复杂环境下高速公路天桥爆破拆除

BLASTING DEMOLITION OF THE HIGHWAY OVERBRIDGE IN COMPLEX SURROUNDINGS

针对复杂环境下连霍高速公路新安段游坟嘴跨线天桥爆破拆除工程,通过采用孔内延时、孔外数码电子雷管接力传爆网路,采取控制最大一次齐爆药量、加大爆破破碎度、减小爆破塌落最大块质量、增强桥下缓冲垫层等防护措施,有效控制了爆破振动和塌落振动的影响。爆破对周围建筑物及设施未产生影响;桥体垂直有序塌落,破碎均匀、钢筋混凝土脱离充分,为爆后快速清理提供了保证,可为类似工程提供参考。

Aiming at the highway overbridge blasting demolition engineering,the network of delays in holes and detonating by digital electronic detonator outside holes were adoptted.The protecting measures such as controlling the biggest explosive dosage once,increasing blasting broken degree,decreasing the biggest blasting collapse mass weight,and enhancing the cushion layer beneath the bridge were taken.The impact of the blasting vibration and collapsing vibration were controlled effectively.The buildings and facilities around were not influenced.The body of the bridge collapsed fully and uniformly.The reinforced and concrete separated sufficiently.It guaranteed for the quick cleaning up after blasting and provided a reference for similar engineering constructions.