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BEST
PR
O
JECTS
39
DECEMBER • 2016
AUAS HILLS RETIREMENT VILLAGE
Project information
• Company entering: Namwall
• Specialist supplier: Terraforce
• Client: Stefanutti Stocks
• Project start date: 15 May 2014
• Project end date: 1 March 2015
• Main contractor: Stefanutti Stocks
• Project value: NAD2 400 000 000
In addition to the walls inside the property, a river running
alongside the retirement village needed erosion control retaining
walls, in case of heavy water run-off during the rainy season.
Steffanuti Stocks, the main contractor on site, approached
Namwall, a Windhoek-based, Namibian licensee for Terraforce, to
provide a design for Terraforce block-retaining walls.
“We consulted with Terrasafe, Terraforce’s professional design
service, and had a design ready in no time,” says Namwall’s Chris
Schutte. “Most of the proposed rock-face block walls were pretty
straightforward, with the higher ones requiring a double skin
of L12 blocks for extra reinforcement. In total about 25 000 blocks
were installed.”
The project was completed with Andre’s Landscaping adding
the final touches to the walls.
During the planning stages of the upmarket Auas Hills
Retirement Village, situated in Auasblick, Windhoek,
it became evident that earth-retaining measures
were necessary in order to stabilise the exposed
embankments as a result from excavation activities.
BOSJES CHAPEL
Project information
• Company entering: PERI
• Client: Longworth & Faul
The intricate chapel roof is 20 m long x 12 m wide and 6 m high at
the top apex. It was agreed that a 1:50 quarter concrete demo ‘cup’
is constructed at the Cape Town demo area. The client, architect,
engineer and the whole Bosjes project team were involved and
also present when the gunite was done. A lot of detail and input
was given with regards to the rebar/steel, spacers and practical
application placing the concrete.
It was proven that Gunite was inadequate and the scope
changed to shotcrete. This proved again that concrete demo
samples be done from the start, which is extremely important
when doing these very intricate formwork project.
The formwork erection and concrete placing was programmed
for 12 weeks but took much longer due to the spesialised
carpentry involved , and the inclement Cape Town winter weather.
PERI Cape Town's Edmund Jenneke and Theo Conradie were
involved from the start with the set-out points. PERI formwork
proposal and actual solution was to break this structure down to
see it as simple as possible. It workshopped this and decided to
‘build a ship' and ribs/trusses.
Theo Conradie used Autodesk inventor and designed 584
trusses. PERI procured rooftrusses from a reputable supplier and
manufacturer. Trusses were delivered to the Cape Town branch as
per construction programme priority sequence. All trusses were
properly marked and checked for alignment before delivery to site.
Concrete finish required
• Smooth, and would be skimmed skimmed afterwards.
The architect met with Frikkie Swanepoel two years
ago to dicuss the formwork involved. Based on
previous sucsessfull projects of this intricate nature,
the architect went ahead with designing his concept.
Sequence of formwork erection
• Shoring towers c/w platforms was erected set-out points and
levels plumbed and checked.
• Trusses placed in position from below and from the top
• 38 mm timber battens was fixed horizontally as temporary and
false formwork
• Shutterply was fixed in layers, 12 mm + 4 mm final layer
PERI's design capabilities was put to the test and Theo Conradie
excelled at designing all the trusses and the full project. There was
no crane on site and all formwork, including the timber trusses,
were placed by hand.
The construction sequence was not easy. The full project
team was involved. PERI initiated the PERI template of involving all
parties involved and it created the Architectural Concrete
Team template.