DK2397613T3

DK2397613T3 - Indbyggelig cistern with moisture and leakage protection

Info

Publication number: DK2397613T3
Application number: DK10166201.3T
Authority: DK
Inventors: Martin Dipl -Ing Krabbe
Original assignee: Tece Gmbh
Priority date: 2010-06-16
Filing date: 2010-06-16
Publication date: 2017-01-09
Also published as: EP2397613B1; EP3138968A1; EP3138968B1; DK3138968T3; EP2397613A1

Description

The invention relates to a built-in cistern for WC ceramics that can be installed in a recess of a wall comprising a water connection, an actuation mechanism, a connection tube between the built-in cistern and the WC ceramics as well as a moisture and leakage protection.

The built-in cistern serves for flushing sanitary ceramics, preferable WC ceramics. The built-in cistern is connected to water supply lines via a water connection. A valve for the water connection ensures that the built-in cistern handles a constant quantity of water. If the actuation mechanism is now actuated for flushing, an opening to the connection tube is released in the built-in cistern by a further valve. The water flows through this opening out of the built-in cistern for flushing into the WC ceramics. Water from the water connection then fills up again the built-in cistern. A moisture and leakage protection is provided in order to prevent water damages that could possibly develop due to condensation water or due to water leaking out of a leakage or the like on the built-in cistern or on the connected components. To this end, it can be provided, for example, that unintentionally leaking water is absorbed and discharged by the moisture and leakage protection.

Complementarily, an installation rack and a cover plate can also be provided. The installation rack serves for receiving the built-in cistern and the connected components in a wall or in a front wall. Moreover, a cover plate can be mounted for covering on the installation rack.

Applications of the invention are wet rooms, in particular sanitary areas in buildings that have been made of wood, for example wooden houses. Unlike living space made of concrete or stone, for wooden houses there is an increased risk that the building fabric of a wooden house is irreparably damaged by a water damage because of the susceptibility of wood to mold and rot.

In the Scandinavian countries, houses mainly consist of wood. Therefore there exist in this region, in particular in Norway, regulatory regulations and recommendations for avoiding water damages and their possible consequences, for example the technical regulations of the Planning and Building Act of 1997 (TEK).

In particular, TEK § 9-1 "Installation" and TEK § 9-5 "Sanitary installations" are relevant. There results therefrom the now described "pipe-in-pipe" system according to which all water pipes are to be laid "pipe-in-pipe". This being, an outer pipe serves as a protection pipe for an inner PEX pipe in which the water is conducted. This being, the matter is of a plastics pipe made of cross-linked polyethylene. In the event of a break of the inner pipe, the water comes into the protection pipe. This pipe conducts the water into an open accessible floor drain. The protection pipe prevents a discharge of the water into the building fabric and thus water damage. Simultaneously, the pipe break or the water damage can be detected. Countermeasures, for example the closing of a main line or of a distribution line, can be initiated. It is also common for this purpose to provide sensors and protection valves. A detailed description of the "pipe-inpipe-system" is to be found in the publication "ror-i-ror-systemer", published by the Building Research Institute of Norway in 2006 (ISBN 82-536-0925-6).

Moreover, these regulations are also applied for preventing water damage due to a built-in cistern. The Norwegian regulatory authority SINTF published the following recommendations thereto.

For the installation of built-in cisterns, the SINTF recommends, in the wet area of a sanitary area, for example of a bathroom, to first lay a sealing membrane, then to seal it and to tile. Only thereafter an additional separate front wall has to be built to insert the built-in cistern. The space in the front wall for the insertion of the flushing cistern has to be made accessible, for example by a removable cover plate. The dimensioning of this space should also make possible to easily maintain and replace the flushing cistern and the pipes.

Moreover, it is recommended to provide a slot-shaped opening in the front wall on the bottom side, opening through which potential water, caused by a leakage, can come out of the front wall into the bathroom. Similarly to the described "pipe-in-pipe" system, two functions are thus fulfilled to prevent water damage. On the one hand, the damage can be detected early; on the other hand, the water can drain off without damaging the building fabric. To this end, bathrooms according to Norwegian standards are equipped with a floor drain. For supporting the drain, the SINTF recommends to provide a slant in the front wall.

