Beam Bridge Beam bridges are the simplest form of bridge. They have developed from a log across a river to the large box girder bridges that you see today. In between there have been many different types of beam bridge. A Clam Bridge This is another early form of a beam bridge. it consists of a single slab of stone supported at each end stretching from bank to bank, making a single span. A Clapper …showed first 75 words of 422 total…

…showed last 75 words of 422 total…rope and wood structures in various parts of the world. Modern bridges use a bow sectioned roadway suspended from cables made from extremely strong high tensile steel wires. The main cables, supported by the twin towers, have to be securely anchored to the ground on either side of the bridge. Using suspension bridges have an advantage that they are cheap and give long clear spans, making them the most economical method of bridging large spans.