Method for accurately positioning and orienting drill hole of top arch

Abstract

The invention discloses a top arc perforation accurate positioning and guiding method, including the following steps: before digging and blasting an underground chamber, fixing on the blasthole positions and spaces between the blastholes in advance, fixing on the perforation sites, accurately lofting and marking the perforation sites through a metering apparatus; and gradually putting out guide points within the range of 1.5-2m on the dug surfaces of the perforation sites behind the direction of a parallel line of the axis of the chamber, and at the same time arranging reference guide pipes for controlling obliquity and direction in an adjacent bored hole. During the perforation process, a borer can precisely control the boring direction and boring obliquity by taking the guide points, the blast semi-hole of the previous cannon and the guide pipes as the guide reference. The application of the method can ensure the over excavation to be controlled within 10cm. The method reduces influence from man-made factors and improves digging quality. Therefore the method has good market application prospect.

Description

technical field [0001] The invention belongs to the technical field of hydropower construction engineering, and in particular relates to a method for accurately positioning and guiding a top arch drilling hole when an underground cavern is excavated. Background technique [0002] As we all know, in the construction of underground caverns, drilling is the most critical link in the quality control of excavation forming. The quality of drilling is mainly affected by three factors: drilling position, drilling direction, and drilling inclination. In the past, although the traditional construction method also used surveying and setting out to control the drilling points when excavating the contour surface, due to the lack of planning and design in advance, and the control of the drilling direction and drilling angle is basically controlled by the driller based on experience, standardization, The programmatic control means are relatively limited, which makes the excavation quality...

AI Technical Summary

Problems solved by technology

In the past, although the traditional construction method also used surveying and setting out to control the drilling points when excavating the contour surface, due to the lack of planning and design in advance, and the control of the drilling direction and drilling angle is basically controlled by the driller based on experience, standardization, The programmatic control means are relatively limited, which makes the excavation quality unstable and it is difficult to go up the steps

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