箱形横梁的水压爆破拆除

某电影院大厅内钢筋混凝土箱形横梁长25m,断面尺寸1 6m×2 4m,用水压爆破拆除。通过梁的受力分析得知,为避免横梁的挠度过大,在吊梁拆除后必须另补支撑,以确保水压爆破正常进行。文中对水压爆破炸药用量的计算公式进行了比较和简评。在参考计算结果和考虑厅内环境的基础上,并结合以往水压爆破工程的经验,确定了合理、有效的药量,保证了主体结构的绝对安全。

THEORETICAL CALCULATION OF NOTCHED HEIGHT ABOUT TOWER BUILDING DEMOLISHED BY BLASTING

It is a common knowledge that the notched height of tall reinforced concrete building demolished by blasting is 1.5～2.0 times of the wall thickness of building,which meets the requirements of stand-off and directional collapse.But in the case of a tower building,since there is a supporting steel bar at the blasting cut,the height deducted from the common knowledge is hard to ensure directional collapse.For this reason,the present paper,according to the strength rigidness requirements and stable limit of bearing capacity of compression bar,the notched height of reinforced concrete tower building can be calculated.The produced results agree with the ones used in the discussed blasting engineering,and therefore,are valuable to the similar engineering.