Explosive Demolition of Unsafe Bridge in Complex Environment

There are two new bridges separately 8 meters away from each side of the concrete continuous girder bridge that would be demolished,the collapsed space is restricted.The four rows of bridge pier were demolished and the height of blast cut is enlarged.For the three piers of the same row,the blast cut height of the middle pier is 5.6 meters and the two laterals′ is 3.5 meters.The loose blasting was implemented in the central of capping beam and making the detonation of the middle pier and the capping beam anterior to the lateral′s,so the bridge was collapsed in-situ without lateral displacement.The blasting vibration and bridge collapsing vibration were reduced by using short-delay blasting and setting ridge under the bridge.