Storage tanks, for example, underground septic tanks, and their methods of fabrication are provided. The tanks include a substantially liquid impermeable plastic vessel having a top, a bottom, and sides; a concrete container encasing and retaining the plastic vessel, the concrete container contacting the bottom and at least partially contacting the sides of the plastic vessel; and at least one opening for receiving effluent, for example, waste effluent, into the plastic vessel. The methods of fabricating the tanks include positioning a plastic vessel into an enclosure; introducing concrete into the enclosure about the plastic vessel; allowing the fluid concrete to cure to provide a substantially solid concrete container about the plastic vessel; and removing the plastic vessel having a concrete container from the enclosure. Vessel shape retaining devices are also disclosed. Aspects of the invention are uniquely adapted to underground storage.

Storage tanks, for example, underground septic tanks, and their methods of fabrication are provided. The tanks include a substantially liquid impermeable plastic vessel having a top, a bottom, and sides; a concrete container encasing and retaining the plastic vessel, the concrete container contacting the bottom and at least partially contacting the sides of the plastic vessel; and at least one opening for receiving effluent, for example, waste effluent, into the plastic vessel. The methods of fabricating the tanks include positioning a plastic vessel into an enclosure; introducing concrete into the enclosure about the plastic vessel; allowing the fluid concrete to cure to provide a substantially solid concrete container about the plastic vessel; and removing the plastic vessel having a concrete container from the enclosure. Vessel shape retaining devices are also disclosed. Aspects of the invention are uniquely adapted to underground storage.

A collection tank for mounting under a floor of a building for collecting water from an area under the floor comprises upper and lower tank portions removably securable by rotatable mating of tabs in cavities. Additionally, a pump platform of the tank is formed by a plurality of ridges which form therebetween a channel so that the water is collectable in the tank between the ridges. Furthermore, the upper and lower tank portions are separable, and a width of the top of the upper tank portion is smaller than a width of the open top of the lower tank portion such that the upper tank portion can be received in the lower tank portion in an inverted orientation, in which the collection tank is inoperable for collecting the water, so as to decrease a height of the collection tank.

A collection tank for mounting under a floor of a building for collecting water from an area under the floor comprises upper and lower tank portions removably securable by rotatable mating of tabs in cavities. Additionally, a pump platform of the tank is formed by a plurality of ridges which form therebetween a channel so that the water is collectable in the tank between the ridges. Furthermore, the upper and lower tank portions are separable, and a width of the top of the upper tank portion is smaller than a width of the open top of the lower tank portion such that the upper tank portion can be received in the lower tank portion in an inverted orientation, in which the collection tank is inoperable for collecting the water, so as to decrease a height of the collection tank.

An anchor assembly and related system for holding an underground tank below a ground level, including a lightweight anchor base defining a slot, and a retention mechanism that is locatable at multiple locations along the slot of the anchor base to securely maintain a strap assembly in place. The system can include the anchor assembly and the strap assembly, with the retention mechanism of the anchor assembly being movable along the slot of the anchor base to facilitate placement and adjustment of the strap assembly with respect to the anchor base.

An anchor assembly and related system for holding an underground tank below a ground level, including a lightweight anchor base defining a slot, and a retention mechanism that is locatable at multiple locations along the slot of the anchor base to securely maintain a strap assembly in place. The system can include the anchor assembly and the strap assembly, with the retention mechanism of the anchor assembly being movable along the slot of the anchor base to facilitate placement and adjustment of the strap assembly with respect to the anchor base.

Individual honeycomb shaped modules used in an assembly for underground storage of storm water and other fluid storage needs. Modules are assembled into a resultant honeycomb shape for maximized structural strength and material use efficiency. Internal hexagonal or square shaped modules are assembled and encased by external hexagonal or square shaped modules. Internal adjacent modules are in direct fluid communications with one another through a channel-less chamber. Internal hexagonal or square shaped modules drain into external hexagonal or square shaped modules chamber where fluid is either stored or drained. Assemblies include various top and side pieces along with access ports for entry into said assembly.

The present invention belongs to the field of devices for storing drinking or non-drinking water, more specifically to water tanks and large capacity water reservoirs, characterized in that a structural reinforcement is provided which withstands greater mechanical loads, in particular on the edges thereof, which loads cause cracks or fissures that damage the entire reservoir in the known prior art models.

A storage tank according to the present invention has a concrete bottom plate laid on a bottom part of a hole dug in the ground, a storage assembly provided on the bottom plate and accommodated in the hole, a concrete quadrangular tubular side wall provided around the storage assembly on the bottom plate, and a side-wall formation member configured to form the side wall into a square frame shape. The storage assembly has a plurality of square tabular partition plates, tubular spacers connected to the partition plates, and an outermost layer part provided on the outermost side of the storage assembly. The side-wall formation member has quadrangular tubular multi-step inner molds formed of a plurality of first plate members, a plurality of vertical reinforcing bars inserted into the multi-step partition plates, and a quadrangular tubular single-step outer mold which holds a plurality of second plate members by a plurality of separators.

A multi-piece plastic tank is provided and includes a tank top section, wherein the tank top section defines a tank top opening surrounded by a top flange that extends along the length of the top flange, a tank bottom section having, wherein the tank bottom section defines a tank bottom opening surrounded by a bottom flange that extends along the length of the bottom flange, wherein the top flange and bottom flange are configured to be connected to form the multi-piece plastic tank.