Background:
The Canberra Olympic Swimming Pool
development was an ACT Government funded initiative to remove, replace
and recycle the existing 22-year-old air-supported membrane enclosure in
order to upgrade the look, feel, and functionality of the facility.
Scope of Work:
The
replacement structure was required to be a clear-span design with
curved roofing in the shape of a dome. PVC tensile fabric with a blue
and white colour scheme was specified to match the existing structure
design.
Key design criteria included:
- Improve functionality and visual appearance compared to existing structure
- Easy to clean, maintain, and repair, with the ability to replace side panels if necessary
- Provide a comfortable, light and airy internal atmosphere without excessive heat or humidity, through all seasons of the year
- Ability to open the sides in summer for weather control
- Incorporate a hanging framework for flags, ropes and other equipment
- Incorporate a mechanical ventilation system and a suspended internal ceiling liner within the roof space to aid internal environmental control
- Capable of supporting heavy duty roof fans, artificial lighting, and electrical cabling
- Structural steel framing to have corrosion protection suitable for an indoor chlorinated pool
- Existing air-supported membrane to be removed and recycled in accordance with the ACT "No Waste" strategy
The Solution:
The
standard Supa-Span-C design was customised to incorporate key project
requirements. The steel truss framing was engineered to integrate the
required electrical and fire detection systems, and manufactured with a
special three-coat high build paint, to avoid erosion. Ferrari 702s
membrane was chosen to clad the structure with the 502s range selected
for an internal liner.
With the use of translucent membranes
allowing natural transmission of sunlight, the requirement for daytime
lighting has been significantly reduced. To support and regulate climate
control, a mechanical ventilation system operates between the external
membrane and interior liner creating an insulation air gap, and mesh
vents along the sides of the structure provide the required air and
moisture release. A retractable curtain walling system has also been
implemented to allow cross ventilation during warmer weather.
In
an Australian first, the existing air supported structure was dismantled
and recycled using the Texyloop process. Developed by the Ferrari and
Solvay™ Groups, Texyloop involves the closed loop method of recycling
polyester-PVC composite textiles. Until the arrival of Texyloop, these
composites were not fully recyclable due to the difficulty in separating
the PVC from polyester fibres. Now these textiles can be separated,
minimising the impact of raw material consumption and landfill or
pollution through incineration.
Installation of the structure was
very difficult due to the limited site access and construction over the
existing in-ground swimming pool. Steel assembly was completed in the
adjoining car park with the completed arches crane lifted onto the site.
The fabric was also crane lifted from the car park to the top of the
completed frame and then spread out over the steel frame, fixed, and
then tensioned. The installation was completed in approximately four
weeks. The existing entrance canopy was also refurbished with new fabric
and better blind systems, and mechanical glass sliding doors were added
to provide entry into the pool.
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