Quasi-cylindrical cargo container and construction
A quasi-cylindrical cargo container is formed of a plurality of rigid, curved panels together forming first and second semi-cylindrical shells, and a plurality of rigid, flat extension panels bridging the first and second semi-cylindrical shells. A method of manufacturing the container includes forming the first and second semi-cylindrical shell from the curved panels, forming the quasi-cylindrical shell from the first and second semi-cylindrical shells and the flat extension panels, forming collars conformably encompassing the quasi-cylindrical shell, constricting the collars to compress joints formed at abutting edges of pairs of adjacent panels, rolling the shell and collars sequentially to bring the joints to a lower position, welding inside seams of the joints when at the lower position, removing the collars, rolling the shell sequentially to bring the joints to an upper position, and welding outside seams of the joints when at the upper position.
1. A quasi-cylindrical cargo container comprising:
a plurality of curved panels having a common curved shape characterized by a curvature;
a first semi-cylindrical shell formed from a first set of the curved panels joined at respective abutting edges of adjacent pairs of the first set of curved panels;
a second semi-cylindrical shell formed from a second set of the curved panels joined at respective abutting edges of adjacent pairs of the second set of curved panels; and
a plurality of flat extension panels bridging respective opposing longitudinal edges of the first semi-cylindrical shell and the second semi-cylindrical shell,
wherein the first semi-cylindrical shell, the second semi-cylindrical shell, and the plurality of flat extension panels together form a quasi-cylindrical tube having an unobstructed hollow interior, and
wherein adjacent panels are joined at the respective abutting edges using welds.
2. The quasi-cylindrical cargo container according to claim 1 , wherein the curved panels are extruded curved panels, and for at least one of the extruded curved panels an extrusion axis of the extruded curved panel is parallel to a longitudinal axis of the quasi-cylindrical tube, and a cross-sectional profile of the extruded curved panel perpendicular to the extrusion axis has the curved shape.
3. The quasi-cylindrical cargo container according to claim 1 , wherein the curved shape of each of the curved panels has a common arc length.
4. The quasi-cylindrical cargo container according to claim 1 , wherein each one of the panels has a common longitudinal length.
5. The quasi-cylindrical cargo container according to claim 1 , wherein each of two of the curved panels comprises a projection configured for coupling to a support, the projection comprising a rail integral with and extending along at least a part of a length of the curved panel and configured for mounting to the support, wherein the two curved panels are relatively positioned to form the quasi-cylindrical tube such that the corresponding rails are symmetrically positioned relative to a transverse center of the container.
6. The quasi-cylindrical cargo container according to claim 1 , wherein the adjacent pairs of the panels are joined at the respective abutting edges in a tongue-and-groove joint, wherein a tongue provided at the abutting edge of one of the panels is mated in a groove provided at the abutting edge of the other one of the panels.
7. The quasi-cylindrical cargo container according to claim 1 , wherein the panels are formed of aluminum.
8. The quasi-cylindrical cargo container according to claim 1 , wherein each panel comprises an inner skin and an outer skin sandwiching a plurality of webs bridging a space between the inner skin and the outer skin.
9. The quasi-cylindrical cargo container according to claim 8 , wherein the outer skin has a thickness of from 2 mm to 3 mm, the inner skin has a thickness of from 3 mm to 4 mm, the webs each have a thickness of from 2 mm to 3 mm, the outer skin and the inner skin are spaced by a gap of from 35 mm to 40 mm, and the webs are spaced by a gap of from 20 mm to 30 mm.
10. The quasi-cylindrical cargo container according to claim 8 , wherein for at least one of the panels, the outer skin, the inner skin, and the webs form a channel.
11. The quasi-cylindrical cargo container according to claim 1 having a front wall and a rear opening for passage of the cargo, and a tailgate hingedly mounted at or adjacent a perimeter of the rear opening closeable to retain the cargo in the container and openable to permit passage of the cargo through the rear opening.
12. The quasi-cylindrical cargo container according to claim 1 substantially free from reinforcing annular bands or ribs.
13. The quasi-cylindrical cargo container according to claim 1 , wherein an inside surface of the cylindrical cargo container is free from projections.
14. The quasi-cylindrical cargo container according to claim 1 , wherein a transverse cross-section of the quasi-cylindrical tube has a shape substantially of a ‘U’ superimposed with an inverted ‘U’.
15. The quasi-cylindrical cargo container according to claim 1 , comprising a first extension panel bridging a first pair of opposing longitudinal edges of the first semi-cylindrical shell and the second semi-cylindrical shell, and a second extension panel bridging a second pair of opposing longitudinal edges of the first semi-cylindrical shell and the second semi-cylindrical shell.
16. The quasi-cylindrical cargo container according to claim 15 , wherein the first extension panel and the second extension panel have a common width.
17. The quasi-cylindrical cargo container according to claim 1 , comprising a first plurality of extension panels bridging a first pair of opposing longitudinal edges of the first semi-cylindrical shell and the second semi-cylindrical shell, and a second plurality of extension panels bridging a second pair of opposing longitudinal edges of the first semi-cylindrical shell and the second semi-cylindrical shell.
18. The quasi-cylindrical cargo container according to claim 17 , wherein the first plurality of extension panels together, and the second plurality of extension panels together, have a common width.
19. The quasi-cylindrical cargo container according to claim 4 , wherein the common longitudinal length is substantially an entire length of the quasi-cylindrical cargo container.
20. The quasi-cylindrical cargo container according to claim 1 , wherein each of the first semi-cylindrical shell and the second semi-cylindrical shell has a semi-circular transverse cross-section perpendicular to a longitudinal axis of the container.
21. The quasi-cylindrical cargo container according to claim 1 , wherein adjacent pairs of the panels are joined by single final welds and are free or substantially free of tack welds.
22. The quasi-cylindrical cargo container according to claim 1 , wherein the curved panels are extruded curved panels and for each one of the extruded curved panels an extrusion axis of the extruded curved panel is parallel to a longitudinal axis of the quasi-cylindrical tube, and a cross-sectional profile of the extruded curved panel perpendicular to the extrusion axis has the curved shape.
23. The quasi-cylindrical cargo container according to claim 2 ,
wherein the adjacent pairs of the panels are joined at the respective abutting edges in a tongue-and-groove joint, wherein a tongue provided at the abutting edge of one of the panels is mated in a groove provided at the abutting edge of the other one of the panels, and
wherein adjacent pairs of the panels are joined at respective abutting longitudinal edges.
24. The quasi-cylindrical cargo container according to claim 23 , wherein for at least one of the extruded panels a longitudinal length of the panel is at least 10 times an arc length of the curved shape of the panel.
25. The quasi-cylindrical cargo container according to claim 24 , wherein each of the plurality of flat extension panels is an extruded flat extension panel having an extrusion axis of the extruded flat extension panel parallel to the longitudinal axis of the quasi-cylindrical tube.
26. A trailer or truck comprising the quasi-cylindrical cargo container according to claim 1 mounted to a chassis supported by a wheeled suspension.
27. A railcar comprising the quasi-cylindrical cargo container according to claim 1 mounted to a chassis supported by a wheeled suspension.