DE2105271B2 - Containers, especially for the underground storage of heating oils or other aggressive substances - Google Patents

Description

The invention relates to a container, in particular for the underground storage of heating oils or other aggressive substances, with an inner container that holds the goods to be stored thin-walled plastic, which is on the inside of a protective against external stress Can support the jacket.

Such containers must withstand an internal pressure of 7.5 xH on Gi and the test regulations. Such an internal pressure is relatively easy to absorb with wall thicknesses of 2 to 3 mm with diameters of up to 3 m of the container made, for example, of glass fiber reinforced polyester, in particular with a spherical shape of the inner container.

However, such a wall thickness is not sufficient to give the container the required stability against external loads, which the container must also withstand at the prescribed height, e.g. 40t _1. Such external loads can arise during operation due to earth thrust or drive-over load. The wall thickness of known containers must be increased to 8 to 10 mm in order to absorb such external loads, which requires a considerably more expensive production and possibly leads to breaks in the container usually produced by the winding process.

ίο Containers made of thin-walled plastic are very sensitive to external stress when empty. Such stresses e.g. in the form of local pressure loads must be avoided under all circumstances, because A crack in the laminate results in leakage or diffusion of the liquids stored in the container could have. The known containers must therefore very much for the transport from the manufacturer to the construction site carefully packed and very carefully at the construction site.

must be stored. Because of the inevitable environmental hazard if the container is damaged by the leakage of the liquid stored in the container, such containers are under supervision of the Technical Monitoring Association (TUV)

as stored. The TÜV officer has to monitor that the soil in which the container is stored is free of stone (gravel bed), that the embankment from floods. is supported and that the lying down of the container with the greatest Diligence is carried out. Because of the already described sensitivity of the container to He may only be exposed to external loads, for example from his transport vehicle of a hoist and not be rolled down. Must before storage the container can be released from its packaging. It is for the storage of fuel oil or the like. A container of the type described above known (German utility model 1 811 785). i \; r inner container, which is accommodated in the jacket causing the mechanical stability, is liquid and gas-tight and chemically resistant and absorbs the fuel oil or the like. The fluid pressure does not take the inner container itself, but supports it by the fact that it is on the inner wall of the External container creates, on this from.

A fuel oil container made of two concrete shells that can be glued together has also been proposed have been, the inner walls of which have a coating of glass fiber reinforced plastic (German Publication 1939150). The manufacture is inter alia because of the difficulties in creating an adhesion between concrete and plastic expensive, and the different physical properties, especially the different The coefficient of thermal expansion of concrete and plastic make permanent adhesion more difficult.

The invention is based on the object of creating a container of the type described above, in which the inner container, which is independent of the jacket, only needs to be kept as thin as is necessary to accommodate the prescribed maximum internal pressure and which is easy to transport and without supervision at the construction site can be stored.

To solve this problem, the invention provides that the rigid, only for the internal pressure inner container measured by the liquid as

Shell of two interconnected half-shells made of a concrete-foam mixture without essential space is bordered.

The half-shells made of Styrofoam concrete serve as permanent packaging for the container that holds it on the Transport protects and the external loads caused by earth shoving or being run over in built-in State. As a result, the wall thickness of the inner container can be kept so thin that as they are about to accommodate the maximum. Internal pressures is sufficient. This is a significant economic one Advantage; because the plastic for the inner container is much more expensive and difficult to process as the concrete-foam mixture for the half-shells surrounding the inner container, so that the Inner container and the shark sharks surrounding it are together cheaper than just one made of plastic existing conventional container with a greater wall thickness, which also the mentioned external loads withstands. This also applies to the comparison with steel containers of the same size.

The invention and advantageous details of the invention are shown below on the basis of a cross section explained in more detail by an embodiment of a Bchäiter.

With the reference number 1 is a spherical inner container made of fiberglass-reinforced polyester, which has a wall thickness of 2 to 3 mm. Of the Spherical inner container can in a known way with lost cores made of Styrofoam, Polyurethanschau-n or drawn PVC trays. The inner container can also be made using Folding cores are produced. The folding core is inflated in the form of a foil ball container, wraps him in plastic, lets out the air and takes the through the manhole of the inner container Foil container out. Another way of making the container is to make it out of several to glue or weld prefabricated shell parts.

The finished inner container is provided with a lid assembly 2, which the filling opening 3 of the Switch locks.

The inner container 1 is surrounded by two half-shells 4 and 5 made of a concrete-foam mixture (Styrofoam concrete). The concrete foam off-Gemiscl consists of myropor balls embedded in concrete which, due to their low specific weight, reduce the specific weight of the mixture by about 70%, but not the static properties compared to those of pure concrete despise. The half-shells 4, 5 each have a hemispherical inner contour with a radius corresponding to the outer contour of the inner container 1 and an essentially rectangular outer contour hollow sphere adapted to the spherical inner container. The half-shells 4 and ^ are spanned by two. Steel straps 7 and 8 are held around the inner container 1.

The upper half-shell 4 is provided with a dome 9 in the area of the holder opening 3. The dome 9 comprises a dome neck 12 firmly molded into the upper half-shell 4 made of a polyester tube with a _{flange supported on the outer edge d tI} half-shell and a pipe section 13, which can be closed by the cover 14 and is close to it, in the dome neck 12 Attachment of the cover 14 serving, with the surface of the earth flush ceiling flange laterally with cast sleeves for the implementation of the necessary connection lines, e.g. the burner supply line 16, the burner return line 17 and a vent line 18. As usual, the burner supply line 16 is connected to a suction pipe 20 that extends to the bottom of the inner container 1.

With this arrangement, it is possible to level differences in the construction pit for the container, as it is only can be avoided with great effort by the construction workers digging the construction pit, balance; because the pipe section 13 wildly only at the construction site depending on the depth of the excavated pit pushed more or less deep into the dome neck of the container until the cover flange of the Pipe section 13 is approximately aligned with the surface of the earth. This will only be done after the pouring in and the ID has been adjusted Pipe section fastened in the dome neck, e.g. by gluing at 15.

1 sheet of drawings

Claims (7)

Patent claims: 1. Containers, especially for the underground storage of heating oils or other aggressive ones Substances, with an inner container made of thin-walled plastic that holds the goods to be stored, the one on the inside of an outer one that protects against external stresses Can support the jacket, characterized in that that the rigid, only dimensioned for the internal pressure of the liquid inner container (1) as a jacket of two interconnected Half-shells (4, 5) made from a concrete-foam mixture without any significant space is bordered. 2. Container according to claim 1, characterized in that the inner container (1) is spherical Has. 3. Container na ^ h claim 1 or 2, characterized characterized in that the inner container (1) is made of glass fiber reinforced polyester. 4. Container according to one of claims 1 to 3, characterized in that the half-shells (4, S) when connected, the shape of a cube with beveled edges ha ben. 5. Container according to one of claims 1 to 4, characterized in that the half-shells (4, 5) are held together by two steel straps (7, 8) spanning them. 6. Container according to one of claims 1 to 5, characterized in that on the upper (4) of the two half-shells (4, 5; a I'om (9) is provided which is a connection to the filling and emptying opening (3) of the inner container (1) manufacture 7. Container according to claim 6, characterized in that the dome (9) one in the upper Half-shell (4) firmly molded domed shark (12) and a received therein, by a Cover (14) closable pipe section (13) comprises which with connections for the required Aiischlußleitung (16, 17, 18) is provided and is connected to the dome neck (12) after the container has been stored.