A section design method of deep buried pba subway station

Abstract

A method for designing a section of a deep-buried PBA subway station, comprising the following steps: a. detecting the cavity; b. laying a composite anchor pile (14) on the ground; c. constructing a large pipe shed (4); d. constructing a small guide hole (2,3); e. erect the grid arch frame of the small pilot hole (2,3); f. carry out the initial support in the small pilot hole (2,3), and then in the small pilot hole (2,3) Construction of side piles (5, 6) respectively; g. Excavation of the main body arch (1), primary support, and concrete pouring of the second lining structure (9); h. Excavation of the lower main body center (10) soil; i. The construction of the bottom plate (11), side wall (12) and middle plate (13) of the lower second lining structure of the lower main body center (10); j. construction of auxiliary structures to form a complete station structure. The method can ensure construction safety, quality and construction period, and can save costs and improve work efficiency; and the section structure design is reasonable, the overall structure is stable, and the construction is simple and the use effect is good.

Description

technical field [0001] The invention belongs to the rail transit equipment industry, and relates to the technical field of underground structure engineering construction of urban rail transit vehicles, in particular to a method for designing a section of a deep-buried PBA subway station. Background technique [0002] At present, the construction technology level of large-span tunnels in China mainly includes open-cut method and shallow buried method. Among them, the shallow burial and underground excavation methods include the double-side wall pilot pit method and the "PBA" method used in large-span subway stations. However, these methods have different defects and limitations for construction environments with complex surrounding environments, dense underground pipelines, poor geological conditions, abundant groundwater, and large cross-sectional spans. [0003] 1. For the working conditions with a lot of ground traffic and underground pipelines, the open-cut method must c...

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Problems solved by technology

However, these methods have different defects and limitations for construction environments with complex surrounding environments, dense underground pipelines, poor geological conditions, abundant groundwater, and large cross-sectional spans.

[0003] 1. For the working conditions with a lot of ground traffic and underground pipelines, the open-cut method must carry out pipeline relocation and traffic evacuation during construction, so the construction is disturbed and the construction period is long; in addition, the temporary relocation of pipelines and the cost of land occupation high, poor economy

[0004] 2. The shallow-buried double-side-wall pilot pit method adopted is extremely unfavorable for the safety control of the pipeline above the structure and the surrounding environment for the construction environment with poor geological conditions, complex surrounding environment, and many underground pipelines, and the construction risk is high. It is difficult to guarantee safety from theoretical analysis

[0006] However, due to its wide application range, the PBA method is suitable for excavation of tunnels with poor strata, poor geological conditions, large spans, and strict ground subsidence requirements, and can reduce ground subsidence and remove temporary support with relatively small workload, simplifying The construction technology and work efficiency are relatively high, so it is applied in the construction of long-span subway stations, but it has not been applied to the construction of deep-buried tunnels

Moreover, it increases the floor area required for construction, increases the workload of demolition and modification and the initial investment, and at the same time brings many uncertain factors in the construction period.

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