EP1073597B1 - Flat-bottomed tank and method for fitting it with a leak-proof coating - Google Patents
Flat-bottomed tank and method for fitting it with a leak-proof coating Download PDFInfo
- Publication number
- EP1073597B1 EP1073597B1 EP99920668A EP99920668A EP1073597B1 EP 1073597 B1 EP1073597 B1 EP 1073597B1 EP 99920668 A EP99920668 A EP 99920668A EP 99920668 A EP99920668 A EP 99920668A EP 1073597 B1 EP1073597 B1 EP 1073597B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tank
- flat
- clamping
- foil
- insert
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 11
- 239000011248 coating agent Substances 0.000 title 1
- 238000000576 coating method Methods 0.000 title 1
- 239000004033 plastic Substances 0.000 claims abstract description 30
- 229920003023 plastic Polymers 0.000 claims abstract description 30
- 238000007789 sealing Methods 0.000 claims description 31
- 239000011888 foil Substances 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000004026 adhesive bonding Methods 0.000 claims description 5
- 230000000284 resting effect Effects 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000012806 monitoring device Methods 0.000 claims description 2
- 239000011796 hollow space material Substances 0.000 claims 4
- 239000000565 sealant Substances 0.000 claims 2
- 238000009434 installation Methods 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 15
- 239000010959 steel Substances 0.000 description 15
- 229920006255 plastic film Polymers 0.000 description 11
- 239000002985 plastic film Substances 0.000 description 11
- 239000007788 liquid Substances 0.000 description 9
- 238000003860 storage Methods 0.000 description 9
- 239000011150 reinforced concrete Substances 0.000 description 7
- 239000002184 metal Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000003921 oil Substances 0.000 description 3
- 238000009420 retrofitting Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- AOSZTAHDEDLTLQ-AZKQZHLXSA-N (1S,2S,4R,8S,9S,11S,12R,13S,19S)-6-[(3-chlorophenyl)methyl]-12,19-difluoro-11-hydroxy-8-(2-hydroxyacetyl)-9,13-dimethyl-6-azapentacyclo[10.8.0.02,9.04,8.013,18]icosa-14,17-dien-16-one Chemical compound C([C@@H]1C[C@H]2[C@H]3[C@]([C@]4(C=CC(=O)C=C4[C@@H](F)C3)C)(F)[C@@H](O)C[C@@]2([C@@]1(C1)C(=O)CO)C)N1CC1=CC=CC(Cl)=C1 AOSZTAHDEDLTLQ-AZKQZHLXSA-N 0.000 description 1
- 229940126657 Compound 17 Drugs 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- -1 alkalis Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000012611 container material Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229920002457 flexible plastic Polymers 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920006264 polyurethane film Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
- B65D90/24—Spillage-retaining means, e.g. recovery ponds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/02—Wall construction
- B65D90/04—Linings
- B65D90/046—Flexible liners, e.g. loosely positioned in the container
Definitions
- the invention relates to a flat-bottom tank with a leak protection lining for storage of water polluting media and a method of equipment, in particular Retrofit, a flat bottom tank with a leak protection lining.
- Flat-bottom tanks are made of steel or reinforced concrete and are mainly used to store fuels, mineral oils, acids, alkalis, solvents or the like. In practice, both single-walled and double-walled flat-bottom tanks are used. For environmental reasons, there is a need to monitor the flat-bottom tanks for leaks, especially in the area of the tank bottom. To make this possible, single-walled storage tanks must be retrofitted with an additional leak protection lining. It is also known, for example, to weld in an additional intermediate floor made of metal and to evacuate the resulting chamber or to keep it at a pressure which is below atmospheric pressure, in order to detect leaks early on by monitoring the pressure difference.
- EP 0 705 771 A1 describes a method for producing a double-walled tank from a single-walled tank. Flat profiles are welded onto the inner tank wall and sheets are welded onto the flat profiles. From EP 0 069 303 B1 it is known to insert a knobbed film and an inner plastic cover in existing single-walled underground tanks for leak control in order to form a monitorable space between the tank wall and the stored goods. Since a plastic film is not electrically conductive, it is also proposed to arrange a metal film as a spacer onto which an electrically conductive fiber-reinforced epoxy layer is sprayed. The use of an electrically conductive polyurethane film for producing flexible inserts for containers is described in EP 0 571 868 A1.
- the aforementioned linings are very expensive to manufacture and assemble. Intermediate or additional floors are made, for example, of metal and fastened by welding inside the tank. When using flexible plastic sheeting, as far as is known, the entire interior of the tank is always lined with a so-called second wall.
- a bottom film is arranged in an oil drip pan consisting of a base plate made of concrete and walls made of stone or concrete, the wall areas of which extend to the upper edge of the walls, the film being pressed on the top by means of pressure rails Edge of the walls is held.
- the lining of the tank by means of a raised plastic floor using a dimpled film in connection with a plastic layer based on epoxy resin is described in DE 36 22 593 C2.
- the two layers also extend a little further up the side wall of the tank, the attachment of the knobbed film to the tank wall being effected by the applied epoxy resin layer.
- an inner lining consisting of a double-sided film is known for a petrol tank.
- DE-GM 67 51 479 discloses a storage container for liquids, in particular for heating oil. In the corner areas, this has connecting channels separated by baffles for vacuum generation and checking. In the storage container, a plastic trough is used, which rests on sheets that serve as spacers.
- the edge zones of the plastic trough are glued or welded to the side walls of the container and, if necessary, still secured by pressure strips, not shown.
- the height of the plastic tub is such that the sludge deposit zone is covered.
- the container is made of metal due to the required weldability of trapezoidal sheets. It should also be mentioned that the pressure strips can be pressed onto the gluing and welding points by screws with the interposition of elastic supports. However, these only serve to generate the contact pressure required during the gluing and welding process.
- the storage container is cuboid and has a flat bottom and top plate. Such a container is not actually a flat-bottom tank.
- the leak protection lining consists of a rigid, stable, prefabricated plastic tub
- the container ceiling must be removable in order to insert the plastic tub.
- the production of a separate plastic tub is associated with high costs. Precisely fitting plastic trays must be manufactured for different storage container dimensions. This solution is completely unsuitable for flat-bottom tanks, especially their retrofitting.
- a flat-bottom tank with a leak protection lining which consists of at least one pressure-stable, cavity-forming insert and a media-resistant plastic film lying on this insert, the film extending into the lower area of the inside of the tank wall and into a distance from the tank bottom is circumferentially fastened on the inside by means of a clamping device, and the insert extends up to the clamping device.
- the clamping device is usually above the maximum liquid level and consists of a circumferential tube which is pressed by means of clips against a base attached to the inner wall.
- the invention was based, a flat-bottom tank with leak protection lining the task to create that is easy to manufacture and assemble, permanently media and vacuum tight can be attached to the tank wall, and the requirements to a leakage check. Furthermore, a suitable method especially for retrofitting flat-bottom tanks with a leak protection lining be created.
- the leak protection lining for flat-bottom tanks consists of at least one pressure-stable, cavity-forming insert and a media-resistant plastic film lying on this insert.
- a corrosion-inhibiting paint coat is applied to the tank bottom or the tank bottom is coated with a liquid plastic.
- the insert is placed thereon, which in a manner known per se consists, for example, of a plastic grid or a knobbed film.
- the media-resistant film can also be provided on its underside with corresponding cavity-forming elements, such as knobs or the like.
- the necessary clamping device for fastening the leak protection lining is preferably installed on the inside of the tank wall at a short distance from the tank bottom, which is in a range of 100 to 500 mm.
- the tank bottom can be designed as a flat or curved surface.
- the clamping device consists of a stationary part, such as a circumferential flange, which can also be formed from several parts, or arranged at defined intervals, inwardly projecting bolts.
- the stationary parts form the actual holder and are particularly attached to the inside of the tank by welding or gluing.
- the movable part of the clamping device is formed by the clamping rails, the elastic sealing strips and the respective clamping means.
- the outer dimensions of the film lying on the insert are only slightly larger than the tank bottom surface, the film should protrude laterally by up to approx. 500 mm from the tank bottom surface. The film therefore only extends into the lower area of the inside of the tank wall. In this area, which is approx. 100 to 500 mm above the tank bottom, the film is attached all round to the inside of the tank wall by means of a suitable clamping device. In the case of a lateral arrangement of pipes for leakage monitoring near the tank bottom, the insert should extend below the clamping device.
- Flat-bottom tanks are usually made of steel and either lie on the ground or are arranged on appropriate supports at a short distance from the ground.
