What is the purpose of the structure/ project?

This is going to be the new entrance to the Pick a Pay in the centre of the mall.  A concrete floor was removed in order to accommodate this changes.

In order to get the trusses to the designated area where the work was done, we’ve designed and constructed a walk way out of Ultra Span trusses. This was used by all of the construction teams to get to the working site without damaging the existing roof.

What was the brief to the architect?

A model was built of parts of the projects that the architect used to explain to all parties involved what the look was that they were going for.  There were constant communication with the architect to address the challenges.

Was the project envisaged in steel from the start? If not – why was it built in steel in the end?

Light gauge steel was mentioned by the project Engineer.  The reason for this was the location of the site within the mall, time frame to close the roof, flexibility with the change of dimensions (should something change).  The walk way was proposed to the contractor and customer as a precaution and to speed up 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?

The bulk of the main truss were made from the 140×1.2 chord and the webs were 76 x 0.8mm material.

Give a brief description of the cladding process (complexity, difficulty, innovation etc)

The roof structure had to be constructed over a live mall.  The location of the structure was the next challenge. The opening was close to the centre of the mall and no crane could reach this from the outside.  The use of a crane from the inside was impossible as this would obstruct the doors of Pick n Pay and other major stores in the mall.  The open roof area was a concern as well.  The whole job was done during night shift not to interfere with the normal trade of the shops in the mall. See picture of the Ultra Span walk way that was constructed on the existing roof.  The design was done inhouse and then chedked by MiTek. This walk way made it possible to carry all the Ultra Span material to the working area for erection.  This was the first time the mall owner could see the roof from the top.  The walkway also remained on the roof as the Mall owners now use this for their routine maintenance on the roof.

Give a brief description of the Light Steel Frame Building element of the project. (Notable features/ achievements made possible by LSFB)

The main truss were made in 2 parts to transport the truss to site and to be able to carry the truss on the roof using the walk ways. Work on the roof could only be done from 19:00 to 06:00 at night as the mall was still trading during normal working hours. The Ultra Span Trusses had to clear the existing heavy steel truss apex.  These trusses were removed after the Ultra Span trusses were in place.  The trusses were boxed (brace-frame) between trusses so that they could be moved as a unit.

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.

Initially the steel trusses would be left exposed but a ceiling was later requested. Two frames (Ultra Span) were made that would be attached to the main Ultra Span Truss. This was then finished by the cladding specialist on site. This gave a finished look with the steel trusses still partly visible. (see pictures)

How did the project team work together (e.g contractor involved early, challenges/ ease of communication etc.)

The customer and contractor had a tight time line to complete the project. The quick assembling of the Ultra Span Trusses helped them to stay on track and the additional Ultra Span Walkway had a big impact on the movement of the teams on this part of the project.

Tons of LSF used 4.7 Tons
Span of trusses and Kg/m2 (if applicable) 15m
Profiles used Ultraspan Profiles

 

Type of cladding Widedek (Safintra)

Project Team

Project Team Role Company
Nominator Martek Roofing
Client/ Developer Nitruco
Architect Piet Tempel & Associates
Structural Engineer Enducon
Engineer Not provided by nominator
Quantity Surveyor Not provided by nominator
Project Manager Not provided by nominator
Main Contractor Nitruco
Steelwork Contractor Martek Roofing
Steel Erector Martek Roofing
Cladding Manufacturer Not provided by nominator
Cladding Supplier Select Projects
Cladding Contractor Select Projects
Corrosion Protection
Galvanising
Not provided by nominator
Corrosion Protection
Paintwork Contractor
Not provided by nominator
Photographer, Photo competition Sakkie Maritz
Photographer, Other submitted images Not provided by nominator

If you were a part of this project, and your company details are incorrect or missing – please notify the SAISC so that the error can be corrected.