Launch Slideshow

Twin Sails Bridge

Twin Sails Bridge

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    Dave Morris Photography

    The Twin Sails Bridge connects the Borough of Poole to the nearby town of Hamworthy.

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    Dave Morris Photography

    When the bridge is in its closed position it is bathed in white light, with the structural rib of the deck uplit by metal halide sources and LED luminaires integrated into the handrail.

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    Dave Morris Photography

    The lighting on the underside of the deck and wave-form art screen is designed to create a pattern of reflection in the water.

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    Dave Morris Photography

    As the bridge opens, it transforms into a sail-like structure. The middle segment — ­the asphalt roadway and metal-grate pedestrian walkway — ­pivots open and is cut on the bias. As the leaves rise up to full vertical, the two segments stand in opposition and it appears as if two sailboats are passing.

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    Dave Morris Photography

    The pedestrian walkway becomes washed in red as the color of the light changes with the opening of the bridge.

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    Dave Morris Photography

    A mixture of lamp types — ­linear fluorescent, metal halide, and LED­ — were carefully chosen for each luminaire type on the bridge, and lensing and focusing strategies were designed to reduce light spill and glare. The lighting was also designed with ease of maintenance in mind.

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    Speirs +Major

    A rendering of the lighting strategy as envisioned  by Speirs + Major.

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    Speirs + Major

    A cross section through the bridge deck.

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    Speirs + Major

    A cross section of the bridge’s leaves in the open position.

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    Dave Morris Photography

    The deck is still washed in white light as the bridge begins to open.

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    Dave Morris Photography

    Slowly the white light shifts to red light as the bridge moves closer to its full open position.

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    Dave Morris Photography

    The bridge fully open and the switch from white to red light complete.

 

A decade in the making, the Twin Sails Bridge connects the Borough of Poole to the nearby town of Hamworthy. Both communities saw the new crossing as a catalyst for development as well as a necessary addition to alleviate traffic congestion on the nearby Poole Bridge.

The lighting was designed under the direction of Jonathan Speirs, and key to the project brief was the mandate to create a nighttime icon, one that would create an experience for driver, pedestrian, cyclist, and mariner alike. At the heart of that experience is a bridge that transforms into a sail-like structure. The middle segment—the asphalt roadway and metal-grate pedestrian walkway—pivots open and is cut on the bias. As the leaves raise up to full vertical, the two segments stand in opposition and it appears as if two sailboats are passing.

In its closed position, the bridge is illuminated with white light. Metal halide sources uplight the underside of the bridge and its structural ribs. LEDs are integrated into the pedestrian handrail and at the tip of each mast. The lights along the pedestrian zone change from white to red to alert those on the bridge that it’s raising or lowering. Red lights in vertical “totem-like structures” along the bridge begin to flash, and then a wash of red color rolls out like a carpet along the pedestrian path. The animation is perfectly timed thanks to a control system with time clock, photocell, and link to the bridge’s mechanical operating system. With its nod to nautical motifs, the lighting design celebrates the water and the sensation of motion.

Jury Comments: A fantastic project • The split of the roadway on the diagonal is extremely clever. • A great use of color to highlight the bridge structure and mast and to produce striking reflections on the water.