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脈錫矿体一般极不規則,为了探清其产狀范圍,或为延續地面鑽孔繼續下鑽,必須在坑內进行鑽孔定位測量工作。地表和坑內的鑽孔都分佈在統一的具有一定方位和間距的勘探網線上。这些勘探線有的位于坑道近傍,且其方向大致和坑道方向平行。要測定这些網線上的鑽孔,使其适位于預定的位置上(按設計图放样)。必须开拓短小的支岔巷道和鑽窩,然后才能准确地測定鑽孔位置安放鑽机,进行鑽进。但为节省开拓工程,所开支岔巷道中線應适为鑽孔至其近傍坑道中線之垂線,因此必須事前作些解析計算工作,將解算結果,标註在坑道图上,再往现場整置仪器指导开掘,測定孔位。
Tin vein ore body is generally very irregular, in order to explore the scope of its production, or to continue drilling the ground to continue drilling, borehole positioning measurements must be carried out. The boreholes in the earth’s surface and in the pit are all distributed in a unified exploration network with a certain orientation and spacing. Some of these exploration lines are located near the tunnel, and their directions are generally parallel to the direction of the tunnel. To determine the hole in these cable, so that it is suitable for the intended location (according to the design drawings). We must open up short branches and roadway and drilling nest, and then can accurately determine the location of drill hole drilling rig. However, in order to save the development work, the middle lane of the bifurcated laneway should be suitable for drilling perpendicular to the midline of the tunnel near it. Therefore, some analytical calculations must be made in advance so that the solution results can be marked on the ditches and then Site 整整 instrumentation guide digging, determination of holes.