目前,矿井掘进巷道采用工字钢棚子支护时,时常会发生掘进工作面放炮崩倒已支护好的工字钢棚子,从而造成空顶面积增大,形成事故隐患,严重时会造成事故。为了防止这类事故的再次发生,我们制作了一种简易推拉器,将这种装置架设在两架金属棚子之间,使金属棚子拉紧推牢,增强金属支架的整体稳定性,从而达到了防止 At present, the mine tunneling roadway using I-beam shed support, often occur digging face blasting has been supporting good I-beam shed, resulting in an increase of empty top area, the formation of accidents, serious accidents will result . In order to prevent the recurrence of such accidents, we have produced a simple push-pull device, which is erected between two metal sheds to tighten the metal shed to enhance the overall stability of the metal scaffold so as to achieve prevent