Design method of deeply-buried PBA subway station section

Abstract

The invention relates to a design method of a deeply-buried PBA subway station section. The design method includes the following steps that a, a void is detected; b, a composite anchor rod pile (14) is driven on the ground; c, a large pipe shed (4) is applied; d, small pilot tunnels (2 and 3) are constructed; e, grille arch centers for the small pilot tunnels (2 and 3) are erected; f, initial supporting is conducted on the inner parts of the small pilot tunnels (2 and 3), and then side piles (5 and 6) are applied in the small pilot tunnels (2 and 3) correspondingly; g, a main body arch part (1) is excavated, initial supporting is conducted, and a secondary lining structure (9) is poured by concrete; h, a soil mass of a lower main body center (10) is excavated; i, a bottom plate (11), a side wall (12) and a middle plate (13) of a lower secondary lining structure of the lower main body center (10) are constructed; and j, an accessory structure is applied, and a complete station structureis formed. According to the method, the construction safety, the construction quality and the construction period can be ensured, the cost can be saved, and the construction efficiency can be improved; and section structure design is reasonable, the overall structure is stable, construction is easy and convenient, 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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