Code for construction and acceptance of municipal drainage pipeline engineering

1.0. 1 This specification is formulated to strengthen the construction management of water supply and drainage (hereinafter referred to as water supply and drainage) pipeline engineering, standardize the construction technology, unify the construction quality inspection and acceptance standards, and ensure the engineering quality.

1.0. 1 code for construction and acceptance of water supply and drainage pipelines (GB 50268-97) was promulgated and implemented 1 1 year, which has played a positive role in the construction of water supply and drainage pipelines in China. In recent years, with the rapid development of national economy and urban construction, the improvement of water supply and drainage pipeline engineering technology, the renewal of construction machinery and equipment, and the development of pipe varieties and structures, the contents of the original Code can no longer meet the needs of current water supply and drainage pipeline engineering construction and construction. In order to standardize the construction technology, unify the inspection and acceptance standards of construction quality and ensure the engineering quality; In particular, the original Code was revised, and the contents of the Standard for Quality Inspection and Evaluation of Municipal Drainage Pipeline Engineering CJJ3 were incorporated into the Code for Construction and Acceptance of Water Supply and Drainage Pipeline Engineering.

The revised Code for Construction and Acceptance of Water Supply and Drainage Pipeline Engineering (hereinafter referred to as the Code) is positioned as a general standard to guide the construction and acceptance of water supply and drainage pipeline engineering in various regions of the country. It is necessary to clarify the requirements of construction (including technology, quality and safety) and make specific provisions on the division of engineering projects, inspection and acceptance standards and organizational procedures.

1.0.2 this specification is applicable to the construction and acceptance of newly built, expanded and rebuilt urban public facilities and outdoor water supply and drainage pipeline projects of industrial enterprises; It is not applicable to the construction and acceptance of water supply and drainage pipelines with special requirements in industrial enterprises.

1.0.2 This specification is applicable to water supply and drainage pipeline engineering outside buildings, and mainly specifies the construction requirements and acceptance criteria of slotted pipelines, pipelines without slotted construction, bridge pipelines, immersed pipelines and their ancillary structures commonly used in towns and industrial areas.

1.0.3 varieties, specifications and performance of raw materials, semi-finished products and finished products used in water supply and drainage pipeline engineering must comply with relevant national standards and design requirements; Products that come into contact with drinking water must meet the relevant hygiene requirements. It is strictly forbidden to use products explicitly eliminated or prohibited by the state.

1.0.3 This article is mandatory. There are many kinds of materials such as pipes and fittings used in water supply and drainage pipeline engineering, and the product specifications are not uniform. Product quality will directly affect the safe use function and environmental protection of engineering structures. Therefore, materials such as pipes and fittings must meet the relevant national product standards. In order to protect people's health, supply drinking water pipes. Hygienic performance must conform to the national standard "Safety Evaluation Standard for Drinking Water Transmission and Distribution Equipment and Protective Materials" GB/T 172 19. This specification advocates the application of new materials, new technologies and new processes, and it is strictly forbidden to use products explicitly eliminated or prohibited by the state.

1.0.4 the construction and acceptance of water supply and drainage pipeline engineering shall conform to the provisions of the current national standards in addition to this specification.

1.0.4 The construction and construction of the drainage pipeline project must comply with the national laws and regulations. When the project has specific requirements, which are not specified in this specification, the relevant national codes and standards shall be implemented, or the construction, design, construction, supervision and other relevant parties shall negotiate to solve them.

The relevant national codes, regulations and standards cited in this specification are current and effective, and the numbers are given in the provisions, which is convenient to find when using.

2 terminology

2.0. 1 pressure pipeline

This specification refers to water supply and drainage pipelines with working pressure greater than or equal to 0. 1MPa.

2.0. 1 Pressure pipeline is defined as a water supply and drainage pipeline in which the medium transported in the pipeline runs under pressure, and the working pressure is greater than or equal to 0. 1MPa, thus defining pressure pipeline and pressureless pipeline.

2.0.2 Non-pressure pipeline

This specification refers to the water supply and drainage pipeline with working pressure less than 0. 1MPa. Rigid pipe

The pipeline which mainly depends on the strength of the pipe to support the external force has little deformation under the external load, and the failure of the pipeline is due to the control of the strength of the pipe wall. This specification refers to reinforced concrete, prestressed (self-stressing) concrete pipes and prestressed steel cylinder concrete pipes.

