Method of installing interface pad on concrete ties
An interface pad for a concrete tie includes a resilient contact pad to cushion the tie from any overlying parts in a railway application, such as panels in a grade crossing or rails in a turnout. The pad may be flat or a cupped shape and may be of varying size to accommodate varying tie widths. The invention further comprises means and methods to correctly secure such an interface pad to a concrete railroad tie and minimize the possibility that the interface pad will be forcibly removed from the tie during installation of the tie.
1. A method of manufacturing a concrete tie having an embedded interface pad, comprising the steps of:
providing at least one interface pad comprising a tubular body having opposed first and second ends separated by a sidewall and a contact pad on said second end;
providing a template comprising at least one opening;
placing said interface pad into said opening such that said second end abuts said template and said contact pad fits within said opening;
placing said template and said interface pad in a concrete tie form;
casting said concrete tie around said template and said interface pad such that said contact pad protrudes from said tie; and
removing said template from said tie once said concrete has hardened.
2. The method of claim 1 wherein said interface pad further comprises one or more locking tabs extending from said contact pad and said opening in said template further comprises one or more notches to accommodate said locking tabs.
3. The method of claim 2 wherein said step of removing said template comprises pulling said template over said locking tabs.
4. The method of claim 2 wherein said step of placing said interface pad into said opening comprises:
aligning at least one of said locking tabs with one of said notches;
inserting said contact pad into said opening and said aligned locking tab into said notch; and
rotating said interface pad to unalign said locking tabs and said notches.