摘要
待拆混凝土连续梁桥两侧相距8 m有在用新桥,倒塌空间受限。对4排桥墩实施爆破并增加爆破切口高度,同一排的3个桥墩,中间切口高5.6 m,两侧切口高3.5 m。对桥墩上方盖梁中部实施松动爆破并使中间桥墩及盖梁中部先于两侧桥墩爆破,实现了桥梁原地坍塌且不向两侧偏移。采用微差爆破并于桥下设置土坎,减小了爆破振动、桥梁塌落振动等危害。
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.
出处
《爆破》
CSCD
北大核心
2011年第4期81-83,共3页
Blasting
关键词
危桥
爆破拆除
控制爆破
unsafe bridge
explosive demolition
controlled blasting
