Excavating method for jump-digging of double-side wall guide pit combined arch part of tunnel
A technology of double-sided guide pits and tunnels, which is used in tunnels, tunnel linings, and earth-moving drilling and mining, etc. It can reduce the disturbance and deformation of the surrounding rock, facilitate the stability of the surrounding rock, and improve the excavation efficiency.
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 The design features and other related features of the present invention will be further described in detail below in conjunction with the accompanying drawings through the embodiments, so as to facilitate the understanding of those skilled in the art:
 attached Figure 1-12 The marks 1-20 represent the left upper pilot pit 1, the right upper pilot pit 2, the left middle pilot pit 3, the right middle pilot pit 4, the left lower pilot pit 5, the right lower pilot pit 6, Arch center pilot pit 7, arch side pilot pit 8, upper core soil 9, lower core soil 10, side pilot pit initial support 11, measuring pilot pit temporary support 12, horizontal joint 13, middle pilot pit column 14, Arch primary support 15, inverted arch initial support 16, side wall secondary lining 17, inverted arch secondary lining 18, mid-pit cross brace 19, arch secondary lining 20.
 Such as Figure 1-10 As shown, the long-span tunnel in this embodiment refers to a tunnel with a height-...
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