2座105m高双曲线冷却塔控制爆破拆除

Controlled Explosive Demolition of Two 105 m Hyperbolic Cooling Towers

针对复杂环境下2座105 m高冷却塔的结构特点和周围环境情况,采用了机械开设定向窗和减荷槽的预处理方案,之后对圈梁和人字立柱进行爆破。采用了交叉复式网路多段微差爆破,通过延期增加冷却塔倒塌时扭转撕裂时间,来减小冷却塔的塌落块度;采用双层胶皮网和草垫结合的方法有效的控制了飞石;采用开挖减震沟、敷设减震缓冲提有效降低了塌落冲击振动;特别是针对冷却塔爆破粉尘污染严重的现象,在冷却塔基础处灌入1 m高的水,采用单药量分散小药包进行水耦合爆破,有效的降低了粉尘的危害。最后利用高速摄影分析了冷却塔倒地冲击气浪造成周边民宅受损的原因。

Based on the construction features of the two 105 m cooling tower and the surroundings,directional windows and load-reducing grooves were opened by machine firstly,and then the demolition blasting was used to ring beams and zig-zag uprights. Millisecond delay blasting with cross duplex network was applied,which increased the cooling towers＇ reversing and tearing time,finally the falling lumpiness was reduced. Double layer rubber nets and straw mattresses were used to reduce fly rocks. Damping ditches and cushioning dykes were arranged to effectively reduce vibration from falling shock. Water coupling blasting with scattered small charges and 1m high water at the bottom of the cooling towers was designed for the dust pollution in the cooling towers＇ blasting,which greatly reduced the dust damage. High-speed photography was applied to analyze the reason for the huge air billows in the towers collapse.