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Upgrading of three historic arch bridges over the Orange River near Keimoes, South Africa

 Upgrading of three historic arch bridges over the Orange River near Keimoes, South Africa
Author(s): , , ,
Presented at IABSE Symposium: Engineering for Progress, Nature and People, Madrid, Spain, 3-5 September 2014, published in , pp. 1260-1267
DOI: 10.2749/222137814814067824
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This project is located on the South African National Roads Agency SOC Ltd’s (SANRAL’s) Route R27 near Keimoes in the Northern Cape Province of South Africa. The overall objective was to improve t...
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Bibliographic Details

Author(s):



Medium: conference paper
Language(s): English
Conference: IABSE Symposium: Engineering for Progress, Nature and People, Madrid, Spain, 3-5 September 2014
Published in:
Page(s): 1260-1267 Total no. of pages: 8
Page(s): 1260-1267
Total no. of pages: 8
Year: 2014
DOI: 10.2749/222137814814067824
Abstract:

This project is located on the South African National Roads Agency SOC Ltd’s (SANRAL’s) Route R27 near Keimoes in the Northern Cape Province of South Africa. The overall objective was to improve traffic capacity and safety of the route, with the main focus being the widening of four single traffic lane bridges over the Orange River floodplain. This paper reviews the upgrading of the three main historic arch bridges.

The project included a detailed hydrological and hydraulic assessment which resulted in the raising of two of the structures by approximately 2,5m to prevent overtopping of the structures during larger flood events. The largest of the three bridges, a ten span arch bridge, was at a higher level and the existing deck was therefore retained and widened. The raising and/or widening of the bridges had to comply with heritage requirements as these structures, completed in the early 1930’s, have significant historical importance. This resulted in the original form and appearance to be retained by using a similar arch configuration and detailing. Construction was completed in 2013.

Keywords:
aesthetics post-tensioning bridge strengthening Historic arch bridges major flood events precast concrete arches

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