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GB/T 19685-2017: Prestressed concrete cylinder pipe
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Basic data | Standard ID | GB/T 19685-2017 (GB/T19685-2017) | | Description (Translated English) | Prestressed concrete cylinder pipe | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Q14 | | Classification of International Standard | 91.100.30 | | Word Count Estimation | 26,220 | | Date of Issue | 2017-03-09 | | Date of Implementation | 2018-02-01 | | Older Standard (superseded by this standard) | GB/T 19685-2005 | | Quoted Standard | GB 175; GB/T 699; GB/T 700; GB 912; GB 1499.2; GB/T 1499.3; GB/T 1596-2005; GB/T 2651; GB/T 2653; GB/T 3274; GB/T 5223; GB 8076; GB/T 11253; GB 13788; GB/T 14684; GB/T 14685; GB/T 15345; GB 50046; GB/T 50081-2002; GB/T 50107; GB 50119; GB 50204; GB 50212; | | Regulation (derived from) | National Standard Notice No. 5 of 2017 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the terminology, definitions, main symbols, classification, raw and auxiliary materials, pipe technical requirements, pipe fittings, test methods, inspection rules, marking, transportation and storage, use regulations and factory certificates of prestressed concrete drums. content. This standard applies to the manufacture of nominal diameter of 400 mm ~ 4000 mm, the pipeline operating pressure or hydrostatic head does not exceed 2.0 MPa prestressed steel tube concrete pipe. Manufacture of pipes beyond the limits given in this standard may be carried out with reference to this standard. Pipes made in accordance with this standard can be used for urban water supply and sewerage, industrial water supply pipelines, farmland irrigation, factory pipe network, power plant supply and water supply and cooling water circulation systems, inverted siphon pipes, pressure tunnel pipelines, pipe ditches, corridors and deep- Wait. | GB/T 19685-2017: Prestressed concrete cylinder pipe---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Prestressed concrete cylinder pipe
ICS 91.100.30
Q14
National Standards of People's Republic of China
Replace GB/T 19685-2005
Prestressed steel cylinder concrete pipe
Published on.2017-03-09
2018-02-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Content
Foreword I
1 Scope 1
2 Normative references 1
3 terms, definitions and main symbols 2
4 Category 4
5 raw and auxiliary materials 9
6 Tube Technical Requirements 11
7 pipe fittings 17
8 Test method 19
9 Inspection rules 19
10 Marking, transport and storage 22
11 Terms of Use 22
12 Factory Certificate 22
Appendix A (Normative) Crack Resistance Test Pressure (Pt) 23
Figure 1 Schematic diagram of a lined prestressed steel cylinder concrete pipe (PCCPL)
Figure 2 Schematic diagram of embedded prestressed steel cylinder concrete pipe (PCCPE) 8
Figure 3 Joint steel ring section detail Figure 9
Table 1 Basic dimensions of lined prestressed steel cylinder concrete pipe (PCCPSL, PCCPDL)
Table 2 Basic dimensions of embedded prestressed steel cylinder concrete pipe (PCCPSE)
Table 3 Basic dimensions of embedded prestressed steel cylinder concrete pipe (PCCPDE)
Table 4 Socket steel ring basic size 9
Table 5 Allowable deviation of finished pipe 15
Table 6 joints allow relative corners 16
Table 7 Minimum thickness of steel plate for accessories 18
Table 8 Number of factory inspection samples 20
Table 9 Type inspection sample number 21
Table 10 The number of layers allowed for the finished tube 22
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 19685-2005 "Prestressed steel cylinder concrete pipe".
Compared with GB/T 19685-2005, the main changes of this standard are as follows.
--- The scope limits the depth of the top cover of the pipe (see Chapter 1 of the.2005 edition);
--- Revised some normative references (see Chapter 2, Chapter 2 of the.2005 edition);
--- Added double apron joint lining pipe gauge for PCCPDL600, PCCPDL700, PCCPDL800 and PCCPDL900
Grid (see Table 1);
--- Increased the specifications of the single-aperture and double-aperture joint embedded pipe of PCCPE1000 and PCCPE1200 (see Table 2 and Table 3);
---Adjusted the depth of the socket of the PCCPDE3600, PCCPDE3800 and PCCPDE4000 double apron joint embedded pipe, socket
Length and joint clearance (see Table 3, Table 3 of the.2005 edition);
--- Adjusted the minimum protective layer net thickness (see Table 1, Table 2, Table 3,.2005, Table 1, Table 2, Table 3);
--- Adjusted the mud content of the core concrete (see 5.2,.2005 version 5.2);
--- Adjusted the water absorption index of the cement mortar protective layer (see 6.2.10.3,.2005 edition of 6.2.9.3);
--- Removed the thickness deviation requirements of the die, adjusted the depth of the socket, the length deviation of the socket (see Table 5, Table 5 of the.2005 version);
--- Adjusted the allowable relative rotation angle of some pipe joints (see Table 6, Table 6 of.2005);
--- Adjusted some inspection items and indicator categories (see Table 8, Table 9, Table 8, Table 9 of the.2005 version);
--- Removed Appendix A and Appendix B of the.2005 version;
--- Adjusted the crack test pressure (Pt value) of the finished pipe in normal working conditions (see Appendix A, Appendix C of the.2005 edition).
