Characteristics of the precast armour units moulds

Armour Units

Historically, simple rocks or crude blocks of concrete were used on the edge of the coasts, mainly in order to hold back the wave forces and dissipate their energy. But these blocks tended to be taken away or to break by the oceans power because their form was not adapted.

It is in 1950 that the first type of armour unit appeard, called Tretrapod. Designed and worked out by the Laboratoire Dauphinois d'Hydraulique (now Sogreah), based in Grenoble in France, this block was largely used everywhere in the world. Tetrapod had been the precursor of many other products such as Xbloc®, ACCROPODE™, A-Jacks®, Xbase®, ECOPODE™ or CORE-LOC™. All these armour units intervene in the protection of coastal infrastuctures.

These blocks, developed by companies like Concrete Layer Innovation (CLI) or Delta Marine Consultant (DMC) were designed in order to ensure:
  • The protection of the sea fronts prone to strong waves
  • To reduce the maximum wave energy
Moulds for armour units need quite sophisticated demoulding and handling devices due to their form and also to their weight.
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