B - Operations – Transporting – 28 – B
Patent
B - Operations, Transporting
28
B
25/103, 25/115,
B28B 21/00 (2006.01) B28B 19/00 (2006.01) B28B 21/88 (2006.01) B28B 21/90 (2006.01)
Patent
CA 2020907
The invention relates to a method and apparatus for making concrete pipe having vinyl liners. The method involves the use of an expandable core to hold a vinyl liner and a forming module. The core comprises an expandable shell which can be deformed by the forming module into an exact desired shape prior to placing the concrete around the core. First, a vinyl liner is placed on the core. The liner and core are inserted along with reinforcing into a dry-cast concrete form. Then, the form is placed on the module and the module is actuated into engagement with the inside surface of the core. The form is filled and immediately taken off of the module. The form is immediately stripped, but the core continues to hold the liner in engagement with the concrete until a complete bond is established. Finally, the core is retracted and removed from the finished lined pipe.
Cassan Maclean
International Pipe Machinery Corporation
LandOfFree
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