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A sliding electric gate with electric motor and backup battery in case of mains failure. Note also the Infrared obstacle sensor located on the wall to prevent the gate from closing while a vehicle or other obstacle is in the way.
A cantilever in a traditionally timber framed building is called a jetty or forebay. In the southern United States, a historic barn type is the cantilever barn of log construction. Temporary cantilevers are often used in construction. The partially constructed structure creates a cantilever, but the completed structure does not act as a cantilever.
A cantilever bridge is a bridge built using structures that project horizontally into space, supported on only one end (called cantilevers).For small footbridges, the cantilevers may be simple beams; however, large cantilever bridges designed to handle road or rail traffic use trusses built from structural steel, or box girders built from prestressed concrete.
A swing bridge (or swing span bridge) is a movable bridge that can be rotated horizontally around a vertical axis. It has as its primary structural support a vertical locating pin and support ring, usually at or near to its center of gravity, about which the swing span (turning span) can then pivot horizontally as shown in the animated illustration to the right.
A bascule bridge (also referred to as a drawbridge or a lifting bridge) is a moveable bridge with a counterweight that continuously balances a span, or leaf, throughout its upward swing to provide clearance for boat traffic.
Portcullis at Desmond Castle, Adare, County Limerick, Ireland The inner portcullis of the Torre dell'Elefante in Cagliari, Sardinia, Italy A portcullis (from Old French porte coleice ' sliding gate ') is a heavy, vertically closing gate typically found in medieval fortifications. [1]
Swing bridge – the bridge deck rotates around a fixed point, usually at the centre, but may resemble a gate in its operation; road or rail; Transporter bridge – a structure high above carries a suspended, ferry-like structure; Jet bridge – a passenger bridge to an airplane. One end is mobile with height, yaw, and tilt adjustments on the ...
The Golden Gate Bridge is a suspension bridge spanning the Golden Gate, the one-mile-wide (1.6 km) strait connecting San Francisco Bay and the Pacific Ocean in California, United States. The structure links San Francisco —the northern tip of the San Francisco Peninsula —to Marin County , carrying both U.S. Route 101 and California State ...
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