2座90m高的双曲线冷却塔爆破拆除

Blasting demolition of two 90m high hyperbolic cooling tower

介绍了2座高90.0m、底部直径73.6m、顶部直径43.0m的钢筋混凝土冷却塔的定向控制爆破拆除。针对冷却塔高度大、自下而上筒壁由厚变薄,整体性强,冷却循环水淋水装置支柱基础呈分离布置的特点,对设计的减荷槽进行结构校核确保稳定后,采用开凿减荷槽的方法,将倾倒方向上炸高以上的筒壁由连续薄壁结构转变成独立薄壁结构,对淋水装置支柱基础进行预拆除;采用计算机软件模拟人字柱的受力分析,选择合理的开口角度和合适的钻孔布置。对人字柱钻孔装药位置使用炮被和竹跳板进行爆破飞石近体防护,收集淋水平台预拆除时的淋水格栅,并利用其多层多孔的特点,用作爆破防护和隔音吸能,使用多段毫秒延时导爆管雷管起爆网路,逐渐对称地形成爆破切口,确保冷却塔在下坐前和下坐的过程中按预定的倾倒方向倒塌并解体,由此实现了2座冷却塔的定向爆破拆除。

The directional controlled blasting demolition of two reinforced concrete cooling towers with the height is 90.0 m,the bottom diameter is 73.6 m and the top diameter is 43.0 m is introduced.Aiming at the character that the height of the cooling tower is large,the wall from the bottom to the top is thinner,and the integrity is strong.The cooling water circulating device is separated from the pillar foundation.After the structure of the designed relief tank is checked to ensure stability,the method of excavating the deducting groove is adopted to transform the wall of the cylinder above the height of the blasting direction from a continuous thin-walled structure into a separate thin-walled structure,and the water spraying device is pre-demolition.Computer software is used to simulate the force analysis of the herringbone,and a reasonable opening angle and a suitable drilling arrangement are selected.To use the blasting quilt and bamboo springboard on the person column drilling position to the blasting flystone near protection.Collect the shower grille when the watering platform is pre-demolition,and use the multi-layer porous features of the shower grille for blasting protection and sound insulation.Using a multi-segment millisecond time delay detonating detonator initiation network,progressively symmetrically forming blasting notch to ensure that the cooling tower collapses and disintegrates in the predetermined dumping direction during the pre-sit and sit-down processes,thus achieving the two cooling towers directional blasting demolition.