2.0.3 ~ 2.0.6 For the terms of rigid pipe, flexible pipe, rigid interface and flexible interface, see CECS 83: 96 "General Terms of Pipeline Engineering Structure" and "Code for Design of Pipeline Structure of Water Supply and Drainage Engineering" GB 50332—2002；; ; In structural design, the difference between flexible pipeline and rigid pipeline is mainly to consider or not to consider the elastic resistance of the pipeline and the soil around the pipeline under load. The failure of flexible pipeline is usually caused by excessive circumferential deformation of pipeline, so the requirements for foundation treatment and backfilling are different in engineering construction.

Flexible pipeline

For the pipeline with obvious deformation under external load, the vertical load is mostly balanced by the elastic resistance generated by the soil on both sides of the pipeline, and the failure of the pipeline is usually caused by deformation rather than the destruction of the pipe wall. This specification mainly refers to steel pipes, chemical building materials pipes and ductile iron pipes with flexible interfaces.

2.0.3 ~ 2.0.6 For the terms of rigid pipe, flexible pipe, rigid interface and flexible interface, see CECS 83: 96 "General Terms of Pipeline Engineering Structure" and "Code for Design of Pipeline Structure of Water Supply and Drainage Engineering" GB 50332—2002；; ; In structural design, the difference between flexible pipeline and rigid pipeline is mainly to consider or not to consider the elastic resistance of the pipeline and the soil around the pipeline under load. The failure of flexible pipeline is usually caused by excessive circumferential deformation of pipeline, so the requirements for foundation treatment and backfilling are different in engineering construction.

2.0.5 rigid interface rigid interface

Pipe joints that cannot bear a certain amount of axial linear displacement and relative angular displacement, such as pipe joints sealed with cement materials or connected with flanges.

2.0.3 ~ 2.0.6 For the terms of rigid pipe, flexible pipe, rigid interface and flexible interface, see CECS 83: 96 "General Terms of Pipeline Engineering Structure" and "Code for Design of Pipeline Structure of Water Supply and Drainage Engineering" GB 50332—2002；; ; In structural design, the difference between flexible pipeline and rigid pipeline is mainly to consider or not to consider the elastic resistance of the pipeline and the soil around the pipeline under load. The failure of flexible pipeline is usually caused by excessive circumferential deformation of pipeline, so the requirements for foundation treatment and backfilling are different in engineering construction.

2.0.6 Flexible interface

A pipe joint that can bear a certain amount of axial linear displacement and relative angular displacement, such as a pipe joint sealed with rubber ring and other materials.

2.0.3 ~ 2.0.6 For the terms of rigid pipe, flexible pipe, rigid interface and flexible interface, see CECS 83: 96 "General Terms of Pipeline Engineering Structure" and "Code for Design of Pipeline Structure of Water Supply and Drainage Engineering" GB 50332—2002；; ; In structural design, the difference between flexible pipeline and rigid pipeline is mainly to consider or not to consider the elastic resistance of the pipeline and the soil around the pipeline under load. The failure of flexible pipeline is usually caused by excessive circumferential deformation of pipeline, so the requirements for foundation treatment and backfilling in engineering construction are different.

2.0.7 chemical materials pipeline for chemical building materials pipeline

This specification refers to glass fiber pipes or glass fiber reinforced thermosetting plastic pipes (referred to as glass steel pipes), rigid polyvinyl chloride pipes (UPVC), polyethylene pipes (PE), polypropylene pipes (PP) and their steel-plastic composite pipes.

2.0.7 The term chemical (also called chemical) building materials pipeline refers to GB50332—2002, which refers to pipes with similar construction and installation methods, such as rigid polyvinyl chloride pipes (UPVC), polyethylene pipes (HDPE), glass fiber pipes or glass fiber reinforced thermosetting plastic pipes (FRP) and steel-plastic composite pipes, and does not involve other categories. For the convenience of engineering application, glass fiber pipe or glass fiber reinforced thermosetting plastic pipe is called "glass steel pipe" for short.

