Removals of a Top Part of Cast-in-situ Concrete Piles Utilizing Simplicity Charge Holder Blast System

摘要

Removing of a part of case-in-situ pile top and mechanical breakage of concrete structures poses a risk to the occupational safety of those involved in the operation and also to others in the vicinity, due mainly to the noise hazard. A dynamic breakage system utilizing simplicity charge holder and steel plate was suggested rapidly to remove a part of the pile top. The steel plate is used to form the smooth end of the concrete pile and reduce the damage in the remaining part Laboratory-scaled blast tests had been performed to investigate the effect of the angle of the diamond-shaped charge holder on the fracture plane formation. The suggested dynamic breakage system was applied to removing of the top of full scaled concrete piles. The laboratory scaled and full scaled experiments were modeled to analyze the fracture processes of the concrete pile by the charge holders using a dynamic fracture process analysis (DFPA) code. The influence of the notch angle, shot time lag and spacing of the diamond-shaped charge holder on the fracture patterns was investigated.