EP4417318A1 - Method and device for applying a mixture containing particulate material and binding agent to a surface - Google Patents

Abstract

A device (1) for applying a mixture containing particulate material and binding agent to a surface is disclosed. This device has a first pipe or hose line (2) leading to a first inlet connection (6) of a Y-pipe section (5), a first drive device for moving a material flow of particulate material through the first pipe or hose line (2), a feed line (7) for binding agent leading to a second inlet connection (9) of the Y-pipe section (5), a second drive device (8) for conveying binding agent through the feed line (7) and a second pipe or hose line (11) connected to an outlet connection (10) of the Y-pipe section (5) and having a discharge opening (12) at an end located away from the outlet connection (10). In the Y-pipe section (5), the feed line (7) opens into a conveying channel formed by the first pipe or hose line (2) and the second pipe or hose line (11). Furthermore, a method for applying a mixture containing particulate material and binding agent to a surface is disclosed, which can be carried out in particular with such a device.

Description

The present invention relates to a method for applying a mixture containing particulate material and binding agent to a surface. It also relates to a device for applying a mixture containing particulate material and binding agent to a surface. Finally, the invention relates to a Y-piece to be used in the device.

In the area of residential construction, particularly multi-story residential construction, it is often necessary to transport materials used for construction to the area where the apartments are being built. In addition to large-format building elements, this can also include particulate bulk material or similar material.

For example, housing construction using wood has recently come into focus, as the use of wood as a building material is more sustainable and climate-friendly than the concrete used in traditional housing construction. Sound insulation is a problem in housing construction using wood, especially in multi-story housing. Unlike building elements made of concrete, wood elements have a lower sound insulation effect. Nevertheless, It is necessary to comply with the sound insulation regulations, as laid down for German housing construction, for example in DIN 4109 (1), and to achieve appropriate sound insulation of the dividing components, in particular the floors. For this purpose, the floor of the apartment built using timber construction is provided with a sound insulation layer made of chippings mixed with a binding agent, in particular an elastic one. One challenge now is to spread the particulate material, in particular the chippings, homogeneously mixed with the binding agent on the apartment floors of the apartment and thus form the sound insulation layers. This challenge becomes greater the higher the apartment is located.

While particulate material, such as dry or moistened grit, can be conveyed over relatively high heights, for example driven by compressor-generated compressed air, this does not apply to a mixture of particulate material with binding agent. This is because along long conveying routes in hoses or pipes, excessive heat is generated by the friction in the system, which impairs the binding agent. This can cause the binding agent to bind prematurely and clog the line; in extreme cases, however, the binding agent, which is usually organic, can also carbonize, meaning that it is no longer usable at the end of a long conveying route. Accordingly, the particulate material, i.e. the grit, must be conveyed separately to the floor level, which can be done in batches with a crane or with a conveyor or a conveyor hose using compressor-generated compressed air, and the binding agent is poured onto the grit spread on the floor. However, it has been found that a layer of chippings applied to a thickness that is appropriate for sound insulation is not penetrated sufficiently homogeneously by the binding agent when the binding agent is poured on. Rather, the binding agent only penetrates over part of the vertical extent of the chippings layer, but not into the deeper areas. Accordingly, with such an approach, the layer must be formed in stages. by repeatedly spreading a layer of chippings and then pouring the binding agent over it. Such a procedure is time-consuming and laborious and also carries the risk of inhomogeneous sound insulation forming separate layers.

The object of the invention is to remedy this situation and to provide a method and a device with which the application of a homogeneously mixed layer of particulate material and binding agent is possible.

This object is achieved according to the invention initially by a method with the features of claim 1. Advantageous embodiments of the method according to the invention are specified in claims 2 to 6. A further solution to this object consists in a device for applying a mixture containing particulate material and binding agent to a surface with the features of claim 7. Advantageous further developments of such a device are specified in claims 8 to 13. In a further aspect, a Y-pipe section with the features of claim 14 is also specified that can be used in a device according to the invention. A further development of such a Y-pipe section is then finally specified in claim 15.

