The CTICC Skybridge was intended as an above-ground link between CTICC 1 on the West of Heerengracht Street and CTICC 2 on the East. The client asked the Architects to design an enclosed pedestrian skybridge to connect the Cape Town International Convention Centre (CTICC 1) with the CTICC East Expansion (CTICC 2) across the busy Heerengracht Street. Development of the CTICC skybridge was considered critical in enabling the two buildings to function as a single integrated international events hosting venue and providing a seamless visitor’s experience.
The curved skybridge with its slender slanted steel columns has an unusually dynamic aesthetic from outside. The curved route inside provides a dynamic visual experience as one moves across the bridge in anticipation of an obscured end destination. The indirect travelling direction guides the visitor’s gaze outwards and across the historic Heerengracht Street and allows the bridge to become a unique destination in its own right. This purposefully iconic structure pays tribute to CTICC’s core purpose of ‘connecting people’.
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. Universal Beam and Column sections were chosen to frame the concrete floor and roof, which were both cast in sections in between these steel members, with support provided by Bondek sheeting. Universal Column sections were also chosen for the Vertical members, in order to frame the glass panels.
Circular hollow sections, however, were chosen for the diagonal members to minimise the disruption of the view. The same members were also used for horizontal bracing at the roof and floor level, to keep the section sizes down. Large circular hollow sections were also used for the slanting support columns.
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 the temporary support of the bridge during erection. This was overcome by introducing the temporary towers, which made the installation much simpler and safer.
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||September 2018|
|Completion date of full project||November 2018|
|Structural profiles used||UB, UC and CHS sections|
|PROJECT TEAM ROLE||COMPANY|
|Nominator||Anchor Steel Projects|
|Client/ Developer||Cape Town International Convention Centre|
|Architect||Convention Architects – a JV between Makeka Design Lab cc, SVA International (Pty) Ltd and van der Merwe Miszewski Architects (Pty) Ltd|
|Quantity Surveyor||Turner & Townsend|
|Project Manager||Lukhozi Engineers|
|Main Contractor||Superway Construction|
|Steelwork Contractor||Anchor Steel Projects|
|Steel Erector||Anchor Steel Projects|