This standard specifies the product classification, specifications, dimensions, technical requirements, test methods, inspection rules, marking, transportation, storage, use regulations, factory certification, etc. of prestressed concrete water pipes (core-wrapped wire process). This standard applies to socket-type bidirectional prestressed concrete water pipes with a nominal diameter of 400~3000mm and a hydrostatic pressure of 0.4~1.2MPa manufactured by the "core-wrapped wire process" (three-stage process). The joint type can use a rolling rubber seal or a sliding seal. GB 5696-1994 Prestressed concrete water pipe (core-wrapped wire process) GB5696-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Prestressed concrete water pipe
(core wire wrapping process)
Core type prestressed concrete pipe for water
Subject content and scope of application
GB 5696-94
Replaces GB5696-85
This standard specifies the product classification, specifications and dimensions, technical requirements, test methods, inspection rules, marking, transportation, storage, use regulations, factory certification, etc. of prestressed concrete water pipe (core wire wrapping process). This standard applies to the socket-type bidirectional prestressed concrete water pipe with a nominal diameter of 400~~3000mm and a hydrostatic pressure of 0.4~1.2MPa manufactured by the "core wire wrapping process" (three-stage process). The joint type can use a rolling rubber seal or a sliding seal.
Water and soil that are corrosive to the pipe body and the seal should be protected before laying and use. Non-standard pipes whose nominal diameter and hydrostatic pressure are not within the range specified in this standard may be implemented in accordance with this standard. 2 Reference standards
Portland cement, ordinary Portland cement
GB 175
GB1344
Slag Portland cement, pozzolanic Portland cement and fly ash Portland cementGB4463
GB5223
GB5224
GB8076
Heat-treated steel bars for prestressed concrete
Steel wire for prestressed concrete
Steel twisted wire for prestressed concrete
Concrete admixtures
GB11837
Test method for compressive strength of concrete for concrete pipesGB/T 14684
GB/T 14685
GB/T15345
ZB Q43 001
ZB Q43 002
Sand for construction
Pebbles and crushed stones for construction
Test methods for prestressed concrete water pipes
Rubber seals for prestressed and self-stressed reinforced concrete pipes Test methods for rubber seals for prestressed and self-stressed reinforced concrete pipes JGJ63 Standard for water for concrete mixing
3 Product classification
Pipe grade: According to the hydrostatic pressure during the use of the pipeline, the pipe is divided into five grades, see Table 1. 3.1
Table 1 Pipe grade
Hydrostatic pressure
Approved by the State Administration of Technical Supervision on December 22, 1994 0.6
Implementation on August 1, 1995
GB 5696—94
Note: i) All levels of products are designed under the conditions of bare soil foundation, burial depth of 0.8~2.0m, ground load of two cars of Class 15 and corresponding hydrostatic pressure.
② When the pipe is laid and used under the above conditions, the design calculation shall be carried out according to the ground load, burial depth, hydrostatic pressure, etc. 3.2 Quality grade: According to the appearance quality, dimensional deviation and performance under hydrostatic test pressure of the pipe, it is divided into superior products (A), first-class products (B) and qualified products (C).
3.3 Code and mark: Indicated by molding process (SYG), quality grade, (English letters) pipe grade (Roman numerals), nominal diameter (mm), standard number, Chinese phonetic initial combination "SYG" indicates the pipe core wire-wrapped prestressed pipe with rolling rubber sealing ring joint; "SYGH" indicates the pipe core wire-wrapped prestressed pipe with sliding rubber sealing ring joint. Example: Prestressed concrete pipe with core-wrapped wire process: nominal diameter 800mm, pipe grade is heavy grade, high quality product. SYG HA800 GB 5696
4 Specifications and dimensions
4.1 The pipe manufactured with core-wrapped wire process consists of three parts: a concrete core with longitudinal prestressed steel bars; a.
circumferential prestressed steel wires wrapped around the core; b.
cement mortar protective layer.
