Carst region double-arch road tunnel construction method

Abstract

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...

AI Technical Summary

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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