Prestressed anchorage device with replaceable anchorage and construction method of installation and cable replacement thereof

Abstract

The invention discloses a prestressed anchorage device with a replaceable anchorage. The device comprises a prestressed concrete anchorage part and a main cable strand connecting part used for being connected with a main cable strand. The prestressed concrete anchorage part comprises an embedded assembly and an anchorage cable strand, wherein the embedded assembly is composed of upper-end anchor backing plates, lower-end anchor backing plates, spiral bars and an embedded pipe. The embedded pipe comprises a separating diversion embedded pipe and a straight embedded pipe, wherein the separating diversion embedded pipe is formed by assembly welding of connecting pipes, round plates and n crooked steel pipes, and the separating diversion embedded pipe is connected with the upper-end anchor backing plates and the straight embedded pipe through the connecting pipes and the round plates at both ends respectively; n is an integer which is equal to or greater than 2 and less than or equal to 100. By means of the prestressed anchorage device with the replaceable anchorage, the defects of common prestressed anchorage devices of suspension bridge tunnel-type anchorages can be effectively overcome, anchorage is reliable, corrosion protection is superior, construction and monitoring are easy and convenient, replacement of multiple strands of finished cables can be conveniently achieved in the condition that operation of a bridge is not influenced, and thus the prestressed anchorage device with the replaceable anchorage is especially suitable for a tunnel-type anchorage system with a crooked channel.

Description

technical field [0001] The invention relates to a prestressed anchoring system, in particular to a replaceable anchorage prestressed anchoring device and a construction method for installing and changing cables. Background technique [0002] The anchorage system of large suspension bridges mostly adopts prestressed anchorage system. There are two types of prestressed anchorage systems commonly used in tunnel anchorage. One is the bonded anchorage system in which grout is poured into the prestressed tunnel. , one is a non-bonding single replaceable anchoring system in which anti-corrosion grease is poured into the prestressed channel. The length of the large-scale tunnel-type anchorage concrete body is generally long. The prestressed channels in the above two types of anchorage systems are generally provided with curved sections, and the direction of each prestressed beam is changed through the curved section to reduce the prestressed beams. The divergent size in the anchor ...

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Problems solved by technology

[0008] In order to solve the above problems, the applicant has successively applied for a patent publication number of CN104372738A, and the title of the invention is "A Single Interchangeable Anchor Prestressed Anchoring Device and Its Installation and Cable Replacement Construction Method", and the patent publication number is CN104947589A. Two invention patent applications named "Multi-Strand Finished Cable Anchor Prestressed Anchorage Device and Its Construction Method" have the following disadvantages: the pre-embedded pipes are all straight pre-embedded pipes, which are not suitable for bending The situation of embedded pipe

However, the length of the existing large-scale tunnel-type anchorage concrete body is generally longer, and each bundle of prestressed channels is generally provided with a curved section. The divergent size, thereby reducing the size of the entire anchor concrete body, reducing the amount of construction and reducing costs; and in the two invention patents with patent publication numbers CN104372738A and CN104947589A, the pre-embedded pipe part is a straight pre-embedded pipe, which cannot be changed. Direction of prestressing beams, not applicable

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