Metal working – Method of mechanical manufacture – Obtaining plural product pieces from unitary workpiece
Patent
1990-01-11
1990-09-04
Silbaugh, Jan H.
Metal working
Method of mechanical manufacture
Obtaining plural product pieces from unitary workpiece
29452, 249 11, 249119, 249155, 264157, 264228, 264229, 264261, 2642979, 404 2, 405124, B23P 1700, B28B 702, B28B 724, B28B 1114
Patent
active
049532804
ABSTRACT:
A method of manufacturing a three-sided culvert includes prestressing tendons in the culvert form. A series of prestressing tendons are secured within a form adapted for casting a concrete culvert having three orthogonal sides. The prestressing tendons are utilized in the top slab of the three-sided culvert and are positioned within the form prior to the pouring of concrete therein. Reinforcing steel can be eliminated along with the costs associated therewith and a culvert configuration can be provided with enhanced strength and improved material properties. Such culverts may thus be provided in modular form for placement upon foundations at remote locations for the creation of bridges, drainage areas and the like.
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Humes "Large Box Culverts . . . ".
Humes "Box Culverts", pp. 1-15.
Gifford-Hill & Company, Inc.
Kutach Karen D.
Silbaugh Jan H.
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