Rectangular tunnel full-section blasting excavation construction method

A construction method and technology with a rectangular cross section are applied in the field of tunnel blasting construction to achieve the effect of smoothing the wall surface and improving blasting quality

Inactive Publication Date: 2016-09-21
杨毅
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Problems solved by technology

For the lack of corresponding construction methods and construction experience for rectangular tunnels, how to ensure the stability and safety of the caverns during the excavation of rectangular tunnels is very important, which requires safe and reliable construction methods

Method used

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  • Rectangular tunnel full-section blasting excavation construction method

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Embodiment Construction

[0069] See attached picture:

[0070] The full-face blasting excavation method of a rectangular tunnel includes the following steps:

[0071] 1) Drilling and blasting design is carried out by using the principle of smooth blasting. Cutting holes, auxiliary holes, light blasting holes and encrypted light blasting holes are arranged in sequence from the inside to the outside, and are blasted one by one according to the requirements of smooth blasting, finally forming a standard design rectangular section;

[0072] 2) Cutting hole: The cutting hole should generally be selected at the weak part of the rock to make full use of the structural plane of the rock in the section; if the rock is homogeneous, when using wedge-shaped cutting, it is generally arranged in the center of the section;

[0073] The inclination angle between the cutting hole and the working surface depends on the hardness of the rock and the cutting form adopted, and generally changes between 55° and 75°;

[0074...

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Abstract

The invention discloses a rectangular tunnel full-section blasting excavation construction method. The rectangular tunnel full-section blasting excavation construction method comprises the following steps that drilling and blasting are designed through the smooth blasting principle; cut holes, auxiliary holes, smooth blasting holes and encryption smooth blasting holes are sequentially formed from inside to outside and are blasted one by one according to the smooth blasting requirements; and a standard designed rectangular section is formed finally. The rectangular tunnel full-section blasting excavation construction method is applied to construction, except that a rectangular-section tunnel is constructed according to the smooth blasting requirements, gap narrowing measures are taken for the blast holes in the corners, and thus the smooth blasting effect is improved; and on-site quality inspection shows that the formed section size of the rectangular tunnel meets the design requirement, and the rock surface flatness is smaller than the deviation value required by the specification.

Description

Technical field: [0001] The invention relates to the field of tunnel blasting construction, in particular to a blasting and excavation construction method for a full-section rectangular tunnel. Background technique: [0002] Tunnels are mostly designed in the shape of circular, round arched straight wall, horseshoe, oval, etc., and there are very few rectangular tunnels. For the lack of corresponding construction methods and construction experience for rectangular tunnels, how to ensure the stability and safety of the caverns during the excavation of rectangular tunnels is very important, which requires safe and reliable construction methods. Invention content: [0003] In order to make up for the existing technical problems, the object of the present invention is to provide a blasting and excavation construction method for the full section of a rectangular tunnel, which improves the effect of smooth surface blasting. The on-site quality inspection shows that the size of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D3/04F42D1/08
CPCF42D3/04F42D1/08
Inventor 杨毅
Owner 杨毅
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