前言在国内地下管道铺设中,从主干线转移到支线,隧道断面越来越小,使用原来的掘进机械已远远不能满足需要,就不得不采用盾构掘进法,或在硬岩地带用爆破掘进法等。这些方法在进行掘进断面最后施工时,需要很多混凝土,采用盾构掘进法时,需要扇形体(连续地支撑挖掘后的隧道顶板,侧壁等的圆形体)作 Preface In the domestic underground pipeline laying, the transfer from the main line to the branch line, the tunnel section is getting smaller and smaller, the use of the original tunneling machinery has been far unable to meet the need, they have to use shield tunneling method, or in the hard rock zone blasting Driving law and so on. These methods require a lot of concrete for the final construction of the tunneling section. When using the shield tunneling method, a sector body (a circular body supporting the excavated tunnel roof, sidewall and the like continuously) is required