Disjoint Bidirectional Folding Blasting Demolition of Harbin Longhai Building

摘要

According to the fact that the blasting site is surrounded in three sides by buildings and one side by main street called Zhongshan Road, for the protection of the surrounding residential building, office building, all kinds of facilities and underground pipeline, the prior cutting two parts and bidirectional folding blasting demolition project were taken in pulling down Harbin Longhai Building. Blasting cuts were designed respectively in floors 1 and 2, floors 4 and 5, floors 9 and 10. The collapse direction and ruins height were controlled through the reasonable design of blasting parameters and the key parts pretreatment In addition, the blasting parameters and the detonating network were optimized by test blasting before the demolition. The perfect blasting had achieved through some security measures such as drilling short-ship medicine and delay blasting technique for con-troling blasting vibration damping, pre-forming protection damping ditch for controlling buildings collapsing vibration, taking protective walls for controlling blasting flyrock, building sprinkling for controlling blasting dust and other security measures before the blasting and security checking after blasting.