Construction method of horizontal support for ''OC''-shaped asymmetric double-arch tunnel

Abstract

The invention discloses a construction method of a horizontal support for an ''OC''-shaped asymmetric double-arch tunnel. The construction method comprises the following steps that S1, the upper halfsection of a right line ''O''-shaped large section is supported; S2, the lower half section of the right line ''O''-shaped large section is supported; S3, a right line ''O''-shaped large section tunnel lining is constructed; S4, the upper half section of a left line ''C''-shaped small cross section is supported; S5, the lower half cross section of a left line ''C''-shaped small cross section is supported; and S6, a left line ''C''-shaped small section tunnel lining is constructed. The construction method of the horizontal support for the ''OC''-shaped asymmetric double-arch tunnel has the advantages of reasonable design, low cost of tunnel, good construction quality, economic and environmental protection and the like, and can be applied to the field of tunnel construction.

Description

technical field [0001] The invention belongs to the field of tunnel construction technology, and in particular relates to a horizontal support construction method for an "OC" shaped asymmetrical multi-arch tunnel. Background technique [0002] In recent years, the multi-arch tunnel has been widely developed, and the tunnel design section is various. It is a long-span tunnel section form proposed with the rapid development of highway construction in my country, but its application in subway engineering is very rare. [0003] The difference in the structural form of the traditional multi-arch tunnel mainly depends on the form of the middle wall. According to the different section forms of the middle wall, the multi-arch tunnel can be divided into straight middle wall type and curved middle wall type, and the straight middle wall and curved middle wall can also be divided into integral type, hollow type and compound type. According to the structure setting, there are various f...

AI Technical Summary

Problems solved by technology

Or use the middle pilot tunnel method, that is, excavate the middle pilot tunnel and support first, pour the middle wall concrete after the middle pilot tunnel is penetrated, and then excavate the main tunnel. The excavation section of the pilot tunnel is small and the construction work surface is narrow , the construction progress is slow; the density of the concrete at the top of the middle wall is difficult to control, and the construction quality is difficult to guarantee; the middle pilot hole adopts temporary support, which needs to be removed when the main hole is excavated, resulting in a waste project, which is uneconomical

Or use the three-pilot method for excavation, but there are many construction procedures, there are multiple disturbances to the surrounding rock and the built structure, and the lining interval at different parts is long; when the process connection is unreasonable, it is easy to cause lining cracks and other diseases; tunnel construction cost High; not conducive to large mechanical operations

[0004] In the construction of subway "OC" shaped asymmetric double-arch tunnel with poor geological conditions, the central partition wall adopts an integral straight wall structure. When the main tunnel is excavated, it is necessary to set up horizontal partition support. The traditional central pilot tunnel construction cannot be used. Research and development of a new construction method

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