NZ775346B2 - System for the transmission of liquids in a rotatable building - Google Patents

Abstract

System (1) for transmitting liquids, such as clean water and/or wastewater, between a stationary core (2) and a rotatable story (3) of a building (4) in which said rotatable story (3) is arranged substantially circumferentially around said stationary core (2) and is rotatable with respect to said stationary core (2) about a vertical reference axis (5) that is the longitudinal axis of a section of the core (2) at which the story (3) is arranged, the system (1) comprising an annular buffer duct (6) extending circumferentially around the reference axis (5) of the stationary core (2) and having an annular lower duct portion (7) extending along the entire circumferential length of the buffer duct (6), and an upper duct portion (8) arranged from above in liquid communication with the lower duct portion (7) and slidingly engaging the lower duct portion (7) in at least one interface (9) extending along the entire circumferential length of the buffer duct (6),one of the lower duct portion (7) or upper duct portion (8) being fixed to the stationary core (2) and the other one of the lower duct portion (7) or upper duct portion (8) being fixed to the rotatable story (3) so that upon rotation of the rotatable story (3) with respect to the stationary core (2) about the reference axis (5), the upper and lower duct portions (8, 7) rotate relative to each other about the reference axis (5), the buffer duct (6) internally defining at least one annular transmission chamber (10) into which the liquid enters from above through one or more inlet ports (11) formed in the upper duct portion (8), and from which the liquid exits through one or more outlet ports (12) formed in the lower duct portion (7), the transmission chamber (10) being at atmospheric pressure, the system further comprising transmitted liquid level (15) sensor means for detecting a transmitted liquid level (15) of the liquid in the annular transmission chamber (10) and - a control system (16) connected to the transmitted liquid level (15) sensor means and adapted to control one or more inlet valves of the inlet ports (11) in dependency on signals from the transmitted liquid level (15) sensor means.

Description

System (1) for transmitting liquids, such as clean water and/or wastewater, between a stationary core (2) and a rotatable story (3) of a building (4) in which said rotatable story (3) is arranged substantially circumferentially around said nary core (2) and is rotatable with t to said nary core (2) about a vertical reference axis (5) that is the longitudinal axis of a section of the core (2) at which the story (3) is arranged, the system (1) comprising an annular buffer duct (6) extending circumferentially around the reference axis (5) of the stationary core (2) and having an annular lower duct portion (7) ing along the entire circumferential length of the buffer duct (6), and an upper duct portion (8) arranged from above in liquid communication with the lower duct portion (7) and slidingly engaging the lower duct portion (7) in at least one interface (9) extending along the entire circumferential length of the buffer duct e of the lower duct portion (7) or upper duct portion (8) being fixed to the stationary core (2) and the other one of the lower duct portion (7) or upper duct portion (8) being fixed to the rotatable story (3) so that upon rotation of the rotatable story (3) with respect to the stationary core (2) about the reference axis (5), the upper and lower duct portions (8, 7) rotate relative to each other about the reference axis (5), the buffer duct (6) ally defining at least one annular transmission chamber (10) into which the liquid enters from above through one or more inlet ports (11) formed in the upper duct portion (8), and from which the liquid exits through one or more outlet ports (12) formed in the lower duct portion (7), the transmission chamber (10) being at atmospheric pressure, the system further comprising transmitted liquid level (15) sensor means for ing a transmitted liquid level (15) of the liquid in the annular transmission chamber (10) and - a control system (16) connected to the transmitted liquid level (15) sensor means and d to control one or more inlet valves of the inlet ports (11) in dependency on signals from the transmitted liquid level (15) sensor means. 775346 B2 DESCRIPTION "SYSTEM FOR THE TRANSMISSION OF LIQUIDS IN A BLE BUILDING" FIELD OF THE INVENTION The present invention relates to a system for the transmission of liquids, e.g. clean water and wastewater, between a stationary core and a rotatable story of a building in which said ble story is formed circumferentially around and rotatable with respect to said stationary core. In the remainder of the present document the term "liquid" is to be construed as any liquid or semi-liquid substance requiring said transmission, except in the terms "liquid seal", "sealing liquid" and "flushing liquid", whose gs will be made clear in the description.

BACKGROUND OF THE INVENTION The feature of an apartment or hotel suite of ing a desirable view determines its salability and economic value. In addition, the y to change external appearance and shape can icantly increase the appeal of a residential and/or commercial (e.g. hotel or conference) building for potential clients and/or investors. Moreover, the ability to reposition individual stories of a tory building in order to purposely change their exposure (e.g. to sunlight or shadow), or their access to external infrastructure can be required for the purpose of energy saving or for meeting specific requirements in civil, industrial or military applications.

Known examples of rotatable ngs are observation towers and restaurants that are ntly single story, or top-floor only, rotatable installations which provide users with changeable views. Examples of such structures are shown e.g. in U83905166, U86742308, and U8841468.

Further examples of rotatable buildings are multistory apartment buildings or hotels with a selective 360° viewing capability and an individual or independent rotation of single stories. Examples of such buildings have been described e.g. in /205264A1 and U82006/0248808A1 .

The known multistory rotatable ngs have in common certain drawbacks and critical aspects contributing to high erection and operation costs, and precluding a fully le operation and acceptance thereof by investors. One of these critical aspects is to ensure the distribution and transmission of services (electricity, data, clean water, wastewater, etc.) between the stationary support structure and the rotatable stories. Another critical aspect is to ensure the structural reliability and maintenance of the rotatable support and rotating capability of the s over decades of service life of the ng.

While there are known ways to ensure a le transmission of electricity and other signals between elements in motion relative to each other (essentially via the technologies present in trains, telescopes, steering wheels, etc.), and while a co-pending patent application by the author describes an efficient way to ensure the aforementioned structural reliability, the present invention describes a reliable and efficient way to ensure the distribution and transmission of clean water and wastewater between elements in motion relative to each other.

Previous descriptions of such systems for transmitting liquids mention sealing elements at the interface between the fixed and rotatable portions, without however actually disclosing the structure and configuration of the sealing elements, or by defining the g elements as being fluid tight and fluid pressure resistant gaskets. Generally, the author of the present invention es that the failure to provide specific details about the nature of the sealing element is a major shortcoming because an appropriate g element is ve for the correct functioning of liquid transmission in the case of this very particular application. Specifically, gaskets are not d for the sealing of liquid transmission systems in the case of multiple stories independently evered off a core of e.g. 20 meters in diameter, for a number of s. Firstly, given the significant length of the interface (more than 60 metres at the perimeter of the core), fluid tight gaskets would te excessive friction resulting in unacceptably high energy consumption for imparting the rotation of the story with respect to the core. Secondly, very long gaskets may generate slip phenomena upon initial floor , resulting in the ng’s occupants uncomfortably feeling the change of speed. Thirdly, fluid tight s would be very complicated to maintain because they could not be replaced as a whole due to the stories’ e. They would need to be hed out to approximately twice their diameter, rolled vertically at the exterior of the building and fitted into place at the right height, none of which is a feasible . In the event of failure, damaged gasket sections would hence need to be removed and new gasket sections would need to be welded onto the residual gasket, thus making the latter of unequal quality throughout its circumference, ultimately curtailing its sealing ability in the long run. Moreover, such gasket s would result in unacceptably long downtimes, during which the building’s occupants would not benefit from continued liquid transmission.

