Abstract: A self-propelled truck has a rotatable turret on which an articulated and nested assembly of frame members and a scaffold is mounted for transport. The turret and assembly can be operated to place the frame members in position to define a vertically extending portion outwardly of one side of the truck to extend, for example, downwardly of the side of a bridge on which the truck is located. The scaffold then extends horizontally from the lower end of the vertical portion and may be swung horizontally to extend either parallel to the side of the bridge or to extend inwardly under the bridge. The scaffold is also vertically movable and wheeled stabilizers on the truck can hold the same against tilting while permitting movement of the truck across the bridge with the assembly extended as described.

Abstract: A compliant bearing of the fixed or movable type for supporting heavy loads in compression, as advantageously used for coupling piers and scaffolds of a bridge or viaduct, has been developed using multiple layers of polychloroprene and fluorocarbon resin. A steel base plate provided with a recessed seat contains in ascending order: a first sheet of a fluorocarbon resin having a low coefficient of sliding friction, a thick layer of pressed polychloroprene having on its upper part a peripheral seat wherein at least one peripheral weather strip is arranged, and a second sheet of fluorocarbon resin also having a low coefficient of sliding friction, and an upper steel plate located upon the second sheet of fluorocarbon resin. Fixed, unidirectional, and multidirectional horizontal displacement configurations are described.