A liftable support system for a subway foundation pit and its lifting construction method

Abstract

The invention discloses a subway foundation pit lifting supporting system and a lifting construction method of the system. The system comprises horizontal supporting units which are horizontally supported between foundation pit bracing structures. The horizontal supporting units are evenly distributed in a parallel spaced manner in the length and height direction of a foundation pit, and each horizontal supporting unit comprises a horizontal supporting platform and lifting power units connected to the two ends of the horizontal supporting platform, the lifting power units are connected with the foundation pit bracing structures through guide rails, and the guide rails are arranged in a parallel spaced manner in the length direction of the foundation pit bracing structures. In the construction process, corresponding soil is excavated in a layered manner, the guide rails are used for descending the horizontal supporting units to the next design elevation through the lifting power devices, the rest can be done in the same manner, after the horizontal supporting units descend to the bottom layer, construction is finished. A large work face can be provided for allowing a backhoe excavator to have the work space, the lifting power units are used for being matched with the guide rails to complete lifting of the horizontal supporting units, and compared with mounting of conventional concrete or steel pipe internal supports, the system is more efficient, better in safety coefficient and more stable in structure.

Description

technical field [0001] The invention relates to the field of construction engineering, in particular to a subway foundation pit construction system and a construction method thereof. Background technique [0002] At present, the main support system used for subway foundation pits is mainly reinforced concrete and steel pipe support, especially the steel pipe support, and its horizontal spacing is often not more than 3m. Based on the long, narrow and rectangular plane shape of the subway station building, the earthwork excavation of the subway foundation pit is generally carried out by step-back excavation relay method. Due to the tight spacing of the horizontal supports and the small construction area, earthwork excavation machines often use excavation equipment with small bucket capacity to complete earthwork excavation through step relay, which greatly reduces the efficiency of earthwork excavation; on the other hand, When the steel pipe supports are hoisted one by one, d...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a liftable support system for a subway foundation pit and its lifting construction method, to solve the technical problem that the horizontal support of the foundation pit and the earthwork excavation cannot meet each other in time and space; and to solve the difficulty of construction and low efficiency , there are security risks

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