Underground tunnel enlarging and excavating method from small section of single-line tunnel to large section of double-line tunnel
A technology for double-track tunnels and underground tunnels, applied in tunnels, tunnel linings, underground chambers, etc., can solve the problems of small impact on the surrounding environment, large impact on the surrounding environment, short construction period, etc., to reduce the excavation height, improve the Construction efficiency, the effect of reducing the surface subsidence
Active Publication Date: 2015-01-28
CHINA RAILWAY NO 2 ENG GRP CO LTD
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Problems solved by technology
[0007] The purpose of the present invention is to overcome the disadvantages of large impact on the surrounding environment, low safety factor and long construction period in the underground tunnel expansion method from the small section of the single-line tunnel to the large section of the double-line tunnel in the prior art, and provide a solution with little impact on the surrounding environment. An underground tunnel expansion method from a small section of a single-track tunnel to a large section of a double-track tunnel, which is safe and has a short construction period
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Embodiment 1
[0037] Embodiment 1 Take the excavation construction of an underground tunnel from a small section of a single-track tunnel to a large section of a double-track tunnel as an example, refer to Figure 1-9 , an underground tunnel excavation method from a small section of a single-line tunnel to a large section of a double-line tunnel, comprising the following steps:
[0038] (1) Advanced support transition section: refer to figure 1 , in the small section 1 of the upper guide pit of the single-line tunnel 1 / 2, along the upper arc side of the grid arch, set up small conduits for advance support at a distance of 300 mm, and radially grout to form 1 / 2 from the single-line tunnel to the double-line tunnel 2 Outline 2 of transitional section of upper pilot pit;
[0039] (2) Excavation expansion transition section: refer to figure 2 , in the outer contour line 2 of the transitional section of the upper guide pit from the single-line tunnel to the double-line tunnel, along the uppe...
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The invention discloses an underground tunnel enlarging and excavating method from a small section of a single-line tunnel to a large section of a double-line tunnel. The tunnel is enlarged and excavated in steps by combining a stepped method for construction with a CRD (Collision Resolution Device) digging method; and a large construction unit with a greater section is divided into a plurality of small construction units with smaller section by adopting a gradual enlarging and excavating method. The underground tunnel enlarging and excavating method comprises the following steps of: carrying out advanced supporting on a transitional section; enlarging and excavating the transitional section; carrying out advanced supporting on a first large section of one-second upper pilot tunnel of the double-line tunnel; enlarging and excavating the first large section of the one-second upper pilot tunnel of the double-line tunnel; digging the first large section of the one-second upper pilot tunnel of the double-line tunnel and carrying out advanced supporting on a second large section of the one-second upper pilot tunnel of the double-line tunnel; digging the second large section of the one-second upper pilot tunnel of the double-line tunnel; digging a first large section of a one-second lower pilot tunnel of the double-line tunnel; continuously digging the second large section of the one-second upper pilot tunnel of the double-line tunnel; and digging a second section of a lower pilot tunnel of a medium partition wall. According to the underground tunnel enlarging and excavating method disclosed by the invention, the construction efficiency is increased and the disturbance on rock is reduced, so that the mutation height becomes small, the influence on a surrounding environment is reduced and a high safety coefficient is obtained.
Description
technical field [0001] The invention relates to an underground tunnel construction method, in particular to an underground tunnel excavation method from a small section of a single-line tunnel to a large section of a double-line tunnel. Background technique [0002] During tunnel construction, it is often necessary to expand single-track tunnels into double-track tunnels in some road sections due to the increase in operating volume. At present, the excavation method for the changing section of the tunnel is mainly through blasting excavation, and the small section is directly expanded to the large section. This method has the disadvantage of relatively large disturbance to the surrounding rock mass. It is suitable for mountain tunnel projects with large buried depth and good geological conditions. For urban rail transit tunnel projects with poor geological conditions of surrounding rocks and rich underground water systems, There is a great security risk. [0003] In urban ...
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IPC IPC(8): E21D9/01E21D11/10
Inventor 王家祥陈强申遂
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD