高速上跨机场高速匝道桥爆破拆除

分析了G4高速上跨高速公路匝道桥爆破拆除工程中上跨高速匝道桥的拆除方法和爆破拆除可能产生的危害。介绍了桥墩及墩上实梁等部位的爆破参数,采取孔内外延时起爆网路,设计不同的起爆顺序,成功实现桥墩、墩上实梁的依次起爆和逐跨倒塌,同时做好上部结构塌落降振、爆破烟尘和飞石控制安全防护措施,提出缩短高速路面防护时间、加快破碎清理的可行方法,保证了周围高速公路和桥下高速路面及管线的安全,可为类似工程提供参考。

Blasting demolition of ramp bridge across airport expressway

Taking the G4 airport expressway on ramp bridge demolition project as an example, the demolition method of ramp bridge across airport expressway and the possible harm caused by blasting demolition were analyzed. The blasting parameters of the piers and the pier on the piers were introduced. The detonation network was designed with different initiation sequences. The sequence of initiation and the collapse of the piers on the piers achieved a success. At the same time, the feasible methods of shortening the protection time of expressway pavement and accelerating the disintegration and cleaning were put forward, which could ensure the safety of expressway pavement and pipeline under the surrounding highway and bridge. It could provide a reference for similar projects.