Tunnel supporting pipe

Abstract

The invention discloses a tunnel supporting pipe. The technical scheme is characterized in that the tunnel supporting pipe comprises a hollow pipe body, one end of the pipe body is provided with a grouting port, protruding support rods are arranged on the outer wall of the pipe body, each support rod is provided with a first grouting hole communicated with the interior of the pipe body, the support rods are helically arranged along the length direction of the pipe body, and one end, facing a geological stratum, of each support rod is conical. The outer wall of the pipe body is provided with second grouting holes communicated with the interior of the pipe body, the first grouting holes and the second grouting holes are distributed in a double-helix form on the outer wall of the pipe body, and the support rods are slidably inserted into the pipe body. Retaining blocks which are abutted against the outer wall of the pipe body to limit retraction of the support rods are fixed to the support rods, and one end, extending into the pipe body, of each support rod is provided with a slope facing the grouting port. The end, extending into the pipe, of a push rod is provided with a conical face which takes the slopes as fitting faces to push the support rods to extend out. By the support rods protruding the outer wall of a small guide pipe, the small guide pipe can be supported at the center of a geological hole, and a sufficient paste flowing space is reserved between the outer wall of the small guide pipe and the wall of the geological hole.

Description

Technical field

[0001] The invention relates to a support member for tunnel excavation, and more specifically, it relates to a pipe fitting for tunnel support. Background technique

[0002] In the construction of the tunnel advance support project, the use of a small pipe advance support system can play a good role in preventing collapse and improving the stability of the surrounding rock.

[0003] I have retrieved a patent document about small catheters, its announcement number is CN 202165095 U, and its patent name is a tunnel grouting grouting device. The scheme discloses that a grouting port is opened in the small catheter. When the small catheter is inserted After the geological layer, because the outer wall of the small pipe adheres to the soil, there is less space for concrete flow between the two, and the bonding strength between the small pipe and the geological layer is insufficient. Summary of the invention

[0004] The purpose of the present invention is to provide a pi...

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