CJJ/T 29-1998 Technical specification for building drainage rigid polyvinyl chloride pipe engineering
Some standard content:
Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Building Drainage Rigid Polyvinyl Chloride Pipe Engineering
Technical Specification
Technical Specification of PVC-UPipe Work for Building DrainageCJJ/T29—98
1998Beijing
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Building Drainage Rigid Polyvinyl Chloride Pipe Engineering
Technical Specification
Technical Specification of PVC-UPipe Work for Building DrainageCJJ/T29—98
Editor: Shanghai Architectural Design InstituteApproval department: Ministry of Construction of the People's Republic of ChinaImplementation date: April 1, 1999
BBeijing
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About the release of industry standards
"Building Drainage Rigid Polyvinyl Chloride
Pipeline Engineering Technology According to the requirements of the Ministry of Construction's "Notice on Issuing the 1995 Urban Construction and Construction Engineering Industry Standard Development and Revision Project Plan (First Batch)" (Jianbiao [1995] No. 175), the "Technical Specifications for Building Drainage Rigid Polyvinyl Chloride Pipe Engineering" edited by the Shanghai Architectural Design Institute: After review, it was approved as a recommended industry standard, numbered CJJ/T29-98, and will be implemented on April 1, 1999. The original industry standards "Design Specifications for Building Drainage Rigid Polyvinyl Chloride Pipe" (CJJ29-89) and "Construction and Acceptance Specifications for Building Drainage Rigid Polyvinyl Chloride Pipe" (CJJ30-89) are abolished at the same time. This standard is managed by the Ministry of Construction's Urban Construction Standards and Technology Management Unit, and the Shanghai Architectural Design Institute is responsible for the specific interpretation. This standard is published by the China Building Industry Press organized by the Standard and Quota Research Institute of the Ministry of Construction.
Ministry of Construction of the People's Republic of China
October 12, 1998
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Engineering Construction Standards Full Text Information System
According to the requirements of Document No. 175 of the Ministry of Construction (1995), the code compilation group has revised the original industry standards "Design Code for Rigid Polyvinyl Chloride Pipes for Building Drainage" (CJJ29-89) and "Construction and Acceptance Code for Rigid Polyvinyl Chloride Pipes for Building Drainage" (CJJ30-89) on the basis of extensive investigation and research, careful summary of practical experience and absorption of scientific research results, and extensive solicitation of opinions.
The main technical contents of this code are: 1. Scope of application; 2. Pipeline layout and laying; 3. Pipeline hydraulic calculation; 4. Pipeline bonding technology; 5. Installation and construction requirements for vertical pipes, horizontal pipes and buried pipes on floors, 6. Construction acceptance. The main technical contents of the revision are: 1. 1. Added the layout method that pipes can be set on the outer wall in areas with higher temperatures; 2. Recommended concealed pipe installation, which is conducive to sound insulation and noise reduction; 3. Recommended H pipe fittings, which are conducive to compact pipe layout; 4. In areas with small temperature differences, relax the conditions for setting expansion joints; 5. Added construction methods and measures for pipes passing through basements; 6. Added construction methods for connecting household pipes with outdoor inspection wells; 7. Deleted the regulations on the use of cast iron pipes in local pipe sections, and achieved full plasticization of building drainage pipes; 8. Added measures to prevent fire penetration of exposed rigid polyvinyl chloride pipes passing through floors and walls in high-rise buildings; 9. Recommended the water flow capacity of rigid polyvinyl chloride drainage risers. This code 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 is authorized to be responsible for specific interpretation by the editor-in-chief. The main editor of this code is: Shanghai Architectural Design Institute (Address: No. 258, Shimen 2nd Road, Shanghai, Postal Code 200041)
The participating units of this code are: Shanghai Construction Engineering Design Institute The main drafters of this code are: Zhang Miao, Ying Mingkang, Li Haiguang, Zhou Xueying Engineering Construction Standard Full Text Information System
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Pipeline layout:
Pipeline hydraulic calculation
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General provisions
Pipeline bonding
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Underground pipe laying
Floor pipe installation
Appendix A
Horizontal pipe hydraulic calculation diagram
Explanation of terms used in this code
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1 General
1 This code is formulated to make the design, construction and acceptance of building drainage rigid polyvinyl chloride pipeline projects advanced in technology, economically reasonable, safe and applicable, and ensure quality. 2 This code is applicable to industrial and civil buildings with a building height of no more than 100m. 1.0.2
The continuous discharge temperature in the building is no more than 40℃, and the instantaneous discharge Design, construction and acceptance of domestic drainage pipes with a temperature not exceeding 80°C. 1.0.3 The pipes and fittings of rigid polyvinyl chloride pipes for building drainage shall comply with the requirements of the current national standards "Rigid polyvinyl chloride pipes for building drainage" (GB/T5836.1), "Core foamed rigid polyvinyl chloride pipes for drainage" (GB/T16800) and "Rigid polyvinyl chloride fittings for building drainage" (GB/T5836.2). 1.0.4 In addition to complying with this code, the design, construction and acceptance of rigid polyvinyl chloride pipeline projects for building drainage shall also comply with the provisions of the current relevant national standards. Engineering Construction Standards Full-text Information System
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1 Fireproof casingFi restopingsleeves
A pipe made of fire-resistant material and flame retardant, which is sleeved on the outer wall of rigid polyvinyl chloride pipe to prevent the fire from spreading along the penetration part of the pipe. 2.0.2
2 FirestopsCollar
A collar made of flame retardant expansion agent and sleeved on the outer wall of rigid polyvinyl chloride pipe. In case of fire, the flame retardant expands and squeezes the polyvinyl chloride pipe due to heat, so that it is blocked and prevents the spread of fire.
