《建井技术》1982年第一期刊登了“狠抓循环争进尺,连续四年上等级”一文,有些同志来信询问该文中提及的《扇形点眼尺杆》的详细情况。这里就将尺杆的计算、制造及使用作一介绍。 一、计算 图1是尺杆的计算图,各计算参数如下式中 C——设计周边眼距; a_1——激光点至拱顶距离; a_2、a_3…——激光点至各周边眼距离; R——半圆拱巷道之拱半径。 二、制造 作厚20毫米、宽40毫米的木板条,按设计长度截取,再在板条两端钻孔,一端用铆钉(或螺栓)固定作转轴,另一端用线绳联起 In 1982, the first phase of “Well-Building Technology” published a paper titled “Paying Attention to Cyclical Competition, Grade for Four Years in a Row”. Some comrades asked in writing about the details of the “fan-shaped rod” in the article. Here will ruler the calculation, manufacture and use as an introduction. First, the calculation Figure 1 is the calculation of the ruler rod, the calculation parameters are as follows C - design peripheral eye distance; a_1 - laser point to the dome distance; a_2, a_3 ... - laser point to the perimeter eye distance; R - semi-circular arch road arch radius. Second, the manufacture of thick 20 mm, 40 mm wide wood strips, according to the design length of the interception, and then drilled at both ends of the slats, one end with rivets (or bolts) fixed for the shaft, the other end of the line together