Construction method of constructing subway station by using prefabricated lining combined with pba

Abstract

The invention disclose a construction method of building subway station with fabricated lining combination PBA, which is used to construct a small pilot tunnel the initial support; fabrication applies a bar foundation of a lower pilot tunnel, a upper pilot tunnel applies a side pilling, the outer side of the side The concrete backfilling is used between outer side of the side pilling and the pilot tunnel, a crown beam is moulded, a middle pilot tunnel steel pipe concrete the column is dug under the wall a pillar in the middle of the protective wall modifies the top girder; the excavation of the soil under the excavation arch is initially supported by the arch; modifies the arch of primary support, to step on the soil excavation, excavation to post crown beam elevation setting the first level support, down the steps the second earth excavation, construction of the second support, continue to stratified excavation to base; Using integrated mechanical equipment to assemble the arching; step five: pre-fabricated side panel and center board; assemble prefabricated roof arch; after the assembling backfill grouting; To form a complete station structure. The technical scheme has the advantages that the road traffic is not affected the environment pollution is small, the quality is reliable, the construction is quick, the overall stability of the station can be improved by fabricated component.

Description

technical field [0001] The invention relates to the technical field of underground construction engineering, and mainly relates to a construction method for constructing subway stations by using prefabricated components, and is especially suitable for the construction of subway stations in urban central areas. Background technique [0002] At present, the construction of subway stations can be carried out by open-cut method, shallow-buried underground excavation method or shield method, among which the open-cut method or shallow buried underground excavation method is more commonly used. Most of the subway stations are built in the center of the urban area, and the open-cut method is used for construction, and the urban roads need to be closed all day, which aggravates the problem of urban traffic congestion; the underground pipelines in the urban area are dense, and it is difficult to relocate; the foundation pit construction seriously pollutes the surrounding environment, a...

AI Technical Summary

Problems solved by technology

Most of the subway stations are built in the center of the urban area, and the open-cut method is used for construction, and the urban roads need to be closed all day, which aggravates the problem of urban traffic congestion; the underground pipelines in the urban area are dense, and it is difficult to relocate; the foundation pit construction seriously pollutes the surrounding environment, and the construction noise is harmful The life and work of the surrounding residents are greatly affected; these defects make the construction of the open cut method more disturbed, the construction period is long, and the overhead cost of the project increases

[0003] The traditional shallow buried excavation method or cover-excavation method, such as the PBA construction method, alleviates the ground traffic pressure and pipeline migration problems to a certain extent, but the primary support and secondary lining of this construction method need to be cast in-situ reinforced concrete underground, and the long The initial setting and final setting time affect the progress of the project, and there are defects such as long construction period, poor working environment, many safety risks, and difficult quality assurance.

The construction of subway stations using the shield method often needs to be used in conjunction with the shallow buried excavation method. The section form is single and the section size is relatively small. There are disadvantages such as poor ground adaptability and short-distance construction advantages cannot be brought into play in the construction of structures

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