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DECEMBER • 2016
Construction
WORLD
38
Specialist Contractors or Suppliers
B
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
27 WALE STREET
Project information
• Company entering: Sika
• Client: Cape Town Department of
Transport and Public Works
• Main Contractor: Indawo
Sika’s globally acclaimed Concrete Repair and
Protection Systems was the first choice for consultants
Naylor Naylor and van Schalkwyk for 27 Wale Street,
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.
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.
ALICE LANE PHASE III
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.
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.
• 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.
Project information
• Company entering: PERI
• Main contractor: WBHO