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US 4,421,710 AGranted
Method, devices, mold bearing structures and installations for improving the efficiency of processes for the manufacture of prestressed concrete products
OwnerMircea Borcomaninventor
Life of this patent
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Abstract
Some self-supporting screens for closing the mold head, some self-supporting separating screens, group positioning devices and group tensioning devices, are used. A series of novel installations for the shock heat treatment, stripping and removal of the products enables by combination with the foregoing means, improvement with respect to known processes, on the one hand of the manufacturing process and on the other hand enables stripping to be brought forward.
Claims22
A method of manufacturing concrete products prestressed by bonded reinforcements, comprising the steps of:
- using movable and self-supporting screens for closing molds at both ends and anchoring reinforcements such as wires and strands;
- after tensioning the reinforcements, and molding concrete in molds, and after hardening of concrete, particularly by passing filled molds through a heat treatment installation, stripping the products with transfer of the prestressing forces to the end screens;
- then, passing the stripped products through a cooling installation;
- and, after the passage of said products through the cooling installation, the concrete having acquired additional strength with respect to that which it had on stripping, effecting the transfer of the prestressing forces to the concrete by bonding, and then recovering the self-supporting screens.
1 more element
Dependencies are inferred from the claim text.