- the number of flat-bottom tanks made of reinforced concrete is relatively small compared to flat-bottom tanks made of steel. With flat-bottom tanks there is no possibility to visually check the tank bottom for leaks.
- the film Since the film is attached in the lower area of the flat-bottom tank, that is, below the lower permissible liquid level to be observed, there are hardly any problems on the tank wall due to different thermal expansions of the materials.
- the film can be attached to the inside of the tank permanently and pressure-tight with relatively simple means.
- the fastening elements are in constant contact with the storage liquid with a few exceptions, for example when cleaning a tank.
- a circumferential flange which is welded to the tank wall, is preferably used as a holder.
- the circumferential flange should consist of the same material as the tank. It is essential that the materials for the tank and the flange do not differ in their expansion coefficients. If the fastening elements for the leak protection lining were arranged in an area where the liquid level is constantly changing, problems with regard to the tightness of the wall fastening would arise as a result of considerable fluctuations in the outside temperature and the resultant different material expansions.
- a suitable clamping device consists of steel fastening bolts arranged at the same height, which are arranged at defined distances from one another, and of clamping rails that can be plugged onto the bolts, with circumferential elastic sealing strips being arranged between the clamping rails and the film and between the film and the inside of the tank wall ,
- the bolts are welded to the inside of the tank wall and, in the case of flat-bottom tanks made of reinforced concrete, glued into the reinforced concrete wall.
- the sealing tapes can be coated on one or both sides with adhesive or a sealing compound.
- the length of the individual clamping rails should be such that they can be fitted onto several adjacent bolts and can be plugged together or plugged into one another. They can also be interconnected by means of a coupling piece.
- the clamping rails have corresponding elongated holes in order to be attached to the bolts. It is important that there is no free space between two adjacent clamping rails.
- Another embodiment variant of the clamping rails consists, for example, in that a precisely fitting compensation rail is arranged between two clamping rails made of flat material and has protruding ends which overlap with the ends of the adjacent clamping rails. The mounting holes in the overlap area are aligned.
- the fastening bolts are designed as threaded bolts.
- clamping rails After attaching the clamping rails, spring washers are put on the bolts and then nuts are screwed on, which are tightened to a constant clamping tension using a torque wrench.
- the clamping rails and / or the compensating rails can also be clamped by means of eccentric levers attached to the bolts.
- the upper edge of the attached film is flush with the upper edge of the clamping rails, it being possible for a sealing compound to be applied to the peripheral edge formed in this way.
- the flat-bottomed tank made of steel shown in FIG. 1 is single-walled and consists of the tank bottom 1 and the tank wall 2. Such a closed tank is intended, for example, for the storage of heating oil and has a diameter of 18 m and a height of 11 m.
- the tank also has a closable opening designed as a manhole.
- a plastic grid 3 consisting of PE-HD, is placed on the tank bottom 1 and has a height of 5 mm.
- the plastic grid 3 serving as a cavity-forming insert covers the entire surface of the tank bottom 1 and in the area of the tank wall 2, starting from the tank bottom 1, is guided upward by about 100 mm.
- the circumferential upper angled section 3 'of the plastic grille 3 lies circumferentially on the inside 2' of the tank wall 2.
- a plastic film 4, consisting of PVC with a thickness of 1.5 mm, is placed on the insert 3 and pulled upwards in the area of the inner side 2 ′ over the section 3 ′ of the plastic grid 3.
- the outer dimensions of the plastic film 4 are approximately 250 mm larger than the area of the tank bottom 1.
- the film 4 is fastened to the inside 2 'of the tank wall 2 by means of a clamping device 5 (FIG. 2).
- steel threaded bolts 6 are welded to the inside 2 'of tank wall 2 at a height of approximately 200 mm above tank bottom 1 distributed over the circumference.
- the steel bolts 6 have a diameter of 10 mm and a length of 60 mm. They are spaced 150 mm apart and protrude into the tank interior.
- holes are made at a distance from the bolts so that the fastening region 4' of the plastic film 4 can be pushed onto the bolts 6 without creases.
- the elastic sealing tape can consist, for example, of polyurethane and has a thickness of 5 mm and a width of approx. 80 mm.
- clamping rails 9 are plugged onto the bolts, the length of the clamping rails 9 being dimensioned such that they extend over a plurality of bolts 6.
- the adjacent clamping rails 9 should rest against one another with their narrow end faces.
- the clamping rails 9 are made of steel and have a width of 80 mm and a thickness of 8 mm, as well as correspondingly spaced holes for plugging onto the bolts 6.
- 6 nuts 12 are screwed onto the threaded bolts and tightened using a torque wrench, a constant clamping voltage being set for all screw connections.
- the foil located between the two sealing tapes 7 and 8 and the sealing tapes 7 and 8 are pressed firmly against the inside 2 'of the tank wall 2 by the clamping rails 9 and the clamping tension acting on them.
- a media-tight and vacuum-tight connection is thus established between the inner wall 2 ', the sealing tapes 7 and 8 and the film arranged between the sealing tapes 7 and 8 and the clamping rails 9.
- Below the clamping device 5 the bores required for arranging the vacuum measuring line 13 and the vacuum test line 14 are provided in the tank wall 2.
- the wall thickness of the clamping rails 9 is dimensioned such that it is equal to or greater than the thickness of the tank wall 2.
- FIG. 4 shows a section of a flat-bottom tank made of reinforced concrete. Such a tank is, for example, 8 m high and covered by means of a tank ceiling 16 resting on the side walls 2.
- a plastic grid 3 with a height of 5 mm is laid on it, which covers the entire tank base 1 over the entire area.
- a media-resistant plastic film 4 is placed on the plastic grid 3 and is pulled upwards on the inner sides 2 'of the tank wall 2 at a distance of approximately 400 mm from the tank bottom 1.
- the clamping device 5 for fastening the plastic film 4 to the inside 2 'of the tank wall 2 is designed essentially analogously to the clamping device already described. In the corner areas, the clamping rails are designed as angle rails. Since the tank wall 2 consists of reinforced concrete, the fastening bolts 6 'are glued into corresponding bores in the tank wall 2 (FIG. 5).
- the threaded bolts 6 'made of steel have a length of 100 mm and a diameter of 8 mm. After the threaded bolts 6 'have been glued into the tank wall 2, they protrude approximately 50 mm into the tank interior.
- a sealing compound 17 is also applied directly on the upper edge of the clamping device 5, which is formed by the clamping rails 9, the sealing tapes 7 and 8 and the film 4 located between the sealing tapes 7 and 8.
- a standpipe 18 made of plastic is welded into the plastic film 4 and is led upwards through the tank cover 16.
- FIG. 18 A further configuration and arrangement of the clamping rails is shown in FIG.
- the clamping rails 9 extend over a plurality of bolts 6 'and are attached to them. There is a defined distance in the circumferential direction between two adjacent clamping rails 9.
- a compensating rail 9 'with two shoulders is inserted into this free space with a precise fit, the ends of the compensating rails 9' overlapping the adjacent clamping rails 9.
- FIG. 8 shows an embodiment variant in which the holder for the leak protection lining is not formed by bolts, but by a circumferential flange 19.
- the circumferential flange 19 consists of several identical sections which are butt welded to the inside 2 'of the tank wall 2, each so that the flange 19 is fastened in a media-tight manner. Positions 20, 21 identify the two weld seams.
- the welded flange 19 has a wall thickness of approximately 30 mm and a width of 80 mm.
- the flange 19 In the middle of the flange 19 there are threaded bores 22 at a distance of 150 mm each for receiving the threaded screws 23 with spring washers 24 for correspondingly fastening the film 4 by means of the clamping rails 9.
- the flange 19 In the variant shown in FIG. 8, the flange 19 is at the same height arranged as the bolts 6 according to Figures 1 to 7.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Details Of Rigid Or Semi-Rigid Containers (AREA)
- Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Description
Die Erfindung betrifft einen Flachbodentank mit Leckschutzauskleidung zur Lagerung von wassergefährdenden Medien und ein Verfahren zur Ausrüstung, insbesondere Nachrüstung, eines Flachbodentanks mit einer Leckschutzauskleidung.The invention relates to a flat-bottom tank with a leak protection lining for storage of water polluting media and a method of equipment, in particular Retrofit, a flat bottom tank with a leak protection lining.
Flachbodentanks bestehen aus Stahl oder Stahlbeton und werden vor allem zur
Lagerung von Kraftstoffen, Mineralölen, Säuren, Laugen, Lösungsmitteln oder dgl.
eingesetzt.
