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The tallest building in sandton

Project data

Location: Sandton, South Africa

  • SKYDECK for the basement slabs and tower slabs -  3000m² own with 2500m² supplementary rental
  • MAXIMO / TRIO for all retaining walls and internal walls - 700m² rental
  • Special HD Steel shutters for core shafts with working platforms and retrieving platforms on RCS - C 850m² purchased
  • Perimeter screen on RCS - P provides approx three levels of safe enclosed environment - 1300m² tower footprint x 12m high purschase
  • 900 x 900 Waffle moulds on Skydeck for basement and tower slabs, optimizing the decking system.

Requirements

Acclaimed architects, co-arc and interior designers Steven Falcke and Varoom, have been tasked to create Africa′s ultimate living experience embracing the latest in technology and energy efficiency luxury living in the sky.

The Leonardo will consists of  an international acclaimed lobby lounge, coffee shop, business and conference centre and reception area from where they will commute by lift to luxury apartments, penthouse and premium grade offices.

Customer

Aveng-Grinaker LTA

Customer's benefit

The Leonardo, currently under construction on Africa’s richest mile, has been a flag ship project for PERI Centurion the last two years. Supplying and designing various aspects of the formwork and shoring required for the building most notably the hydraulic climbing systems for the core and the key feature walls. PERI has provided un-rivalled support to the contractor, AVENG Grinaker-LTA, the professional team and Legacy Group for all the project requirements.

The construction of the basement and parking levels was done using the PERI SKYDECK system with varied propping heights, down – stand beams and slab thickness, SKYDECK proved to be the best system for the job.

Upon request by AVENG Grinaker - LTA, special steel panels were manufactured for the core to be combined with the RCS-C hydraulic climbing system, the second project using these system and the largest from a formwork and hydraulic component requirement. 900m² of steel panels supported completely hydraulically on 50 climbing brackets over 25 platforms, the large core was sub-divided into four “smaller” cores to create faster cycling times and optimized the design of the material.

The core is entirely crane independent with the use of standard and special formwork roll-back features as well as tilt-back shutters on the platforms the cycling times have averaged around working 8 days.

The most significant architectural feature of the building are “key-wall” columns carrying the entire on the mezzanine floor, the key-walls consist of 5 standard walls and 2 with an added side buttress. Each of these walls had to be cast in one single pour of 55 cubic metres of concrete of 70MP a concrete and 19 tons of steel reinforcing was placed inside these 11 m high walls.

The key to this design was having an internal frame that was able to resist:

• The concrete pressure with minimal deflection

• The uplift on the front inclined steel bullnose

• The dead load of the concrete above

And simultaneously remain functional and strippable to be moved to the next wall for concreting.

The design thus integrated the large straight VARIO GT24 side panels; inclined steel bullnose panels (front nose of the key-wall); straight vertical steel bullnose panels (back nose of the key-wall) and then for the buttresses of the end key-walls special steel shutters were manufactured with the face lining features to match those of the VARIO GT24 panels.

Detailed 3D designs were completed for the intricate details of each connection and for ease of understanding and site assembly for the team on site from AVENG Grinaker-LTA team, allowing for the completion of all 7 walls within 10 weeks.

 

PERI solution

By utilizing SKYDECK in basements and towers the system were applied optimally also allowing for the use of waffles in certain areas. The decking system did not require a swop out which eliminated any unnessary handling
and transport to and from site. With the program being an extremely tight affair, RCS-C was introduced on the core and RCS-P will be used as perimeter protection screen to allow for safe enclosed working environment to minimize the crane dependency.