Manufacture of pre-stressed concrete railroad ties
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United States of America Patent
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Sep 27, 1988
Issued Date -
N/A
app pub date -
Oct 21, 1987
filing date -
Nov 14, 1986
priority date (Note) -
Expired
status (Latency Note)
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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
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