The Twin Sails Bridge

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The Twin Sails Bridge is a double leaved bascule bridge that spans the Backwater Channel in Holes Bay connecting the town center of Poole, in Dorset, England, to Hamworthy. In the closed position, the bridge lays flat over its supporting pillars, but when the two spans of the bridge are lifted to allow boats to pass, the two triangular lifting leaves resembles the sails of a yacht. The triangular shape is caused by the fact that the bridge isn’t dissected perpendicularly across its width, but at an angle, creating two long, opposing triangles that lie side by side. When the bridge is opened, they rise skyward, like a pair of masts opening their sails.

The two triangular leaves measure 23 meters each, and when lifted, they provide a clear channel 19 meters wide for boats to pass through. The lift spans are powered by two hydraulic rams which operate up to 15 times per day, and take two minutes to fully open.

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Photo credit: Tanya Hart/Flickr

The bridge was built and opened to traffic in April 2012, after nearly three decades of deliberation, approvals and cancellations. The plan for the construction of a new bridge was initiated in the 1980s. The existing bridge, which was built in 1927, was facing congestion due to increasing traffic levels. At first a fixed bridge crossing Holes Bay and linking with the A31 was suggested but it got cancelled in 1998. The concept of the second lifting bridge was put forward in 2004, and received approval in 2006, but immediately went into hold due to issues between the council and the land owners. When everything was cleared and parties had agreed, construction of the bridge commenced in 2010.

The bridge was designed by architect Wilkinson Eyre and constructed by Hochtief (UK) Construction, at an expense of £18.5 million.

The project received the outstanding achievement award for exterior lighting at the Architecture Lighting Design Awards 2012. It was also among the top four final bridges selected at International Institute of Structural Engineers Awards 2012, as well as being selected under the commendation category for its structural authenticity.

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Fully down the bridge looks quite 'normal'. Photo credit: jeffowenphotos/Flickr

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The Twin Sails Bridge half-opened. Photo credit: jeffowenphotos/Flickr

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The Twin Sails Bridge fully open. Photo credit: jeffowenphotos/Flickr

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Sequence of images showing the Twin Sails Bridge opening. Photo credit: Tanya Hart/Flickr

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Photo credit: twinsailswharf.org

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Photo credit: Dave Morris/Speirs + Major

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Photo credit: Dave Morris/Speirs + Major

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Photo credit: Dave Morris/Speirs + Major

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Photo credit: Dave Morris/Speirs + Major

Sources: Wikipedia / Roadtraffic Technology

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3 comments:

  1. It's a very pretty bridge, when it works, which isn't all the time :-)
    A local.

    ReplyDelete
  2. hi
    please insert pictures url witheout https in blog
    http is better and faster for picture
    thankyou

    ReplyDelete
    Replies
    1. I understand your concern, but Blogger automatically adds HTTPS to all URLs. Using HTTP will mean that I have to edit each URL manually which is too time consuming. In any case, if you have trouble loading pictures over HTTPS, there must be something wrong with your browser or network setting.

      Delete

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