Static molds – Container-type molding device – And an inner removable core to form recess or opening
Patent
1995-01-24
1996-07-30
Nguyen, Khanh P.
Static molds
Container-type molding device
And an inner removable core to form recess or opening
249146, 249150, 249151, 249177, 249184, B28B 706, B28B 728
Patent
active
055404111
ABSTRACT:
A plastic liner for protecting concrete manhole interior surfaces from corrosion wherein the liner includes provisions for creating a strong mechanical lock between the liner and the interior surfaces. A side of the liner which includes the provisions has a plurality of raised hollow projections with spaced sections. The mechanical lock is created when concrete is poured against the side of the liner with the projections. The concrete at least partially enters the hollow portions and fills spaces between the projection sections. The projections also intersect to enhance the mechanical lock by preventing bulging. Liner sections cover essentially all of the manhole interior surfaces. Forming a liner section by rotationally molding the plastic and cutting gaps into the projections is also disclosed.
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Nguyen Khanh P.
Strickland Industries, Inc.
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