E - Fixed Constructions – 04 – G
Patent
E - Fixed Constructions
04
G
E04G 13/02 (2006.01) B28B 7/22 (2006.01) B28B 7/34 (2006.01) B28B 7/36 (2006.01)
Patent
CA 2326014
A concrete column forming tube is provided for receiving poured concrete therein to produce a concrete column and which eliminates spiral seam lines and other undesirable characteristics on the outside surface of the formed concrete column and provides a construction which may be easily removed from the concrete column. The forming tube includes a spirally-wound cylindrical paper tube including multiple plies of paper adhered together, a centrifugally-cast plastic coating sprayed on an inside wall surface of the spirally-wound paper tube for producing an inside coated surface having a thickness and smoothness sufficient to eliminate spiral seam lines and other undesirable characteristics, and a tear strip positioned between the inside surface of the cylindrical paper tube and the plastic coating before centrifugal-casting and extending longitudinally of the forming tube over the entire length thereof and having a predetermined width and readily detachable from the plastic coating. In producing a concrete column, the forming tube may be removed from the produced concrete column by pulling the tear strip from one-end of the forming tube to the other to tear open and remove a section of the cylindrical paper tube and produce a longitudinally-extending gap of a width equal to the predetermined width of the tear strip to receive therein a device for cutting through the plastic coating.
Sim & Mcburney
Sonoco Development Inc.
LandOfFree
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