초록 ▼

To form a substance supported inner wall of a doublewall bottom and portion of the side wall of a tank, the inner wall is formed by a ridged, ribbed, puckered or embossed aluminum foil of, for example, 0.15 mm to 0.3 mm, preferably about 0.2 mm thickness, with protrusions or projections extending to

To form a substance supported inner wall of a doublewall bottom and portion of the side wall of a tank, the inner wall is formed by a ridged, ribbed, puckered or embossed aluminum foil of, for example, 0.15 mm to 0.3 mm, preferably about 0.2 mm thickness, with protrusions or projections extending towards the outer or bottom wall. Since such foils are not available in sizes sufficient to lay out an entire tank in one unit, a plurality of foil units are placed adjacent each other, preferably with edge zones overlapped, and the overlap is bridged and connected by a fiber reinforced ribbon or tape, preferably glass fiber, the thus formed bottom wall being coated with an epoxy resin in which the glass fiber reinforced ribbon or tape is embedded. The tensile strength at the junctions is higher than the tensile strength of the foil units themselves, the plastic coating being present merely to embed the ribbon or tape fibers, retain it in position, and additionally provide a protective layer to protect the aluminum against attack from contents of the tank, but contributing little to the holding strength of the inner or top layer of the bottom wall, since the plastic layer then need be of only up to about 1 mm thickness.

대표청구항 ▼

Upright tank construction having a double bottom, including a bottom (11) and a composite top layer (13), the composite top layer being spaced from the bottom and defining a leakage test chamber between the top layer and the bottom, and in which the top layer (13) is formed by a foil or sheet elemen

Upright tank construction having a double bottom, including a bottom (11) and a composite top layer (13), the composite top layer being spaced from the bottom and defining a leakage test chamber between the top layer and the bottom, and in which the top layer (13) is formed by a foil or sheet element having projections extending from the major surface of the foil or sheet element towards the bottom layer (11), whereby the foil or sheet element will have a puckered or ribbed surface configuration at its underside, and a plastic protective layre (19) covering the surface of the foil or sheet element remote from the bottom surface, wherein the composite top layer (13) comprises a plurality of metal foil or sheet elements (17), each smaller than said bottom (11), said foil or sheet elements being of a material having a thickness and strength characteristic requisite for the top layer of the double bottom and for supporting the contents of the tank above the chamber between said bottom, and top layer said foil or sheet elements defining terminal edges, said terminal edges being placed close to each other; fiber reinforced layers (25) bridging over terminal edges and over an adjacent portion of an adjacent foil or sheet element, and a sprayed plastic layer (19) embedding said fiber reinforced layer (25) adhering to and covering over both all the foil or sheet elements and the fiber reinforced layers (25) and forming a continuous protective layer, said protective plastic layer being of a thickness sufficient for protection of the respective individual foil or sheet elements (17) and the resin layers (25) against attack from the contents of the tank without substantially contributing to the strength of the top layer.