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煤矿炮掘工作面,作为临时支护之一的安全点柱也能起到一定的护顶作用,《煤矿安全规程》明确规定:“掘进工作面到永久支护之间,必须使用临时支架或金属前探支架,严禁空顶作业。”目前广泛使用的安全点柱为木支柱(直径不小于150mm),木支柱在实际施工过程中,存在下列缺点;①须随工作面的变化而经常更换,延误支护时间;②工作面底板松软或煤巷施工时容易造成钻底现象,增加移动难度,穿木鞋时影响其稳定性,且木鞋易丢失;③浸水后重量增加,搬动困难,尤其是上、下山掘进时,难度更大;④有时因木质不好而影响支护强度;⑤坑木浪费和损耗较大。鉴于以上原因,我们研制出一种可伸缩的金属点柱,多次试验,效果甚佳,现简介如下:
Coal mine mining face, as one of the temporary support points of the security point can play a role in protecting the roof, “Coal Mine Safety Regulations” clearly states: “Driving face to permanent support between the temporary support must be used or The metal pre-exploration bracket, non-empty top jobs. ”Currently widely used safety points for the wooden pillars (diameter of not less than 150mm), wood pillars in the actual construction process, the following shortcomings; ① must be changed frequently with the face change , Delayed support time; ② soft or coal floor when the construction of the floor is likely to cause boring phenomenon, increasing the difficulty of movement, wearing wooden shoes affect its stability, and wood shoes easy to lose; ③ after flooding, weight, mobility difficulties , Especially on the downhill excavation, more difficult; sometimes because of poor wood and affect the support strength; ⑤ pit waste and waste larger. In view of the above reasons, we developed a retractable metal point and column, repeated tests, the effect is very good, are summarized as follows: