Foundation pit structure and construction method thereof

Abstract

The embodiment of the invention discloses a foundation pit structure and a construction method thereof. The foundation pit structure comprises a first-stage foundation pit, a second-stage foundation pit, a third-stage foundation pit, a supporting unit, a first-stage basement, a second-stage basement and a third-stage basement, wherein the first-stage foundation pit and a rail transit are arrangedin a spaced manner; the supporting unit is arranged in a soil layer on the side, close to the first-stage foundation pit, of the rail transit; the second-stage foundation pit and the third-stage foundation pit are arranged between the first-stage foundation pit and the supporting unit side by side; the first-stage basement comprises a plurality of supporting piers, a first-stage bottom plate, a first-stage middle plate and a first-stage top plate; the plurality of supporting piers are fixedly arranged on the first-stage middle plate and the first-stage top plate correspondingly; the second-stage basement comprises a second-stage bottom plate, a second-stage middle plate and a second-stage top plate; the third-stage basement comprises a third-stage bottom plate, a third-stage middle plate and a third-stage top plate; and the supporting piers and the supporting unit can serve as the two ends of a temporary support correspondingly. The foundation pit structure and the construction methodthereof have the beneficial effect that the construction cost is low.

Description

technical field [0001] The application relates to civil engineering, in particular to a foundation pit structure and a construction method thereof. Background technique [0002] With the popularization of rail transit (such as high-speed rail, train, urban rail, etc.), the number of foundation pit projects adjacent to rail transit is increasing. Because rail transit has extremely strict requirements on foundation displacement and settlement, taking high-speed rail as an example, the high-speed rail only allows mm Therefore, the foundation pit structure next to the high-speed railway generally adopts the support method of bored piles or underground diaphragm walls combined with multiple inner supports to prevent the deformation of the high-speed railway foundation during the foundation pit construction. However, foundation pit structures vary in size. For large-span foundation pits next to rail transit, if horizontal temporary supports are set directly in the foundation pit, ...

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Problems solved by technology

[0003] In view of this, the embodiment of the present application expects to provide a foundation pit structure and its construction method to solve the problem of high engineering cost

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