How does a concrete bridge float?
A floating bridge floats on the surface of the water and is held in place by anchors. The flat, floating portion of the bridge is made up of pontoons. The superstructure and roadway are built on top of the pontoons. To float, a structure needs buoyancy. The rule of buoyancy is that anything that weighs less than the water it displaces will float. Pontoons are large, concrete structures that are made up of hollow cells that act like the hull of a ship. Because the pontoon’s immense weight is spread out over a very broad area, it floats.
