Unit assembly type equally divided displacement comb tooth bridge expansion device

Abstract

The invention discloses a unit assembly type equally divided displacement comb tooth bridge expansion device which is mounted in a bridge with the expansion amount greater than or equal to 1000 mm. The unit assembly type equally divided displacement comb tooth bridge expansion device comprises a left displacement box, a right displacement box, hinges, displacement box girders, a cross beam, a leftcomb tooth plate, a middle comb tooth plate, a right comb tooth plate and two groups of hinges, wherein the left displacement box, the right displacement box, the hinges, the displacement box girders, the cross beam, the left comb tooth plate, the middle comb tooth plate and the right comb tooth plate are fixedly connected to beam ends; the left comb tooth plate and the right comb tooth plate arerespectively and fixedly connected with the left displacement box girder and the right displacement box girder through high-strength bolts; the displacement box girders are respectively and fixedly connected with the left beam end and the right beam end; the middle comb tooth plate is fixedly connected with the cross beam; the cross beam is arranged on the displacement box girders; and at least one earthquake-reduction and seismic-isolation support is arranged below each of the left comb tooth plate, the middle comb tooth plate and the right comb tooth plate; two ends of the hinges are respectively hinged to the left displacement box and the right displacement box; the middles of the hinges are fixedly connected with the cross beam through hinge pins; sinusoid-shaped anti-sliding groovesare transversely formed in the upper surface of each comb tooth plate; and when the bridge stretches and retracts, the middle comb tooth plate is displaced in an equally divided manner relative to theleft comb tooth plate and the right comb tooth plate. By adopting the device, interference resistance is facilitated, the device is safe and noiseless, and the mounting process is convenient, time-saving and accurate.

Description

technical field [0001] The invention relates to a unit-assembled equidisplacement comb tooth bridge telescopic device, which belongs to the technical field of bridge engineering. Background technique [0002] The bridge expansion device is an important connecting part between the beam end abutments of road and railway bridges. It plays an important role in the expansion and contraction of the bridge end abutments, as well as waterproof, dustproof, shockproof and other performances. Its quality and performance will directly affect the entire abutment. The durability of bridges is an important part of highway and railway bridge construction. Since the bridge telescopic device is installed on the weak part of the abutment bridge deck at the beam end, and has been subjected to various natural environmental erosion effects, there will be multi-directional changes in the process of use, such as cold and hot expansion, longitudinal swing, and lateral swing relative torsion. Positi...

AI Technical Summary

Problems solved by technology

[0004] 1. The intersecting telescopic teeth of the large-displacement comb-shaped bridge telescopic device have limited tooth side clearance, and there is a mechanical contradiction of mutual interference when the large-displacement bridge rotates horizontally;

[0005] 2. The intersecting telescopic teeth of the large-displacement bridge telescopic device are too long, so there is a traffic safety problem of warped teeth when rotating vertically;

[0006] 3. In the existing comb-shaped expansion joints, the left and right combs are installed alternately on the left and right bridges. When the shrinkage is large in winter, the conca

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