Method for connecting initial support and large-diameter pipe shed during shed cover method construction

Abstract

The invention discloses a method for connecting an initial support and a large-diameter pipe shed during shed cover method construction. According to the method, the initial support of a side wall andthe pipe shed can be effectively connected together without providing an initial support on the top of a pilot tunnel during shed cover method construction. The connecting method comprises the following steps of arranging a connecting piece at the position, in the underground excavation pilot tunnel, of the bottom of the pipe shed, wherein the connecting piece comprises an arc-shaped supporting plate and a baffle, and the supporting plate is separately connected with the pipe shed and the baffle in a welded manner; a backing plate is arranged at the lower part of the connecting piece, and thebacking plate is a thick steel plate machined according to a design size, and the specific number is reasonably configured according to the distance between the pipe shed and an adjusting piece; theadjusting piece is arranged at the lower part of the backing plate, I-shaped steel or square steel can be selected as the adjusting piece according to different types of steel frames, and the adjusting piece is connected with the steel frame of the initial support through a bolt. According to the method, the bearing capacity of the large-diameter pipe shed is effectively exerted, the top of the pilot tunnel does not need to be provided with the initial support, the pipe shed and the initial support are formed into a whole, the stability in the pilot tunnel is ensured, the construction processes are few, quickness and simpleness are realized, the construction period is shortened, and material is saved.

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 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 buildings (s...

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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