Synchronized Blasting Demolition of Workshop and Chimney Under Complicated Conditions

Introduction: For technical renovation of the thermal plant, one frame structure workshop of 50,000 m2 construction area and one reinforcement concrete chimney of 150m height shall be demolished by blasting in the same time. The engineering environment is very complicated and the accommodation space for the structures collapse is limited. Therefore, the collapse sequence, direction, scope of the structures must be accurately controlled to ensure the safe operation of the adjacent generator unit and transformer station. Methods: By taking technical measures of theoretical analysis and numerical simulation etc., as well as research on structures collapse process and initiation system, it puts forward the technology of bidirectional folded collapse of the workshop and it uniquely adopts the initiation system that combined with “half-second delay inside drilling” and “millisecond delay outside drilling”. Results and Conclusion: Additionally, by using of the integrated vibration reduction technology in combination of the blasting ruins, buffer ditch and damping ditch, it has safely accomplished the blasting demolition work in high efficiency. Besides the blasting demolition vibration signal is collected and analyzed. The success of the blasting demolition will become valuable reference to other similar works.