The Geberit company for example distributes such systems. A bevelled attachment is configured in the lower area of the recess of a front wall. The slant of the attachment leads to a small pipe that is formed in a tiled cover plate made of plasterboard, of wood or the like. In this way it is possible that water that possibly comes out of the space in the front wall can be drained through the small pipe in front of the cover plate. This water is then discharged through a floor drain in the bathroom.

Moreover, systems for the simultaneous mounting during the basic installation of a bathroom are also known. They have an installation rack that serves for receiving a built-in cistern, wherein it is closed apart from the front side. Connection pipes are provided on the front side between the WC ceramics and the flushing cistern or the sewage system. The front side can be covered with a cover plate made of plasterboard, of wood or of the like.

Such a system is available from the Bryne company. The installation rack is configured as a waterproof plastics crate that is open on the front and upper side. A trough is formed on the bottom side of the plastics crate. A small tube that discharges possible water coming out is to be found in the lateral lower front-sided area of this trough. A similar system is offered by the VINAR WS company. An installation rack made of wood is coated with a flexible waterproof membrane apart from the front and upper side. By folding the membrane, a trough is formed on the lower side of the installation rack. A small tube is provided on the trough in a known manner for discharging possible water coming out.

The on-site mounting work of the described systems is relatively high. For the first-mentioned systems, the bathroom is first to be completely tiled, and then a separate front wall that also has to be tiled has to be built. The higher material costs, the heavy investment of time and the increased installation costs related herewith are disadvantageous. The on-site mounting of the two last mentioned systems is also a multi-level costly process.

It has been found that water damage occurs more often in the flushing cistern itself than a leaking flushing cistern. Splash water then comes most of the time out of the inspection opening of the flushing cistern against the cover plate. For the mentioned systems, it is thus usually necessary after a water damage to replace the cover plate that is mainly made of wood or plasterboard. This again generates follow-up costs.

Moreover, the present water drains represent an unaesthetic interruption of the wall or of the front wall, in particular the drains of the two last-mentioned systems that are placed asymmetrically. With respect to function, these drains are not satisfactory either. Through the open drain, vermin or pests can come behind the cover plate and settle there. Furthermore, it is to bear in mind that moisture that accumulates in the space behind the cover plate either because of water damage or because of the normal use of the bathroom can result to odor production due to lacking sufficient ventilation.

At present, the systems that have been described do not gain any great market shares in Scandinavia including Norway. The reasons are possibly the described disadvantages, in particular the increased efforts relating to mounting and costs.

It is also possible that the systems do not totally convince possible buyers with regard to the reliability of the protection against water damages. Since the risk related to water damage can be an existential threat, the requirements for the acceptance of the potential buyer are relatively high. Therefore, a system against water damages should seem as robust and safe as possible.

The EP 1431467 describes a concealed cistern, whereby an insulating layer placed recessed on the outer side is placed on the rear wall as well as on the front wall in the water area of the flushing cistern for insulating against condensation water.

The US 2,651,052 describes a front wall flushing cistern with a back-ventilated insulation against condensation water.

The DE 4345049 A1 describes a sanitary installation system that is surrounded by a sound absorbing material at least in certain areas.

The US 2004/0064880 A1 describes a pressure-flushing cistern for increasing the water pressure in the sanitary ceramics, whereby a waterproof shell that surrounds the lower side of the cistern is provided. This document discloses the characteristics of the preamble of claim 1.

The DE-4345078 A1 describes an assembly block for mounting on the walls of constructional and domestic engineering devices with a wall fixation unit and a support unit for the device that are connected with each other for a structure-borne sound installation. Sound absorbing material can be placed between the wall fixation and the support unit.

Starting from the prior art mentioned in the introduction and from the disadvantages related herewith, the invention should provide a built-in cistern with a moisture and leakage protection for mounting into a wall that is particularly easily and quickly to be mounted on site by being robust, safe and aesthetic as well as not susceptible to pests or odor.

The aim of the invention is achieved by the subject matter of claim 1. Advantageous improvements result from the subclaims.

For the solution according to the invention, this aim is already achieved in that the built-in cistern has a cover plate, that the moisture and leakage protection is designed as a flexible watertight protective cover surrounding the built-in cistern and the connection tube, that on the bottom side of the protective cover a tubular appendix is formed which presents on the end thereof at least one bottom-side opening and that a rim is provided at said opening which is connectable to said cover plate in a sealing manner. Accordingly, the protective cover surrounds, when mounted, all the components of the built-in cistern and seals it against leakage but is simultaneously designed in such a way that an actuation of the flushing cistern is possible. The particular advantage of this solution is that it is upgradeable without extra modifications and without great efforts.

