The project entailed the construction of a roof structure. Law wanted non combustible material. Cater for hospital demands. Theatre weights, solar full out etc.
What was the brief to the architect?
Due to previous med clinic Projects non combustible material was require – Mitek ultra-span was the preferred choice.
Was the project envisaged in steel from the start? If not – why was it built in steel in the end?
Yes, MiTek ultra-span can clear span up to 40m. Opted the best product for the project.
Give a brief description of the structural framing. What type of sections were used (e.g. hollow, cellular, I beams etc) and why?
Mitek Ultra-span consist of cold rolled, special designed ,sections in various profiles and thickness. One sided assembly and cut to length.
Give a brief description of the cladding process (complexity, difficulty, innovation etc)
Cladding conventional and user friendly
Give a brief description of the Light Steel Frame Building element of the project. (Notable features/ achievements made possible by LSFB)
We used inverted shape trusses of Mitek ultra-span components. With truss spans ranging between 14m and 20m clear spans in Mitek ultra-span light steel framing.
Were there any challenges in the fabrication of the project from the engineer’s design – if yes, please tell? Tell more about fabrication and erection process if it was complex, difficult, innovative etc.
The roof trusses where manufactured in Rooftek’s factory and have been transported to site. Sections of roof +-150m² could be assembled simultaneously and then lifted in position.
What is special/ unusual/ innovative/ aesthetic about the steelwork/cladding in this project?
The roof structure was detail to be supported in-between the concrete ring beams on brackets. Some places the trusses needed to support on the RC beam (shafts etc) This created challenges (Design, cost and erecting)
MiTek Engineering Cape town (Designer Jaco van Wyk) came up the required framing solution that is more cost effective in a variety of fields throughout the project, i.e. The erecting of the roof structure made simpler by assembling portions of the roof structure on the a concrete slab and lifting the required sections into place, reducing cost of the amount of connections of the trusses to the concrete ring beams, opening new opportunity for services (water pipes and electrical cables) to be connected to the concrete ring beams and reducing torsional moments on the concrete ring beams.
The inverted shape roof truss provided a structurally sound roof structure that was design to accommodate services like a/c units and ducting and Solar PV panels to the one elevation of the roof structures
How did the project team work together (e.g. contractor involved early, challenges/ ease of communication etc.)
The project was driven By Kalahari (Rooftek) since the tendering process of the project. All designs aspects and complication of the roof structure was discussed with MiTek, the architect, engineer and project manager on site prior to the final designs to eliminate most of the manufacturing and erecting of the roof structure.
The project management on this project was managed with excellence like:
- The box-gutter detail required on the project.
- To fit in with the previous buildings.
- The additional steel sprockets to match the existing.
Excellent communications via e-mails and site meeting of all parties involved with the require roof structure made the completion of structure a smooth process.
|LSFB / LIGHT STEEL FRAME BUILDING WORK|
|Completion date of LSFB work||2019|
|Tons of LSF used||27478,85 kg|
|Span of trusses and Kg/m2 (ifapplicable)||Span 15920m|
Designed & Inspection (MiTek)