Apparatus and method for manufacturing prestressed concrete railway ties
AssigneeCanfarge LTD (Francon Division)
InventorCipriano Da Re
Life of this patent
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Abstract
A continuous piece of concrete is first cast in an elongated casting mould mounted on a prestressing bench; after transfer of the prestressing force to the hardened concrete, the continuous piece of concrete is cut into a series of sections, each containing a certain number of railway ties. These sections are then removed from the casting mould, placed on a roller conveyor and then brought to a second cutting station where they are cut to form individual units. The invention also concerns a novel construction of a casting mould for the specific manufacture of such tie.
Claims7
A method of manufacturing multiple prestressed concrete railway ties with a longitudinal casting mold which is formed of a series of interconnected, individually movable mold sections, comprising the steps of:
- (a) exerting a pull at opposite ends of the casting mold to provide a gap to a predetermined extent between each of said interconnected movable mold sections,
- (b) securing in a series of openings appropriately located in the bottom wall of said longitudinal casting mold, a corresponding number of rail anchor devices,
- (c) placing longitudinally in said mold a series of prestressing wires,
- (d) anchoring said wires at opposite ends of said mold and exerting on said wires a predetermined prestressing force,
- (e) pouring concrete in said mold around said anchor devices and said wires to form a continuous piece of prestressed concrete,
- (f) curing said piece of concrete,
- (g) transferring said prestressing force to said piece of concrete whereby movement of the mold sections tending to close said gap is permitted,
- (h) effecting a first cutting of said piece of concrete to form a plurality of sections, each section having a given number of individual railway ties,
- (i) removing said sections from said mold and depositing said sections on conveyor means, and
- (j) effecting a second cutting in said sections to provide a plurality of individual railway ties.
Dependencies are inferred from the claim text.