复杂环境下钢筋混凝土连续梁桥爆破拆除  

Blasting Demolition of Reinforced Concrete Continuous Beam Bridge in Complex Environment

作　　者：刘国军 梁锐 杨元兵 藤潇 李春江 杨帅 LIU Guo-jun;LIANG Rui;YANG Yuan-bing;TENG Xiao;LI Chun-jiang;YANG Shuai(Gansu Lanjin Civil Explosion Higt-tech Co LTD,Lanzhou 730020,China;Gansu Chemical Industry Research Institute Co Ltd,Lanzhou 730020,China;Civilian Blasting Engineering Technology Research Center in Gansu Province,Lanzhou 730020,China)

机构地区：[1]甘肃省化工研究院有限责任公司,兰州730020 [2]甘肃兰金民用爆炸高新技术有限责任公司,兰州730020 [3]甘肃省民用爆炸工程技术研究中心,兰州730020

出　　处：《爆破》2020年第3期99-102,140,共5页Blasting

基　　金：甘肃省省委组织部人才项目〔2019〕;精细爆破技术创新人才培育项目(甘财行〔2019〕35号)。

摘　　要：新桥要求在旧桥爆破拆除后的原址提升重建,需重点保护桥梁原有地系梁及以下桩基不受爆破损伤。钢筋混凝土连续梁桥长430 m,整体性好,混凝土标号较高,决定采用由南向北大毫秒延时逐跨坍塌的爆破拆除总体方案。台帽和联系梁采用垂直孔,桥墩采用垂直孔和水平孔相结合的布孔方式,结合跨间大延时起爆技术,并在地系梁以上预留部分桥墩,修筑缓冲挡土墙,爆破部位有效围挡等安全技术措施,成功将桥梁爆破拆除。爆破振动、爆破飞石等有害效应均在控制范围之内,爆后经检测桥梁保留桩基部分未受影响,同时确保了周边建构筑物及设施的安全。A new bridge was required to be constructed and located on an old bridge site after blasting,which made the original collar beam and pile foundation need to be protected.Since the continuous beam bridge is 430 m long with a good integrity and high concrete grade,an overall blasting demolition plan with a big millisecond time delay and span-by-span blasting demolition blasting method from south to north was adopted.Firstly,some vertical holes were drilled in abutment risers and collar beams,and a combination of vertical holes and horizontal holes were drilled in the bridge piers.And then a long time delay initiation technology between spans was adopted.Besides,and the piers above the ground collar beams were protected,and the buffer retaining walls were constructed.Finally,the bridge was successfully demolished by blasting.The blasting vibration effect and flying stone distance were all within control.After blasting,the remaining pile foundation of the bridge was not affected,and the surrounding structures and facilities were safety.

关 键 词：钢筋混凝土桥 爆破拆除 连续梁 复杂环境 

分 类 号：TU746.5[建筑科学—建筑技术科学]