TWM627998U - Multiple Filter Assembly - Google Patents

Abstract

The present invention relates to a multiple filter assembly having an arrangement of filter assemblies, wherein each filter assembly has a modular arrangement of filter units spaced apart and arranged one above the other in a tube, wherein the The pipe is arranged in the underground shaft, wherein the conducting opening of the pipe is provided in the area of the filter unit, through which the water exchange with the soil layer surrounding the pipe can take place, so that the Groundwater circulation extending in the soil layer starting from one filter unit to another, wherein the conducting openings are designed such that the groundwater circulations of the adjacent filter assemblies interact with each other. Furthermore, the present invention relates to a filter assembly for the multiple filter assembly.

Description

Multiple Filter Assembly

The new model relates to a multiple filter assembly.

Such multiple filter assemblies have a plurality of individual filter assemblies, which are usually fixed discretely in the soil layer and operate independently of each other.

Such filter assemblies are commonly used to treat and purify groundwater. For this purpose, a plurality of filter units forming a filter assembly are arranged at intervals in the underground shaft on top of each other, wherein groundwater present in the ground can be purified by a single filter unit. The water can also be conveyed by the filter unit to the water treatment unit on the ground surface through a suitable pipe system with an associated pump.

In order to ensure error-free functioning of the individual filter units, and in particular to avoid short-circuiting of the fluid of the pumps assigned to the individual filter units, water-tight closures are provided between adjacent filter units in the hoistway. The water-tight closure, in the case of known filter assemblies, is constructed in the form of a gas-filled bag. Such an air bag forms an inflatable unit, wherein the air bag in the inflated state makes the gap between two adjacent filter units impermeable to water, forming a closure extending over the entire cross-section of the hoistway.

One disadvantage of the inflatable bag is that the installation of the inflatable bag is relatively complex. In addition, it is disadvantageous that the inflatable bag must be waited for a regular period of time, which entails further undesirable time and processing costs. Furthermore, such inflatable bags are relatively expensive.

It is also disadvantageous that the inflatable bag consists of a material that is not resistant to chemicals present in water. This means that the chemicals over time decompose the inflatable bag and the inflatable bag must be replaced.

Finally, a major disadvantage of filter assemblies with gas-filled packs is that the number of filter units is limited, since not an arbitrary number of pumps are provided in the respective ducts. This is particularly due to the fact that the pump has to be installed in the lower region of the delivery pipe in a complex manner.

The task of the novel is to provide a multiple filter assembly with high functionality.

The features of claim 1 are provided to solve this task. Advantageous embodiments of the invention and further solutions that are expedient are described in the dependent claims.

The present invention relates to a multiple filter assembly having an arrangement of filter assemblies. Each filter assembly has a modular arrangement of filter units spaced apart on top of each other in a tube arranged in a subterranean hoistway. Conductive openings of the pipes are provided in the region of the filter units, through which the water exchange with the soil layer surrounding the pipe can take place, resulting in a groundwater circulation extending in the soil layer, which is obtained from a filter. from the filter unit to another filter unit. The conducting openings are designed so that the groundwater circulations of adjacent filter assemblies interact with each other.

A major aspect of the present invention is that the individual filter assemblies of the multiple filter assembly do not operate independently of each other, but interact with each other through their groundwater circulation. The multiple filter assemblies thus constitute a synergistic arrangement of filter assemblies, which can also carry out complex filtration and purification processes of groundwater through the interaction of the filter assemblies.

Because the filter assembly of a multiple filter assembly extends over a large spatial area, groundwater can be purified within this spatial area, which achieves a significant efficiency increase relative to an isolated filter assembly.

According to an advantageous embodiment, the conducting openings of the filter assembly are designed such that the groundwater circulation of the filter assembly extends directionally in the direction of the adjacent filter assembly.

Expediently, the feedthrough openings each extend over a limited angular range of the tube for this purpose.

