oa Civil Engineering = Siviele Ingenieurswese - Unique substructure design on Centurion bridge
Engineers faced a variety of challenges on a new bridge over the N 1 at Centurion, but the foundations required special care Stringent constraints on the new John Vorster Drive interchange bridge in Centurion with respect to aesthetics, traffic flow and difficult founding conditions presented the design team with formidable challenges. The project received a Pretoria Branch Award for Excellence in Civil Engineering and was nominated for last year's SAICE National Award. Completed in January 1998, the bridge had to be constructed without disruption to the exceptionally high volume of traffic that passes beneath its portals on the N 1 to Pieters burg. Moreover, the structure had to conform aesthetically with the existing adjacent' bridge, presenting the design team with fixed concepts in terms of the type of bridge, span lengths, abutment and pier configuration and alignment. Matters were further complicated by the soil conditions being among the worst for founding in dolomitic areas encountered by the geotechnical specialists involved.
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