Patent ID: 7621103

Claim:
A duct system for profiled post-tendon construction comprising: a first duct being of a first polymeric material; a second duct being of a second polymeric material, said second duct having a plurality of ribs formed thereon and extending outwardly therefrom, each of said plurality of ribs communicating with an interior passageway of said second duct, each of said plurality of ribs having an outwardly extending surface; a third duct being of a third polymeric material, said second polymeric material being more wear resistant than said first and third polymeric materials, said second duct having a curvature greater than a curvature of said first and third ducts; a first coupler affixed to one end of said second duct and to an end of said first duct so as to seal said first and second ducts in liquid-tight end-to-end relationship, said first coupler being in compressive liquid-tight relationship with at least one rib of said plurality of ribs adjacent said one end of said second duct; and a second coupler affixed to an opposite end of said second duct and to an end of said third duct so as to seal said second and third ducts in liquid-tight end-to-end relationship, said second coupler being in compressive liquid-tight relationship with at least one rib of said plurality of ribs adjacent said opposite end of said second duct, said first and second couplers having a length substantially less than a length of said second duct.