In der Praxis sind sowohl einwandige als auch doppelwandige Flachbodentanks im
Einsatz. Aus Umweltschutzgründen besteht die Notwendigkeit einer Überwachung der
Flachbodentanks auf Leckagen, insbesondere im Bereich des Tankbodens. Um dies zu
ermöglichen, ist es bei einwandigen Lagertanks erforderlich, diese mit einer zusätzlichen
Leckschutzauskleidung nachzurüsten. Bekannt ist z.B. auch, einen zusätzlichen
Zwischenboden aus Metall einzuschweißen und die entstehende Kammer zu
evakuieren bzw. auf einem unter Atmosphärendruck liegenden Druck zu halten, um
durch Überwachung der Druckdifferenz auftretende Leckagen frühzeitig zu erkennen.
In der EP 0 705 771 A1 ist ein Verfahren zur Herstellung eines doppelwandigen Tanks
aus einem einwandigen Tank beschrieben. An der inneren Tankwandung werden
Flachprofile angeschweißt und Bleche auf die Flachprofile aufgeschweißt.
Aus der EP 0 069 303 B1 ist bekannt, bei bestehenden einwandigen erdverlegten
Tanks zur Leckkontrolle eine Noppenfolie und eine Innenhülle aus Kunststoff
einzubringen, um zwischen der Tankwandung und dem Lagergut einen überwachbaren
Zwischenraum zu bilden. Da eine Kunststoffolie elektrisch nicht leitend ist, wird
auch vorgeschlagen, als Distanzhalter eine Metallfolie anzuordnen, auf die eine
elektrisch leitende faserverstärkte Epoxidschicht aufgesprüht wird.
Die Verwendung einer elektrisch leitfähigen Polyurethan-Folie zur Herstellung von
flexiblen Einlagen für Behälter ist in der EP 0 571 868 A1 beschrieben.
Vorgenannte Auskleidungen sind in ihrer Herstellung und Montage sehr aufwendig.
Zwischen- oder Zusatzböden werden zum Beispiel aus Metall gefertigt und durch
Schweißen im Inneren des Tanks befestigt.
Bei der Anwendung von flexiblen Kunststoffolien wird, soweit bekannt, immer der
gesamte Innenraum des Tanks mit einer sogenannten zweiten Wand ausgekleidet. Flat-bottom tanks are made of steel or reinforced concrete and are mainly used to store fuels, mineral oils, acids, alkalis, solvents or the like.
In practice, both single-walled and double-walled flat-bottom tanks are used. For environmental reasons, there is a need to monitor the flat-bottom tanks for leaks, especially in the area of the tank bottom. To make this possible, single-walled storage tanks must be retrofitted with an additional leak protection lining. It is also known, for example, to weld in an additional intermediate floor made of metal and to evacuate the resulting chamber or to keep it at a pressure which is below atmospheric pressure, in order to detect leaks early on by monitoring the pressure difference. EP 0 705 771 A1 describes a method for producing a double-walled tank from a single-walled tank. Flat profiles are welded onto the inner tank wall and sheets are welded onto the flat profiles.
From EP 0 069 303 B1 it is known to insert a knobbed film and an inner plastic cover in existing single-walled underground tanks for leak control in order to form a monitorable space between the tank wall and the stored goods. Since a plastic film is not electrically conductive, it is also proposed to arrange a metal film as a spacer onto which an electrically conductive fiber-reinforced epoxy layer is sprayed.
The use of an electrically conductive polyurethane film for producing flexible inserts for containers is described in EP 0 571 868 A1.
The aforementioned linings are very expensive to manufacture and assemble. Intermediate or additional floors are made, for example, of metal and fastened by welding inside the tank.
When using flexible plastic sheeting, as far as is known, the entire interior of the tank is always lined with a so-called second wall.
Aus der DE 38 34 656 C1 ist bekannt, daß in einer aus einer Bodenplatte aus Beton und
Wänden aus Stein oder Beton bestehenden Ölauffangwanne eine untere Folie
angeordnet ist, deren Wandbereiche sich bis zum oberen Rand der Wände erstrecken,
wobei die Folie mittels Andrückschienen am oberen Rand der Wände gehalten wird.
Die Auskleidung des Tanks mittels eines Doppelbodens aus Kunststoff unter
Anwendung einer Noppenfolie in Verbindung mit einer Kunststoffschicht auf der Basis
von Epoxidharz ist in der DE 36 22 593 C2 beschrieben. Die beiden Schichten reichen
auch noch ein Stück weit die Seitenwand des Tankes hinauf, wobei die Befestigung
der Noppenfolie an der Tankwand durch die aufgetragene Epoxidharzschicht bewirkt
wird.
Aus der DE 196 21 469 A1 ist eine aus einer zweiseitigen Folie bestehende Innenauskleidung
für einen Benzintank bekannt. Die Folie wird im Dom des Tanks mittels eines
Spannringes gehalten.
Eine Auskleidung des gesamten Innenraumes eines Tanks zur Bildung einer Doppelwand
ist jedoch sehr kostenaufwendig.
Aus der Praxis ist es bekannt, daß die Verbindung der Folie mit der Tankwandung
Schwierigkeiten bereitet, da die Verbindungsstellen medien- und vakuumdicht sein
müssen. Insbesondere bei Lagertanks aus Stahl ist noch zu berücksichtigen, daß
diese im Freien stehen und erheblichen Temperaturschwankungen ausgesetzt sind.
Zusätzlich wechselnde Flüssigkeitsstände in den Behältern wirken sich ebenfalls auf
das Dehnungsverhalten des Behältermaterials aus.
Aus dem DE-GM 67 51 479 ist ein für Flüssigkeiten, insbesondere für Heizöl,
bestimmter Lagerbehälter bekannt. Dieser weist in den Eckbereichen durch Leitbleche
abgetrennte Verbindungskanäle für eine Vakuumerzeugung und -überprüfung auf. In
dem Lagerbehälter ist eine Kunststoffwanne eingesetzt, die auf Blechen aufliegt, die
als Abstandshalter dienen. Die Randzonen der Kunststoffwanne sind mit Seitenwandungen
des Behälters verklebt oder verschweißt und gegebenenfalls noch durch
nicht dargestellte Druckleisten gesichert. Die Kunststoffwanne ist in ihrer Höhe so
ausgebildet, daß die Schlammablagerungszone überdeckt wird. Der Behälter besteht
infolge der erforderlichen Einschweißbarkeit trapezförmiger Bleche aus Metall.
Erwähnt sei noch, daß die Druckleisten durch Schrauben unter Zwischenschaltung
von elastischen Unterlagen auf die Klebe- und Schweißstellen gepreßt werden können.
Diese dienen jedoch ausschließlich dazu, die während des Kleb- und Schweißvorganges
erforderliche Anpreßkraft zu erzeugen. Der Lagerbehälter ist quaderförmig
ausgebildet und mit einer ebenen Boden- und Deckplatte versehen. Ein solcher
Behälter ist kein Flachbodentank im eigentlichen Sinne. Da die Leckschutzauskleidung
aus einer starren stabilen vorgefertigten Kunststoffwanne besteht, muß die Behälterdecke
abnehmbar sein, um die Kunststoffwanne einzusetzen. Die Herstellung einer
gesonderten Kunststoffwanne ist mit hohen Kosten verbunden. Für unterschiedliche
Lagerbehälterabmessungen müssen jeweils paßgenaue Kunststoffwannen hergestellt
werden. Diese Lösung ist für Flachbodentanks, insbesondere deren nachträglicher
Sanierung, vollkommen ungeeignet.
Aus der CH-A-484798 ist ein Flachbodentank mit Leckschutzauskleidung bekannt, der
aus mindestens einer druckstabilen, hohlraumbildenden Einlage und einer auf dieser
Einlage aufliegenden medienresistenten Folie aus Kunststoff besteht, wobei sich die
Folie bis in den unteren Bereich der Innenseite der Tankwandung erstreckt und in
einem Abstand zum Tankboden an der Innenseite mittels einer Klemmvorrichtung
umlaufend befestigt ist, und die Einlage sich bis an die Klemmvorrichtung erstreckt.
