Is the Core-loc the "best" unit for all applications?
The Core-loc presently represents an efficient use of concrete for breakwater armour units. This is due to an optimised packing density and in this sense it is the best unit. Some applications might require very large units (like cubes in excess of 100 t required at Sines, Portugal) or be prone to unsuitable or inappropriate construction conditions which would present practical limitations to the application of Core-loc. If you are unsure about the practicality of Core-loc for a specific application contact us with the project details for an assessment.
Yes. While the concepts behind rubble mound breakwaters have essentially stayed the same over many years, advances in positioning and measurement instrumentation now enables much more effective control of placement and the recording of placed positions. It should also be borne in mind that fewer units need to be placed in a single layer compared to a double layer. More time can therefore be spent on ensuring the correct position of Core-locs without increasing the total construction time.
How many breakwaters have been built with Core Loc units?
Approximately 19 breakwaters worldwide.
No. If the same volume of concrete is used for a single layer than that proposed for a double layer, the single layer would be typically much more stable than the units in the double layer.
Approximately 10 percent of the armour placement cost. If you want to compare the cost of Core-locs with other units, increase the volume of concrete by 10 percent to obtain an estimate of Core-loc costs that include the royalty.
The established practical technical specifications provide the necessary backup for quality assurance. Experience with application of the Core-loc is shared between Core-loc projects and provides constant input into practical solutions to some of the challenges facing the application of single armour layer construction. The value of "having been there" goes a long way to ensure that quality can be achieved in a practical way.
A number of projects are listed at www.core-loc.com
The patent is held by the U.S. Army Corps of Engineers. Core-loc Africa holds the license for territories in Africa which means that CLA is the only point of contact with regard to the application in these territories. However, practical experience and research is shared with other license holders and the Corps of Engineers.
What are the steps to be taken should I wish to use Core Loc?
Contact CLA with the following information:
CLA will assist you with a preliminary unit sizing which can be used for costing purposes. If a decision is made to go ahead with a Core-loc structure a detailed design by a competent professional designer will be required. Scale hydraulic models are recommended as part of the detailed design.
can I obtain Core Loc model units?
A range of model units are retained by the Core-loc Licensor and Licensees of the various territories. Available units can generally be rented at a cost of US$ 1.4/kg/week (excluding shipping and handling costs). New units can also be manufactured to exact standards within a relatively short time. Further information both for renting and manufacturing units can be provided on request.
What are typical construction costs?
is difficult to give a general indication of costs. The
size of the project, location and purpose can affect unit costs significantly. For
new breakwaters, the cost of quarry rock is likely to be more than the cost of
concrete armour units. Typical
construction costs based on previous projects can be provided where possible for
support is provided by Core-loc North America?
The following support is included as part of a standard license agreement:
What requirements apply to specifying Core-locs in a tender document?
needs to approve the preliminary and final design to ensure the appropriate
application of the unit. The tender document should also make reference to the
standard License Agreement setting out the basis for using the unit. It
will be required that the owner or contractor responsible for the project
constructioin enters into the sub-license agreement under which the units will
be permitted to be manufactured. The
contract needs to make allowance for this. A copy of the sub-license agreement
is available on request.
should I contact?
Anton Holtzhausen ( firstname.lastname@example.org)
Allan Wijnberg (email@example.com)