A tunnel central drainage pipe and its laying method

Abstract

The invention discloses a tunnel center drainage pipe. The tunnel center drainage pipe comprises a steel reinforced concrete pipe body, the cross section of the pipe body is in an arch shape, a plane serves as the bottom of the pipe body, the bottom of the pipe body can further extend towards the two sides of the pipe body in the direction perpendicular to the length direction of the pipe body so as to form a first wing plate and a second wing plate, and the pipe body is fixed to the upper portion of an inverted arch structure through fixing parts; and alternatively, the pipe body is directly arranged in a trench below the center of the bottom of the inverted arch structure. The cross section shape of the tunnel center drainage pipe is not round so that construction steps can be simplified, construction of a center drainage pipe seat can be omitted, the next working procedure can be carried out after the center drainage pipe is placed on the plane of the inverted arch structure or the bottom plane of the trench, and the working procedures are simplified. Meanwhile, rotation of the center drainage pipe can be avoided, and thus the center drainage pipe can meet the requirements of stability, straightness and the elevation in the subsequent construction process, blockage of a drainage hole is prevented, and the water permeability of the center drainage pipe is guaranteed.

Description

technical field [0001] The invention relates to the field of drainage pipe fittings, in particular to a tunnel central drainage pipe and a laying method thereof. Background technique [0002] With the continuous strengthening of national infrastructure construction, the number of various tunnel construction projects has gradually increased. Correspondingly, the number, scale and types of tunnel structural diseases are also on the rise. Among them, the main diseases of railway tunnel structure include: lining water leakage, lining cracking and bottom structure damage, which account for about 97% of all diseases. The emergence of such diseases as mud turning and side ditch damage is directly related to the quality of the drainage scheme at the bottom of the structure. [0003] At present, the main solution for tunnel drainage is side ditch plus central drainage pipe for drainage. The location of the central drainage pipe can be located on the upper part of the inverted arch s...

AI Technical Summary

Problems solved by technology

[0005] 1. The process is complicated

During the construction project, due to the lack of understanding of the drainage mechanism of the scheme by the construction personnel, the construction steps of the central drainage pipe seat are often omitted, and the central drainage pipe is directly placed on the inverted arch structure surface or in the central drainage ditch, causing the central drainage pipe to be damaged. Rolling, it is difficult to locate during the subsequent construction process, and it is impossible to maintain the straightness or gradient of the central drainage pipe, which affects the drainage effect;

[0006] 2. It is easy to cause the blockage of the drain hole of the central drain pipe

For the scheme where the central drainage pipe is at the lower part of the inverted arch structure, even if the pipe seat is installed, the circular central drainage pipe is easy to rotate on the pipe seat during the subsequent construction process, such as the drain hole on the pipe rotates to the pipe seat. The contact position will cause the blockage of the drain hole and reduce the water permeability of the central drain pipe

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