Underground interchange bifurcate tunnel underground excavation structure
A technology for tunnels and interchanges, applied in tunnels, mining equipment, earth-moving drilling, etc., can solve the problems of inability to realize and increase the difficulty of underground interchange construction, and achieve the effect of reducing the risk of construction
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Embodiment 1
[0030] like figure 1 As shown, when the number of roadways of the branch tunnel of the underground interchange is less or when the geological conditions are better, the underground excavation structure of the branch tunnel of the underground interchange of the present invention includes at least one grade of gradual change section whose cross-section width gradually becomes larger, and the last The largest section section 5 of the large-span tunnel connected by the first-level gradual change section, the small clear distance tunnel section 7 and the separated tunnel section 8; the middle of the small clear distance tunnel section 7 and the separated tunnel section 8 is provided The reserved middle rock pillar 10 of the bifurcation; one end of the small clear distance tunnel section 7 after the bifurcation is connected with the largest section section 5 of the long-span tunnel; the separated tunnel section 8 after the bifurcation is correspondingly connected to the small clear d...
Embodiment 2
[0037] like Figure 4 As shown, the difference between the present embodiment and the first embodiment is that the tunnel excavation structure of the branch tunnel of the underground interchange is also provided with a multi-arch tunnel section 6, and a central section for branching the tunnel is provided in the middle of the multi-arch tunnel section. A partition wall; one end of the bifurcated small clearance tunnel section is connected to the multi-arch tunnel section; one end of the bifurcated multi-arch tunnel section is connected to the largest section section of the long-span tunnel. Specifically, the multi-arch tunnel section 6 is set between the largest section section 5 of the long-span tunnel and the small-clear distance tunnel section 7, and the middle of the multi-arch tunnel section 6 is also provided with the reserved middle The middle wall structure 9 connected by rock pillars 10, the thickness of the middle wall structure 9 is set in a gradually increasing gra...
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