Method of producing lined concrete pipe

Claim 1

A METHOD OF PRODUCING PROTECTIVELY LINED CONCRETE PIPE SECTION COMPRISING THE STEPS OF: PLACING INNER REINFORCEMENT ABOUT A SHANK PORTION OF A FORM HAVING A BASE PORTION; COATING THE BASE PORTION AND SHANK PORTION OF THE FORM WITH A PLASTIC RESINOUS MATERIAL WHICH IS SETTABLE AND BONDS WITH CONCRETE FOR EMBEDDING THE INNER REINFORCEMENT THEREIN TO FORM AN INNER LINING WHICH IS NON-POROUS; PLACING REINFORCEMENT IN ENCIRCLING RELATION TO THE BASE PORTION AND SHANK PORTION OF THE FORM RADIALLY SPACED FROM THE INNER LINING LEAVING EXPOSED A SECTION THEREOF; CASTING CONCRETE ABOUT SAID ENCIRCLING REINFORCEMENT WHILE THE MATERIAL OF SAID INNER LINING IS TACKY FOR BONDING THERETO; APPLYING SAID RESINOUS MATERIAL ABOUT SAID EXPOSED SECTION OF INNER LINING TO FORM A SEALING PORTION THEREWITH; PLACING OUTER REINFORCEMENT ABOUT SAID CAST CONCRETE; COATING EXPOSED SURFACES OF SAID CAST CONCRETE WITH SAID RESINOUS MATERIAL BEFORE COMPLETE SETTING OF THE CONCRETE TO FORM AN OUTER LINING BONDED THERETO AND EMBEDDING SAID OUTER REINFORCEMENT, AND WITHDRAWING SAID FORM AFTER SETTING OF THE PLASTIC TO EXPOSE A NON-POROUS SURFACE OF THE LINING.

Claim 2

A METHOD OF PRODUCING PROTECTIVELY LINED CONCRETE PIPE SECTION COMPRISING THE STEPS OF: PLACING INNER REINFORCEMENT ABOUT A SHANK PORTION OF A FORM HAVING A BASE PORTION; COATING THE BASE PORTION AND SHANK PORTION OF THE FORM WITH A PLASTIC RESINOUS MATERIAL WHICH IS SETTABLE AND BONDS WITH CONCRETE FOR EMBEDDING THE INNER REINFORCEMENT THEREIN TO FORM AN INNER LINING WHICH IS NON-POROUS; PLACING REINFORCEMENT IN ENCIRCLING RELATION TO THE BASE PORTION AND SHANK PORTION OF THE FORM RADIALLY SPACED FROM THE INNER LINING LEAVING EXPOSED A SECTION THEREOF; CASTING CONCRETE ABOUT SAID ENCIRCLING REINFORCEMENT WHILE THE MATERIAL OF SAID INNER LINING IS TACKY FOR BONDING THERETO; APPLYING SAID RESINOUS MATERIAL ABOUT SAID EXPOSED SECTION OF INNER LINING TO FORM A SEALING PORTION THEREWITH; PLACING OUTER REINFORCEMENT ABOUT SAID CAST CONCRETE; COATING EXPOSED SURFACES OF SAID CAST CONCRETE WITH SAID RESINOUS MATERIAL BEFORE COMPLETE SETTING OF THE CONCRETE TO FORM AN OUTER LINING BONDED THERETO AND EMBEDDING SAID OUTER REINFORCEMENT, AND WITHDRAWING SAID FORM AFTER SETTING OF THE PLASTIC TO EXPOSE A NON-POROUS SURFACE OF THE LINING.