Double-side-wall composite cross method construction method for large-span tunnel under complex geological condition
A complex geological condition and composite cross technology, applied in tunnels, tunnel linings, underground chambers, etc., can solve problems such as easy deformation of support structures and unsuitable control of vault settlement, and achieve easy construction quality assurance, convenient construction, and structural integrity. Excellent effect
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[0030] The present invention will be further described below in conjunction with the drawings and embodiments.
[0031] Refer to Figure 1 to Figure 7 , The composite cross method construction method of double side walls of a large-span tunnel under complex geological conditions of the present invention includes the following steps:
[0032] (1) Excavate the upper step 1 and the lower step 2 of the left pilot tunnel step by step. Before excavation, apply the corresponding advance support, and immediately apply the corresponding initial support and temporary support after the excavation;
[0033] ⑵Pour the steel frame concrete base Ⅲ of the left pilot tunnel;
[0034] (3) Excavate step by step the upper step 4 of the right pilot tunnel, and the lower step 5 of the right pilot tunnel. Before excavation, apply the corresponding advance support, and immediately apply the corresponding initial support and temporary support after the excavation;
[0035] ⑷Steel frame concrete base of the pil...
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