Methods and apparatus for the manufacturing of prestressed reinforced concrete railroad ties and the like

Abstract

Methods and apparatus for the manufacturing of prestressed reinforced concrete railroad ties and the like in which the apparatus consists of an elongated spine or compression member which has no foundation but rather is independent of the supporting surface upon which it rests. In one version of the apparatus two bridge members confront the opposite ends of the spine and permanent tension resisting members pass beneath the spine from end to end of the spine and are attached to the lower ends of the bridge members. In another version two structural members are embedded in the concrete of the spine and protrude to provide terminal members.

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       19 . A method for varying the spacing between reinforcing wires in array comprising the steps of bending at least some of the reinforcing wires in one direction around a first transverse member and oppositely bending the same reinforcing wires around a second transverse member at a location longitudinally spaced from the first transverse member.  
   
   
       20 . A method of manufacturing prestressed reinforced concrete railroad ties comprising the acts of: 
 placing a freestanding elongated spine upon but unconnected to a supporting surface;    locating terminals at ends of and above said spine in connected relation to the spine;    attaching reinforcing wire anchors to said terminals;    placing at least one railroad tie mold upon said spine so as to be superimposed upon the spine between the terminals;    passing reinforcing wires through said mold;    attaching said reinforcing wires to said anchors;    tensioning each reinforcing wire as desired;    pouring concrete into the mold around the tensioned wires.    
   
   
       21 . A method of manufacturing prestressed reinforced concrete railroad ties comprising the acts of: 
 placing a freestanding elongated spine upon but unconnected to a supporting surface;    locating terminals at ends of and above said spine in connected relation to the spine;    attaching reinforcing wire anchors to said terminals;    placing at least one railroad tie mold upon said spine so as to be superimposed upon the spine between the terminals;    passing reinforcing wires through said mold;    attaching said reinforcing wires to said anchors;    tensioning each reinforcing wire as desired;    pouring concrete into the mold around the tensioned wires;    the spine comprising an elongated monolithic block of concrete.    
   
   
       22 . A method of manufacturing prestressed reinforced railroad ties comprising the acts of: 
 placing a freestanding elongated spine upon but unconnected to a supporting surface;    locating terminals at ends of and above said spine in connected relation to the spine;    locating the terminals in permanent positions upon the spine so as to define a nonadjustable predetermined distance between the terminals;    attaching reinforcing wires anchors to said terminals;    placing at least one railroad tie mold upon said spine so as to be superimposed upon the spine between the terminals;    passing reinforcing wires through said mold;    attaching said wires to said anchors;    tensioning each reinforcing wire as desired;    pouring concrete into the mold around the tensioned wires.