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CiviC Tower GOULBURN ST, SYDNEY
The original concept for the tower floor plate design was for a post-tensioned concrete slab and beam arrangement with an overall depth of 420mm to cater for the live load of 4kPa, plus an additional 1kPa for superimposed live load and a 10kPa live loading for compactus zones. Involving NPCAA member Ultrafloor® in the planning stage, the engineering design team were able to bring about savings in construction time and floor zone thickness.
The programming challenge of the Civic Tower required a flooring system with a greater spanning capability, but with the speed of erection associated with precast concrete.
This led to the selection of the company’s metaldeck system, tested earlier at Melbourne University for structural integrity and resonant frequency. The rectangular beams had protruding shear reinforcement ties to ensure proper engagement between the topping and precast concrete, and provide longitudinal shear
capacity. Spacing the beams
typically at 1.7m, spanning up to
11m, and bridging the gaps with a
0.75mm gauge ribbed metal sheet,
the floor thickness was reduced to
370mm. This is made up of 250mm
deep precast beams and a 120mm
concrete topping thickness. RF82
mesh is placed over the deck
before the 32MPa grade concrete
is placed in-situ. The ends of the
beams are tied into the jump-
formed external elements. One row
of temporary midspan props was
the only other support. Up to 1000m2
of metaldeck floor needed to be
installed per day to keep up with
the tight construction programme.
Peter Whyte, Grocon’s Project
Manager added that “this flooring
system worked hand in glove with
the two jumpform systems, to cast
the core and exterior walls of the
building. A day after casting the
external and internal core, the
jumpform was raised to its next
position and construction of the
1000m2 floor slab began. The slab
was poured some 4 days later, and
the next day the window units,
on the corner of Castlereagh and Goulburn streets in the Sydney CBD, Grocon was developer and builder of Sydney’s Masonic Centre. The new tower is supported by a complex transfer structure comprising massive inclined concrete-filled fabricated steel tubes and post-tensioned concrete tie beams forming the base floor of the tower. The whole tower of some 1000m2 floor plate is founded upon the existing Masonic lift core of only 200m2.
Head Contractor: Grocon
Structural engineer: Connell Wagner
Architect: PTW Architects
Ultrafloor Footprint: 30,000m2
Address: Cnr Goulburn & Castlereagh St’s, Sydney
Construction Type:
Office Tower – Jump formed external walls and core walls using Ultrafloor’s Megabeam spanning 11m with metal deck infill between beams at 1700mm c/c
ABN • 83 114 703 838
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mechanical services ducting, sprinkler pipework and other sundry materials were all preloaded onto the open deck prior to commencing the floor beams for the floor above”.
The construction of the entire 25 storey tower structure, took only five months. This is a record and is directly attributable to the innovative Ultrafloor® metal deck flooring system.
PROJECT LIST – Commercial / Industrial
NSw
Civic Tower Goulburn St, Sydney 28,000m2
SUPERDOME Olympic site, Homebush 19,300m2
Big Box Self Storage 26 Parsons Street, Rozelle 6,200m2
21 - 23 Atchison Street, Wollongong 5,200m2
Portside Distribution Centre 2-8 McPherson Street, Banksmeadow 4,600m2
13 Orchard Street, Brookvale 3,300m2
victoria
Salisbury St Offices Richmond 3,500m2
PBR East Offices Bentleigh 3,200m2
Smollet St Offices Albury 3,100m2
PLC College Burwood 2,800m2
South Rd Warehouses Braybrook 2,000m2
South Australia
London Rd Warehouses Mile End 2,200m2
Port Rd Offices Hindmarsh 1,500m2
Ifould St Offices Adelaide 1,500m2
Goodwood Rd Offices Wayville 1,000m2
ACT
Network Developments Collie St Fyshwick ACT (Government Lease) 5,000m2
Solve Projects Collie St Fyshwick ACT (Self Storage) 3,200m2
Konstantinou Group Cnr Flemington & Standford St Mitchell ACT (Commercial) 3,000m2
Multiplex Greenway Tuggeranong (Centrelink) 45,000m2
Rutherford Head Office
6 Kyle St
Rutherford NSW 2320
T • 02 4015 2222
F • 02 4932 8050
Sydney Office
Level 4, 3 Carlingford Rd
Epping NSW 2121
T • 02 9201 7000
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28 Bayldon Rd
Queanbeyan NSW 2620
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Melbourne VIC 3000
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