禹门口一级提水泵站岩坎围堰拆除控制爆破设计

Design of removal and controlled blasting for rock cofferdam of Yumenkou Cascade 1 Water-lifting Pumping Station

禹门口一级提水泵站岩坎爆破拆除是难度极大的控制爆破工程 .由于岩坎爆破的周围环境复杂 ,拆除用药量过大及防护不当 ,势必对邻近建筑物产生破坏 .经设计人员研究分析 ,岩坎拆除分两部分进行 ,首先在岩坎内侧 (向建筑物一面 )采用层层剥皮的爆破方式 ,以减少最终预留岩坎一次爆破的难度 ,然后进行预留岩坎的水下拆除 ,确保预留岩坎一次爆破成功 .

The removal and blasting works for the rock beam(cofferdam) of Yumenkou Cascade 1 Water_lifting Pumping Station is a controlled blasting project that has highest degree of difficulty. The beam blasting will cause damages to its adjacent structures due to complexity of its surroundings, excessive explosives and inappropriate protection. After thoroughly studying and analyzing, the designers decide to remove the beam by two steps. First, blasting is performed at the inner side(toward the direction of structures) of rock beam in a way of stripping layer by layer to decrease the difficulty of final removal for the reserved. Then, underwater removal for the reserved beam will be carried out, and the success of “blasting in one time” must be achieved. The first step is described in detail.