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曲线巷道施工中,一般采用等弦支距法控制曲线巷道的方向,这种方法是在曲线巷道的中心弧线上(或轨道中心弧线上)截取若干相等的短弦组成多边形导线,用大比例尺图绘出弦上各点至巷道两帮的距离(参阅图1),以指导施工。
In the construction of curve roadways, the method of chord-length control is generally used to control the direction of curved roadway. This method is to cut several equal short-chords to form polygonal wires on the central arc of the curve roadway (or on the central arc of the track). The scale diagram shows the distance from each point on the string to the two lanes of the roadway (see Figure 1) to guide the construction.