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.

The invention relates to a removable deflector for protecting the feet of a structure, which corrode following infiltration of water under the bottom plates and which weakens these areas. The invention concerns a removable device enabling the positioning of protection for the feet of storage tanks without a shut-down of production. The device according to the invention is a deflector element and a deflector assembly consisting of a plurality of deflector elements, capable of being positioned one after the other in order to surround the feet of the wall of the structure. Each deflector element comprises at least one downward-sloping protective plate (1), at least one flexible sealing gasket attached along the upper edge of this plate (1), and: at least one retaining arm (5) for same, wherein one of its ends is fixed to the so-called upper edge of said plate (1) and the other so-called distal end is capable of being rigidly and reversibly attached to an element of said structure and to be detached therefrom, this arm allowing the adjustment of the pressing of the sealing gasket against the wall (14) of the tank, and at least one support (6) arranged towards its lower edge and separable into at least two parts suitable for making the deflector removable, of which the upper one is attached underneath the plate (1) and the other, lower one, is attached to the support slab (23) of the structure wall (14).

A prefabricated former for an underground pump station comprises: a floor former; a plurality of vertical support elements; a side wall secured to and surrounding the plurality of vertical support elements, the side wall having an inner layer and an outer layer defining a cavity therebetween, and an opening at an upper end of the side wall in communication with the cavity for receiving concrete, the side wall extending both above and below the floor former for defining a space above the floor former and a space below the floor former, and an opening being provided between the cavity and the space below the floor former enabling concrete to flow through the cavity and into the space below the floor former; when set, the concrete forming a unitary wall and base.

A prefabricated former for an underground pump station comprises: a floor former; a plurality of vertical support elements; a side wall secured to and surrounding the plurality of vertical support elements, the side wall having an inner layer and an outer layer defining a cavity therebetween, and an opening at an upper end of the side wall in communication with the cavity for receiving concrete, the side wall extending both above and below the floor former for defining a space above the floor former and a space below the floor former, and an opening being provided between the cavity and the space below the floor former enabling concrete to flow through the cavity and into the space below the floor former; when set, the concrete forming a unitary wall and base.

An underground storage tank for the containment of liquids such as gasoline or water is comprised of a cylindrical body with ribs provided about the circumference of the body. The ribs have a cross-section in the nature of a rectangular sine wave. By providing lower ribs, no greater than one half-inch in height above the surface of the cylindrical body, and as much as five or six inches in breath, strength is maintained with a reduction in the amount of material used. The rib may be strengthened against crushing forces by providing linear material of high modulus, such as graphite or carbon fiber, in the upper portion of the rib. The resulting tank can be built to take advantage or recent changes in transportation regulations and may extend up to eight and one half feet, providing for more economical tank manufacture from source to installation.

An underground storage tank for the containment of liquids such as gasoline or water is comprised of a cylindrical body with ribs provided about the circumference of the body. The ribs have a cross-section in the nature of a rectangular sine wave. By providing lower ribs, no greater than one half-inch in height above the surface of the cylindrical body, and as much as five or six inches in breath, strength is maintained with a reduction in the amount of material used. The rib may be strengthened against crushing forces by providing linear material of high modulus, such as graphite or carbon fiber, in the upper portion of the rib. The resulting tank can be built to take advantage or recent changes in transportation regulations and may extend up to eight and one half feet, providing for more economical tank manufacture from source to installation.

A container made of plastic and having a receiving volume of 2000 to 10000 liters comprises an upper container part and a lower container part and at least one clamping device which connects the two container parts in a sealing manner. Further, a plastic blow molding process is described, which serves to produce the container.

A container made of plastic and having a receiving volume of 2000 to 10000 liters comprises an upper container part and a lower container part and at least one clamping device which connects the two container parts in a sealing manner. Further, a plastic blow molding process is described, which serves to produce the container.

A holding container includes a plurality of pre-formed, releasably interlocking, load-bearing panels configured to form an at least partially curved, load-bearing wall extending around the perimeter of at least one storage area capable of containing at least 100,000 gallons of liquids, solids or a combination thereof. At least one among the width and length of each panel is less than 102 inches in a non-load-bearing state.