双曲线型冷却塔爆破拆除设计与分析

Design and Analysis on Explosive Demolition of Hyperbolic Cooling Tower

双曲线型冷却塔在当前爆破拆除中很常见,其结构对称,整体性强,钢筋较密,相对牢固。拟拆冷却塔的爆破切口高度不小于1.8 m;在缺口范围外沿倒塌中心线至标高+15.0 m处预先爆破1条宽50 cm的切割缝;截断圈梁,破坏其整体性,彻底破坏钢筋网的承重;采取减震措施,倾倒方向安全距离根据高度确定并适当增大;确保爆破后顺利倾倒并在切口闭合后能够继续倒坍。

The hyperbolic cooling tower is common object in current explosive demolition, of which the structure is symmetrical and strong enough. The blast cut height is designed as 3δ, and no less than 1.8 m. A 50 cm wide cut sew was preliminary demolished along collapse centerline at height location 15. 0m, and the circle beam and wire - mesh reinforcement were completely destroyed. Some measures were adopted to reduce blasting seismic. The safety distance in collapse direction should be designed according to the tower height, which insures toppling after incision closing.