GB/T 19685-2017Prestressed concrete cylinder pipe (English PDF)

3.1 Terms and definitions

3.1.1 Prestressed steel cylinder concrete pipe (PCCP)

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 Lined prestressed steel cylinder concrete pipe (PCCPL)

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 Embedded prestressed steel cylinder concrete pipe (PCCPE)

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 Single apron prestressed steel cylinder concrete pipe

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 Double apron prestressed steel cylinder concrete pipe

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

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

Non-standard pipe fittings manufactured in the same process as prestressed steel cylinder concrete pipes.

3.1.8 Spiral welding

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

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

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

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);

Sigma pe --- the ultimate effective pre-stressing of the hoop wire in units of cattle per square millimeter (N/mm²);

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);

alpha --- control mortar cracking coefficient, 1.06 for PCCPE; 0.65 for PCCPL;

Omega c --- The inner side of the pipe wall is subjected to the elastic deformation resistance coefficient of the tensile edge concrete.

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.

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. […]

5.1 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.

6.1 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 […]