A shield tunnel passing method in which a large shield tunnel passes first and then constructs an air duct structure
A shield and air duct technology, applied in tunnels, earth-moving drilling, tunnel lining, etc., can solve the problems of slowing down the tunneling speed of the shield, long construction period, affecting the efficiency of the shield construction and achieving the goal of tunneling
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[0017] Please refer to the attached figure 1 To attach image 3 As shown, the present invention is a shield tunnel passing method in which a large shield passes the station first and then builds an air duct structure, which includes the following steps:
[0018] 1), such as figure 1 As shown, the vertical shaft 1 is used as the construction channel, and the horse head gate is opened on the side wall of the shaft, and the soil at the horse head gate is reinforced by grouting, and the three grids at the horse head gate are closely arranged. The small pilot tunnel 2 is excavated by the short step method, and the core soil is left. The step distance of each excavation is not greater than 0.75m. The soil in the arch part is reinforced by grouting with advanced small conduits, and the grouting grout is cement slurry. If the stratum contains water, it should be filled with cement-water glass double-fluid slurry;
[0019] 2), such as figure 2 As shown, the bored cast-in-place pil...
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