A connection method for the initial support and large-diameter pipe shed in the construction of shed cover method

Abstract

The invention discloses a method for connecting the initial support and the large-diameter pipe shed during the construction of the shed cover method, which can eliminate the need for the initial support of the top of the pilot tunnel during the construction of the shed cover method, and the initial support of the side wall It is effectively connected with the tube shed. The connection method includes setting a connecting piece at the bottom of the pipe shed in the underground excavation pilot tunnel. The connecting piece includes an arc-shaped supporting plate and a baffle, and the supporting plate and the pipe shed, and between the supporting plate and the baffle are welded and connected; the lower part of the connecting piece is a backing plate , the backing plate is a thick steel plate processed according to the design size, and the specific quantity is reasonably configured according to the distance between the pipe shed and the adjusting part; the lower part of the backing plate is the adjusting part, and the adjusting part can be I-shaped steel or square steel according to different types of steel frames; The adjusting part is connected with the initial supporting steel frame by bolts. The method of the present invention effectively exerts the bearing capacity of the large-diameter pipe shed, no initial support is required on the top of the pilot tunnel, and the pipe shed and the initial support are integrated to ensure stability in the pilot tunnel, less construction procedures, fast, simple, and economical duration and materials.

Description

technical field [0001] The invention relates to the field of underground cavern construction, in particular to a connection method for the initial support of grids and large-diameter pipe sheds in the construction of the shed cover method. Background technique [0002] With the rapid development of economy and urbanization in recent years, the development and utilization of urban underground space has become the focus of the development of large cities in my country at present and in the future. The subway has become a very important mode of transportation for urban rail transit. At the same time, due to the complex environment of underground space, especially in densely populated areas, the development of underground space usually has to face old and dilapidated buildings, underground pipelines, environmental Protection and avoidance of nuisance and many other issues. How to ensure that under the premise of safe construction, minimize the disturbance to surrounding buildin...

AI Technical Summary

Problems solved by technology

[0005] In the existing technology, most projects adopt the dynamic construction method of small-diameter pipe shed (pipe diameter is only 79-129mm) and grid arch frame with short footage to control the settlement; , due to the complexity of the surrounding environment of the station, small-diameter pipe sheds are no longer suitable for this type of project, and there is no report on the connection between large-diameter pipe sheds and the initial support of the pilot tunnel

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