Waterproofing device suitable for thermal expansion and cold shrinkage of a PE sheath outside a stay cable

Abstract

The utility model relates to a waterproofing device suitable for the thermal expansion and cold contraction of the outer PE sheath outside a stay cable, comprising a waterproofing umbrella, matching screw or bolt pairs and a sliding inner liner; The waterproof umbrella is left-right type, the joint is straight line or tooth shape or broken line, the two-half type waterproof umbrella is fixed by screws or bolts, and is connected to form an umbrella-shaped waterproof object; An upper end of that waterproof umbrella is fasten and fixed on a PE sheath out of the cable through screws or bolts, A sliding liner made of a material having a small sliding friction coefficient in contact with the sealing cylinder is installed in a mounting groove (III) in the lower part of the waterproof umbrella, The sliding liner can slide freely on the cable sealing cylinder with the thermal expansion and cold contraction of the PE sheath, so that the waterproof umbrella of the waterproof device can slide up and down with the thermal expansion and cold contraction of the PE sheath. The waterproofing device can play a waterproofing and sealing role at the transition outlet between the front end of the anchor and the outer PE sheath of the cable, and has the advantages of simple installation, long service life and guaranteed cable body life.

Description

technical field [0001] The invention relates to a waterproof device for the front end of a cable anchor, in particular to a waterproof sealing cover suitable for the transitional connection between a sealing cylinder of a cable anchor and a free cable body. Background technique [0002] The existing outer sheath of the cable is protected by HDPE, and the transitional connection between the cable anchorage sealing cylinder and the free cable body is usually sealed waterproofly with a heat-shrinkable sleeve or a heat-shrinkable tape (see Figure 10 ), to prevent the cable body from entering the rainwater through the transitional joint, and the heat-shrinkable sleeve or heat-shrinkable tape is fixed at this position, and there is no technical requirement that can adapt to the thermal expansion and contraction of the cable PE. At present, the cables of some bridges are due to The structural requirement is to connect the anchor point of the box girder through the tie rod, and the ...

AI Technical Summary

Problems solved by technology

[0004] 1. There is a gap between the device and the connection end of the cable body, which is sealed by extrusion and deformation by filling in the sealing strip, and the lower end is filled with the sealing strip and extruded and installed on the embedded pipe, which prevents the free sliding of the cable body from thermal expansion and contraction. There is internal stress inside PE, which will lead to accelerated aging and cracking of PE in severe cases, leading to water ingress in the cable body and shortening the life of the cable;

[0005] 2. The large end of the waterproof cover of the device needs to be installed on the pre-embedded pipe. When the PE of the cable body expands with heat and contracts with cold, the movement of PE will invalidate the seal of the small end of the waterproof cover, which cannot drive the movement of the waterproof cover, resulting in cable body water;

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