Improved double-side-wall pilot tunnel method for giving consideration to TBM empty pushing station crossing in advance in arch structure

Abstract

The invention relates to an improved double-side-wall pilot tunnel method for giving consideration to TBM empty pushing station crossing in advance in an arch structure. The improved double-side-wall pilot tunnel method comprises the following steps that a station body is constructed in a double-layer six-pilot tunnel excavation method, excavation and supporting are carried out according to the sequence of side division and layering till pilot tunnel rock masses on the lower middle portion are left, a temporary support serves as a bearing platform, the temporary support of the arch part is dismantled in a longitudinal segmentation and partition mode, secondary lining and middle plate structure construction is carried out, the space below the secondary lining and middle plate structure construction meets the TBM stepping station crossing requirement, after the TBM completes the civil engineering task, the remaining pilot tunnel rock mass is excavated and the temporary inverted arch primary support is closed in time; and the remaining temporary support is dismantled in a longitudinal segmentation and partition mode again, and an inverted arch and the side wall are molded from bottom to top and form an annular closed space with the arch part second lining. Compared with a traditional double-side-wall pilot tunnel method, it can be guaranteed that station main body arch structure construction and TBM empty pushing station passing are carried out at the same time, TBM shutdown waiting is avoided, it is not needed to perform tunneling first and then station, the pressure of the station civil engineering construction period can be obviously relieved, and the advantages of efficient, safe and continuous tunneling of the TBM are fully played.

Description

technical field [0001] The invention relates to the field of urban rail transit construction, in particular to an improved double-side-wall guide pit method in which the arch structure is first considered and the TBM pushes through the station. Interacting with each other, the whole machine of TBM can pass the station in a straight line, and give full play to the advantages of fast, efficient, safe and continuous excavation of TBM. Background technique [0002] The typical characteristics of urban subway projects are that the buried depth of the line is shallow and the distance between stations is short. The ratio can reach more than 75%. TBM (shield tunneling) is widely used in the construction of single tunnel and single track section of urban subway because of its fast, safe, efficient, green and environmental advantages. In order to ensure the continuity and high efficiency of TBM excavation, it is necessary to frequently face mechanical receiving and passing stations. ...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of mutual interference between the construction of the second lining of the main body of the subway station with the traditional double side wall pilot pit method and the TBM stepping through the station; The improved construction method of double-side wall guide pits that can be carried out synchronously when crossing the station can not only realize the smooth and on-schedule empty push and step-by-step passage of the TBM, but also ensure the safe and efficient completion of the civil construction tasks of the subway station

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