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Pipeline bridges may be made of steel, fiber reinforced polymer, reinforced concrete or similar materials. [2] They may vary in size and style depending on the size of the pipeline being run. As there is normally a steady flow in pipelines, they can be designed as suspension bridges. They may also be added to an existing bridge. [1]
To retract the bridge, the hydraulic pistons are activated and the bridge curls up until its two ends join, to form an octagonal shape measuring one half of the waterway's width at that point. The bridge won the British Constructional Steelwork Association's British Structural Steel Design Award. [1]
The center span between the two suspension towers is 1,380 feet (421 m) long, [16] [17] and the side spans between the suspension towers and the anchorages are each 700 feet (213 m) long. [16] The total length of the bridge is 2,780 feet (847 m), and the deck is 98 feet (30 m) wide. [16]
The Mystic River Bascule Bridge is a bascule bridge spanning the Mystic River in Mystic, Connecticut in the United States. It carries vehicle and foot traffic directly into the tourist district of town via 33 ft-wide (10 m) Main Street ( U.S. Route 1 ).
The bridge features two A-Frame masts, which support the bridge from the west bank. The masts are positioned on a shared foundation and anchored at ground level by two 4 + 3 ⁄ 4-inch (120 mm) diameter cables that are connected the tips of the masts. The forward mast is 262 feet (80 m) long and the back mast is 226 feet (69 m) long.
The floor of the bridge consists of a number of 19-foot-wide (5.8 m) transoms that run across the bridge, with 10-foot-long (3.0 m) stringers running between them, and over the top of the transoms, forming a square. [3] Transoms rest on the lower chord of the panels, and clamps hold them together.
The bridge may be stiffened by the addition of cables that do not bear the primary structural or live loads and so may be relatively light. These also add stability in wind. An example is the 220-meter-long (720 ft) bridge across the river Drac at Lac de Monteynard-Avignonet: this bridge has stabilizing cables below and to the side of the deck.
Bottom panel — Used as a brace for bridge girders. it is 6 ft 5 in (1.96 m) long, 2' 3" wide, 3' 7 3 ⁄ 8" high, weight 435 lb (197 kg). End taper panel — Used as a bottom brace between the junction panel and bankseat beam. is 13' 2 5 ⁄ 8" long, 2'4" wide, 1'6" high, and weight 600 lb (270 kg). It is one component that requires at least ...