Road structure – process – or apparatus – Pavement – Vault cover-closure
Patent
1997-02-06
1999-06-15
Lisehora, James A.
Road structure, process, or apparatus
Pavement
Vault cover-closure
52 20, E02D 2914
Patent
active
059115378
ABSTRACT:
A manhole cover of substantially monolithic construction is claimed. The manhole cover comprises a central cover portion having a center, and having a thickness that varies radially from the center in accordance with an exponential or parabolic function. An intermediate cover portion surrounds the central cover portion and has a substantially uniform thickness. An outer bearing portion surrounds the intermediate cover portion and has a thickness greater than the intermediate cover portion. The thickness of the central portion may vary radially from the center in accordance with the exponential function, t.sub.r =T.multidot.e.sup.-cB, where t.sub.r is the thickness at a given radial point r from the center, c=(r/R).sup.2, where R is the radius of the cover, B is a dispersion constant, and T is a constant that determines the thickness of the central portion at the center.
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