Construction method of large-section tunnel

Abstract

The invention relates to the technical field of tunnel construction, in particular to a construction method of a large-section tunnel. The construction method comprises the following steps: zoning a section of a tunnel, wherein the section of the tunnel is zoned into a left upper zone, a left middle zone, a left lower zone, a middle upper zone, a middle middle zone, a middle lower zone, a right upper zone, a right middle zone and a right lower zone according to the upper-middle-lower direction and the left-middle-right direction; during excavation construction on the nine zones, firstly carrying out the excavation construction on zones at the left side and the right side of the tunnel, wherein the excavation construction is carried out on the zones at the left side and the right side of the tunnel from top to bottom, and primary support is carried out in time; then carrying out the excavation construction on the zones at the middle part of the tunnel, wherein the excavation construction is carried out on the zones at the middle part of the tunnel from top to bottom, and primary support is carried out in time. A closed loop is formed as section steel supporting frames are arranged around the outlines of all the zones, so that the structure of the tunnel is stable, safety construction can be ensured, the cost of temporary engineering is reduced, all zones can be subjected to synchronous construction, the operation of various machines is facilitated, the working efficiency is increased, the construction progress is quickened, and the construction of accessory structures such as an entrance / exit and an air duct is convenient.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method for a large cross-section tunnel. Background technique [0002] In the process of urban subway tunnel construction, in order to ensure the safety and construction speed of tunnel construction, sub-regional and stepped excavation methods are generally adopted. In the prior art, the division of tunnel excavation areas is generally divided into horizontal and vertical sections from top to bottom. Steps in the direction, when excavating, the area divided in the horizontal direction is excavated from top to bottom, excavated into steps from top to bottom, and gradually pushed forward, although the construction of super-large cross-section tunnels in the prior art can be To improve the tunnel excavation efficiency, however, the above-mentioned area division will appear unreasonable, and the excavation sequence in the upper and lower directions will int...

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Problems solved by technology

[0002] In the process of urban subway tunnel construction, in order to ensure the safety and construction speed of tunnel construction, sub-area and stepped excavation methods are generally adopted. In the prior art, the division of tunnel excavation areas is generally divided into horizontal and vertical sections from top to bottom. When excavating the steps in the direction, the area divided in the horizontal direction is excavated from top to bottom, excavated into steps from top to bottom, and pushed forward step by step. Although the construction of super-large cross-section tunnels in the prior art can Improve the excavation efficiency of the tunnel. However, the above-mentioned area division will appear unreasonable. The excavation sequence in the upper and lower directions will interfere with each other more often, resulting in the overall tunnel construction is still too slow, and in the case of mutual interference construction, there will be There are certain security risks

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