In this way, it is achieved that the groundwater circulation starting from one filter assembly extends in a targeted manner only in the direction of the adjacent filter assembly. In this case, the number of feed-through openings assigned to the filter unit corresponds to the number of adjacent filter assemblies. The angular extent of the feed-through openings is dimensioned in such a way that the groundwater circulation-directed flow of the filter assemblies is achieved only in the direction of the adjacent filter assemblies. Since this also applies symmetrically to all adjacent filter assemblies, it is ensured that the groundwater circulations of adjacent filter assemblies meet completely or almost completely, thereby resulting in a particularly efficient interaction of said groundwater circulations.

Advantageously, all the through openings of the filter assembly each extend over the same angular extent.

In order to arrange the filter units of the filter assembly one above the other at a vertically spaced distance, the same directional properties are obtained for the predetermined groundwater flow, that is to say for all filters of the filter assembly. The conducting openings of the cells are oriented in the direction of the adjacent filter assemblies.

Multiple filter assemblies can form different geometric arrangements of filter assemblies, wherein in particular linear or polygonal arrangements can be realized.

The filter assemblies used to form the multiple filter assemblies according to the invention are advantageously characterized by a modular construction.

The number and type of filter units provided to purify the groundwater present in the soil layer can be specifically matched to the soil layer properties of the soil layer, thereby achieving a high functionality of the filter assembly according to the invention.

The flexible modularization is achieved in particular by the fact that the pump can be inserted into the single delivery pipe from above, ie through the opening of the single delivery pipe which is exposed on the surface of the soil layer, thereby achieving a special The pump is easy to install. This eliminates the complicated underground installation of the pump, which limits the number of pumps that can be installed and consequently also the number of filter units in the filter assembly.

Said installation is advantageously easily achieved by the fact that the pump can be lowered in the delivery pipe into a defined position assigned to the filter unit.

The predetermined position can be formed by the deflection of the conveying pipe, or it is possible to have position fixing elements, such as tabs protruding from the inner wall of the conveying pipe, which define the predetermined position.

The delivery pipe, into which the pump can be inserted, is usually designed to discharge the water.

The delivery pipe then constitutes a pumping pipe through which the water is pumped upwards from the filter unit and in particular into a treatment station arranged above ground, namely the water treatment unit.

Advantageously, the lower inlet of the delivery pipe is located in the region of the filter unit, so that water can be pumped out from there.

Furthermore, a supply line for feeding water is constructed.

In this case, a pump is arranged on the ground, which transports the water, in particular after treatment in the treatment station, in a feed pipe down to the pump and thus to the filter unit, wherein it is also advantageous in this case The inlet is located in the area of the filter unit.

Due to the corresponding configuration of the delivery pipe, ie it generally has an upper inlet extending above the ground surface and a lower inlet in the region of the filter unit, the delivery pipe can optionally be used to transport the water The input to the filter unit or the discharge of water from the filter unit, wherein the settings can be changed at any time as required, enables flexible adaptation to different applications. In order to provide a supply line for feeding water, ie to provide a pump line, only one pump needs to be inserted into the supply line.

According to an advantageous embodiment, the filter units are arranged in cavities separated from one another in a watertight manner.

Expediently here, the delivery tubes are each assigned to the chambers.

The water-tight separation of the individual filter units ensures that each filter unit can function independently of the other filter units. Furthermore, fluid short-circuits between the filter units are also avoided in this manner.

According to a structurally advantageous design, the longitudinal axis of the conveying pipe extends parallel to the longitudinal axis of the pipe, wherein the longitudinal axis of the pipe and thus the longitudinal axis of the shaft extend in the vertical direction.

The delivery tube and said tube are advantageously constructed of stainless steel. The filter unit can be made of plastic glue or metal material. Advantageously, the filter unit is constructed in the form of a wire wound filter.

The water-impermeable wall section of the pipe is surrounded by a water-impermeable material, wherein in particular an intumescent material such as bentonite is suitable for the water-impermeable material. The water-permeable wall section of the pipe, which is formed by the filter unit, is surrounded by a water-permeable material, for example sand.

According to a first variant, the filter assembly has a peripheral delivery tube, ie a delivery tube extending outside the tube receiving the filter unit.

In this case, the conveying pipes run at a distance from each other and parallel to the pipes. Advantageously, the peripheral delivery tubes form a rotationally symmetrical arrangement with respect to said tubes.

