测量规程规定，井下觇点分为临时和永久两种。我们埋设永久性测点，同样是用混凝土将铜丝浇注在顶板上。但是我们没有把浇注混凝土的孔填满，而留下10mm左右的空隙，使铜丝挂钩的顶端不露出顶板（如图）这样，以免换支柱或换被板时，把铜钩弄坏，给以后联测或复测带来麻烦。由于埋设这样的永久点，只是需要用点混凝土，铜丝可利用14号废炮线，因此我们就不再分临时 Measurement procedures stipulate that there are two types of temporary and permanent downhole points. We buried a permanent measuring point, the same is the use of concrete casting copper wire on the roof. But we did not fill the hole pouring concrete, leaving about 10mm gap, so that the top of the copper wire hook does not emerge from the roof (Figure), so as not to change the pillars or change board, the copper hook broken to After the joint test or re-test trouble. Due to the placement of such a permanent point, it is only necessary to use point concrete, copper wire can be used No. 14, so we no longer sub-temporary