Carst region double-arch road tunnel construction method
A technology for highway tunnels and construction methods, applied in tunnels, tunnel linings, underground chambers, etc., can solve the problems of cumbersome construction steps, long construction period, and large equipment investment, and achieve safe and reliable construction process, short construction period, and construction. simple steps
Active Publication Date: 2010-10-20
CHINA RAILWAY 20 BUREAU GRP +3
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Problems solved by technology
[0012] The technical problem to be solved by the present invention is to provide a construction method for double-arch highway tunnels in karst areas, which is reasonable in design, simple in construction, safe and reliable in construction process, flexible in construction mode, and short in construction period. The construction steps are greatly simplified, effectively solving many defects and deficiencies in the construction of double-arch tunnels in traditional karst areas, such as large equipment investment, long construction period, cumbersome construction steps, and high cost.
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[0061] Such as figure 1 Shown is a construction method for a double-arch highway tunnel in a karst area. The constructed double-arch highway tunnel is divided into three construction sections: the entrance section of the tunnel, the connecting section in the middle of the tunnel, and the exit section of the tunnel from the entrance to the exit of the tunnel, and includes The two left and right tunnel main tunnels bounded by the middle partition wall 1, the tunnel entry section and the tunnel exit section are weak sections with complex geological conditions and broken surrounding rock, and the middle connecting section is the surrounding rock with good surrounding rock conditions. rock solid section. In this embodiment, the constructed double-arch highway tunnel is spread out in a direction of nearly 270°, the starting and ending pile numbers of the left line are ZK274+579.849~ZK274+982.245, and the length is 402.396m; the starting and ending pile numbers of the right line are ...
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The invention discloses a carst region double-arch road tunnel construction method, which comprises the following steps; 1. carrying out construction preparation; 2. carrying out construction at channel openings; 3. adopting a three-pilot-tunnel method for constructing the channel inlet opening section, and adopting a step digging method for digging during the three-pilot-tunnel method construction; 4. adopting a middle-pilot-tunnel method for constructing the middle communication section of the channel, and adopting a full cross section method for digging during the middle-pilot-tunnel method construction; 5. adopting the three-pilot-tunnel method or the middle-pilot-tunnel method for constructing the channel outlet opening section, adopting the step digging method for digging when the middle-pilot-tunnel method is adopted for digging construction of the channel outlet opening section, and synchronously carrying out secondary lining construction from the front part to the back part in the digging construction process of the channel inlet opening section, the middle communication section of the channel and the channel outlet opening section. The invention has the advantages of reasonable design, simple and convenient construction, safe and reliable construction process, flexible construction mode, short construction period and greatly simplified construction steps, and effectively overcomes various defects during the traditional carst region double-arch road tunnel construction.
Description
technical field [0001] The invention belongs to the technical field of tunnel construction in karst areas, and in particular relates to a construction method for double-arch highway tunnels in karst areas. Background technique [0002] In recent years, with the development of highway construction, a large number of medium and short tunnel construction problems have been encountered in the construction of high-grade highways in mountainous areas. If ordinary separated tunnels are used, the clear distance of tunnels is required to be large, and the triangular transition area at the junction of roads and tunnels is relatively large. , when the line includes many medium and short tunnels, the line shape is poor and the land usage is also high. Due to the requirements of the plane alignment of the highway or the constraints of external conditions such as land acquisition, sometimes it is difficult to design the double tunnels of medium and short tunnels as separate tunnels, and m...
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IPC IPC(8): E21D9/00E21D9/04E21D11/38
Inventor 冀胜利谢江胜李林生程刚周传刚向明根罗志勇高龙飞魏永杰刘锋涛经莲李强
Owner CHINA RAILWAY 20 BUREAU GRP
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