Subway station body structure and four-joint-arch PBA underground excavation construction method thereof

Abstract

The invention discloses a subway station body structure and a four-joint-arch PBA underground excavation construction method thereof. The subway station body structure comprises a station inner body structure, multiple left piles, multiple right piles, three sets of middle columns, middle plates and body arches. The body arches are four-joint arches. The construction method comprises the steps of pilot tunnel excavation and primary support; horizontal base and bottom longitudinal beam construction; side pile and middle column construction; crown beam, top longitudinal beam and pilot tunnel inner arch section construction; first and third arch section primary support buckle arch construction; second and fourth arch section primary support buckle arch construction; secondary lining structure construction of first and third arch sections; secondary lining structure construction of second and fourth arch sections; excavation of the upper portion of the station inner body structure, and secondary lining construction of the middle longitudinal beams, the middle plates and the upper portion of the side wall; earth excavation of the lower portion of the station inner body structure and secondary lining construction of bottom plates and the lower portion of the side wall. The construction is easy, the construction progress is fast, the subway station body structure constructed and formed is firm, and the using effect is good.

Description

Technical field [0001] The invention belongs to the technical field of subway station construction, and particularly relates to a subway station main structure and a four-arch PBA undercut construction method. Background technique [0002] The "PBA method" uses small pilot tunnels to construct piles and beams to form the main force transmission structure. The inner pit is excavated under the undercut arch cover. When the "PBA method" is conventionally used to construct subway stations, there are generally eight main steps. The PBA method (also known as the hole pile method) was first applied in the construction of the Tiananmen West Station on the Fuba Line of the Beijing Subway in the 1990s, and it was a relatively new construction method. With the rapid development of urban rail transit, the PBA method has gradually been widely used in the construction of subway stations such as Xuanwumen Station, Wangfujing Station, Guomao Station of Beijing Subway, Qingnian Street Station of ...

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.

Images