2.0.3H pipe HPipe
A pipe fitting used to connect the ventilation riser and the drainage riser, which plays the role of connecting the ventilation pipe. 2.0.4 Pipealley
A narrow and inaccessible space constructed for the arrangement of pipes. 2.0.5
5 Air admission valve
A one-way air valve that can automatically add air to balance the pressure in the drainage pipe. Engineering Construction Standard Full Text Information System
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3 Design
3.1 Pipeline Layout
3.1.1 The open or concealed layout of pipelines shall be determined according to the nature, use requirements and architectural layout of the building.
3.1.2 In areas where the average minimum temperature in the coldest month is above 0℃ and the extreme minimum temperature is above -5℃, pipelines can be installed on the exterior wall. 3.1.3 The layout of indoor drainage pipelines in high-rise buildings shall comply with the following provisions: 1 The vertical pipe should be concealed in the pipeline shaft or pipe ceiling. 2 When the vertical pipe is exposed and its pipe diameter is greater than or equal to 110mm, measures should be taken to prevent fire penetration at the place where the vertical pipe passes through the floor. 3 When the open drainage horizontal branch pipe with a pipe diameter greater than or equal to 110mm is connected to the vertical pipe in the pipeline shaft or pipe ceiling, measures should be taken to prevent fire penetration at the place where it passes through the wall of the pipeline shaft or pipe ceiling.
3.1.4 Horizontal main pipes should not pass through fire partition walls and fire walls; when it is unavoidable to pass through, measures should be taken on both sides of the wall where the pipe passes through to prevent fire penetration. 3.1.5 The fire resistance limit of fireproof sleeves, fire-blocking rings, etc. should not be less than the fire resistance limit of building components at the location where the pipe passes through.
3.1.6 Pipes should not be arranged near heat sources. When it cannot be avoided and causes the surface temperature of the pipe to exceed 60°C, insulation measures should be taken. The net distance between the vertical pipe and the edge of the household stove shall not be less than 0.4m. 3.1.7 Pipes shall not pass through flues, settlement joints and seismic joints. Pipes should not pass through expansion joints. When it is necessary to pass through, expansion joints should be installed. 3.1.8 Measures should be taken to prevent leakage when the pipe passes through the outer wall of the basement. 3.1.9 When only the top vent pipe is provided for the drainage riser, the vertical distance h1 from the connection point between the lowest horizontal branch pipe and the riser to the bottom of the discharge pipe shall not be less than the value in Table 3.1.9 (Figure 3.1.9). Engineering Construction Standard Full Text Information System
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Vertical distance from the lowest horizontal branch pipe to the vertical pipe connection to the bottom of the discharge pipe Number of building floors
Vertical distance (m)
Number of building floors
Vertical distance code (m)
Note: 1. When the bottom of the vertical pipe and the diameter of the discharge pipe are enlarged by one size, the vertical distance in the table can be reduced by one size. 2. When the bottom of the vertical pipe cannot meet the requirements of this article and its Note 1, the lowest drainage horizontal branch pipe should be discharged separately. Figure 3.1.9 The vertical distance from the lowest horizontal branch pipe to the vertical pipe connection to the bottom of the discharge pipe 1-vertical pipe; 2-horizontal branch pipe; 3-discharge pipe; 4-45° elbow; 5-eccentric reducer 3.1.10 When the drainage vertical pipe is vertically bent in the middle layer, the connection between the drainage branch pipe and the drainage vertical pipe and the drainage horizontal pipe shall comply with the following provisions (Figure 3.1.10): 1 The vertical distance h1 between the drainage horizontal branch pipe and the bottom of the vertical pipe shall be determined in accordance with Article 3.1.9 of this Code.
