摘要
深溪沟导流洞围堰为国内首座预应力结构围堰,采用数值仿真分析等手段,确定了安全可行的预应力释放顺序和工艺,并在预应力释放时对围堰变形进行了有效监控,确保了导流洞进口围堰拆除顺利实施。采用预裂-光爆"双保护层"爆破技术,削弱了主爆孔爆破产生的破坏影响,有效地保护了保留混凝土的质量。根据围堰与永久建筑物距离的远近,将爆区分成不同区域并采取不同的爆破参数,采用高精度毫秒廷时起爆技术,严格控制单段药量,既控制了爆破振动、爆破飞石,又确保了爆破效果,保证了邻近的成昆铁路正常运行。
For a safety demolition of the cofferdam for the river diversion tunnel of the Shenxigou hydropower station,the first prestressed structure cofferdam constructed in China, the feasibility of security order and the release of the prestress were determined based on numerical simulation analysis and some other means. The effective monitoring of the deformation of the cofferdam was taken when the prestress was released, which ensured the demolition of the inlet of the river diversion tunnel to implement smoothly. The employment of presplitting blasting-smooth blasting ＂double-layer protection＂ weakened the impact of blasting of main blasthole,protected the quality of the retaining concrete effectively. According to the distance between the cofferdam and the permanent structures, blasting area was divided into different regions and was operated by taking different blasting parameters, using high-precision millisecond delay detonating technology with strict control of the single-charge. The blasting well controlled the blasting vibration,flying rocks and blasting effects,ensuring the normal operation of the adjacent Chengdu-Kunming Railway.
出处
《工程爆破》
2008年第4期24-28,共5页
Engineering Blasting
关键词
深溪沟水电站
预应力围堰
爆破拆除
Shenxigou Hydropower Station
Prestressed cofferdam
Blasting demolition
