In-situ expansion construction structure and construction method of extra-large cross-section tunnel with increased working face inside opening
A construction method and technology of extra-large section, applied in tunnels, tunnel lining, earthwork drilling, etc., can solve the problems of high construction period requirements and high pressure to keep the passage, and achieve the effect of improving the construction progress and shortening the construction period.
Active Publication Date: 2018-01-02
CHINA RAILWAY 15TH CONSTR BUREAU GRP +3
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Problems solved by technology
[0004]The purpose of the present invention is to solve the problems of high pressure and high construction period requirements in the in-situ expansion project of municipal traffic tunnels, and to provide a method for increasing the opening from the existing tunnel interior. Construction Structure and Construction Method of In-Situ Expansion of Extra-Large Cross-section Tunnel at Working Face
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[0030] The features and application process of the present invention will be further described in detail below in conjunction with the accompanying drawings for easy understanding.
[0031] In the present invention, the in-situ expansion construction structure of the ultra-large cross-section tunnel with the inner opening increasing the working surface (such as image 3 , 4 shown), including the existing tunnel A and the first temporary steel sheath arch 31a and the second temporary steel sheath arch 31b arranged at intervals in the existing tunnel along the tunnel length direction, the first temporary steel sheath arch and the second temporary steel sheath arch Excavation of the surrounding rock in the existing tunnel between the two temporary steel arches forms a tunnel profile B with a super-large section. Primary support 41 is provided on the surface of the tunnel profile with a super-large section. System anchor 43.
[0032] Further, the above-mentioned radial system an...
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The invention relates to an in-situ extension construction structure and method for an extra-large-section tunnel with an opening formed inside to enlarge a working face. The in-situ extension construction structure is characterized by comprising an existing tunnel, a first temporary steel cover arch and a second temporary steel cover arch, wherein the first temporary steel cover arch and the second temporary steel cover arch are arranged in the existing tunnel in a spaced mode in the length direction of the tunnel, an extra-large-section tunnel outline is formed after surrounding rock is excavated out of the part, between the first temporary steel cover arch and the second temporary steel cover arch, of the existing tunnel, a primary support is arranged on the surface of the extra-large-section tunnel outline, and radial system anchor bolts are arranged in the radial direction of the extra-large-section tunnel outline. According to the in-situ extension construction structure and method, the opening is formed inside the existing tunnel to enlarge the working face in a city dense environment where it is not allowed to excavate a vertical shaft (inclined shaft) to enlarge a working face, the construction progress can be significantly accelerated, and the construction period can be significantly shortened.
Description
Technical field: [0001] The invention relates to a construction structure and a construction method of a mountain tunnel, in particular to an in-situ expansion construction structure and a construction method of an extra-large cross-section tunnel in which a working surface is added to an opening inside an existing tunnel. Background technique: [0002] With the rapid development of the national economy and the increasing traffic volume, many long-established municipal traffic tunnels can no longer meet the needs of road transportation, and must be expanded on the original site of the existing tunnels to achieve the corresponding service level. The in-situ expansion scheme usually includes the following two types: expanding a single-hole tunnel into a double-arch tunnel, or expanding a single-hole tunnel into a super-large-section tunnel. Compared with multi-arch tunnels, super-large cross-section tunnels face disadvantages such as large spans, complex support structure desi...
Claims
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IPC IPC(8): E21D9/01E21D9/14E21D11/00E21D11/18E21D11/10E21D20/00
CPCE21D9/00E21D9/14E21D11/003E21D11/10E21D11/18E21D20/00
Inventor 陈良兵王事成张红华李永山宋永乐关振长阮庆晶
Owner CHINA RAILWAY 15TH CONSTR BUREAU GRP