Bridge underpinning supporting structure and construction method

Abstract

The invention relates to a bridge underpinning supporting structure and a construction method. The bridge underpinning supporting structure comprises an expansion bearing platform connected with embedded steel bars of an original bearing platform, a plurality of transversely arranged stand column steel pipe piles arranged on the expansion bearing platform, and a bearing device arranged at the topsof the plurality of stand column steel pipe piles, a plurality of supporting structures are arranged between the stand column steel pipe piles and an original pier column, the bearing device comprises a transverse bearing beam arranged at the tops of the stand column steel pipe piles, the stand column steel pipe piles are connected through inclined struts and horizontal connection pieces, and theexpansion bearing platform is located on the side span side of the original bearing platform in the bridge central axis direction. Steel bars are planted on a bearing platform of an original pier, pouring of the expansion bearing platform is conducted, so that the stress area of the original bearing platform is increased, the stability of the underpinning supporting structure is guaranteed, and meanwhile, pile foundations have no need being excavated again; and in addition, the distance between the underpinning supporting structure and the original pier is short, so that the construction difficulty is lowered, meanwhile the supporting structures are arranged between the original pier and the underpinning supporting structure, and after a beam body falls onto the underpinning supporting structure, the stability of the underpinning supporting structure is guaranteed.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a bridge underpinning support structure and a construction method. Background technique [0002] In the prior art, the pile foundation underpinning method utilizes the original bridge piers to form a new stress system by constructing new pile foundations, underpinning caps, jacks and underpinning beams, and then implements the removal of old pile foundations. The excavation of the middle foundation pit is large, the risk is high, the cost is high, the construction is difficult, and the old pile foundation cannot be pulled out. The pile foundation underpinning method can also be used to build the underpinning support structure on the cap of the new bridge pier. If it is used in the renovation of the old bridge, the location of the new bridge pier is far away from the old bridge pier, resulting in the need to use more The construction of the underpinning support struct...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the above technical problems, especially the difficulty and high cost of the construction of the underpinning support structure in the renovation of the old bridge, the following technical solutions are proposed:

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