Die Klemmvorrichtung befindet sich in der Regel oberhalb des maximalen
Flüssigkeitsspiegels und besteht aus einem umlaufenden Rohr, das mittels Briden
gegen eine an der Innenwand befestigte Unterlage gepreßt wird. Diese Lösung
gewährleistet keine dauerhafte medien- und vakuumdichte Verbindung zwischen der
Auskleidungsfolie und der Tankinnenwand.From DE 38 34 656 C1 it is known that a bottom film is arranged in an oil drip pan consisting of a base plate made of concrete and walls made of stone or concrete, the wall areas of which extend to the upper edge of the walls, the film being pressed on the top by means of pressure rails Edge of the walls is held. The lining of the tank by means of a raised plastic floor using a dimpled film in connection with a plastic layer based on epoxy resin is described in DE 36 22 593 C2. The two layers also extend a little further up the side wall of the tank, the attachment of the knobbed film to the tank wall being effected by the applied epoxy resin layer.
From DE 196 21 469 A1 an inner lining consisting of a double-sided film is known for a petrol tank. The film is held in the dome of the tank using a tension ring.
Lining the entire interior of a tank to form a double wall is, however, very costly.
From practice it is known that the connection of the film to the tank wall is difficult since the connection points have to be media and vacuum tight. In particular with steel storage tanks, it must also be taken into account that they are outdoors and are exposed to considerable temperature fluctuations. Additionally changing liquid levels in the containers also affect the expansion behavior of the container material.
DE-GM 67 51 479 discloses a storage container for liquids, in particular for heating oil. In the corner areas, this has connecting channels separated by baffles for vacuum generation and checking. In the storage container, a plastic trough is used, which rests on sheets that serve as spacers. The edge zones of the plastic trough are glued or welded to the side walls of the container and, if necessary, still secured by pressure strips, not shown. The height of the plastic tub is such that the sludge deposit zone is covered. The container is made of metal due to the required weldability of trapezoidal sheets. It should also be mentioned that the pressure strips can be pressed onto the gluing and welding points by screws with the interposition of elastic supports. However, these only serve to generate the contact pressure required during the gluing and welding process. The storage container is cuboid and has a flat bottom and top plate. Such a container is not actually a flat-bottom tank. Since the leak protection lining consists of a rigid, stable, prefabricated plastic tub, the container ceiling must be removable in order to insert the plastic tub. The production of a separate plastic tub is associated with high costs. Precisely fitting plastic trays must be manufactured for different storage container dimensions. This solution is completely unsuitable for flat-bottom tanks, especially their retrofitting.
From CH-A-484798 a flat-bottom tank with a leak protection lining is known, which consists of at least one pressure-stable, cavity-forming insert and a media-resistant plastic film lying on this insert, the film extending into the lower area of the inside of the tank wall and into a distance from the tank bottom is circumferentially fastened on the inside by means of a clamping device, and the insert extends up to the clamping device. The clamping device is usually above the maximum liquid level and consists of a circumferential tube which is pressed by means of clips against a base attached to the inner wall. This solution does not guarantee a permanent media- and vacuum-tight connection between the lining foil and the inner wall of the tank.
Der Erfindung lag die Aufgabe zugrunde, einen Flachbodentank mit Leckschutzauskleidung zu schaffen, die einfach herzustellen und zu montieren ist, dauerhaft medien- und vakuumdicht an der Tankwandung befestigbar ist, und die Anforderungen an eine Leckageüberprüfung erfüllt. Ferner soll ein geeignetes Verfahren, insbesondere zum Nachrüsten von Flachbodentanks mit einer Leckschutzauskleidung geschaffen werden.The invention was based, a flat-bottom tank with leak protection lining the task to create that is easy to manufacture and assemble, permanently media and vacuum tight can be attached to the tank wall, and the requirements to a leakage check. Furthermore, a suitable method especially for retrofitting flat-bottom tanks with a leak protection lining be created.
Erfindungsgemäß wird die Aufgabe durch die im Anspruch 1 angegebenen Merkmale
gelöst. Geeignete Ausgestaltungsvarianten sind in den Ansprüchen 2 bis 15
angegeben. Die vorgeschlagene Verfahrensweise ist Gegenstand des Anspruches 16.
Geeignete Ausgestaltungen sind in den Ansprüchen 17 bis 19 beschrieben.
Die Leckschutzauskleidung für Flachbodentanks besteht aus mindestens einer druckstabilen,
hohlraumbildenden Einlage und einer auf dieser Einlage aufliegenden
medienresistenten Folie aus Kunststoff. Vor Einbringung der Leckschutzauskleidung
als Nachrüstung ist zu prüfen, ob der Tankboden den Dichtheitsanforderungen
genügt Gegebenenfalls wird auf den Tankboden noch ein korrosionshemmender
Farbstoffanstrich aufgebracht oder der Tankboden wird mit einem Flüssigkunststoff
beschichtet. Nach vorliegender Dichtheit des Tankbodens wird auf diesen die Einlage
aufgelegt, die in an sich bekannter Weise z.B. aus einem Kunststoffgitter oder einer
Noppenfolie besteht. Die medienresistente Folie kann auch an ihrer Unterseite mit
entsprechenden hohlraumbildenden Elementen, wie z.B. Noppen oder dgl., versehen
sein. According to the invention the object is achieved by the features specified in
The leak protection lining for flat-bottom tanks consists of at least one pressure-stable, cavity-forming insert and a media-resistant plastic film lying on this insert. Before installing the leak protection lining as a retrofit, check whether the tank bottom meets the tightness requirements. If necessary, a corrosion-inhibiting paint coat is applied to the tank bottom or the tank bottom is coated with a liquid plastic. After the tightness of the tank bottom is present, the insert is placed thereon, which in a manner known per se consists, for example, of a plastic grid or a knobbed film. The media-resistant film can also be provided on its underside with corresponding cavity-forming elements, such as knobs or the like.
In bestimmten Anwendungsfällen kann es auch zweckmäßig sein, zwischen dem
Tankboden und der Einlage eine weitere Folie anzuordnen. Wichtig ist, daß zwischen
den beiden Folien oder der auf der Einlage aufliegenden Folie und dem Tankboden ein
geeigneter Zwischenraum für eine Leckageüberwachung gebildet wird.
Die erforderliche Klemmvorrichtung zur Befestigung der Leckschutzauskleidung ist
vorzugsweise in einem geringen Abstand zum Tankboden, der in einem Bereich von
100 bis 500 mm liegt, an der Innenseite der Tankwandung installiert. Der Tankboden
kann als ebene oder gewölbte Fläche ausgebildet sein. Die Klemmvorrichtung besteht
aus einem stationären Teil, wie einem umlaufenden Flansch, der auch aus mehreren
Teilstücken gebildet sein kann, oder in definierten Abständen angeordneten, nach
innen ragenden Bolzen. Die stationären Teile bilden die eigentliche Halterung und
werden insbesondere durch Schweißen oder Kleben an der Tankinnenseite befestigt.
Den beweglichen Teil der Klemmvorrichtung bilden die Klemmschienen, die
elastischen Dichtungsbänder und die jeweiligen Spannmittel. Die auf der Einlage
aufliegende Folie ist in ihren äußeren Abmessungen nur geringfügig größer als die
Tankbodenfläche, wobei die Folie die Tankbodenfläche seitlich um bis zu ca. 500 mm
überragen sollte. Die Folie erstreckt sich demzufolge nur bis in den unteren Bereich
der Innenseite der Tankwandung. In diesem Bereich, der sich ca. 100 bis 500 mm
oberhalb des Tankbodens befindet, ist die Folie mittels einer geeigneten Klemmvorrichtung
umlaufend an der Innenseite der Tankwandung befestigt. Bei einer
seitlichen Anordnung von Rohrleitungen zur Leckageüberwachung in Tankbodennähe
sollte sich die Einlage noch bis unterhalb der Klemmvorrichtung erstrecken.
Flachbodentanks bestehen in der Regel aus Stahl und liegen entweder auf dem
Erdboden auf oder sind auf entsprechenden Auflagern in einem geringen Abstand zum
Erdreich angeordnet. Die Anzahl der aus Stahlbeton gefertigten Flachbodentanks ist
im Vergleich zu den Flachbodentanks aus Stahl relativ gering. Bei Flachbodentanks
besteht keine Möglichkeit, den Tankboden visuell auf Dichtheit zu überprüfen. Um zu
verhindern, daß Leckagen in das Erdreich gelangen können, ist es bisher lediglich
bekannt, in den Flachbodentank einen neuen Zwischenboden, z.B. aus Stahl,
einzuschweißen und eine Leckageüberwachungseinrichtung anzuordnen.
