Secondary lining back backfill grouting pipe and grouting method

Abstract

The invention relates to a secondary lining back backfill grouting pipe and a grouting method, and belongs to the technical field of tunnel construction. The grouting pipe comprises a vertical grouting pipe, a longitudinal grouting pipe and branch pipes, wherein the vertical grouting pipe is arranged at the end, to be lined, of a tunnel along an intermediate axis of the tunnel, and a transition pipe section is connected to the top end of the vertical grouting pipe; the longitudinal grouting pipe is arranged on the top end of the vertical grouting pipe along the depth direction of the tunnel, and one end of the longitudinal grouting pipe is connected with the transition pipe; a grouting hole is formed in the vertical grouting pipe located at the end, to be lined, of the tunnel; the branch pipes are connected to two sides of the longitudinal grouting pipe along the radian direction of the tunnel; the longitudinal grouting pipe and the branch pipes are embedded in the secondary lining concrete, and grouting holes are uniformly formed in the longitudinal grouting pipe and the branch pipes; and one end, far away from the end, to be lined, of the tunnel, of the longitudinal grouting pipeextends into the lined end of the tunnel. The grouting pipe and the grouting method ensure that the secondary lining concrete holes are filled with grout, and cavities of the whole secondary lining concrete can be filled only by one-time grouting, thereby saving the construction time.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a backfilling grouting pipe behind a secondary lining and a grouting method. Background technique [0002] Filling and grouting behind the secondary lining is an important process to ensure the quality of the secondary lining. Due to the limitations of concrete, holes are particularly prone to appear behind lining concrete, especially vaults. The concrete is not dense, which greatly affects the overall strength of the lining concrete. Therefore, grouting must be backfilled after tunnel construction to compact the holes behind the lining concrete to ensure the overall strength of the lining concrete and enhance the waterproof function. [0003] Backfill grouting behind the traditional secondary lining is usually to embed multiple pre-embedded grouting holes in the first version of the secondary lining, and grout one by one in the pre-embedded grouting holes after tun...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a backfilling grouting pipe and grouting method behind the secondary lining to solve the problem that the traditional backfilling grouting behind the secondary lining adopts a plurality of pre-embedded grouting holes buried in the second lining of the first version. In the pre-buried grouting holes one by one, the gaps in the second lining concrete cannot be filled well, so that the grouting is of little significance for improving the overall strength and enhancing the waterproof function; many parts without holes are reversed. Injecting grout, resulting in waste of cement grout; grouting one by one grouting hole, the technical problem of low construction efficiency

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