Pipe joint of synthetic plastic concrete

Claim 1

A CONCRETE PIPE OF COMPOSITE CONSTRUCTION COMPRISING A CONCRETE CORE HAVING AN OUTSIDE CYLINDRICAL SURFACE, AN END HAVING A TRANSVERSE END FACE, AN ANCHOR LUG IN THE OUTSIDE CYLINDRICAL SURFACE AT A LOCATION ADJACENT THE TRANSVERSE END FACE AND A LENGTH OF WIRE EXTENDING FROM THE ANCHOR LUG SPIRALLY UNDER PRESTRESS TENSION AROUND THE OUTSIDE CYLINDRICAL SURFACE, A FLANGE ON SAID END COMPRISING A THERMOSETTING SYNTHETIC PLASTIC AND AGGREGATE MIXTURE, SAID MIXTURE COMPRISING AN ADHESIVE SUBSTANCE WHICH IS FLUID DURING APPLICATION TO THE CORE AND WHICH AFTER HAVING SET REMAINS AS A SOLID SUBSTANTIALLY NONDEFORMABLE MATERIAL, SAID FLANGE HAVING TURNS OF SAID WIRE ADJACENT THE END, THE WIRE AND THE RESPECTIVE ANCHOR LUG BEING EMBEDDED IN SAID FLANGE.