2 The horizontal distance L from the connection point between the drainage branch pipe and the horizontal pipe to the bottom of the vertical pipe shall not be less than 1.5m.
3 The vertical distance h2 between the drainage vertical branch pipe and the vertical pipe bend shall not be less than 0.6m. 3.1.11 The drainage vertical pipe shall be equipped with a top-extending vent pipe, and a vent cap shall be installed at the top. When there is no condition to install a top-extending vent pipe, an air supply valve should be installed. 3.1.12 The height of the extended roof vent pipe above the roof (including the insulation layer) shall not be less than 0.3m, and shall be greater than the maximum snow thickness. On roofs where people often move around, the height of the vent pipe extending from the roof shall not be less than 2m.
3.1.13 The diameter of the extended roof vent pipe should not be less than the diameter of the drainage riser. In areas where the average temperature in the coldest month is less than -13℃, when the diameter of the extended roof vent pipe is less than or equal to 125mm, it is advisable to enlarge the diameter by one size from 0.3m below the indoor ceiling, and the minimum diameter should not be less than 110mm.
3.1.14 The design of the vent pipe shall comply with the following provisions: 1 The minimum diameter of the vent pipe shall be determined according to Table 3.1.14. Minimum diameter of vent pipe (mm)
Name of vent pipe
Apparatus vent pipe
Ring vent pipe
Vent riser
Table 3.1.14
2 When the length of the vent riser is greater than 50m, its diameter shall be the same as that of the sewage riser. 3 When two or more sewage risers are connected to one vent riser at the same time, the diameter of the vent riser shall be determined according to Table 3.1.14 for the largest sewage riser, and its diameter should not be smaller than the diameter of any other sewage riser. 4 The diameter of the combined ventilation pipe should not be less than the diameter of the ventilation riser. 3.1.15 When the combined ventilation pipe adopts H-tube, it can be installed in every layer. The connection point between H-tube and ventilation riser should be 0.15m higher than the upper edge of sanitary ware. 3.1.16 When the domestic sewage riser and the domestic wastewater riser share a ventilation riser and H-tube is used as the connecting pipe, the H-tube can be staggered and connected to the domestic sewage riser and the wastewater riser respectively, but the combined ventilation pipe should be installed below the lowest domestic sewage horizontal branch pipe connection point.
The expansion and contraction of the pipeline caused by the change of ambient temperature can be calculated as follows: AL-L·a·At
Where △L——pipeline expansion (m);
L——pipeline length (m);
α——linear expansion coefficient, using 6×10-5~8×10-5m/(m·℃); △t——temperature difference (℃).
3.1.18 Whether to install expansion joints on the pipeline should be determined according to the change of ambient temperature and the location of pipeline layout.
3.1.19 When expansion joints are installed on the pipeline, the following provisions shall be met: 1 When the floor height is less than or equal to 4m, one expansion joint shall be installed on each floor of the sewage riser and ventilation riser: When the floor height is greater than 4m, the number of expansion joints shall be determined based on the design expansion amount of the pipeline and the allowable expansion amount of the expansion joint.
2 When the straight pipe section without converging pipe fittings on the sewage horizontal branch pipe, horizontal main pipe, appliance vent pipe, annular vent pipe and converging vent pipe is greater than 2m, an expansion joint shall be installed, but the maximum spacing between expansion joints shall not be greater than 4m (Figure 3.1.19). 3 The design expansion amount of the pipeline shall not be greater than the allowable expansion amount of the expansion joint in Table 3.1.19.
Maximum allowable expansion of expansion joint (mm)
Pipe diameter (mm)
Maximum allowable expansion
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Table 3.1.19
Engineering Construction Standard Full-text Information System
Figure 3.1.19 Location of expansion joints for drainage pipes and vent pipes 1-sewage riser, 2-special vent riser, 3-lateral branch pipe; 4-annular vent pipe, 5-sewage horizontal main pipe, 6-junction Ventilation pipe, 7-expansion joint, 8-elastic sealing ring expansion joint, 9-H pipe fittings
3.1.20 The expansion joint should be set close to the water flow confluence fittings (Figure 3.1.20) and should comply with the following provisions:
1 When the vertical pipe passes through the floor with a fixed support and the drainage branch pipe is connected under the floor slab, the expansion joint should be set under the water flow confluence fittings (Figure 3.1.20 (a), Engineering Construction Standard Full Text Information System
KAONTKAca=16 When the domestic sewage riser and the domestic wastewater riser share a ventilation riser and the H-tube is used as the connecting pipe, the H-tube can be staggered and connected to the domestic sewage riser and the wastewater riser, but a combined ventilation pipe should be installed below the lowest domestic sewage horizontal branch pipe connection point.
