Fireproof, waterproof and shockproof protection device for bridge cable

Abstract

The invention relates to a fireproof, waterproof and shockproof protection device for a bridge cable. The protection device comprises an obliquely arranged pre-buried conduit (1); the cable (2) penetrates through the pre-buried conduit (1); an elongated steel pipe (3) is arranged above the pre-buried pipe (1); the elongated steel pipe (3) sleeves the cable (2); the elongated steel pipe (3) is connected with the pre-buried pipe (1) through a flange connecting piece (4); fireproof layers (5) are arranged in the pre-buried pipe (1) and the elongated steel pipe (3); and the length L of the elongated steel pipe (3) is equal to h/sin alpha-l, h is the fire source height of a vehicle, alpha is the included angle between the cable and a bridge deck, and l is the linear distance from the pre-buriedconduit flange connecting piece to the bridge deck. The protection device can ensure the stress safety of the cable in the design reference period, reduce the cable diseases, prolong the replacementperiod of the cable, reduce the later maintenance cost, and ensure the use safety of a bridge.

Description

technical field [0001] The invention relates to a fireproof, waterproof and shockproof protection device for bridge cables, belonging to the technical field of bridge cable protection. Background technique [0002] The cable is the key stress-bearing component of the bridge structure. Its cable body is mainly made of steel wire, steel strand or steel wire rope. When in use, the cable body is usually covered with extruded high-density polyethylene (HDPE). Cables are prone to the following diseases during use: [0003] 1. The main function of the cable HDPE sheath is to protect the steel wire, steel strand or steel wire rope from the invasion of external corrosive media and improve the anti-corrosion performance of the cable. However, HDPE is a flammable material and cannot play a role in fire prevention. In fire events such as automobile burning, the temperature field of the cable under huge tensile stress will rise rapidly. Under the action of fire and high temperature, th...

AI Technical Summary

Problems solved by technology

[0003] 1. The main function of the cable HDPE sheath is to protect the steel wire, steel strand or steel wire rope from the invasion of external corrosive media and improve the anti-corrosion performance of the cable. However, HDPE is a flammable material and cannot play a role in fire prevention. In fire events such as automobile burning, the temperature field of the cable under huge tensile stress will rise rapidly

Under the action of fire and high temperature, the elastic modulus of the cable will drop significantly, and the tensile performance will degrade rapidly, which may lead to accidents such as broken cables or overall collapse of the bridge, endangering the safety of people's lives and property;

[0004] 2. Due to the complex environment and stress conditions of the stay cables, the steel wire cables and anchorages are easily damaged by corrosion. Water and other phenomena will cause the steel wires of the cables to corrode, which will directly affect the structural safety and service life of the bridge;

Under the dynamic effect of wind force, the cables of long-span bridges sometimes fail due to the large vibration of the cables, which can have fatal consequences

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