This standard was proposed by the China Building Materials Federation.
This standard is under the jurisdiction of the National Cement Products Standardization Technical Committee (SAC/TC197).
This standard is drafted by. Suzhou Concrete Cement Products Research Institute Co., Ltd., Suzhou Sinoma Building Materials Design and Research Institute Limited
the company.
This standard was drafted. Beijing Hanjian Heshan Pipe Industry Co., Ltd., Wuxi Huayi Pipeline Co., Ltd., Zhejiang Julong Pipe Industry Co., Ltd.
Company, Shandong Shanshui Cement Group Co., Ltd. Pipeline Branch, Shandong Longquan Pipeline Engineering Co., Ltd., Ningxia Qinglong Pipe Industry Co., Ltd.
Co., Ltd., Shanxi Yellow River Water Conservancy Engineering Consulting Co., Ltd., China Municipal Engineering Northeast Design and Research Institute, Xinjiang Guotong Pipeline Co., Ltd.
Company, Shandong Electric Power Pipeline Engineering Company, Hangzhou Huazhe Prefabricated Component Co., Ltd., Shandong Yuwang Pipe Industry Co., Ltd., Hebei Construction Group
Pipe Industry Co., Ltd., Nanning Hongji Cement Products Co., Ltd., Zhongshui Sixth Bureau Huazhe Kaiyuan Pipe Industry Co., Ltd., Hengrun Group Co., Ltd.,
Wuhan Shuangqiang Pipe Industry Co., Ltd., Tianjin Zebao Cement Products Co., Ltd., Puyang Huali Cement Products Co., Ltd., Chengdu Jinyu Pipe Manufacturing Co., Ltd.
Limited Liability Company, Yunnan Shengbolong Pipe Industry Co., Ltd., Shijiazhuang Tongtian Pipe Industry Co., Ltd., Fujian Zhengtong Pipeline Co., Ltd., Suizhou City
Tongda Pipeline Co., Ltd., Jiangsu Xinjia Pipe Industry Co., Ltd., Tianjin Yinlong Prestressed Material Co., Ltd., Hangzhou Heda Electromechanical Engineering
Company, Jiangsu Jiangyang Building Material Machinery Co., Ltd., Jiangsu Huaguang Shuangshun Machinery Manufacturing Co., Ltd., Jiangsu Zhongyi Building Material Machinery Co., Ltd.,
Gongshi Jiashite Sealing Products Co., Ltd.
The main drafters of this standard. Yu Hongfang, Liu Jiangning, Wu Yueren, Ni Zhiquan, Fu Zhizhang, Wang Xiangmin, Ning Jinghua, Gao Jinping, Chen Guangyu,
Xu Yongping, Wang Na, Zheng Yibin, Zhang Jinfeng, Zhao Hongjie, He Dong, Xie Yifei.
The previous versions of the standards replaced by this standard are.
---GB/T 19685-2005.
Prestressed steel cylinder concrete pipe
1 Scope
This standard specifies the terms, definitions, main symbols, classification, raw and auxiliary materials, pipe-making technical requirements, pipe fittings, and pre-stressed steel cylinder concrete pipes.
Test methods, inspection rules, signs, transportation and storage, use regulations and factory certificates.
This standard is applicable to the manufacture of nominal inner diameter of 400mm~4000mm, working pressure of pipeline operation or static water head not exceeding 2.0MPa.
Prestressed steel cylinder concrete pipe. Refer to this standard for the manufacture of pipes beyond the limits given in this standard.
