E - Fixed Constructions – 04 – G
Patent
E - Fixed Constructions
04
G
E04G 15/06 (2006.01) F16J 15/00 (2006.01)
Patent
CA 2072841
Barton 91026 METHOD AND APPARATUS FOR FORMING UNLINED PASSAGES THROUGH CONCRETE WALLS Abstract of the Disclosure A method of creating a sleeveless passage of controlled size and shape through a concrete wall poured in a form including two form plates mounted in fixed, spaced relation separated by a width W comprises first forming a plurality of modular passage units, each unit including an annular main shell of external size and shape conforming to a segment of the sleeveless passage; each unit has end closure walls closing the ends of the main shell. Each modular unit has an axial length L1; W>L1. A first modular unit is mounted on the inside of one form plate at the location selected for the passage through the wall, with one of its closure walls engaging the form plate. At least one additional modular unit is mounted on the first unit to form a modular unit stack having a total length equal to the width W, with at least one closure wall remaining in the center of the stack. The other form plate is mounted against an outer closure wall of the last modular unit in the stack. The invention further embraces plural forms of modular passage units utilized in the foregoing method.
Barton Bruce G. Jr.
Borden Ladner Gervais Llp
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