Cable-curve-suspended concrete marine tunnel - with suspended weights loading tube to produce heaviness approaching buoyancy thrust

摘要

The undersea tunnel comprises a tube of concrete, hung in a cable curve between the shores to be linked as in 2009399 the object here being to attain a condition where changes in traffic loading inside the tunnel produce no noticeable sagging in the tube. The weight is increased by weights hung along its length, at set intervals, reaching down to an area close above the sea bottom, the total weight of tube and suspended weights being only slightly greater than the buoyancy upthrust. Weights are pref. hung at 100 m. intervals, and are mounted on lateral projections on the tube. Where the tube is made up from sections, weights may hang in the vicinity of the joints, and they may reach to about 0.5 m above the bottom.