A line drawing method for controlling the excavation contour line in the construction of three-center circular arch fork in shaft and roadway engineering

Abstract

The invention discloses a method for controlling the drawing of an excavation outline in three-centered arch and fork construction of sinking and driving engineering. The method comprises the steps of setting an arch top control line and a beveled-edge wall control line, calibrating a springing point, drawing a springing line, calibrating an arch top locating point, drawing a line by using a line rope and the like. According to the method disclosed by the invention, data used by line drawing can be reduced to a large extent, the number of the data can be reduced from the original more than 400 to just about 10, the line drawing can be very simple and quick, the working amount is reduced by tens of times, not only is the labor intensity of a worker reduced, but also the line drawing work efficiency is increased; and the excavation outline, which is drawn by the method, of a three-centered arch roadway is accurate in location, the outline is a continuous smooth curve, the design error is small, the line drawing accuracy is effectively increased, thus the excavation forming quality of an arch part and a fork of the three-centered roadway can be ensured, and the phenomena of over-excavation and under-excavation can be prevented from happening.

Description

Technical field [0001] The invention belongs to the technical field of roadway construction, in particular, a method for drawing a contour line for controlling excavation in the construction of a three-center circular arch bifurcation in a mine roadway project. Background technique [0002] At present, the excavation contour line needs to be drawn in advance before the excavation (boring) of the three-centered bifurcation of the tunnel engineering. During the construction of all roadways, the contour line of the roadway is positioned with the measurement center line and waist line of the roadway as the baseline. The traditional method of drawing the contour line of the bifurcation of the three-centered circular arch is to give a section view or make a data sheet for each meter of the measured center line and waist line to control the arch height and width of the gradual section, plus the plan view and the longitudinal section view. , More than 420 data are required. If the curre...

AI Technical Summary

Problems solved by technology

[0003] 1) Due to too much data, the workload of drawing the outline of the three-center circular arch roadway on the construction site is heavy, time-consuming and laborious, and the labor intensity of the staff is extremely high, and the efficiency is low

[0004] 2) The arch portion of the traditional drawing method can only be located by drawing points. Since the points are connected by line segments, the drawn line is not a continuous line segment. The roadway outline drawn on site has a large error with the design. The quality of the excavation at the fork and fork is poor, and it is easy to cause over- and under-excavation phenomena

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