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本法的实质和使用范围。近年来在通道施工中广泛使用排管护棚法,沿构筑物外形敷设一个临时性支护。将直径85～2500毫米,长30～40米以上的钢管、钢筋混凝土管、石棉水泥管顶入土中,或2～5米一节一节地塞入预先钻好的孔道中,接口用焊接或管箍。然后在管内浇筑钢筋混凝土或塞入预制钢筋混凝土。这样就筑成了平面或拱形护棚,有时也沿通道侧壁筑护棚,在护棚的防护下开挖土核,修建承重结构(见图1)。排管护棚不仅可作为临时支护,也可构成永久承重结构的一部分。
The essence and scope of the law. In recent years, extensive use of channel construction in the channel construction shedding law, laying along the structure of a temporary support shape. The diameter of 85 ~ 2500 mm, length 30 ~ 40 meters above the steel pipe, reinforced concrete pipe, asbestos cement pipe top soil, or 2 to 5 meters section into a pre-drilled hole, the interface with the welding or Tube hoop. Then pour the reinforced concrete inside the pipe or stuffed the precast reinforced concrete. In this way, a plank or arched shed is constructed. In some cases, sheds are also built along the side walls of the tunnels to excavate the cores and construct the load-bearing structure under the protection of the sheds (see Figure 1). Not only can it be used as temporary support, it can also form part of a permanent load-bearing structure.