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  2. Cantilever - Wikipedia

    en.wikipedia.org/wiki/Cantilever

    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.

  3. Electric gate - Wikipedia

    en.wikipedia.org/wiki/Electric_gate

    The backbone of any electric gate, whether automatic or not, is the electric gate motor, two distinct motor types exist hydraulic, or electromechanical. This is the electric device which actually enables the electric gate to open and close without having to manually push the gate.

  4. Cantilever bridge - Wikipedia

    en.wikipedia.org/wiki/Cantilever_bridge

    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.

  5. Guthrie rolling bridge - Wikipedia

    en.wikipedia.org/wiki/Guthrie_rolling_bridge

    Once the lifting arms are in the fully retracted position the centre wheels are on top of the metal trays and the axles disengage from the cups. The bridge now sits on its inner two axles. From here it is necessary to pull the bridge in until the outer two wheels arrive at the trays. The bridge is then pulled within the gates on all six wheels. [2]

  6. Continuous truss bridge - Wikipedia

    en.wikipedia.org/wiki/Continuous_truss_bridge

    However, continuous truss bridges do not experience the tipping forces that a cantilever bridge must resist because the main span of a continuous truss bridge is supported at both ends. The result of collapse of a continuous truss bridge (the Francis Scott Key Bridge). It is possible to convert a series of simple truss spans into a continuous ...

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