Underground box culvert constructing method closely attached to pile foundation bearing platform

Abstract

The invention discloses an underground box culvert constructing method closely attached to a pile foundation bearing platform. A main structure of an underground box culvert is closely attached to edges of an existing bearing platform. The constructing method comprises the following steps: a boundary invading perpendicular supporting structure is constructed in a width dimension range of the bearing platform; earth excavation and horizontal supporting component erection are performed alternatively up to a designed height so that a foundation pit is formed; a reinforced concrete press plate is poured at the bottom of the foundation pit; the boundary invading perpendicular supporting structure is chiseled in a segmented mode from top to bottom, a soil blocking prefabricating beam is installed in a following mode, meanwhile, piecemeal support exchange is performed to horizontal supporting components and the operation is circulated till the bottom of the foundation pit; after an underground box culvert constructing bottom plate is poured, the horizontal supporting components are detached from bottom to top, side walls of the underground box culvert are poured with the soil blocking prefabricating beam serving as an outer side pattern plate and the two operations are performed alternatively; and a top plate of the underground box culvert is poured finally. The underground box culvert constructing method closely attached to the pile foundation bearing platform has the advantages that the foundation pit is supported effectively under the condition that a requirement for a space of the underground pit is satisfied, meanwhile influences on an existing pile foundation are controlled and normal operating requirements of an existing structure are satisfied.

Description

technical field [0001] The invention belongs to the technical field of underground engineering, and in particular relates to a method for constructing an underground box culvert close to a pile foundation cap. Background technique [0002] An airport MRT corridor is an underground box culvert structure. Due to environmental conditions and other constraints, the underground box culvert structure perpendicularly intersects with the existing overhead airport corridor and is close to the pile cap of the corridor. Moreover, due to the main structure of the underground box culvert and The edge of the cap is close to each other, and there is no space for the implementation of the vertical support structure system within the width of the cap, so other support methods must be considered for the soft soil layer, foundation components (piles and bearings) within the width of the cap. platform) and the connected upper corridor to ensure the safe and normal use of the upper corridor and ...

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Problems solved by technology

[0003] According to the above working conditions, the technical scheme of underpinning the cap can be selected, but the underpinning scheme has the disadvantages of needing to widen the cap, occupying underground space, and making it more difficult to implement the underground box culvert due to the widening of the cap. This scheme is not suitable for use in this project

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