In this variant, the chambers are advantageously water-tightly separated by dividing plates.

The dividing plate preferably consists of stainless steel and extends over the entire cross-section of the tube. Preferably, the dividing plate is welded to the inner wall of the tube.

Accordingly only one filter unit is located in the cavity separated by the dividing wall. Expediently, the peripheral feed pipes each extend into the pipes below the filter unit.

According to a second variant, the filter assembly has a concentric arrangement of delivery tubes extending inside the tubes, wherein the delivery tubes are arranged symmetrically with respect to the longitudinal axis, ie the axis of symmetry of the tubes.

Here, the upper end of the concentric conveying pipe extends above the surface of the formation in which the hoistway is provided.

Furthermore, the lower ends of the concentric conveying pipes are located at different height positions and are each assigned to the filter unit in this case.

The feed pipes are thus respectively assigned to the filter units, wherein the individual filter units are in turn separated in a water-tight manner. Advantageously, the inlet of the lower end of the delivery pipe is located sealingly above the filter unit.

According to an advantageous embodiment, the concentric conveying pipes are each supported in centering inserts fastened to the inner wall of the pipes.

In this case, a sealing cone is provided on the outer wall of the conveying tube, which sealing cone can be inserted into the central opening of the assigned centering insert.

The installation of the delivery tube inside the tube is thus easily achieved by inserting the delivery tube into the tube from above and then into the opening of the associated centering insert. In this case, the sealing cone on the delivery tube closes the opening in the core insert and thus ensures an automatic positional fixation of the delivery tube, without requiring additional work steps for this.

Furthermore, the centering insert and the associated sealing cone form a water-tight partition element, wherein the cavity with the filter unit is separated in a water-tight manner during passage through the partition element.

The installation of the filter assembly is done so that the tube is first positioned in the hoistway. In this case, the individual centering inserts are fastened as pre-installed units at different height levels on the inner wall of the tube.

In a first step, the delivery tube with the smallest outer diameter is installed in the tube, wherein the delivery tube is fastened with a sealing cone on the lowermost centering insert. The lower end of the first delivery tube extends out in said region.

The installation of a second delivery pipe is then performed, the outer diameter of the second delivery pipe being larger than the outer diameter of the first delivery pipe. The second feed tube surrounds the first feed tube, wherein the side walls of the feed tubes are arranged at a distance from each other. The second delivery tube is fixed in position on the second lowermost centering insert. The lower end of the second feed pipe extends out in this region. The other delivery pipes are installed in a corresponding manner, wherein usually the nth delivery pipe surrounds the (n-1)th delivery pipe and the nth delivery pipe is fixed in position on the nth centering insert, which is located in the nth centering insert. Above the (n-1)th centering insert.

1: Filter assembly

2: soil layer

3: Water treatment unit

4: Processing Station

5: Tube

5a: Conduction opening

6: Filter unit

7: Divider

8: Delivery pipe

8a, 8b, 8c: Delivery tube

9: Pump

10a, 10b: Centering inserts

10c, 10d: Centering inserts

11: Opening

12: Sealing cone

13: O-ring seal

14: Multiple Filter Assembly

15: Flow Line

16: Interaction area

I: Arrow

II: Arrow

Figure 1 is an embodiment of a first variant of a filter assembly of a multiple filter assembly according to the present invention.

Figure 2 is an embodiment of a second variant of the filter assembly of the multiple filter assembly according to the present invention.

Fig. 3a is a detailed illustration of the element according to Fig. 2 with a centering insert and an associated sealing cone on the delivery tube.

Figure 3b shows the arrangement according to Figure 3a with the sealing cone fastened to the centering insert.

Figure 4a is a longitudinal cross-sectional view of a first embodiment of a multiple filter assembly according to the present invention.

Figure 4b is a cross-sectional view of a first embodiment of a multiple filter assembly according to the present invention.

Figure 5 is a second embodiment of a multiple filter assembly according to the present invention.

FIG. 6 is a third embodiment of a multiple filter assembly according to the present invention.

FIG. 7 is a variant of the arrangement according to FIG. 6 .

