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The rolling lift trunnion (sometimes a "Scherzer" rolling lift), raises the span by rolling on a track resembling a rocking-chair base. The "Scherzer" rolling lift is a refinement patented in 1893 by American engineer William Donald Scherzer. [3] The rarer Rall type combines rolling lift with longitudinal motion on trunnions when opening. [4]
They are both double-rotating (with two separate bridge decks) and single-rotating and with a diagonal bridge deck. In the latter case, there is only one tower which is aside from the road. The pivot point of the balance with the balance box can either next to the gate (as in the photo), or directly above it.
Submersible bridge – also called a ducking bridge, the bridge deck is lowered into the water; Tilt bridge – the bridge deck, which is curved and pivoted at each end, is lifted at an angle; 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
A retractable bridge is a type of moveable bridge in which the deck can be rolled or slid backwards to open a gap while traffic crosses, usually a ship on a waterway. This type is sometimes referred to as a thrust bridge.
Submersible bridge – also called a ducking bridge, the bridge deck is lowered into the water; Tilt bridge – the bridge deck, which is curved and pivoted at each end, is lifted at an angle; 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
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.