复杂环境下双曲线冷却塔塔筒开槽拆除方案的设计与数值模拟

Design and Numerical Simulation of the Demolition Scheme of Hyperbolic Cooling Tower Shell with Slot in the Complex Environment

某双曲线冷却塔周边环境复杂,场地狭窄、重要设施较多,若采用传统爆破方式拆除施工难度大、安全风险高、费用昂贵,需采用其它拆除方式。采取在双曲线冷却塔塔筒开槽设水平切口,利用冷却塔自重失稳引发倒塌的方式进行拆除。利用ABAQUS有限元分析,对不同开槽角度下的冷却塔倒塌过程进行非线性数值模拟,分析冷却塔在塔筒开槽情况下倒塌的模式与影响范围。仿真计算结果表明,开槽角度达到90°时,冷却塔可以在自重作用下自行倒塌,计算倒塌时间为9.339 s,工程倒塌影响范围约30 m。冷却塔拆除工程的施工与数值模拟的形状和过程基本一致,由于施工时破拆机械对壳体有明显的扰动,且开槽中心位置正上方设有卸荷槽,实际工程倒塌过程短于模拟时间。冷却塔的开槽倒塌数值模拟和经验可为冷却塔正向设计提供参考。

The surrounding environment of hyperbolic cooling tower in a thermal power plant is complicated,the site is narrow,and there are many important facilities.Because demolition by blasting is difficult,high safety risk and expensive,other demolition methods should be adopted.The cooling tower is dismantled by opening a slot and incision in the tower shell and collapsing due to the instability of the cooling tower’s dead load.ABAQUS,the finite element analysis software,is used to conduct nonlinear numerical simulation of the cooling tower col-lapse process,and to analyze the collapse mode and influence range of the cooling tower collapse when the tower tube is sloted.The calculation results show that when the angle of solt reaches 90°,the cooling tower can col-lapse under its dead load,the time is 9.339 s and the influence range of collapse is about 30 m on the project.The construction of the cooling tower demolition project is basically consistent with the shape and process of nu-merical simulation.Due to the significant disturbance of the dismantling machinery on the shell during construc-tion,and the unloading groove directly above the center position of the solt,the actual collapse process is shorter than the simulation time.The numerical simulation experience of tower demolition with slot can provide refer-ence for forward design of cooling tower.