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Construction method for replacement of tunnel secondary liner

A construction method and tunnel technology, which is applied in the direction of tunnel lining, tunnel, shaft lining, etc., can solve the problems of high safety risk and difficult construction of the second lining of the tunnel, so as to achieve high safety, speed up the operation cycle time, and ensure safety Effect

Inactive Publication Date: 2019-12-20
CHINA RAILWAY TUNNEL GROUP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a construction method for the replacement of the second lining of the tunnel, in order to solve the technical problems of difficult construction and high safety risk in the prior art of the replacement of the second lining of the tunnel

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  • Construction method for replacement of tunnel secondary liner
  • Construction method for replacement of tunnel secondary liner
  • Construction method for replacement of tunnel secondary liner

Examples

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Embodiment

[0062] Example: construction method for the replacement of the second lining of the tunnel

[0063] The implementation site is Tianding Expressway, a part of the east-west horizontal line of the national expressway-G30 Lianhuo Expressway. The TD3 standard Qinzhou Tunnel is located in the west of Guanzi Town, Tianshui City. It is a separated 4-lane expressway tunnel with 5 emergency stops There are 6 cross-holes for pedestrians and 5 cross-holes for vehicles. The starting and ending pile numbers of the uplink line are SK162+180~166+810, the total length of the tunnel is 4630m, and the maximum buried depth is 184m. The starting and ending piles of the downlink line are XK162+250~XK166+840, the total length of the tunnel is 4590m, and the maximum buried depth is 183.7m. Set up a φ6.7m ventilation shaft 25m to the left of XK164+750. The project started construction in October 2007 and opened to traffic in June 2011. The design speed is 80 km / h, the clear width of the tunnel is 10...

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Abstract

The invention discloses a construction method for replacement of a tunnel secondary liner, and aims at solving the problems that construction difficulty of replacement of the tunnel secondary liner islarge and safety risks are high. The construction method comprises the steps that liner strengthening work is carried out on the to-be-replaced secondary liner; an isolating damping groove is formedat the junction of the dismounted portion and the un-dismounted portion; before the secondary liner is dismounted, isolation grooves are formed in a dismounting zone and a reserve zone, and secondaryliner concrete and steel bars are all cut off; before a lining is dismounted, radial grouting strengthening is carried out in surrounding rock on the back of an arc wall; the secondary liner is dismounted, a strengthened bush arch is dismounted, and a preliminary support is reserved; if the thickness of the secondary liner is smaller than 2 / 3 of original design, the preliminary support is replaced, exploding and expanding excavation are carried out on the preliminary support in three stages, the secondary liner is restored, after the replacement length of the secondary liner or the preliminarysupport reaches 12 m, secondary liner concrete is applied again in time, and the secondary liner is applied according to 10.5 m / 1 set; and if the thickness of the secondary liner is larger than 2 / 3 of original design, the secondary liner is directly restored. The construction method provides reference and guidance significance for subsequent analysis and treatment of diseases of the same type.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a construction method for removing and replacing the second lining of a tunnel. Background technique [0002] With the advancement of urbanization, highways have largely relieved the pressure on transportation and provided convenience for people's lives. [0003] Along with the development of expressway construction, the number of expressway tunnels continues to increase. Many tunnels that have been built or are under construction in my country have problems such as secondary lining cracking, especially in loess tunnels in western my country, where the geological conditions are complex, the self-stabilization ability is poor, and factors such as incomplete construction technology cause secondary lining cracking, which reduces the reliability of the lining structure. Durability and bearing capacity are easy to be deformed or even damaged under the pressure of the surrou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D11/18E21D21/00
CPCE21D11/10E21D11/18E21D21/0026
Inventor 何开进李学刚张传军汪东京闫世巍秦小鹏齐保伟魏文慧
Owner CHINA RAILWAY TUNNEL GROUP CO LTD
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