A new type of military bridge, developed by the U.S. Army, was tested on Monday?
A new type of military bridge, developed by the U.S. Army, was tested on Monday (March 20) by army research personnel at the Sagit River in the state of washington.
Made of aluminium, the bridge is designed to speed river crossings during tactical operations. If the new design passes service tests such as the ones shown in this film shot by the U.S. Department of Defence, the equipment will be issued to U.S. Army engineer units.
SYNOPSIS: United states Army engineers have developed a new method of crossing rivers during combat. Speed is the prime requirement -- and this aluminium bridge is quickly launched from a truck chassis. As the bridge sections enter the water they are unfolded by water buoyancy acting through tension cables and levers. It takes two men just three minutes to release the latches and launch the bridge sections. Each bay of the bridge is twenty-six feet (7.92m) wide when fully opened. This includes a thirteen-and-a-half foot (4m) roadway, and pontoons, which extend just over six feet (1.82m) on each side. To meet military requirements, the bridge must be capable of bearing the weight of 60-ton vehicles in water currents of up to eight feet (2.43m) a second.
In this test, the engineers constructed a span 345-foot (105.15m) long. They say experiments indicate the design is sound.
Some of the Army's heaviest vehicles crossed the bridge during the tests -- travelling only 40 feet (12.2m) apart rather than the normal convoy distance of 100 ft (30.5m). The tests also showed that the bridge could withstand the effects of floating debris, even in fast water.