基础跨台阶的楼房定向爆破技术

两幢六层的框架式楼房建于台阶地形上 ,前后排立柱间的高差为 6m。由于环境条件限制 ,楼房只能朝不利的方向倾倒。通过提高爆破切口的位置 ,首先起爆切口以上的部分 ,最后起爆切口以下部分 ,顺利实现了特殊地形下楼房的定向爆破。文中还介绍了爆破参数和合理起爆顺序的设计、保证楼房倒塌和防飞石的措施、爆破振动速度的验算。

DIRECTIONAL BLASTING TECHNIQUE FOR THE BUILDINGS CONSTRUCTED ON SIDESTEP LANDFORM

Two 6-storeyed frame buildings are constructed on a sidestep landform.A height difference of 6 meters exists between the fore and post pillars.Because of limited environmental conditions,the buildings have to collapse to an unfavorable direction.Through raising the position of blasting cut,blasting firstly the structure above the cut and finally blasting the structure under the cut,the directional blasting to the buildings was smoothly realized in special landform.Besides,the design of blasting parameters and reasonable firing sequence,technological measures for ensuring building collapsing and preventing flying rocks,the check of blasting vibration velocity were presented in this paper.