工程爆破

2018, v.24;No.105(05) 83-90

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50m高镶有水箱的钢筋混凝土烟囱爆破拆除
Blasting demolition of a 50m reinforced concrete chimney inlaid with water tank

陈永麟;张九泽;魏志荣;李启东;李舸;张鹏泉;
CHEN Yong-lin;ZHANG Jiu-ze;WEI Zhi-rong;LI Qi-dong;LI Ge;ZHANG Peng-quan;Gansu Jiulian Blasting Engineering Limited Corp;

摘要(Abstract):

为了安全拆除镶有倒锥形水箱钢筋混凝土复合结构的烟囱,运用有限元软件对该烟囱爆破拆除的倒塌过程进行模拟,得出距触地中心50m处,被保护的框架结构楼房基础位置(4#测点)质点振动峰值1.5cm/s。考虑框架结构楼房在触地振动作用下的响应问题,对该楼房2、4、6、8、12楼层质点峰值振动速度进行了监测和分析。结果表明:各楼层测点触地振动普遍大于爆破振动,振动速度整体随楼层的增高呈衰减趋势,但4、6层测点触地振动的质点峰值振动速度分别为0.622、0.741cm/s,大于基础位置触地振动的质点峰值振动速度0.518cm/s,放大倍数达1.21与1.45。根据数值模拟和监测分析的结果,对镶有倒锥形水箱的烟囱爆破拆除的安全防护,采取了开挖水箱承接坑,沿倒塌中心线方向铺设软垫层,开挖减振沟等方式,取得了较好的效果。振动危害未对框架结构楼房产生影响,整个爆破过程中水箱没有因撞击引起物理爆炸,触地飞石控制在安全范围之内,通过牵引钢丝绳使待拆烟囱倒塌方向无偏离,达到了预期效果,保证了周围建筑物的安全。测点位置的布置可为类似工程提供参考。
In order to safe demolition of chimney with reinforced concrete composite structure inlaid with inverted conical water tank.The finite element software was used to simulate the collapsing process of the chimney.The vibration peak value of the base point of the frame structure at the distance of 50 mfrom the touchdown center reached 1.5 cm/s,considering the response problem under the vibration of the frame structure touchdown,the vibration velocity were monitored of the 2 nd,4 th,6 th,8 th,and 12 th floor of the certain frame structure.The analysis results showed that the touchdown vibration at each measurement point was generally greater than the blasting vibration,and the vibration velocity was integral damping with the floor increase.However,the touchdown vibration peaks at the measuring points of the 4 th and 6 th floors were0.622 cm/s and 0.741 cm/s respectively,which is greater than the touchdown vibration velocity at the base position of 0.518 cm/s,and the magnification ratio reached 1.21 and 1.45.According to the results of numerical simulation and monitoring analyzed.In actual construction,pits were excavated for tanks,cushioned layers were laid in the direction of the collapsed center line,and vibration isolation trencheswere excavated,good results had been achieved.Vibration hazards do not affect the building;there was no impact explosives in the tank during the entire blasting process.The touch-stone was controlled within the safety range;the expected direction was achieved by hauling the wire rope to the direction where the explosivebody collapsed,which achieved the desired results and ensured the safety of the surrounding building structure.The arrangement of the measuring point position can provide reference for similar projects.

关键词(KeyWords): 钢筋混凝土烟囱;数值模拟;控制爆破;触地振动
reinforced concrete chimney;numerical simulation;controlled blasting;touchdown vibration

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作者(Author): 陈永麟;张九泽;魏志荣;李启东;李舸;张鹏泉;
CHEN Yong-lin;ZHANG Jiu-ze;WEI Zhi-rong;LI Qi-dong;LI Ge;ZHANG Peng-quan;Gansu Jiulian Blasting Engineering Limited Corp;

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