2.0.8 Canal; ; Ditch; channel

Refers to the rectangular, arched and other special-shaped (non-circular) cross-section water conveyance channels built with brick, stone and concrete blocks, cast-in-place with reinforced concrete or assembled with reinforced concrete prefabricated members. 2.0.9 Grooving installation for grooving construction

Construction method of digging trenches from the surface and laying pipelines (canals) in the trenches.

Trenchless installation

Construction methods for laying or pouring pipelines (canals) in holes formed by underground excavation of pipelines include pipe jacking method, shield method, shallow buried excavation method, directional drilling method, pipe tamping method, etc. 2.0. 1 1 pipeline cross treatment

Refers to the necessary construction treatment to ensure the construction safety and the operation safety of the existing pipeline when the construction pipeline crosses or approaches the existing pipeline. 2.0. 12 pipe jacking method

The jacking construction method of underground pipeline is to jack the prefabricated pipe joint into the soil without slotting with the help of jacking device. 2.0. 13 shielding method

A trenchless construction method of constructing underground pipelines by assembling prefabricated segments or cast-in-place concrete while tunneling in the stratum with a shield machine. 2.0. 14 shallow-buried excavation method

In the process of excavation, the self-stabilizing ability of soil layer in a short time is utilized, and appropriate supporting measures are taken to form a thin-walled supporting structure on the surface of surrounding rock or soil layer. 2.0. 15 directional drilling method

A non-slotting construction method of drilling a small-diameter pilot hole with a horizontal drilling rig, then reaming with a back-expanding bit and pulling the pipeline into the hole. 2.0. 16 pipeline measurement method

Construction method of underground pipeline by ramming pipe joint into stratum without slotting with pipe rammer (pneumatic rammer). 2 . 0 . 17 sunkenpipelinemethod； ; Immersed pipeline method

Underwater pipeline laying method, in which the assembled pipe section or reinforced concrete sealed pipe section is sunk into the bottom of the water or the trench excavated at the bottom of the water, is also called immersed pipe method or prefabricated pipe section immersed pipe method.

2.0. 17 pipe sinking methods mainly include: floating transportation method (or floating paving method) refers to the construction method that the pipeline sinks after floating (dragging) on the water surface; Bottom dragging method (or traction laying method) refers to the construction method of dragging the pipeline from the bottom of the water into the trench; Pipe-laying ship method refers to the construction method that the pipeline is sent on the ship and sank along the designated route through the ship.

2.0. 18 bridge pipe method

Special pipeline laying method for crossing rivers, lakes, sea areas, railways, highways, valleys and other natural or artificial obstacles in the form of bridges. 2.0. 19 working shaft

When non-slotting construction methods such as pipe jacking, shield tunneling and shallow excavation are adopted, auxiliary passages from the ground to the bottom of the pipeline are vertically excavated, which are also called working pits and shafts. Pipeline leakage test

General term for testing leakage of laid pipelines with liquid or gas.

2.0.20—2.0.23 Functional tests of water supply and drainage pipelines include pipeline leakage test (1eaktest) and pipeline water pressure test (water pressure test). Pipeline tightness test shall include water tightness test and air tightness test. This specification gives the terminology explanations of water pressure test, closed water test and closed air test respectively.

Other terms are given meanings from the practical application perspective of engineering practice, referring to the terms in Basic Terminology Standard for Water Supply and Drainage Design (GBJ 125), General Terminology for Pipeline Engineering Structure (CECS 83: 96) and related standards and specifications, but the meanings are not necessarily the definitions of terms. At the same time, it also gives the corresponding recommended English terms, not necessarily international standard terms, for reference only.

2.0.2 1 hydrostatic test of pressure pipeline

With water as the medium, the laid pressure pipeline is pressurized after being filled with water, so as to check whether the pipeline has structural damage under the specified pressure value and whether it meets the specified allowable water seepage (or allowable pressure drop) standard. 2.0.22 Watertightness test of pressureless pipeline

Leakage test of gravity flow pipeline (canal) with water as medium. 2.0.23 Air tightness test of pressureless pipeline Air pressure test of pressureless pipeline

Leak test of pipeline laying with gas as medium.

