关键词: 混凝土围堰, 爆破拆除, 爆破防护

Abstract: After the rehabilitation of stilling pool, the lateral concrete cofferdam needed to be blasted and removed. To avoid vibration or damage from blasting to the generator units, central control equipment and permanent structures, measures such as layered blasting, presplitting blasting, more blast holes and less charge were adopted. During the blasting, the impact of blasting was reduced by use of shock absorption slot, top cover, water filling of the stilling pools and protective net. The monitoring data showed that the vibration rate had met the requirements and the underwater laser scanning showed that the cofferdam was completely removed. No damage to permanent structures was found during the inspection, indicating the blasting scheme was safe, reasonable and feasible. Moreover, the permanent structures and equipment are operating well after the flood season.

Key words: concrete cofferdam, blasting demolition, blasting protection