DD281843A5 - Device for the protection of structures against radonemetic underground - Google Patents

Abstract

The invention relates to a device for the protection of structures against radonemitierenden underground. If it is necessary to build structures with closed rooms on a radioactively contaminated subsoil, it must be ensured that the rooms do not exceed the statutory values for the load on the room air. This is achieved according to the invention by a device for foundation ventilation under the basement sole with continuous removal of radioactively contaminated soil air. The assumption is that the velocity of flow in the intermediate spaces to be created in the foundation area must be greater than the rate of diffusion through the cellar base. building; Exhalation; Fundamententlueftung; Air exchange; Radon; Radon emissions; Indoor environment; Radiation Protection; Negative pressure}

Description

Field of application of the invention

The invention solves the problem of the development of radioactively contaminated, radonemitierendem ground from the radioactive substances in the Podenluft and thus can get into the environment.

The footprint of a building to be built can be radioactively contaminated by natural or anthropogenic causes.

If the site of the construction provided in a closed design must be maintained, the building according to the invention can prevent the human organism from being contaminated by the radioactive gas radon and the resulting radon products in the building or from falling short of the radiation protection limit values / exemption limit. This applies analogously to other burdens of the soil air, the penetration of which into closed spaces of the building is prevented according to the invention.

Characteristic of the known state of the art

A development of radeemitierendem underground has been deliberately not made in the GDR.

Internationally, attempts are known to prevent penetration of the radioactive gas radon by the use of sealing materials between the structure and the subsoil or in the basement floor.

In international literature ke ^! ne detailed tasks published.

Also, no technical solutions are known that successfully prevent diffusing radon-containing soil air into a building for years.

Object of the invention

The invention creates conditions to build in certain cases mandatory buildings iueh at sites that were not suitable due to radioactive exhalations for construction and had to be blocked for reasons of radiation exposure.

The intended goal is the constant observance of the legally prescribed limit value of the effective equivalent dose. The intention is to prevent the incorporation of alpha-activity (radon and its short lived products) into the human organism of persons or groups of people temporarily or permanently present in the building. With ler inventive solution, this goal is achieved by technical measures and a development '. ^ Dioaktiv contaminated soil surfaces for economic or structural reasons allows.

Explanation of the essence of the invention

Conventional building seals against the ground in general serve the building blockage against ingress of moisture / water. The methods are well known.

The object of the invention is to reliably prevent long-term diffusing of the radioactive gas radon in the interior of the building.

According to the invention the object is achieved in that to ensure a constant discharge of radioactively contaminated soil air by a so-called foundation ventilation under the basement sole to permanently exclude diffusing structural parts in the interiors.

The assumption is that the flow velocity in the z_-creating interstices in the foundation area must be greater than the rate of diffusion of the radon through the structural parts (basement sole). This ensures compliance with the effective dose equivalent limit.

AusfOhrungsbelsplel The bottom of the excavation receives between the foundations a pack layer of uncontaminated coarse gravel with a Thickness of 200 mm. On top of that is a layer of 200mm thick concrete of high density and low pore volume

applied.

To compensate settlement cracks, motion and / or construction joints are provided on the outer and intermediate walls. over

The concrete surface is laid on bricks concrete lintels and then a reinforced concrete ribbed, 250mm thick.

This results in a ventilated cavity of about 300mm height. The resulting Wetterkan; Ie have a width

of 900mm and are offset to improve the rinsing effect. The joints of the reinforced concrete ribbed floor are filled with concrete of high density and low pore volume. On this blanket are bituminierid

Aluminum waterproofing sheets with a louver of 100mm joint sealing glued on hot. The joint seal is

gev.issenhaft execute. These geomembranes must be pulled up to the basement ceiling and protected from mechanical damage by a layer of bricks. The floor structure over the aluminum geomembranes is made of well-compacted, low-pore concrete of at least 150 mm thick.

The fresh air is supplied to the outer longitudinal walls via slots of 900mm x 100mm. The foundations of the partitions have the same louvers which, in order to create baffles, arranged offset The plan is divided into chambers, with a chamber width of 6000mm has been selected. To create a continuous flow of air, troughs (dimensions

1000mm x 600mm) with the open side to the building wall.

Each foundation chamber receives on the outer walls one shaft each (1400 χ 800mm) for the fresh air supply and the Abwetterabführung. The chambers are ventilated by suction, with a minimum of six times air exchange / hour is sought. Each chamber receives a correspondingly dimensioned fan in the exhaust duct. If an increase in the flow rate proves necessary for seasonal reasons, the fans are interchangeable. The supply channel is provided outside the building with a manhole containing a vent pipe

is put on. All cables are routed through the masonry in a protective tube, with the remaining ones

Gaps are to be shed with an elastic putty. The sewer additionally receives a trap to one Prevent activity feed through the empty sewer line (water barrier). The exterior walls are painted with lime and then insulated with hot bitumen. The isolation is by a

70mm thick masonry protected from mechanical damage.

Sealing material (e.g., clay) with a layer thickness of about 0.50 m is excavated on the construction pit flanks

Remaining space to the building is filled with loose masses (coarse gravel) and in the Ai ".tand of 1.50 m from the building with

Honeycomb cell plates covered.

Claims (5)

1. A device for the protection of structures against Radonemitierenden underground is characterized in that structurally under a suitable sealing materials insulated basement floor space, pipes or cavity systems for air circulation are available, which catches from the ground hdiffusing radioactively contaminated air and by suction or releases natural buoyancy / weathering into the atmosphere. 2. Apparatus according to claim 1, characterized in that at one or more points through air ducts atmospheric air can be sucked into the space below the basement floor and there existing radon air mixture is discharged through opposite air ducts again. 3. Apparatus according to claim 1, characterized in that according to the building size in chambers under the basement floor by two opposite air ducts per chamber permanent air circulation is guaranteed, which ensures a constant discharge of radioactively contaminated air under the entire building background. 4. The device according to claim 1, characterized in that other loading substances in the soil air, which emerge from the building surface, according to the invention ve / prevented from entering the closed spaces of the building. 5. The device according to claim 1, characterized in that a refurbishment according to the invention is carried out subsequently in existing structures.