Contemporary floating bridges are generally made with steel concrete wood or a fusion of these components.

Pontoon bridge made of. Modern pontoon bridges are compact and portable. 3 shows the three forms in which the pontoon bridge may be made up. As a medium bridge to carry medium artillery and lorries in which two pontoons are coupled stern to stern and seven road-bearers are used in each bay.

A pontoon bridge is a bridge that floats on water. According to Roman historian Suetonius the bridge spanned more than 3 miles across the bay. According to Herodotus the bridge was made of 676 ships stationed in two parallel rows with their keels in the direction of the current.

The water acts as a support so the limitation on load carrying is governed by the total and point buoyancy of the pontoons or boats. A major obstacle in the path f the Persian King Xerxes army was the Hellespont a waterway at the head of the Aegean that was nearly a mile wide at its narrowest and separated Asia Minor from Europe. Wooden framed pontoons covered with canvas pontoons made of India rubber and cotton canvas floats followed.

Pontoon bridges made out of concrete have the added advantage of resistance to saltwater corrosion. This bridge consisted of two parallel pontoon bridges each made up of 314 and 360 boats which were tied to the riverbank and T anchored to the riverbed to support the weight of the Persian army with two million men and horses. It is a floating bridge with barges or boats pontoons to support the bridge deck.

LS soldiers walking across it. Xeres bridged the gap with ships not in a ferrying operation but by constructing a unique pair of bridges with hundreds of vessels ranged side by side. They are made out of heavier structures such as concrete and steel as they are built to support heavier vehicular and commuter traffic.

As a heavy bridge to. By Kurt Schlosser on March 30. HIS PROPOSAL WAS FOR A BRIDGE MADE FROM INTERCONNECTED CONCRETE BARGES.