DE2105271A1 - Under ground storage tank - for fuel oil etc with polyester shell and polystyrene foam/concrete outer structure - Google Patents

Abstract

A container shell is enclosed in 2, connected half shells mfd, from a foam and concrete mixture (polystyrene-concrete) whose inner contours are shaped to the outer contour of the shell. Pref. the spherical shell is mfd. from fibre glass reinforced polyester.

Description

Containers, in particular for the underground storage of heating oils or other aggressive substances.

PSP-License Establishment Vaduz, kH1B-9490 Vaduz, Aubünt 839 The invention refers to a container, especially for underground storage of Heating oils or other aggressive substances with a material to be stored Container shell made of thin-walled plastic.

Such containers must have an internal pressure due to the test regulations withstand 7.5 xH. Such an internal pressure is relatively easy with wall thicknesses from 2 to 5 mm of, for example, made of glass fiber reinforced polyester Take up the container, in particular -with a spherical shape of the container shell.

However, such a wall thickness is not sufficient to the container to give the necessary stability against external loads, which of the containers also must withstand the prescribed height, e.g. 40 t. Such outdoor exposure can arise during operation due to earth thrust and overrun load. The wall thickness known container must be 8 to 10 min to absorb such external loads be increased, which is a much more expensive production and possibly breaks in the container usually made in the winding process.

Container shells made of thin-walled plastic are empty Condition very sensitive to external stress.

Such stresses, e.g. in the form of local pressure stresses, must be avoided under all circumstances, as the laminate will crack or diffusion of the liquids stored in the container to the pole. The known containers therefore have to be transported from the manufacturer to the construction site very carefully packed and at the construction site stored very carefully will. Because of the inevitable environmental hazard if the container is injured such containers become when the liquid stored in the container runs out stored under the supervision of the Technisches Uberwachungsverein (TÜV). Fler officials the TÜV has to monitor that the soil in which the container is stored, is rock-free (gravel bed) that the embankment is supported by flooding and that the loading of the container is carried out with the greatest care. Because of the already described sensitivity of the container, this may, for example can only be unloaded from his transport vehicle by means of a hoist and not about to be rolled down. Before storage, the container must be removed from its padding to be freed.

The invention is based on the task of creating a container in which the container shell only needs to be made as thin as it is to receive it the prescribed maximum internal pressure is required and is easy to transport and can be stored at the construction site without supervision.

To solve this problem it is provided according to the invention that the Container shell of two interconnected half-shells made of a concrete-foam mixture ch (Styrofoam concrete) is bordered, the inner contour of which matches the outer contour of the container shell is adapted.

The styrofoam concrete trays serve as permanent packaging for the container, which protects him during transport and which were caused by a collision or being run over Absorbs external loads when stored. This can reduce the wall thickness of the container can be kept as thin as they are just to accommodate the maximum Internal pressures is sufficient. This is a significant economic benefit; because the Surtststoff for the container shells is much more expensive and difficult processable as the concrete-foam mixture for the half-shells surrounding the container shell, so that the container shell and the half-shells enclosing them together are cheaper are than a conventional container made only of plastic with a larger Wall thickness that can withstand the aforementioned external loads. That also applies to the comparison with steel tanks of the same size.

The invention and advantageous details of the invention are in following with reference to a cross section through an embodiment of a container explained in more detail.

With the reference number 1 is a spherical container shell made of glass fiber reinforced Polyester denotes, which has a wall thickness of 2 to 3 mm. The spherical container shell can in a known manner with lost cores made of styrofoam or polyurethane foam drawn PVC trays. The container tray can also be used are made of folded tubes. The 2'altern is blown in the form of an i'olienkugelbehälters up, wraps the container shell plastic around it, deflates and picks up the foil container through the manhole of the container. Another possibility to manufacture the container consists in making it from several prefabricated shell parts to glue or weld.

The finished container shell is provided with a lid arrangement 2, which closes the filling opening 3 of the container.

The container shell 1 consists of two half-shells 4 and 5 made of a concrete-foam mixture (Styrofoam concrete) bordered. The concrete-foam mixture consists of embedded in concrete Styrofoam balls6 which, due to their low specific weight, are the specific Reduce the weight of the mixture by approx. 70 ff, but the static properties do not deteriorate compared to that of pure concrete. The half-shells have 4.5 each hemispherical inner contour with a the outer contour the container shell 1 corresponding radius and a substantially rectangular Outer contour. In the assembled state with the container shell 1, the half-shells form 4 and 5 the shape of a cube with beveled edges on the outside and one on the inside Hollow sphere closely matched to the spherical container shell. The half-shells 4 and 5 are held around the container shell 1 by two steel straps 7, 8 which span them.

The upper half-shell 4 is in the region of the container opening 3 with a Cathedral 9 provided. The dome 9 comprises a firmly molded into the upper half-shell 4 Dome neck 12 made of a polyester tube with a on the outer edge of the half-shell supporting Plawoh and a pipe section 13 received in the dome neck 12, which can be closed by a cover 14 and close to it for fastening the cover 14 serving, with the surface of the earth aligned cover flange laterally with cast Sockets 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 is provided. the Burner supply line 16 is as usual at one to the bottom of the container shell 1 reaching suction pipe 20 connected.

With this arrangement it is possible to detect differences in height in the construction pit for the container, as it takes a lot of effort to remove from the excavation pit Builders can avoid compensating; because the pipe section 13 is only at the construction site more or less depending on the depth of the excavation pit pushed deep into the dome neck of the container until the flange of the pipe section 13 is approximately flush with the surface of the earth. Only after pouring and adjustment will the pipe section is fastened in the dome neck, e.g. by gluing at 15.

Claims (7)

Expectations 1. Containers, especially for the underground storage of heating oils or other aggressive substances, with a container shell that accommodates the goods to be stored made of thin-walled plastic, d u r c h e k e n n n e i c h n e t that the Container shell (1) of two interconnected half-shells (4,5) from one Concrete foam mixture is bordered, the inner contour of the outer contour of the Container shell is adapted. 2. Container according to claim 1, d a d u r c h g e k e n n -z e i c h n e t that the container shell (1) has a spherical shape. 3. A container according to claim 1 or 2, d a d u r c h g ek e n n z e i c h n e t that the container shell (1) made of glass fiber reinforced polyester is. 4. Container according to one of claims 1 to 3, d a d u r c h g e k It is noted that the half-shells (4, 5) are connected to one another have the shape of a cube with beveled edges. 5. Container according to one of claims 1 to 4, since d u r c h g e k e It is noted that the half-shells (4, 5) are secured by two steel bands that span them t7,8) are connected to each other. 6. Container according to one of claims 1 to 5, d a d u r c h g e k It is noted that there is a dome on the upper (4) of the two half-shells (4,5) (9) is provided, which connects to the inlet and outlet opening (3) of the Produces container shell (1). 7. The container of claim 6, d a d u r c h g e k e n nz e i c h n e t that the dome (9) has a dome neck firmly molded into the upper half-shell (4) (12) and a piece of pipe received therein, which can be closed by a cover (14) (13), which with connections for the necessary connection lines (16,17,18) is provided and is connected to the tomhals (12) after the container has been stored.