Title

Initial Scope:

Nilsen (NSW) Ltd. engaged SOTO Consulting Group to certify that the proprietary helipad windsock pole intended for install atop the main tower of the redeveloped Lismore Base Hospital would be fit for purpose and complying with the relevant Australian Standards, Civil Aviation Authority Safety Regulations and International Civil Aviation Organisation. Due to the height and location of the windsock pole (9m high and 80m above ground level) Nilsen requested the pole be certified for gale force.

Solution:

Initial Advanced Analysis by SOTO using SPACEGASS structural analysis software determined that high wind speeds of the location would be beyond the structural capabilities of the intended proprietary windsock and base plate.

SOTO progressed with a significantly improved, ground-up redesign of the windsock pole employing expertise in 3D modelling, detail drawings, and structural engineering & design. The SOTO team would not only tackle the requirements to handle high wind speeds, but also wanted to allow for improved maintenance accessibility of the lighting at the top of the pole while complying with all relevant standards.

The resulting SOTO-designed windsock pole incorporated a hinged mechanism midway, which was balanced and counterweighted so the top section can be lowered and accessed at ground level for easy and safe maintenance.

Results:

SOTO’s windsock pole design solution met the requirements for structural integrity in gale force winds, while also significantly improving accessibility and safety for maintenance workers by removing the need for ladders or Elevated Work Platforms (EWP). The design met and exceeded the client’s needs as well as complying with relevant design standards for concrete, steel and aerodrome structures.

Design standards include:

  • AS 1170.0:2002 – Structural Design Actions Part 0
  • AS 1170.1:2002 – Structural Design Actions Part 1
  • AS 1170.2:2011 – Structural Design Actions Part 2
  • AS 3600:2009 – Concrete Structures
  • AS 4100:1998 – Steel structures
  • CASR Part 139 –  Aerodromes
  • ICAO Annexure 14 Volume 1 –Aerodromes
  • ICAO Annexure 14 Volume 2 – Aerodromes – Heliports

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SOTO’s windsock pole design solution met the requirements for structural integrity in gale force winds, while also significantly improving accessibility and safety for maintenance workers