Dismounting method for metro section segments intruding into tunnel gauge

Abstract

The invention discloses a dismounting method for metro section segments intruding into a tunnel gauge. The method is characterized by comprising the following steps: 1) the back of one segment is hollowed out, and a cavity gap is formed between the segment and surrounding rock; 2) bolts in a circumferential direction of the segment are dismounted, a first hole is drilled by water grinding drill along the longitudinal joint, and a second hole is drilled in the same circumferential section with the first hole along the whole segment; 3) a cutting wire saw penetrates the first hole and the second hole and winds around a driving wheel and an assisting wheel, a wire saw cutting machine is started, the wire saw operates around a cutting surface and grinds the segment to complete circumferential cutting, the wire saw operating in the cutting process is cooled with water, and grinding debris is carried away; 4) the cutting direction is adjusted after the circumferential cutting is completed, the segment is cut in the longitudinal direction of the second hole, longitudinal cutting is completed, the wire saw cutting machine is removed, and accordingly, one segment is dismounted, and dismounting of the next segment is performed. According to the method, construction is easy to operate, the progress is fast, the efficiency is high, the accident rate is low, and only manual cleaning is required after construction is completed.

Description

technical field [0001] It involves the demolition of formed segments in the subway section. Background technique [0002] In the construction of underground tunnels, due to construction needs, the segments formed into the boundary of the tunnel are removed. The formed segment has a circular cross-section and a lining thickness of 350mm. It is a reinforced concrete prefabricated segment with high strength (C50 concrete) and a narrow working space. It is difficult to dismantle by conventional methods and takes a long time. Due to the shallow buried depth of the tunnel and the poor soil quality at the top, there is a risk of collapse if the whole area is demolished or the demolition footage is too long. In order to ensure the construction progress and safety quality, after dismantling some bolts, the tunnel segment was removed with a wire saw cutting machine. Contents of the invention [0003] A method for dismantling segments in a subway section for intruding into the tunn...

AI Technical Summary

Problems solved by technology

The cross-section of the formed segment is circular, and the lining thickness is 350mm. It is a reinforced concrete prefabricated segment with high strength (C50 concrete), and the working space is narrow. It is difficult to dismantle by conventional methods, and it takes a long time

Due to the shallow buried depth of the tunnel and the poor soil quality at the top, there is a risk of collapse if the whole area is demolished or the demolition footage is too long

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