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Dovetail section tunnel construction process

A technology of tunnel construction and technology, applied in tunnels, tunnel linings, shaft linings, etc., can solve the problems of difficult construction of dovetail railway tunnels and difficult to ensure safety, and achieve the reduction of environmental impact and damage, fast construction progress, and openness. The effect of small excavation work surface

Active Publication Date: 2015-08-12
CHINA RAILWAY 19TH BUREAU GRP 1ST ENG
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a dovetail tunnel construction technology, which solves the technical problem that the construction of a dovetail railway tunnel with a large span section of a double-track tunnel transitions into two separate tunnels through a double arch section. , thereby greatly improving the progress of tunnel construction in this situation, and solving the problem that safety is difficult to guarantee

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Embodiment Construction

[0026] A dovetail section tunnel construction process is carried out according to the following steps:

[0027] 1. Upper pilot tunnel 1 during excavation; initial support for upper pilot tunnel during construction Ⅰ;

[0028] 2. Excavation of the pilot tunnel and the lower pilot pit 2; construction of the initial support for the lower pilot tunnel of the intermediate pilot tunnel II;

[0029] 3. Construct the partition wall III; at the same time, install the temporary cross brace on the left side of the partition wall;

[0030] 4. Excavate the right upper pilot pit 3 after the concrete of the middle partition wall reaches the design strength; implement the initial support IV for the right upper pilot pit;

[0031] 5. Excavate the right middle pilot pit 4; implement the right middle pilot pit initial support Ⅴ;

[0032] 6. Excavate the right lower pilot pit 5; implement the initial support of the right lower pilot pit VI;

[0033] 7. Apply secondary lining VII to the right h...

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Abstract

The invention discloses a dovetail section tunnel construction process, relating to a railway tunnel construction process; the dovetail section tunnel construction process mainly aims to solve the problem of slow construction speed of the current dovetail section tunnel, and comprises the following steps: excavating a middle pilot tunnel top heading and constructing a middle pilot tunnel top heading primary support; excavating a middle pilot tunnel bottom heading and constructing a middle pilot tunnel bottom heading primary support II; constructing a middle partition wall III; meanwhile, installing a temporary transverse support on the left of the middle partition wall; excavating a right top heading and constructing a right top heading primary support IV; excavating a right middle heading and constructing a right middle heading primary support V; excavating a right bottom heading and constructing a right bottom heading primary support VI; constructing a secondary lining VII of the right pilot tunnel; evacuating a left top heading and constructing a left top heading primary support VIII; evacuating a left middle heading and constructing a left middle heading primary support IX; evacuating a left bottom heading 8 and constructing a left bottom heading primary support X; constructing a secondary lining XI of the left pilot tunnel. The dovetail section tunnel construction process has the advantage of rapid construction progress.

Description

Technical field: [0001] The invention relates to a railway tunnel construction technology, in particular to a dovetail tunnel construction technology in which a large-span section of a double-track tunnel transitions into two separate tunnels through a double-arch section. Background technique: [0002] At present, due to the direction of the line and geological reasons, in the design of tunnel engineering, it is often encountered in the design of the dovetail railway tunnel that the long-span section of the double-track tunnel passes through the double-arch section and transitions into two separate tunnels. The excavation of the arch section, the waterproof construction of the middle partition wall, the construction of the small spacing section and the controlled blasting technology, etc., have relatively high construction technical difficulties. Due to the special section structure, weak blasting, short footage, early closure, frequent measurement and other technical m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/10E21D20/00
Inventor 周卫霞
Owner CHINA RAILWAY 19TH BUREAU GRP 1ST ENG
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