Bridge bearing platform structure capable of protecting underground structure and construction method thereof

Abstract

The invention relates to a bridge bearing platform structure capable of protecting an underground structure. A bridge adopts the bearing platform structure to span the underground structure. The bridge bearing platform structure is characterized in that a bearing platform is divided into an upper layer and a lower layer. The lower-layer bearing platform is divided into multiple blocks, and the blocks of the lower-layer bearing platform are connected through UHPC post-pouring strips. The upper-layer bearing platform is of an integral type pouring structure. A cushion layer is arranged at the bottom of the bearing platform, and a flexible isolation layer is arranged between the lower-layer bearing platform and the cushion layer. By the adoption of the bridge bearing platform structure, the deformation of the underground structure in the bridge foundation construction period can be effectively reduced, and the influence of the additional load and the deformation of a bridge foundation inthe operation period on the underground structure is also reduced. The bridge bearing platform structure can be widely adopted when the bridge spans a subway structure.

Description

technical field [0001] The invention relates to the technical field of bridge structure design, in particular to a bridge cap structure and a construction method suitable for protecting underground structures during foundation construction and bridge operation periods of bridges located above underground structures. Background technique [0002] At present, with the rapid development of urban construction, due to the limitation of urban construction sites, various construction projects will inevitably intersect and interfere with each other, especially the rapid development of rail transit and underground space, which has brought great challenges to the establishment of urban bridge foundations. Difficult. In order to avoid underground structures, the bridge needs to be crossed with a long-span structure, which increases project investment and construction difficulty. If a long-span structure is not used to span, a long cap is required to span the underground structure. In t...

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Problems solved by technology

[0002] At present, with the rapid development of urban construction, due to the limitation of urban construction sites, various construction projects will inevitably intersect and interfere with each other, especially the rapid development of rail transit and underground space, which has brought great challenges to the establishment of urban bridge foundations. Difficult, in order to avoid underground structures, bridges need to use long-span structures to span, which increases project investment and construction difficulty

If a long-span structure is not used to span, a long cap is required to span the underground structure. In this case, two problems are involved. One problem is that the excavation and unloading of the bridge cap foundation will cause the overall underground structure to float and laterally Deformation affects the safety of the structure; another problem is that the cap and the superstructure will generate additional loads on the structure, which will adversely affect the structure

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