Im Vergleich dazu ist die vorgeschlagene Lösung wesentlich kostengünstiger und
erfordert nur einen geringen Montageaufwand. Da die Befestigung der Folie im unteren
Bereich des Flachbodentanks erfolgt, also unterhalb des einzuhaltenden unteren
zulässigen Flüssigkeitsspiegels, treten an der Tankwandung kaum Probleme infolge
unterschiedlicher Wärmeausdehnungen der Materialien auf. Die Folie kann so mit
relativ einfachen Mitteln dauerhaft und druckdicht an der Tankinnenwandung befestigt
werden. Die Befestigungselemente stehen bis auf wenige Ausnahmen, z.B. bei einer
Tankreinigung, ständig in Kontakt mit der Lagerflüssigkeit. In certain applications it can also be useful to arrange a further film between the tank bottom and the insert. It is important that a suitable space for leakage monitoring is formed between the two foils or the foil lying on the insert and the tank bottom.
The necessary clamping device for fastening the leak protection lining is preferably installed on the inside of the tank wall at a short distance from the tank bottom, which is in a range of 100 to 500 mm. The tank bottom can be designed as a flat or curved surface. The clamping device consists of a stationary part, such as a circumferential flange, which can also be formed from several parts, or arranged at defined intervals, inwardly projecting bolts. The stationary parts form the actual holder and are particularly attached to the inside of the tank by welding or gluing. The movable part of the clamping device is formed by the clamping rails, the elastic sealing strips and the respective clamping means. The outer dimensions of the film lying on the insert are only slightly larger than the tank bottom surface, the film should protrude laterally by up to approx. 500 mm from the tank bottom surface. The film therefore only extends into the lower area of the inside of the tank wall. In this area, which is approx. 100 to 500 mm above the tank bottom, the film is attached all round to the inside of the tank wall by means of a suitable clamping device. In the case of a lateral arrangement of pipes for leakage monitoring near the tank bottom, the insert should extend below the clamping device. Flat-bottom tanks are usually made of steel and either lie on the ground or are arranged on appropriate supports at a short distance from the ground. The number of flat-bottom tanks made of reinforced concrete is relatively small compared to flat-bottom tanks made of steel. With flat-bottom tanks there is no possibility to visually check the tank bottom for leaks. In order to prevent leakages from getting into the ground, it has so far only been known to weld a new intermediate floor, for example made of steel, into the flat-bottom tank and to arrange a leakage monitoring device.
In comparison, the proposed solution is significantly less expensive and requires little assembly effort. Since the film is attached in the lower area of the flat-bottom tank, that is, below the lower permissible liquid level to be observed, there are hardly any problems on the tank wall due to different thermal expansions of the materials. The film can be attached to the inside of the tank permanently and pressure-tight with relatively simple means. The fastening elements are in constant contact with the storage liquid with a few exceptions, for example when cleaning a tank.
Bevorzugt wird als Halterung ein umlaufender Flansch eingesetzt, der an der
Tankwandung angeschweißt wird. Der umlaufende Flansch sollte aus dem gleichen
Material bestehen wie der Tank. Wesentlich ist, daß sich die Materialien für den Tank
und den Flansch in ihren Ausdehnungskoeffizienten nicht unterscheiden.
Bei einer Anordnung der Befestigungselemente für die Leckschutzauskleidung in
einem Bereich, wo sich ständig der Flüssigkeitsspiegel ändert, würden infolge erheblicher
Außentemperaturschwankungen und dadurch bedingter unterschiedlicher
Materialausdehnungen Probleme hinsichtlich der Dichtheit der Wandbefestigung
auftreten. Eine geeignete Klemmvorrichtung besteht aus in gleicher Höhe
angeordneten Befestigungsbolzen aus Stahl, die in definierten Abständen zueinander
angeordnet sind, sowie aus auf die Bolzen aufsteckbare Klemmschienen, wobei
zwischen den Klemmschienen und der Folie und zwischen der Folie und der Innenseite
der Tankwandung umlaufende elastische Dichtungsbänder angeordnet sind. Im
Falle von Flachbodentanks aus Stahl sind die Bolzen an der Innenseite der Tankwandung
angeschweißt und bei Flachbodentanks aus Stahlbeton in die Stahlbetonwand
eingeklebt. Die Dichtungsbänder können ein- oder beidseitig mit Klebstoff oder
einer Dichtmasse beschichtet sein. Um die erforderliche dichte Verbindung zwischen
der Folie und der Innenseite der Tankwandung zu erreichen, ist auf die Klemmschienen
umlaufend ein möglichst gleichmäßiger Anpreßdruck auszuüben. Die
einzelnen Klemmschienen sollten in ihrer Länge so bemessen sein, daß sie auf
mehrere benachbarte Bolzen aufsteckbar und zusammen- oder ineinandersteckbar
ausgebildet sind. Sie können auch mittels eines Kupplungsstückes untereinander
verbindbar sein. Die Klemmschienen weisen entsprechende Langlöcher auf, um auf
die Bolzen aufgesteckt zu werden. Wichtig ist, daß zwischen zwei benachbarten
Klemmschienen kein Freiraum besteht.
Eine andere Ausführungsvariante der Klemmschienen besteht z.B. darin, daß
zusätzlich zwischen zwei aus Flachmaterial bestehenden Klemmschienen eine
paßgenaue Ausgleichsschiene angeordnet ist, die überstehende Enden aufweist, die
mit den Enden der benachbarten Klemmschienen überlappen. Die Befestigungslöcher
im Überlappungsbereich sind deckungsgleich angeordnet. Die Befestigungsbolzen
sind als Gewindebolzen ausgebildet. Nach dem Aufsetzen der Klemmschienen werden
auf die Bolzen Federringe aufgesteckt und anschließend Muttern aufgeschraubt, die
mittels eines Drehmomentenschlüssels auf eine konstante Klemmspannung
angezogen werden. An Stelle einer Schraubverbindung können die Klemmschienen
und/oder die Ausgleichsschienen auch mittels an den Bolzen befestigter Exzenterhebel
festgeklemmt werden. Die obere Kante der befestigten Folie schließt bündig mit
der Oberkante der Klemmschienen ab, wobei auf die so gebildete umlaufende Kante
noch eine Versiegelungsmasse aufgebracht werden kann. A circumferential flange, which is welded to the tank wall, is preferably used as a holder. The circumferential flange should consist of the same material as the tank. It is essential that the materials for the tank and the flange do not differ in their expansion coefficients.
If the fastening elements for the leak protection lining were arranged in an area where the liquid level is constantly changing, problems with regard to the tightness of the wall fastening would arise as a result of considerable fluctuations in the outside temperature and the resultant different material expansions. A suitable clamping device consists of steel fastening bolts arranged at the same height, which are arranged at defined distances from one another, and of clamping rails that can be plugged onto the bolts, with circumferential elastic sealing strips being arranged between the clamping rails and the film and between the film and the inside of the tank wall , In the case of flat-bottom tanks made of steel, the bolts are welded to the inside of the tank wall and, in the case of flat-bottom tanks made of reinforced concrete, glued into the reinforced concrete wall. The sealing tapes can be coated on one or both sides with adhesive or a sealing compound. In order to achieve the required tight connection between the film and the inside of the tank wall, a pressure that is as uniform as possible must be exerted all around on the clamping rails. The length of the individual clamping rails should be such that they can be fitted onto several adjacent bolts and can be plugged together or plugged into one another. They can also be interconnected by means of a coupling piece. The clamping rails have corresponding elongated holes in order to be attached to the bolts. It is important that there is no free space between two adjacent clamping rails.
Another embodiment variant of the clamping rails consists, for example, in that a precisely fitting compensation rail is arranged between two clamping rails made of flat material and has protruding ends which overlap with the ends of the adjacent clamping rails. The mounting holes in the overlap area are aligned. The fastening bolts are designed as threaded bolts. After attaching the clamping rails, spring washers are put on the bolts and then nuts are screwed on, which are tightened to a constant clamping tension using a torque wrench. Instead of a screw connection, the clamping rails and / or the compensating rails can also be clamped by means of eccentric levers attached to the bolts. The upper edge of the attached film is flush with the upper edge of the clamping rails, it being possible for a sealing compound to be applied to the peripheral edge formed in this way.
Der Einsatz eines umlaufenden Flansches an Stelle der Bolzen erfolgt vor allem beim
Nachrüsten von Flachbodentanks aus Metall. Der umlaufende Flansch wird aus
einzelnen Teilstücken gebildet, die Stoß an Stoß angeschweißt werden. Die nur wenige
Zentimeter breiten Flansche besitzen eine Wanddicke die gleich oder größer ist als die
Dicke der hohlraumbildenden Einlage. Die Wanddicke des Flansches soll der
Wanddicke der Tankwandung entsprechen. Der Flansch kann mit Gewindebohrungen
zur Aufnahme von Befestigungsschrauben versehen sein oder ist mit beabstandeten
Gewindebolzen ausgerüstet.
