根据静力学和动力学理论,分析了废弃烟囱爆破拆除过程中烟囱倾倒时支承体的作用机理,并结合工程实例,论述了支承体的有效长度及其对爆破效果和烟囱倾倒情况的影响,阐述了防止其倒向失控和保证施工安全的几项可行措施。
【关键词】：拆除烟囱拆除;定向爆破;支承体;定向倾倒;下沉;后坐
【分类号】：TU746
【DOI】：cnki:ISSN:1671-8755.0.2004-01-015
【正文快照】：
烟囱的特点是重心高,支撑面积小,其拆除爆破方法基本相同,常采用定向爆破拆除。常见的烟囱主要有砖质烟囱和钢筋混凝土烟囱。砖质烟囱强度较低,壁厚较大,倾倒着地时容易解体。按烟囱壁的层数可分为单层壁烟囱、双层壁烟囱和三层壁烟囱,其中内层称为内衬,常用薄壁(24 Cm或12 cm)耐火材料砌成,层间间隔5一10 cm左右。钢筋混凝土烟囱强度高,壁厚较小,在倒塌过程中一般不出现断裂,系整体倒塌。倾倒着地时下段筒体速度较小,撞击力较弱,不容易解体,设计时应考虑支承钢筋的反力矩及保留部分牵拉的反力矩对倾倒方向的影响。烟囱拆除爆破方案有定向…
In this paper,based on the theory of dynamic and stable mechanics,principle of action for bear- ing body of falling chimney in the process of blasting and demolition is analyzed, combining some engineer ing examples, the effective length of bearing body of blasted chimney and itS influence to chimney falling di- rection are expounded. and some measures to avoid falling in wrong direction and assure construction safety are given.
【Keyword】：chimney;directional blasting;bearing body;directional falling;subsiding;recoiling