Pipes manufactured according to this standard can be used for urban water supply and drainage mains, industrial water pipelines, farmland irrigation, factory pipe networks, power plant recharge water
Pipe and cooling water circulation system, inverted siphon, pressure tunnel pipeline, pipe trench, pipe gallery and deep soil culvert.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB 175 universal Portland cement
GB/T 699 high quality carbon structural steel
GB/T 700 carbon structural steel
GB 912 carbon structural steel and low alloy structural steel hot rolled steel sheet and strip
GB 1499.2 Steel for reinforced concrete - Part 2. Hot rolled ribbed bars
GB/T 1499.3 Steel for reinforced concrete - Part 3. welded steel mesh
GB/T 1596-2005 Fly ash used in cement and concrete
GB/T 2651 welded joint tensile test method
GB/T 2653 welded joint bending test method
GB/T 3274 carbon structural steel and low alloy structural steel hot rolled thick steel plate and steel strip
GB/T 5223 steel wire for prestressed concrete
GB 8076 concrete admixture
GB/T 11253 carbon structural steel cold rolled steel sheet and strip
GB 13788 cold rolled ribbed bar
GB/T 14684 construction sand
GB/T 14685 construction pebble, gravel
GB/T 15345 concrete water pipe test method
GB 50046 industrial building anti-corrosion design specification
GB/T 50081-2002 Standard Test Method for Mechanical Properties of Ordinary Concrete
GB/T 50107 concrete strength inspection and evaluation standard
GB 50119 Concrete Admixture Application Technical Specifications
GB 50204 Concrete Structure Engineering Construction Quality Acceptance Specification
GB 50212 Construction anti-corrosion engineering construction specification
GB 50224 Construction Anti-corrosion Engineering Construction Quality Acceptance Specification
GB 50236 Field equipment, industrial pipeline welding engineering construction specifications
GB 50268 Water supply and drainage pipeline engineering construction and acceptance specifications
GB 50332-2002 Water supply and drainage engineering pipeline structure design specification
DL/T 5017 Specification for the manufacture, installation and acceptance of pressure pipes for water conservancy and hydropower projects
JGJ55 general concrete mix design procedure
JGJ63 concrete water standard
JC/T 748 rubber seal ring for prestressed and self-stressing concrete pipes
JC/T 749 Test method for rubber seals for prestressed and self-stressed concrete pipes
JC/T 1091 prestressed steel cylinder concrete pipe joint profile steel
CECS140-2011 Code for design of buried prestressed concrete pipe and prestressed steel cylinder concrete pipe structure for water supply and drainage project
CECS141-2002 Code for design of buried steel pipe structure for water supply and drainage project
3 terms, definitions and main symbols
The following terms, definitions and main symbols apply to this document.
3.1 Terms and definitions
3.1.1
a tube made by winding a circumferentially prestressed steel wire outside a concrete core with a steel cylinder and making a protective layer of cement mortar, including
Lined prestressed steel cylinder concrete pipe (PCCPL) and embedded prestressed steel cylinder concrete pipe (PCCPE).
3.1.2
The core is composed of a steel cylinder and a concrete lining, and a circumferential prestressed steel wire is wound on the outer side of the steel cylinder, and then a protective layer of cement mortar is prepared.
Into the pipe.
3.1.3
The core is composed of the inner and outer concrete layers of the steel cylinder and the steel cylinder, and the circumferential prestressed steel wire is wound on the outer side of the tubular concrete, and then the water is produced.
A pipe made of a protective layer of mud mortar.
3.1.4
The pipe joint adopts a single rubber sealing ring for flexible sealing connection of prestressed steel cylinder concrete pipe, including single apron lining pre-
Stress steel cylinder concrete pipe (referred to as PCCPSL) and single apron embedded prestressed steel cylinder concrete pipe (referred to as PCCPSE).
3.1.5
The pipe joint adopts two rubber sealing rings for flexible sealing connection of prestressed steel cylinder concrete pipe, including double apron lining type pre-
Stress steel cylinder concrete pipe (referred to as PCCPDL) and double apron embedded prestressed steel cylinder concrete pipe (referred to as PCCPDE).
3.1.6
Fittings fittings
Steel plate as the main structural material and made of steel (silk) mesh cement mortar on the inside or outside of the steel plate or coated with other anti-corrosion materials
Pipe fittings.
3.1.7
Shaped tube specialpipe
Non-standard pipe fittings manufactured in the same process as prestressed steel cylinder concrete pipes.
3.1.8
Spiral welding helicaseamwelded
A welding method for winding a thin steel plate into a steel cylinder in a spiral manner and simultaneously performing automatic welding, and a weld seam on the steel cylinder
Spiral loop seam.