FIG. 1 shows an embodiment of a first variant of a filter assembly 1 for the multiple filter assembly according to the invention according to FIGS. 4 to 7 . The filter assembly is integrated into an underground shaft, which is provided into the soil layer 2 and extends out over the surface of the soil layer 2 . The filter assembly 1 is assigned to a water treatment unit 3 arranged on the ground, typically a plurality of treatment stations 4 for treating groundwater present in the soil layer 2 .

The filter assembly 1 arranged in the hoistway has a cylindrical tube 5, the longitudinal axis of which extends in the vertical direction. Said tube 5 is advantageously composed of stainless steel.

A plurality of filter units 6 are arranged in the pipe 5 one above the other at a distance. The filter unit 6 may be constructed of plastic, steel or other metallic materials. In this case, the filter unit 6 is designed as a wire wound filter. In the filter unit 6 a physical treatment, eg an absorption process for filtering contaminants, takes place.

The tube 5 has a water-tight wall. In the region of the filter unit 6 , the wall has feedthrough openings 5 a. The water exchange between the surrounding soil layer 2 and the filter unit 6 takes place through the conducting openings 5a.

The water-impermeable wall section of the pipe 5 is surrounded by a water-impermeable material, in particular an intumescent material such as bentonite.

On the other hand, the conducting opening 5a of the pipe 5 assigned to the filter unit 6 is surrounded by a water-permeable material, such as sand and gravel. As a result, a water exchange between the filter unit 6 and the soil layer area is achieved, that is to say, Groundwater can be transported from the soil layer 2 to the filter unit 6 , or treated water can be transferred from the filter unit 6 into the soil layer 2 , wherein the direction of water flow is related to the water pressure in the filter unit 6 . An exemplary water cycle is shown in FIG. 1 by arrows I, II.

The individual filter units 6 are arranged individually in cavities separated from each other in a watertight manner. In order to form the chamber, a dividing plate 7 made of stainless steel is provided in the chamber, which is welded to the inner wall of the tube 5 .

As shown in FIG. 1 , the filter assembly 1 has an arrangement of delivery pipes 8 that are peripheral, ie extend outside the pipes 5 . The longitudinal axes of the delivery pipes 8 extend parallel to each other and parallel to the longitudinal axis of the pipes 5 . The conveying pipes 8 are arranged at a distance from each other and at a distance from the pipes 5 , wherein the conveying pipes 8 in particular form a rotationally symmetrical arrangement such that adjacent conveying pipes 8 are each arranged offset from one another at the same angle .

The upper end of the delivery pipe 8 extends out immediately above the surface of the soil layer 2 . The lower end of the delivery tube 8 extends into the tube 5 . Here, each feed line 8 is assigned to the filter unit 6 in each case. As shown in FIG. 1 , each delivery tube 8 extends into the tube 5 immediately below the associated filter unit 6 .

The pump 9 can be inserted into the delivery pipe 8 from above through the inlet of the delivery pipe. FIG. 1 shows an arrangement in which a pump 9 is inserted into two of the delivery pipes 8 . The pump 9 is held in a predetermined position in the lower part of the feed line 8 in the region of the associated filter unit 6 . The predetermined position can be determined by the deflection of the delivery pipe 8 . Alternatively, holding means, such as webs, for predetermining the desired position can be provided on the inner wall of the conveying tube 8 .

By inserting the pump 9 into the delivery pipe 8, the pumping line is formed in such a way that water is pumped upwards from the corresponding chamber with the filter unit 6 and from the pumping line to the water treatment unit 3, so that, in particular, there The treatment of the water is carried out in the form of chemical, physical or biological treatment.

The additional feed line 8 not inserted into the pump 9 forms the permeate line. The water is pumped from the water treatment unit 3 into the delivery pipe 8 and to the associated filter unit 6 by means of a pump arrangement on the ground.

FIG. 2 shows an embodiment of a second variant of the filter assembly 1 . Said filter assembly 1 is integrated in a shaft in the soil layer 2 and connected to a water treatment unit 3 above ground in the same way as the filter assembly 1 according to FIG. 1 .

