Underpinning method for existing continuous bridge

Abstract

The invention discloses an underpinning method for an existing continuous bridge. The method comprises the following steps: supporting the bridge by using a concrete-filled steel tube arch and a new support below the existing bridge, arranging jacks on two sides of the new support, arranging skewbacks on skewbacks of the concrete-filled steel tube arch, adopting a cast-in-situ bored pile foundation below the skewbacks, and connecting the skewbacks by a prestressed concrete straining beam, connecting the concrete-filled steel tube arches through steel webs, jacking up the existing bridge through the jacks, enabling box girders to fall onto new supports through the jacks after piers of the existing bridge are cut, and transmitting bridge loads to the skewbacks through the concrete-filled steel tube arches and finally transmitting to the pile foundations. By adopting the method for underpinning the bridge, the influence on the existing bridge in the construction process can be effectively reduced, the settlement deformation of the existing bridge in the underpinning process can be effectively controlled, the bridge reinforcing effect is ensured, normal driving of the existing bridge is not influenced, and the method has good popularization and application value for underpinning construction of the small-span continuous bridge.

Description

technical field [0001] The invention relates to the technical field of continuous bridge construction, in particular to an underpinning method for an existing continuous bridge. Background technique [0002] At present, urban construction is developing rapidly, and many engineering constructions are carried out on existing structures. In order to solve the problems of foundation treatment of existing buildings, bearing the impact of adjacent new constructions, and the need to construct underground works under existing buildings, bridge underpinning technology emerged as the times require. There are various forms of bridge underpinning technology, among which there are few underpinning methods for open excavation foundation pits located under existing bridges, and there are still deficiencies that need to be improved. How to effectively control the settlement and deformation of existing bridges in the process of bridge underpinning to ensure safety and reliability while main...

AI Technical Summary

Problems solved by technology

There are various forms of bridge underpinning technology, among which there are few underpinning methods where the open excavation foundation pit is located under the existing bridge, and there are still deficiencies that need to be improved

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