Method for constructing branch guide pits of tunnels

A construction method and technology for tunnels, which are applied to tunnels, tunnel linings, and earth-moving drilling and mining, etc., can solve the problems of large horizontal displacement, large construction safety risks and impacts, and achieve the effect of preventing arch collapse and ensuring no safety production accidents.

Inactive Publication Date: 2015-09-23
XIHUA UNIV
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Problems solved by technology

The disadvantages of using the double-side-wall pilot-pit method are: 1. For shallow-buried long-span tunnels, especially in areas where the surrounding rock is relatively broken, the construction of the double-side-wall pilot-pit method is likely to caus...

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  • Method for constructing branch guide pits of tunnels
  • Method for constructing branch guide pits of tunnels
  • Method for constructing branch guide pits of tunnels

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Embodiment Construction

[0054] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0055] The technical principle of the sub-pilot method of the present invention: based on the theory of rock mass mechanics, the construction method of the sub-pilot method is summarized by adopting the principle of the new Austrian method, that is, the excavation section of the cavern is divided into an annular arch, left and right side pilot pits , the four parts of the central core soil. The principle of determining the size of the pilot pit can be flexibly arranged according to the actual situation on site. The size of the annular arch is suitable for the convenience of construction operations. The general height is about 2m. The width of the left and right pilot pits should not exceed 1 / 3 of the maximum span of the section, and the shape should be close to an ellipse The staggered distance between the left and right pilot pits should be determined accord...

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Abstract

The invention discloses a method for constructing branch guide pits of tunnels. The method includes steps of (1), carrying out preparation work; (2), constructing advanced pipe sheds and small guide pipes; (3), carrying out ring-type excavation on arches; (4), primarily supporting and temporarily supporting the arches; (5), excavating and supporting left and right guide pits; (6), excavating core soil and inverted arches; (7), primarily supporting the bottoms of the tunnels; (8), pouring and filling the inverted arches; (9), secondarily lining the tunnels. Compared with the prior art, the method for constructing the branch guide pits of the tunnels has the advantages that the arches of the large-span shallow-buried tunnels with fractured surrounding rock can be prevented from collapsing, and full construction procedures are in safe, stable and quick controllable states; the good rate of the engineering quality can reach 95% at least, and safety production accidents can be assuredly prevented.

Description

technical field [0001] The invention relates to a construction method, in particular to a construction method for tunnel subdivision pilot pits. Background technique [0002] my country has a vast territory with large surface undulations. About 75% of the land is mountainous or heavy hills, with an altitude difference of 5,000 meters. Most of the roads built in the 30 years after the founding of the People's Republic of China were winding around mountains or cutting slopes and digging deep, seriously damaging the ecological environment. Caused soil erosion and landslides, and even revived some ancient landslides. In the 1950s, there were only more than 30 road tunnels with a total length of 2,500 meters in my country. The construction has developed rapidly. During the "Ninth Five-Year Plan" period, 278,000 meters of new tunnels were built, and many extra-long tunnels were built, such as Zhongliangshan Tunnel, Jinyunshan Tunnel and Erlangshan Tunnel. With the in-depth developme...

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Application Information

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IPC IPC(8): E21D9/00E21D11/14E21D11/10
Inventor 舒志乐刘保县周少波
Owner XIHUA UNIV
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