Rocla is the Australian licensee for the manufacture and marketing of A-Jacks® high stability concrete armour units.
A-Jacks® are precast concrete armour units designed to:
Concrete armour units are used for coastal applications typically in areas with rough wave climates or where insufficient quality and/or size of quarry stone is available.
A-Jacks® can be manufactured in various size armour units and are installed either in a uniform (nested) or random pattern. A-Jacks® has been rigorously tested at Oregon Uni / Manly Hydraulics Laboratory in terms of performance and stability – stability coefficient Kd can vary from a minimum of 25 for single units up to 100+ for nested units.
A detailed Coastal Engineering Report on A-Jacks® including tank-testing results is available for download.