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Round small-section tunnel excavation profile control construction method

A construction method and contour control technology, applied in tunnels, earthwork drilling, mining equipment, etc., can solve the problems of small working space, slow excavation speed, and difficulty in controlling the tunnel excavation contour.

Inactive Publication Date: 2019-04-16
CHINA RAILWAY 12TH BUREAU GRP +1
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Problems solved by technology

[0002] With the continuous development of my country's social economy, the development of water conservancy projects is also very rapid. During the construction of the circular small cross-section water diversion tunnel, due to the small working space and the difficulty in the construction of large-scale mechanized supporting equipment, it is difficult to control the excavation of the tunnel Outline, and the excavation speed is slow, which has become the biggest problem in the construction of circular tunnels

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[0044] According to one embodiment of the present invention, the cut blast hole 5 adopts a V-shaped slanted cut to form a larger free surface after blasting, and the free face is formed by the air and air generated by the soil during the blasting process. The contact surface and the air surface play an important role in the blasting, and the blasted soil needs to be moved and destroyed along the air surface to ensure the blasting effect.

[0045] According to one embodiment of the present invention, in the process of drilling, it is required that the drilling depth exceeds the design depth by no more than 20 centimeters, the movement range of the orifice is no more than 2 times the aperture, and the drilling angle deviation is no more than 1 degree, so as to ensure Subsequent explosion effects.

[0046] According to the technical solution of the present invention, step: S3) loading photoblast rolls into the formed blast holes 3, the auxiliary blast holes 4 and the cut blast ho...

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Abstract

The invention provides a round small-section tunnel excavation profile control construction method. The construction method comprises the following steps that S1, the to-be-excavated circle center position on a tunnel face of the tunnel is determined through a laser alignment instrument, according to the to-be-excavated circle center position and the to-be-excavated radius of the tunnel, the to-be-excavated profile line of the tunnel face is determined, wherein the to-be-excavated tunnel face forms a closing range for surrounding the to-be-excavated circle center position; S2, along the to-be-excavated profile line, the position of a blast hole is determined, the position of an auxiliary blast hole and the position of a slotting blast hole are determined within the range formed by the to-be-excavated profile line, and the blast hole, the auxiliary blast hole and the slotting blast hole are formed through drilling construction; S3, the formed blast hole, the auxiliary blast hole and theslotting blast hole are filled with light explosive cartridges respectively, and blasting operation is conducted. The excavation profile of the tunnel can be well controlled, and the construction efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method for controlling the excavation profile of a circular small-section tunnel. Background technique [0002] With the continuous development of my country's social economy, the development of water conservancy projects is also very rapid. During the construction of the circular small cross-section water diversion tunnel, due to the small working space and the difficulty in the construction of large-scale mechanized supporting equipment, it is difficult to control the excavation of the tunnel The outline and the slow excavation speed have become the biggest problems in the construction of circular tunnels. Contents of the invention [0003] The object of the present invention is to provide a construction method for controlling the excavation profile of a circular small-section tunnel, which can better control the excavation profile of the tunnel and ...

Claims

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Application Information

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IPC IPC(8): E21D9/00
CPCE21D9/003E21D9/006
Inventor 程凯赵香萍史振宇王学军李晓王灵敏郝建宏
Owner CHINA RAILWAY 12TH BUREAU GRP
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