In the ideal case, the solution according to the invention meets the recommendations of the SINTF and the regulations according to TEK.

The solution according to the invention preferably comprises a built-in cistern designed for the installation in a recess of a wall. The built-in cistern is preferably placed in an installation rack. This installation rack is preferably designed as a rectangular frame made of metallic profiles, in particular of hollow profiles made of aluminum or steel. Other materials are also possible like, for example, plastics or even wood.

The installation rack comprises receiving means for receiving the components of the solution according to the invention and for the installation in the recess of the wall. Fastening eyes, threads as well as recesses for receiving components and the like can be provided as receiving means. It can make sense for the adjustment in the recess that the installation rack is designed adjustable in height, for example with a telescopic mechanism.

For covering the recess, a cover plate made of plasterboard that is preferably coated with tiles is preferably provided. It is also possible to make the plate of glass, plastics, stainless steel or the like. With respect to the regulations of the SINTF, it is particularly judicious to fix the cover plate so as to be removable and sealed over the recess of the wall. To this purpose, adequate seals and fixing means can be configured on the installation rack and/or the cover plate. Such fixing means can be, for example, screw connections, snap-lock connections, clamp connections or spring connections. The seals can be configured, for example, as rubber profiles, foam edges or the like. This being, the cover plate is preferably fixed in such a way that it is flush with the wall covering of the bathroom. The cover plate may also be plastered with the surrounding wall and then tiled.

The built-in cistern contains all the necessary connections and mechanisms for flushing a sanitary ceramics formed on the lower side. The water connection can in particular be configured for a PEX inner tube. For preventing the water damages mentioned in the introduction, particular safety devices can be formed on the water connection. They can comprise for example: safety valves, for example ball cocks, seals, for example compression fittings as well as safety hoses, for example reinforced armoured hoses with carbon fibers, nylon or stainless steel mesh etc.

The sanitary ceramics is preferably designed as WC ceramics. Flowever, bidet ceramics or other common sanitary devices are also possible.

It is provided to connect the built-in cistern to the sanitary ceramics with a connection tube, whereby the connection tube is preferably made of plastics. The built-in cistern comprises an actuation device that can preferably be mechanically controlled. The actuation device preferably comprises a button. It is also possible to design the actuation device as a non-contact device. The flushing can for example be electronically controlled by a remote control. However, in the standard case, the solution according to the invention comprises a common flushing cistern with a mechanical actuation device. A passage opening for a button of such an actuation device is preferably formed on the cover plate. A moisture and leakage protection is essential to the invention. This protection is preferably designed as a flexible waterproof protective cover that surrounds the built-in cistern and the connection tube. Such a protective cover is preferably made of a polyethylene foil with a polyethylene flocking. Materials or material combinations with similar properties are also possible.

The protective cover is preferably tight fitting and follows the shape of the flushing cistern and of the connection tube. Accordingly, it is possible that the protective cover has a tubular appendix that is provided for the connection tube. The protective cover has at least one opening that is preferably formed on the end of the described appendix and the connection tube is placed inside this opening. The opening itself is preferably placed in front of the cover plate behind the WC ceramics. Such an opening then serves for the discharge of water possibly coming out behind the WC ceramics. From there, the water can be discharged in a floor drain of the bathroom. A water damage is herewith detected early and can be remedied. Advantageously such a drain opening is designed non visible for the user. A rim that can be sealingly connected with the cover plate is provided on said opening. The rim can, for example, be coated with a tile covering on the cover plate. It is also possible to provide a removable tight connection, for example with sealing rings made of rubber, metal clamps or the like.

Perferably, protruding rim is provided on an opening of the protective cover for a button, which protruding rim can be mounted with a cover plate in a sealing manner, in particular with a tile covering of this cover plate.

In case no floor drain should be provided in the bathroom, it might also be possible to lead the water drain directly into the WC ceramics. It is preferably possible to close the bottom-side opening of the protective cover with a cuff around the connection tube. Water possibly coming out could then accumulate in this area. Furthermore, an opening that can be closed with a valve can be provided in the connection tube, opening through which the accumulated water arrives into the connection tube and finally discharges into the WC ceramics. This valve can be configured mechanically so that it opens only when water has accumulated in the protective cover on the outer side on the connection tube.