The filter assembly 1 according to FIG. 2 also has a tube 5 in which a plurality of filter units 6 are arranged one above the other at a distance. The filter unit 6 in turn forms a water-permeable wall section of the pipe 5 which is surrounded on the underside of the pipe 5 with a water-permeable material, eg sand. The remaining wall sections of the tube 5 are impermeable to water and are accordingly surrounded on the outside of the tube 5 with a water-tight material, eg bentonite.

In the filter assembly 1 according to FIG. 2 , a concentric arrangement of delivery pipes 8 a , 8 b , 8 c is provided inside the pipe 5 , the longitudinal axis of which coincides with the longitudinal axis of the pipe 5 .

The respective delivery pipes 8 are supported in centering inserts 10 a , 10 b , 10 c , 10 d which are fastened to the inner wall of the pipes 5 . The centering inserts 10a, 10b, 10c, 10d in this case have the shape of a centering funnel.

3a and 3b show a detail view of the lowermost centering insert 10a with the configured innermost delivery tube 8 in which the pump 9 is supported in the lower region. Similar to the embodiment according to FIG. 1 , the pump 9 can be inserted into the delivery pipe 8 from above and then fixed in position at a defined position adjacent to the filter unit 6 arranged.

As can be seen in particular from FIG. 3 a , the central opening 11 is provided in the bottom region of the upwardly widening funnel of the centering insert 10 a .

Correspondingly, a sealing cone 12 is fastened on the outer side of the conveying tube 8 a, the outer contour of which is adapted to the circular contour of the opening 11 . The sealing cone 12 has an O-ring 13 as a sealing element.

The delivery tube 8a is installed by inserting the lower region of the delivery tube 8a into the opening 11 of the centering insert 10a until the sealing cone 12 rests on the edge area of the centering insert 10a that delimits the opening 11 and the position is fixed there. In particular, the sealing cone 12 seals off the opening 11 by means of an O-ring 13 . The delivery pipe 8 constitutes a pumping pipe by means of a pump 9 through which the water is pumped upwards from the lowermost filter unit 6 to the water treatment unit 3 .

The further feed pipes 8b, 8c have corresponding sealing cones 12 and are inserted with said sealing cones and thus fixed in position in the openings 11 of the assigned centering inserts 10b, 10c, 10d.

As shown in Figure 2, the lowermost centering insert 10a is located at the lowermost filter The filter unit above the unit 6 and said lowermost filter unit is water-tightly separated from the further filter units 6 .

The second feed tube 8b surrounds the first feed tube 8c and is supported with the sealing cone 12 on the second lowermost centering insert 10b. The lower end of the delivery pipe 8b is placed in the immediate vicinity of the second lowermost filter unit 6 .

A water-tight cavity is formed between the lowermost centering insert 10a and the second lowermost centering insert 10b, in which cavity only the second lowermost filter unit 6 is located. The supply of water into the filter unit 6 takes place via the second supply line 8b in that the water is pumped into this supply line 8 from above.

The second uppermost filter unit 6 is located in a water-tight cavity between the centering insert 10b and the centering insert 10c supporting the third delivery tube 8c. Said delivery pipe 8c extends immediately above the second uppermost filter unit 6 . A pump 9 is placed in the delivery pipe 8c, whereby this forms a pumping pipe through which water is pumped up from the filter unit 6 and delivered to the water treatment unit 3 .

Finally, the centering insert 10d forms with the upper edge region of the tube 5 an additional water-tight chamber in which the uppermost filter unit 6 is supported. Water is fed to this filter unit 6 from above.

The installation of the filter assembly 1 according to FIG. 2 is carried out such that, after the installation of the pipe 5 in the hoistway, first the delivery pipe 8a is installed, then the delivery pipe 8b and finally the delivery pipe 8c.

Figures 4a, 4b show a first embodiment of a multiple filter assembly 14 according to the present invention.

In this case, the multiple filter assembly 14 consists of a linear arrangement of the filter assemblies 1 according to FIG. 1 or FIG. 2 , wherein the filter assemblies 1 are constructed identically. In the embodiment according to FIGS. 4 a , 4 b , as also in the embodiments described below, the pipe 5 of the filter assembly 1 with a longitudinal axis extending in the vertical direction is placed in the soil layer 2 .

