Device for blasting loose weak surrounding rock and loose weak surrounding rock tunnel construction method

The invention provides a loose weak surrounding rock blasting device which comprises a barrel used for containing explosives and detonators, a front end cover is arranged at the end, inserted into the bottom of a blast hole, of the barrel, and the end, away from the barrel, of the front end cover is conical. And a rear end cover is arranged at the other end of the cylinder body. By means of the device, hole sweeping is not needed after a blast hole is drilled, and even if a part of sand exists in the hole, the explosive can be pushed and loaded to the bottom of the blast hole; meanwhile, the front end cover can be rapidly taken off after blasting, so that the explosion energy of explosives is gathered at the bottom of the hole, the utilization rate of the blast hole reaches 87.5% and is 1.8-2.7 times of the original utilization rate, and the blasting effect is improved. 本发明提出了一种松散类软弱围岩爆破用装置，包括用于装炸药和雷管的筒体，所述筒体插入到炮孔底部的一端设置有前端盖，所述前端盖在远离筒体的端部呈圆锥形；所述筒体的另一端设置有后端盖。使用本发明的装置，在炮孔钻取完成后不用扫眼，即便孔内有部分砂子，也可以将炸药推进装到炮孔底部；同时，爆破