4.2 The basic dimensions of the pipe shall comply with the provisions of Figure 1 and Table 2. Figure 1 Pipe shape
Nominal diameter
SYG-400
Inner diameter of pipe
Basic size and reference weight
Effective length
Pipe length
Installation clearance
Core thickness of pipe
Thickness of protective layer
Reference weight
SYG-500
SYG-600
SYG-700
SYG-800
SYG-900
SYG-1 000
SYG-1 200
SYG-1 400
Nominal diameter
Inner diameter of pipe
GB 5696—94
Table 2 continued
Effective length
Body length
Installation clearance
Simplified core thickness Protective layer thickness
Reference weight
SYG-1 600
SYG-1 800
SYG-2 000
SYG-2 200
SYG-2 600
SYG-3 000
Nominal diameter
GB 5696-94
Table 2 continued
Inner diameter of tube body
Effective length
Body length
Installation clearance
Note: ( ) Non-standard molds are allowed to be used until the mold is scrapped. ② According to the conditions and needs, pipes with effective lengths of 4000 and 5000 mm can be produced. Simplified core thickness Protective layer thickness
Reference weight
4.3 The detailed dimensions of the socket and spigot ends shall comply with the provisions of Figure 2 and Table 3 and Table 4. Note: When the socket-type sliding seal ring flexible joint is used, the detailed dimensions of the joint are detailed in Appendix A Socket-type sliding seal ring flexible joint (supplement). 216
Nominal diameter
Outer slope diameter of pipe core socket
GB 5696--94
In n
Figure 2 Pipe joint
Table 3 Detailed dimensions of socket
Working surface diameter
Inner slope
Straight section
Slope projection
PRLPaD
Detailed dimensions
Nominal diameter
5 Technical requirements
Outer diameter of pipe core shell
GB5696—94
Detailed dimensions of spigot
Working surface diameter
5.1 Pipes should be produced and inspected in accordance with the provisions of this standard and the product design structure drawings. 5.2 Raw material quality:
Outer diameter of stop glue table
5.2.1 Cement: Use silicate cement, ordinary silicate cement and slag silicate cement of not less than 425 in GB175 and GB1344 standards.
5.2.2 Sand: It should meet the requirements of GB/T14684 standard. The mud content should not be greater than 1%. 5.2.3 Crushed stone or pebbles: It should meet the requirements of GB/T14685 standard. The maximum particle size of gravel: When the core thickness is less than or equal to 50mm, it should not be greater than 15mm; when the core thickness is greater than 50mm, it should be 20mm, and it should not be greater than one-fourth of the core thickness of the cylinder. 5.2.4 Water for concrete mixing: It shall not affect the product quality and water delivery quality. It shall meet the requirements of JGJ63 standard. 5.2.5 Admixtures shall meet the relevant provisions of GB8076 standard. 5.2.6 Prestressed circumferential and longitudinal reinforcements shall comply with the provisions of GB4463, GB5223 and GB5224. For longitudinal prestressed reinforcement, threaded reinforcement shall be used when self-anchoring is adopted. 5.3 Concrete strength:
5.3.1 The strength grade of the core concrete shall not be lower than C40, and the demoulding strength shall not be lower than 28MPa. 5.3.2 The wire wrapping strength of the core concrete shall not be lower than the values ​​listed in Table 5. 5.3.3 The core concrete strength of the pipe shall not be lower than 90% of the strength grade when the pipe leaves the factory. 5.3.4 The wire wrapping strength and 28d strength are determined by multiplying the standard cubic specimen strength by the strength coefficient: the strength coefficient is determined by each factory through experiments. When there is no sufficient experimental basis, it can be used as follows: 1.25 for centrifugal molding, 1.00 for suspension roller molding and vertical vibration molding. 5.4 Quality of protective layer:
5.4.1 The mortar protective layer should have sufficient impermeability. When the water absorption area is 3000mm2, the average water absorption height in 30min shall not exceed 218
35 mm.
GB 569694
5.4.2 The strength grade of the protective layer mortar shall not be lower than C30, and the factory strength shall not be lower than 90% of the strength grade. 5.4.3 The cement used for the protective layer mortar should be the same as the cement used for the core concrete. 5.5 Appearance quality:
5.5.1 The working surface of the socket and the working surface of the spigot of each quality grade of pipes, the inner wall of the pipe body, the appearance quality of the protective layer, and defect repair shall comply with the requirements of Table 6.
Nominal diameter
Pipe grade
Inspection items
Working surface of the socket
Working surface of the spigot
Inner wall of the pipe body
Defect repair
Superior products
Qualified products
Superior products
First-class products
Qualified products
Superior products
First-class products
Qualified products
Superior products
Qualified products
Superior products
Qualified products
Wire wrapping strength
1000120014001800200022002600300034
Table 6 Appearance quality
Nominal diameter, mm
400～3.000
Smooth and flat, no honeycomb or peeling. 46
No honeycomb or peeling, defect concave-convex degree is not more than 1mm, area is not more than 20mm. No honeycomb or peeling, defect concave-convex degree is not more than 2mm, area is not more than 30mm2Smooth and flat, no honeycomb, notch, peeling, missing edge, etc. No honeycomb, notch, peeling, missing edge, etc. For the same products, the missing edges can be repaired completely
The inner wall should be smooth and flat, and there should be no exposed stones or scum. The inner wall should be flat, and there should be no exposed stones or scum. The inner wall should be flat, and there should be no exposed stones
The protective layer should not have hollowing, cracks, or falling off. The protective layer should not have hollowing, cracks, or falling off. Except for the repair of the longitudinal reinforcement head, no other repairs are allowed. The repair is complete, firmly bonded, smooth and flat, and no repairs should be missed. 5.5.2 There should be no ash and slag on the outer guide slope of the socket, the outer edge and inner side of the plug stop glue platform. , The installation line, the thickness of the protective layer, and the height of the stop glue platform shall not exceed. 5.5.3
5.5.4 The slope of the outer diameter at both ends of the pipe should not be greater than 1/150 of the nominal diameter, and not greater than 5mm. 5.5.5 The exposed longitudinal steel bar head on the end face of the pipe body must be burned off, leaving a pit with a depth of 5mm, which should be filled with non-toxic anti-corrosion materials such as mortar. 219
GB569694
5.5.6 The working surface of the pipe body bearing and the socket shall not be damaged. If the length of the continuous circumferential damage is less than 250mm and the sealing performance and structural performance are not reduced, it should be repaired.
5.6 The allowable deviation of the pipe body size shall not exceed the provisions of Table 7 and Table 8. Table 7 Dimensional allowable deviation
Inspection items
Working surface diameter
Working surface length
Working surface diameter
Outer diameter of glue stop table
Thickness of protective layer
Thickness of simplified core
Superior products
Qualified products
Superior products
First-class products
Qualified products
Superior products
First-class products
Qualified products
Superior products
Qualified products
Superior products
Qualified Quality
Superior quality
First-class quality
Qualified quality
400500600700800900100012001400160018002000220026003000+2
Socket outer guide slope diameter Dz
Socket inner slope diameter D4
Socket working surface length
Protective layer thickness hz
(Installation line)
Pipe level
Test pressure
GB5696-94
Dimensional allowable deviation
400500 600
900100012001400160018002000220026003000±4
Table 9 Water-tightness test pressure
5.7 Hydrostatic pressure test:
5.7.1 The test pressure index of pipe water-tightness and joint sealing performance must meet the requirements of Table 9. V
Under the water-tightness test pressure, the water-tightness and joint sealing performance of the pipe body shall meet the requirements of Table 10. 5.7.2
The pipe crack resistance test pressure index must meet the requirements of Table 11. Under the crack resistance test pressure, the pipe crack resistance performance shall meet the requirements of Table 10. The relative rotation angle allowed for the pipe is listed in Table 12. Under the water-tightness test pressure, the joint should not drip. 5.8 The longitudinal prestress value of the annular section of the pipe cylinder shall not be lower than the requirements of Table 13. Table 10 Performance of pipes under hydrostatic test pressure Nominal diameter (mm)
Test items
Impermeability
Sealing performance
Anti-cracking performance
Quality grade
Superior products
-grade products
Qualified products
Superior products
First-grade products
Qualified products
Superior products
First-grade products
Qualified products
400 500 600 700 800 900 1000 12001 400 1600 1800 2 000 2 2002 600 3 000 There should be no moisture flakes on the surface of the pipe body.
For every square meter of pipe surface area, the area of ​​the tidal sheet shall not exceed 20cm2, and there shall be no sweating, water spraying or water spraying on the pipe surface at less than or equal to 3 places.
For every square meter of pipe surface area, the area of ​​the tidal sheet shall not exceed 40cm2, and there shall be no sweating, water spraying or water spraying on the pipe surface at less than or equal to 5 places.
There shall be no dripping of water during one inspection.
It is allowed to reinstall and re-inspect once, and there shall be no dripping of water
There shall be no cracking under the anti-crack test pressure.