The filter assembly 1 is shown very schematically in Figures 4a, 4b. shown here Only two filter units 6 are integrated into the respective tube 5, however this is not mandatory. The filter assemblies 1 of the usual multiple filter assemblies 14 can also have different arrangements and numbers of filter units 6 .

The pipe 5 of the filter assembly 1 of the multiple filter assembly 14 according to FIGS. 4 a, 4 b has a conducting opening 5 a assigned to the filter unit 6 , which is configured such that for each filter assembly 1 groundwater circulation is maintained , the groundwater circulation extends in the direction of the groundwater circulation of the corresponding adjacent filter assembly. In this case, all the through openings 5a of the filter assembly 1 are constructed identically.

In the left and right filter assemblies 1 , each filter unit 6 is assigned a feed-through opening 5 a which is oriented in the direction of the central filter assembly 1 . The central filter assembly 1 has in each case two feedthrough openings 5a in the region of each filter unit 6 , wherein one feedthrough opening 5a is assigned to the left filter assembly 1 and the other feedthrough opening 5a is assigned to the right filter unit 6 . Component 1.

Each conduction opening 5a extends only over a limited angular range, which in this case is approximately 30°. As a result, at least one groundwater circuit is obtained for each filter assembly 1 , which groundwater circuit extends in the direction of the adjacent filter assembly 1 . Figures 4a, 4b show the flow lines 15 of the groundwater circulation.

As shown in Fig. 4a, the groundwater cycle is designed to transfer water from the upper filter unit 6 into the soil layer 2, while the lower filter unit 6 receives water from the soil layer 2, thereby achieving for each groundwater cycle from Flow line 15 extending up and down.

Since the groundwater circulation of each filter assembly 1 is oriented through the passage opening 5a in the direction of the respective adjacent filter assembly 1, the groundwater circulation is superimposed approximately in the middle between two adjacent filter assemblies 1, as in particular as shown in Figure 4a. Interactions between the groundwater circulation of adjacent filter assemblies 1 take place in this area, in particular the exchange of groundwater and the limitation of the extent of the groundwater circulation. The interaction area 16 is shown very strongly schematically in Fig. 4b.

FIG. 5 shows a cross-sectional view of a multiple filter assembly 14 having a hexagonal arrangement of filter assemblies 1 .

The structure of the filter assemblies 1 and the generation of the groundwater circulation of the individual filter assemblies 1 correspond to the embodiment according to FIGS. 4 a and 4 b . Corresponding to the embodiment according to FIGS. 4 a , 4 b , the flow lines 15 of the groundwater circulation and the interaction area 16 of the individual filter assemblies 1 are shown in FIG. 5 .

Each outer filter assembly 1 has the three closest adjacent elements, namely the central filter assembly 1 and the two closest outer filter assemblies 1 . In order to achieve groundwater circulation oriented towards the nearest adjacent element, the feed-through openings 5a of the outer filter assembly 1 each extend over an angular range of 120°, as can be seen from the flow lines 15 of the outer filter assembly 1 . . In contrast, the central filter assembly 1 is adjacent to all the outer filter assemblies 1, which are distributed over the full angular range of 360°. Correspondingly, the feed-through opening 5a of the central filter assembly 1 extends over the entire angular range of 360°.

The embodiment of the multiple filter assembly 14 according to FIG. 6 corresponds in its structure to that of the embodiment according to FIG. 5 .

The embodiment of FIG. 6 differs from the embodiment according to FIG. 5 only in that the flow direction 16 of the groundwater circulation of the central filter assembly 1 is reversed. The circulation of the groundwater thus takes place on the plane shown in FIG. 6 in such a way that the flow of the flow line 15 in the direction of the filter unit 6 of the central filter assembly 1 flows from the filter of the outer filter assembly 1 . Unit 6 starts, the central filter assembly receives groundwater.

FIG. 7 shows a cross-sectional view of a multiple filter assembly 14 having a square arrangement of filter assemblies 1 . The course of the flow lines 15 corresponds to the embodiment according to FIG. 6 .

