The Playford Bowling Green Canopy design needed to provide a column and obstruction free playing surface, necessitating a large span structure. Structural layouts were optimised based on the best value solution considering installation methodology, fabric design, steel tonnage and foundation size. Parametric design tools were used to run and check multiple structural models and configurations to enable speedy assessment of different options that could be presented to the client for review.
The MakMax Hawksbill Bowling Green Canopy is a sawtooth-style structure, created with inclined parallel arches, braced to each other, utilizing valley cables between the arch pairs to provide the fabric with shape and stability. The arches are supported by perimeter columns; the largest loaded area at the arch-column connections had to be carefully stiffened to ensure adequate load transfer while also anchoring the valley cables.
The structure required significant co-ordination with other contractors (builder, greens installer) working on site over the 12-week program. Both steel and fabric deliveries were coordinated using a just-in-time methodology so that items arrived on site as the install crews were ready for them, in the order they were required. This minimised double handling on site and the requirement for excessive laydown and storage areas. The bulk of the installation occurred in late January and early February when temperatures in Adelaide were extreme – greater than 45 degrees on several days; which necessitated careful planning for fatigue and heat management so that works could be completed safely without compromising productivity.
The size of the structure meant that installation also involved working with larger fabric panels than is usual for a bowls green cover.
The 5575 square metre PVC (Mehler FR900N) Playford Bowling Green Canopy covers a total of 21 rinks (120m length), lit with state-of-the-art LED sports lighting, allowing year-round utilization of the bowling greens, irrespective of the weather conditions.
Mehler FR900N PVC was chosen for Playford due to its excellent top coating, providing longevity of the fabric structure, while still being an economical alternative to other fabrics. PVC coated polyester membrane was the sensible choice, providing a medium design life with excellent self-cleaning properties and a high tensile strength.
All fabrics seams were RF welded, thereby creating ‘structural fabric joints’ to create the large fabric necessary. Closures for the field joints were attached in the factory to reduce the amount of onsite work required and to provide a greater degree of confidence in the weatherproofing of the details.
The choice of material meant that weldability of the PVC material was particularly straightforward. Patterning was undertaken to maximise fabric usage and to minimize weld lengths per area; this project was extremely efficient from a fabric usage perspective and the majority of ‘wasted’ material was used for doublers and flashings on the project.
The Playford Bowling Green Canopy project was part of a total refurbishment, including a new clubhouse and synthetic greens. The Playford Bowling Club is the fourth largest in SA and the refurbishment has given the club an exciting future.