Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1995-08-03
1997-04-08
Aftergut, Karen
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
249 86, 264 70, 264 71, 264148, 264151, 264157, 264163, 264167, 26417711, 26421111, 264228, 264229, 2642979, 425 63, 425 64, 425111, B28B 108, B28B 714
Patent
active
056184760
ABSTRACT:
Pre-stressed concrete railroad ties are manufactured by the slip form process in the absence of mold members, other than the slip form itself. Tie casting occurs on portable casting soffits between portable soffit anchored deadmen supporting the pre-stressed tie tensile members immediately overlying the casting soffit. Tie formation occurs with the slip form passing around and over the pre-stressed tension members. Track fastening hardware is vibrationally inserted through windows of the slip form to place the track fastening hardware to precise measured dimension along the route of slip form movement and to configure that portion of the tie adjacent the track fastening hardware. End of tie locations as well as tie batch identification are likewise marked during the slip form process. Upon cure, the ties are cut at their marked end location. Provision is made to place the track fastening hardware into high strength modular inserts which are later being modularly inserted to the tie during the slip form process.
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