A Subway Station Main Structure and Its Quadruple Arch PBA Underground Excavation Construction Method

Abstract

The invention discloses a main body structure of a subway station and a four-arch PBA underground excavation construction method thereof. The main body structure of the subway station includes a main body structure inside the station, a plurality of left piles, a plurality of right piles, three sets of center columns, middle plates and The main arch part is a quadruple arch; the construction method includes steps: pilot tunnel excavation and initial support; horizontal foundation and bottom longitudinal beam construction; side pile and central column construction; crown beam, top longitudinal beam and pilot tunnel Construction of the inner arch section; construction of the first and third arch sections; initial support and buckle arch construction of the second and fourth arch sections; construction of the secondary lining structure for the first and third arch sections; Construction of the secondary lining structure of the section; excavation of the upper part of the main structure of the station and secondary lining construction of the middle longitudinal beam, middle plate and side wall; earthwork excavation of the lower part of the main structure of the station and secondary lining construction of the bottom plate and the lower part of the side wall. The invention has the advantages of simple and convenient construction, fast construction progress, stable main structure of the formed subway station and good use effect.

Description

technical field [0001] The invention belongs to the technical field of subway station construction, and in particular relates to a main structure of a subway station and a four-arch PBA underground excavation construction method thereof. Background technique [0002] The "PBA method" uses small pilot holes to build piles and beams to form the main force-transmitting structure, and excavates the inner pit under the undercover arch cover. When the "PBA method" is routinely used to construct a subway station, it generally goes through eight main steps. The PBA method (also known as the hole pile method) for the construction of subway underground excavation stations was first applied and succeeded in the construction of the Tiananmen West Station of the Fuba Line of the Beijing Subway in the 1990s. It is a relatively new construction method. With the rapid development of urban rail transit, the PBA method has been widely used in the construction of Beijing Metro Xuanwumen Statio...

AI Technical Summary

Problems solved by technology

[0004] However, the PBA underground excavation subway stations currently used in China are basically one-column-two-arch or two-column-three-arch structures. After the construction of the main structure of the underground excavation station is completed, it is necessary to set up an air duct or equipment room with a larger area outside the main body. This increases the ground area required for construction, increases the workload of demolition and modification and the initial investment, and brings many uncertain factors in the construction period.

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