Novel anchor grouting method for main cable strand of suspension bridge

Abstract

The invention relates to a novel suspension bridge main cable strand anchor grouting method, and belongs to the technical field of suspension bridges. Preparing a liquid zinc-copper alloy; the anchorage device penetrates through the prefabricated parallel steel wire rope strands; a casting mold is designed according to the size of an inner cavity of the anchorage device, and an inner cavity of the casting mold is subjected to finish machining; a sprue gate and an exhaust port are formed in the casting mold; sealing cover plates are respectively arranged at two ends of the casting mold; the prefabricated parallel steel wire rope strands are arranged in an inner cavity of the casting mold in a penetrating mode through a sealing cover plate after being divided; the prepared liquid zinc-copper alloy is poured into an inner cavity of the casting mold through a sprue gate, the casting mold is dismantled after cooling, and a prefabricated zinc-copper alloy casting body is formed; the pouring block and the exhaust block are removed, the prefabricated zinc-copper alloy casting body is polished, and a zinc-copper alloy casting body is formed; and the anchorage device is jacked to the zinc-copper alloy casting body, the zinc-copper alloy casting body is jacked and pressed, and the retraction value of the zinc-copper alloy casting body is checked. The phenomenon that the small end opening of the anchorage device is not compact in pouring is avoided, and zinc-copper alloy casting meets the requirement.

Description

technical field [0001] The invention relates to a novel method for filling and anchoring main cable strands of a suspension bridge, which belongs to the technical field of suspension bridges. Background technique [0002] At present, the suspension bridge has become the preferred bridge type for crossing traffic obstacles such as large rivers, straits and harbors due to its good mechanical performance, large spanning capacity, light weight, beautiful appearance, and good seismic resistance. Prefabricated parallel steel wire strands A certain number of steel wires are shaped into bundles in the factory, and then prefabricated anchors are installed at both ends, and zinc-copper alloy is cast in the anchors to form anchor heads to realize the main cable strands and on-site anchorage. system connections. [0003] The technology of prefabricated parallel steel wire strands realizes the industrialized and standardized production of the main cable strands and improves the erection...

AI Technical Summary

Problems solved by technology

However, the existing prefabricated parallel steel wire strand hot-casting anchor pouring technology still has the following problems: 1) The traditional zinc-copper alloy anchorage casting directly casts the zinc-copper alloy melt in the anchorage. The anchor needs to be preheated during the anchor filling process. During the casting process, the temperature of the zinc-copper alloy solution will also cause the temperature of the anchor to rise. However, because the anti-corrosion coating system of the anchor is not resistant to high temperature, the anti-corrosion coating of the anchor It can only be carried out on the anchorage filled with zinc-copper alloy. Since the anchorage is connected with the strands at this time, the painting operation generally needs to be carried out outdoors. The operation is difficult, and the temperature and humidity conditions of the painting are difficult to control. cannot be guaranteed

2) The traditional anchor filling method needs to pour zinc-copper alloy from the large port of the anchor cone cavity. Due to the small distance between the steel wires at the small port, the zinc-copper alloy will solidify before it flows into the small port, and there is a risk that the small port will not be densely filled

3) Due to the structure of the anchorage of the parallel steel wire prefabricated strands, the connection with the on-site anchorage needs to be considered, and the wall thickness of the small-end anchorage cast by the zinc-copper alloy cone is relatively thick, which causes the zinc-copper alloy at the small end to cool first, which is not conducive to Casting compactness of zinc-copper alloy

Especially for high-strength large-scale steel wire strand anchors, there is still a hidden danger that the amount of zinc-copper alloy casting cannot meet the requirements

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