Structures prestressed by buoyancy

Details Structures prestressed by buoyancy Structures prestressed by buoyancy

E - Fixed Constructions

01

D

E01D 11/00 (2006.01) E01D 15/14 (2006.01)

Patent

CA 2177087

This invention comprises the use of the force of buoyancy to counter the gravity forces due to the dead and live loads imposed on bridge structures spanning bodies of water. This is achieved by securing to the underside of the bottom chord or element of the bridge superstructure, restrained at each end from vertical movement, a buoyancy block or a plurality of buoyancy blocks submerged at all levels of the body of water, thus providing the desired prestress to the superstructure to counter the gravity loads. Further, in a trussed type of superstructure, buoyancy collars may be secured to the vertical elements of the truss, providing additional prestressing forces when the body of water rises and a resistance to the deflection of the bridge structure from the live loads, thus reducing the shearing forces, bending moments, and reactions at the two ends or abutments of the bridge.

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