W02007/148192 describes a toroidal pipe fixed to the stationary core and having a partial opening all the way around. This precludes the possibility of having a much more efficient vertically oriented stationary tube ed in and cooperating with a self-sealing brush of the type that will be described in connection with an embodiment of a clean water transmission system of the present invention.

W02007/148192 also describes a pipe fixed to the rotatable floor and sealingly connected to the opening in the toroidal stationary pipe. This des the possibility of arranging the seal or interface region distant from the point where s are exchanged n the stationary part and the rotatable part of the building. The closeness and direct contact of the sealing gasket and the transmitted liquid can corrode the gasket and jeopardize the gasket’s water-tightness.

As will be apparent from the following description of the present invention, it is much more ent for the seal or interface to be distant from the point of ge of the liquids and from the ged , preferably at a higher vertical position than the liquid level, thus significantly reducing the risk of leakage — which is a key feature of the present invention.

W02007/148192 indicates in the figures, e.g. Figure 13, that the sealing element is a , with all the aforementioned drawbacks of a gasket.

W02007/148192 also describes fixed and moving pipes sliding into one another, which may prove a very fragile setup, especially under extreme conditions such as earthquakes.

As will be apparent from the following description of the present invention, the elements in relative motion with respect to each other do not need to be configured in such a way that one of them is inside the other. /148192 also bes a solution with a ity of connection interfaces between the stationary and the rotating building parts, placed at predetermined positions for the exchange of liquids at only those predetermined positions. The floor would thus stop its rotation at positions enabling the connection fittings to t automatically for the exchange of liquids. Firstly, such automatically triggered connections necessarily require additional energy as well as high levels of maintenance. Secondly, if the floor’s rotation unexpectedly stops, e.g. due to a failure of the general rotation imparting device, e.g. electric motors, the connection fittings may not be in correspondence with one another, thus ting any liquid transmission. Such a design would likely not meet fire safety requirements, not to mention the comfort of the occupants.

W02007/148192 finally describes a system comprising flexible pipes connected to the core whose "exterior ends" (e.g. their nozzles) are moved by motors along a circumferential rail in order to bring them in correspondence with a connection point through which liquids can be exchanged. When a flexible pipe becomes completely stretched due to the rotation of the connection point, it disconnects from the rotating floor while other such flexible pipes connected to the same rotating floor ensure the continued y to exchange liquids. These constantly moving, connecting and disconnecting flexible pipe "exterior ends" require additional energy as well as high levels of nance, thus making them energetically inefficient and prone to failure.

Furthermore, such high-precision mechanisms require an impeccable oning of both the hardware and the underlying software e any failure, albeit momentary, may potentially result in leakages, spills or floods of any type of liquid (e.g. wastewater).

US710772582 describes a swivel joint apparatus for supplying utilities (gas, water) to a rotating ng rotatable about a central axis. The described clean water transmission system necessarily requires that the water be constantly under re, which puts undesired strain on the sealing elements, as described above. The first ment of US710772582, illustrated in s 1 to 8, describes horizontal exchanges of liquids via a plurality of chambers, while the second embodiment, illustrated in Figures 10 to 13 of US710772582, describes vertical exchanges of liquids via a plurality of chambers of a broadly r concept to that of the first embodiment. While the second embodiment seems more efficient because it reduces the risk of the liquids mixing following a e of the sealing element, both embodiments require gaskets for sealing the chambers, which is an inefficient solution for the previously stated reasons. In addition, US710772582 requires sensor chambers between each pair of adjacent liquid transmission chambers to detect possible leakages. The present invention describes a usage of sensors to prevent any leakage instead of detecting the leakage once it has ed, which is a more rational and efficient approach.

US710772582 describes a system wherein clean water and ater are transmitted very close to each other, possibly being only separated by a gasket. The ’s eventual failure due to friction may lead to unpleasant consequences for the building’s clean water consumers. The present ion describes a system wherein the elements transmitting clean water and wastewater are standalone devices, positioned in different locations with respect to the rotatable story, thus eliminating any risk that clean water and wastewater mix.

SCOPE AND GENERAL DESCRIPTION OF THE INVENTION The present invention describes significantly more efficient solutions for transmitting liquids from stationary building parts to rotatable building parts, and vice versa, than any solution described in the prior art.

It is an aim of the t invention to focus on prevention rather than on detection of leakage and system failures.

The present invention greatly reduces the risk that transmitted liquids may leak, let alone mix, thereby effectively rendering impossible such ence, except under catastrophic circumstances.

It is a key feature of the present invention to provide, between a clean water feeding line at the stationary building part and a clean water receiving line at the rotatable building part, a buffer space in communication with air under heric re, thereby maintaining the water at atmospheric pressure during transmission thereof from the stationary ng part to the rotatable ng part.

Similarly, between a wastewater feeding line at the ble building part and a ater receiving line at the stationary ng part, there is a buffer space in communication with air under heric pressure, y maintaining the transmitted wastewater at atmospheric pressure. Both for clean water and wastewater, or for other liquids that may need to be transmitted, the purpose of the buffer space at atmospheric air pressure is to be able to separate, e.g. by vertical distance, the transmitted liquid from an interface region between the stationary and the rotatable building parts, thus obviating the need of leak-tight and pressure resistant gaskets, reducing the frictional resistance, hence reducing the energy required to impart the rotation, and significantly reducing the risk of leakage.

With respect to clean water, some prior art solutions could only work if the water was kept constantly under pressure, although they did not state this requirement explicitly. The atmospheric air pressure buffer removes this constraint, thereby significantly reducing the risk of leakage as stated above. With respect to ater, the author of the present invention is not aware of any prior art providing a le and ent way to evacuate the so-called grey and black wastewaters — which is, instead, a r aim of the present inven?on.

These and other aspects and advantages of the present invention shall be made apparent from the accompanying figures and the description thereof, which illustrate embodiments of the invention and, together with the general description of the invention given above, as well as the detailed description of the embodiments given below, serve to explain the principles of the present invention.