The expansion and contraction of the pipeline caused by the change of ambient temperature can be calculated as follows: AL-L·a·At
Where △L——pipeline expansion (m);
L——pipeline length (m);
α——linear expansion coefficient, using 6×10-5~8×10-5m/(m·℃); △t——temperature difference (℃).
3.1.18Whether to set expansion joints for the pipeline should be determined according to the change of ambient temperature and the location of the pipeline layout.
3.1.19 When expansion joints are installed in pipelines, the following provisions shall be met: 1 When the floor height is less than or equal to 4m, an expansion joint shall be installed on each floor of the sewage riser and ventilation riser: When the floor height is greater than 4m, the number of expansion joints shall be determined based on the design expansion amount of the pipeline and the allowable expansion amount of the expansion joint.
2 When the straight pipe section without converging pipe fittings on the sewage horizontal branch pipe, horizontal main pipe, appliance vent pipe, annular vent pipe and converging vent pipe is greater than 2m, an expansion joint shall be installed, but the maximum spacing between expansion joints shall not be greater than 4m (Figure 3.1.19). 3 The design expansion amount of the pipeline shall not be greater than the allowable expansion amount of the expansion joint in Table 3.1.19.
Maximum allowable expansion of expansion joint (mm)
Pipe diameter (mm)bZxz.net
Maximum allowable expansion
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Table 3.1.19
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Figure 3.1.19 Location of expansion joints for drainage pipes and vent pipes 1-sewage riser, 2-special vent riser, 3-lateral branch pipe; 4-annular vent pipe, 5-sewage horizontal main pipe, 6-junction Ventilation pipe, 7-expansion joint, 8-elastic sealing ring expansion joint, 9-H pipe fittings
3.1.20 The expansion joint should be set close to the water flow confluence fittings (Figure 3.1.20) and should comply with the following provisions:
1 When the vertical pipe passes through the floor with a fixed support and the drainage branch pipe is connected under the floor slab, the expansion joint should be set under the water flow confluence fittings (Figure 3.1.20 (a), Engineering Construction Standard Full Text Information System
KAONTKAca=16 When the domestic sewage riser and the domestic wastewater riser share a ventilation riser and the H-tube is used as the connecting pipe, the H-tube can be staggered and connected to the domestic sewage riser and the wastewater riser, but a combined ventilation pipe should be installed below the lowest domestic sewage horizontal branch pipe connection point.
The expansion and contraction of the pipeline caused by the change of ambient temperature can be calculated as follows: AL-L·a·At
Where △L——pipeline expansion (m);
L——pipeline length (m);
α——linear expansion coefficient, using 6×10-5~8×10-5m/(m·℃); △t——temperature difference (℃).
3.1.18Whether to set expansion joints for the pipeline should be determined according to the change of ambient temperature and the location of the pipeline layout.
3.1.19 When expansion joints are installed in pipelines, the following provisions shall be met: 1 When the floor height is less than or equal to 4m, an expansion joint shall be installed on each floor of the sewage riser and ventilation riser: When the floor height is greater than 4m, the number of expansion joints shall be determined based on the design expansion amount of the pipeline and the allowable expansion amount of the expansion joint.
2 When the straight pipe section without converging pipe fittings on the sewage horizontal branch pipe, horizontal main pipe, appliance vent pipe, annular vent pipe and converging vent pipe is greater than 2m, an expansion joint shall be installed, but the maximum spacing between expansion joints shall not be greater than 4m (Figure 3.1.19). 3 The design expansion amount of the pipeline shall not be greater than the allowable expansion amount of the expansion joint in Table 3.1.19.
Maximum allowable expansion of expansion joint (mm)
Pipe diameter (mm)
Maximum allowable expansion
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Table 3.1.19
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Figure 3.1.19 Location of expansion joints for drainage pipes and vent pipes 1-sewage riser, 2-special vent riser, 3-lateral branch pipe; 4-annular vent pipe, 5-sewage horizontal main pipe, 6-junction Ventilation pipe, 7-expansion joint, 8-elastic sealing ring expansion joint, 9-H pipe fittings
3.1.20 The expansion joint should be set close to the water flow confluence fittings (Figure 3.1.20) and should comply with the following provisions:
1 When the vertical pipe passes through the floor with a fixed support and the drainage branch pipe is connected under the floor slab, the expansion joint should be set under the water flow confluence fittings (Figure 3.1.20 (a), Engineering Construction Standard Full Text Information System
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