Manufacture of pre-stressed concrete railroad ties

Details Manufacture of pre-stressed concrete railroad ties Manufacture of pre-stressed concrete railroad ties

1987-10-21

1988-09-27

Reeves, Robert B.

Plastic article or earthenware shaping or treating: apparatus

Shaping surface including means to release or remove product...

Removal-miscellaneous

425111, 294 8161, 294 871, E01B 334, B28B 1304

Patent

active

047738405

ABSTRACT:
Prestressed concrete railroad ties are formed in molds which are supported by existing track near the area where they are to be installed. Each mold will form a number of ties. Reinforcement strands are located within a plurality of longitudinally spaced molds. Concrete is then poured into the molds and the ties are formed bottoms up in the molds. A group of ties are simulatenously removed from a given mold by a special extractor which first simultaneously clamps the reinforcing strands extending outwardly from a given mold, and then lifts the strands as a group from the mold by a suitable crane. Preferably the center of gravity of ties is spaced from a pivot point which will cause 180.degree. rotation locating the ties in upright position to be loaded on a railway car or other vehicle to take them to the site where they are to be installed. BACKGROUND OF THE INVENTION

REFERENCES:
patent: 2609109 (1952-09-01), Ardell
patent: 3032851 (1962-05-01), Gibbs
patent: 3174791 (1965-03-01), Dardaine
patent: 3220760 (1965-11-01), Buchik et al.
patent: 3298541 (1967-01-01), Alexon
patent: 3608163 (1971-09-01), Harford
patent: 3666385 (1972-05-01), Baker
patent: 4149306 (1979-04-01), Tice

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