Rapid construction method for excavation of lower portion of ultra-large cross-section metro station through large arch cover method
A technology for subway stations and super-large cross-sections, applied in underground chambers, earthwork drilling, wellbore lining, etc., can solve problems such as difficulty in guaranteeing construction quality, poor force on joists, etc., achieve small mutual influence, small impact on forming structures, and ensure construction quality effect
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[0029] Example 1
[0030] Such as figure 1 , figure 2 As shown,
[0031] Step 1, excavate the large arch cover of the station and construct the second lining of the arch cover;
[0032] Step two, image 3 Excavation of area A1 in the center slot shown;
[0033] Step three, Figure 4 As shown, the A2 area on the left and right sides of the middle section of the excavation section of the hopping slot, the top-down construction will follow the excavation and support;
[0034] Step four, Figure 5 As shown, the second lining of the side wall in area A2 was applied, and area B1 was excavated; the height between the first layer and the second layer was equal.
[0035] From top to bottom, the slope of each layer increases as the depth increases.
[0036] The slope of the first horse mouth jump is 45 degrees.
[0037] When the second layer was excavated, the slope of the second horse mouth jump was 60°.
[0038] Step five, Image 6 As shown, the B2 area on the left and right sides of the middle an...
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