () in the inspection item × 100% qualified rate:
I. Process:
Qualified: Those who meet the following requirements shall be evaluated as "qualified" 1. The qualified rate of major inspection items (listed in the project column) shall reach 100%.
2. The qualified rate of non-major inspection items shall reach 70%, and the maximum deviation of points that do not meet the requirements of this standard shall be within 1.5 times the allowable deviation. In special cases, if the maximum deviation exceeds 1.5 times the allowable deviation, but does not affect the construction of the next process, the structure and use function of the project, it can still be evaluated as qualified. Excellent: Those who meet the following requirements shall be rated as "excellent" 1. Meet the conditions of the qualified standards.
2. The average qualified rate of all inspection items shall reach 85%. 2. Parts:
Qualified: If all processes are qualified, the part shall be rated as "qualified". Excellent: On the basis of being evaluated as qualified, if the average qualified rate of all process inspection items reaches 85%, the part shall be rated as excellent. When evaluating parts, the template process does not participate in the evaluation. 3. Unit projects:
Qualified: If all processes of all parts are qualified, the unit project shall be rated as qualified.
Excellent: On the basis of being evaluated as qualified, if the average qualified rate of all parts (processes) inspection items reaches 85%, the unit project shall be rated as excellent. Article 2.0.6 If the quality of the process does not meet the requirements of this standard, it shall be handled in a timely manner. The quality level of the reworked project shall be re-evaluated. Projects that change the structural appearance or cause permanent defects (but do not affect the use effect) after reinforcement shall not be rated as excellent.
The quality inspection and assessment of urban heating pipeline network projects must comply with the following provisions in Article 2.0.7.
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Engineering Construction Standards Full Text Information System
1. Process handover inspection. The inspection personnel (full-time or part-time) shall conduct the T-sequence handover inspection, assess the process level, and fill in Table 2.0.7-1 (process handover inspection, conducted on the basis of self-inspection and mutual inspection by the construction team); part handover inspection. The inspection personnel shall conduct part handover inspection on the basis of the process handover inspection, assess the part level, and fill in Table 2.0.7-2; 3. Unit project handover inspection. The inspector shall conduct unit project handover inspection on the basis of the part or process handover inspection, assess the project quality level, and fill in Table 2.0.7-3.
Process quality
Quality evaluation table
Unit project name:
Main project quantity
Serial number inspection item
Handover team
Engineering technical person in charge:
Part name:
Process name:
Deviation of each measured point
Receiving team
Quality inspector:
Table 2.0.7-1
To be inspected
101112131415
Construction worker:
Average qualified rate (%)）
Evaluation level
Year/month/day
Qualified rate
Note: The actual number of inspection points shall not be greater than the number of inspection points that should be inspected. If it exceeds the number of inspection points that should be inspected, the excess points shall be subtracted from the qualified points. Www.bzxZ.net
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Unit project name:
Process name
Average qualified rate (%)
Detailed opinion
Engineering technical person in charge:
Quality inspector:
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Part name:
Qualified rate
Evaluation level
Construction worker:
Quality level
Table 2.0.7-2
Year, month, day
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Project name:
Construction Work team:
Name of part (process)
Average qualified rate (%)
Evaluation opinion
Project technical person in charge:
Quality inspector:
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Qualified rate (%)
Evaluation level
Construction worker:
Quality level
Table 2.0.7-3
Construction unit:
Design unit:
Construction unit:
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Chapter 3 Civil Engineering
Section 1 Trench
Article 3.1.1 It is strictly forbidden to disturb the soil at the bottom of the trench. If disturbance and over-excavation occur, it is strictly forbidden to backfill with soil.
Article 3.1.2
The bottom of the trench shall not be soaked in water or frozen.
The allowable deviation of the trench shall comply with the provisions of Table 3.1.3. Article 3.1.3
Allowable deviation of the trench
Each side of the center line
Trench bottom width
Trench side slope
Additional allowable deviation
With trench
Without trench
Not less than the specified
Not higher than the specified
Inspection frequency
Range (m)
Inspection method
Measure with a ruler on the elevation line
Or measure with a level
Measure with a ruler on the center line,
Not counting points
Inspect with a slope gauge, not counting points
Note: ① In the section where the trench bottom is paved with a sand and gravel cushion layer, the trench bottom elevation refers to the elevation of the top surface of the sand and gravel cushion layer. ② The groove slope is not allowed to have obvious bumps. Section 2 Formwork
Article 3.2.1
The formwork must be installed firmly, the size inside the formwork is accurate, and the wood chips and other debris inside the formwork should be cleaned up.
Article 3.2.2 The formwork joints must be tight and no leakage should occur when pouring concrete. Engineering Construction Standard Full Text Information System
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