Having spent a very busy 40-year career in the construction business, Avi Bhoora, executive: Construction Materials, AfriSam, is concerned by the negative attitude of many young people towards this field of work. “I do worry about the number of young South Africans who seem to have taken a conscious decision not to enter an industry like ours,” says Bhoora. “There appears to be a strong preference for an ‘office job’ rather than the often-difficult conditions of working on a construction site, for instance.” Such attitudes make it difficult for companies like AfriSam to compete for the best talent among school-leavers or college graduates, he says. It is therefore vital for the industry to change this view among potential new entrants, and to highlight the potential for meaningful and rewarding careers. A future-proof industry “I have spent my whole life in construction and, as I approach retirement, I am inclined to reflect on how the sector is going to renew itself – so that it can continue delivering into the future,” he says. An important starting point is for the public to appreciate more clearly that every city, road, bridge, dam, school, hospital or other engineered structure comes from the work of skilled contractors and their supply chain. “Materials like aggregate must be extracted from the earth to make the concrete for this infrastructure; it is difficult work, but essential for progress,” says Bhoora. “If the youth can be inspired by these messages, perhaps we can start changing the value they place on the occupations this field offers,” Bhoora concludes. attractive to CEMENT & CONCRETE Making construction the youth Avi Bhoora, executive: Construction Materials, AfriSam IMIESA September 2022 49 Youth can look forward to meaningful and rewarding careers in the construction industry used. Preferred stone size is 9.5 mm or about a quarter of patch thickness,” Perrie continues. Where circumstances do not permit a designed concrete mix, trial mix proportions may be used. The correct proportions will permit opening to traffic with pneumatic tyres after three days, and to traffic with solid tyres after four days, provided that the joints can be sawn and sealed within this time. Perrie says the recommended finishing procedure is to screed from the centre of the patch out to the patch boundaries to promote good bond with vertical concrete faces. Curing should follow immediately by covering the patch with polyethylene sheeting sealed at the edges and maintained in place until the removal of the polystyrene filler. “When it comes to successfully repairing spalled joints, important aspects include: the need for clean and dry joint interfaces prior to sealing; priming of joint sides for liquid sealants; providing the proper joint shape factor for liquid sealants; using a bond-breaking cord of closed-cell expanded polyethylene foam; and a bond breaker for liquid sealants. The undersealing of joints – usually 3 mm to 5 mm – is also important,” Perrie concludes. For further details, consult the CCSA leaflet, Repairing spalled joints in concrete floors, phone +27 (0)11 315 0300 or visit www.cemcon-sa.org.za. Before any repairs are carried out, it should be determined if the spalling is due to a loss of load transfer at the joints.”
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IMIESA September 2022 51 Situated in the Kariba Gorge of the Zambezi River basin between Zambia and Zimbabwe, the Kariba Dam provides hydroelectric power to both countries and has been in operation since 1960. The double-curvature concrete arch dam has six sluice gates that release water into Lake Kariba. Over time, the concrete has expanded slightly, affecting their smooth operation. Potentially, this could cause these gates to jam in either the open or closed position. As a countermeasure, the spillway gates are being refurbished one by one in a long-term project that commenced in 2019 and is scheduled for completion in 2025. The programme is being carried out by a consortium, comprising GE Hydro France and Freyssinet International, which was awarded the contract by the Zambezi River Authority. Temporary cofferdams Before works can begin, the contractors must first create a dry workspace at each gate so it can be refurbished. This entails building a small temporary cofferdam that clings to the dam wall on its lakeside. Experienced divers affix steel supporting members to the upstream face of the dam wall to allow the cofferdam to be put in place. Here, Pratley Putty was chosen as the best quick-setting solution. “Pratley Putty is ideal for use underwater but can also fill, seal, build up and bond almost any rigid material,” notes Eldon Kruger, marketing director, Pratley. A crane on the dam wall lowers the cofferdam pieces into place one by one. The water trapped between the cofferdam and the dam wall is then pumped out into the lake, creating the water-free space necessary for the refurbishment work. In the final phase of the overall programme, a new self-motorised gantry crane will be installed that can place an emergency gate in position to close any of the sluice gates. CEMENT & CONCRETE KARIBA SLUICE GATES rehabilitation ongoing Kariba Dam rehabilitation works in progress AECOM [email protected] AFI Consult [email protected] Alake Consulting Engineers [email protected] ARRB Systems [email protected] Asla Construction (Pty) Ltd [email protected] BMK Group [email protected] Bosch Projects (Pty) Ltd [email protected] BVI Consulting Engineers [email protected] CCG [email protected] / [email protected] Corrosion Institute of Southern Africa [email protected] Dlamindlovu Consulting Engineers & Project Managers [email protected] EFG Engineers [email protected] Elster Kent Metering [email protected] EMS Solutions [email protected] ERWAT [email protected] GIBB [email protected] GIGSA [email protected] GLS Consulting [email protected] Gorman Rupp [email protected] Gudunkomo Investments & Consulting [email protected] Hatch Africa (Pty) Ltd [email protected] HB Glass Filter Media [email protected] Herrenknecht [email protected] Huber Technology [email protected] Hydro-comp Enterprises [email protected] Infrachamps Consulting [email protected] INFRATEC [email protected] IQHINA Consulting Engineers & Project Managers [email protected] iX engineers (Pty) Ltd [email protected] JBFE Consulting (Pty) Ltd [email protected] JG Afrika [email protected] KABE Consulting Engineers [email protected] Kago Consulting Engineers [email protected] Kantey & Templer (K&T) Consulting Engineers [email protected] Kitso Botlhale Consulting Engineers [email protected] KSB Pumps and Valves (Pty) Ltd [email protected] KUREMA Engineering (Pty) Ltd [email protected] Lektratek Water [email protected] Makhaotse Narasimulu & Associates [email protected] Mariswe (Pty) Ltd [email protected] Martin & East [email protected] M & C Consulting Engineers (Pty) Ltd [email protected] Mhiduve [email protected] MPAMOT (PTY) LTD [email protected] Mvubu Consulting & Project Managers [email protected] Nyeleti Consulting [email protected] Odour Engineering Systems [email protected] Prociv Consulting & Projects Management [email protected] Rainbow Reservoirs [email protected] Re-Solve Consulting (Pty) Ltd [email protected] Ribicon Consulting Group (Pty) Ltd [email protected] Royal HaskoningDHV [email protected] SABITA [email protected] SAFRIPOL [email protected] SAGI [email protected] SALGA [email protected] SAPPMA [email protected] / [email protected] SARF [email protected] SBS Water Systems [email protected] Silulumanzi [email protected] SiVEST SA [email protected] Sizabantu Piping Systems (Pty) Ltd [email protected] Siza Water (RF) Pty Ltd [email protected] Sky High Consulting Engineers (Pty) Ltd [email protected] SKYV Consulting Engineers (Pty) Ltd [email protected] Smartlock [email protected] SMEC [email protected] Southern African Society for Trenchless Technology [email protected] SRK Consulting [email protected] Star Of Life Emergency Trading CC [email protected] TPA Consulting [email protected] V3 Consulting Engineers (Pty) Ltd [email protected] VIP Consulting Engineers [email protected] VNA [email protected] Water Institute of Southern Africa [email protected] Wam Technology CC [email protected] Wilo South Africa [email protected] WRCON [email protected] WRP [email protected] Zutari [email protected]
KWADUKUZA LOCAL MUNICIPALITY Upgrading electricity services in Cement and Concrete SA OBC Hall Longmore Holdings 10 IMESA - Institute of Municipal Engineering 2, 4 & 50 M & D Construction Group OFC Macsteel Fluid Control IFC Marley Pipe Systems 25 Rolkon Trenchless Technology 20 SAPPMA 27 Sika 31 Southern African Vinyls Association 33 Technicrete 35 Terraforce 47 Xylem Water Solutions South Africa 32 INDEX TO ADVERTISERS Initiated through the Vuthela iLembe LED Support Programme, KwaDukuza Local Municipality is installing a supervisory control and data acquisition (Scada) system and control room to monitor and manage its extensive electricity supply network. The initial groundwork began in 2016 under the scope of the Vuthela programme following a recommendation by the International Finance Corporation (IFC). The latter identified the need to implement a Scada solution to serve KwaDukuza’s approximately 46 000 customer base and its 120 MW capacity at maximum power demand. KwaDukuza is a licensed electricity service provider for most of the urban areas within its area of jurisdiction. In 2019, Zutari (previously Aurecon) was appointed to work on the functional design of the Scada and control room, scoping the integration of 15 existing 33 kV substations and six future 132 kV and 33 kV substations within the KwaDukuza and Mandeni municipalities. It further included specifications for setting up KwaDukuza’s central control room to operate and monitor the Scada, as well as recommendations for the human resources required. EU funding Towards the end of 2019, KwaDukuza, with the assistance of the Vuthela team, prepared a business plan proposal for submission to National Treasury, which requested funding from the EU under the fifth call for funding proposals. The submission was successful, and the process started in 2020. At present, KwaDukuza is in the procurement stage of the project, and Vuthela and the IFC will continue to support the municipality through the implementation phases. Improved efficiencies Recent studies into the loss of revenue from electricity within KwaDukuza found that several areas of data collection about customers and their usage could be improved. The new Scada system will provide up-to-the-minute information about usage in every section of the electricity supply network, allowing for faults and other anomalies to be identified instantly and suitably addressed. The Scada system is further complemented by an outage 52 IMIESA September 2022 ELECTRIFICATION management system to manage and resolve incidents at low-voltage level. KwaDukuza’s Scada project will drastically streamline the fault restoration process, improve the management of Eskom’s loadshedding programme, and simplify the operation of the medium-voltage network (11 kV) in the municipality. Local best practice examples A state-of-art Scada system is one of the most cost-efficient solutions. It helps utilities increase reliability through automation, lowers costs and enables problem areas to be detected and addressed automatically and remotely. As an example of local best practice, Centlec (the utility providing services in Mangaung Metro) implemented a Scada system in 2019, fully integrated to call centre services, allowing the utility to improve its performance in terms of network operations and customer care services. Another local example is the case of City Power, a City of Johannesburg entity, which since 2021 has integrated 51 substations into its new Scada system and plans to integrate another 29 power facilities during FY 2022/23.
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