Retaining structure of foundation pit for main pier bearing platform of bridge at river bedrock on gentle slope and construction method thereof

Abstract

The invention discloses a retaining structure of a foundation pit for a main pier bearing platform of a bridge at river bedrock on a gentle slope. The retaining structure comprises a cofferdam building island and is characterized in that a water-stop curtain for steel sheet piles is arranged around the cofferdam building island and is composed of multiple steel sheet piles vertically arrayed side by side; side edges of adjacent steel sheet piles are occluded with each other in order to form a quadrangular water-stop curtain; the inside of the water-stop curtain of the steel sheet piles is provided with a support curtain for steel pipe piles; the support curtain for the steel pipe piles is composed of multiple steel pipe piles vertically arrayed side by side; the inside of the support curtain for the steel pipe piles is provided with angle steel crossbeams; and the angle steel crossbeams are closely attached to the inside of the support curtain for the steel pipe piles and welded with the steel pipe piles together in order to form a quadrangular crossbeam supporting and reinforcing support. The retaining structure of the foundation pit for the main pier bearing platform of the bridge at river bedrock on the gentle slope and the construction method thereof have following beneficial effects: water-stop and water-proof function of the foundation pit can be fulfilled; excavating construction of the deep foundation pit of the bearing platform in water and smooth construction of the part of the bearing platform can be ensured; safety of the foundation pit is ensured while construction speed and quality are improved; and construction cost is decreased.

Description

technical field [0001] The invention relates to a foundation pit support structure for building a bridge main pier cap on a gentle slope riverbed bed rock, in particular to a foundation pit support structure for building a bridge main pier cap on a gentle slope river bed bedrock and a construction method thereof. Background technique [0002] In the construction and construction of large-scale bridges in the field, it is often encountered in the construction of large-scale bridges and approach roads across rivers and rivers. The large-scale bridges have many main piers, and different main pier caps will be built in different positions. Different geographical locations, topographic features and geological structures. For example, when the main pier caps of bridges across rivers and rivers are constructed, some of the main pier caps will be built on the gentle slope riverbed across the river or river, especially the gentle slope riverbed near the river bank. At this time, the ...

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Problems solved by technology

[0005] The purpose of the present invention is to address the defects of the prior art, to provide a foundation pit support structure for building the cap of the main pier of a bridge on the bed rock of a gentle slope river bed, specifically to provide a structure for building the cap of the main pier of a bridge on the bed rock of a gentle slope river bed The foundation pit supporting structure and construction method thereof, the technical problem that the present invention solves is to build the foundation pit supporting structure of the main pier of the bridge on the gentle slope riverbed bedrock with complex topographical characteristics and geological and hydrological structures, and effectively realize the foundation pit support structure. Water and waterproof, to ensure the smooth construction of the deep foundation pit excavation of the submerged cap and the cap part, to ensure the safety of the foundation pit, improve the construction progress and quality, and reduce the construction cost

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