变截面悬链线箱型无铰拱桥切割爆破拆除

DEMOLITION OF A VARIABLE-SECTION CATENARY-BOX AND NON-HINGE ARCH BRIDGE BY CUTTING BLASTING TECHNOLOGY

某中承变截面悬链线箱型无铰拱桥,因部分已出现裂缝和公路建设的需要,必须拆除。通过试验研究,并根据桥以钢结构为主的特点,采用TNT/PENT(40/60)的聚能药包对钢结构实施爆破切割。文中介绍了爆破方案的选择、预处理和切割爆破的设计、起爆网路以及安全技术措施。此外还介绍了自行设计的聚能切割器及其在钢结构上的固定方法。

A variablesection catenarybox and nonhinge arch bridge must be demolished due to partial fissure existence and requisite road constructionThrough some tests and according to its feature of steel structure as main part,the TNT/PENT(40/60)energyconcentrated charges are employed for cutting of steel structureIn this paper,selection of blasting scheme,design of pretreatment and cutting blasting,the priming circuit and safety precautions are introducedIn addition,the selfdesigned energyconcentrated charges and their setting on steel structure are presented