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一九八六年十一月下旬,长沙工程兵学院地爆教研室应邀前往湖南溆浦县参加该地一渡槽的拆除爆破。该渡槽被爆部分共有四个节间,每节间由二个方型框架和一个A型框架支撑,节间长35米,高20余米。A型框架采用混凝土方框柱,边长0.4米,方型框架采用混凝土圆柱,直径0.3米。由于周围是稻田,渡槽不能向两边倾塌,因此如采用原地坍塌设计,炸一处因柱子太高有可能向两边倾倒,炸两处则高空作业难度较大。为此采用了钻眼式定向偏炸技术。
In late November 1986, the Ground Burst Research Office of Changsha Academy of Engineering was invited to Hunan’s Zhangpu County to participate in the demolition blasting of an aqueduct at the site. The aqueduct exploded in four sections, each section being supported by two square frames and an A-frame. The sections are 35 meters long and more than 20 meters high. The A-frame uses a concrete box column with a side length of 0.4 meters. The square frame uses a concrete column with a diameter of 0.3 meters. Due to the surrounding paddy fields, the aqueduct cannot be collapsed on both sides. Therefore, if the design is collapsed in situ, one of the explosions may be dumped on both sides because the column is too high, and it is more difficult to fry at two places. For this reason, drilling-oriented directional partial frying technology is used.