Rack type bridge expansion device

Abstract

The invention discloses a rack type bridge expansion device which comprises racks, an anchoring component, a displacement box, a cross beam, an H-shaped middle beam, an H-shaped lateral beam, a pressure spring I, a support I, a pressure spring II, a support II, a sliding frame and a waterproof adhesive tape, wherein the two ends of the cross beam are pre-pressed in the displacement box through the pressure spring I and the support I; the sliding frame is pre-pressed on the cross beam through the pressure spring II and the support II; the H-shaped lateral beam is integrally fixed with the displacement box; the H-shaped middle beam and the sliding frame are integrally connected through a bolt; the H-shaped middle beam can move by following the sliding of the sliding frame on the cross beam; the racks are arranged in a staggered form; one ends of the racks are pre-pressed on the H-shaped middle beam through the bolts while the other ends are pre-pressed on the H-shaped lateral beam through the bolts. The H-shaped middle beam is in sliding connection with the cross beam through the sliding frame, so that the displacement can be realized by the rack type bridge expansion device. The rack type bridge expansion device has the advantages of stable running, small effect caused by impact force, low cost and strong capability of adapting to three-dimensional deformation of the bridge.

Description

technical field [0001] The invention relates to a rack type bridge expansion device, which is especially suitable for concrete girder and steel box girder bridges, and belongs to the technical field of bridge expansion joints. [0002] Background technique [0003] With the gradual increase of the country's construction scale in the field of highway bridges, there are more and more long-span bridges. As a key component of the bridge, the bridge expansion device must not only meet the expansion and contraction caused by the temperature change of the bridge superstructure, but also meet the needs of the three-dimensional displacement movement of the beam end caused by constant and live loads. At the same time, the existing "heavy-load, high-density" traffic conditions put forward high requirements on the reliability of the bridge expansion device. [0004] At present, there are two types of bridge expansion devices: modular expansion devices and comb-tooth expansion devices,...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a rack-type bridge expansion device with stable operation, small impact force, low cost, and strong ability to adapt to the three-dimensional deformation of the bridge, so as to solve the technical problems of the existing bridge expansion device

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