BRIEF DESCRIPTION OF THE FIGURES In the accompanying figures, which show exemplary non-limiting embodiments of the inven?on: is a view from above of a buffer duct of a liquid transmission system of an embodiment of the invention; is a view from below of a buffer duct of a liquid transmission system of an embodiment of the invention; is a perspective view of a buffer duct of a liquid transmission system of an embodiment of the invention; is a vertical cross-section view of the buffer duct in Figure 3, in which the buffer duct has a substantially gular shape; FIGS. 48 and 4C are vertical cross-section views of the buffer duct in Figure 3, in which the buffer duct has alternative ; is a vertical cross-section view of the buffer duct in Figure 3, in which the upper duct portion is formed as an extension of the core; is a perspective view of a buffer duct of a liquid transmission system of a further embodiment of the invention; is a vertical cross-section view of the buffer duct in Figure 5, showing an interface region between a lower duct portion and an upper duct portion that opens only at a section currently engaged by the upper duct portion cal pipe); shows a detail of the buffer duct in Figure 6, in which the interface region between the lower duct portion and the upper duct portion is closed along the section that is not tly engaged by the upper duct portion; is a vertical cross-section view of a lateral-inferior part of the buffer duct in accordance with an embodiment; is a vertical cross-section view of the buffer duct in Figure 3 at a on of a liquid inlet port; is a schematic vertical cross-section view of the buffer duct in Figure 3 at a location of a liquid outlet port from which the liquid is conveyed to a pump, which can then supply it with a service pressure, e.g. in the case of household ng water; is a schematic vertical cross-section view of the buffer duct in Figure 3 at a location of a liquid outlet port in which the liquid is drained by y, e.g. household wastewater; is a schematic vertical cross-section view of the buffer duct in Figure 3 with a double transmission chamber, in which two liquids are drained separately by gravity, e.g. household "grey" and "black" wastewater; shows schematically a relative movement between rotatable and stationary buffer duct portions in a liquid transmission system between a nary core and a rotatable story of a building; shows cross-section views of brush sealed/covered/closed interface regions between upper and lower buffer duct ns in accordance with embodiments of the inven?on; shows section views of liquid sealed interface regions between upper and lower buffer duct portions in accordance with embodiments of the invention; A is a al cross-section view of a liquid sealed buffer duct in accordance with an embodiment of the invention; B is a perspective view of the buffer duct in Figure 16A; A is a vertical cross-section view of a liquid sealed buffer duct in accordance with a further embodiment of the invention; B is a vertical cross-section view of a liquid sealed buffer duct in accordance with a further embodiment of the invention; A is a schematic side view of a variable height buffer duct, preferably a wastewater buffer duct, arranged around a stationary core of a building, according to an exemplary embodiment of the invention; 8 is a schematic side view of a variable height buffer duct, ably a ater buffer duct, arranged around a stationary core of a building, according to a further embodiment of the invention; A is a vertical cross-section view of a buffer duct for the transmission of wastewater, in line with the embodiment shown in Figure 17A, positioned ly above a buffer duct for the transmission of clean water, in line with the embodiment shown in Figure 4D. The story from which wastewater is discharged via said wastewater buffer duct is positioned directly above the story to which clean water is ed via said clean water buffer duct; B is a vertical cross-section view of the wastewater and clean water buffer ducts shown in Figure 19A, in which the clean water buffer duct is at a greater radial distance from the core than is the wastewater buffer duct; 0 is a vertical section view of the ater and clean water buffer ducts shown in Figure 19A, in which the clean water buffer duct is at a smaller radial distance from the core than is the wastewater buffer duct; A is a vertical cross-section view of the wastewater and clean water buffer ducts shown in Figure 198, at one of the locally highest points of the wastewater transmission chamber; 8 is a vertical section view of the wastewater and clean water buffer ducts shown in Figure 198, at one of the locally lowest points of the wastewater transmission chamber; A shows, in a vertical cross-section view, the evacuation of sealing liquid from a liquid seal of a buffer duct by means of discharge from the , e.g. at a point of minimum height of the liquid seal trough bottom and near a point of maximum height of the transmission chamber bottom; B shows, in a vertical cross-section view, the evacuation of sealing liquid from a liquid seal of a buffer duct by means of an overflow, e.g. near or at a point of maximum height of the transmission chamber bottom; A shows a sealing liquid flow and discharge scheme along a section of a variable height liquid seal trough bottom and of a variable height transmission r bottom; 8 shows a sealing liquid flow and discharge scheme along a n of a variable height transmission chamber bottom in the presence of liquid seal overflow wall sections; shows, in a side view, the connection of a clean water buffer duct (of the type shown in Figure 3) between a rotatable story and a stationary core of a rotatable building, with the buffer duct arranged below the rotatable story; shows, in a side view, the tion of a wastewater buffer duct (of the type shown in Figure 3) between a rotatable story and a nary core of a rotatable building, with the buffer duct arranged below the rotatable story; shows, in a side view, the connection of a clean water buffer duct (of the type shown in Figure 3) between a rotatable story and a stationary core of a rotatable building, with the buffer duct ed above the rotatable story; shows, in a perspective view, the connection of a clean water buffer duct (of the type shown in Figure 5) between a rotatable story and a stationary core of a ble building, with the buffer duct arranged above the rotatable story; shows, in vertical cross-section views, exemplary embodiments of the ment/disengagement of dragging studs/members between buffer duct portions, for the purpose of allowing maintenance lifting of the rotatable story; is a schematic vertical cross-section view of an alignment device for aligning the upper and lower portions of a buffer duct in accordance with an embodiment; A is a vertical cross-section view of an embodiment of a buffer duct having a vent- to-core venting duct to maintain heric pressure, the vent being connected to the upper duct portion; 8 is a vertical section view of an embodiment of a buffer duct having a vent- to-core venting duct to maintain atmospheric pressure, the vent being connected to the lower duct portion; A is a al cross-section view of an embodiment of a buffer duct having a vent- to-facade g duct to maintain atmospheric pressure, the vent being connected to the upper duct portion; B is a vertical cross-section view of an embodiment of a buffer duct having a vent- to-facade venting duct to maintain atmospheric pressure, the vent being connected to the lower duct portion.

DETAILED DESCRIPTION OF THE ION With reference to the figures, reference numeral 1 denotes a system for transmitting liquids, e.g. clean water and wastewater, between a stationary core 2 and a rotatable story 3 of a building 4 in which said rotatable story 3 is arranged/extended substantially ferentialIy around said nary core 2 and rotatable with respect to said stationary core 2 about a vertical reference axis 5 that is the longitudinal axis of the core 2 or of a section of the core 2 at which the corresponding story 3 is arranged.

The system 1 comprises a ntially annular buffer duct 6 extending substantially ferentialIy around the reference axis 5 of the stationary core 2, preferably externally around the core 2, and having a substantially annular lower duct portion 7 (buffer channel ring) extending along the entire circumferential length of the buffer duct 6, and an upper duct portion 8 (inlet mouth) arranged from above in liquid communication with the lower duct portion 7 and slidingly engaging the lower duct portion 7, preferably in a dust proof manner, in at least one interface 9 extending along the entire circumferential length of the buffer duct 6.

