超大断面隧道工程的长管棚套拱支护施工分析

Construction Analysis of Sheath Arch Support for Long Pipe Shed in Super-large Section Tunnel Project

超大断面隧道工程的长管棚套拱支护是隧道施工的关键环节。在成德营盘梁隧道工程长管棚套拱支护施工中,重点分析了长管棚套拱支护施工的要点以及施工效果。实践得出:案例工程在超大断面隧道长管棚套拱支护施工中,结合施工重难点及工区隧道围岩的特性,做好导向墙施工、套拱施工及长管棚制作和安装,最后把控好管棚注浆要点,可高效发挥出长管棚套拱支护施工的优势,确保隧道围岩的稳定,为超大断面隧道工程开挖、衬砌等提供良好的条件。

The sheath arch support of long pipe shed is the key link in the tunnel construction with super-large section.Combined with the actual construction in Yingpanliang Tunnel in Chengde,the key points and construction effect of sheath arch support of long pipe shed are analyzed.The practice concludes that in the construction of sheath arch support for long pipe shed with super-large section,combined with the construction difficulties and the characteristics of surrounding rocks,the advantages of sheath arch support construction for long pipe shed can be effectively played and the stability of tunnel surrounding rocks can be ensured by doing a good job in guiding wall construction,sheath arch construction,manufacture and installation of long pipe shed and finally controlling the grouting points of pipe shed.It provides good conditions for excavation and lining of tunnel engineering with super large section.