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Cumulates monthly issues and includes additional material.
In 1913, the Algoma Eastern Railway swing bridge at Little Current was constructed as part of a 140km rail link from Sudbury to Little Current linking Manitoulin Island to mainland Ontario. It is the only land link between Manitoulin and the mainland. The Little Current Swing Bridge, representing the best in contemporary engineering, was listed in the Ontario Heritage Bridge program in 1983. It is a rare survivor with much of its mechanisms remaining and in working order. 175m long, it consists of two 21.7m fixed girder spans, a 113m through truss swing span with equal arms, and an 18.6m fixed girder span. The large 850t swing span (one of the largest in Canada) rotates on a centre pier. In 1945, the bridge was converted to dual use and in 1982, when acquired by MTO, it was restricted to vehicular traffic. Over the years, it has undergone minor modifications yet still retains most of its major elements. In 1999, MTO retained Stantec to design the modernization and automation of the operation of the 86 year old structure because of concerns about its operational reliability. Being a Heritage structure, the operation, outward appearance and colour had to be maintained. A sophisticated design resulted, allowing complete operation of the bridge by the push of a button. Mechanical rehabilitation consisted of replacement of the main and wedge drive systems with a more direct drive system located under the swing span to improve efficiency and reliability. For the covering abstract of this conference see ITRD number E211271.
The York Boulevard High Level Bridge is a medium span, double-cantilever truss which spans the Desjardins Canal at Hamilton, Ontario. The bridge was constructed in 1931-32 to designs prepared by James, Proctor and Redfern Limited and included a contribution by the eminent Canadian architect, John M. Lyle. By 1985 it had been determined that the bridge required a major rehabilitation program including structural alterations. The rehabilitation was intended to ensure that the bridge be capable of carrying loads in accordance with the current Ontario Highway Bridge Design Code and that modifications be made as required to restore the bridge to a condition whereby it could be expected to serve with minimum maintenance for the next 50 years. In addition, special efforts were made to respect the historic nature of the bridge, which is a designated heritage structure in the Province of Ontario. The bridge comprises two cantilever trusses which support a suspended span connected to the cantilevers by a system of links and pins. A key feature of the rehabilitation program was the elimination of the links and pins so that the bridge was converted into a continuous struss structure. The complex methodology for accomplishing this was included in the contract documents together with risk management procedures whereby it was a requirement of the contract that the structural steel fabricator check the methodology in detail. The procedure was successfully implemented. The bridge was formally reopened to traffic in July 1988 by Her Royal Highness, The Princess Margaret. The efforts made in the design to respect and restore the heritage features of the bridge, together with the successful execution of high-risk undertakings such as the removal of the links and pins which previously supported the suspended span, resulted in the Rehabilitation of the York Boulevard High Level Bridge receiving an Award of Merit in the 1989 Association of Consulting Engineers/Canadian Consulting Engineer Awards Program as one of the year's outstanding bridge engineering undertakings in Canada. For the covering abstract of the Conference see IRRD Abstract no. 807839.
A national overview of planning for the built environment as it is structured throughout Canada. Outlines the major programs of the non government Heritage Canada Foundation. Gives an overview of heritage legislation, policies and programs for each province and territory and discusses three levels of administration - provincial, municipal and private.