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Construction method for treating karst development tunnel after passing through and supporting structure

A construction method and technology for supporting structures, which are applied in tunnels, tunnel linings, and earth-moving drilling and mining, etc., can solve the problems of increasing project cost, long isolating time, affecting tunnel construction progress, etc., so as to improve construction progress, be easy to implement, Avoid the effects of prolonged exposure

Pending Publication Date: 2020-12-08
CHINA TIESIJU CIVIL ENG GRP CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] After the excavation of karst tunnels, dry karst caves with a diameter of no more than 3m are often revealed on the vaults. At present, the method generally used to reveal karst caves on the vaults of such karst tunnels is to firstly treat the karst caves and continue tunnel construction after the treatment is completed; however, due to After the treatment is completed, the equal strength time is longer, which greatly affects the construction progress of the tunnel and thus increases the project cost

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  • Construction method for treating karst development tunnel after passing through and supporting structure
  • Construction method for treating karst development tunnel after passing through and supporting structure
  • Construction method for treating karst development tunnel after passing through and supporting structure

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Embodiment Construction

[0022] see figure 1 , figure 2 and image 3 In the present embodiment, the construction method of the karst developed tunnel passing first and then treating is aimed at revealing the karst cave 14 in the tunnel construction, adopting the construction method of first passing through and then treating; the vault revealing karst cave 14 refers to a dry karst cave with a diameter not greater than 3m ;Treatment after passing first means that when there is a cave revealed by the vault, the preliminary support is first set up for the cave 14 revealed by the vault, and the normal excavation of the tunnel is maintained under the premise that the security of the preliminary support is ensured; After the karst cave is revealed, the karst cave 14 revealed on the vault is treated by using the early stage support.

[0023] In specific implementation, the preliminary support includes:

[0024] At the position where the opening of the vault reveals the karst cave, at least two steel arche...

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Abstract

The invention discloses a construction method for treating a karst development tunnel after passing through and a supporting structure. It is characterized in that the construction method of treatmentafter passing through is adopted for a vault revealing karst cave in tunnel construction; when the vault revealing karst cave exists, firstly, an early-stage support is arranged for the vault revealing karst cave, and normal tunneling of the tunnel is kept on the premise that the safety of the early-stage support is guaranteed; and after the tunnel is normally tunneled and passes through the vault revealing karst cave, karst cave treatment is conducted on the vault revealing karst cave through the early-stage support. A tunnel face can be closed as soon as possible in the tunnel excavation process, the stability of the karst cave is guaranteed, and the tunnel construction period is shortened.

Description

technical field [0001] The invention relates to a construction method of a karst-developed tunnel, more specifically, a construction method and a supporting structure for revealing a karst cave at the vault of a karst-developed tunnel. Background technique [0002] There are a large number of hidden karst caves in areas where limestone is widely distributed, and the possibility of encountering karst caves is extremely high during tunnel excavation. It is extremely difficult to detect karst caves before construction, and the construction risk is extremely high. [0003] After the excavation of karst tunnels, dry karst caves with a diameter of no more than 3m are often revealed on the vaults. At present, the method generally used to reveal karst caves on the vaults of such karst tunnels is to firstly treat the karst caves and continue tunnel construction after the treatment is completed; however, due to After the treatment is completed, the equal strength time is relatively lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/18E21D21/00E21D11/10E21F15/00E21F15/06
CPCE21D11/10E21D11/18E21D21/00E21F15/005E21F15/06
Inventor 马传书陈文尹杨艳伟王军姚大闯凌峰
Owner CHINA TIESIJU CIVIL ENG GRP CO LTD
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