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A corrugated, thin walled plastic tank is ideally suited for subterranean storage and transmission of sewage and other materials. The tank has a bottom wall which terminates in a peripheral edge disposed in a horizontal plane. A corrugated, peripheral wall extends upward from the peripheral edge to

A corrugated, thin walled plastic tank is ideally suited for subterranean storage and transmission of sewage and other materials. The tank has a bottom wall which terminates in a peripheral edge disposed in a horizontal plane. A corrugated, peripheral wall extends upward from the peripheral edge to an apex area. The corrguations of the peripheral wall include alternating crown and root portions. A peripheral rib extending circumferentially around the peripheral wall is defined by a plurality of rib portions which are disposed in the root portions of the corrugations. Each rib portion has a rib outer portion which is substantially flush with the adjoining crown portions and rib side portions which extend from the rib outer portion into the adjacent root portion. An indentation area is formed by enlarging one of the root portions. An annular sleeve depends from the indentation area into the interior of the tank to provide a fluid access with the interior of the tank. An annular rim is disposed in the apex area surrounding another opening for providing access to the interior of the tank.

대표청구항 ▼

A thin walled plastic tank for subterranean storage and transmission of materials, said tank comprising: a bottom wall having a peripheral edge disposed generally in a horizontally plane; a peripheral wall connected to and extending generally upward from the peripheral edge to an apex area, the peri

A thin walled plastic tank for subterranean storage and transmission of materials, said tank comprising: a bottom wall having a peripheral edge disposed generally in a horizontally plane; a peripheral wall connected to and extending generally upward from the peripheral edge to an apex area, the peripheral wall having a plurality of corrugations extending from the bottom wall toward the apex area, the corrugations comprising alternating crown and root portions, a plurality of rib portions disposed in the root portions of the corrugations, each rib portion having an outer portion which is substantially flush with the crown portions and side portions which extend from the outer portion into one of the root portions; and access means for allowing access to the interior of the tank.