闸墩上部构筑物的控制爆破拆除

采用控制爆破技术拆除包括126m长公路桥、启闭机桥、启闭机房在内的闸墩上部钢筋混凝土构筑物,而所有闸墩得以保护。由于待拆构筑物的结构有很大差异,爆破设计中只给出了爆破参数的设计原则,实际的布孔参数、单孔装药量按各构筑物的具体结构和条件来确定。对于较大深度的炮孔,实施分段装药。为了保护闸底板,爆破前在底板上铺设2m厚的砂袋,并对公路桥实施分次爆破。

DEMOLITION OF THE CONSTRUCTIONS ON TOP OF GATE PIERS BY CONTROLLED BLASTING

The reinforced concrete c onstructions on the top of gate pi ers including a highway bridge wit h a length of 126 meters,the bridg e and buildings of headstock gear were demolished by controlled blastin g while all gate piers were protec ted Because the constructions to b e demolished have a great structur al difference,the principle of bla sting parameter design is given on ly in blasting design while actual parameters for hole pattern and on e hole charge weight are determine d according to concrete structure and conditions of every constructi on Decked charge structure was use d for the blastholes with a greate r depth To protect gate floor,a sa ndbag layer with a thickness of 2 meters were laid on the floor befo re blasting and the highway bridge was blasted piece by piece