Die Erfindung soll nachstehend näher erläutert werden. In der zugehörigen Zeichnung
zeigen
- Fig. 1
- ein Teilstück eines schematisch dargestellten Flachbodentanks aus Stahl mit Leckschutzauskleidung, als Längsschnitt,
- Fig. 2
- die Einzelheit "A"
gemäß Figur 1 in vergrößerter Darstellung, - Fig. 3
- eine weitere Ausführungsvariante eines schematisch dargestellten Flachbodentanks aus Stahl mit Leckschutzauskleidung, als Längsschnitt,
- Fig. 4
- ein Teilstück eines schematisch dargestellten Flachbodentanks aus Stahlbeton mit Leckschutzauskleidung, als Längsschnitt,
- Fig. 5
- die Einzelheit "B" gemäß
Figur 4 in vergrößerter Darstellung, - Fig. 6
- einen Schnitt gemäß der Linie A-A in
Figur 5, - Fig. 7
- eine weitere Ausführungsvariante der Klemmschienen gemäß einem
Schnitt entlang der Linie A-A in
Figur 5 und - Fig. 8
- ein Teilstück eines schematisch dargestellten Flachbodentanks aus Stahl mit an einem Flansch befestigter Leckschutzauskleidung, als Längsschnitt.
The invention will be explained in more detail below. Show in the accompanying drawing
- Fig. 1
- a section of a schematically illustrated flat-bottom tank made of steel with a leak protection lining, as a longitudinal section,
- Fig. 2
- the detail "A" according to Figure 1 in an enlarged view,
- Fig. 3
- another embodiment variant of a schematically illustrated flat-bottom tank made of steel with a leak protection lining, as a longitudinal section,
- Fig. 4
- a section of a schematically illustrated flat-bottom tank made of reinforced concrete with a leak protection lining, as a longitudinal section,
- Fig. 5
- the detail "B" according to Figure 4 in an enlarged view,
- Fig. 6
- 5 shows a section along the line AA in FIG. 5,
- Fig. 7
- a further embodiment of the clamping rails according to a section along the line AA in Figure 5 and
- Fig. 8
- a section of a schematically illustrated flat-bottom tank made of steel with a leak protection lining attached to a flange, as a longitudinal section.
Der in Figur 1 gezeigte Flachbodentank aus Stahl ist einwandig ausgebildet und
besteht aus dem Tankboden 1 und der Tankwandung 2. Ein derartiger geschlossener
Tank ist z.B. für die Lagerung von Heizöl bestimmt und weist einen Durchmesser von
18 m und eine Höhe von 11 m auf. Der Tank besitzt außerdem eine als Mannloch
ausgebildete verschließbare Öffnung. Vor der Einbringung einer Leckschutzauskleidung
wird der leere Tank gereinigt und der Tankboden 1 auf Dichtheit
untersucht und erforderlichenfalls ausgebessert und mit einem korrosionshemmenden
Anstrich versehen oder mit einem härtbaren Flüssigkunststoff versiegelt.
Auf dem Tankboden 1 wird ein Kunststoffgitter 3, bestehend aus PE-HD, aufgelegt, das
eine Höhe von 5 mm besitzt. Das als hohlraumbildende Einlage dienende Kunststoffgitter
3 bedeckt die gesamte Fläche des Tankbodens 1 und ist im Bereich der
Tankwandung 2, vom Tankboden 1 ausgehend, noch ca. 100 mm nach oben geführt.
Der umlaufende obere abgewinkelte Abschnitt 3' des Kunststoffgitters 3 liegt
umlaufend an der Innenseite 2' Tankwandung 2 an. Auf die Einlage 3 wird eine Kunststoffolie
4, bestehend aus PVC mit einer Dicke von 1,5 mm, aufgelegt und im Bereich
der Innenseite 2' nach oben, über den Abschnitt 3' des Kunststoffgitters 3, gezogen.
Die Kunststoffolie 4 ist in ihren äußeren Abmessungen um ca. 250 mm größer als die
Fläche des Tankbodens 1. Die Befestigung der Folie 4 an der Innenseite 2' der Tankwandung
2 erfolgt mittels einer Klemmvorrichtung 5 (Fig. 2). Hierzu sind an der Innenseite
2' Tankwandung 2 in einer Höhe von ca. 200 mm oberhalb des Tankbodens 1
über den Umfang verteilt Stahlgewindebolzen 6 angeschweißt. Die Stahlbolzen 6
besitzen einen Durchmesser von 10 mm und eine Länge von 60 mm. Sie sind in einem
Abstand von 150 mm zueinander angeordnet und ragen in den Tankinnenraum. In dem
umlaufenden Befestigungsabschnitt 4' der Kunststoffolie 4 sind im Abstand der
Bolzen 6 Löcher eingebracht, so daß der Befestigungsbereich 4' der Kunststoffolie 4
faltenfrei auf die Bolzen 6 aufgesteckt werden kann. Zuerst wird jedoch auf die Bolzen
6 ein erstes umlaufendes elastisches Dichtungsband 7, das beidseitig klebstoffbeschichtet
ist, aufgesteckt und mit seiner Außenseite an der Innenseite 2' Tankwandung
2 festgeklebt. Das elastische Dichtungsband kann z.B. aus Polyurethan
bestehen und besitzt eine Dicke von 5 mm und eine Breite von ca. 80 mm. Nach der
Befestigung des Dichtungsbandes 7 an der Innenseite 2' Tankwandung 2 wird der
Schutzfilm von der Innenseite des Dichtungsbandes 7 schrittweise abgezogen und die
Folie 4 auf die Bolzen aufgesteckt und an dem Dichtungsband 7 festgeklebt. Beim
Aufkleben der Folie 4 ist darauf zu achten, daß sich keine Falten bilden. Der Außenrand
der Folie 4 soll bündig mit der Oberkante des Dichtungsbandes 7 abschließen.
Auf die angeklebte Folie 4 wird ein zweites Dichtungsband 8 aufgeklebt, das analog
wie das erste Dichtungsband 7 ausgebildet ist. Die beiden Dichtungsbänder 7 und 8
sind bereits mit vorbereiteten Löchern versehen, die entsprechend dem Abstand der
Befestigungsbolzen 6 angeordnet sind. Anschließend werden auf die Bolzen 6 Klemmschienen
9 aufgesteckt, wobei die Länge der Klemmschienen 9 so bemessen ist, daß
sich diese über mehrere Bolzen 6 erstrecken. Die benachbarten Klemmschienen 9
sollten mit ihrer schmalen Stirnseite aneinander anliegen. Die Klemmschienen 9
bestehen aus Stahl und besitzen eine Breite von 80 mm und eine Dicke von 8 mm,
sowie entsprechend beabstandete Löcher zum Aufstecken auf die Bolzen 6. Nach dem
Aufstecken der Klemmschienen 9 werden auf die überstehenden Bolzen 6 Federringe
10 und auf diese jeweils eine Unterlegscheibe 11 aufgesteckt. Abschließend werden
auf die Gewindebolzen 6 Muttern 12 aufgeschraubt und mittels eine Drehmomentenschlüssels
fest angezogen, wobei für alle Schraubverbindungen eine konstante
Klemmspannung eingestellt wird.
Die zwischen den beiden Dichtungsbändern 7 und 8 befindliche Folie sowie die
Dichtungsbänder 7 und 8 werden durch die Klemmschienen 9 und die auf diese
wirkende Klemmspannung fest an die Innenseite 2' der Tankwandung 2 gepreßt.
Zwischen der Innenwandung 2', den Dichtungsbändern 7 und 8 sowie der zwischen
den Dichtungsbändern 7 und 8 angeordneten Folie sowie den Klemmschienen 9 ist
somit eine medien- und vakuumdichte Verbindung hergestellt.
Unterhalb der Klemmvorrichtung 5 sind in der Tankwandung 2 die erforderlichen
Bohrungen zur Anordnung der Vakuummeß- 13 und Vakuumprüfleitung 14
vorgesehen. Die Wanddicke der Klemmschienen 9 ist so bemessen, daß diese gleich
oder größer ist als die Dicke der Tankwand 2.
