| 摘要 |
Railway tunnel of circular section with two lines, constructed with tunnel boring machine, having a separating wall, disposed at the middle of the tunnel, and a slab, placed slightly over the bottom of the tunnel, forming two independent and isolated railway galleries, disposed side by side, one for each line, and a service gallery. The separating wall is resistant to fire and to the piston effect of the trains, and disposes of large openings, provided with fire doors, regularly spaced along the length of the tunnel. The slab disposes of openings, placed close to the circular wall, on both sides and regularly spaced and protected with fire devices of box type. The service gallery is provided with emergency vehicles of shuttle type, which may circulate suspended from the slab.
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