| 摘要 |
A paperboard tube for use in forming concrete columns is split longitudinally into two parts, with each part initially having its cut edges threated with a urethane resin, with each part then being dipped into a solution of an acrylic resin, and finally each part then having its interior surfaces coated with a urethane resin, each part is then assembled into a composite tube, and when used, having a reinforcing member arranged along the length of its longitudinal slits, for reinforcement of the tube edges, and finally a strap(s) or clamp(s) is arranged therearound so as to secure the tube into position for use in the pouring of concrete columns.
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