Comprehensive earth excavation method for large-scale cover-excavation top-down T-shaped transfer subway station

Abstract

The invention discloses a comprehensive earth excavation method for a large-scale cover-excavation top-down T-shaped transfer subway station. The method includes the steps that an enclosure structure and piles of the transfer subway station are constructed, and a cover plate is placed on the upper end part of each pile; a negative layer of earthwork below the cover plate is excavated, and the negative layer of earthwork is divided into a plurality of excavation areas; the design entrance and exit of a negative first floor of the transfer subway station is transformed into a lateral soil outlet, and a vertical soil outlet is reserved in the cover plate; a trestle is arranged in an overhead mode, the excavated earthwork is piled around the trestle through an excavating machine, the earthwork is lifted to an earthmoving vehicle through a long-arm excavator on the trestle, and the earthwork is transported outwards through the lateral earth outlet or the vertical earth outlet; after excavation of the earth of the negative first layer is completed, the trestle is dismantled, and a main body structure of the negative first layer is constructed; and the steps are repeated until the construction of each layer of space is completed. The comprehensive earth excavation method for the large-scale cover-excavation top-down T-shaped transfer subway station has the advantages that the vertical and lateral soil outlets are arranged, and the muck transfer efficiency is improved through the method of fully utilizing the entrance and exit and matching with the construction trestle.

Description

technical field [0001] The invention belongs to an underground building construction structure, and in particular relates to a comprehensive earthwork excavation method for a large-scale cover-excavation T-shaped transfer subway station. Background technique [0002] In recent years, the cover, dig and reverse method has been successfully applied in the construction of large-scale subway transfer stations in the bustling downtown area of ​​the city. Compared with the traditional construction method, the cover-and-excavation method has the advantages of less impact on the surrounding environment, saving temporary foundation pit support, simplifying the foundation pit construction process, and shortening the interruption time of ground traffic, etc., which is better adapted to the construction of large-scale This requirement of the underground structure. [0003] Under normal circumstances, the foundation pit of the cover-and-excavation method is vertically excavated. However...

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Problems solved by technology

[0003] Under normal circumstances, the foundation pit of the cover-dig top-down method adopts the vertical excavation method, but the excavation efficiency of this excavation method is low, which seriously affects the construction period of the cover-dig top-down method.

Therefore, in view of the disadvantages of unstable excavation, low work efficiency and high cost in the current excavation method of cover-excavation method, those skilled in the art urgently need a high-efficiency excavation method.

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