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A simple suspension bridge (also rope bridge, swing bridge (in New Zealand), suspended bridge, hanging bridge and catenary bridge) is a primitive type of bridge in which the deck of the bridge lies on two parallel load-bearing cables that are anchored at either end. They have no towers or piers.
Steel wire rope (right hand lang lay) Wire rope is composed of as few as two solid, metal wires twisted into a helix that forms a composite rope, in a pattern known as laid rope. Larger diameter wire rope consists of multiple strands of such laid rope in a pattern known as cable laid. Manufactured using an industrial machine known as a strander ...
John Augustus Roebling (born Johann August Röbling; June 12, 1806 – July 22, 1869) was a German-born American civil engineer. [1] He designed and built wire rope suspension bridges, in particular the Brooklyn Bridge, which has been designated as a National Historic Landmark and a National Historic Civil Engineering Landmark.
The wire used in suspension bridge construction is a galvanized steel wire that has been coated with corrosion inhibitors. At specific points along the main cable (each being the exact distance horizontally in relation to the next) devices called "cable bands" are installed to carry steel wire ropes called Suspender cables.
Pendants are made of wire rope with a diameter of 1, 1 + 1 ⁄ 4 or 1 + 3 ⁄ 8 inches (25, 32 or 35 mm). Each wire rope is made up of numerous strands twisted about an oiled hemp center core, which provides a "cushion" for each strand and also supplies cable
The Allegheny Aqueduct was John A. Roebling's first wire cable suspension bridge. [1] It was built in 1844 near the later Fort Wayne Railroad Bridge as a replacement for a wooden covered bridge aqueduct over the Allegheny River in Pittsburgh , part of the Pennsylvania Canal .
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This included importing aircraft cable and wire rope from Europe and Japan as well as distributing tools and fittings. In 1962, Loos & Co. began to manufacture cable assemblies. In 1964, facilities were expanded to produce plastic-coated cables. By 1971, the company acquired the necessary equipment and began manufacturing wire rope and cable. [6]