不同预处理方法对钢筋混凝土水塔爆破拆除效果的影响  

Effect of Different Pretreatment Methods on Blasting Demolition of Reinforced Concrete Water-tower

作　　者：夏曼曼 郑德明 戴春阳 潘宝玉 XIA Man-man;ZHENG De-ming;DAI Chun-yang;PAN Bao-yu(An Hui Tianming Blasting Engineering Co.,Ltd.,Chuzhou 239000,China)

机构地区：[1]安徽天明爆破工程有限公司,滁州239000

出　　处：《爆破》2021年第2期136-140,共5页Blasting

摘　　要：为比较不同预处理方法对钢筋混凝土水塔爆破拆除效果的影响,对两座结构相似的水塔(1#水塔、2#水塔)进行定向爆破拆除。1#水塔爆破切口角度为198°、余留支撑体截面面积为0.68 m^(2)、爆破切口高度为1.5 m、定向窗夹角为45°、采用爆破法开凿对称门;2#水塔爆破切口角度为200°、余留支撑体截面面积为0.70 m^(2)、爆破切口高度为1.2 m、定向窗夹角为63.5°、采用机械法开凿对称门。两座水塔起爆后,1#水塔按预定方向顺利倒塌,2#水塔切口内混凝土全部剥离飞出,配筋外露,水塔未能倒塌。分析认为:爆破切口形成后,余留支撑体截面面积大,单位面积上所承受的压应力小,不利于钢筋混凝土水塔的顺利倒塌;定向窗夹角大小对钢筋混凝土水塔能否倒塌没有直接关系;爆破切口高度是影响钢筋混凝土水塔倒塌的关键因素,爆破施工时要考虑水塔中配筋的强度、刚度和稳定承载能力,选取合理的爆破切口高度。In order to compare the effect of different pretreatment methods on the blasting demolition effect of reinforced concrete water towers,two water towers with similar structures(1#water tower and 2#water tower)were demolished by directional blasting.The blasting cut angle of 1#water tower is 198°,the cross-sectional area of the remaining support body is 0.68 m 2,the blasting cut height is 1.5 m,the angle of the directional window is 45°,and the symmetrical door is excavated by blasting method.The blasting cut angle of 2#water tower is 200°,the cross-section area of the remaining support body is 0.70 m^(2),the blasting cut height is 1.2 m,the angle of the directional window is 63.5°,and the symmetrical door is excavated by mechanical method.After the initiation of the two water towers,1#water tower collapsed smoothly in the predetermined direction,however,as to 2#water tower,the concrete in the cut was completely stripped and flew out,the reinforcement was exposed,and the water tower failed to collapse.The analysis shows that the remaining support body has a large cross-section area and a small compressive stress per unit area after the blasting cut is formed,which is not conducive to the smooth collapse of the reinforced concrete water tower.The angle of the directional window has no direct relationship with the collapse of the reinforced concrete water tower.The height of blasting cut is the key factor affecting the collapse of reinforced concrete water tower.In blasting construction,the strength,stiffness and stable bearing capacity of reinforcement in water tower should be considered,and the reasonable blasting cut height should be considered.

关 键 词：爆破拆除 预处理 钢筋混凝土水塔 余留支撑体截面面积 切口高度 定向窗 

分 类 号：TU746.5[建筑科学—建筑技术科学]