What is the purpose of the structure/ project?

Designed to be a traffic intersection regulator.

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

Yes.

Give a brief description of the structural framing. What type of sections were used (e.g. hollow, cellular, I beams etc) and why?

The gantry consisted of only circular hollow sections from the main frame and bracing to the support columns.

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.

All the connections on the CHS had to be profiled and the girder section had to be pre-cambered. Fabrication had to allow for safe transportation as the sections were abnormal loads delivered in Johannesburg CBD. Assembly of the bridge had to be carried out in an allocated area in close proximity to the site, in order to minimise road closure time. Once the main gantry was assembled it was moved into place with a truck and dolly and the erection began in the allocated 1 day road closure.

What is special/ unusual/ innovative/ aesthetic about the steelwork/cladding in this project?

Traffic was cordoned off for about 6 hours to allow the tandem lift of the bridge into its final position. Pre assembly was done approximately 1Km away from the actual site. This intersection is highly populated and carries heavy traffic during the day. The project will aid in reducing intersection confusion due to lack of robots and appointed personal to direct traffic. 

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

Like a well-oiled machine – Close coordination between MPW Steel construction, JRA and JMPD was essential to ensure the erection process was completed in a safe and efficient manner. Traffic was diverted around the designated area between Empire road and Clarendon.

Tons of structural steel used 19.4 TONS
Structural profiles used ONLY CHS

Project Team

Project Team Role Company
Nominator MPW STEEL CONSTRUCTION
Client/ Developer JOHANNESBURG ROAD AGENCY
Structural Engineer JG AFRIKA
Main Contractor MPW STEEL CONSTRUCTION
Steelwork Contractor MPW STEEL CONSTRUCTION
Steel Erector MPW STEEL CONSTRUCTION
Photographer, Photo competition MPW STEEL CONSTRUCTION

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.