Underground vehicle base foundation pit construction method

Abstract

The invention relates to an underground vehicle base foundation pit construction method. A foundation pit is divided into a foundation pit group composed of a plurality of branch pits in the relative long side direction of the foundation pit; dividing the sub-pits in the foundation pit group into a first stage and a second stage at intervals, firstly constructing the sub-pits in the first stage, and then constructing the sub-pits in the second stage after the sub-pits in the first stage are excavated and backbuilt; and a main body structure is built back in each branch pit, the second support and the third support of each branch pit are located at the unified elevation and reserved in the building-back stage of the main body structure, and the main body structure is dismantled until top plates of all the main body structures in all the branch pits are closed and reach the design strength. The method has the advantages that technical reference can be provided for similar projects, and later construction can be effectively guided, so that the purposes of improving the construction efficiency, saving the construction cost, improving the construction quality and realizing refined projects are achieved.

Description

technical field [0001] The invention relates to the technical field of foundation pit construction, in particular to a foundation pit construction method for an underground vehicle base. Background technique [0002] At present, there are few cases of large-scale foundation pit projects in China, especially in soft soil areas. Due to the particularity of process requirements, the vehicle base is an industrial building with super large scale and ultra-high clearance. When the vehicle base is buried underground, it is an underground space with a larger buried depth. During the implementation of the project, it is necessary to fully consider the special design method of the foundation pit enclosure during the excavation and construction of the foundation pit. [0003] At present, most of the underground spaces in China are multi-storey basements, with vertical and horizontal walls staggered in the plane, and the vertical layers are arranged in layers. Its foundation pit suppo...

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Problems solved by technology

The vehicle base is placed underground, and its burial depth is usually as much as that of a conventional three-story basement, but it is a single-story basement with high clearance. Due to technological requirements, it is generally arranged in a frame structure, and the entire underground space of hundreds of thousands of square meters has no shear wall partitions The wall cannot effectively provide lateral stiffness during the back-construction stage, and cannot effectively transmit lateral earth pressure to adjacent foundation pits, that is, the foundation pit project brought by the underground vehicle base is a super-large-scale super-large clearance deep foundation pit project, and the foundation pit support system The layout plan needs to be specially designed, and there is no corresponding plan at present

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