Construction method of temporary support for tunnel face of rear hole of double-arched tunnel

Abstract

The invention provides a construction method of temporary support for a tunnel face of a rear hole of a double-arched tunnel. Disturbance of rear hole construction to primary support and a secondary lining of a front hole which generally occurs to the front hole is effectively controlled by changing the construction method and sequence of the rear hole and reducing or avoiding the disturbance frequency, range and duration to the constructed front hole, so that the mechanical properties of surrounding rocks are closer to the design, and the quality of the primary support and the secondary lining of the front hole is guaranteed to meet the design and specification requirements. Meanwhile, mechanical crushing is adopted in an area adjacent to the primary support of the front hole, the mechanical crushing effectively ensures that the primary support of the front hole is not damaged, and can effectively control over-excavation and under-excavation of earthworks, thereby ensuring that a steel arch of primary support of the rear hole can be normatively connected with a steel arch of the primary support of the front hole strictly according to the designed and specification requirements. The construction quality of the completed front hole is not affected while ensuring the construction quality of the rear hole, so that the overall quality of the tunnel is guaranteed.

Description

technical field [0001] The invention discloses a construction method for the temporary support of the face of the back tunnel of a multi-arch tunnel, which belongs to the technical field of tunnel construction. Background technique [0002] With the accelerated pace of infrastructure construction, the scale of expressway construction has continued to grow in recent years, and more expressway routes have been selected more smoothly, requiring a large number of bridges and tunnels to cross deep valleys and mountains. [0003] Multi-arch tunnels have great advantages, but multi-arch tunnels have large spans, complex structures, numerous construction procedures, and complex construction techniques, which have high requirements for tunnel structure design and construction scheme design. [0004] At present, multi-arch tunnels are mostly constructed using the advanced construction method of three pilot tunnels or middle pilot tunnels, but whether it is the three pilot tunnel metho...

AI Technical Summary

Problems solved by technology

[0003] Multi-arch tunnels have great advantages, but multi-arch tunnels have large spans, complex structures, numerous construction procedures, and complex construction techniques, which have high requirements for tunnel structure design and construction plan design.

[0004] At present, multi-arch tunnels are mostly constructed using the advanced construction method of three pilot tunnels or middle pilot tunnels. Most of them lead to problems such as large amount of demolition, poor waterproof effect of multi-arch tunnels, and long construction period.

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