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Civil Engineering heritage: Scotland - Lowlands and Borders
Date 2007
Event ID 609866
Category Descriptive Accounts
Type Publication Account
Permalink http://canmore.org.uk/event/609866
This three-span steel cantilever bridge was erected over the Earn from 1904–05, the first of its kind in Britain. It is 200 ft long with two anchor spans of 52 ft each and a cantilevered centre span of 86 ft and contains 182 tons of steel. The interest lies in two arms of the cantilevered centre span, which meet at a pin-joint at mid-span, without the more usual suspended span joining their ends. This form gives maximum slenderness at mid-span, and offers a convenient location for a movement joint.
The construction is of four tapering plate-girders carrying the roadway, with footways cantilevered off the
side girders. The plate-girders have curved soffits giving the bridge a slender appearance, somewhat marred now by some unsightly service pipes. The bridge, made and erected by Sir William Arrol&Co., was strengthened and refurbished in 2000 and won a SaltireCivil Engineering Awards commendation on PHEW’s
recommendation ‘for achieving high quality preservation whilst unobtrusively strengthening Arrol’s original
structure’.
R Paxton and J Shipway 2007
Reproduced from 'Civil Engineering heritage: Scotland - Lowlands and Borders' with kind permission from Thomas Telford Publishers.
