A method for laying main cables of a flat-stayed cable bridge and the double-layer cable saddle used

Abstract

The invention discloses a laying method for a main cable of a flat tension cable bridge and an applied double-layer cable saddle. According to the laying method for the main cable of the flat tension cable bridge and the applied double-layer cable saddle, parts of middle clapboards of an original single-layer cable saddle are heightened to form a lower-layer cable saddle, an upper-layer cable saddle is clamped at the top of the lower-layer cable saddle through transverse clamping plates and a longitudinal clamping plate, and the bottom of the lower-layer cable saddle penetrates through a bottom plate and is fixed to a foundation through bolts. The specific installation sequence comprises that the lower-layer cable saddle is fixed to the foundation through the bolts; a lower-layer main cable is installed on the arc-shaped surface of a lower cable bearing plate of the lower-layer cable saddle; the upper-layer cable saddle is clamped at the top of the lower-layer cable saddle through the transverse clamping plates and the longitudinal clamping plate; and an upper-layer main cable is installed on the arc-shaped surface of an upper cable bearing plate of the upper-layer cable saddle. By means of the novel double-layer laying method for the main cable of the flat tension cable bridge provided by the invention, the application range is greatly widened, and the installation requirements for the main cable are met through the layered structure design of the cable saddle; meanwhile, the folding stress of a steel wire of the main cable is reduced, and the stability and the safety of the bridge are improved; the structure is simple, and installation is convenient.

Description

technical field [0001] The invention relates to a method for laying main cables of a flat-stayed cable bridge and a double-layer cable saddle used, belonging to the technical field of flat-stayed cable bridge structures. Background technique [0002] The flat-stayed cable bridge is a flexible bridge system with the main cable as the stress structure, the bridge deck is directly laid on the main cable, and the line shape of the bridge deck is basically consistent with the line shape of the main cable. The main cable of the flat-stayed cable bridge changes direction through the cable saddle, and then is anchored on the anchorage structure. The main cables of existing flat-stayed cable bridges are all single-layer structures, so the cable saddles are also single-layer cable saddles. A single-layer cable saddle is generally composed of a vertical mounting plate, a bottom plate, and a pulley. However, due to the small diameter of the cable-bearing surface of the pulley, it is ea...

AI Technical Summary

Problems solved by technology

A single-layer cable saddle is generally composed of a vertical mounting plate, a bottom plate, and a pulley. However, due to the small diameter of the cable-bearing surface of the pulley, it is easy to make the main cable steel wire bear a large bending strength, so the scope of application of the cable saddle is limited.

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