Each outer filter assembly 1 has the three closest adjacent elements, namely the two closest outer filter assemblies 1 and the central filter assembly 1 towards which the groundwater circulation of the outer filter assemblies is directed Nearest Neighbor Orientation. Consequently, the feed-through openings 5a of the outer filter assembly 1 each extend over an angular range of 90°, as can be seen from the course of the flow lines 15 . Since the central filter assembly 1 is adjacent to all the outer filter assemblies 1, the feed-through openings 5a of said central filter assembly extend over the same angular extent of 360°.

1: Filter assembly

2: soil layer

3: Water treatment unit

4: Processing Station

5: Tube

5a: Conduction opening

6: Filter unit

7: Divider

8: Delivery pipe

9: Pump

I: Arrow

II: Arrow

Claims (22)

A multiple filter assembly having an arrangement of filter assemblies, wherein each filter assembly has a modular arrangement of filter units spaced apart on top of each other in a tube, wherein the tube is arranged in a In underground shafts, wherein a conducting opening of the pipe is provided in the region of the filter unit, through which a water exchange with the soil layer surrounding the pipe can take place, resulting in a An extended groundwater circuit, which starts from one filter unit to the other, wherein the conducting openings are designed such that the groundwater circuits of adjacent filter assemblies interact with each other. The multiple filter assembly of claim 1, wherein the conducting openings of the filter assembly are designed such that the groundwater circulation of the filter assembly extends directionally toward the adjacent filter assembly. The multiple filter assembly of claim 2, wherein the pass-through openings each extend over a limited angular extent of the tubes. The multiple filter assembly of claim 3, wherein the conducting openings of the filter assembly assigned to the respective filter units extend over the same angular range. The multiple filter assembly of claim 1, wherein the multiple filter assembly has a linear arrangement of filter assemblies. The multiple filter assembly of claim 1, wherein the multiple filter assembly has a polygonal arrangement of filter assemblies. A multiple filter assembly according to any one of claims 5 to 6, wherein a concentric arrangement of delivery tubes is provided inside the tube, or a peripheral delivery tube extending outside the tube is provided, wherein, The delivery pipe extends to the surface of the soil layer and has openings there through which a pump can be inserted. The multiple filter assembly of claim 7, wherein the pump is capable of being lowered in the delivery pipe into a prescribed position assigned to the filter unit. A multiple filter assembly according to claim 7, in which the delivery of a pump can be incorporated The tube is designed to drain water. The multiple filter assembly of claim 9, wherein the delivery pipe is provided for input of water. The multiple filter assembly of claim 1, wherein the filter units are arranged in cavities that are watertightly separated from each other. The multiple filter assembly according to claim 11, wherein one delivery tube is assigned to each cavity. The multiple filter assembly of claim 7, wherein the longitudinal axis of the delivery tube extends parallel to the longitudinal axis of the tube. The multiple filter assembly of claim 7, wherein the filter unit is constructed in the form of a wire wound filter. The multiple filter assembly of claim 7, wherein the peripheral delivery tubes form a rotationally symmetrical arrangement with respect to the tubes. The multiple filter assembly of claim 7, wherein the peripheral delivery tubes each extend into the tubes below the filter units. The multiple filter assembly of claim 11 wherein the cavities are water-tightly separated by divider plates. The multiple filter assembly of claim 7, wherein the concentric duct extends with its upper end above the surface of the soil layer in which the hoistway is provided. Multiple filter assembly according to claim 18, wherein the lower ends of the concentric conveying pipes are located at different height positions and are each assigned to a filter unit. A multiple filter assembly according to claim 18 or 19, wherein the concentric delivery tubes are each supported in centering inserts fixed to the inner wall of the tubes. The multiple filter assembly of claim 20, wherein a sealing cone is provided on the outer wall of the delivery tube, which sealing cone can be inserted into the central opening of the configured centering insert. The multiple filter assembly of claim 21, wherein the centering The insert and the associated sealing cone form a water-tight separating element by which the chamber with the filter unit is separated water-tight.

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