Construction method of slant-well pulling into main tunnel for three-line long-span tunnel

A construction method, the technology of the main tunnel, which is applied in tunnels, tunnel linings, shaft linings, etc., can solve the problems of large gaps in section sizes between inclined shafts and main lines, and increased construction difficulty

Inactive Publication Date: 2018-01-19
SHENZHEN MUNICIPAL DESIGN & RES INST +1
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  • Abstract
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Problems solved by technology

[0002] In rock tunnels and underground engineering, the surrounding rock of the inclined shaft of the tunnel changes frequently,

Method used

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  • Construction method of slant-well pulling into main tunnel for three-line long-span tunnel

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Embodiment Construction

[0023] Such as figure 1 As shown, one of the embodiments provided by the present invention, the construction method of the inclined shaft of the three-line long-span tunnel into the main tunnel, comprises the following steps:

[0024] The first step: Excavate the inclined shaft to the junction of the main tunnel, set up reinforced support at the intersection of the inclined shaft and the main tunnel, set the portal frame at the end of the reinforced support, and install the connecting plate vertically on the portal frame;

[0025] Step 2: Use the pilot tunnel method to raise the roof upwards to enter the main tunnel, excavate the climbing pilot tunnel obliquely upwards to the same elevation as the vault of the main tunnel, and at the same time continue to construct the pilot tunnel horizontally until the left side of the main tunnel, so that the main tunnel The arch has a stable foundation;

[0026] The third step: the installation of the main line arch frame, and the initial...

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Abstract

The invention discloses a construction method of slant-well pulling into main tunnel for a three-line long-span tunnel. The method comprises following steps: first: excavating a slant well to junctionwith a main tunnel, installing a reinforcing support at the intersection of the slant well and the main tunnel, wherein the end of the reinforcing support is provided with a door frame which is vertically provided with a connecting board; second: entering the main tunnel through top brushing upwards by means of the pilot tunnel method, obliquely upward excavating the climbing pilot tunnel until the pilot tunnel is positioned at the same elevation with the main tunnel top, continuing construction of pilot tunnel to a left sideline of the main tunnel; third: installing main line arch and constructing primary support of the main tunnel; fourth: constructing the main line tunnel according to double side wall pilot tunnel method and timely supporting and protecting temporary support to form the double side wall pilot tunnel method construction technology. Reinforcing supports are installed at the intersection of the slant well and the main tunnel; the end of the reinforcing support is provided with a door frame which is vertically provided with a connecting board; the structure at the reinforcing intersection is stable, the structure is simple, the construction is convenient, safe andreliable, which effectively solves the problems that size difference between the slant well and the main line section is large and the construction is difficult.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method for an inclined shaft entering a main tunnel of a three-line long-span tunnel. Background technique [0002] In rock tunnels and underground engineering, the surrounding rock of the inclined shaft of the tunnel changes frequently, and the surrounding rock grades range from grade III to grade VI. The larger the gap, the more difficult the construction. Contents of the invention [0003] In order to overcome the above-mentioned problems, the present invention provides a safe excavation construction method for a three-line long-span tunnel inclined shaft entering a main tunnel under the condition of weak surrounding rock. [0004] The technical scheme adopted in the present invention is: [0005] The construction method of the inclined shaft entering the main tunnel of the third-line long-span tunnel includes the following steps: [0006] The f...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D11/10E21D20/00E21D11/14
Inventor 刘建国梁泽柔郭伟马晓宾王文通徐梁黎心海丁华兴张勇刘毅彭振李向阳
Owner SHENZHEN MUNICIPAL DESIGN & RES INST
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