DD-DS internal spacers are designed to allow the anchor in the foundation to guarantee the sinusoid effect of the strands inside the corrugated sheaths, as well as the separation of the strands and tubes necessary for the grouting and vent activity. Internal spacers are only installed in the foundation.

Spacers are mounted manually according to the anchor assembly specifications, and in any case with a max. pitch of 1.5 m. They are fixed with metal or tape straps to allow a correct flow of the grouting flow with no obstructions.