Short radius culvert sections
US5375943A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1993 |
| Grant date | Dec 27, 1994 |
| Priority date | — |
| Expiry date | Oct 15, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04C2/326
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Soil/metal supporting structures commonly include panel sections having a short radius of curvature in the range of 750 mm to 2,500 mm. In such soil metal supporting structures the panels are of heavy gauge in the range of 2 mm to 10 mm thickness. Usually, expensive tooling and forming techniques are required to cold form the heavy gauge material into a curved shaped having such short radius. Such expensive techniques have been eliminated by this invention by virtue of the improvements comprising: PA0 a) the panels have a high degree of ductility before being cold formed, such high degree of ductility being determined by a ratio of specified minimum yield strength to specified minimum tensile strength equal to or less than 0.8; PA0 b) the panels are cold formed with cross-corrugations in each of the inside ridges of the longitudinally formed corrugations of the panel, the cross-corrugations are sinusoidal and cross section and allow the cold forming of a short radius panel on a consistent basis without distorting panel shape to facilitate thereby interconnection of the panels for the structure; PA0 c) the cross-corrugations have a depth in the range of 4 mm to 12 mm and a pitch of …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.