One of the lower duct n 7 and upper duct portion 8 is fixed to the stationary core 2 and the other one of the lower duct n 7 and upper duct portion 8 is fixed to the rotatable story 3, so that upon rotation of the story 3 with respect to the core 2 about the reference axis 5, the upper and lower duct portions 8, 7 rotate relative to each other about the reference axis 5.

The buffer duct 6 internally s a substantially annular transmission chamber 10 into which the liquid enters from above through one or more inlet ports 11 formed in the upper duct portion 8, and from which the liquid exits through one or more outlet ports 12 formed in the lower duct portion 7.

The transmission r 10 is at atmospheric pressure, e.g. in communication with ambient air at atmospheric pressure through the interface/s 9 and/or through one or more g ducts 13. In this manner, the transmitted liquid is ed in the buffer duct 6 at ambient air pressure with the result that the interface/s 9 do/does not need to be configured as a gasket or as a continuous fluid tight and pressure resistant ring which would othenNise suffer wearing and te considerable friction resistance and stick- inp phenomena, ering the circumferential length of approximately 60 meters.

In accordance with an embodiment the system 1 comprises a control system 16. The main purpose of the control system 16 is to ensure a continuous supply of clean water, as needed, from the nary core 2 to the rotatable story 3 and the evacuation of wastewater from the rotatable story 3 to the stationary core 2.

Said control system 16 may be connected to sensor means for detecting the transmitted liquid level 15 and adapted to control one or more inlet valves of the inlet ports 11, and/or one or more outlet valves of the safety draining apertures 21, and/or one or more clean water pumps 23, and/or one or more sealing liquid rge valves 36, and/or one or more inlet valves of the sealing liquid replenishment system 38. The control system 16 may perform said control/s in dependency on signals from the transmitted liquid level 15 sensor means and/or based on other criteria, e.g. r liquid replenishment schedules, independent of the transmitted liquid level 15.

The transmitted liquid level 15 sensor means may comprise upper level s 17 (Figure 8) responsive to an exceeding of a predetermined upper limit level 14 by the transmitted liquid level 15, and/or lower level sensors 18 responsive to when the transmitted liquid level 15 drops below a predetermined lower limit level 19, and/or liquid pressure s and/or optical sensors and/or electrical resistance sensors, all adapted to detect values representative of the transmitted liquid level 15.

The control system 16 may be configured in such a way that the transmitted liquid level 15 inside the transmission chamber 10 is ined always below the interface/s 9. This prevents contact between the interface/s 9 and the transmitted liquid, thus eliminating the risk of mutual contamination, corrosion, and wear.

For the same purpose, the inlet port/s 11 and the outlet port/s 12 are arranged at a distance from the interface/s 9 and oriented in such a way that the transmitted liquid does not flow over or into the interface/s 9 es 6 and 9).

Alternatively, or in addition, safety overflow apertures 20 may be positioned in the lower duct portion 7 for automatically gravity-draining excess itted liquid, above the upper limit level 14 but still below the interface/s 9. Alternatively, or in addition, the outlet port/s 12 or additional safety ng apertures 21 in the bottom of the lower duct portion 7 may be provided with level- or pressure-controlled safety valves for automatically gravitydraining excess transmitted liquid above the upper limit level 14 but still below the interface/s 9 (Figure 8).

The l system 16 may be further ured in such a way that, in one or more selected buffer ducts 6 (chiefly for clean water transmission), the transmitted liquid level inside the transmission chamber 10 is maintained always at or above a predetermined lower limit level 19 e 8). This is one way to obviate the risk of running out of transmitted liquid, especially drinking water or firefighting water, necessary for the purpose of downstream pumping and pressurizing.

In the case of a fire emergency, flexible hoses fixed to the nary core 2 may be reeled out manually and brought onto the rotatable story 3, whose nt can be stopped for this purpose, to supply additional firefighting water.

Alternatively, or in addition, in the case of an emergency requiring a significant amount of clean water to be brought in a short time to the rotatable story 3, or in the case of any malfunctioning of the clean water ission system 1 (e.g. due to water contamination in the clean water transmission chamber 10), flexible hoses may be arranged to connect the stationary core 2 to the rotatable story 3, whose movement can be stopped for this purpose, thus ensuring a continued clean water supply to the clean water re accumulation tank/s 51. Such connection could be realized by plugging the flexible hoses’ nozzles into emergency ports positioned on the rotatable story 3 and/or the stationary core 2. The hoses may be fixed to one of the stationary core 2 or the rotatable story 3.

Alternatively they may be entirely loose and transportable, in which case they may be t up to the level of the ble story 3 during the emergency. The hoses and emergency water supply system are not illustrated in the figures.

In an ment (Figures 3, 4A, 4B, 4C, and 4D) the upper duct portion 8 forms an annular upper duct cover extending along the entire circumferential length of the buffer duct 6 and ng the lower duct portion 7 uously along two lateral interfaces 9, both extending along the entire circumferential length of the buffer duct 6. In this embodiment, during rotation of the story 3, the entire upper duct cover rotates with respect to the annular lower duct portion 7, while remaining in continuous concentric circumferential overlap and alignment with the lower duct portion 7.

In a further embodiment (Figures 5, 6 and 7) the lower duct portion 7 forms a nearly closed tubular channel except for a slot 22 extending along the entire circumferential length of the lower duct portion 7, and that may be formed in a top wall or in an upper side wall of the lower duct portion 7. The interface 9 is arranged at the slot 22 and the upper duct portion 8 forms a pipe extending preferably from above through the slot 22 and interface 9 into the annular ission chamber 10 defined inside the lower duct portion 7. In this embodiment, during rotation of the story 3, only the relatively small pipe moves with respect to the lower duct portion 7, along the slot 22, while remaining in continuous radial and vertical alignment with the lower duct portion 7.

Figures 3 to 7 show a variety of possible shapes for the upper and lower duct portions 8, 7. Such shapes are only rative and can be used in combination with one another.

Figure 10 shows an embodiment of the system 1 adapted for clean water supply to a rotatable story 3, in which the buffer duct 6 contains transmitted clean water at atmospheric pressure and the outlet port 12 is connected to a clean water pressure accumulation tank 51 with the interposition of a clean water pump 23, which may be controlled by the control system 16, for pumping the clean water from the buffer duct 6 into the clean water pressure accumulation tank 51 and for increasing the water pressure in the clean water pressure accumulation tank 51 to a desired value, e.g. 3 bar. The pressure accumulation tank 51 may comprise a hydraulic accumulator (not described in detail because per se well known in the art) for stabilizing the water pressure and compensating non-constant water usage in the rotatable story 3.

The clean water transmission system 1 may comprise more than one said clean water buffer duct 6 (for a same rotatable story) to enable the transmission to the rotatable story 3 of clean water at different temperatures.

Figure 11 shows an embodiment of the system 1 adapted for wastewater disposal from a rotatable story 3 to a stationary core 2, in which the buffer duct 6 contains itted wastewater at atmospheric pressure and the outlet port 12 is connected directly to a wastewater al duct of the core 2. Usually the wastewater will fall into the buffer duct 6, flow towards the outlet port/s 12 and immediately drain h the outlet port/s 12 into the wastewater al duct of the core 2 without accumulating inside the annular transmission chamber 10.

Figure 12 shows an embodiment of the system 1 adapted for a separate transmission of different kinds of liquid by means of a single modified buffer duct 6, e.g. for so-called "grey" water (i.e. wastewater generated from washing food, clothes and re, as well as from bathing, but not from toilets) and " water (i.e. wastewater ning feces, urine and flush water from flush toilets and toilet paper). In this embodiment the buffer duct 6 defines two or more separate annular ission chambers 10, 10’ separated from each other by one or more internal separation walls 24 formed in and by the lower duct portion 7, one or more separate inlet ports 11 for each one of the ission chambers 10, 10’ and one or more separate outlet ports 12 for each one of the transmission chambers 10, 10’.

If an at least dust proof separation is required between adjacent ission chambers , 10’ of the same buffer duct 6, one or more additional interfaces 9’ can be arranged n the al separation wall/s 24 and the upper duct portion 8. The additional interface/s 9’ can be made in a similar way as the interface/s 9.

Figure 13 schematically shows an embodiment in which the system 1 comprises, for one, more or each one of the rotatable stories 3: - one or more of said buffer ducts 6 g one or more supply ducts 25 for supplying a liquid, e.g. drinking water, firefighting water, from the stationary core 2 to the rotatable story 3, and - one or more of said buffer ducts 6 g one or more drain ducts 26 for discharging a liquid, e.g. wastewater, from the rotatable story 3 to the stationary core 2.

In the exemplary embodiment of Figure 13, the upper duct portion 8 of the supply duct 25 is stationary together with the core 2 and the lower duct portion 7 of the supply duct 25 rotates together with the story 3, whereas the upper duct portion 8 of the drain duct 26 rotates together with the story 3 and the lower duct n 7 of the drain duct 26 is stationary together with the core 2. ln embodiments, the interface/s 9 se/s a dust proof interface seal, e.g.: - a single sided or double sided brush seal 27 (Figures 14a, 14b and 14c), - a liquid seal 28 (Figures 15, 16A and 16B), - a labyrinth seal, which closes the interface/s 9 in an at least dust proof manner, preferably in a dust and odor proof , even more preferably in a dust, odor and water repellent manner, so as to make the buffer duct 6 of a substantially closed cross-section and to effectively separate and protect the liquid flowing through the annular transmission chamber 10 from the ambient, and vice versa.

One or more horizontal surfaces of the interface/s 9 may be d with damping layers (not illustrated in the figures) made of shock absorbing material such as some polymers, in order to protect the interface/s 9, as well as to contribute to the damping of the entire building 4, during extreme events such as earthquakes.

It should be understood that any alternative component, either known in the art or yet to be invented, of the interface/s 9, other than a ring seal, falls within the scope of the present invention. The term "ring seal" is to be construed as a solid meric mechanical gasket in the shape of a torus.

The liquid seal 28 comprises a trough 29 containing a g liquid (preferably water), and a lip, wall or sheet 30 projecting from above into the trough 29 and being immersed in the sealing liquid, wherein the trough 29 forms the lower duct portion 7 face of the interface 9, and the lip, wall or sheet 30 forms the upper duct portion 8 face of the interface 9, or vice versa.

In the liquid seal 28 the radial and vertical clearance between the lip, wall or sheet 30 and the internal walls and bottom of the trough 29 must be sufficient to ensure that during a destabilizing event such as an earthquake the lip, wall or sheet 30 will not come in contact with the internal walls and/or the bottom of the trough 29.

Moreover, the immersed portion of the lip, wall or sheet 30 must be sufficiently high to ensure immersion of the lip, wall or sheet 30 and, hence, its sealing ability, also when the entire rotatable story 3, or part of it, is lifted, e.g. for maintenance.

Figures 16A and 16B show an ary embodiment in which the lower duct portion 7 comprises auxiliary support struts 31 extending externally on both sides of the buffer duct 6 from a bottom part of the lower duct portion 7 to a laterally protruding side wall of the trough 29 of the liquid seal 28.

Figure 17A shows an exemplary embodiment in which the lower duct portion 7 is supported by a ledge ing substantially circumferentially from the stationary core 2.

Figure 17B shows an embodiment wherein the lower duct portion 7 is formed as an extension of the stationary core 2, wherein troughs are formed in said ion to form the transmission chamber 10 and both interface 9 liquid seal 28 troughs 29, and wherein sheaths or linings are placed in said troughs, i.e. the transmission chamber 10 and interface 9 liquid seal 28 troughs 29, to ensure eability. The troughs are thus coated with such sheaths or linings, which are made of an impermeable material, preferably high-density polyethylene (HDPE) or polytetrafluoroethylene (PTFE).

In an ment, the transmission chamber 10 bottom reaches its maximum height or locally highest point 32 in a region or section of the transmission chamber 10 close to where the liquid seal 28 trough 29 bottom reaches its point of minimum height or locally lowest point 40.

The liquid seal 28 may comprise a drainage system which allows the sealing liquid to flow out of the liquid seal 28, and a replenishing system 38 for g fresh sealing liquid into the liquid seal 28, thus ting the sealing liquid from becoming stagnant.

The sealing liquid replenishing system 38 comprises a replenishing duct system with one or more replenishing pumps and/or one or more replenishing valves, which may be lled by the control system 16 or via other means, for the purpose of replenishing the liquid seal 28 trough 29 with sealing liquid.

Figures 18A and 18B show embodiments in which all or a portion of the bottom of the annular transmission chamber 10 slopes downwards from one or more locally highest points 32 to one or more locally lowest points 33 where the outlet ports 12 are arranged, thereby driving the flow of liquid towards the outlet ports 12 by means of gravity and avoiding tion of . This is particularly advantageous for a possibly complete evacuation of the buffer duct 6 when used for wastewater disposal from the rotatable story 3 to the stationary core 2. The possibility of tely emptying the buffer duct 6 without leaving al pools of stagnant water or disinfectant solution is also of erable benefit for clean water transmission from the stationary core 2 to the ble story 3.

In an embodiment (Figure 18A) the bottom of the annular transmission chamber 10 forms only one highest point 32 and only one lowest point 33 which are preferably arranged at a pitch of approximately 180° with the advantage of needing only one outlet port 12 and also only one inlet port 11.

In alternative embodiments (Figure 18B) the bottom of the annular transmission chamber forms a plurality of y highest points 32 and locally lowest points 33 arranged alternately in succession along the entire circumferential length of the buffer duct 6, e.g. at a pitch of approximately 90°, 60°, 45°, 36°, 30°, or any of 360°/(2n) where n is a strictly positive r, with the age of a steeper sloping bottom without excessively increasing the total height of the buffer duct 6, but with the need of a plurality of outlet ports 12 corresponding to the number of locally lowest points 33. In the case of drinking water and firefighting water, there would also be a plurality of inlet ports 11 at least equal to the number of locally lowest points 33 and ed so that all outlet ports 12 can be supplied with liquid in each rotational position of the upper duct portion 8 with respect to the lower duct portion 7. This requirement does not apply to wastewater disposal from the rotatable story 3 to the stationary core 2.

In the case of wastewater, a plurality of outlet ports 12 has the advantage of enabling wastewater disposal from the ble story 3 to the stationary core 2 even in the event that one or more of the outlet ports 12 clog up.

It should be understood that, whichever liquid is transmitted, an embodiment in which the transmission chamber 10 bottom does not vary in height falls within the scope of the present invention.

In an embodiment the system 1 ses a flushing means adapted to convey a flushing liquid in the buffer duct 6 through one or more flushing ports 34 opening out into the transmission chamber 10 at a distance from the inlet port/s 11. While flushing and cleaning of the drain duct 26 can be also carried out by feeding a flushing liquid through the inlet port/s 11, one or more separate and independent flushing ports 34 can direct the flushing liquid flow in a more purposeful manner, may comprise spraying nozzles and/or flushing flow orientation adjustment means, or may be orientable or oriented to flush also at least part of the interface/s 9. The flushing means may se pumping means to pump the flushing liquid h the flushing port/s 34.

In embodiments es 19A to 20B), the lower portion 7 of the wastewater buffer duct 6 of a given rotatable story 3 and the upper portion 8 of the clean water buffer duct 6 of a rotatable story 3 positioned directly beneath said given rotatable story 3 are formed in a same stationary core 2 wall portion (e.g. a substantially radially outward protruding portion of the stationary core 2), which has the advantage of fying the structure of the system 1. The wastewater and clean water buffer ducts 6 may be positioned one above the other (Figure 19A) or, in order to ze the vertical space occupied by said system 1, may be positioned at different radial distances from the core 2 (Figures 19B and 190).

In line with this embodiment, and with the aforementioned embodiment of a variable height ater transmission r 10, the clean water buffer duct 6 may be oned at a r radial ce from the core 2 than the radial distance of the wastewater buffer duct 6 from the core 2. In order to further minimize the vertical space occupied by the system 1, and to minimize the materials required for the construction of the system 1, each clean water supply line to the clean water buffer duct 6 may be arranged to extend through the core 2 under a locally t point 32 of the wastewater transmission chamber 10 bottom (Figure 20A) extending above it. Each wastewater buffer duct 6 outlet port 12 is hence at a distance from, and not above, the clean water transmission chamber 10, thus further reducing the risk of the liquids mixing, even in the event of catastrophic occurrences (Figure 20B). The geometry of this embodiment is such that, in the event of an overflow of the wastewater transmission chamber 10 (e.g. due to the clogging up of one or more outlet ports 12), wastewater cannot enter the clean water transmission chamber 10 (Figures 20A and 20B).

In general, in order to further reduce the risk of the liquids mixing, all wastewater transmission chambers 10 and outlet ports 12 may be coated with impermeable material. lmpermeable material may also coat the surfaces surrounding the ater transmission chamber 10, in order to prevent overflown wastewater to seep through the structural material (e.g. concrete) into the clean water transmission chamber 10.

Figure 21A shows an embodiment in which the aforementioned liquid seal 28 drainage system functions by discharging the sealing liquid from the interface 9 liquid seal 28 into the annular transmission chamber 10 by means of one or more sealing liquid discharge ducts 35 connecting the bottom of the liquid seal 28 trough 29 to the transmission r 10, preferably above the upper limit level 14 to t backflow, and having one or more sealing liquid discharge valves 36 or plugs or shutters.

Figure 21B shows an embodiment in which the aforementioned liquid seal 28 ge system functions by discharging part of the sealing liquid from the interface 9 liquid seal 28 into the annular transmission chamber 10 by over-replenishment of g liquid into the liquid seal 28 trough 29 and overflow of excess sealing liquid above one or more internal overflow wall sections 37 of the trough 29 having a ated height which is lower than the external wall of the trough 29. Any embodiment other than the one in which there is only one overflow wall section 37 running along the entire internal wall of the liquid seal 28 trough 29 (wherein the g liquid’s overflow is hence circumferentially uniform along the internal wall of the trough 29) generates, during said overflow, a horizontal flow of sealing liquid within the liquid seal 28 trough 29, which advantageously further helps prevent the sealing liquid from stagnating. Said over- replenishment can occur by means of the sealing liquid replenishment system 38 described above.

In order to ensure that the sealing liquid fills the liquid seal 28 trough 29 to a minimum level, thus ensuring that the liquid seal 28 maintains its sealing ability, a control system (not illustrated in the figures) for the monitoring of sealing liquid levels similar to (or integrated in or connected to) the control system 16 bed above for lling transmitted liquid levels in the transmission chamber 10, may be configured to control the sealing liquid level and/or to replenish sealing liquid in the liquid seal 28 trough 29.

As described in connection with the flushing of the ission chamber 10, a similar flushing effect is performed also by the sealing liquid discharge into the transmission r 10 by the liquid seal 28 drainage system. Said flushing of the transmission chamber 10, via any of the mechanisms described above (flushing port/s 34, sealing liquid discharge duct/s 35 or internal overflow wall section/s 37), can be controlled ly, and/or by the control system 16, and/or by any other means. It can also be set to be performed regularly and/or automatically at ermined times, in order to ensure a constant minimal level of cleanliness, ally in the case of a wastewater transmission chamber 10.

As described in connection with the flushing of the transmission chamber 10, the liquid seal 28 trough 29 bottom may form a plurality of locally highest points 39 and locally lowest points 40 arranged alternately in succession along the entire circumferential length of the buffer duct 6, e.g. at a pitch of imately 90°, 60°, 45°, 36°, 30°, or any of 360°/(2n) where n is a strictly positive r, with the advantage of a steeper sloping bottom without excessively increasing the total height of the trough 29.

In the ce of the sealing liquid discharge duct/s 35 described above, multiple liquid seal 28 trough 29 bottom locally lowest points 40 may generate the need of a plurality of sealing liquid discharge ducts 35, corresponding to the number of locally lowest points 40.

Advantageously, each liquid seal 28 trough 29 bottom locally lowest point 40, and hence each sealing liquid rge duct 35, is arranged at or near the locally highest point/s 32 of the transmission chamber 10 bottom, to obtain a flow pattern as shown in Figure 22A.

It should be understood that, whether the sealing liquid discharge duct/s 35 is/are present or not, an embodiment in which the liquid seal 28 trough 29 bottom does not vary in height falls within the scope of the present invention.

Figure 22B tically shows the flow pattern of the combined liquid seal 28 drainage and transmission chamber 10 flushing by means of internal overflow wall sections 37.

Such system has the advantage of both changing the sealing liquid in the liquid seal 28 and flushing the wastewater transmission chamber 10, in one single step.

Figure 23 shows the connection of a clean water buffer duct 6 (of the type shown in Figure 3) between the ble story 3 and the stationary core 2 of the building 4, with the buffer ma?mbwmemmmme?my3lntemmmmm?mebwmdmummm7 (which must rotate together with the story 3) is supported by a substantially annular platform 41 fixed to or formed by the core 2, and made rotatable by means of rolling track means 42 or sliding means interposed between the platform 41 and the lower duct portion 7. The upper duct portion 8 (which must be stationary together with the core 2) is fixed to the core 2. In this manner, the entire weight of the buffer duct 6 is directly transmitted to the core 2. Dragging studs/members 43 connect the lower duct portion 7 to the story 3 so that they rotate er. One or more flexible pipes 44 connect the outlet ports 12 to the story 3 clean water system via the clean water pumps 23.

Figure 24 shows the connection of a wastewater buffer duct 6 (of the type shown in Figure 3) between the rotatable story 3 and the stationary core 2 of the building 4, with the buffer dm?Gwmma?mbwmemmmme?my3lntemmmmm?mebwmdmummm7 (which must remain nary together with the core 2) is fixed to the core 2. The upper duct portion 8 is rotatable together with the story 3 and can be vertically supported by means of an additional sustainment device 45 on the core 2 or on the lower duct n 7.

With such sustainment device 45 all or part of the weight of the buffer duct 6 is directly transmitted to the core 2. Dragging studs/members 43 connect the upper duct n 8 to the story 3 so that they rotate together. One or more flexible pipes 44 connect the story 3 wastewater system to the inlet ports 11.

In the embodiments shown in Figures 23 and 24, the flexible pipe/s 44 may run through, and/or be made to coincide with, one or more of the dragging members 43.

It should be understood that any embodiment of a wastewater buffer duct 6 lacking such additional sustainment device 45, and hence in which the entire weight of the upper duct n 8 is supported by the rotatable story 3, falls within the scope of the present inven?on.

It should also be understood that embodiments in which the supply duct 25 and/or the drain duct 26 comprise non-flexible pipes fall within the scope of the present invention.

Figures 25 and 26 show the connection of a clean water buffer duct 6 (of the types shown respectively in Figures 3 and 5) n the rotatable story 3 and the stationary core 2 of the building 4, with the buffer duct 6 arranged above the rotatable story 3. In this embodiment the lower duct portion 7 (which must rotate together with the story 3) is ly supported by and fixed to the story 3. The upper duct portion 8 (which must be stationary together with the core 2) is fixed to the core 2. This ment obviates the need of dragging members 43 and of rolling track means 42.

On the other hand, the system 1 may e and comprise onal compensation means for compensating a relative al displacement of the entire rotatable story 3, or part of it, with respect to the stationary core 2. Such vertical displacement may occur when the story 3 is lifted from its working position to a slightly higher maintenance position, e.g. during repair of elements, e.g. of the rolling track means 42, osed between the rotatable story 3 and the stationary core 2.

The additional compensation means may comprise one or more of: - first height adjustment means for adjusting the height of the upper duct portion 8 with respect to the core 2 (in case of a supply duct 25) or to the story 3 (in case of a drain duct - second height adjustment means for adjusting the height of the lower duct portion 7 with respect to the story 3 (in case of a supply duct 25) or to the core 2 (in case of a drain duct - the dragging studs/members 43 having a vertical sliding capability (Figures 27a and 27b) or a vertical telescoping or disengaging capability (Figure 27c) with respect to the lower or upper portion 7, 8 of the buffer duct 6 with which they are in contact, - a configuration of the interface/s 9 such as to allow for relative vertical movements n predetermined limits) between the upper and lower duct portions 8, 7, t substantially changing their functional relationship, e.g.: - a sufficiently vertically extended lip, wall or sheet 30 and a sufficiently deep liquid seal 28 trough 29 and a sufficiently high sealing liquid level of the liquid seal 28 (Figure 15), and/or - sufficiently long bilateral brush bristles engaging one another in a sufficiently vertically extended overlapping height (Figures 14a and 14b), and/or - the upper duct portion 8 forming a sufficiently ally protruding pipe extending sufficiently deep through the slot 22 (Figures 5, 6 and 7).

The sustainment device 45 or, more generally, an alignment device for aligning the lower and upper duct portions 7, 8 may comprise vertically engaging first rollers 46 and one or more first rolling tracks 47 with a rolling direction that is circumferential to the reference axis 5, and/or horizontally engaging second rollers 48 and one or more second rolling tracks 49 with a rolling direction that is also circumferential to the reference axis 5, wherein the first rollers 46 and the first rolling track/s 47 are connected/fixed the ones to the upper duct portion 8 and the others to the lower duct portion 7, or vice versa, and the second rollers 48 and the second rolling track/s 49 are connected/fixed the ones to the upper duct portion 8 and the others to the lower duct portion 7, or vice versa, as tically shown in Figure 28. The engagement of said rollers (46, 48) with said rolling tracks (47, 49) may not be exactly vertical and horizontal, and may be e.g. inclined to the vertical.

Such alignment means ensure the planned relative position between the upper and lower duct portions 8, 7, y preventing undesired disengagement of the interface/s 9, preventing leakage of red odors in case of wastewater disposal, and transmitting forces and gravitational loads between the upper and lower duct portions 8, 7.

While the atmospheric pressure within the annular transmission chamber 10 can be ensured through (an) air pervious interface/s 9 or through an air pressure monitoring and adjustment , e.g. controlled by the control system 16, for the same purpose one or more venting ducts 13 may be provided, which put the transmission chamber 10 in communication with a venting duct system of the nary core 2 (Figures 29A and 29B) or with ambient air at a facade 50 of the building 4 (Figures 30A and 30B). The venting duct system of the core 2 may be its main vent and waste riser. The system 1 may need and comprise shutters and/or pressure sation means for obviating undesired rization and depressurization due to wind direction and velocity.

In case the venting duct 13 is connected to the lower duct portion 7 (Figures 29B and 30B), the transmitted liquid upper limit level 14 is below the ection area between the venting duct 13 and the lower duct portion 7.

It is understood that, when the system 1 comprises two or more interfaces 9, the interfaces 9 may be at different elevations (Figure 30B), as long as all the interface 9 features hitherto described are maintained.

Although preferred embodiments of the invention have been described in detail, it is not the ion of the applicant to limit the scope of the invention to such particular embodiments, but to cover all cations and alternative constructions falling within the scope as defined by the claims.

Claims (14)

Claims

1. System (1) for transmitting liquids, such as clean water and/or wastewater, between a stationary core (2) and a rotatable story (3) of a building (4) in which said rotatable story (3) is arranged substantially circumferentially around said nary core 5 (2) and is rotatable with respect to said nary core (2) about a vertical reference axis (5) that is the longitudinal axis of a section of the core (2) at which the story (3) is arranged, the system (1) comprising an annular buffer duct (6) exte nding circumferentially around the reference axis (5) of the stationary core (2) and having 10 an annular lower duct portion (7) extending along the entire circumferential length of the buffer duct (6), and an upper duct portion (8) arranged from above in liquid communication with the lower duct portion (7) and slidingly engaging the lower duct portion (7) in at least one interface (9) extending along the entire circumferential length of the 15 buffer duct (6), one of the lower duct portion (7) or upper duct portion (8) being fixed to the stationary core (2) and the other one of the lower duct portion (7) or upper duct portion (8) being fixed to the ble story (3) so that upon rotation of the rotatable story (3) with respect to the nary core (2) about the reference axis 20 (5), the upper and lower duct portions (8, 7) rotate relative to each oth er about the reference axis (5), the buffer duct (6) internally defining at least one annular transmission chamber (10) into which the liquid enters from above through one or more inlet ports (11) formed in the upper duct portion (8), and from which the liquid exits through one or more outlet ports 25 (12) formed in the lower duct portion (7), the transmission chamber (10) being at atmospheric pressure, the system r comprising - transmitted liquid level (15) sensor means for detecting a transmitted liquid level (15) of the liquid in the annular ission chamber (10) and 30 - a control system (16) ted to the transmitted liquid level (15) sensor means and d to control one or more inlet valves of the inlet ports (11) in dependency on signals from the transmitted liquid level (15) sensor means.

2. System (1) according to claim 1, wherein the transmitted liquid level (15) 35 sensor means comprise one or more of: - upper level sensors (17) responsive to the transmitted liquid level (15) exceeding a predetermined upper limit level (14), - lower level sensors (18) responsive to the transmitted liquid level (15) dropping below a predetermined lower limit level (19), 5 - liquid pressure sensors and/or optical sensors and/or electrical resistance sensors, adapted to detect values entative of the transmitted liquid level (15).

3. System (1) according to claim 1 or claim 2, wherein the control system (16) is configured in such a way that the transmitted liquid level (15) inside the ission 10 chamber (10) is ined always below the interface/s (9).

4. System (1) according to any one of the preceding claims, wherein one of said one or more buffer ducts (6) constitutes a supply duct (25) from the stationary core (2) to the rotatable story (3) and the outlet port/s (12) of said supply duct (25) is/are connected 15 to one or more clean water re accumulation tanks (51) with the interposition of one or more clean water pumps (23) for pumping the clean water from the supply duct (25) into the clean water pressure accumulation tanks (51) and for increasing the water pressure in the clean water pressure accumulation tanks (51) to a desired value. 20

5. System (1) according to claim 4, wherein one or more of the clean water pressure lation tanks (51) comprise a hydraulic re accumulator for stabilizing the water pressure and compensating non nt water usage in the rotatable story (3). 25

6. System (1) according to any one of the preceding claims, wherein the interface/s (9) comprise/s a dust proof interface seal which closes the interface/s (9) so as to make the buffer duct (6) of a substantially closed cross-section.

7. System (1) according to claim 6, wherein the dust proof interface seal 30 comprises a liquid seal (28) having a trough (29) containing a sealing liquid, and a lip or wall or sheet (30) projecting from above into the trough (29) and being immersed in the sealing liquid, wherein the trough (29) forms the lower duct n (7) face of the interface (9) and the lip or wall or sheet (30) forms the upper duct portion (8) face of the interface (9), or vice versa.

8. System (1) according to claim 7, sing a drainage system which allows the g liquid to flow out of the liquid seal (28), and a replenishing system (38) for feeding sealing liquid into the liquid seal (28). 5

9. System (1) according to any one of the preceding claims, wherein at least a portion of a bottom of the annular transmission chamber (10) slopes downwards from one or more locally highest points (32) to one or more locally lowest points (33) where the outlet ports (12) are arranged, thereby driving the flow of liquid towards the outlet ports (12) by means of gravity.

10. System (1) according to any one of the preceding , wherein the lower portion (7) of the wastewater buffer duct (6) of a given rotatable story (3) and the upper portion (8) of the clean water buffer duct (6) of the rotatable story (3) positioned directly beneath said given rotatable story (3) are formed in a same stationary core (2) wall 15 portion.

11. System (1) according to claim 10, n the ater buffer duct (6) and the clean water buffer duct (6) are positioned at different radial distances from the stationary core (2).

12. System (1) according to claim 9 or claim 10, wherein the clean water buffer duct (6) is positioned at a greater radial distance from the stationary core (2) than the radial distance of the wastewater buffer duct (6) from the stationary core (2), and wherein a clean water supply line to the clean water buffer duct (6) is ed to extend through 25 the core (2) at the circumferential on of and below a locally highest point (32) of the wastewater transmission chamber (10) bottom.

13. System (1) ing to claim 6 or claim 7, wherein discharge of part of the sealing liquid from the liquid seal (28) into the transmission chamber (10) is lished 30 by over-replenishment of sealing liquid into the liquid seal (28) trough (29) and overflow of excess sealing liquid above one or more internal overflow wall sections (37) of the trough (29) having a calibrated height which is lower than an external wall of the trough (29).

14. System (1) according to claim 4, comprising a control system to control the 35 clean water pump/s (23) in dependency on signals from sensors, wherein the control system also allows manual l interventions. 8 M3?” ?i?g“3. T7 D *‘f 5—.— 20 {er‘ —--__ ., ?rm is 6A A B 5 F 2 “if Q 8 j/ '5 !ll?llllillil?lllllll llllii?lll li?uii?lll?l! ”in It“!!! kins- ‘ “‘ ‘7 i“ ‘ 4 15 0 A 33 8 ’ “x 9 z 6,26 B _A :::_:igiigiiji: FIG 21A F|G 21B FIG. ”228 1'1!‘$3 13f13 A FIG“ BOB