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Continued...
The movement of the bridge is achieved by a telescopic, two stage hydraulic
cylinder. This is powered by three 132kW power packs providing enough pressure
to generate up to 660 tonnes. The bridge will still lift, but more slowly, even
if only one of the power packs is operating.
Trunnion bearings at the base of the ram and a pivoting clevis at
the top allow the ram to rotate approximately 7ยบ either side of vertical as it
raises and lowers the bridge. The whole assembly stands in a reinforced concrete
chamber beneath the north abutment, where the master control cabinets are also
located. A slave cabinet in the south abutment provides control and power to the
vehicle and pedestrian barriers, as well as the bridge lighting.
Bennetts were responsible for the performance and design specifications for the
electrical, hydraulic and mechanical equipment required to move the bridge, to
accompany the exemplar design drawings used by the contractor for construction
detailing.
Additional to the mechanical aspects we fully designed, detailed
and analysed the castings for the hinges which hold the 420mm dia. spherical
plane bearing. The diameter of the holding down bolts were machined to give a
precise fuse effect to protect the substructure on the hinge side of the canal.
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Uses one of the largest hydraulic cylinders in the
UK; 18.2m stroke, 910mm first stage, 800mm second stage. |
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Raises in 555 seconds, lowers in 390 seconds. |
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Opens approximately 12 times a year |
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Master and slave sides linked
across the deck via a cable reel. |
For more information, contact us on 01709-373782
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