The Naspers Skybridge is a pedestrian link between the CTICC 2 building and the Naspers building. The client tasked the architect with designing a new bridge between the new CTICC 2 building and the NASPERS building. This would aid in daily access for Media24 staff, as they did not have enough parking of their own and could then utilize some of the parking bays in the CTICC buildings. This new bridge had to link CTICC 2’s Second Floor with NASPER’s Fourth floor, roughly 13.5m above the road level.
Due to the location of the entrances to the buildings, the bridge curves for about half of its length. This creates an interesting architectural experience as one crosses the bridge, while making it possible to see the bridge’s exterior from the inside. Structurally the challenge was to support the curved section only on two columns, with the end part at the CTICC not being able to be supported by the existing building (thus creating a large cantilever that had to have minimal movement at the façade entry point).
The bridge was always envisaged as being constructed out of steelwork – to allow maximum views to the sides and to enable construction with minimal disruption to the street below. The bridge structure comprised mainly Universal Beam and Column sections, with some angles added to support the flooring and a CHS safety rail for window cleaning.
Challenges arose due to the weight of sections, which made moving these sections a challenge during both fabrication and erection. The bridge sections were assembled into just two pieces adjacent to the road, allowing these two large pieces to be erected using a 440t crane during a road closure on a Sunday. The two parts had never been spliced together before erection, with all dimensions being theoretical. The first real fit was therefore on site, and everything fitted perfectly.
Another challenge was erecting the bridge on a windy and rainy day, forcing the contractor to wait for a lull before lifting.
Since the bridge was modelled in 3D, an IFC export was provided to the contractor to aid them in the shop drawing process. In turn, they provided their fabrication model in 3D for approval by the engineer and architect, which ensured that the aesthetic intentions of the professional team could be met.
|Completion date of steelwork||October 2018|
|Completion date of full project||March 2019|
|Tons of structural steel used|
|Structural profiles used||UB, UC and CHS sections|
|Completion date of cladding||No cladding|
|Cladding profile/ type used||Rheinzink|
|Cladding area/ coverage and tonnage||165m2|
|Nominator||Anchor Steel Projects|
|Client/ Developer||Cape Town International Convention Centre|
|Architect||Osmond Lange Architects + Planners|
|Quantity Surveyor||Turner & Townsend|
|Project Manager||Lukhozi Engineers|
|Main Contractor||Superway Construction|
|Steelwork Contractor||Anchor Steel Projects|
|Steel Erector||Anchor Steel Projects|
|Cladding Supplier||Two Oceans Metal|
|Cladding Contractor||Naturally Slate|