A fast positioning method for grouting holes in tunnel curtains

Abstract

The invention relates to a quick positioning method for a tunnel curtain grouting hole. Before using the positioning device, the effective length of a telescopic rod is adjusted according to the construction sequence of the 'first an outer ring and then an inner ring', and then an extension angle is drilled according to the design of each grouting hole position on the outer ring to adjust the inclination of a positioning steel ring; after the positioning device is adjusted, a hoop is nested on an orifice tube; at this time, the positioning steel ring is aligned with the highest position of thegrouting hole in the outer ring, and a circle is drawn along the inner edge of the steel ring to quickly position for a drill pipe to drill; similarly, the telescopic rod is rotated several times andall grouting holes in the outer ring can be sequentially and quickly drawn according to the same included angle; the mode is repeated and the effective length of the telescopic rod is adjusted so that other grouting hole positions can be quickly positioned, the construction radius can be adjusted by changing the length of the telescopic rod, while a plane angle disc and an extension protractor can change the angle of the positioning steel ring. After the length of the telescopic rod and the angle of the extension protractor are determined, the same ring of grouting holes can be quickly positioned, and the construction efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of advanced curtain grouting in civil engineering tunnels, and mainly relates to a rapid positioning method for tunnel curtain grouting holes. Background technique [0002] In the field of tunnel engineering, when encountering weak, water-rich or other unfavorable formations, advanced curtain grouting technology is widely used to improve the characteristics of the surrounding rock ahead, reduce the permeability coefficient, and reduce the risk of construction excavation. [0003] In the advance grouting technology, first of all, it is necessary to locate each grouting hole and install the orifice pipe according to the design, which mainly includes the determination of the grouting hole position on the tunnel face and the control of the space angle, and the concentric circle is often made with the center point of the tunnel. The holes are arranged in the same way, the initial position is on the slurry wall of...

AI Technical Summary

Problems solved by technology

[0010] In order to overcome the problems of low efficiency and poor accuracy of existing tunnel grouting hole position positioning technology, the present invention provides a rapid positioning method for tunnel curtain grouting hole position. The accuracy of position and flare angle can avoid the poor quality of tunnel grouting. Its rapid positioning device has the characteristics of simple mechanical structure, easy manual operation and high accuracy.

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