2.0.20—2.0.23 Functional tests of water supply and drainage pipelines include pipeline leakage test (1eaktest) and pipeline water pressure test (water pressure test). Pipeline tightness test shall include water tightness test and air tightness test. This specification gives the terminology explanations of water pressure test, closed water test and closed air test respectively.

Other terms are given meanings from the practical application perspective of engineering practice, referring to the terms in Basic Terminology Standard for Water Supply and Drainage Design (GBJ 125), General Terminology for Pipeline Engineering Structure (CECS 83: 96) and related standards and specifications, but the meanings are not necessarily the definitions of terms. At the same time, it also gives the corresponding recommended English terms, not necessarily international standard terms, for reference only.

3 Basic clauses 3. 1 Basic clauses for construction

3. 1. 1 The construction unit engaged in water supply and drainage pipeline engineering should have corresponding construction qualifications, and the construction personnel should have corresponding qualifications. The construction and quality management of water supply and drainage pipeline engineering should have corresponding construction technical standards.

3. 1. 1 The construction unit engaged in water supply and drainage pipeline engineering specified in this article shall have corresponding construction qualifications, and the construction personnel shall have corresponding qualifications; Water supply and drainage pipeline engineering construction and quality management should have corresponding construction technical standards; These are the basic provisions of engineering construction management and quality control.

3. 1.2 The construction unit shall establish and improve the management system of construction technology, quality and safety production, formulate and implement various construction management regulations.

3. 1.3 the construction unit shall, in accordance with the requirements of contract documents, design documents and relevant specifications and standards, and according to the information of underground pipelines, engineering hydrogeology and other buildings (structures) provided by the construction unit, organize relevant construction technical management personnel to conduct in-depth investigation along the line, grasp the actual situation on site, and make good preparations for construction.

3. 1.3 according to the characteristics of water supply and drainage pipeline construction, this article emphasizes the investigation of the site and surrounding environment before construction, so as to understand and master the real information of underground pipelines and other buildings. It is based on the experience and lessons of engineering practice in recent years.

3. 1.4 The construction unit shall be familiar with and review the construction drawings, master the design intent and requirements, and implement the system of self-examination, joint examination (disclosure) and visa: when any doubt or mistake is found in the construction drawings, it shall promptly put forward opinions and suggestions; If it is really necessary to change the design, it should be submitted for approval according to the corresponding procedures and implemented after the visa confirmation of the relevant units.

3. 1.4 The system of self-examination, joint examination (disclosure) and visa should be implemented in engineering construction projects, which is an important link in engineering construction preparation; When the construction drawing is found to be in doubt or wrong, opinions and suggestions should be put forward in time; If it is really necessary to change the design, it should be submitted for approval according to the corresponding procedures and implemented after the visa confirmation of the relevant units.

3. 1.5 The construction unit shall prepare the construction organization design before the commencement of construction, and prepare the special construction plans for key disciplines and sub-projects respectively. The construction organization design and special construction scheme must be implemented after examination and approval according to the prescribed procedures. If there is any change, the change approval shall be handled.

3. 1.5 This article is a mandatory provision, which stipulates the construction organization design, the preparation and examination and approval procedures of the construction scheme. The core of construction organization design is the construction scheme, and this specification focuses on making specific provisions on the construction scheme; For the approval procedures of construction organization design and construction scheme, all localities and industries have regulations, so don't ask. This specification should not make uniform provisions, but should emphasize its content requirements, and be implemented after being submitted for approval according to the "prescribed procedures".

3. 1.6 Temporary facilities for construction shall be set reasonably according to the characteristics of the project, and there shall be an overall layout plan. For projects that are not suitable for intermittent construction, there should be standby power supply and equipment. 3. 1.7 The construction survey shall be carried out with the recheck system of the construction unit and the retest system of the supervision unit, and relevant records shall be filled in, which shall meet the following requirements: 1 Before the construction, the construction unit shall organize relevant units to hand in the piles on site, and the construction unit shall conduct recheck measurement on the handed-in piles; When the original pile is lost or displaced, it should be corrected in time and confirmed by the corresponding technical quality management department and personnel; 2 Temporary leveling points and pipeline axis control piles should be set in places that are easy to observe, not easily disturbed and must be firm, and protective measures should be taken; Temporary leveling points along the slotted pipeline shall be no less than1every 200m; 3 Temporary leveling points, pipe axis control piles and elevation piles must be checked before use, and often checked; 4. Temporary leveling points and pipe axis control piles for construction pipelines, immersed pipes, bridge pipes and other projects that are not slotted shall be set according to the construction plan and checked in time; 5 Before construction, the plane position and elevation of the joint between existing pipelines and structures and the proposed project must be corrected.

