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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 18365-2001 Technical conditions for hot-extruding PE protection high strength wire cable of cable-stayed bridge. The following main technical changes have been made with respect to GB/T 18365-2001:
——The term “inner damper" and its definition are added (see 3.1.6);
——The classification of cable is added (see 4.1);
——The model indicating method of cable and anchorage is modified (see 4.4; 4.2 of Edition 2001);
——The wire materials of zinc-aluminum alloy coating are added (see 5.2.1);
——The strength grade of high strength wire is added (see 5.2.1.3);
——The requirements of no relaxation and grade I relaxation of wire are deleted (see 4.5.1.7 of Edition 2001);
——The main performance indexes of high density PE sheath materials are modified (see 5.2.2, 4.5.2 of Edition 2001);
——The definition of anchoring filler strength is added (see 5.2.4.2);
——The definition and requirements for accessories of stay cable are added (see 5.2.6);
——The requirements of technological performance are modified (see 5.4; Clause 5 of Edition 2001);
——The test methods of materials are added (see 6.2);
——The watertight test of cables is added (see 6.3.4);
——The inspection for materials is deleted (see 6.1 of Edition 2001);
——The detail requirements of inspection rules are modified (see Clause 7, Clause 6 of Edition 2001);
——Other requirements are deleted (see Clause 8 of Edition 2001);
——The main technical parameters of cables with steel wire tensile strength of 1 570MPa are deleted, and the main technical parameters of cables with steel wire tensile strength of 1 770MPa, 1 860MPa and 1 960MPa are added (see Annex A; Annex A of Edition 2001);
——The weight of anchorage is deleted, the technical parameter tables for φ7mm and φ5mm anchorages are combined, and the nominal breaking load of the cable is used to indicate the specifications and models (see Annex B; Annex B of Edition 2001);
——The cross section diagram of cable body is modified, and its shape is changed from the original circular shape to approximately regular hexagon (see Annex C; Annex C of Edition 2001).
This standard was proposed by and is under the jurisdiction of the Ministry of Transport of the People's Republic of China.
The previous edition of this standard is as follows:
——GB/T 18365-2001.
Hot-extruded PE protection paralleled high strength wire cable for cable-stayed bridge
1 Scope
This standard specifies the classification, product structure, specifications and models, technical requirements, test methods, inspection rules as well as requirements of marking, packaging, transportation and storage of hot-extruded PE protection paralleled high strength wire cables for cable-stayed bridge.
This standard is applicable to the production, inspection and use of hot-extruded PE protection paralleled high strength wire cables for cable-stayed bridge.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method
GB/T 238 Metallic materials - Wire - Reverse bend test
GB/T 239.1 Metallic materials - Wire - Part 1: Simple torsion test
GB/T 470 Zinc ingots
GB/T 699 Quality carbon structure steels
GB/T 1839 Test method for gravimetric determination of the mass per unit area of galvanized coatings on steel products
GB/T 2972 Test method for uniformity of zinc coating on zinc-coated steel wire by the copper sulphate dip
GB/T 2976 Metallic materials - Wire - Wrapping test
GB/T 3077 Alloy structure steels
GB/T 4162-2008 Forged and rolled steel bars - Method for ultrasonic testing
GB/T 4237 Hot rolled stainless steel plate, sheet and strip
GB/T 4956 Non-magnetic coatings on magnetic substrates - Measurement of coating thickness - Magnetic method
GB/T 5796.1 Trapezoidal screw threads - Part 1: Profiles
GB/T 5796.3 Trapezoidal screw threads - Part 3: Basic dimensions
GB/T 5796.4 Trapezoidal screw threads - Part 4: Tolerances
GB/T 6402-2008 Steel forgings - Method for ultrasonic testing
GB/T 9352 Plastic - Compression moulding of test specimens of thermoplastic materials
GB/T 9439 Grey iron castings
GB/T 17101 Hot-dip galvanized steel wires for bridge cables
GB/T 20492 Zinc-5% aluminum-mixed mischmetal alloy-coated steel wire and steel wire strand
GB/T 22315 Metallic materials - Determination of modulus of elasticity and poissons ratio
CJ/T 297 High density polyethylene sheathing compounds for bridge cable
HG/T 3949 Masking tape
NB/T 47013.4-2015 Nondestructive testing of pressure equipment - Part 4: Magnetic particle testing
YB/T 036.7 General specifications for metallurgical equipment manufacturing - Forgings
