Lined manhole assembly and liner
AssigneeStrickland Industries, Inc.
InventorJames K. Strickland
Life of this patent
Estimating the term…
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.
Claims13
A lined manhole assembly comprising:
- a base section comprising an interior floor surface and a wall, said base section wall comprising an interior wall surface, a first hole for connection to an outlet pipe, a second hole for connection to an inlet pipe, and a top surface, said interior floor surface comprising a channel for connecting sewage flow from said second hole to said first hole, and said interior floor surface being sloped downwardly toward a portion of said channel;
- an upper section vertically superimposed above said base section comprising a wall having an interior wall surface, a top surface, and a bottom surface, said bottom surface of said upper section being wider than the top surface of said upper section;
- and
- a plastic liner comprising means mechanically locking the liner to a manhole interior surface, said locking means comprising a plurality of longitudinally oriented laterally spaced raised projections, and wherein each projection including longitudinally spaced sections separated by gaps.
Dependencies are inferred from the claim text.