Manhole base assembly with internal liner and method of manufacturing same
First Claim
1. A liner for use in casting within a cast manhole structure having a cast base, the liner comprising:
- an entry aperture defining an entry aperture diameter;
a first side wall having a first pipe aperture sized and positioned to be aligned with a first side opening of the cast base;
a second side wall having a second pipe aperture sized and positioned to be aligned with a second side opening of the cast base; and
a liner top wall disposed radially outwardly of said entry aperture diameter and extending between said entry aperture and said first side wall;
a flow channel extending between said first and second pipe apertures and in fluid communication with the entry aperture; and
a liner lid received in the entry aperture, the liner lid comprising;
a first lid portion sealingly engaged with a sidewall of the entry aperture; and
a second lid portion coupled to the first lid portion and moveable in an upward direction about an axis which extends across said entry aperture between a closed configuration in which the second lid portion is sealingly engaged with the entry aperture and an open configuration in which the second lid portion is disengaged from the entry aperture.
1 Assignment
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Accused Products
Abstract
A manhole base assembly and a method for making the same employ a non-cylindrical, low-volume concrete base that 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 to interface with various underground systems, and can be formed on-site to facilitate compatibility with existing structures. The assembly provides for flexible, modular 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.
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Citations
19 Claims
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1. A liner for use in casting within a cast manhole structure having a cast base, the liner comprising:
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an entry aperture defining an entry aperture diameter; a first side wall having a first pipe aperture sized and positioned to be aligned with a first side opening of the cast base; a second side wall having a second pipe aperture sized and positioned to be aligned with a second side opening of the cast base; and a liner top wall disposed radially outwardly of said entry aperture diameter and extending between said entry aperture and said first side wall; a flow channel extending between said first and second pipe apertures and in fluid communication with the entry aperture; and a liner lid received in the entry aperture, the liner lid comprising; a first lid portion sealingly engaged with a sidewall of the entry aperture; and a second lid portion coupled to the first lid portion and moveable in an upward direction about an axis which extends across said entry aperture between a closed configuration in which the second lid portion is sealingly engaged with the entry aperture and an open configuration in which the second lid portion is disengaged from the entry aperture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A manhole structure, comprising:
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a cast manhole including a east base, and a riser extending upwardly from said cast base, the riser including a lower end attached to the cast base and an opposite, upper end; and a liner cast within the east base of the cast manhole, the liner comprising; an entry aperture defining an entry aperture diameter, the entry aperture spaced below the upper end of the riser wherein at least a portion of the riser is exposed and not covered by the liner; a first side wall having a first pipe aperture sized and positioned to be aligned with a first side opening of the cast base; a second side wall having a second pipe aperture sized and positioned to be aligned with a second side opening of the cast base; and a liner top wall disposed radially outwardly of said entry aperture diameter and extending between said entry aperture and said first side wall; a flow channel extending between said first and second pipe apertures and in fluid communication with the entry aperture; and a liner lid received in the entry aperture with the cast manhole riser extending upwardly above said liner lid, the liner lid comprising; a first lid portion sealingly engaged with a sidewall of the entry aperture; and a second lid portion coupled to the first lid portion and moveable about an axis which extends across said entry aperture between a closed configuration in which the second lid portion is sealingly engaged with the entry aperture and an open configuration in which the second lid portion is disengaged from the entry aperture. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification