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定向窗
为了确保烟囱或水塔能按设计的倒塌方向倒塌,除了正确选取爆破缺口的形式和参数以外,有时在爆破缺口两端用风镐或爆破方法开挖出一个窗口,这个窗口叫做定向窗。定向窗的作用是将保留部分与爆破缺口部分隔开,使缺口爆破时不会影响保留部分,以便确保正确的倒塌方向
expl.
orientating opening
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