Bei der in der Figur 3 gezeigten Ausführungsvariante ist im Vergleich zu der Variante
gemäß den Figuren 1 und 2 zusätzlich noch eine Kunststoffolie 15 unmittelbar auf dem
Tankboden 1 aufgelegt, die im Bereich unterhalb der Klemmvorrichtung 5 mit der auf
dem Kunststoffgitter 3 aufliegenden Folie 4 verschweißt ist. Zwischen den beiden
Folien 15 und 4 befindet sich das Kunststoffgitter 3 zur Bildung des Leckageüberwachungsraumes.
Diese Ausführung kommt insbesondere dann zur Anwendung,
wenn der vorhandene Tankboden vor seiner Sanierung bereits undichte Stellen
aufwies, oder aufgrund der in dem Tank zu lagernden Flüssigkeit besonders hohe
sicherheitstechnische Anforderungen gestellt sind.
Die Befestigung der Folie 4 an der Tankinnenwandung erfolgt analog wie bei der
Ausführung gemäß den Figuren 1 und 2.
In der Figur 4 ist ein Teilstück eines Flachbodentanks aus Stahlbeton gezeigt. Ein
derartiger Tank ist z.B. 8 m hoch und mittels einer auf den Seitenwänden 2
aufliegenden Tankdecke 16 abgedeckt. Nach der erfolgten Sanierung des Tankbodens
1 ist auf diesem ein Kunststoffgitter 3 mit einer Höhe von 5 mm ausgelegt, das
ganzflächig den gesamten Tankboden 1 bedeckt. Auf das Kunststoffgitter 3 ist eine
medienresistente Kunststoffolie 4 aufgelegt, die an den Innenseiten 2' der
Tankwandung 2 in einem Abstand von ca. 400 mm vom Tankboden 1 nach oben
gezogen ist.
Die Klemmvorrichtung 5 zur Befestigung der Kunststoffolie 4 an der Innenseite 2' der
Tankwandung 2 ist im wesentlichen analog wie die bereits beschriebene Klemmvorrichtung
ausgebildet. In den Eckbereichen sind die Klemmschienen als Winkelschienen
ausgebildet. Da die Tankwandung 2 aus Stahlbeton besteht, sind die
Befestigungsbolzen 6' in entsprechenden Bohrungen der Tankwandung 2 eingeklebt
(Fig. 5). Die aus Stahl bestehenden Gewindebolzen 6' besitzen eine Länge von 100 mm
und einen Durchmesser von 8 mm. Nach dem Einkleben der Gewindebolzen 6' in der
Tankwand 2 ragen diese ca. 50 mm in den Tankinnenraum hinein. Die Gewindebolzen
6' sind alle im gleichen Abstand vom Tankboden 1 angeordnet, der 400 mm beträgt.
Der Abstand zwischen den einzelnen Gewindebolzen 6' beträgt jeweils 145 mm.
Unmittelbar auf der oberen Kante der Klemmvorrichtung 5, die durch die Klemmschienen
9, die Dichtungsbänder 7 und 8 sowie die zwischen den Dichtungsbändern 7
und 8 befindliche Folie 4 gebildet ist, ist noch eine Versiegelungsmasse 17
aufgetragen. In die Kunststoffolie 4 ist ein Standrohr 18 aus Kunststoff eingeschweißt,
das durch die Tankdecke 16 nach oben geführt ist. In diesem Standrohr 18 ist ein an
sich bekannter Meßfühler installiert, der eventuelle Leckagen infolge von undichten
Stellen in der Folie 4 erkennt, die an einer außerhalb des Tanks angeordneten Meßeinrichtung
angezeigt werden.
In der Figur 7 ist eine weitere Ausgestaltung und Anordnung der Klemmschienen
gezeigt. Die Klemmschienen 9 erstrecken sich dabei über mehrere Bolzen 6' und sind
auf diesen aufgesteckt. Zwischen zwei benachbarten Klemmschienen 9 besteht in
Umfangsrichtung ein definierter Abstand. In diesen Freiraum wird paßgenau eine
Ausgleichsschiene 9' mit zwei Absätzen eingesetzt, wobei die Enden der Ausgleichsschienen
9' die benachbarten Klemmschienen 9 überlappen. Die Länge der
Ausgleichsschienen 9' ist größer als der Abstand zwischen zwei Bolzen 6' und die
Befestigungslöcher der Klemmschienen 9 und der Ausgleichsschienen 9' sind
deckungsgleich.
Im Unterschied zu den bisherigen Figuren 1 bis 7 ist in der Figur 8 eine Ausführungsvariante
gezeigt, bei der die Halterung für die Leckschutzauskleidung nicht durch
Bolzen, sondern durch einen umlaufenden Flansch 19 gebildet wird. Der umlaufende
Flansch 19 besteht aus mehreren identischen Teilstücken, die Stoß an Stoß an der
Innenseite 2' der Tankwandung 2 angeschweißt werden, jeweils so, daß der Flansch 19
mediendicht befestigt ist. Die Positionen 20, 21 kennzeichnen die beiden
Schweißnähte. Der angeschweißte Flansch 19 besitzt eine Wanddicke von ca. 30 mm
und eine Breite von 80 mm. In der Mitte des Flansches 19 befinden sich jeweils im
Abstand von 150 mm Gewindebohrungen 22 zur Aufnahme der Gewindeschrauben 23
mit Federringen 24 zur entsprechenden Befestigung der Folie 4 mittels der
Klemmschienen 9. Bei der in Figur 8 gezeigten Variante ist der Flansch 19 in der
gleichen Höhe wie die Bolzen 6 gemäß den Figuren 1 bis 7 angeordnet.The flat-bottomed tank made of steel shown in FIG. 1 is single-walled and consists of the
The foil located between the two sealing
Below the
In the embodiment variant shown in FIG. 3, in comparison to the variant according to FIGS. 1 and 2, a plastic film 15 is additionally placed directly on the
The
FIG. 4 shows a section of a flat-bottom tank made of reinforced concrete. Such a tank is, for example, 8 m high and covered by means of a
The
A further configuration and arrangement of the clamping rails is shown in FIG. The clamping rails 9 extend over a plurality of bolts 6 'and are attached to them. There is a defined distance in the circumferential direction between two adjacent clamping rails 9. A compensating rail 9 'with two shoulders is inserted into this free space with a precise fit, the ends of the compensating rails 9' overlapping the adjacent clamping rails 9. The length of the compensating rails 9 'is greater than the distance between two bolts 6' and the fastening holes of the clamping rails 9 and the compensating rails 9 'are congruent.
In contrast to the previous FIGS. 1 to 7, FIG. 8 shows an embodiment variant in which the holder for the leak protection lining is not formed by bolts, but by a
Claims (18)
- Flat-bottom tank having a leakproofing lining consisting of at least one pressure-stable insert (3) forming a hollow space, and of a media-resistant plastic foil (4) which rests on said insert (3), extends into the lower region of the inside (2') of the tank wall (2) and is secured all the way around on the inside (2') at a spacing from the tank bottom (1) by means of a clamping device (5), and the insert (3) covers the available tank bottom (1) and extends at most as far as the clamping device (5), characterized in that the clamping device (5) comprises bolts (6, 6') which are situated at the same height, are arranged at defined spacings in or on the tank wall (2), protrude inwards and onto which clamping rails (9, 9') can be plugged, or said clamping device comprises a circumferential flange (19), which is secured on the tank wall (2), and comprises clamping rails (9, 9') which can be screwed onto the flange (19), elastic sealing tapes (7, 8) being arranged running all the way around in each case between the clamping rails (9, 9') and the foil (4) and between the foil (4) and the inside (2') of the tank wall (2) or of the flange (19), and the clamping rails (9, 9') being locked on the bolts (6, 6') or the flange (19) under compressive stress.
- Flat-bottom tank according to Claim 1, characterized in that the clamping device (5) is arranged at a spacing of 100 to 500 mm from the tank bottom (1).
- Flat-bottom tank according to either of Claims 1 or 2, characterized in that the outer edge of the foil (4) ends flush with the clamping device (5).
- Flat-bottom tank according to one of Claims 1 to 3, characterized in that an additional foil (15) is arranged between the insert (3) and the tank bottom (1), said foil either being secured by means of the clamping device (5) or being welded above the tank bottom (1) to the foil (4) resting on the insert (3).
- Flat-bottom tank according to one of Claims 1 to 4, characterized in that the bolts (6, 6') are secured on a circumferential flange (19) which is firmly connected to the tank bottom and/or the tank wall (2).
- Flat-bottom tank according to one of Claims 1 to 5, characterized in that the bolts (6, 6') are secured directly in or on the tank wall (2).
- Flat-bottom tank according to one of Claims 1 to 6, characterized in that threaded holes (22) for receiving securing screws (23) in order to lock the clamping rails (9, 9') in position are arranged in the flange (19).