3.1.9
Jigsaw welding spliceseamwelded
Based on the longitudinal length dimension of the steel cylinder, the steel sheet is cut to length, longitudinally welded, and finally rolled into a steel cylinder and welded.
In the welding cylinder method, the weld seam on the steel cylinder body is longitudinal straight seam.
3.1.10
Working pressure workingpressure
Excluding the water hammer pressure, the maximum internal water pressure generated by a hydraulic gradient in a certain pipeline or a pipe is specified by the owner.
Hydrostatic pressure.
3.1.11
Covering depth heightoffilabovetopofpipe
The distance between the top of the buried pipeline body and the ground surface.
3.2 main symbols
D0 --- the nominal inner diameter of the pipe, in millimeters (mm);
Dy --- outer diameter of the steel cylinder, the unit is millimeter (mm);
Tc --- the thickness of the die (including the thickness of the steel cylinder ty) in millimeters (mm);
Ty --- steel cylinder thickness in millimeters (mm);
Tg --- protective layer thickness in millimeters (mm);
L0 --- effective length of the pipe, the unit is millimeter (mm);
L --- pipe length in millimeters (mm);
Bb --- the inner diameter of the socket face, in millimeters (mm);
Bs --- Socket working face outer diameter, in millimeters (mm);
C --- socket depth in millimeters (mm);
E --- socket length in millimeters (mm);
Pg --- steel cylinder impermeability test pressure, the unit is MPa (MPa);
Pt --- crack test internal pressure, the unit is megapascals (MPa);
Pc --- cracking external pressure test load, in units of kilonewtons per meter (kN/m);
Ap --- the area of the circumferential prestressed steel wire per meter length, in square millimeters (mm2);
An --- per square meter of pipe wall section wall concrete, steel cylinder, steel wire and mortar protective layer conversion area, the unit is square millimeter
(mm2);
Σpe --- the ultimate effective pre-stressing of the hoop wire in units of cattle per square millimeter (N/mm 2 );
Ftk --- standard value of tensile strength of tubular concrete, in units of cattle per square millimeter (N/mm2);
b --- tube axial length, the value is 1000, the unit is mm (mm);
Ro --- Calculate the radius of the pipe wall section in millimeters (mm);
α --- control mortar cracking coefficient, 1.06 for PCCPE; 0.65 for PCCPL;
Ωc --- The inner side of the pipe wall is subjected to the elastic deformation resistance coefficient of the tensile edge concrete.
4 classification
4.1 Product Classification
Prestressed steel cylinder concrete pipe (PCCP) is divided into inner lining prestressed steel cylinder concrete pipe (PCCPL) and embedded prestress according to its structure.
Steel cylinder concrete pipe (PCCPE); according to the joint type of pipe joint, it is divided into single rubber ring prestressed steel cylinder concrete pipe (PCCPSL,
PCCPSE) and double apron prestressed steel cylinder concrete pipe (PCCPDL, PCCPDE).
4.2 Specifications and dimensions
The basic dimensions of prestressed steel cylinder concrete pipes shall comply with the requirements of Table 1, Table 2 and Table 3 respectively; the prestressed steel cylinder concrete pipe structure
The formula shall conform to the requirements of Figures 1 and 2 respectively; the shape and size of the pipe socket joint steel ring shall comply with the requirements of Table 4 and Figure 3.
Note. Pipes of other sizes and sizes can be produced after negotiation between the supplier and the buyer.
Table 1 Basic dimensions of lined prestressed steel cylinder concrete pipe (PCCPSL, PCCPDL)
tube
Variety
Nominal
the inside diameter of
D0
Mm
Minimum
Die
thickness
Tc
Mm
Minimum
The protective layer
Net thickness
Mm
Steel cylinder
thickness
Ty
Mm
Mouth
depth
Mm
socket
length
Mm
Mouth
Working face
the inside diameter of
Bb
Mm
socket
Working face
Outer diameter
Bs
Mm
Connector
Inner gap
Mm
Connector
Outer clearance
Mm
Apron
diameter
Mm
effective
length
L0
Mm
tube
length
Mm
reference
weight
t/m
PCCPSL
25 1.5 93 93
0.23
0.28
0.31
0.41
0.50
0.60
0.70
0.94
1.35
PCCPDL
25 1.5 160 160
0.31
0.41
0.50
0.60
0.70
0.94
1.35
a) PCCPL pipe outline drawing
b) PCCPSL pipe joint diagram
c) PCCPDL pipe joint diagram
Note. The steel cylinder can also be welded on the outside of the socket steel ring, and the outer diameter Dy of the steel cylinder is determined by design.
