| Rocla is the Australian licensee for the manufacture and marketing of A-Jacks high stability concrete armour units. |
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| A-Jacks are precast concrete armour units designed to: |
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protect waterfront structures subject to severe wave action and high flows |
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provide high stability using single layer construction in order to reduce construction costs |
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interlock into a flexible, highly permeable matrix |
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maximize dissipation of wave energy |
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have a patented two-piece construction allowing A-Jacks to be easily transported flat on
pallets from a remote point of manufacture for assembly and installation on site |
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use a simple steel mould construction that allows fast flat-bed casting and de-moulding (
steel mould typically approx $6K ea ) |
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| Concrete armour units are used for coastal applications typically in areas with rough wave climates or where insufficient quality and/ or size of available quarry stone is available. |
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| 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 has determined and can vary from a minimum of 25 for single units up to 100+ for nested units. |
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| A detailed Coastal Engineering Report on A-Jacks including tank-testing results is available for download. |
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| Product Features & Benefits |
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Flume-tested at Oregon State Uni – proven high stability units with stability coefficient Kd range 25 -100 |
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Units interlock with each other to form a flexible, highly permeable matrix |
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A nested structure has a 60% VOID space providing maximum energy dissapation |
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Available in mass range 36kg up to 20T |
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Manufactured in a two piece unit to facilitate easy transport to site |
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