Construction method of cross section-expanded loop type depressurizing portal for high-speed railway tunnel
A technology for high-speed railways and tunnels, which is applied in the field of construction of high-speed railway tunnel entrances. It can solve the problems of large increase in the amount of tunnel construction, difficulty in shaft construction, and high construction costs, so as to reduce aerodynamic effects and increase ride comfort. The effect of high reliability and low construction cost
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[0023] Figure 1-4 Show, a kind of embodiment of the present invention is, a kind of construction method of high-speed railway tunnel enlargement cross-section circuit type decompression hole, and its way is:
[0024] A, build 15~20m long expansion section 11 at the opening place of tunnel 10, the sectional area of expansion section 11 is 1.3~1.6 times of tunnel 10 sectional areas;
[0025] B. Build side guide tunnels 12 parallel to the tunnel 10 and 2 to 3 times the length of the enlarged section 11 on both sides of the tunnel 10 entrance. The outer ends of the side guide tunnels 12 communicate with the outside world. The lateral distance is 20-30m, and the cross-sectional area of the side pilot tunnel 12 is 25%-35% of the cross-sectional area of the tunnel 10;
[0026] C. Build horizontal first, second and third cross passages 20, 21, 22 between the pilot tunnels 12 and the tunnel 10 on both sides. The longitudinal position of the first cross passage 20 is located in ...
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