Initial launching tunnel door capable of being fast exploded in shield method connection passage construction

Abstract

The invention discloses an initial launching tunnel door capable of being fast exploded in shield method connection passage construction. Tunnel opening duct pieces of the initial launching tunnel door are set to be assembled duct pieces; each tunnel opening duct piece consists of tunnel opening peripheral steel grating components and in-tunnel-opening composite layer components; the tunnel opening peripheral steel grating components have the same outside shapes and thickness as main tunnel duct pieces; a tunnel opening space for forming the initial launching tunnel door is reserved in the tunnel opening peripheral steel grating components; each of the in-tunnel-opening composite layer component is of a double-layer structure with an inner layer and an outer layer; the inner layer is a thin-layer steel grating component; the outer layer is a thin-layer concrete layer component; the in-tunnel-opening composite layer components are anastomotic in the tunnel opening space of the tunnel opening peripheral steel grating components; and the in-tunnel-opening composite layer components and the tunnel opening peripheral steel grating components jointly form the assembled duct pieces. The initial launching tunnel door has the advantages that the construction safety is ensured; and the work efficiency of a shield tunneling machine for cutting the duct pieces in the initial launching tunnel door position is greatly improved.

Description

technical field [0001] The invention relates to the technical field of shield tunneling method construction technology, in particular to a starting portal that can be broken quickly in shield tunneling method construction. Background technique [0002] The construction technology of the communication channel by the shield method is a new technology in the field of communication channel construction. It is to apply the tunnel construction technology of the shield method to the construction of the communication channel to ensure the safety and efficiency of the communication channel construction. The hole removal technology of this construction method is different from the open-type manual chisel removal method used in the previous communication channel construction to remove the segment, but uses the shield machine to configure the cutter head to cut the segment in a closed environment, and at the same time remove the cutting debris Discharge to complete the segment breaking ...

AI Technical Summary

Problems solved by technology

[0003] However, in actual construction, reinforced concrete segments of no less than C50 are generally used for the lining of urban subway conventional shield tunnels, and they are single-layer linings. The thickness of the segments reaches 300mm-400mm, and the segments are connected by steel bolts. The circle forms a tunnel. Due to the increase of concrete age, the concrete strength actually exceeds the design strength by more than 20%.

The work efficiency of this method is extremely low when removing the tunnel segments on the main line, and the excavation speed is lower than 1mm / min, which seriously affects the construction efficiency. Although the designer replaces the segmental reinforcement of the tunnel door to be cut with glass that can be cut with similar performance Fiber reinforcement, but it cannot greatly improve the work efficiency of the segment at the starting opening of the shield machine

[0004] The steel pipe sheet has been used in the construction of the existing communication channel, but the structure of the single-layer steel pipe sheet requires reinforcement of the soil behind the steel pipe sheet before the steel pipe sheet is removed; After a layer of steel pipe sheets, the soil behind it is directly volleyed, without a supporting structure, which is very dangerous and cannot meet the safety requirements

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