Semi-Ribbed Spiral Voids, Corrugated Sleeves
(for slab girders and bridge decks)

Semi-Ribbed Spiral Pipe
This duct offers reinforcing corrugation for added strength. It is made with an air-tight spiral four-ply lock seam and is lightweight and economical. Semi-ribbed spiral duct is used primarily for extra strength in underground applications.

Semi-ribbed spiral pipe is available in galvanized steel, cold roll steel, stainless steel and aluminum in thickness from 18 ga. to 26 ga. It is available in sizes from 6" to 72".


  • Internal corrugation for bonding strand and rebar
  • External corrugation to add bonding to concrete
  • Air-tight four-ply lock seam
  • Available in long lengths
  • Extra strong and rigid




Corrugated Dowel Grout Tubes
(for piles)

Semi-Ribbed Spiral Voids
(for slab girders and bridge decks)