According to the invention, in a method for applying a mixture to a surface, which mixture contains particulate material, in particular grit, and binding agent, particulate material is conveyed in a material flow through a first pipe or hose to a feed point. In parallel, binding agent is conveyed through a feed line to the feed point. At the feed point, the binding agent is added to the material flow of the particulate material. The particulate material with the binding agent is conveyed further through a second pipe or hose to a discharge opening and then applied to the surface through the discharge opening. After the binding agent has been added, the particulate material is mixed with the binding agent, which is done in particular by generating non-laminar flows in the second pipe or hose connected to the feed point. Here, In particular, turbulence in the material flow is generated in order to achieve an intimate and ultimately homogeneous mixing of the particulate material with the binding agent.

By using this procedure, it is possible to ensure that even in the case of long conveying distances, a finished and homogeneously mixed mixture of particulate material and binding agent is obtained at the end of the conveying distance and can be spread over a surface as a finished mixture. In this way, corresponding layers of the thickness to be set can be applied in one operation, with a homogeneous distribution of particulate material and binding agent being achieved over the entire thickness. Because the binding agent is only added at the addition point, the distance over which the particulate material mixed with the binding agent is conveyed can be limited by adjusting the length of the second pipe or hose, so that the problems observed when conveying over long distances due to the heat generated by the resulting friction do not occur, and the binding agent is not damaged along the conveying distance in the second pipe or hose. On the other hand, a certain length will be set for the second pipe or hose line, along which the mixing of particulate material and binding agent is continued, so that at the end of the second pipe or hose line at the discharge opening a correspondingly homogeneously mixed mixture emerges for an optimal result of the applied material mixture.

It can advantageously be provided that the binding agent is added at the addition point with a flow direction that is transverse to a conveying direction of the material flow. Such a measure ensures that the initially laminar material flow of the particulate material is disturbed and non-linear flows are formed that allow the particulate material to be mixed with the binding agent. This can be conveyed further if, according to a further advantageous development, a pressurized conveying fluid, in particular compressed air, is introduced into the material flow at the addition point in addition to the binding agent. With this On the one hand, the conveying fluid can further accelerate the conveyed flow of binding agent, particularly when the conveying fluid under pressure is added to the material flow of the particulate material together with the binding agent. On the other hand, the formation of vortices or turbulence, i.e. the breaking up of a laminar material flow, can be promoted, particularly when the conveying fluid is introduced transversely to the conveying direction of the material flow, and thus a mixing of the particulate material with the binding agent can be further promoted and achieved.

In order to prevent, or at least reduce, dust formation, it can be provided that the particulate material is moistened, for example wetted with water, before it enters the first pipe or hose line, or during transport through this line.

The method according to the invention can be used in particular to apply such a mixture of particulate material with binding agent, which is applied to form a sound insulation layer on a floor of a multi-storey residential building, wherein the first pipe or hose line and the addition line are then advantageously led to the floor, the addition point is located on the floor and the second pipe or hose line is moved along the floor for a uniform application of the mixture on the floor.

In a further aspect, the invention provides a device for spreading a mixture on a surface, wherein the mixture contains particulate material, in particular grit, and binding agent. The device specified by this invention has a first pipe or hose line that leads to a first inlet connection of a Y-pipe section. It also has a first driving device for moving a material flow of particulate material through the first pipe or hose line. Such a driving device can be formed in particular by one or more compressed air compressors. With the compressed air generated by such a compressor or compressors, particulate material, such as grit, can be conveyed through the pipe or hose line, both horizontally and also in the vertical direction. By adjusting the pressure of the compressed air used for conveying on the one hand and the amount of air output on the other hand, a conveying speed or throughput of the conveyed particulate material can be adjusted in a comparatively simple manner. Another component of the device according to the invention is a feed line for binding agents, which leads to a second inlet connection of the Y-pipe section. A second driving device for conveying binding agents through the feed line is also part of the device. By means of the second driving device, binding agents, which are typically comparatively highly viscous, for example can have approximately the viscosity of honey, can be fed to the Y-pipe section via the feed line. The second driving device can be a feed pump, for example a screw pump. Another component of the device is a second pipe or hose line, which is connected at a first end to an outlet connection of the Y-pipe section and has a discharge opening at a second end. In the Y-pipe section, the metering line opens into a conveying channel formed by the first pipe or hose line and the second pipe or hose line.

With a device formed in this way, in particular the method described above can be carried out with the advantages set out and explained above.

