Work Package D2 of Sanral's Gauteng Freeway Improvement Project (GFIP) has come one step closer to completion with the placement of the 140-t Lynnwood Glen pedestrian and pipe bridge on 20th December 2009. The single span steel bowstring arch bridge, designed by ARQ, spans 72.5m at a skew of 16° to N1 below. The new bridge replaces the old prestressed reinforced concrete bridge, which was demolished to accommodate the widening of the N1 as part of the GFIP.

The bridge support a 3m wide pedestrian walkway and two water mains, one 750mm dia. and another 250mm dia. The process to lift the bridge made use of the biggest crawler crane in South Africa, with a lifting capacity of 850 t. In order to complete the project, the N1 between the Atterbury and Lynnwood interchanges was closed from 05:00 to 12:00, with the actual lift taking about 30 minutes.
 

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