The valve can also be designed as an electrically controlled valve. To this purpose, a sensor is preferably provided in the area between the protective cover and the connection tube. This sensor opens the valve as soon as water has been detected in the protective cover. Since no puddle or the like draws the attention of the user to the water damage, it can also be appropriate that the sensor is connected with a warning device. For example, a beeper, a warning light or the like can be designed as warning device. Such a warning system can also be appropriate for the alternative device mentioned above with a floor drain.

The protective cover preferably comprises a further opening so that the protective cover can be slipped over the built-in cistern, whereby the opening is preferably situated on the side which is the upper side of the built-in cistern when mounted.

The solution according to the invention is preferably pre-installed. This relates to all possible combinations of the aforesaid elements of the invention. The flushing cistern and the connection tube are preferably equipped with the protective cover before the on-site mounting. To this purpose, the cover preferably has a further upper opening that makes possible to slip the protective cover over the built-in cistern and the connection tube similarly to a loose stocking. It is also possible to close said upper side opening. To this purpose, rubber bands can be provided in the rims of the opening. It is also possible to additionally provide, if necessary, a cover in the art of a hood in the area of the opening. The cover could be put over or slipped over or below said opening. Rubber bands can be provided in rims for fixing the cover. Velcro fasteners and snap locks as well as fastening rivets or the like are also possible. The design can also be such that the opening is tightly closed by means of the cover. It is possible to design this closure as a permanent closure, for example by bonding, welding, or also as a detachable closure, for example by a snap-on lock with flexible plastics profiles.

The steps of the preferred mounting procedure shall now be described. After the built-in cistern and the connection tube have been provided with the protective cover, both parts are inserted into the frame-shaped installation rack that has been described above. To this purpose, receiving means that have been described above are preferably formed on the installation rack. They preferably correspond to fixing means that are provided on the protective cover and can be formed, for example, as fastening eyes. The installation rack preferably comprises at least one cross brace that preferably has an opening for receiving the connection tube. The connection tube can protrude out of the opening with the hose-type part of the protective cover, namely beyond the plane covered by the frame-shaped installation rack. The protruding part of the connection tube thus serves to connecting to the WC ceramics. An additional junction connection tube can also still be provided for this purpose.

Similarly to the cross brace for receiving the connection tube, a cross brace can also be formed for a discharge pipe of the WC ceramics. The installation rack can be fixed in a corresponding recess of a wall through the fixing means that have been described.

Before connecting to the WC ceramics, a recess with the installation rack has to be provided with a cover plate. This cover plate preferably has corresponding passage openings for the connection tubes. The fixing of the cover plate can then be carried out in the manner described above. The installation of the built-in cistern is then terminated with the possible tiling of the cover plate. A preferred embodiment of the invention will be explained in detail with reference to the following drawings.

Fig. 1 shows a lateral sectional view of a built-in cistern according to the invention during mounting.

Fig. 2 shows a lateral sectional view of the embodiment according to fig. 1 after the mounting has been carried out.

Fig. 1 shows a built-in cistern 1 made of plastics and the components essentials for the installation. These elements comprise a mechanical actuation mechanism 13, a frame-shaped installation rack 2 made of steel profiles that surrounds the built-in cistern when mounted and a telescopic mechanism 8 for the adjustment in height, a connection tube 3 made of plastics, a protective cover 4 made of polyethylene foil with polypropylene flocking and a cover plate 5 made of plasterboard.

Furthermore, the following safety devices are placed on the water connection that is not represented in detail for a PEX inner tube: a ball cock, a compression fitting as well as a short armoured hose.

The protective cover 4 according to the invention surrounds the built-in cistern 1 with the connected connection tube 3 on the whole circumference and without interruption. On the side of the protective cover, not represented fixing means are designed as fixing eyes. Furthermore, the protective cover 4 has two openings 6, 7, designed in the art of sockets. The protective cover 4 and thus the built-in cistern 1 and the connection tube 3 are fixed to the corresponding receiving means of the installation rack 2 by means of not represented screws. The receiving means of the installation rack 2 are configured here as threads.

The connection tube 3 is configured curved and comprises a vertical and a horizontal part. The horizontal part of the connection tube is placed in a passage opening of a cross bar of the installation rack 3 that is not represented in detail.