Figure 1 Schematic diagram of a lined prestressed steel cylinder concrete pipe (PCCPL)
Table 2 Basic dimensions of embedded prestressed steel cylinder concrete pipe (PCCPSE)
Nominal
the inside diameter of
D0
Mm
Minimum
Die
thickness
Tc
Mm
Minimum
protection
Layer net
thickness
Mm
Steel cylinder
thickness
Ty
Mm
Mouth
depth
Mm
socket
length
Mm
Minimum
Mouth contractor
Face
the inside diameter of
Bb
Mm
Minimum
Socket worker
Face
Outer diameter
Bs
Mm
Connector
Inner gap
Mm
Connector
Outer clearance
Mm
Apron
diameter
Mm
effective
length
L0
Mm
tube
length
Mm
reference
weight
t/m
25 1.5 108 108
1.02
1.30
1.53
1.74
2.19
2.58
3.12
3.61
4.25
3200.200
25 1.5 150 150
4.81
5.54
6.21
7.19
7.91
8.80
9.78
Table 3 Basic dimensions of embedded prestressed steel cylinder concrete pipe (PCCPDE)
Nominal
the inside diameter of
D0
Mm
Minimum
Die
thickness
Tc
Mm
Minimum
protection
Layer net
thickness
Mm
Steel cylinder
thickness
Ty
Mm
Mouth
depth
Mm
socket
length
Mm
Minimum
Mouth contractor
Face
the inside diameter of
Bb
Mm
Minimum
Socket worker
Face
Outer diameter
Bs
Mm
Connector
Inner gap
Mm
Connector
Outer clearance
Mm
Apron
diameter
Mm
effective
length
L0
Mm
tube
length
Mm
reference
weight
t/m
3200.200
25 1.5 160 160
1.02
1.30
1.53
1.74
2.19
2.58
3.12
3.61
4.25
4.81
5.54
6.21
7.19
25 1.5 180 180
7.91
8.80
9.78
The unit is mm
a) PCCPE pipe outline drawing
b) PCCPSE pipe joint diagram
c) PCCPDE pipe joint diagram
Note. The steel cylinder can also be welded to the inside of the socket steel ring. The outer diameter Dy of the steel cylinder is determined by design.
Figure 2 Schematic diagram of embedded prestressed steel cylinder concrete pipe (PCCPE)
a) Detail of the cross section of the single apron joint steel ring
b) Detail of the cross section of the double apron joint steel ring
Figure 3 Joint steel ring cross-section detail
Table 4 The basic dimensions of the socket steel ring are in millimeters
Steel ring
kind
Nominal inner diameter
Socket steel ring socket steel ring
Ts Ws abch tb Wb def
400~1200 16.0 140 22.0 10.0 11.1 - 6.0~8.0 130 7.0 26.0 76
1400~2600 16.0 140 22.0 10.0 11.1 - 8.0 165 7.0 26.0 110
2800~4000 16.2 184 21.8 10.0 11.4 - 8.0~10.0 203 10.0 26.0 114
600~2600 19.0 205 21.0 10.0 11.0 16.0 8.0 216 10.0 26.0 127
2800~3400 19.0 205 21.0 10.0 11.0 16.0 8.0~10.0 216 10.0 26.0 127
3600~4000 21.0 240 25.0 10.0 13.0 16.0 10.0 236 10.0 26.0 147
4.3 Product Marking
The product mark shall consist of the pipe code, nominal inner diameter, effective length, working pressure (P), soil depth (H) and standard number.
Example 1. Single apron inner liner with a nominal inner diameter of 1000 mm, an effective length of the tube of 5000 mm, a working pressure of 0.8 MPa, and a soil depth of 4 m.
Stress steel cylinder concrete pipe, marked as follows.
Example 2. Double apron embedded pre-predetermined with a nominal inner diameter of 4000 mm, an effective length of the pipe of 6000 mm, a working pressure of 1.6 MPa, and a soil depth of 6 m.
Stress steel cylinder concrete pipe, marked as follows.
5 raw and auxiliary materials
5.1 Cement
The cement used for pipe making shall be Portland cement, ordinary Portland cement, slag Portland cement, and the cement performance shall conform to GB 175 respectively.
Provisions. When using active blending materials as a substitute for cement, the cement strength rating should not be lower than 42.5.
