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Doubly curved arch construction method for enabling inclined shaft of soft rock tunnel to enter main tunnel

A construction method and double-curved arch technology, which are applied in tunnels, tunnel linings, shaft linings, etc., can solve problems such as hidden safety hazards, insufficient tunnel clearance, difficulty in secondary lining construction, etc., and achieve the effect of convenient construction and simple structure.

Active Publication Date: 2015-04-01
CHINA RAILWAY 12TH BUREAU GRP +1
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Problems solved by technology

Practice has proved that there are very few cases of successful construction using the "roof raising" method. Even if it is successful, it is realized in a tense atmosphere. However, the clearance of the tunnel is insufficient, leaving difficulties and safety hazards for the subsequent secondary lining construction

Method used

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  • Doubly curved arch construction method for enabling inclined shaft of soft rock tunnel to enter main tunnel
  • Doubly curved arch construction method for enabling inclined shaft of soft rock tunnel to enter main tunnel
  • Doubly curved arch construction method for enabling inclined shaft of soft rock tunnel to enter main tunnel

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with specific implementation.

[0033] A construction method for a double-curved arch in which an inclined shaft of a soft rock tunnel enters a main tunnel comprises the following steps:

[0034] 1) Inclined shaft 1: Excavate inclined shaft 1 and support it, and excavate an inclined shaft of at least 15m perpendicular to main tunnel 3. This section of inclined shaft 1 is a single-lane section, and both horizontal and vertical sides are orthogonal to the main tunnel , the plane is orthogonal, in order to minimize the surrounding rock stress at the intersection, and the support structure for entering the main tunnel 3 is simpler, the facade is orthogonal, for driving safety, before the vehicle enters the main tunnel, the vehicle is in a horizontal state, which is convenient for speed control .

[0035] 2) Pilot tunnel 2: Arrange the longitudinal plane of pilot tunnel 2 along the excavation contour of th...

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Abstract

The invention discloses a doubly curved arch construction method for enabling an inclined shaft of a soft rock tunnel to enter a main tunnel. The doubly curved arch construction method comprises the following steps that (1) the inclined shaft is constructed, wherein the inclined shaft is excavated and supported, the inclined shaft which is perpendicular to the main tunnel and is at least 15m is excavated, the inclined shaft is a single-lane cross section, and the horizontal surface and the vertical surface of the inclined shaft are perpendicular to the main tunnel; (2) a pilot tunnel is constructed, wherein the longitudinal surface of the pilot tunnel is arranged along the excavation contour line of the main tunnel; (3) the main tunnel is excavated through a three-step method within the range of one to double tunnel excavation widths in the entrance direction and the exit direction of the main tunnel. The doubly curved arch construction method has the advantages of being simple in structure, convenient to construct, and safe, reliable, economical and practical; safety risks caused by unreasonable and uncertain factors such as unreasonable cross sections of a supporting structure, unreasonable cantilever structures and disassembly of supporting points of previous supports are avoided.

Description

technical field [0001] The invention belongs to the technical field of soft-rock tunnel construction, and in particular relates to a construction method for a double-curved arch in which an inclined shaft enters a main tunnel in a soft-rock tunnel. Background technique [0002] Due to the need to speed up the progress of tunnel and underground projects, it is necessary to adopt schemes such as inclined shafts and horizontal tunnels to add new working faces to achieve the set goals, or due to the influence of terrain or the influence of ground buildings, it is necessary to adopt "another way" The method is to use inclined shaft or horizontal tunnel to enter the main tunnel. Usually, the newly opened working face will first choose the location with better geology, and generally choose the II and III surrounding rock section to enter the main tunnel, but sometimes there is no good surrounding rock to choose from. Due to the situation, we have to choose the plan of entering the ...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D9/14E21D11/00
CPCE21D9/00E21D9/14E21D11/00
Inventor 剧仲林
Owner CHINA RAILWAY 12TH BUREAU GRP
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