Bridge expansion joint structure

Abstract

The invention discloses a bridge expansion joint structure. The structure is characterized in that for an expansion joint positioned between beam bodies in adjacent sections, the top plane of an expansion plate arranged in the expansion joint is lower than a bridge floor so as to form a concave platform; a replaceable pavement layer is arranged on the concave platform; the top surface of the pavement layer is enable to be leveled with the bridge floor; a supporting structure is arranged at the bottom of the expansion plate; the supporting structure adopts an arched supporting body erected between beam bodies on two sides of the expansion joint; all supporting rods are arranged on the arched supporting body; the expansion plate is supported by step surfaces, the supporting rods and the arched supporting body of the beam bodies on the two sides of the expansion joint; the arched supporting body and the supporting rods adopt steel structure pieces; the pavement layer adopts an elastic material layer. The structure can rapidly absorb kinetic energy after suffering impact load, effectively buffers the impact load, prolongs the service life, and improves the driving comfort.

Description

technical field [0001] The invention relates to a bridge expansion joint structure, which belongs to the technical field of bridge engineering. Background technique [0002] With seasonal and diurnal temperature changes, the middle girder structures of bridges such as simply supported bridges and continuous bridges experience thermal expansion and contraction. Therefore, it is necessary to set expansion joints between adjacent bridge panels to meet the expansion and rotation deformation of the bridge superstructure caused by temperature changes, concrete creep, dry shrinkage, and loads. Bridge expansion joints should have the characteristics of durability, waterproof and convenient construction, and should ensure driving comfort. [0003] In the prior art, the expansion joints widely used in bridge engineering include plate rubber expansion joints, TST expansion joints, and Moller expansion joints. Among them, the plate rubber expansion joint has simple structure, convenie...

AI Technical Summary

Problems solved by technology

Among them, the plate rubber expansion joint has simple structure, convenient installation and strong versatility, but its rigidity is small and easy to deform, the rubber parts are easily damaged, the anchor is easily damaged, and it is easy to cause the expansion device to sink; the TST expansion joint effectively avoids or slows down the bridge head jump. Vehicle problems, but the filler is easy to bulge and sag under the long-term impact load of the vehicle, resulting in greater driving impact, aging and falling off after long-term use, cracking and water seepage, and erosion of the bridge span structure; Maurer expansion joints are currently the best. An expansion joint with a long service life, its swallow-shaped rubber belt is easy to replace, and can meet a series of requirements such as expansion and water stop

But its expansion and contraction is too large, the rubber strip is cracked or extruded, and its section steel is prone to breakage

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