In an advantageous further development, it can be provided that in the device according to the invention the Y-pipe section is designed as a pipe section with a main channel that continues the conveying channel between the first and second pipe or hose line, and with a feed pipe section on which the second input connection is arranged and which opens into the main channel. In particular, the Y-pipe section thus formed can be formed in one piece, preferably from a metal, in particular from steel, preferably stainless steel. The Y-pipe section is preferably dimensioned and designed in such a way that it can be transported to a site of use in a mobile manner, preferably carried by one person or two people. The input connections and the output connection are in particular designed for quick connection to the pipe or Hose lines or with the addition line, for example with corresponding flanges, to which corresponding pipe or hose ends can be flanged using flange clamps. It can be particularly advantageous for the feed pipe section to open transversely into the main channel, in particular at an angle of 90°. This type of design ensures that the binding agent fed in via the Y-pipe section is introduced transversely, for example perpendicularly, to the flow of the particulate material, thereby disrupting a laminar flow through the particulate material, leading to eddies or turbulence and thus promoting mixing of the binding agent with the particulate material.

A further promotion of the mixing can be achieved if structures are formed in the pipe section in an area located behind the mouth of the feed pipe section in terms of flow, which protrude into the main channel. Such structures in turn form barriers for the material flow, which additionally promote the formation of turbulence and thus a mixing of the supplied binding agent with the particulate material. Such structures can, for example, be formed by pins or bolts projecting radially inwards into the main channel from a wall of the pipe section, in particular by pairs of opposing pins or bolts arranged at different longitudinal positions of the main channel, which do not extend to the middle of the main channel, with preferably adjacent pairs of such pairs being rotated in their arrangement by an angle relative to a longitudinal axis of the main channel, for example by 90°. Such an arrangement further improves the mixing and turbulence of the material flow and thus a homogeneous mixing of the binding agent with the particulate material, in particular the chippings.

In the device according to the invention, it can also be advantageously provided that a fluid line for a conveying fluid, in particular a compressed air line, connected to a pressure generator is led to the Y-pipe section, in particular in the area of the second input connection is initially connected to the metering line. Via such a fluid line, in particular a compressed air line, a pressurized conveying fluid can be added, for example provided by a compressor, whereby this conveying fluid achieves a further acceleration of the flow of added binder and also an additional disturbance of the laminar flow of the particulate material and thus a turbulence and ultimately an improved mixing of binder and particulate material, in particular chippings.

Advantageously, in a device according to the invention, the first pipe or hose line can have a length of 15 to 120 m, in particular 30 to 100 m. This first pipe or hose line can be formed, for example, by concrete delivery hoses connected in series, which are known per se and are comparatively rigid but are nevertheless malleable, so that they can be guided, for example, along a scaffold, to a vertically elevated point at which the Y-pipe section is arranged and at which the binding agent guided via a corresponding hose line is then added.

Furthermore, it can be provided that the second pipe or hose line has a length of 5 to 25 m, in particular 10 to 20 m. A flexible line can preferably be used here, so that this line can be easily moved by one or two operators in order to reach different areas of the surface with the dispensing opening, on which the material mixture is to be applied as evenly as possible. The length of the second pipe or hose line is in particular to be limited to a length that does not generate such high heat due to the friction that occurs when transporting the mixture of particulate material and binding agent that the binding agent would be damaged as a result. In particular, when using the device according to the invention for applying a material mixture on the floor of an apartment, the first pipe or hose line can be led to the level of the floor of the apartment, the Y-pipe section can be placed on the floor of the apartment and the second pipe or hose line can be laid along the floor of the apartment in such a way that the material mixture flowing through the dispensing opening is directed accordingly. can be applied and distributed where it is to be applied, for example as a sound insulation layer in multi-story apartment buildings.

The first driving device can also be provided, for example, integrated in a conveying vehicle used to transport particulate material to a construction site, for example a tank or silo vehicle equipped with an on-board compressor or compressors that are designed to convey the particulate material into a hose or pipe that can be connected to an outlet of the tank or silo.

Figur 1

eine schematische Prinzipdarstellung einer erfindungsgemäßen Einrichtung zum Ausbringen eines partikuläres Material und Bindemittel enthaltenden Gemisches auf einer Fläche, mit der das erfindungsgemäße Verfahren durchgeführt werden kann; und

Figur 2

in zwei Ansichten a und b jeweils eine schematische Darstellung eines erfindungsgemäßen Y-Stücks das mit Vorteil Bestandteil einer erfindungsgemäßen Einrichtung zum Ausbringen eines partikuläres Material und Bindemittel enthaltenden Gemisches auf einer Fläche bilden kann.