- Flat-bottom tank according to one of Claims 1 to 7, characterized in that the sealing tapes (7, 8) are coated on one or on both sides with a sealing compound.
- Flat-bottom tank according to one of Claims 1 to 8, characterized in that a sealant (17) is applied to the upper, circumferential edge, which is formed by the clamping rails (9, 9') and the glued-on foil (4) and by the sealing tapes (7, 8).
- Flat-bottom tank according to one of Claims 1 to 9, characterized in that the clamping rails (9) are designed such that they can be plugged together or plugged into one another, and an individual clamping rail (9) is dimensioned in its length in such a manner that it extends at least over two adjacent securing points (6, 6').
- Flat-bottom tank according to one of Claims 1 to 10, characterized in that the clamping rails (9) can be connected to one another by means of a coupling part.
- Flat-bottom tank according to one of Claims 1 to 11, characterized in that the clamping rails (9) consist of flat material and they are arranged with a defined spacing from one another, with a compensating rail (9') being exactly fitted in said spacing, the ends of said compensating rail overlapping the ends of the adjacent clamping rails (9), the securing holes of the adjacent clamping rails (9) being arranged coinciding with the securing holes of the compensating rail (9').
- Flat-bottom tank according to one of Claims 1 to 12, characterized in that a riser (18) is welded into the foil (4) resting on the insert (3), said riser being installed through the tank cover (16) and being connected to a measuring device for leakage monitoring.
- Flat-bottom tank according to one of Claims 1 to 13, characterized in that in the tank wall (2) below the clamping device (5), pipelines (13, 14) for leakage monitoring are installed, which project into the hollow space formed between the tank bottom (1) and the foil (4), or between the two foils (4, 15).
- Process for equipping a flat-bottom tank with a leakproofing lining consisting of at least one media-resistant plastic foil, said process comprising the following process steps:a) media-tight securing of a circumferential retaining means (6, 6', 19) on the outer limitation of the tank bottom (1) or with a defined, small spacing from the tank bottom (1) on the inside (2') of the tank wall (2), for receiving one or more clamping rails (9, 9'),b) placing of an insert (3) onto the tank bottom (1), said insert at least covering the tank bottom (1) and forming a hollow space,c) securing of a first, circumferential, elastic sealing tape (7) in the region of the retaining means (6, 6', 19), the sealing tape (7) fitting tightly against the inside of the retaining means (19) and/or the tank wall (2),d) preparation of at least one plastic foil (4) as a blank in the dimensions corresponding to the internal tank area to be lined,e) securing of the plastic foil (4) in a fold-free manner on the first sealing tape (7) in a manner ending flush with the upper edge of the sealing tape,f) glueing or placing of a second sealing tape (8), onto the plastic foil (4) in a manner coinciding with the first sealing tape (7),g) placing one or more clamping rails (9, 9') all the way around onto the retaining means (6, 6', 19) and securing of the clamping rails (9, 9') by means of screw or clamping connections (10, 11, 12, 23, 24) on the retaining means (6, 6', 19) with a uniformly defined clamping stress being set, as a result of which the foil (4) is pressed in a media-tight manner against the inside (2') of the tank wall (2) or of the retaining means (11), andh) installation of a leakage monitoring device.
- Process according to Claim 15, characterized in that a circumferential flange (19) or inwardly protruding bolts (6, 6') arranged at defined spacings are used as the retaining means.
- Process according to either of Claims 15 or 16, characterized in that a second plastic foil (15) is installed between the insert (3) forming the hollow space and the tank bottom (1), said plastic foil being connected directly below the clamping device (5) by welding to the first foil (4) resting on the insert (3).
- Process according to one of Claims 15 to 17, characterized in that a sealant (17) is applied to the upper side of the clamping device (5).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00124274A EP1083133B1 (en) | 1998-04-22 | 1999-04-14 | Flat-bottomed tank with leak-proof coating |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE29807285U DE29807285U1 (en) | 1998-04-22 | 1998-04-22 | Flat bottom tank with leak protection lining |
DE29807285U | 1998-04-22 | ||
PCT/EP1999/002517 WO1999054236A1 (en) | 1998-04-22 | 1999-04-14 | Flat-bottomed tank and method for fitting it with a leak-proof coating |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00124274A Division EP1083133B1 (en) | 1998-04-22 | 1999-04-14 | Flat-bottomed tank with leak-proof coating |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1073597A1 EP1073597A1 (en) | 2001-02-07 |
EP1073597B1 true EP1073597B1 (en) | 2002-06-26 |
Family
ID=8056132
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00124274A Expired - Lifetime EP1083133B1 (en) | 1998-04-22 | 1999-04-14 | Flat-bottomed tank with leak-proof coating |
EP99920668A Expired - Lifetime EP1073597B1 (en) | 1998-04-22 | 1999-04-14 | Flat-bottomed tank and method for fitting it with a leak-proof coating |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00124274A Expired - Lifetime EP1083133B1 (en) | 1998-04-22 | 1999-04-14 | Flat-bottomed tank with leak-proof coating |
Country Status (13)
Country | Link |
---|---|
US (1) | US6431387B2 (en) |
EP (2) | EP1083133B1 (en) |
AT (2) | ATE219746T1 (en) |
AU (1) | AU3816499A (en) |
CA (1) | CA2328162A1 (en) |
CZ (1) | CZ295544B6 (en) |
DE (3) | DE29807285U1 (en) |
DK (1) | DK1073597T3 (en) |
ES (1) | ES2178435T3 (en) |
HU (1) | HUP0103865A3 (en) |
NO (1) | NO318336B1 (en) |
PL (1) | PL343621A1 (en) |
WO (1) | WO1999054236A1 (en) |
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-
1999
- 1999-04-14 DK DK99920668T patent/DK1073597T3/en active
- 1999-04-14 AT AT00124274T patent/ATE219746T1/en not_active IP Right Cessation
- 1999-04-14 AU AU38164/99A patent/AU3816499A/en not_active Abandoned
- 1999-04-14 ES ES99920668T patent/ES2178435T3/en not_active Expired - Lifetime
- 1999-04-14 PL PL99343621A patent/PL343621A1/en unknown
- 1999-04-14 EP EP00124274A patent/EP1083133B1/en not_active Expired - Lifetime
- 1999-04-14 CA CA002328162A patent/CA2328162A1/en not_active Abandoned
- 1999-04-14 WO PCT/EP1999/002517 patent/WO1999054236A1/en active IP Right Grant
- 1999-04-14 AT AT99920668T patent/ATE219745T1/en not_active IP Right Cessation
- 1999-04-14 DE DE59901857T patent/DE59901857D1/en not_active Expired - Fee Related
- 1999-04-14 US US09/297,119 patent/US6431387B2/en not_active Expired - Fee Related
- 1999-04-14 EP EP99920668A patent/EP1073597B1/en not_active Expired - Lifetime
- 1999-04-14 CZ CZ20003893A patent/CZ295544B6/en not_active IP Right Cessation
- 1999-04-14 DE DE59901870T patent/DE59901870D1/en not_active Expired - Fee Related
- 1999-04-14 HU HU0103865A patent/HUP0103865A3/en unknown
-
2000
- 2000-10-06 NO NO20005064A patent/NO318336B1/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO1999054236A1 (en) | 1999-10-28 |
HUP0103865A2 (en) | 2002-03-28 |
US6431387B2 (en) | 2002-08-13 |
NO20005064L (en) | 2000-12-21 |
EP1083133A1 (en) | 2001-03-14 |
HUP0103865A3 (en) | 2002-04-29 |
PL343621A1 (en) | 2001-08-27 |
CZ20003893A3 (en) | 2001-12-12 |
AU3816499A (en) | 1999-11-08 |
DK1073597T3 (en) | 2002-10-14 |
NO20005064D0 (en) | 2000-10-06 |
EP1073597A1 (en) | 2001-02-07 |
NO318336B1 (en) | 2005-03-07 |
DE59901857D1 (en) | 2002-08-01 |
CA2328162A1 (en) | 1999-10-28 |
EP1083133B1 (en) | 2002-06-26 |
DE59901870D1 (en) | 2002-08-01 |
CZ295544B6 (en) | 2005-08-17 |
ATE219745T1 (en) | 2002-07-15 |
ES2178435T3 (en) | 2002-12-16 |
US20010025853A1 (en) | 2001-10-04 |
ATE219746T1 (en) | 2002-07-15 |
DE29807285U1 (en) | 1998-07-30 |
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