US 5,081,802 AGranted

Method and apparatus for lining manhole assemblies and the like

AssigneePoly-Tec Products, Inc.

InventorsJames A. Westhoff, James A. Kelly, James E. Parker

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Abstract

Cast members are provided with a liner assembly to protect the cast material from corrosion. The liner assembly is formed of a plurality of curved liner sections having integral joining flanges. A resilient compressible gasket is arranged between opposing flanges and is provided with at least one flange receiving slot for receiving the flange of one of said liner sections to facilitate assembly thereof. Fastening means join the opposing flanges to compress the gasket and thereby provide a liquid-tight joint. Integral flanges are provided at the upper and lower ends of the liner sections to receive a sealant which is squeezed out of the seams formed by the mating sections when joined to protect the cast assembly from corrosion. The liner sections are formed of a material which is inert to the corrosive influences.

Claims20

Dependent claims

A liner assembly for lining the annular-shaped interior of a cast structure to protect the cast structure from corrosion, said assembly comprising:

a plurality of liner sections, each section being comprised of a curved semi-rigid member having a convex surface engaging said cast structure and a concave surface defining the interior of said structure;
said member having a plurality of spaced substantially parallel ribs integral with said member and extending into and embedded in said cast structure;
the opposing sides of each member extending substantially parallel to the longitudinal axis of said annular-shaped interior having integral flanges extending outwardly from said convex surface and into said cast member;
the flanges of each member being arranged in opposing fashion with the flanges of adjacent members forming said liner assembly;
resilient, compressible gasket means being arranged between the flanges of adjacent members;
fastening means joining the opposing flanges for compressing said gasket therebetween to form a liquid-tight seal along said joint;
said gasket being an elongated strip of resilient compressible material having a substantially oblong cross-section, said strips extending the entire length of each joint defined by the opposing flanges of adjacent liner section members;
said liner assembly providing a liquid-tight seal about the annular interior of said cast member.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/480,285Filed 15 Feb 1990
Granted: 21 Jan 1992
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

B28B 19/0038
Machines or methods for applying the material to surfaces to form a permanent layer thereon: lining the outer wall of hollow objects, e.g. pipes
B28B 7/168
Moulds for making shaped articles with cavities or holes open to the surface , e.g. with blind holes: for holders or similar hollow articles, e.g.…
E02D 29/12
Independent underground or underwater structures ; Retaining walls: manhole shafts; Other inspection or access chambers; Accessories therefor
E02D 29/122
Manhole shafts; Other inspection or access chambers; Accessories therefor: steps or handrails for shafts