System for forming lined passages through concrete walls

Details System for forming lined passages through concrete walls System for forming lined passages through concrete walls

E - Fixed Constructions

04

G

E04G 15/00 (2006.01) F16L 5/00 (2006.01) F16L 9/153 (2006.01)

Patent

CA 2076415

Barton 91027 SYSTEM FOR FORMING LINED PASSAGES THROUGH CONCRETE WALLS Abstract of the Disclosure A system for producing a sleeve-lined passage of uniform diameter D through a concrete wall molded in a concrete wall form including first and second form plates mounted in fixed relation and spaced by a wall width W includes a multiplicity of modular spools, preferably made of sheet steel; each spool comprises an annular shell having an axial length L less than W and an inside diameter D with front and rear flat flanges extending outwardly of the front and rear rims of the shell. For a first group of spools the axial length L is of three inches; for the other spools length L of four inches.

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