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Falkirk Wheel

The Falkirk Wheel is a rotating boat lift in Tamfourhill, Falkirk, in central Scotland, connecting the Forth and Clyde Canal with the Union Canal. It opened in 2002 as part of the Millennium Link project, reconnecting the two canals for the first time since the 1930s.

History
Pre-1933 link map of the lock flight at Falkirk The two canals served by the wheel were previously connected by a series of 11 locks. With a difference in height, it required of water per run and took most of a day to pass through the flight. By the 1930s these locks had fallen into disuse, and were dismantled in 1933. and by the mid-1970s the Union Canal was filled in at both ends, rendered impassable by culverts in two places and run in pipes under a housing estate. The British Waterways Board (BWB) came into existence on 1 January 1963, the day the Forth and Clyde Canal was closed, with the objective of finding a broad strategy for the future of canals in the United Kingdom. Restoration of sea-to-sea navigation was deemed too expensive at the time, but there were to be no further restrictions on its use. In 1996, when sufficient funds had been accumulated, the Commission invited applications to "do anything they thought desirable ... to support worthwhile causes which would mark the year 2000 and the start of the new millennium." The plans called for the canals to be opened to their original operating dimensions, with of headroom above the water. The whole project had a budget of £78 million. On 14 February 1997, the Commission announced it would support the Link with £32 million of funding, 42% of the project cost. The Wheel and its associated basin was priced at £17 million, more than a fifth of the total budget. Another £46 million had to be raised in the next two years before construction could commence, with contributions from BWB, seven local councils, Scottish Enterprise, and private donations being augmented by £8.6 million from the European Regional Development Fund. After being asked to reconsider, a 20-strong team of architects and engineers was assembled by British Waterways. Under the leadership of Tony Kettle from architects RMJM, the initial concepts and images were created with the mechanical concepts proposed by the design team from Butterley and M G Bennetts. This was an intense period of work, with the final design concept completed in a three-week period during the summer of 1999. The final design was a co-operative effort between the British Waterways Board, engineering consultants Arup, Butterley Engineering and RMJM. Diagrams of gear systems that had been proposed in the very first concepts were modelled by Kettle using his eight year-old daughter's Lego. Drawings and artist impressions were shown to clients and funders. The visitor centre was designed by another RMJM architect, Paul Stallan. Inspirations for the design include a double-headed Celtic axe (a bearded axe), the propeller of a ship and the ribcage of a whale. Kettle described the Wheel as "a beautiful, organic flowing thing, like the spine of a fish," Since 2007, the Falkirk Wheel has been featured on the obverse of the new series of £50 notes issued by the Bank of Scotland. The series of notes commemorates Scottish engineering achievements with illustrations of bridges in Scotland such as the Glenfinnan Viaduct and the Forth Bridge. Construction In March 1999 Donald Dewar, the Secretary of State for Scotland, cut the first sod of turf to begin work at lock 31 on the Forth and Clyde Canal. The wheel was fully constructed and assembled at the Butterley Engineering plant in Ripley, Derbyshire. The structure was then dismantled in the summer of 2001, and transported on 35 lorry loads to Falkirk, before being reassembled into five sections on the ground and lifted into place. Construction of the canal required of excavation, a canal tunnel of diameter, aqueducts of and , three sets of locks and a number of bridges, as well as of access roads. of loosely packed backfill from the mining operations containing large sandstone boulders was not considered adequately solid foundation for the size of the structure, so deep foundations with thirty concrete piles socketed onto the bedrock were used. The damage, which cost £350,000 to repair, resulted in the dry well being flooded, damaging electrical and hydraulic equipment. ==Operation==
Operation
Structure The wheel has an overall diameter of and consists of two opposing arms extending beyond the central axle and taking the shape of a Celtic-inspired double-headed axe. Two sets of these axe-shaped arms are connected to a diameter central axle of length . Two diametrically opposed water-filled caissons, each with a capacity of , are fitted between the ends of the arms. The caissons, or gondolas, always carry a combined weight of of water and boats, with the gondolas themselves each weighing . It takes to power ten hydraulic motors, which consume per half-turn, roughly the same as boiling eight kettles of water. The wheel raises or lowers boats a total of , and two subsequent locks raise or lower boats another . Watertight doors Watertight doors at each end match doors located on the upper structure and lower dock pit. Due to space concerns, where a normal hinged door would dramatically reduce the useful length of the caisson, vertically rising hinged doors were chosen. The doors are raised from a recess in the base of the caisson and powered by a hydraulic lance when docked. File:Falkirk Wheel upper aqueduct door.jpg|Upper aqueduct door with U-shape seal and pumping system File:Falkirk Wheel locking mechanisms.jpg|Locking mechanisms include securing pin at the top and hydraulic clamp at the bottom File:Falkirk Wheel locking receptors.png|Securing pin and clamp receptors on a caisson (1 and 2), and a wheel securing pin receptor (3) File:Falkirk Wheel doors and seal.png|Left to right: caisson door (behind the rail) aligned with basin door but with a gap, u-shape seal extended, water filled, and doors lowered File:Falkirk Wheel doors in operation.webm|The doors being lowered at the lower canal basin Engine room The area housing the machinery to drive the wheel is located in the final pillar of the aqueduct, and contains seven chambers connected by ladders. Each end of each caisson is supported on small wheels, which run on rails on the inside face of the diameter holes at the ends of the arms. Since the wheel opened, around 5.5 million people have visited and 1.3 million have taken a boat trip, with around 400,000 people visiting the wheel annually. ==See also==
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