Further advantages and features of the invention disclosed here emerge from the following description of possible embodiments based on the attached, sketchy figures. They show:

Figure 1

a schematic representation of the principle of a device according to the invention for applying a mixture containing particulate material and binding agent to a surface with which the method according to the invention can be carried out; and

Figure 2

in two views a and b each show a schematic representation of a Y-piece according to the invention which can advantageously form part of a device according to the invention for applying a mixture containing particulate material and binding agent to a surface.

In the following, possible embodiments of the invention are described and explained in more detail in exemplary embodiments, in particular with reference to the attached figures. The implementations of the invention specified in these exemplary embodiments are not intended to limit the general scope of the invention. However, special features and properties of the exemplary embodiments are nevertheless part of the invention and can in particular also be implemented in the invention independently of the combination shown in each case, and can therefore also be used individually to adapt the invention disclosed here to individual requirements. The figures are purely schematic sketches and are for illustrative purposes only. They are in no way to be understood as true to scale or as complete and final design specifications.

In the Figure 1 a schematic representation of a dispensing device 1 according to the invention is shown, with which a method according to the invention can be carried out. The dispensing device 1 initially comprises a first pipe or hose line 2 for conveying a particulate material, which can in particular be grit. This first pipe or hose line 2 is connected to a grit bunker 3 of a bunker and transport vehicle 4. The bunker and transport vehicle 4 has propellants (not shown in detail here) for driving the particulate material, in particular grit, to be conveyed through the first pipe or hose line 2. This can in particular be one or more compressors, with which compressed air for conveying the particulate material, in particular grit, can be introduced into the first pipe or hose line 2 together with this material. Instead of a chippings bunker 3 installed on a bunker and transport vehicle 4 as shown here, a fixed bunker of this type or a silo can alternatively be used, or the particulate material, in particular chippings, can be fed to the first pipe or hose line 2 via another feed line and then transported through this first pipe or hose line 2 by means of a driving device.

The first pipe or hose line 2 leads to a Y-pipe section 5, to which it is connected at a first input connection 6, for example and in particular via a flange connection. A further line, namely a metering line 7, is led to this Y-pipe section 5, through which binding agent can be conveyed in the direction of the Y-pipe section 5, driven by a binding agent pump 8. This metering line 7 is connected to the Y-pipe section 5 at a second input connection 9, here too for example via a flange connection.

The Y-pipe section 5, which is shown below using the Figure 2 will be described in more detail, has an outlet connection 10 to which a second pipe or hose line 11 is connected, here too for example and advantageously again via a flange connection. The second pipe or hose line 11 opens into a discharge opening 12 through which the particulate material, in particular chippings, fed via the first pipe or hose line 2 can be mixed with the binding agent from the Y-pipe section 5 with the binding agent fed via the feed line 7 and discharged as a material-binding agent mixture.

In the design variant shown here, in addition to the addition line 7 for the binding agent, a compressed air line 14 connected to a compressor 13 is connected to a third input connection 15, which can again be a flange connection, of the Y-pipe section 5. The two input connections, second input connection 9 and third input connection 15, are located together on a pipe socket 16, via which the binding agent, which is accelerated again with the supplied compressed air, can be added to the incoming particulate material, in particular the chippings.

In the Figure 2 In two illustrations 2a and 2b, the Y-pipe section 5 of a dispensing device 1 according to the invention is shown in more detail. Figure 2a shows a schematic side view, the Figure 2b a schematic front view of the Y-pipe section 5. The Y-pipe section 5 comprises a pipe section 17, which can be placed horizontally on a base via feet 18. In the pipe section 17, a main channel 21 is formed which runs along a longitudinal axis and which can be connected to the two pipe or hose lines 2, 11 via the connections, first input connection 6 and output connection 10 and which then supplements a conveying channel defined by the two pipe or hose lines 2, 11. The pipe socket 16 opens into this channel transversely, in particular perpendicularly, to the longitudinal direction of the main channel 21, so that binding agent fed via this pipe socket 16 and possibly accelerated with supplied compressed air is fed transversely to the flow of the particulate material, in particular chippings, can be introduced into the Y-pipe section 5 at this point. The inflow direction of the binding agent, which is directed transversely to the flow direction of the particulate material, already breaks a laminar flow of the particulate material and creates turbulence in the flowing material, which ensures that the particulate material is mixed with the added binding agent. This breaking of a laminar flow and the creation of turbulence and thus an improved mixing of particulate material and binding agent is further supported by bolts 19, 20 which are guided radially into the main channel 21 and which are each guided in pairs opposite one another and not as far as the middle of the main channel 21, the pairs of bolts 19 and the pairs of bolts 20 each being arranged rotated by 90° around the longitudinal axis of the main channel 21.

