Construction World December 2016

AUAS HILLS RETIREMENT VILLAGE

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. it became evident that earth-retaining measures were necessary in order to stabilise the exposed embankments as a result from excavation activities. During the planning stages of the upmarket Auas Hills Retirement Village, situated in Auasblick, Windhoek, 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. previous sucsessfull projects of this intricate nature, the architect went ahead with designing his concept. The architect met with Frikkie Swanepoel two years ago to dicuss the formwork involved. Based on BOSJES CHAPEL

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

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Project information • Company entering: PERI • Client: Longworth & Faul

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.

2 16 BEST PR O JECTS

DECEMBER • 2016