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Five-hole excavation method for double-arch tunnel

A double arch and tunnel technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as collapse, affecting construction progress and project quality, and achieve the effects of ensuring stability, simple and convenient construction, and avoiding bias

Active Publication Date: 2020-04-28
CHINA RAILWAY 19TH BUREAU GRP 3RD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, a little carelessness during the excavation process may cause collapse, which will affect the construction progress and project quality.

Method used

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  • Five-hole excavation method for double-arch tunnel
  • Five-hole excavation method for double-arch tunnel
  • Five-hole excavation method for double-arch tunnel

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[0028] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are some, not all, embodiments of the present invention. The specific embodiments described here are only used to explain the present invention, but not to limit the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention belong to the protection scope of the present invention.

[0029] Such as Figure 1 to Figure 6 As shown, the five-hole excavation method of a double-arch tunnel provided by the present invention comprises the following steps:

[0030] A. Carry out earthwork excavation on the side slope of the cave entrance, and at the same time carry out the anchor cable, anchor rod frame beam and anchor...

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Abstract

The invention relates to the technical field of double-arch tunnel excavation and provides a five-hole excavation method for a double-arch tunnel. In the method, firstly, excavation of a middle pilottunnel is carried out, and then excavation of a left wall pilot tunnel and a right wall pilot tunnel is carried out. Due to the large spacing between the three pilot tunnels, through the analysis of the shear strain rate and the plastic zone situation before and after the excavation of the three pilot tunnels, the mutual influence of the three pilot tunnels during the excavation process is very small, so that the three pilot tunnels can be constructed in parallel and the primary support can be applied in time, a certain support structure is provided for the excavation of the double-arch tunnelin advance, and the excavation of a main tunnel of the left tunnel and a main tunnel of the right tunnel is facilitated. According to the five-hole excavation method for the double-arch tunnel, a side form trolley can be used as a temporary reinforced supporting structure of the middle guide tunnel, so that a supporting structure is effectively provided, the pressure of a primary support of the left tunnel on a middle partition wall is avoided, the stability of the middle partition wall is ensured, and the side form trolley can be drove out when the secondary lining is constructed after the primary support of the tunnel is integrally formed, and finally the double-arch tunnel is formed.

Description

technical field [0001] The invention belongs to the technical field of double-arch tunnel excavation, in particular to a method for excavating five holes of a double-arch tunnel. Background technique [0002] The double-arch tunnel is a double-span multi-arch tunnel that is installed in the section where the expressway passes through low mountains, short length, and inseparable uplink and downlink lines. It has the advantages of easy line selection, land saving, and environmental protection. In particular, more and more six-lane large-span double-arch tunnels will appear in mountainous and hilly areas with a large proportion of mountainous areas and complex terrain conditions. [0003] The surrounding rock geological conditions of the long-span double-arch tunnel are poor and complex, and it is more difficult to control the tunnel formation and the stability of the surrounding rock. Therefore, a little carelessness during the excavation process may cause collapse, which in ...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D11/00E21D11/10E21D11/14E21D20/00
CPCE21D9/00E21D11/00E21D11/102E21D11/105E21D11/14E21D20/00
Inventor 赵立财
Owner CHINA RAILWAY 19TH BUREAU GRP 3RD
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