With the application device 1 shown in the figures, a mixture of particulate material, in particular grit, and binding agent can now be applied to a surface in accordance with the method according to the invention. This is because the mixture generated in the Y-pipe section 5 and further mixed during its further transport through the second pipe or hose line 11 emerges in a very homogeneous mixture from the discharge opening 12 of the second pipe or hose line 11 and can thus be applied homogeneously distributed over a surface by one operator or even by two operators by moving the second pipe or hose line 11 with its discharge opening 12 back and forth. The advantage of the application device 1 according to the invention is in particular that long conveying distances can be achieved. Because only the particulate material is initially conveyed via the first pipe or hose line, which is not damaged even during a long transport through the first pipe or hose line 2 and the friction that occurs and the heat that is generated, a comparatively long transport distance can be generated here. The heat-sensitive binding agent is only added at the end of the first pipe or hose 2 and is only passed through a limited section of the second pipe or hose line 11, on the one hand to achieve a delivery to a final application location, and on the other hand to be further mixed in this second pipe or hose line 11 and thus homogenized in the mixture. In this case, it is possible to design the first pipe or hose line 2 in a length of up to 200 m, in particular 15-120 m, in particular 30-100 m, and to design the second pipe or hose line 11 in a length of 5-25 m, in particular 10-20 m.

If, for example, a mixture of particulate material and binding agent, in particular of grit and binding agent, is to be spread on the floor of an apartment on a higher floor using the application device 1 according to the invention, the first pipe or hose line 2 is advantageously led upwards up to the Y-pipe section 5 placed at the level of the floor. The first pipe or hose line 2 can be composed, for example, of concrete hoses known per se, for example of seven-meter sections of such concrete hoses. The first pipe or hose line 2 can in particular run relatively rigidly and be fixed, for example, to a scaffold or another holder in order to lead up to the level of the floor. The second pipe or hose line 11 can then advantageously be formed as a flexible hose line, for example composed of flexible hose sections. This second pipe or hose can also be easily routed around corners and the dispensing opening 12 can also be easily moved back and forth for an even application of the mixture to the floor of the projectile.

The use of a spreading device 1 according to the invention and the use of the method according to the invention have proven particularly advantageous when applying a sound insulation layer to the floors of apartments built in timber construction. Here, a mixture of dense particulate material, in particular chippings, and a Particularly good sound insulation is achieved by using a binding agent that is elastic after setting. For example, chippings, particularly stone chippings, particularly from broken stone material, with a grain size of 4-11 mm can be used and a latex dispersion as the binding agent. The mixture can be selected to contain 30 l of binding agent per 1 m ³ of chippings. For example, a chippings delivery rate of 1 m ³ in 4 minutes can be set for spreading the mixture. The chippings can be moistened to prevent dust formation, particularly before they are introduced into the first pipe or hose line 2.

With such a method according to the invention, the floors of high-altitude floors can be covered with a mixture of particulate material and binding agent, whereby the particulate material, such as in particular grit, and also the binding agent are conveyed upwards from the ground, so that no separate conveying of these materials upwards is required, nor is any separate mixing required at the level of the floor of the floor. By using the application device 1 according to the invention or the method according to the invention, a mixture of particulate material with binding agent can be applied with a high throughput over time, even on high-altitude or remote areas, which saves time and thus also leads to a significant reduction in costs.

List of reference symbols

1

Application device

2

first pipe or hose line

3

Grit bunker

4

Bunker and transport vehicle

5

Y-pipe piece

6

first input connection

7

Addition line

8

Binder pump

9

second input port

10

Output connector

11

second pipe or hose line

12

Dispensing opening

13

compressor

14

Compressed air line

15

third input port

16

Pipe socket

17

Pipe section

18

Foot

19

Bolt

20

Bolt

21

Main channel

Claims (15)

