高耸冷却塔原地塌落爆破工艺分析Analysis on Blasting Technology of In-situ Collapse of High-rise Cooling Tower
李介明
摘要(Abstract):
为了研究冷却塔原地倒塌爆破工艺,采用有限元软件进行切口模拟分析,用高清摄像头对筒体及人字形立柱变形进行数据采集,针对筒体变形时间、塌落速度、切口闭合变化、筒体扭曲变形后塌落范围情况进行了详细的分析。实践结果表明:冷却塔原地塌落切口设计并不能按常规4等分平均分配,四个区域对等分配易造成整体下座不倒,第四个区域周长(最后引爆)略大第一区域四分之一,四个区域孔内延期时间分别为MS4/MS8/MS8/HS3孔外为MS2;通过有限元软件模拟筒体产生塌落趋势需要1 s,筒体的开槽口产生闭合需要3 s,筒体空中挤压扭曲触地需要6.8 s,各区域孔内延期时必须在合理时间内完成变形工作,经爆后影像分析测算与模拟时间相同,原地塌落筒体90%在池内,上部圈梁外抛出水池约6 m,对周边制氢站、循环水泵房、钢闸门等设施未造成影响;未对23 m外天然气埋管造成影响,经测量天然气管网塌落振动值仅2.095 cm/s说明原地塌落爆破技术对于触地减震起到较大作用,能有效控制筒体塌落外抛距离。
关键词(KeyWords): 冷却塔爆破;原地塌落;360°切口;变形分析
基金项目(Foundation):
作者(Author): 李介明
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