隧道爆破技术在开挖污水传输设施竖井中的应用

Application of Tunnel Blasting Technology in Excavating Shaft of Sewage Transmission Facilities

采用隧道爆破技术爆破开挖大东湖核心区污水传输系统4#竖井,通过选取合理的孔内、孔外延时参数和起爆顺序实现单孔单响,严格控制单耗、单孔装药量、一次起爆药量,保证足够的堵塞长度和堵塞质量,结合针对性的技术措施有效控制了爆破振动对现浇圈梁和围护桩的有害效应。

Blasting excavation No.4 shaft of sewage transmission system in the core area of Dadong lake by using tunnel blasting technique.Hole-by-Hole blasting is realized by selecting reasonable time delay parameters and initiation sequence inside and outside the hole.Strictly control single consumption,single hole charge and primary explosive charge,ensure adequate plugging length and quality.Combining with specific technical measures the harmful effect of blasting vibration on cast-in-place ring beam and retaining pile is effectively controlled.