Method for applying a mixture containing particulate material, in particular grit, and binding agent to a surface, wherein • particulate material is conveyed in a material flow through a first pipe or hose line (2) to a feed point, • Binder is conveyed through a feed line (7) to the feed point, • the binding agent is added to the material flow of the particulate material at the addition point, • the particulate material with the binding agent is conveyed through a second pipe or hose line (11) to a discharge opening (12) and is applied to the surface through the discharge opening (12), wherein the particulate material is mixed with the binder after the addition of the binder, in particular by generating non-laminar material flows in the second pipe or hose line (11) adjoining the addition point. Method according to claim 1, characterized in that the binder is added at the addition point with an inflow direction directed transversely to a conveying direction of the material flow. Method according to one of the preceding claims, characterized in that a pressurized conveying fluid, in particular compressed air, is also introduced into the material flow at the addition point. Method according to claim 3, characterized in that the pressurized conveying fluid is added together with the binding agent to the material flow of the particulate material. Method according to one of the preceding claims, characterized in that the particulate material is moistened to prevent dust formation. Method according to one of the preceding claims, characterized in that mixture for forming a sound insulation layer is applied to a floor of a multi-storey residential building, wherein the first pipe or hose line (2) and the addition line (7) are led down to the floor, the addition point is located on the floor and the second pipe or hose line (11) is moved along the floor for a uniform application of the mixture to the floor. Device (1) for spreading a mixture containing particulate material, in particular grit, and binding agent on a surface with • a first pipe or hose line (2) leading to a first inlet connection (6) of a Y-pipe section (5), • a first driving device for moving a material flow of particulate material through the first pipe or hose line (2), • a feed line (7) for binding agents leading to a second inlet connection (9) of the Y-pipe section (5), • a second driving device (8) for conveying binding agent through the feed line (7), • a second pipe or hose line (11) connected to an outlet connection (10) of the Y-pipe section (5) and having an outlet opening (12) at an end located away from the outlet connection (10), wherein in the Y-pipe section (5) the metering line (7) opens into a conveying channel formed by the first pipe or hose line (2) and the second pipe or hose line (11). Device (1) according to claim 7, characterized in that the Y-pipe section (11) is designed as a pipe section (17) with a main channel (21) which continues the conveying channel between the first (2) and second (11) pipe or hose line, and with a feed pipe section (16) on which the second inlet connection (9) is arranged and which opens into the main channel (21). Device (1) according to claim 8, characterized in that the feed pipe section (16) opens transversely into the main channel (21), in particular at an angle of 90°. Device (1) according to one of claims 8 or 9, characterized in that in the pipe section (17) in a region located fluidically behind the mouth of the feed pipe section (16), structures (19, 20) projecting into the main channel (21) are formed for swirling the mixture conveyed in the conveying channel. Device (1) according to claim 10, characterized in that the structures (19, 20) are formed by pins or bolts projecting radially inwards from a wall of the pipe section (17) into the main channel (21), in particular by pairs of opposing pins or bolts arranged at different longitudinal positions of the main channel (21) and not extending to the middle of the main channel (21), wherein adjacent pairs of such pins or bolts are rotated in their arrangement by an angle relative to a longitudinal axis of the main channel (21), in particular by 90°. Device (1) according to one of claims 7 to 11, characterized in that a fluid line (14) for a conveying fluid, in particular a compressed air line, connected to a pressure generator (13) is led to the Y-pipe section (5), in particular in the region of the second inlet connection (9) is initially brought together with the metering line (7). Device (1) according to one of claims 7 to 12, characterized in that the first pipe or hose line (2) has a length of 15 to 120 m, in particular 30 to 100 m, and that the second pipe or hose line (11) has a length of 5 to 25 m, in particular 10 to 20 m, and is preferably a flexible line. Y-pipe section (5) for use in a device (1) according to one of claims 7 to 13, characterized in that it is designed as a pipe section (17) with a main channel (21) formed continuously straight along a longitudinal axis and with a Feed pipe section (16), wherein the feed pipe section (16) opens transversely, in particular at an angle of 90°, into the main channel (21), and wherein in a section located beyond the opening of the feed pipe section (16) into the main channel (21), pins or bolts (19, 20) projecting radially inwards from a wall of the pipe section (17) are arranged, in particular at different longitudinal positions of the main channel (21) pairs of pins or bolts (19, 20) lying opposite one another and not extending to the middle of the main channel (21), wherein adjacent pairs of such pairs are rotated in their arrangement by an angle relative to a longitudinal axis of the main channel (21), in particular by 90°. Y-pipe section (5) according to claim 14, characterized by a pressure fluid connection (15) opening into the supply pipe section (16).

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