The fixing means for fixing in a corresponding recess of a wall that is not represented are configured as eyes on the upper side and on the lower side of the installation rack 2. A cover plate 5 is detachably fixed by screws to the installation rack 2 and comprises some passage openings. Among others, a tubular appendix of the protecting cover 4 with the bottom-side opening 6 and the protruding rims of the protecting cover 4 in the area of an opening 7 for a button for a mechanical actuation mechanism 13 are guided through these passage openings in front of the covering wall 5.

Figure 2 shows the built-in cistern 1 after being completely mounted in installation position. A WC ceramics 10 is connected to the built-in cistern 1 by means of the junction connection tube 12 over the connection tube 3. Furthermore, a drainage pipe 11 is connected to a drain of the WC ceramics 10. The drainage pipe 11 is connected to a not represented drainage connection behind the cover plate 5 through a corresponding passage opening in the cover plate 5. The lower side opening 6 is slipped over the junction connection tube 12 behind the WC ceramics. The rims of the protective cover 4 in the area of the opening 7 for a button are plastered under a tile covering 9 of the cover plate 5. The cover plate 5 itself is flush with the tile covering 9 of a not represented wall.

In case water should now unintentionally come out of the built-in cistern 1 or of the connection tubes 3, 12, the waterproof protective cover 4 will collect this water. The protective cover 4 thus prevents that water comes out into the building fabric behind the cover plate 5. The collected water is then led through the protective cover 4 along the connection tubes 3, 12 to the bottom-side opening 6 of the protective cover 4. The water is discharged out of this opening 6 that is placed behind the WC ceramics. In figure 2, drops represent the flowing out of this water out of the opening 6. Water can now flow out into a not represented floor drain. In this way, water damage is avoided.

List of reference numerals 1 Built-in cistern 2 Installation rack 3 Protective cover 5 Cover plate 6 Bottom-side opening 7 Opening for a button 8 Telescopic mechanism 9 Tile covering 10 WC ceramics 11 Discharge pipe 12 Junction connection tube 13 Actuation mechanism

Claims

1. Indbyggelig cisterne (1) til en WC-keramik (10), og som kan indbygges i en udsparing i en væg bag ved en vægplade (5), og som omfatter en vandtilslutning, en aktiveringsindretning (13), et forbindelsesrør (3) mellem den indbyggelige cisterne (1) og WC-keramikken (10) samt en fugt- og lækagebeskyttelse, kendetegnet ved, at den indbyggelige cisterne omfatter en dækplade (5) til dækning af udsparingen i væggen, at fugt- og lækagebeskyttelsen er udformet som et bøjeligt vandtæt beskyttelsesdækorgan (4) , som omgiver den indbyggelige cisterne og forbindelsesrøret, at der på undersiden ved beskyt-telsesdækorganet er udformet en slangeagtig forsatsdel, som ved sin ende har mindst en ved undersiden anbragt åbning (6), og at åbningen har en kant, som på tætnende måde kan forbindes med dækpladen (5) .A built-in cistern (1) for a WC ceramic (10), which can be built into a recess in a wall behind a wall plate (5), comprising a water connection, an actuator (13), a connecting pipe (3) ) between the built-in cistern (1) and the WC ceramic (10), as well as a moisture and leak protection, characterized in that the built-in cistern comprises a cover plate (5) to cover the recess in the wall, that the moisture and leak protection is designed as a flexible waterproof protective cover (4) which surrounds the built-in cistern and connecting tube, a hose-like attachment portion having at least one opening (6) at its bottom end formed at the underside of the protective cover means and the opening having a edge, which can be sealingly connected to the cover plate (5).

2. Indbyggelig cisterne (1), kendetegnet ved, at beskyttelsesdækorganet (4) har mindst en yderligere åbning (7) til en aktiveringsindretning (13).The built-in cistern (1), characterized in that the protective cover (4) has at least one additional opening (7) for an actuator (13).

