The Kalbarri National Park Skywalk is a complex structure, manufactured from high strength plate and steel components that have long lead and technical assembly and welding requirements.

The project is somewhat akin to building a main roads bridge structure with the added complexity associated with being completely cantilevered and taking into account architectural and public appeal requirements.

The steel material was selected for its self weathering “rust” look that blends with the local Western Australian landscape and reduces ongoing maintenance on the installed walkway whilst providing adequate corrosion protection.

The complex plate and steel components were nested and processed inhouse in our dedicated steel, plate and pipe processing bay prior to fit up fabrication works. The fabrication of the box sections themselves created numerous challenges for the fabrication team including working in confined and constricted spaces. The Alltype Engineering PAWS program was utilised continuously by the workshop team to reassess changed works conditions and risks on an ongoing basis for not only these considerations, but also for working at height and handling of non-uniform and heavy components that had to be moved regularly as part of the sequential construction methodology.

Special welding processes and procedures had to be developed, tested and then qualified to suit the nature of the structure being heavy steel and high strength materials. High levels of welding preheat and stringent welding parameter along with Post Weld Heat Treatment ensure the integrity of the finished walkway.

Being a key Western Australian Tourism investment having such public prominence also led to Alltype Engineering building a mock up walkway component of the structure to allow key stakeholders to preview the finished product prior to commencement of this stage of the project. This mock up provided a richer appreciation of the walkway compared to computer simulation and modelling and served to allow a gating process for project progression.

Living up to our name, Alltype Engineering is proud to be involved with such a unique and challenging project.