GB/T 32963-2016 in English

Standard Overview and Technical Background

GB/T 32963-2016 is my country's first special national standard for zinc-aluminum alloy coated steel wire cables, jointly drafted by Jiangsu Fasten Cable Co., Ltd. and other units. This standard fills the gap in the standard application of zinc-5% aluminum-mixed rare earth alloy coating technology in bridge cables, reflecting the technical demand for high-performance cables in my country's large-span bridge construction.

Analysis of core technical requirements

In-depth analysis of material properties

The standard requires that zinc-aluminum alloy coated steel wire must use sorbitized wire rods with sulfur and phosphorus content ≤0.025%. The unit mass of the coating is ≥300g/m², and no copper is hung after the copper sulfate test (4 times × 60s). Typical application case: The Hong Kong-Zhuhai-Macao Bridge cable-stayed cable adopts the standard 187 wire specification to achieve 50 years of maintenance-free protection.

Structural innovation and process control

Prefabricated parallel strands are arranged in a regular hexagonal pattern, with the positioning accuracy of the marker wire and the standard wire reaching 1/15000; Hot-extruded polyethylene cable requires a twist angle of (3±0.5)°, and a double-layer HDPE sheath is formed in one step. The anchor is made of 42CrMo alloy steel, and the compressive strength of the cold-cast anchoring filler is ≥147MPa.

Implementation suggestions and engineering applications

1. Strictly control the uniformity of the coating. It is recommended to use an inductively coupled plasma spectrometer (ICP) to sample the aluminum content
2. Cable strand pre-tensioning should adopt graded loading (0.1Pb per grade), and the loading speed should be controlled ≤100MPa/min
3. It is recommended to establish a data archive for the entire life cycle of the cable, recording key parameters such as initial elastic modulus and relaxation rate