Civil Designer Showcase

THE OUTENIQUA MOUNTAIN PASS


The Outeniqua Pass is a mountain pass in the Western Cape, South Africa, at an elevation of 800m above the sea level, that carries the N9/N12 national road through the Outeniqua Mountains north of George. It connects George and the Garden Route coastal plain with Oudtshoorn and the Little Karoo. It was constructed between 1943 and 1951, replacing the Montagu Pass as the main route from George to the interior.

The Outeniqua Pass was engineered for modern motoring and it took eight years to construct the 14.5-kilometre route because the rock was so hard and difficult to drill for dynamite charges. In order to create gradients that would be gradual enough for reasonable traffic speed, the construction workers had to blast huge cuttings out of the mountainside. The biggest was 20 metres wide and the material blasted out was used in rock fills up to 30 metres deep. The pass was officially opened in 1951.

OUTENIQUA MOUNTAIN PASS
The Outeniqua Pass Upgrade


RECONSTRUCTION AND UPGRADE
The reconstruction and upgrading of Trunk Road 1/1: George Holgaten (Outeniqua Pass) involved approx. 13km of existing road being widened to include intermittent auxiliary lanes, surfaced shoulders and
 
OUTENIQUA MOUNTAIN PASS
Reconstruction and upgrading of Trunk Road


improved drainage. A second key objective was to rehabilitate and strengthen the road pavement. Widening was achieved by cutting in solid rock (146 000m) and the construction of a few large fills. Structures included an 88m long viaduct (R1.3m) and several gabion retaining walls, the largest having a volume of 540m. The road pavement was widened and strengthened by placing approx. 60 000 tons of asphalt on base, surfacing and wearing course. Demanding environmental requirements were applied and revegetation work was also undertaken.

The project was completed in 2006.

SOFTWARE USED
Civil Designer, the fully integrated infrastructure software solution developed by Knowledge Base, was used by Kantey and Templer for the reconstruction and upgrading. www.civildesigner.com

CONSULTING ENGINEERS ON PROJECT
Kantey and Templer
www.kanteys.co.za


 
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