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Dismounting method for metro section segments intruding into tunnel gauge

A segment removal and segment technology, which is applied in tunnels, tunnel linings, underground chambers, etc., can solve the problems of poor soil quality at the top of the buried depth of the tunnel, narrow working space, and easy collapse, etc., to achieve fast demolition and safety accidents The effect of low efficiency and easy operation

Inactive Publication Date: 2016-10-12
THE THIRD ENG CO LTD OF THE HIGHWAY ENG BUREAU OF CCCC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Dismounting method for metro section segments intruding into tunnel gauge
  • Dismounting method for metro section segments intruding into tunnel gauge

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Effect test

Embodiment Construction

[0019] 1. Hollow out the back of the segment, and the hollowing depth is about 500mm, so that a cavity gap of 50mm-100mm is formed between the segment and the surrounding rock.

[0020] 2. Remove a segment ring bolt, and drill a hole (the first hole) along the longitudinal seam with a water mill drill. The hole position is 500 mm away from the segment removal direction (longitudinal direction), the hole diameter is 30 mm to 50 mm, and the hole depth is greater than the segment thickness. Drill a hole (the second hole) along the same circumferential section of the whole segment as the first hole, and the hole position is 500mm away from the direction in which the segment is removed.

[0021] 3. The first hole and the second hole are inserted into the cutting wire saw, and the wire saw is wound on the driving wheel and the auxiliary wheel. Start the wire saw cutting machine, and the wire saw runs around the cutting surface to grind and cut the pipe piece to complete the circular...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/00E21D9/10E21D11/08
CPCE21D9/00E21D9/10E21D11/00E21D11/08
Inventor 吴琼吴伟张磊张历男杨洁
Owner THE THIRD ENG CO LTD OF THE HIGHWAY ENG BUREAU OF CCCC
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