Positioning device of cuthole angle

Abstract

The invention discloses a positioning device of a cuthole angle for the field of explosion control in tunnel and underground structures by drilling and blasting methods. The positioning device is matched with a rock drilling machine for use; the angle of a compass is determined according to the direction of a tunnel face and the drilling direction beforehand; the compass is mounted through a compass box specially manufactured, is fixed on a drill rod of the rock drilling machine, and is leveled; the rock drilling machine is flatly shifted left and right to enable the angle of compass to match with a preset angle; then, the rock drilling machine is fixed; and the compass box is taken down for drilling. In the drilling process, the compass box can be mounted at any time for checking the drilling direction, so that the drilling angle accuracy is guaranteed, and the utilization rate and the production efficiency of blast holes are improved.

Description

technical field [0001] The invention relates to the field of drilling and blasting construction in tunnels and underground structures that requires controlled blasting, in particular to a positioning device for the angle of a cut hole. Background technique [0002] According to relevant data, the tunnels currently built in my country mainly use the drill and blast method for construction. Because the drill and blast method has strong adaptability to geological conditions and low excavation cost, it is especially suitable for the construction of hard rock tunnels, broken rock tunnels and a large number of short tunnels, so the drill and blast method is currently the main method of tunnel excavation. Blasting excavation is a method of completing tunnel construction based on drilling and blasting processes, coupled with loading and transporting machinery to excrete slag. It is the main process of tunnel construction. Its success or failure directly affects the stability of surr...

AI Technical Summary

Problems solved by technology

[0004] From the perspective of the cutting construction site, there are many problems, such as: 1) The eye position is not accurate, and the vibration of the drill pipe causes the change of the eye-to-mouth distance, resulting in the eye-to-mouth distance not meeting the design requirements

2) The location of the blast hole is wrong, and the cutting direction is determined visually on site, which is quite different from the requirements of the regulations

4) The blast hole is deep or shallow, which does not meet the requirements of the regulations

Lead to the following blasting results: 1) The blasting effect is poor, the cycle footage is low, and the blast hole utilization rate is small (less than 80%)

2) The residual eye is deep, which brings difficulties to the drilling operation of the next cycle

The control of construction accuracy without the help of instruments is limited. The reason for the above results is that there is a lack of a tool that is convenient for on-site cutting, positioning and setting out.

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