3. Indbyggelig cisterne (1) ifølge det foregående krav, kendetegnet ved, at der på beskyttelsesdækorganet (4) ved åbningen (7) er tildannet en fremspringende rand for en trykknap, hvilken rand kan dækkes ved hjælp af en dækplade (5). 4 Indbyggelig cisterne (1) ifølge et af de foregående krav, kendetegnet ved, at beskyttelsesdækorganet (4) har mindst en yderligere åbning, så at beskyttelsesdækorganet (4) kan stryges hen overden indbyggelige cisterne (1), og at åbningen fortrinsvis er anbragt på oversiden af den indbyggelige cisterne, når cisternen er indbygget.A built-in cistern (1) according to the preceding claim, characterized in that a protruding edge is formed on the protective cover (4) at the opening (7) for a pushbutton, which edge can be covered by a cover plate (5). The retractable cistern (1) according to one of the preceding claims, characterized in that the protective cover member (4) has at least one additional opening so that the protective cover member (4) can be swept across the built-in cistern (1) and preferably the opening is arranged on the upper side of the built-in cistern when the cistern is built-in.

5. Indbyggelig cisterne (1) ifølge et af de foregående krav, kendetegnet ved, at åbningen eller åbningerne i beskyttelsesdækorganet (4) kan lukkes ved hjælp af lukkeorganer.The built-in cistern (1) according to one of the preceding claims, characterized in that the opening or openings in the protective cover (4) can be closed by means of closing means.

6. Indbyggelig cisterne (1) ifølge et af de foregående krav, kendetegnet ved, at der på beskyttelsesdækorganet (4) er tildannet fastgørelsesorganer, ved hjælp af hvilke beskyttelsesdækorganet (4) kan fastgøres på et indbygningsstel (2).The built-in cistern (1) according to one of the preceding claims, characterized in that fastening means (4) are provided on the protective cover means, by means of which the protective cover means (4) can be fixed to a built-in frame (2).

7. Indbyggelig cisterne (1) ifølge det foregående krav, kendetegnet ved, at fastgørelsesorganerne er udformet som fastgørelsesøjer på siden af beskyttelsesdækorganet (4).Built-in cistern (1) according to the preceding claim, characterized in that the fastening means are formed as fastening eyes on the side of the protective cover (4).

8. Indbyggelig cisterne (1) ifølge et af de foregående krav, kendetegnet ved, at den indbyggelige cisterne er indrettet i et indbygningsstel.The built-in cistern (1) according to one of the preceding claims, characterized in that the built-in cistern is arranged in a built-in frame.

9. Indbyggelig cisterne (1) ifølge krav 8, kendetegnet ved, at den indbyggelige cisterne (1), forbindelsesrøret (3), beskyttelsesdækorganet (4) og et eventuelt omgivende indbygningsstel (2) er udformet som et i forvejen tildannet indbygningsmodul til indbygning.The built-in cistern (1) according to claim 8, characterized in that the built-in cistern (1), the connecting pipe (3), the protective cover means (4) and any surrounding built-in frame (2) are designed as a pre-built-in module for installation.

10. Indbyggelig cisterne (1) ifølge et af de forrige krav, kendetegnet ved, at den indbyggelige cisterne (1) omfatter en sikkerhedsventil, som kan lukkes ved hjælp af en føler, der er indbygget i beskyttelsesdækorganet (4).The built-in cistern (1) according to one of the preceding claims, characterized in that the built-in cistern (1) comprises a safety valve which can be closed by means of a sensor built into the protective cover means (4).

11. Indbyggelig cisterne (1) ifølge et af de forrige krav, kendetegnet ved, at dækpladen (5) løsbart kan fastgøres ved hjælp af fastgørelsesorganerne - og dette med henblik på en tætnende dækning af udsparingen i væggen, hvilke fastgørelsesorganer er tildannet på indbygningsstellet (2).The built-in cistern (1) according to one of the preceding claims, characterized in that the cover plate (5) can be releasably fastened by means of the fastening means - and this for a sealing cover of the recess in the wall, which fastening means are formed on the mounting frame ( 2).

12. Indbyggelig cisterne (1) ifølge et af kravene 1 til 11, kendetegnet ved, at den indbyggelige cisterne er indbygget i en væg bag ved en dækplade, idet cisternen omfatter nævnte dækplade til dækning af udsparingen i væggen og et indbygningsstel for den indbyggelige cisterne, og at randen af den ved undersiden værende åbning (6) på tæt måde er forbundet med dækpladen.The built-in cistern (1) according to one of claims 1 to 11, characterized in that the built-in cistern is built into a wall behind a cover plate, the cistern comprising said cover plate for covering the recess in the wall and a built-in frame for the built-in cistern. and that the rim of the opening (6) at the bottom is closely connected to the cover plate.