3. 1.7 and 3. 1.8 are construction survey clauses, and the original Code is listed as construction preparation contents. This revision does not add more contents, mainly considering the specific provisions of the current Code for Engineering Survey (GB50026) and Code for Urban Survey (CJJ8) in construction survey, and only lists the basic professional provisions. 3. 1.8 The allowable deviation of construction survey shall comply with the provisions of Table 3. 1.8, and shall comply with the relevant provisions of the current national standards "Code for Engineering Survey" GB50026 and "Code for Urban Survey" CJJ8; For pipelines with special requirements, special regulations should also be observed.

3. 1.7 and 3. 1.8 are construction survey clauses, and the original Code is listed as construction preparation contents. This revision does not add more contents, mainly considering the specific provisions of the current Code for Engineering Survey (GB50026) and Code for Urban Survey (CJJ8) in construction survey, and only lists the basic professional provisions. 3. 1.9 products such as pipes, fittings, components (fittings) and main raw materials used in the project must be accepted and properly kept when they enter the construction site. When entering the site for acceptance, the ordering contract, quality certificate, performance inspection report, instruction manual, commodity inspection report and certificate of import products of each batch of products shall be checked, and re-inspection shall be carried out according to relevant national standards, and they can be used only after passing the inspection.

3. 1.9 This article is a mandatory provision, stipulating that products such as pipes, pipe fittings, components (fittings) and main raw materials used in the project should be subject to the system of entry acceptance and reinspection, and can only be used after passing the acceptance.

3. 1. 10 The engineering materials such as concrete, mortar, anti-corrosion and waterproof coating prepared on site shall be inspected before use.

3. 1. 1 1 Pipe joints, semi-finished products and components (fittings) used in transportation, storage and construction must take effective measures to prevent them from being damaged, corroded or deteriorated. 3. 1. 12 The construction unit must abide by the laws and regulations of the state and local governments on environmental protection and take effective measures to control the pollution and harm of dust, waste gas, waste, noise and vibration on the construction site. 3. 1. 13 The construction unit must obtain a safety production license, abide by laws and regulations on construction safety, labor protection, fire prevention and gas protection, establish a safety management system and a responsibility system for production safety, and ensure safe construction. For special operations such as trenchless construction, river-crossing pipelines or deep foundation pits, special construction schemes should be formulated.

3. 1. 13 According to the relevant regulations of the Ministry of Housing and Urban-Rural Development, the construction unit must obtain a safety production license; Special construction plans should be made for sub-projects and special operations with high safety risks.

3. 1. 14 Measuring instruments and testing equipment used in quality inspection and acceptance can only be used after metrological verification and calibration. The unit undertaking the testing of materials and equipment shall have corresponding qualifications. 3. 1. 15 The construction quality control of water supply and drainage pipeline engineering shall meet the following requirements:

1 Each subdivisional work shall be subject to quality control according to construction technical standards, and each subdivisional work shall be inspected after completion; 2 Between related subdivisional work, handover inspection must be carried out, all concealed subdivisional work must be concealed and accepted, and the next subdivisional work shall not be carried out without inspection or unqualified acceptance.

3. 1. 15 This article is mandatory. The basic provisions of quality control of water supply and drainage pipeline construction are given:

Paragraph 1 emphasizes that all subdivisional works should be controlled according to construction technical standards, and checked (self-checked) after completion. Paragraph 2 emphasizes that handover inspection (mutual inspection) should be carried out between subdivisional work, and all concealed subdivisional work should be concealed for acceptance. It is stipulated that no subsequent subdivisional work or next working procedure shall be carried out without inspection or unqualified acceptance. The concepts of subdivisional work and working procedure should be different. A subdivisional work consists of one or several working procedures and should not be regarded as used.