JPS6212108B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is particularly applicable to sewage treatment plants, which have a heat insulating layer on at least a part of the surface, and where this heat insulating layer is provided mainly outside the container wall in an area above the ground surface. This invention relates to a container made of reinforcing steel or prestressed concrete for rotting sludge in the process of decomposing sludge.

The septic vessel must have a biological reactor to putrefy the sludge.
This is so that the biological decomposition process can proceed at as uniform a temperature as possible, regardless of the external temperature in each case. From a biological point of view, spoilage containers that are completely surrounded by a layer of insulation are most advantageous. However, the placement of the insulation layer runs into difficulties at the bottom of the container. This is because the container is then partially embedded in the ground or underground by strong and uneven pressure, and for deployment in a rift the known insulating materials generally have a low pressure resistance.
Therefore, usually only the portion of the container that is above ground level is provided with an outer insulation layer. In most cases, this is sufficient, unless the container is not particularly heavily biologically loaded and/or the container is located in strong flowing groundwater. In such cases, the base will be cooled too strongly.

In cases where there is a biological load and/or strong groundwater flow, e.g. hot rot rather than moderate rot, the ground floor should also be insulated to allow the rot process to proceed unhindered. It is necessary to do this. For this purpose, it is already known to construct the ground part of the outer insulation layer with gas concrete blocks which are sufficiently pressure-resistant. However, these gas concrete blocks must be protected both from the outside and from the inside against moisture entering or spreading, which is extremely costly.

The basic aim of the invention is to provide the possibility of equipping containers of the type mentioned at the outset with an effective thermal insulation layer in a more economical manner in parts buried underground.

This problem is solved by the present invention as follows. That is, a heat-insulating layer is provided on the inside of the container wall in the area of the container buried underground and is covered towards the inside of the container by an inner shell made of reinforced concrete.

The heat insulating layer is advantageously made of a material with high diffusion resistance, such as foam glass.

The inner shell can be supported on the container wall by pressure-tight spacers embedded in the insulation layer. The spacer is expediently made of a thermally insulating material.

An intermediate layer made of an elastic or plastic deformable material can be arranged between the thermal insulation layer and the container wall.

It is advisable for the container walls to be made of waterproof concrete, at least in the part where the insulation layer is arranged.

Advantageously, the insulation layers provided on the inner side of the container and on the outer side of the container overlap each other. Finally, a water pressure-resistant vapor barrier layer can be placed on top of the thermal insulation layer.

The advantage of this invention essentially consists in that the hydrostatic pressure of the container contents is absorbed by the inner shell in the region buried underground and transmitted to the container wall, where the annular and meridional It is to be converted into the power of.

If the insulation layer provided in the hollow space between the inner shell and the container wall is not sufficiently pressure-resistant, a corresponding pressure-resistant spacer is provided between the two shells.
In this way, the insulation layer in the bottom part of the container is relieved not only from the ground pressure of the container, but also from the hydrostatic pressure of the container contents. The invention thus also offers the possibility of providing a heat-insulating layer made of a material with high diffusion resistance, but low stiffness, such as foxtail glass, for example. The thermal barrier layer is neither in direct contact with the container contents nor exposed to hydrostatic pressures arising from the contents. The inner shell at least serves to equalize the hydrostatic pressure of the container fill. If the thermal insulation layer is made of a material that not only has sufficient heat resistance but also sufficient rigidity, neither spacers nor intermediate layers are necessary at all. In that case, the hydrostatic pressure emanating from the container filling is transmitted to the wall via the inner shell and the corresponding pressure-resistant insulation layer.

Pressure-resistant spacers are not required at all if the material of the insulation layer has a corresponding pressure resistance, but they must be made of a material that is capable of transmitting the hydrostatic pressure acting on the inner shell to the wall. Must be. The spacer must also have some degree of insulation so as not to form cold bridges. Such a spacer could, for example, be made of suitably pressure-resistant lightweight concrete.

A more detailed explanation will be given based on the drawings showing one embodiment.

The septic container 1 shown in vertical section in FIG. 1 has the shape of a body of revolution with a vertical axis S--S. The container wall 2 is made of reinforced concrete, in particular prestressed concrete. This vessel wall has a curved generatrix in the region 2' above the ground surface 3, which transitions into a conical jacket 2'' with a straight generatrix in the region buried underground. The starting level surface is marked 5, and the groundwater table is marked 6.

The container wall, in its part 2' above the ground level 3, has on its outer surface a heat-insulating layer 7 and a covering 8, which protects the heat-insulating layer 7 from the effects of the weather.

In the area 2'' buried underground 3, the container wall, which is made in particular of waterproof reinforced concrete or prestressed concrete, is covered with an intermediate layer 9 made of polyurethane foam and an insulation layer 10 provided above it. Pressure-resistant spacers 11 are embedded in these two layers, on which an inner shell 12 made of reinforced concrete rests. Thickness of the container wall in area 2'' corresponds essentially to the thickness of the container wall in section 2', the difference in wall thickness relative to the inner side of the inner shell 12 being averaged out in the form of a wedge by the transition concrete 13. There is basically no difference between the reinforced concrete forming area 2 and the reinforced concrete forming area 2''.However, each layer of insulation must be protected from moisture, otherwise the insulation decreases.

[Brief explanation of the drawing]

FIG. 1 shows a vertical cross-section of the septic container, and FIG. 2 is an enlarged dimensional view of the section of the septic container wall of FIG. Codes in the figure: 1... Container, 2... Container wall, 10
...Insulation layer, 12...Inner shell.

Claims (1)

[Claims] 1. At least a part of the surface is provided with a heat insulating layer, and the heat insulating layer is arranged on the outer surface of the container wall in the part above the ground surface, especially in the case of sewage treatment. In a reinforced or prestressed container for sludge putrefaction, a heat insulating layer 10 is arranged on the inner surface of the container wall 2 in the part of the container 1 buried underground, and an inner shell made of reinforced concrete is placed toward the inner surface of the container. A container characterized by being covered by 12. 2. A container according to claim 1, characterized in that the heat insulating layer 10 is made of a material with high diffusion resistance, such as foam glass. 3. A container according to claim 1 or 2, characterized in that the inner shell (12) is supported on the container wall by a pressure-resistant spacer (11) embedded in the heat insulating layer (10). 4. The container according to claim 3, wherein the spacer 11 is made of a heat insulating material. 5. In the container according to any one of claims 1 to 4, an intermediate layer 9 of an elastic or plastic deformable material is arranged between the heat insulating layer 10 and the container wall 2. Characteristic containers. 6. In the container according to any one of claims 1 to 5, the container wall 2 includes at least a heat insulating layer 10.
7. A container characterized in that the region 2'' provided with the container is made of watertight concrete. 7. The container according to any one of claims 1 to 6, wherein the container has an inner surface and an outer surface. A container characterized in that the provided heat insulating layers 10 and 7 overlap each other. 8. A container according to any one of claims 1 to 7, wherein a moisture proof layer 12 is provided on the heat insulating layer 10. A container characterized by: