INSTALLATION MODULE

Technical field

The present invention relates to a method to provide shafts for ventilation ducts, water pipes, drain pipes and electrical wires in a multi-storey building, wherein installation modules are used for said shaft. The invention also relates to an installation module for use in such a method and to a multi-storey building compris- ing such an installation module.

Prior art

During building of multi-storey buildings shafts are built for ver- tical installations in the form of water pipes, drain pipes, electrical wires and ventilation ducts which are to be connected to each apartment. Usually the shafts are built at site by the building contractor while the installations are installed by staff from different installation contractors for each one of the above- mentioned installations. Horizontal installations between the shafts and connection points are installed at the site by staff from the respective installation contractor. Each installation contractor projects their own installations which are to be performed in the same shaft. In order to avoid problems during installation of the different installations a lot of co-operation is required between the installation contractors. Furthermore a large number of separate material transports are required in order to provide for example a kitchen which requires all the above-mentioned installations. Furthermore, installation of the installations is time consuming and complicated as they have to be performed in narrow spaces and in uncomfortable working positions. Furthermore, closing of shafts may not be performed until all installations are installed and the connections have been made between floors and to the connection points. Furthermore, special measures have to be taken in order to provide fire separation and sound isolation between apartments in the vertical direction.

Further problems with the prior art is that the shafts are often arranged at a large distance from the functions which are to be provided with mediums of different kinds, which give rise to horizontal installation of installations. The distribution box is for example often placed at the entrance while the stove, which is responsible for a large part of the electrical consumption in an apartment, often is placed at a large distance from the entrance.

The Swedish patent 330 074 describes a building element with sections of pipe systems and wire systems, being included in a building, for e.g. water, drain, outlet air, electricity, heat etc, wherein the connected pipe sections and wire sections of the elements essentially forms delivery conduits in the finished building and thus extends from one floor to another. Three different building elements are suggested to be used. A building element of a first sort is intended to extend from the bottom of the building up to approximately the middle of the bottom floor. On top of the first building element a building element of a sec- ond type is placed which extends from the middle of the bottom floor to the middle of the first floor. A number of building elements of the second type may be placed on top of each other to the desired height in the building. Uppermost in the building a building element of a third type is place which extends from the middle of the last floor up to the end of the last floor. Each building element comprises a frame structure in which the installations are fixedly arranged. After the building elements have been arranged in the building the installations in the shaft are connected to connection points outside the shaft. As the joint between the elements is approximately in the middle of a floor the problems of providing fire separation between the floors in the shaft are avoided, as means for the fire separation may be arranged in an element.

In the British patent GB 1 ,124,664 a device and a method is described for installing water and drain pipes in a multi-storey

building. In the corresponding way as in the above-described Swedish patent two different types of building elements are used. A first type of building element extends from the upper part of a floor to the lower part of the above-arranged floor. Means for fire separation may be arranged in the first type of building element. A second type of building element extends from the lower part of a floor to the upper part of a floor. In the British patent GB 1 ,066,556 a premanufactured module for water pipes and drain pipes is described. The module also comprises ventilation ducts and is arranged to extend along an entire floor. A number of modules are arranged on top of each other in order to create an entire shaft. On each floor horizontal installations are built from the shaft to each installation point.

In the US patent 3,694,973 a module for installations such as water, drain and ventilation is described. The module extends along an entire floor and comprises a hatch in its upper part in which connection to pipes from an above arranged module can be made.

Even if the solutions according to the prior art have facilitated the installation of installations such as pipes, ducts and wires for water, drain, ventilation and electricity, there are possibilities to further facilitate the arrangement of such installations.

Summary of the invention

An object of the present invention is to provide a method and a device to facilitate the arrangement of installations for water, drain, ventilation and/or electricity in a multi-storey building.

This object is provided with a device and a method according to the independent claims.

Further advantages with the invention are provided with the features of the dependent claims.

According to a first aspect of the present invention a method is provided for providing shafts with installations in a multi-storey building. The method comprises the step of providing at least two installation modules, each comprising a back side, a front side and at least a first shaft portion and a second shaft portion, each being defined by shaft walls extending from an upper end to a lower end. The installation module is adapted to be arranged with the front side facing a room in the multi-storey building and the installation module comprises installations of a first kind in the first shaft portion and installations of a second kind in the second shaft portion, which installations are chosen from the group comprising electrical wires, ventilation ducts and water and drain pipes. The method also comprises the steps of arranging the first installation module in a floor when the multistorey building is built, to arrange the second installation module on top of the first installation module in a higher floor on top of said floor when the multi-storey building is built, and to connect the installations in the first shaft portion of the first installation module and the second shaft portion of the first installation module with the installations in the first shaft portion of the second installation module and the second shaft portion of the second installation module, respectively.

With a method according to the invention the arrangement of shafts in multi-storey buildings is facilitated as the work on the building site for the multi-storey building is minimized. Through the use of installations modules according to the invention it is possible to finish the installation module in advance and to then transport it to the building site. By the installation module also comprising separate shaft portions for the different installations it is possible to build the shaft portions with the installations separately. This enables the installation module to be produced in an effective way as the arrangement of installations of the first kind in the first shaft portion can be done independently of the arrangement of installations of the second kind in the sec-

ond shaft portion. In the finished multi-storey building the shafts for the different installations are comprised of the accompanying shaft portions together. A further advantage with the method according to the invention is that the arrangement of installation modules may be done independently of the connection of the installations.

The installations in the first installation module may be connected to the installations in the second installation module us- ing coupling means. It is of course possible to connect the installations in other ways, but the use of coupling means is a fast way of providing the connection. The coupling means may be any one of a plurality of different variants such as, e.g., an elec- trofusion fitting, a clamp or a joint. The coupling means may be any type of fast coupling means which allows mechanical connection.

The method may also comprise the step of prefabricating the installation modules by providing at least two of the shaft por- tions with the installations, and to arrange the shaft portions on a common support device in order to provide one of the installation modules. As has already been mentioned above this means that the production of the installation module may be made in a more effective way as the installations in the different shaft por- tions may be done independently of each other. Compared to the prior art, where the installations are arranged in the shafts at the building site, much of the co-ordination work that is necessary during installation work according to the prior art, is avoided. With a method according to the invention the arrange- ment of the installations in the different shaft portions may be done simultaneously.

A method according to the invention may also comprise the step of arranging technical equipment in connection to at least one of the shaft portions on one of the installation modules in a prefab- rication step before the installation module is arranged in a floor

in a multi-storey building. With technical equipment is meant equipment which is intended to be connected to the installations in the shaft portions. By arranging technical equipment in connection to the front side of at least one of the shaft portions fur- ther effectivisation of the construction and time saving on the building site for the multi-storey building is enabled. Furthermore, the arrangement of the technical equipment may be made at the factory, wherein the arrangement of the technical equipment may be made under more controlled forms than what is possible on an ordinary building site.

If the technical equipment is arranged on the installation module in a prefabrication step the method may also comprise the step of connecting the technical equipment to the installations in the shaft portion in connection to which the technical equipment is arranged. This contributes to a further decrease of the work on the building site. Furthermore, by connecting the technical equipment in a prefabrication step testing of the technical equipment before the installation module is transported to the building site is enabled. By testing the technical equipment in advance the work of controlling the technical equipment at the building site is minimized. The only work that is required on the building site is to connect the installations in each installation module with the installations in the installation modules ar- ranged above and/or below the installation module and to test the whole system in the finished multi-storey building. The advantage of testing the installations in each installation module at a factory is that the risk for errors in the finished multi-storey building decreases. The connection may be made especially simple if the technical equipment is arranged on the front side of the shaft portions.

It is of course possible for the method to further comprise the prefabrication step to arrange furnishings which are not to be connected to the installations, on the front side of at least one of

the installation modules. This leads to a further decrease of the work at the building site.

The connection of the installations in the first installation module with the installations in the second installation module may be made above the lower end of the shaft walls in the second installation module. By the connection being made on that level the joint is relatively easily accessible for personnel which are to perform the connection. The joint may be arranged behind a hatch in one of the installation modules. The hatch may be hidden behind and be accessible through interiors which have been arranged on the front side of the installation module, as for example lower cupboards in a kitchen.

During the prefabrication the function of the installations, and possible technical equipment connected to these, may also be tested. In the case of electrical wires all electrical equipment may be tested at the factory. In the case of water pipes, heating, water, and sanitation fittings, and drains, may be tested for leaks. As the installations are tested at the factory a lot of work is avoided at the building site. The only things that have to be joined and tested at the building site are the joints between installations in different installation modules.

According to a second aspect of the present invention a method is provided for providing shafts with installations in a multistorey building. The method comprises the steps of providing at least a first and a second installation module of a first type and a first and a second installation module of a second type. Instal- lation modules of the first type comprises at least a first shaft portion, a back side and a front side, while the installation modules of the second type comprises at least a second shaft portion, a back side and a front side. The installation modules are adapted to be arranged with the front side facing a room in the multi-storey building, wherein each one of the shaft portions is defined by shaft walls extending from an upper end to a lower

end, and wherein installations of a first kind are arranged in the first shaft portion and installations of a second kind in the second shaft portion, which installations are chosen from the group comprising electrical wires, ventilation ducts and water and drain pipes. The method also comprises the steps of arranging the first installation module of the first type and the first installation module of the second type adjacent to each other in a floor and to arrange the second installation module of the first type on top of the first installation module of the first type, to arrange the second installation module of the second type on top of the first installation module of the second type, to connect the installations in the first shaft portion in the first installation module of the first type with the installations in the first shaft portion in the second installation module of the first type and to connect the installations in the second shaft portion in the first installation module of the second type with the installations in the second shaft portion in the second installation module of the second type.

In contrast to a method according to the first aspect of the present invention, a method according to the second aspect enables the shaft portions to be placed against different walls which are arranged in an angle to each other in the same time as the installation modules get sufficiently small outer dimen- sions to be possible to be transport to the building site without the need of special transports. Arrangement of installation modules in an angle to each other is for example of interest when building kitchens in an angle and desires to place for example the stove and equipment connected to drain pipes against dif- ferent walls.

The features that have been mentioned above in connection to the first aspect of the present invention may also be combined with a method according to the second aspect of the present in- vention with the same advantages as has been mentioned in

connection with the corresponding features combined with a method according to the first aspect of the invention.

According to a third aspect of the present invention an installa- tion module is provided which is arranged to extend essentially through at least one floor in the multi-storey building and which comprises a back side, a front side, at least a first shaft portion and a second shaft portion each being defined by shaft walls extending from an upper end to a lower end. The installation mod- ule is adapted to be arranged with the front side facing a room or a stairwell in the multi-storey building and wherein the installation module comprises installations of a first kind in the first shaft portion and installations of a second kind in the second shaft portion, which installations are chosen from the group comprising electrical wires, ventilation ducts and water and drain pipes.

With an installation module according to the invention it is possible to provide shafts in multi-storey buildings in a more simple way than with the prior art. By using an installation module according to the invention it is possible to provide the shafts with the installations by arranging at least two installation modules with one of the installation modules on top of the other, wherein the first shaft is comprised of the first shaft portion in the first installation module and the first shaft portion in the second installation module and wherein a second shaft is comprised of the second shaft portion in the first installation module and the second shaft portion in the second installation module. The only work that has to be performed at the building site in connection with the installations is connection of the installations in the two installation modules.

The installation modules may either be placed with one directly on top of the other or with a floor structure in between.

An installation module according to the invention may also comprise a support device, wherein the first shaft portion and the second shaft portion are arranged on the support device. The support device holds the at least two shaft portions together. It is possible to provide the installation module without a support device if the shaft portions are arranged adjacent to each other, but if the shaft portions are to be arranged at a distance from each other a support device is required holding the shaft portions together to an installation module.

The shaft portions may be arranged to extend above the upper edge of the support device. This is especially advantageous in the case that the wall modules are arranged with a floor structure in between, wherein the shaft portions which extends above the upper edge of the support device extends into the floor structure. In the corresponding way it is possible to let the shaft portions extend below the lower edge of the support device in order to extend down into the floor structure below the installation module. In this way the shaft walls may extend continuously through the multi-storey building and may function as means for fire separation.

The support device preferably comprises a back board and a front board between which the first shaft portion and the second shaft portion are arranged. With such a support device a stable installation module may be achieved. The support device may also function as means for fire separation.

The installation module may also comprise connection means which are arranged between the installations in each one of the shaft portions through the front shaft walls of the shaft portions so that technical equipment may be connected to the installations via the connection means. In the case that the installation module comprises a support device with a front board the con- nection means extends also through the front board. With such connection means at place the connection of technical equip-

merit to the installations in the shaft portions is facilitated. In the case of water pipes the connection means may be comprised of for example essentially horizontal water pipes from the essentially vertical water pipes in the shaft portions. With technical equipment is meant equipment that is to be connected to the installations. Examples on installations are for example equipment connected to drain pipes, a water, heating, or sanitation fitting, a water closet, a stove and a fan.

The installation module may also comprise technical equipment which is connected to the installations in the shaft portions via the connection means. By arranging the technical equipment on the installation module the work at the building site is facilitated as it is not necessary to install the technical equipment on the building site.

The technical equipment that is connected to the installations may be arranged in connection to the accompanying shaft portion. With such a placement of the technical equipment horizon- tal extension of the connection means is minimized. The cooker hood ventilator is for example preferably arranged on the front side of the shaft portion with ventilation ducts so that the horizontal extension of ventilation ducts is minimized. It may however be necessary to arrange some technical equipment at a distance from the accompanying shaft portion. This is also valid for the cooker hood ventilator which is arranged at a distance from the shaft portion with electrical wires as it is more cumbersome to install horizontal ventilation ducts than horizontal electrical wires.

The installations may extend from a point above the lower end of the shaft walls to a point above the upper end of the shaft walls. By the installations having such an extension the installations from a first installation module, being arranged below the second installation module, may extend up into the second installation module. Connection of the installations in the first in-

stallation module with the installations in the second installation module may then be made at the lower edge of the second installation module. In the case that a floor structure is arranged between the installation modules the installations may extend also through the floor structure.

The shaft walls that surround the shaft portions may comprise hatches in the vicinity of the lower end or the upper end so that connection of the installations in two vertically adjacent installa- tion modules may be provided in a simple way. The hatches cover openings in the shaft walls that also can be openings through a support device if present. This is applicable especially when the installations extend from a point above the lower end of the shaft walls to a point above the upper end of the shaft walls or from a point below the upper end of the shaft walls to a point below the lower end of the shaft walls.

The installation module may comprise finished surface layers on all surfaces which are arranged to be visible in a room in the multi-storey building. With such an installation module it is not necessary to perform any work at the building site in order to finish surface layers. Much less work is thereby required at the building site compared to construction according to the prior art.

The installation module may be arranged in such a way that one of the shaft portions comprises at least two ventilation ducts, wherein a connection means is arranged between one of the ventilation ducts through the front shaft wall of the shaft portions to the front side of the shaft portion. By arranging two ventilation ducts in one of the shaft portions it is possible to avoid technical equipment to be connected to the same ventilation duct in two installation modules arranged vertically adjacent, which lead to less sound transmission between the apartments.

The installation module may be arranged so that one of the shaft portions comprises electrical wires and an electrical central. By

arranging an electrical central in the shaft portion it is possible to make it easily accessible for inspection and services work. It is possible to arrange the electric central removable from the shaft portion.

There may be arranged storage spaces between the shaft portions. If the shaft portions in the installation module are placed at the distance from each other, space is created between the shaft portions, which space may be used as a storage space. In case a support device in the form of a back and a front board is used, openings are arranged are arranged in front board so that the space between the shaft portions becomes accessible.

The installation module according to the description above may be built to a complete kitchen by arranging kitchen interior on the installation module. In the corresponding way also other interior may be built on in order to provide other living environments/interiors, such as e.g. bathrooms.

The installation module may also comprise fire separation means arranged in the upper part or the lower part of at least one of the shafts. Such fire separation means, known per se, prevents fire from spreading through the shafts between floors in the multi-storey building.

The installation module may be arranged to extend through at least two floors in a multi-storey building. This is especially applicable to installation modules that are to be installed in stairwells.

In the following preferred embodiments of the invention will be described with reference to the appended drawings.

Short description of the drawings

Fig 1 shows an installation module according to a first embodiment of the present invention.

Fig 2 shows in cross-section a side view of two floors in a multistorey building with an installation module according to the embodiment in fig 1 in each floor.

Fig 3 shows in cross-section a side-view of two floors in a multistorey building with an installation module according to a second embodiment of the present invention.

Fig 4 illustrates schematically a method according to a third em- bodiment of the present invention.

Fig 5 shows an installation module according to a fourth embodiment of the present invention.

Fig 6 shows two installation modules according to the fourth embodiment arranged with one installation module on top of the other installation module.

Description of preferred embodiments

In the following description of preferred embodiments of the invention corresponding details will be denoted with the same reference numeral in the different drawings.

Figure 1 shows an installation module 1 according to a first embodiment of the present invention. In figure 1 a the installation module is shown from the front side while it is shown from the top in figure 1 b but without upper cupboards. The installation module 1 comprises a back side 2 which is adapted to be ar- ranged against a wall in a multi-storey building and a front side

3 which is adapted to be arranged facing a room in the multistorey building.

The installation module 1 comprises a first shaft portion 4 with installations of a first kind in the form of electrical wires 5, a second shaft portion 6 with installations of a second kind in the form of water pipe 7 and drain pipes 8, and a third shaft portion 9 with installations of a third kind in the form of ventilation ducts 10. The installation module 1 comprises also cupboards 1 1 ar- ranged on the front side of the installation module 1 and technical equipment in the form of equipment 12 connected to drain pipes 8, a stove 13 and a fan 14. The technical equipment and the cupboards 11 have been arranged on the installation module in a prefabrication step which has been performed at a factory. As an alternative should be noted that only parts of the technical equipment may be arranged on the installation module at a factory.

Each one of the shaft portions is delimited by shaft walls 15 which are intended to extend from floor to ceiling in a floor in the multi-storey building. The shaft portions 4, 6, 9, are arranged on a support device in the form of a back board 20 and a front board 34 which hold the installation module 1 together. As is shown in Fig 1 a part A of the shaft walls 15 extend a part above the front board 34 which is adapted to extend through the whole of or a part of the floor structure. The electrical wires 5, the water pipes 7, the drain pipes 8 and the ventilation ducts 10 extend above the shaft walls 15 of the installation module 1 so that they can extend up through a floor structure to another installation module 1 being arranged on a floor above the first installation module 1 , as will be evident from the description below. It is also possible to alternatively arrange the second installation module directly on top of the first installation module. The installations in the form of electrical wires 5, water pipes 7, drain pipes 8 and ventilation ducts 10 are arranged in the installation module in a prefabrication step which is performed at a factory.

This is also valid for the technical equipment in the form of equipment 12 connected to the drain pipes 8 and the fan 14. In addition to the arrangement of the installations and the technical equipment at a factory also testing of the installations and the technical equipment is performed at a factory. The work at the building site is thereby minimized to comprise connection of the installations in a first installation module with the installations in a second installation module positioned above or below the first installation module, and testing of the connected installations. This will be described in more detail with reference to fig 2. In the first shaft portion 4 there is also arranged an electrical central 33.

The space between the shaft portions between the back board 20 and the front board 34 may be used for storage spaces 30. Advantageously, an opening is arranged through the front board 34 for access to the storage spaces 30. Alternatively, cupboards which are arranged between the shaft portions may also have a larger depth than cupboards which are arranged on the front side of a shaft portion. In Fig 1 a is also shown how fire separation means 35 have been arranged at the upper ends of the installation modules.

Fig. 2 shows a side view in cross-section of two floors in a multi- storey building with a first installation module 1 in the first floor and a second installation module 16 in the second floor. During erection of the multi-storey building the first installation module 1 is arranged against a wall 17 in the first floor. In the first installation module 1 there is arranged a second shaft portion 6 with a water pipe 7 and a drain pipe 8. After the first installation module 1 has been arranged in the first floor a floor structure 18 is arranged above the first floor and a wall 19 in the second floor. A second installation module 16 is arranged against the wall 19 in the second floor. The water pipe 7 and the drain pipe 8 in the first installation module 1 extend up through the floor structure 18 up into the second installation module 16. The in-

stallations in the second installation module 16 ends in the corresponding way at a distance from the lower end of the shaft walls. A part A of the shaft walls 15 extends up through the floor structure 18. A first shaft is comprised of the first shaft portion 4 in the first installation module 1 and the first shaft portion in the second installation module 16. A second shaft is comprised of the second shaft portion 6 in the first installation module 1 and the second shaft portion in the second installation module 16. A third shaft is comprised of the third shaft portion 9 in the first installation module 1 and the third shaft portion in the second installation module 16. After the second installation module 16 has been arranged in the second floor the water pipe 7 and the drain pipe 8 in the first installation module 1 are connected to the water pipe 7 and the drain pipe 8 in the second installation module 16. The connection of the water pipes 7 and the drain pipes 8 is done using coupling means 25. At the lower edge of the shaft walls there is arranged hatches 26 for access via the lower cupboard to the joint between the installations. Both installation modules 1 , 16, comprises equipment 12 connected to the drain pipes 8 and a water, heating, and sanitation fitting 22, being connected to the drain pipe 8 and the water pipe 7, respectively, with connection means in the form of horizontal drain pipes 23 and horizontal water pipes 24 extending through the front wall of the shaft portion 6 and through the front board of the support device to the respective technical equipment. The equipment 12 that is connected to the drain pipes 8 and the heating, water, and sanitation fitting 22, have been arranged on the installation module during prefabrication of the installation module at a factory and have been arranged on the front side of the shaft portion 6 so that the horizontal water pipes 24 and the horizontal drain pipes 23 become as short as possible. As the equipment 12 that is connected to the drain pipes 8 and the heating, water, and sanitation fitting 22, is installed at a factory it is possible to test the function of the equipment 12 that is connected to the drain pipes 8 and the heating, water, and sanitation fitting 22, at the factory. Possible leaks may thereby be

taken care of already at the factory and the work at the building site may be minimized.

The embodiments that have been described above have been directed to a kitchen. However, the use of an installation module according to the present invention is not limited to kitchens.

Fig 3 shows in cross-section a side view of two floors in a multistorey building with a first installation module 1 and a second installation module 16 according to a second embodiment of the present invention in each floor. The installation modules 1 , 16 comprises a shaft portion 6 in which there is arranged water pipes 7 and drain pipes 8. At the front side 3 of the shaft portion 6 there is arranged a wall mounted lavatory 27 which is con- nected to the water pipes 7 and the drain pipe 8 with horizontal water pipes 24 and horizontal drain pipes 23. In the corresponding way, wall mounted equipment 12 that is connected to drain pipes 8 may be arranged on the shaft portion 6. The installation module also comprises a second shaft portion with ventilation ducts that are not being shown in the figure. In contrast to the installation modules that have been described above the water pipes 7 and the drain pipes 8 extend from a point below the lower edge of the shaft walls 15 to a point below the upper edge of the shaft walls 15. The connection of the installations is per- formed through hatches 26 on the front side of the shaft portions 6 at the upper edge of the shaft portions.

It is of course also possible to arrange an installation module 1 so that the installations extend from a point below the upper edge of the shaft walls to a point above the lower edge of the shaft walls. In this case hatches 26 are arranged at the lower edge of the shaft walls as well as at the upper edge of the shaft walls.

Figure 4 illustrates schematically a method according to a third embodiment of the present invention. In Fig 4 a kitchen is sche-

matically shown from above, which kitchen is arranged at an angle with a first shaft portion 4 with installations of a first kind in the form of electrical wires 5, a second shaft portion 6 with installations of a second kind in the form of water pipes 7 and drain pipes 8, and a third shaft portion 9 with installations of a third kind in the form of ventilation ducts 10. The third shaft portion 9 is arranged on a first installation module of a first type 31 which is arranged against a first wall 28. The first shaft portion 4 and the second shaft portion 6 are arranged on a first installa- tion module of a second type 32 which is arranged against a second wall 29 at an angle to the first wall 28. On a floor arranged above or below similar installation modules 31 , 32, are arranged, whose installations are connected in the corresponding way as has been described in connection to Fig 2 and Fig 3 above. By using two installation modules in this way it is possible to achieve a kitchen in an angle at the same time as the installation modules gets outer dimensions allowing transport from the factory to the building site without using special transports.

Fig 5 shows an installation module 1 according to a fourth embodiment of the present invention. The installation module 1 comprises a first shaft portion 4 with installations of a first kind in the form of electrical wires 5 and a second shaft portion 6 with installations of a second kind in the form of ventilation ducts 10. The installation module comprises a support device in the form of a back board 20 and a front board 34 which holds the shaft portions together. The installation module 1 according to this fourth embodiment is suitable for use in, e.g., stairwells.

Fig 6 shows schematically how a first installation module 1 and a second installation module 16 according to the embodiment in fig 5 have been arranged with the second installation module 16 on top of the first installation module 1 . Each installation module may be several floors in height.

The above-described embodiments of the invention may be varied in many ways without departing from the spirit and scope of the present invention which is limited only by the appended claims.

It is for example not necessary to arrange cupboards on the installation module in a prefabrication step but the cupboards may be arranged on the installation modules afterwards on the building site.