Sealing device for suspension bridge main cable anchoring system in-anchor-room cable ducts, and protection method thereof

Abstract

The invention discloses a sealing device for suspension bridge main cable anchoring system in-anchor-room cable ducts, comprising a cable strand bound by a plurality of high-strength galvanized steel wires, a cable duct for fixing the cable strand, and an anchor head, wherein an anchor bearing plate is arranged on the anchor head; a corrosion resistant sealant layer is arranged on the bottom of the in-anchor-room cable duct; a non-sulfurized non-drying corrosion resistant sealant layer is arranged in the middle of the in-anchor-room cable duct; and a polysulfide corrosion resistant sealant layer is arranged at a port of the cable duct on a front anchor face of an anchor room. A protection method of the main cable anchoring system in-anchor-room cable ducts is provided by the invention, and the corrosion resistant sealants poured on the bottom of the cable duct, and the non-sulfurized non-drying corrosion resistant sealants poured in the cable duct are polyisobutene non-drying sealants; the products are permanently-non-drying sealants, and are mixed with loose cables as a whole; when bridges shade by outside influence, the polyisobutene non-drying sealing pastes also are not separated from the steel wires in the cable ducts to form an entire sealing system.

Description

technical field [0001] The invention relates to a cable conduit sealing device in an anchor chamber of a main cable anchorage system of a suspension bridge and a protection method thereof. The system includes a cable conduit and an anchoring device for loose strands. Background technique [0002] Due to the large spanning capacity and beautiful shape of the suspension bridge, the construction of the suspension bridge has entered a period of rapid development in recent years. The main load-bearing component of the suspension bridge is the suspension cable, which is the lifeline of the whole bridge structure. It is generally made of steel with high tensile strength (steel wire, steel strand, steel cable, etc.), so the protection and anti-corrosion of the main cable system are crucial. important. Due to the space limitation of construction, the cable conduit part in the anchorage room of the main cable anchorage area can only be protected simply, and the ideal anti-corrosion e...

AI Technical Summary

Problems solved by technology

For method 1, although the dehumidification system can reduce the humidity in the anchor room, the space inside the cable guide is narrow, the air is not circulated, and condensed water is easily generated, and the dehumidification system cannot drain the water in time, so that the cable guide is in a humid environment for a long time , causing corrosion of the steel wire in the cable guide, thereby affecting the life of the entire main cable; for method 2, the paraffin and other oils and fats poured into the cable guide can only withstand the temperature of 60-70°C at the highest temperature. If exposed to the sun for a long time, it will A high temperature environment will be formed, which will lead to the dissolution and volatilization of oily substances, which will seriously affect the anti-corrosion effect of the cable guide and loose cable; for method 3, polyurethane foam forms an independent whole and cannot be combined with the loose cable in the cable guide As a whole, during the long-term use of the suspension bridge, if it is subjected to a large force and shakes, the foamed polyurethane will be severely damaged, thus affecting the anti-corrosion effect

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