Gas-phase anti-corrosion cable body and gas-phase anti-corrosion steel strand inhaul cable

Abstract

The invention provides a gas-phase anti-corrosion cable body and a gas-phase anti-corrosion steel strand inhaul cable. The gas-phase anti-corrosion cable body comprises steel wires, a wrapping tape and a plastic sheath, a plurality of steel wires are twisted to form a steel strand, a plurality of steel strands are braided in a certain permutation and combination to form a cable strand, the wrapping tape is wound on the outer surface of the cable strand, and the plastic sheath is wound on the outer surface of the cable strand to form the gas-phase anti-corrosion steel strand inhaul cable. The outer surface of the wrapping tape is sleeved with the plastic sheath, the steel strands at the two ends are exposed outside, and a gas phase corrosion inhibition material is placed in the plastic sheath. The invention has the following beneficial effects: 1, the anticorrosion mechanism is clear, the technology is mature and reliable, the measures are simple and convenient, and the method is replaceable and convenient to implement; 2, steel wire damage or steel wire coating damage in the cable manufacturing process and corrosion prevention caused by wet air in the cable body can be naturally compensated; 3, inevitable corrosion conditions due to the characteristics of the structure can be improved, and full-section all-dimensional corrosion prevention can be achieved; and 4, on the basis of an existing inhaul cable body anti-corrosion technology, the anti-corrosion durability of the inhaul cable is prolonged through gas-phase corrosion inhibition and corrosion prevention.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a gas-phase anti-corrosion cable body and a gas-phase anti-corrosion steel strand cable. Background technique [0002] Steel strand stay cables of cable-stayed bridges are composed of cable bodies and anchorages. The composition of the cable body from the inside to the outside is as follows: steel wires coated with galvanized or epoxy resin on the surface, twisted into a bundle according to requirements, and finally braided into strands, and then set a plastic sheath on the strands to form the cable body. During bridge construction, plastic sheath tubes are set outside the cable strands to protect the cable strands and anchor heads. Although the surface of the steel wire is galvanized or coated with epoxy resin, and the outer layer is protected by two layers of plastic, the following situations inevitably exist: [0003] 1) For galvanized or epoxy sprayed steel wire, it is in...

AI Technical Summary

Problems solved by technology

[0003] 1) For galvanized or epoxy sprayed steel wire, it is inevitable that there will be local scratches on the zinc coating or resin coating during cable making, resulting in a decrease in the protection ability;

[0004] 2) Insufficient thickness of galvanized or epoxy sprayed steel wire, uneven thickness, cracks, pinholes and other defects in plating and coating, which cause corrosion resistance decline

[0005] 3) When the cable is made or the bridge is threaded, the plastic layer is damaged, which affects the anti-corrosion effect and reduces the anti-corrosion ability

However, the use effect of these anti-corrosion structures in actual engineering is often unsatisfactory, and it has become one of the hardest hit areas for cable corrosion diseases. The main reasons are:

[0008] A. The galvanized anti-corrosion ability is limited, the durability is insufficient, and the coating is partially scratched during the installation process, resulting in a decrease in the protection ability;

[0009] B. The method of repairing paint and applying anti-corrosion grease on the exposed parts can only be local anti-corrosion, which cannot solve the anti-corrosion durability of the entire anchor, let alone prevent the corrosion of the steel wire in the anchor;

[0010] C. When the embedded parts deviate, the structure is aging and cracking, the performance is degraded and the elasticity is reduced, and the sealing performance of the waterproof cover of the anchor is insufficient, the water will penetrate into the interior of the anchor to accelerate the corrosion of the anchor and also cause the corrosion of the steel wire of the cable body;

[0011] D. Filling the cable conduit with filling material will cause troubles for later inspection, maintenance and replacement, and the filling material will also cause gaps between the anchorage or the cable body and the filling material due to vibration, and rainwater will still seep in if the waterproof cover is not well sealed. Corrosion of anchorage and cable body steel strands or wires;

[0012] E. There is a large gap in the anchorage. When the heat expands and contracts with cold, the internal and external air exchange will bring in moist water vapor, which will cause the internal steel structure of the anchorage and the steel wire of the cable body to corrode.

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