Supporting protection construction method of adjacent river foundation pit

Abstract

The invention discloses a supporting protection construction method of an adjacent river foundation pit. The supporting protection construction method of the adjacent river foundation pit comprises the following steps that (1) steel sheet pile construction is conducted; (2) cement soil is removed at the crown beam position, and earthwork around a crown beam is excavated; (3) crown beam and retaining wall construction is conducted; and (4) construction of a crown beam lower concrete inclined throwing support bracket is conducted, after support is completed, soil of the partial crown beam lowerconcrete inclined throwing support is unloaded to -500mm of the bottom of the inclined throwing support bracket, concrete dabbing at the interface position is conducted, the surface of a steel bar iscleaned, a mechanical joint is connected with the steel bar, a pre-embedded part is mounted, a scaffold fixing template is set up, concrete is poured through a pre-embedded PVC pipe, the micro-expansion concrete is poured to the top of the pre-embedded PVC pipe, after concretion of concrete of a inclined throwing support is completed, the scaffold fixing template is removed, that is, supporting protection construction of the adjacent river foundation pit is completed. According to the supporting protection construction method, the work efficiency is greatly improved, the construction period isshortened, the foundation pit risk is decreased, the rework phenomenon is avoided, and the quality of supporting protection construction is improved.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a construction method for foundation pit support near rivers. Background technique [0002] With the continuous development of my country's economy and the acceleration of urbanization, major cities have begun to build large-scale underground projects. Utilizing and developing underground space plays an important role in promoting the healthy development of urban economy and society. Deep foundation pit is an important part of underground engineering. How to ensure the safety of foundation pit during construction, solve leakage and ensure that surrounding structures are not affected are problems that must be considered and solved during construction. [0003] When the land utilization rate is getting higher and higher, and the distance between the edge of the foundation pit and the red line is getting tighter and tighter, the deep foundation pit is excavated in the...

AI Technical Summary

Problems solved by technology

[0006] (1) Construction of steel sheet piles: In order to solve the problem that the crown beam and retaining wall cannot be constructed due to quicksand under the high water level of the river, steel sheet piles are used to prevent quicksand. The steel sheet piles are made of 28a channel steel with a length of 6m. The distance between the steel sheet piles and the concrete The retaining wall is 300mm, and the steel sheet pile is inserted into the pile position by a manipulator. After the construction of the crown beam and the retaining wall is completed, and the strength of the concrete retaining wall reaches 70%, the steel sheet pile is removed;

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