钢筋混凝土杆件轴向预埋孔绿色拆除爆破技术

摘要

为了克服钢筋混凝土杆件拆除爆破钻孔难、成本高、环境影响大的缺点,提出绿色拆除爆破新概念、引入全寿命设计理念并采取在杆件设计施工时就预埋炮孔的技术手段.针对已有垂直轴向预埋炮孔拆除爆破技术耗材多和操作复杂的问题,提出了轴向预埋炮孔拆除爆破专利技术方案;并从预埋管对杆件力学性能的影响角度分析了该方案的可行性.最后以钢筋混凝土基坑支撑梁拆除爆破为例,对比分析了本方案与垂直轴向预埋炮孔拆除爆破方案的动力响应、可靠性、安全性、成本和施工难度,结果表明轴向预埋孔拆除爆破技术方案具备明显优势.%Aimed at solving the problems in reinforced concrete bar demolition blasting projects such as the difficulty of drilling blast holes in reinforced concrete, high cost and serious environmental impact, the concept of green demolition blasting was presented.The means to realize this concept include introducing the full-life design concept into the whole process of design, construct and demolition of reinforced concrete bars and pre-burying pipes as blasting holes when designing and building the bars.Furthermore, to solve the problem of consuming too many explosive materials and too complicated operations in pre-burying vertical-to-axised pipes as blast holes,a new technology featured as using pre-buried axial pipes as blast holes was put forward, and its feasibility was verified in terms of its structural mechanical impact.Finally, taken the demolition blasting of temporary supporting reinforced concrete beams for foundation pit stabilization as example, it was compared that the dynamic response of the beams, reliability, safety, cost and operational difficulty of the two demolittion blasting technologies.The results showed that the new technology was better.