US 4,254,885 A · Subterranean plastic tank

Abstract

A thin-walled, one-piece plastic tank for subterranean storage and transmission of sewage or other materials. The tank comprises a bottom wall, an arched top wall and opposed end walls. The top wall is substantially semi-circular in cross-section with a plurality of corrugations therearound. Along the apex area of the arch is a pair of manhole-like openings with an arced strengthening rib therebetween. The bottom wall is generally arced in cross-section with a radius very large compared to the radius of the cross-section of the top wall which causes the bottom wall to be generally flat. The end walls are arced in the longitudinal, cross-sectional and horizontal planes. The end walls each have a plurality of corrugations. In the root of one of the corrugations is a depression which contains a horizontal aperture for the egress or ingress of fluid materials. The bottom wall has a plurality of corrugations mating with the top wall corrugations such that the corrugations circumscribe the tank. Further, the bottom wall has a pair of regions one adjacent each end wall which contain a plurality of triangular indentations in a truss-like configuration.

Claims49

Dependent claims

A tank comprising:

a corrugated top wall elongated along a longitudinal axis and having an arched cross-section transverse to said longitudinal axis, said top wall including opposed side portions joined at an apex area;
A generally flat bottom wall elongated along the longitudinal axis and arranged to close the arched cross-section of the top wall, said top and bottom walls joined at side portion terminal side edge areas, whereby the top and bottom walls form a generally tubular structure;
opposed curvilinear end walls for closing end openings of the generally tubular structure, said end walls merging with said top wall along top wall end edge areas and joining said bottom wall along bottom wall end edge areas, said bottom wall end edge areas having a generally arched cross-section in a plane generally normal to the arched cross-section of the top wall;
and
access means for allowing access to the interior of the tank.

2 more elements

A thin-walled plastic tank for the underground storage and transmission of sewage materials, said tank comprising:

a bottom wall, an arched top wall and opposed end walls with a longitudinal axis extending between said end walls;
said bottom wall comprising a central portion having opposed side portions extending from said central portion and merging into engagement with said arched top wall at side portion terminal side edge areas, said bottom wall further including opposed portions merging into said end walls at bottom end edge areas;
said arched top wall having opposed arcuate side wall portions which merge into an apex area;
said end walls being curvilinear between both the opposed side wall portions of said top wall and between said top wall and said bottom wall end edge areas;
a plurality of first corrugations laterally spaced apart from each other along said arched top wall and extending generally transversely across said top wall at least between said side portion terminal side edge areas;
a plurality of second corrugations laterally spaced apart from each other on said end walls and extending generally between said bottom wall end edge areas and said arched top wall, each said corrugation comprising a crown area and a root area;
and
an indentation area located adjacent the top wall apex area in a root area of one of said end walls, said indentation area having an access opening therethrough, said access opening being disposed below the crown areas of adjacent corrugations and adapted to receive a tubing member placed in fluid communication with the inside of the tank.

5 more elements

Dependencies are inferred from the claim text.

Subterranean plastic tank

Life of this patent

Subterranean plastic tank

Life of this patent

Abstract

Claims49