There shall be no cracking under the anti-crack test pressure, but the re-test may be doubled. 221
Pipe gradebzxZ.net
Nominal diameter,
GB5696-94
Anti-crack test pressure
Note: The data in the table are horizontal pressure inspection indicators, and the values ​​in brackets are vertical pressure inspection indicators. 1
Table 12 Allowable relative rotation angle
Nominal diameter, mm
400~700
800~1400
1600~3000
Allowable relative rotation angle, )
General level
6 Test method
GB5696—94
Table 13 Longitudinal precompressive stress value of annular section of pipe cylinder Nominal diameter, mm
100012001400160018002000220026003000700
6.1 The specifications, dimensions, appearance quality and hydrostatic pressure of the pipe shall be in accordance with GB/T15345. 6.2 The strength of the core concrete is determined by multiplying the compressive strength of a 100mm concrete cube specimen with the same concrete mixture and the same curing conditions as the product by the conversion coefficient, in accordance with the method of GB11837. 6.3 The stress values ​​of the circumferential and longitudinal prestressed steel bars are measured by a "three-point stress meter" or other measuring tools. 7 Inspection rules
7.1 Product inspection is divided into factory inspection and type inspection. 7.2 Factory inspection:
7.2.1 Factory inspection items: appearance quality, dimensional deviation, hydrostatic pressure, concrete strength and other related items. 7.2.2 Batch: 100 pipes of the same model made of homogeneous materials and the same process are an inspection batch. If the number is less than 100 but not less than 30, it can also be regarded as a batch
7.2.3 Sampling: The appearance quality is inspected one by one; the sampling quantity of the main dimensional deviation is shown in Table 14. Table 14 Sampling quantity of the main dimensional deviation of pipes Inspection items
Inner diameter D of pipe.
Thickness of pipe body h
Diameter of working surface D3
Length of working surface 12
Diameter of working surface Ds
Outer diameter of stop glue Ds
Thickness of protective layer hz (finished product)
Quantity of sampling
According to user requirements, but not more than 2% of the batch. Hydrostatic pressure test, impermeability and joint sealing performance are tested one by one, and two are randomly selected for crack resistance water pressure test. Concrete strength: demoulding strength, wire wrapping strength, factory strength of pipe core concrete should be regularly checked and recorded; test records should be kept for the strength of protective layer mortar; control stress values ​​of circumferential and longitudinal prestressed steel bars should be regularly checked and recorded. For inspection and acceptance. 7.2.4 When the factory inspection results meet the corresponding grade requirements of this standard, it shall be judged as this grade. 7.2.5 During the factory inspection, corresponding measures should be taken to deal with the following situations. 223
GB5696-94
7.2.5.1 Pipes that are damaged, defective or fail the appearance inspection shall be repaired and then re-inspected for appearance quality. 7.2.5.2 Pipes that fail the impermeability test and joint sealing performance test shall be repaired or moistened or reinstalled and then re-inspected. If they still fail, they shall be downgraded. 1 grade is downgraded to substandard products. 7.2.5.3, if there is one unqualified pipe in the crack resistance test, double the number of pipes shall be re-inspected. If there is still one unqualified pipe, the batch of pipes shall be inspected one by one or downgraded for acceptance.
7.2.5.4 The measurement and inspection of the thickness of the protective layer shall be carried out at the same time as the production of the protective layer. 7.2.5.5 The inspection of the impermeability of the protective layer mortar shall be carried out at three locations on the same straight line of the pipe body for simultaneous measurement. 7.2.6 The user unit has the right to conduct random inspections on the pipes delivered for use in accordance with the requirements of the impermeability and crack resistance inspections of this standard in cooperation with the manufacturer. 7.3 Type inspection:
7.3.1 Type inspection should be carried out in the following cases: a.
Trial-production identification of new products or conversion of old products: after formal production, if there are major changes in structure, materials, and processes that may affect product performance; during normal production, an inspection should be carried out once a year; when the product resumes production after a long period of suspension;
When there is a significant difference between the factory inspection results and the most recent type inspection results, the national quality supervision agency proposes a requirement for type inspection. Batch regulations for type inspection: the same as factory inspection. Inspection items and sampling quantity are shown in Table 15.
Table 15 Inspection items and sampling quantity for type inspection Inspection items
Socket working surface
Socket working surface
Appearance quality
Main dimensions!
Outer wall of pipe body
Inner wall of pipe body
Treatment of longitudinal reinforcement head
Repair quality and missed repair situation
Inner diameter of pipe body
Outer diameter of stop glue platform
Diameter of socket working surface
Diameter of plug working surface
Length of socket working surface
Thickness of protective layer
Anti-crack performance of pipe body
Anti-seepage performance of pipe body
Physical properties Sealing performance of joint
Sealing performance of corner joint
Concrete strength
7.3.4 Judgment rules:
Number of random inspections
When all test results meet the requirements of the corresponding grade of this standard, it shall be judged as this grade. 224
Randomly select from 2
Randomly select from 6
Randomly select from 10
Same as the anti-seepage test sample
Inspection record
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