5.2 Fine aggregate
The core concrete should be made of natural medium coarse sand or artificial sand. The quality requirements of the sand should meet the requirements of GB/T 14684, and the mud content is not
Should be greater than 2%. The protective layer cement mortar should be made of natural fine sand. The quality requirements of the sand should meet the requirements of GB/T 14684.
Not more than 1%.
5.3 coarse aggregate
The coarse aggregate for the tubular concrete shall be artificial gravel or pebbles. The maximum particle size of the stone shall not exceed 31.5mm and shall not be greater than concrete.
2/5 of the layer thickness. The quality requirements of the stone should meet the requirements of GB/T 14685.
5.4 Water
The curing water for the pipe concrete, cement mortar, cement paste mixing water and finished pipe shall comply with the provisions of JGJ63.
5.5 Concrete admixture
When using an admixture, the admixture used should not have a detrimental effect on the pipe or water quality, and the quality requirements should comply with the provisions of GB 8076.
5.6 Active admixture
When needed, the core concrete is allowed to be blended with finished fly ash, ground slag or silica fume. The quality requirements of finished fly ash should not be low
The provisions of Class II ash in Table 1 of GB/T 1596-2005; the quality requirements of ground slag or silica fume shall comply with the corresponding standards.
5.7 steel wire
The prestressed steel wire for pipe making shall be cold drawn steel wire, and the mechanical properties of the steel wire shall comply with the provisions of GB/T 5223.
5.8 thin steel plate
The steel sheets for the manufacture of steel cylinders shall comply with the provisions of GB/T 700, GB 912 and GB/T 11253, respectively, and the minimum yield strength of the steel sheets.
Should not be lower than 215 MPa.
5.9 socket steel plate and socket steel
The quality requirements for the socket steel plate and socket steel used for the manufacture of socket joint steel rings shall be in accordance with GB/T 699, GB/T 700 and
GB/T 3274 stipulates that the minimum yield strength of steel plates shall not be lower than 235 MPa. When purchasing steel for finished joints, JC/T 1091 should be followed.
Provisions.
5.10 Steel plate for accessories
The steel plates for manufacturing accessories shall comply with the provisions of GB/T 699, GB/T 700 and GB/T 3274, respectively. The yield strength of the steel plate should not be low
The wall stress caused by the design working pressure is twice and the minimum yield strength of the steel plate should not be lower than 215 MPa.
5.11 welded steel mesh
The steel mesh for reinforcing the protective layer and accessories of cement mortar shall be made of machinery. The diameter of the steel or steel wire used shall not be less than
3.0mm, its minimum yield strength should not be lower than 235MPa. The technical requirements of the welded steel mesh shall comply with the provisions of GB/T 1499.3.
5.12 Reinforcing steel bars
Reinforced steel bars shall comply with the provisions of GB 1499.2 and GB 13788, respectively, and the minimum yield strength of steel bars shall not be lower than 335 MPa.
5.13 apron
5.13.1 Apron performance
The rubber sealing ring for pipe joints shall adopt a solid rubber ring with a circular cross section. The size and volume of the rubber ring shall be the same as the rubber groove of the socket steel ring.
The inch matches the fit gap. The basic performance and quality requirements of rubber seals shall comply with the provisions of JC/T 748, rubber seals respectively.
The performance test shall be in accordance with JC/T 749.
5.13.2 stitching of rubber rings
Rubber seals for pipe joints allow for splicing. Each rubber seal is allowed to be spliced at most two places, and the distance between the two splicing points is not
Should be less than 600mm.
5.13.3 Inspection of splice points
Test each splice point of the rubber seal one by one, and extend the rubber seal to more than twice the original length and twist 360° during inspection.
After the visual inspection, if the splicing point of the apron is disengaged or the crack should be discarded.
5.13.4 Apron storage
Rubber seals should be stored in a dry, cool place away from direct sunlight.
6 Tube technical requirements
6.1 Product Design
6.1.1 The structural design of prestressed steel cylinder concrete pipe shall comply with the provisions of GB 50332-2002 and CECS140.2011;
The design of the pipe can also be carried out by other design specifications.
6.1.2 Allowing by increasing the thickness of the core, the thickness of the steel cylinder, the strength level of the concrete design or by changing the basic form of the pipe, the central angle of the pipe base
Pipelaying is carried out using conditional parameters to design the pipe structure to obtain an economical and reasonable pipe structure.
6.2 Manufacturing
6.2.1 Welding requirements
Manual arc welding, electric resistance welding or submerged arc welding can be used for socket steel ring welding, and submerged arc welding, electric resistance welding or dioxing sho...
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