20 0 2年 5月 1日上午 ,三峡二期上游围堰实现了具有重要意义的爆破拆除。这次爆破的主要目标是拆除围堰的塑性混凝土防渗墙。除了要把混凝土防渗墙炸掉外 ,还要在不溃堰的前提下 ,把墙内的钢管和钢筋支撑架也炸到每段小于 2ｍ ,爆破块体最大粒径不大于 1ｍ ,以方便后期进行陆 On the morning of May 1, 2002, an important blasting demolition was realized at the upstream cofferdam of the second phase of the Three Gorges Project. The main goal of this blasting is to remove the plastic concrete cutoff wall of the cofferdam. In addition to blasting the concrete cutoff wall, but also under the premise of not weir, the wall of the steel pipe and steel support frame also blown each section is less than 2m, the maximum size of the block is not more than 1m, in order to facilitate Late land