Construction World December 2016

B

Specialist Contractors or Suppliers

27 WALE STREET

The scope of works included structural and spalling repairs, waterproofing and painting of the entire facade of the building. Spalling repairs involved removal of all concrete and ribs until sound concrete was reached, when a coating of Sika FerroGard-903+ was applied. Designed for use as a surface-applied impregnation of steel reinforced concrete, Sika Ferrogard-903+ is a mixed corrosion inhibitor, based on organic compounds that penetrate the concrete to form a protective monomolecular layer on both cathodic and anodic zones of the reinforcing steel. This exceptional product with its advanced formulation that delays the onset of chloride-induced corrosion in hardened concrete, meets numerous international standards. Due to the CBD location of the building and the fact that there were people working inside the building during the renovations, the smallest breaker was used in order to minimise impact and vibrations, as well as keep noise levels as low as possible. After hours applications were carried out using larger breakers when necessary. Potential pollution to the city was prevented by installing platforms with catch netting which served to catch rubble, product, or any other debris that might fall off the building, due to the work a prominent government building in the city centre of Cape Town. Commissioned by the Department of Transport and Public Works, construction company Indawo began the challenging project in March 2015. Sika’s globally acclaimed Concrete Repair and Protection Systems was the first choice for consultants Naylor Naylor and van Schalkwyk for 27 Wale Street, ALICE LANE PHASE III Alice Lane Phase III is the third phase of the exciting Alice Lane Precinct, which consists of three distinctive buildings linked by a public piazza. The site is located in the busy heart of Sandton and ideally suited for the inaugural use of PERI’s RCS hydraulic self-climbing system – a rst for South Africa. Having already successfully completed the rst two phases of the Alice Lane Precinct, WBHO was appointed as the main contractor for the next phase of this prestigious project. Intelligent and strategic planning allowed WBHO to select a system that would alleviate the crane time required for construction of critical path elements on the project. PERI Formwork Scaffolding Engineering South Africa was awarded the contract for the supply of formwork, and used the RCS hydraulic self-climbing platforms on the lift core structures. The lift core structures posed some special challenges, which included: changing door opening levels and locations, varying pour heights and changes in shaft geometry, which varied from closed boxed sections, to open U-section scenic lift arrangements. To accommodate these challenges, PERI’s design and projects teams engineered the following processes: • Customisation and strategic positioning of the RCS system, to successfully accommodate the scenic lifts.

Project information • Company entering: Sika • Client: Cape Town Department of Transport and Public Works • Main Contractor: Indawo

being carried out, and then disposed of in the correct manner. Health and safety officers from Ingozi Management Safety and Health Consultants were on site daily to ensure proper safety measures were met. External construction work on any building in a central business district (CBD) poses significant environmental and safety issues and when the building is in the centre of Cape Town, one of the world’s top tourist destinations, these issues are exacerbated. The safety of all pedestrians, motorists, tenants as well as construction staff was of paramount importance.

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Project information • Company entering: PERI • Main contractor: WBHO

• Positioning of the RCS rails and climbing shoes in the walls with the door openings. Because of the varying heights of the slab levels, anchor hole locations were pre-drilled to ensure perfect positioning in the header beams. • Structural changes also in uenced the VARIO wall formwork design, as internal shutters had to be designed to accommodate the ground oor shaft openings, due development into scenic lift geometry. • The exibility of the RCS platforms ensured that planned in-situ modi cations were easily completed once they emerged from the closed shaft formation at ground level.

Construction WORLD

DECEMBER • 2016