硐室爆破在修建高速公路中的应用

在高速公路建设的双壁高路堑石方开挖地段成功地进行了一次使用微差间隔技术、5 0 8t药量的硐室爆破。文中介绍了爆破设计、爆破震动安全验算及复式起爆网路等有关技术。

The practice of macro disjoint controlled blasting for power plant building complex

After the mechanical dismantling of the equipment in the reconstruction project of a large power plant, there will be many remaining high-rise structures such as load-bearing frames, elevator shafts, coal bunker passages and a single row of wall posts in the steam engine room. In the case of demolition blasting without shutdown of adjacent generating units, directional controlled blasting technology is adopted to determine the collapsing sequence of the buildings to be demolished and carry out macro disjoint demolition blasting on the principle of providing more space. By choosing reasonable parameters and proper collapse direction, the collapse of structures can be ensured smoothly. According to the structure, layout, surroundings, and workload of the structure, the special walls, columns, and structures were pretreatment by mechanical or blasting, so as to reduce the workload of drilling holes and improve the construction efficiency. Long time delay and weak loosening blasting were carried out on the cross-back columns to ensure the collapse direction of the back columns and make full use of the tensile stress between the structures. A flexible cushioning layer was laid in the dumping direction to reduce the degree of touchdown splash; Barrier nets were erected at key protection facilities to block flying objects and good blasting results have been obtained in this macro disjoint demolition blasting.