10-11-2017, 02:16 PM
disadvantages and advantages of submerged flaoting tunnel
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advantages and disadvantages of submerged floating tunnel
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disadvantages and advantages of submerged flaoting tunnel
11-11-2017, 04:57 PM
A submerged floating tunnel (SFT) also called suspended tunnel or Archimedes bridge. It is a tunnel that floats in the water, supported by its buoyancy (specifically, when using the hydrostatic thrust or the Archimedes principle). The tube is placed under water deep enough to avoid water traffic and weather but not so deep as to have to deal with high water pressure, usually 20-50 m (60-150 m) feet) is enough. Cables anchored to the Earth or to pontoons on the surface prevent it from floating to the surface or submerging, respectively.
The concept of submerged floating tunnels is based on the known technology applied to floating bridges and offshore structures, but the construction is mostly similar to submerged tunnels: one way is to build the pipe in sections in a dry dock; then float these to the construction site and submerge them in their place, while they are sealed; and, when the sections are arranged together, the joints break. Another possibility is to build the unsealed sections, and after welding them together, pump the water.
The ballast used is calculated so that the structure has an approximate hydrostatic equilibrium (ie, the tunnel has approximately the same general density as water), while the submerged tube tunnels are weighted more to weigh them to the seabed. This, of course, means that a submerged floating tunnel must be anchored to the ground or water surface to hold it in place (which of these depends on which side of the equilibrium point the tunnel is).
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