Over tensioning and tension-releasing structure for stay cable cable-force

Abstract

The invention discloses an over tensioning and tension-releasing structure for stay cable cable-force. The over tensioning and tension-releasing structure for the stay cable cable-forc is characterized in that a guiding pipe (1) is pre-embedded in partition wall saw-tooth block concrete (2) in a box girder, and an anchoring cylinder (3) extends into the guiding pipe (1) during the tensioning construction of the segment stay cable, and a guiding pipe anchoring plate (4), a work anchor (5) and an adjusting nut (15) are slightly attached by the tensioning force of the stay cable without gaps, before the over tensioning of the stay cable, whether an anti-loosening device connecting bolt (6) is tightened or not is confirmed. During the over tensioning and tension-releasing of the stay cable, afastener-type bracket platform is erected right below the partition wall saw-tooth block concrete (2) in the box girder, and a steel supporting tension platform seat (7) is arranged and fixed above anoperation platform by a chain block. After the steel supporting tension platform seat (7) is installed, a cross-core jack (8), a tool anchor (9) and an oil pump are installed. The cross-core type jack (8) is hoisted and installed by an auxiliary hanging bracket and a chain block to enable the jack (8) to directly face to the steel supporting tension platform seat (7).

Description

technical field [0001] The invention relates to an overtension and release structure of a cable-stayed cable. Background technique [0002] The Gangou Bridge on China Railway Avenue is a "Lusheng" shaped cable-stayed bridge. In order to better optimize the line shape and the stress on the upper and lower edges during the construction stage of the bridge, and improve the service life of the bridge, before the cable-stayed bridge is closed, the design requires that each cable-stayed cable The tension of the single roof is temporarily stretched to 0.46fpk of the cable force of the cable stay, and the overtension release structure is used to overtension the cable force of the cable stay to 0.65fpk before the closure of the bridge. After the conversion of the prestressed system of the whole bridge is completed, the The cable force of the stay cables is over-tensioned to 0.72fpk, and then the force of the stay cables is released to 0.56fpk by using the over-tension release structu...

AI Technical Summary

Problems solved by technology

The traditional front-clip single-drawn roof needs to realize the overtension and release adjustment of the cable stay, which is difficult to operate and has low economic benefits, and the single roof adjustment is likely to cause damage to the PE epoxy-coated steel strand of the stay cable. Therefore, a cable-stayed cable force super-relaxation structure has been developed.

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