Directional demolition blasting technology of 9-storey factory building with complex structure
In order to ensure that the ratio of height to width is close to 1∶1,and it is difficult to drill dense steel bars,and the 9-storey workshop with complex structure can be successfully demolished by directional blasting,based on the site construction environment and the structural characteristics of the workshop,combined with the directional blasting demolition principle,in the scheme,the blasting height(blasting height)of the workshop is effectively increased,the working surface of the drilling hole is changed for the column with dense steel bars,the holes are precisely arranged,and the reasonable charge quantity is determined by the test blasting,the millisecond delay initiation technology inside and outside the hole is used to reduce the collapse vibration of the workshop,and realize the directional collapse and complete dismemberment of the structure.The covering protection and safety protection measures are adopted to reduce the blasting flying rock hazard.The results show that the structure is dismembered,the pile is not scattered,and the splash and collapse vibration are not caused.The blasting effect is good,which has certain reference significance for the selection of blasting parameters of similar engineering.
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