连续梁跨江危桥应急抢险爆破拆除  

Emergency Blasting Demolition of Continuous Beam Bridge Across River

作　　者：王威 贾永胜 刘昌邦[1,2,3] 徐华建 陈治波[1,2,3] WANG Wei;JIA Yong-sheng;LIU Chang-bang;XU Hua-jian;CHEN Zhi-bo(Hubei(Wuhan)Explosions and Blasting Technology Institute of Jianghan University,Wuhan 430056,China;Hubei Key Laboratory of Blasting Engineering,Wuhan 430056,China;Wuhan Explosions and Blasting Corporation Limited,Wuhan 430056,China)

机构地区：[1]江汉大学湖北(武汉)爆炸与爆破技术研究院,武汉430056 [2]爆破工程湖北省重点实验室,武汉430056 [3]武汉爆破有限公司,武汉430056

出　　处：《爆破》2020年第3期90-94,共5页Blasting

基　　金：住房和城乡建设部科学技术计划项目(2017-k5-005);武汉市创新人才开发资金资助项目。

摘　　要：结合连续梁跨江危桥应急抢险爆破拆除工程实践,具体介绍了跨江危桥的爆破拆除技术、施工组织设计和安全保障措施。通过对桥墩、T梁以及桥面各分区间设置合理的爆破延期时间,使桥梁各节点处产生倾覆力矩,实现“多米诺”骨牌式连续倒塌。充分利用有限的陆地作业平台,利用爆破技术拆除稳定段桥面结构“推倒”不稳定段桥墩,最大限度地降低作业风险,改善爆破效果。通过监测桥墩偏移位移,搭建跨江作业平台,组织渡江作业船只,顺利地完成了跨江危桥爆破拆除任务。针对不稳定状态的连续梁跨江危桥,采用爆破方法可实现安全、高效的拆除目标,可供类似工程借鉴。Combining with engineering practice of emergency blasting for continuous beam bridge,the unsafe bridge blasting technology,construction organization design and safety assurance measures were introduced.By setting reasonable blasting delay times between the bridge piers,T-beams and bridge deck,the overturning moment was generated at each bridge node to make a continuous domino collapse.The blasting technology used the stable section bridge deck to demolish the unstable pier,which could make full use of the limited land platform,minimize operation risk and improve blasting effect.By monitoring the bridge pier displacement,building the operation platform across the river and organizing the ships to cross the river,the bridge demolition was successfully completed.This blasting method can realize a safety and efficient demolition target to unsafety bridges,which can be used to some similar projects.

关 键 词：连续梁桥 爆破拆除 原地坍塌 应急抢险 

分 类 号：TU746.5[建筑科学—建筑技术科学]