高配筋立柱楼房定向爆破拆除技术
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摘要
针对待爆南昌市青山湖宾馆主楼为高配筋楼房,其刚性大、爆破难度大、解体困难等问题,提出了由南向北的定向控制爆破倒塌方案。根据待爆楼房配筋高、刚性大的特点,选择2根典型代表性配筋立柱KJZ26(劲性柱)、KJZ19(双层配筋)进行试爆和预处理,取得合理的爆破参数,以达到楼房顺利倒塌目的:割断立柱局部钢筋,削弱其强度;提高炸药单耗,使钢筋产生塑性变形并抛出混凝土块,最终失去支撑作用。采用的分块斜线起爆网路使楼房爆破后实现空中剪切、弯曲和挤压,改善解体效果,缩短倒塌距离;将楼房分为4跨,分区逐跨落地技术能够有效降低塌落振动。采用后2排双轴支撑链的后支撑链前移技术能够有效防止楼房下坐和后坐。结果表明,爆破效果良好,达到了预期目标。
In response to the problem that the main building of the Qingshan Lake Hotel in Nanchang City to be detonated is a high-reinforced building,the problem of large rigidity,difficulty in blasting,and difficulty of dismantling was put forward.The directional control blasting collapse plan from south to north was proposed.According to the characteristics of high reinforcement and rigidity of the buildings to be blasted,two typical representative reinforcement columns KJZ26(rigid columns)and KJZ19(double reinforcement)were selected for test explosion and pretreatment to obtain reasonable blasting parameters.To achieve the goal of smooth collapse of the building:the partial column steel reinforcement cuts off the column and weakens its strength;raises the explosive consumption,causes the plastic deformation of the steel bar and throws out the concrete block,and finally loses the supporting effect.The block diagonal priming initiation network enables buildings to achieve air shearing,bending and squeezing after blasting,improving the disintegration effect and shortening the collapse distance.By dividing the building into four spans,the partition-by-span landing technology can effectively reduce the collapse vibration.The rear support chain advancement technology using the rear two rows of biaxial support chains caneffectively prevent the buildings from sitting and receding.The results show that the blasting effect is good and the expected goal has been achieved.
In response to the problem that the main building of the Qingshan Lake Hotel in Nanchang City to be detonated is a high-reinforced building,the problem of large rigidity,difficulty in blasting,and difficulty of dismantling was put forward.The directional control blasting collapse plan from south to north was proposed.According to the characteristics of high reinforcement and rigidity of the buildings to be blasted,two typical representative reinforcement columns KJZ26(rigid columns)and KJZ19(double reinforcement)were selected for test explosion and pretreatment to obtain reasonable blasting parameters.To achieve the goal of smooth collapse of the building:the partial column steel reinforcement cuts off the column and weakens its strength;raises the explosive consumption,causes the plastic deformation of the steel bar and throws out the concrete block,and finally loses the supporting effect.The block diagonal priming initiation network enables buildings to achieve air shearing,bending and squeezing after blasting,improving the disintegration effect and shortening the collapse distance.By dividing the building into four spans,the partition-by-span landing technology can effectively reduce the collapse vibration.The rear support chain advancement technology using the rear two rows of biaxial support chains caneffectively prevent the buildings from sitting and receding.The results show that the blasting effect is good and the expected goal has been achieved.
引文
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[11]魏晓林.爆破拆除框架跨间下塌倒塌的切口参数[J].工程爆破,2013,19(5):1-4,13.WEI X L.Cutting parameters of toppling frame building demolished with collapse in beam span by blasting[J].Engineering Blasting,2013,19(5):1-4,13.
[2]陈周熠,易伟建,赵国藩,等.带圆钢管的劲性高强混凝土轴压短柱的承载力及可靠度分析[J].湖南大学学报(自然科学版),2005,32(4):6-11.CHEN Z Y,YI W J,ZHAO G F,et al.Ultimate strength of high strength concrete columns reinforced with concrete filled steel tube under axial compression and their reliability analysis[J].Journal of Hunan U-niversity(Natural Sciences),2005,32(4):6-11.
[3]赵世春,黄雄军,路湛沁.劲性钢筋混凝土柱基本抗震行为的试验研究[J].建筑结构学报,1996,17(3):43-51.ZHAO S C,HUANG X J,LU Z Q.Investigation on aseismic behavior of steel of steel reinforced concrete column[J].Journal of Building Structures,1996,17(3):43-51.
[4]操鹏,吴剑锋,钟冬望,等.基坑支撑梁轴向布孔爆破拆除技术及应用[J].爆破,2017,34(3):96-99,119.CAO P,WU J F,ZHONG D W,et al.Application of explosive demolition technology of foundation pit support beam based on axial hole layout[J].Blasting,2017,34(3):96-99,119.
[5]乐松,赵明生,吴慧,等.茅台三栋高层住宅楼爆破拆除设计与施工[J].爆破,2016,33(3):81-87.YUE S,ZHAO M S,WU H,et al.Design and construction of explosive demolition of three high-rise residential buildings in maotai brewery[J].Blasting,2016,33(3):81-87.
[6]龙源,纪永适.80m高钢筋混凝土烟囱的爆破拆除[J].爆破,1995,12(4):12-16,25.LONG Y,JI Y S.Blasting demolition of a reinforced concrete chimney with a height of 80meters[J].Blasting,1995,12(4):12-16,25.
[7]袁岳琪,周洪文,万里鹏,等.复杂环境下32m高速公路桥墩定向爆破拆除[J].工程爆破,2012,18(1):56-58,19.YUAN Y Q,ZHOU H W,WAN L P,et al.Directional blasting demolition of a 32meters high pier bridge of the supper high way in complex environment[J].Engineering Blasting,2012,18(1):56-58,19.
[8]李勇,徐建勇.大面积厂房的横向逐跨坍塌爆破拆除[J].爆破,2002,19(3):56-57.LI Y,XU J Y.Blasting demolition of a large workshop collapsed transversely span by span[J].Blasting,2002,19(3):56-57.
[9]周治国,陈寿如,袁名清,等.强配筋钢筋混凝土梁的控制爆破[J].矿业研究与开发,1999,19(S3):19-21.ZHOU Z G,CHEN S R,YUAN M Q,et al.Controlled blasting of strongly reinforced concrete Beams[J].Mining Research and Development,1999,19(S3):19-21.
[10]张建平,费鸿禄,曲广建,等.异型截面楼房定向爆破的关键技术和应用[J].爆破,2017,34(1):117-123.ZHANG J P,FEI H L,QU G J,et al.Key technique and application of directional blasting of specialshaped building[J].Blasting,2017,34(1):117-123.
[11]魏晓林.爆破拆除框架跨间下塌倒塌的切口参数[J].工程爆破,2013,19(5):1-4,13.WEI X L.Cutting parameters of toppling frame building demolished with collapse in beam span by blasting[J].Engineering Blasting,2013,19(5):1-4,13.
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