Single-cable-replaceable type anchorage pre-stressed anchor device and installation and cable replacement methods thereof

Abstract

A single-cable-replaceable type anchorage pre-stressed anchor device comprises a pull rod, a front protection cover, a rear protection cover, anchor gear assemblies, a connector, a pull rod nut assembly, a front anchor backing plate, a rear anchor backing plate, spiral ribs, an embedded pipe and unbonded PF steel strands. The connector is installed on the front anchor backing plate. The front anchor gear assembly is installed on the end face of the connector, and the rear anchor gear assembly is placed under the rear anchor backing plate. The two ends of each unbonded PF steel strand are removed, the remaining part of each unbonded PF steel strand is wrapped by PE, the exposed parts of the upper ends of the unbonded PF steel strands are located in a sealed cavity formed by an anchor plate of the front anchor gear assembly and the front protection cover and anchored to the anchor plate through working clamping pieces, and the exposed parts of the lower ends of the unbonded PF steel strands are located in a sealed cavity formed by an anchor plate of the rear anchor gear assembly and the rear protection cover and anchored to the anchor plate through working clamping pieces. By pressing and ejecting inner sealing plates and outer sealing plates through screw rods and ejector rods, the diameter of through holes in the inner sealing plate and through holes in the outer sealing plate can be adjusted. A sealed cavity of the front anchor gear assembly, a sealed cavity of the rear anchor gear assembly, the sealed formed by the front protection plate and the anchor plate of the front anchor gear assembly and the sealed cavity formed by the rear protection plate and the anchor plate of the rear anchor gear assembly are filled with non-drying anticorrosive materials. The anchor device is reliable in use and low in cost, and installation construction and cable replacement construction are convenient.

Description

technical field [0001] The invention relates to a prestressed anchoring device and its construction method, in particular to a single replaceable prestressed anchoring device and its construction method for the anchorage of a suspension bridge. Background technique [0002] The anchorage system of large suspension bridges mostly adopts prestressed anchorage system. The existing prestressed anchorage system has two forms, one is the bonded anchorage system in which grout is poured in the prestressed tunnel, the other is the An unbonded single-root replaceable anchor system that is filled with special anti-corrosion grease in the channel. The current unbonded single-root replaceable anchor system mainly uses galvanized steel strands and thin epoxy-coated steel strands as pre-installed anchorage systems. Stress tendons, among which thin epoxy-coated steel strands with relatively superior anti-corrosion performance are the main ones. [0003] The utility model patent "Prestress...

AI Technical Summary

Problems solved by technology

The main defects are as follows: the construction technology is high, and the grease poured into the prestressed channel of the replaceable anchor system is in liquid state at present, the purpose is to facilitate the pouring and future grease replacement; but in this way, the tightness of the system High requirements are put forward for the construction. If there is a slight construction operation or inspection is not in place, the grease in the system will leak. This not only affects the appearance, but more importantly, some leakage is difficult to cure, which increases the operation and maintenance costs. ; The suspension bridges that have been built in the early days and applied the replaceable anchorage anchorage system, because of insufficient understanding of its sealing performance, the design and construction process are not meticulous, resulting in varying degrees of grease leakage in the anchorage system

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