Concrete column forming tube having a smooth inside coated surface
US5874016A · kind A · utility
6Cited by
17References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 4, 1993 |
| Grant date | Feb 23, 1999 |
| Priority date | — |
| Expiry date | Oct 4, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04G13/021
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A concrete column forming tube and method of making same for receiving poured concrete column therein to produce a concrete column is characterized by a smooth inside coated surface in the forming tube to eliminate spiral seam lines and other undesirable characteristics on the outside surface of the formed concrete column. The tube is formed from spirally-wound plies of paper adhered together and has a centrifugally-cast epoxy resin coating sprayed onto the inside surface of the spirally-wound tube while the tube is rotating to produce a smooth inside coated surface on the forming tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.