Construction Technology of Large Pipe-shed Support in Large-scale Underground Projects

摘要

With the number of large-scale underground engineering projects increasing, the underground construction technology is confronted with new challenges. When excavating and supporting the shallow, soft, loose, watery, fault sections and other poor sections, it is common that the surrounding rock of the excavated surface becomes unstable and the surrounding rock crumbles. In order to control the bad effect of the excavation to the minimum limit and ensure the construction quality safety, the formation needs reinforcing with the advanced support technology, and the pipe-shed support technology is one of the most effective advanced support technologies. Large pipe-shed support technology has gained application and approval home and abroad to some extent. The large pipe-shed support technology, which has gradually applied to the tunnel and underground engineering, still has defects; Firstly, the design, construction and research of ordinary pipe-shed support technology are mostly based on experience and analogy, thus lacking systematic basic theories. Secondly, it has low the construction efficiency, a long construction period and low construction accuracy. Thirdly, the construction cost is higher, which cost labor as well as material. In view of the defects of the ordinary pipe-shed support technology, this paper puts forward and introduce in detail the technology of large pipe-shed support construction steering pipe-following drilling methods, which, with such merits as high construction efficiency and low construction cost, lays a foundation for ensuring the project can be completed within the construction period and provide reference for the similar underground construction projects.