Inclined tensioned cable fine-opening device for arch bridge

Abstract

The invention discloses an inclined tensioned cable fine-opening device for an arch bridge. The inclined tensioned cable fine-opening device for the arch bridge comprises an expansion piece, wherein the expansion piece comprises a left expansion piece and a right expansion piece, which have same structures; the left expansion piece and the right expansion piece are both provided with through holes; rubber steel rib pressing strips are arranged in the through holes of the expansion pieces; the left expansion piece is formed by splicing a first upper expansion body and a first lower expansion body; the first upper expansion body and the first lower expansion body are both provided with first bolt fixing holes for first bolts to be fixed; one end of the left expansion piece is provided with an external thread; one ends, with the threads, of the first upper expansion body and the first lower expansion body are provided with left half steel ribs; the right expansion piece is provided with right half steel ribs matched with the left half steel ribs of the left expansion piece; and the external sides of the threads of the left expansion piece and the right expansion piece are mounted with rotating bodies. According to the invention, arch rib elevation adjustment method is changed from tensioning force adjustment into displacement adjustment; and the arch rib elevation can be accurately adjusted to millimeters. Therefore, the inclined tensioned cable fine-opening device for the arch bridge, provided by the invention, has the advantages of safety, reliability, convenient operation and good effect.

Description

technical field [0001] The invention relates to the field of bridge engineering, in particular to a slightly tensioning device for cable-stayed buckles of arch bridges. Background technique [0002] The cable hoisting construction method is widely used in the construction of long-span arch bridges or continuous porous arch bridges because of its advantages such as large spanning capacity, flexible horizontal and vertical transportation, wide adaptability, and convenient construction. The main arch ring of an arch bridge is generally divided into 3 to 5 sections for prefabrication and hoisting. When closing the main arch ring, the hoisting arch box cannot be put in place at one time, and it is necessary to adjust the cable force and length of the cable to make the elevation of the joint point of each segment reach the design elevation for closing. At present, most of the instruments and equipment for adjusting the cable force and the length of the buckle use the hydraulic ja...

AI Technical Summary

Problems solved by technology

At present, most of the instruments and equipment for adjusting the cable force and the length of the buckle use the hydraulic jack system or the winch of the anchorage section of the cable stay. The use of the hydraulic jack system can only be adjusted by controlling the tension of the stay cable. It is difficult to control the adjustment value when controlling the elevation of the arch rib; although the hoist can adjust the elevation of the arch rib by adjusting the displacement of the arch rib, the minimum adjustment amount of the steel wire rope is about 50cm, and the error is large when finely adjusting the elevation of the arch rib

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