Manhole base assembly with internal liner and method of manufacturing same
First Claim
1. A manhole base assembly comprising:
- a cast base having a non-cylindrical outermost profile, comprising;
an upper opening having an upper opening diameter;
a first, planar base wall including a first pipe opening, said first base wall disposed radially outwardly of said upper opening diameter;
a second, planar base wall including a second pipe opening;
a third, curved outer wall extending between said first and second base walls;
a base top wall disposed radially outwardly of said upper opening diameter and extending between said upper opening and said first base wall; and
a polymeric liner received within said cast base and extending substantially between said first and second pipe openings, said liner including a flow channel disposed at a lower end of said cast base, said flow channel extending substantially between said first and second pipe openings, said first and second pipe openings aligned with respective pipe axes disposed at a first angle with respect to one another, said first angle defining a second, reflex angle, said first and second angles different from one another.
1 Assignment
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Accused Products
Abstract
A manhole base assembly and a method for making the same, in which a non-cylindrical, low-volume concrete base is fully lined to protect the concrete against chemical and physical attack while in service. This lined concrete manhole base assembly may be readily produced using a modular manhole form assembly which can be configured for a wide variety of geometrical configurations compatible with, e.g., varying pipe angles, elevations and sizes. The form assembly is configurable to provide any desired angle and elevation for the pipe apertures using existing, standard sets of form assembly materials, and may also be used in conjunction with industry-standard cylindrical casting jackets for compatibility with existing casting operations. The resulting system provides for flexible construction of a wide variety of lined manhole base assemblies at minimal cost, reduced concrete consumption and reduced operational complexity. The modular nature of the production form assembly also facilitates reduced inventory requirements when various manhole base assembly geometries are needed.
85 Citations
16 Claims
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1. A manhole base assembly comprising:
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a cast base having a non-cylindrical outermost profile, comprising; an upper opening having an upper opening diameter; a first, planar base wall including a first pipe opening, said first base wall disposed radially outwardly of said upper opening diameter; a second, planar base wall including a second pipe opening; a third, curved outer wall extending between said first and second base walls; a base top wall disposed radially outwardly of said upper opening diameter and extending between said upper opening and said first base wall; and a polymeric liner received within said cast base and extending substantially between said first and second pipe openings, said liner including a flow channel disposed at a lower end of said cast base, said flow channel extending substantially between said first and second pipe openings, said first and second pipe openings aligned with respective pipe axes disposed at a first angle with respect to one another, said first angle defining a second, reflex angle, said first and second angles different from one another. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification