Concrete railroad crosstie casting and handling system

Details Concrete railroad crosstie casting and handling system Concrete railroad crosstie casting and handling system

B - Operations, Transporting

28

B

25/47

B28B 1/26 (2006.01) B28B 13/02 (2006.01) B28B 15/00 (2006.01) B28B 23/06 (2006.01) E01B 3/32 (2006.01)

Patent

CA 1169635

ABSTRACT Concrete railroad crossties are mass-produced by slip- forming concrete using a specially adapted continuous casting machine (70, 230) to deposit concrete over a plurality of forms (34, 210) arranged side by side end end to end above an elongated casting bed (32, 209). Each group of side-by-side casting forms is preferably supported above the bed on a carriage (214) longitudinally moveable on rollers (220), thereby permitting relative movement of adjacent end-to-end carriages to compensate for concrete contraction when pretensioned wire strands in the concrete are detensioned and for a slight recoil action when adjacent end-to-end crossties are separated by sawing. An apparatus (140, 270) for lifting side-by-side crossties in groups is also disclosed. The apparatus (270) preferably is equipped with hydraulic jacks (282) for forcibly ejecting the concrete crossties from their forms.

332606

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