The 12-tonne bridge only requires two hand winches to power the opening motion manually.
The unique bridge design is inspired by its Victorian forbears. They knew that "moving large, heavy structures efficiently requires that they are part of balanced systems, and this design works on the same principle of equilibrium."Toothed portals at each end of the bridge roll on undulating rails cast into the concrete abutments on either bank. Ballast fills the top of each square portal, countering the weight of the bridge deck that connects them, the release states.
"The idea for an opening bridge with a single moving part – the bridge itself – sounds simple but, as you can probably guess, was actually really hard to do," said Tim Lucas, structural engineer. On either side, the deck is bound by lightweight balustrades woven from reinforcement bars. And when taller vessels need to pass, the elements are folded down flat to the deck before the bridge does its grand rolling movement.
"No one expects a square to roll; I find a childlike joy in this element of surprise," said Randall-Page.
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