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
hot-extruding PE protection high strength wire cable
wire strands made from high strength galvanized or zinc-aluminum alloy wires (hereinafter referred to as wires) which are tightly arranged according to regular hexagon or regular hexagon with missing angle with twist angle of 2° to 4°, based on the predetermined length and specification requirements, wrapped with high strength PE fiber band after twisting slightly to the left and then to the right and covered with hot-extruding high-density PE sheath outside the wire via a plastic extruder
3.1.2
finished cable
hot-extruding PE wire cables with both ends poured and anchorage installed
3.1.3
anchorage
anchor devices used to maintain the tension of finished cables and transfer the tension to bridge structures, divided into two types of anchorage at tension end and anchorage at fixed end
3.1.4
nominal breaking load of the cable
product of standard tensile strength of wire and nominal sectional area of steel wire tendon
3.1.5
accessories of stay cable
members that assist in the protection of finished cables
3.1.6
inner damper
devices installed in orifice of embedded pipe and are used for increasing the modal damping ratio of the hot-extruding PE protection high strength wire cable, forming damping points, absorbing and reducing the vibration energy of cables
3.2 Symbols
For the purposes of this document, the following symbols apply.
A——the sum of nominal sectional areas of all wires in a hot-extruding PE protection high strength wire cable (hereinafter referred to as "cable"), mm2;
E——the modulus of elasticity, MPa.
fptk——the standard tensile strength of steel wire, MPa;
L——the length of finished cable, m;
LCP——the length of cable when it bears tensile force P1, m;
Lg——the working length (the cable length in case of 20% over tension), m;
L0——the non-stress length of cable at reference temperature, m;
ΔL——the permissible error of cable length, m;
ΔLP——the change value of cable lengths corresponding to P1 and P2, m;
P——20% over tension of cables, kN;
Pb——the nominal breaking load of cable, kN;
Ps——the maximum measured load of cable, kN;
P1——the initial tension for testing modulus of elasticity of cable, N;
P2——the final tension for testing modulus of elasticity of cable, N;
σb——the breaking strength of cable, MPa;
ξ——the efficiency coefficient of cables under static load;
Δ——the temperature correction, m.
4 Classification, structure, specifications and technical parameters and models
4.1 Classification
4.1.1 According to the surface coating materials of wires, the cables are divided into the following types:
a) high strength galvanized wire, with code of Zn;
b) high strength galvanized zinc aluminum alloy wire, with code of ZnAl.
4.1.2 According to the tensile strength of wire, the cables are divided into the following types:
a) 1 670MPa;
b) 1 770MPa;
c) 1 860MPa;
d) 1 960MPa.
4.1.3 According to the wire diameter, the cables are divided into the following types:
a) 5mm diameter;
b) 7mm diameter.
4.1.4 According to the wire sheath structures, the cables are divided into the following types:
a) black single layer, with code of H;
b) double layer of black inner layer and colorful outer layer, with code of C.
4.2 Structure
4.2.1 Finished cable
The finished cable consists of an anchor cup, an anchor ring, a connecting cylinder, a cable body and the like, and the schematic diagram of structure is shown in Figure 1.
Keys:
1——anchor cup
2——anchor ring
3——connecting cylinder
4——cable body
Figure 1 Schematic diagram of structure of finished cable
4.2.2 Cable body
The cross section of the wire tendon is arranged in a regular hexagonal shape or a hexagonal shape with missing angle, the outer surface of the wire tendon is continuously right-handed wrapped with a high strength PE fiber band along the length direction of the cable, and a high density PE sheath is extruded outside. The sheath may adopt a black single-layer structure or a double-layer structure with a black inner layer and a colored outer layer. Wind-, rain- and vibration resistant measures such as wrapping spirals at the outer surface of the cable body should be adopted. See Figure 2 for the schematic diagram of cable structures.
Foreword i
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Classification, structure, specifications and technical parameters and models
5 Technical requirements
6 Test methods
7 Inspection rules
8 Marking, packaging, transportation and storage
Annex A (Normative) Main technical parameters of cables
Annex B (Normative) Main technical parameters of anchorage
Annex C (Normative) Cable section
