Positioning device and method for tunnel oblique hole cutting and blasting hole

Abstract

The invention discloses a positioning device for cutting a blast hole with a slanted hole in a tunnel, which comprises a blast hole positioning mechanism fitted on the tunnel face, the blast hole positioning mechanism is connected with a blast hole located outside the tunnel face through a connecting mechanism Angle adjustment mechanism; the blasthole positioning mechanism is provided with a blasthole positioning ring, and the center of the blasthole positioning ring coincides with the blasthole identification point; the blasthole angle adjustment mechanism is provided with an angle adjustment ring, and the circle center of the angle adjustment ring coincides with the blasthole positioning The center of circle of the ring is located on the same horizontal plane; the angle adjustment ring is used to move relative to the blasthole positioning ring on the same horizontal plane to adjust the inclination angle of the drill pipe passing through the blasthole positioning ring and the angle adjustment ring; through the device of the present invention and The method can ensure that the inclination angle of the cutting hole meets the design requirements, so that the bottom of multiple cutting holes can be on a vertical plane to obtain a predetermined cutting effect. At the same time, the device can be used repeatedly and is suitable for various cutting The case of slot eye angles.

Description

【Technical field】 [0001] The invention belongs to the technical field of tunnel blast hole cutting, and in particular relates to a positioning device and method for tunnel blast hole cutting and blast hole. 【Background technique】 [0002] In the process of tunnel construction, the cutting hole is used to blast out a new free surface and provide a free surface for the entire tunnel blasting. The quality of the cutting effect plays a decisive role in the cycle progress. Slant eye cutting is a commonly used cutting method for tunnel blasting excavation, which requires a small number of blast holes and is easy to throw out broken rocks. [0003] The method of squint cutting is generally manual hand-held pneumatic drill for squint cutting. However, in the process of manual squint cutting, it is difficult to control the angle of the squint cutting blast hole. There are two main control methods at present, one is to use the experience of the construction personnel to visually dril...

AI Technical Summary

Problems solved by technology

[0004] The first method requires the construction personnel to have rich experience and rely on experience to evaluate the angle of the blast hole. This method has a large error due to the influence of the construction personnel's supervisory experience

In the second method, the ray of the laser transmitter can provide a reference for the angle of the squint-eye cutout on the horizontal plane, but there is still a certain error in the vertical direction

Both of these two methods lead to a certain error between the angle of the obliquely cut blast hole and the angle of the designed cut blast hole, and then the fundus of the cut blast hole is not on a vertical plane, and the cutting effect is low, which affects the blasting effect of the tunnel. Ended up prolonging the tunnel construction schedule

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