Construction method of soft surrounding rock tunnel collapse cave foam concrete backfill structure

Abstract

The invention relates to a construction method of a soft surrounding rock tunnel collapse cave foam concrete backfill structure. The construction method comprises the following steps of 1) conducting constructing and manufacturing; (2) excavating a manual hole digging pile; 3) binding a reinforcement cage; (4) bearing platform construction; 5) backfilling small karst caves at the bottom of the tunnel; (6) forming small waterless karst caves in the side wall of the tunnel; (7) conducting vault crack construction; (8) backfilling the tunnel vault small waterless karst cave; (9) constructing a pre-embedded steel frame of a supporting wall; (10) conducting supporting wall and lining construction; (11) conducting secondary lining construction; 12) conducting back pressure backfilling; and (13) conducting tunnel roadbed construction. The method has the beneficial effects that a retaining wall of the manual hole digging pile adopts an assembly type, and a water escape valve is arranged on the retaining wall, so that the water escape valve can be opened and closed at any time according to the water quantity around the hole, the safety in the hole digging construction process is ensured, and the construction efficiency can be improved by using the assembly type technology.

Description

technical field [0001] The invention relates to a construction method of a foam concrete backfill structure for collapsed tunnels in weak surrounding rocks, which is mainly suitable for tunnel construction in weak surrounding rocks, including the foam concrete backfilling construction of small anhydrous karst caves around the tunnels. Background technique [0002] At present, my country is in the process of large-scale tunnel construction, and the design and construction problems of tunnels with weak surrounding rocks have been plaguing the majority of tunnel builders. Tunnels with weak surrounding rock usually show large deformation of the surrounding rock, even damage to the structure, and safety accidents such as collapse; the construction progress is slow, which seriously restricts the construction period of the project. The main reasons for these problems are insufficient understanding of the deformation mechanism and development and evolution laws of the tunnel surroun...

AI Technical Summary

Problems solved by technology

Tunnels with weak surrounding rock usually show large deformation of the surrounding rock, even damage the structure, and cause safety accidents such as collapse; the construction progress is slow, which seriously restricts the construction period of the project

The main reasons for these problems are insufficient understanding of the deformation mechanism and development and evolution laws of the tunnel surrounding rock, especially the weak surrounding rock, and the lack of pertinence in the control techniques and methods adopted.

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