Paperboard formwork and method for forming concrete structures
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United States of America Patent
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Issued Date -
Jan 26, 2006
app pub date -
Jul 22, 2004
filing date -
Jul 22, 2004
priority date (Note) -
Abandoned
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Abstract
A formwork for forming a concrete structure, comprising a rigid tubular envelope defining a peripheral inner wall circumscribing an axial hollow, further comprising a wall assembly nested within the axial hollow of the tubular envelope and including a number of wall parts defining inside and back surfaces. The back surface of each wall part bears against a corresponding section of the envelope inner wall, and the wall parts are arranged successively one relative to the other in peripheral coextensive fashion within the tubular envelope such that the inside surfaces, in combination, configure an axial forming cavity for receiving and forming a concrete column therein. The wall assembly further comprises an impervious liner applied to the inside surface of each wall part, providing an impervious barrier between the forming cavity and the inside surface of the wall parts.
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