A detachable U-shape primary support method combined with shed cover method construction

Abstract

The invention discloses a detachable U-shaped initial support method combined with the construction of the shed cover method. The method adopts the method of connecting the U-shaped steel frame with the large-diameter pipe shed. The U-shaped steel frame is easy to install and can be disassembled and repeated. Utilization, the construction period and materials are greatly saved, and at the same time, the bearing capacity of the large-diameter pipe shed is fully utilized, and there is no need for initial support on the top of the pilot tunnel, and it is combined with the advanced pre-support (large-diameter pipe shed) constructed in the previous sequence. The support system fully demonstrates the synergy of the tunnel support structure system. It provides a new idea for the collaborative optimization design of the tunnel support structure system. The combination of the pipe shed and the U-shaped initial support is as follows from top to bottom: large-diameter pipe shed, connectors, pads, adjustment parts, side wall steel frame (the steel is connected by bolts), locking foot anchor pipe, The bottom grid steel frame (the grids are connected by bolts).

Description

technical field [0001] The invention relates to the field of underground cavern construction, in particular to a detachable U-shaped initial support method combined with shed cover method construction. Background technique [0002] With the rapid development of our country's economy, the traffic conditions in the central urban areas of many cities are deteriorating day by day. In order to alleviate the traffic pressure, it is necessary to build urban subways, road tunnels, railway tunnels, and underground crossings under structures such as busy roads, railways, and existing buildings. Passages and other underground projects to ease traffic pressure, disperse passenger flow, facilitate pedestrians to cross the road, and solve the problem of "difficulty crossing the street" for pedestrians. How to ensure that under the premise of safe construction, minimize the disturbance to surrounding buildings (structures) and ensure the normal operation of surface traffic is an urgent pro...

AI Technical Summary

Problems solved by technology

[0004] 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 such projects

At the same time, the general tunnel primary support usually adopts a combined structure composed of shotcrete and steel frame or grid steel frame with bolt support, and the combination of large-diameter pipe shed and tunnel detachable U-shaped primary unprecedented

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