Sand trap and downpipe arrangement

Abstract

In a grit chamber (1) designed to be installed in the flow path between a downpipe and a stormwater or combined sewer, comprising a watertight housing (2), a connection opening in the housing (2) designated as an inlet (14) which connects to the downpipe in use, a connection opening in the housing (2) designated as an outlet (10) which connects to the sewer in use and is located lower than the inlet (14), a sludge chamber (22) which is located lower than the outlet (10) and has a bottom (3), and a dip tube (11) with an upper inlet opening (16) which is located lower than the inlet (14) and higher than the outlet (10), and with a lower outlet opening (15) which is located lower than the outlet (10) and above the bottom (3) of the sludge chamber (22), wherein the dip tube (11) is tightly connected to the housing (2) at the top,and wherein the immersion tube (11) is designed in such a way as to create a flow path for rainwater from the sludge chamber (22) to the outlet (10) both inside the housing (2) and outside the immersion tube (11), it is proposed that the housing (2) has an upper part (5) having the inlet (14) and a lower part (6) having the outlet (10), wherein the upper part (5) and the lower part (6) are rotatable relative to each other about an upright axis of rotation.

Description

[0001] The invention relates to a sand trap according to claim 1 and a rain pipe arrangement according to claim 13.

[0002] In practice, rainwater downpipe systems are known in which rainwater that has fallen onto a collection surface is channeled downwards from the surface via a downpipe. The collection surface could be, for example, a building roof, an elevated photovoltaic array, or similar. The rainwater can fall onto the collection surface either directly as water or initially as snow or hail, later melting and flowing away as water. The downpipe is connected to a combined sewer or stormwater drain, allowing the rainwater to be discharged in a controlled manner. Since the majority of precipitation is expected to fall as rain, the described system is also referred to as a rainwater downpipe system.

[0003] In practice, the problem can arise that unpleasant odors from the sewer system rise and escape from the top of the downpipe into the open air. The formation of such odors is promoted by the decomposition of organic matter, which can enter the sewer system from elsewhere, or from the collection area via the downpipe. This matter can include, for example, leaves, but also dead small animals such as fledglings. If the downpipe is connected to a combined sewer system, the fecal matter present there can also cause correspondingly unpleasant odors. In addition to the aforementioned odor nuisance, the influx of solids also leads to undesirable silting of the sewer, for example, if sand or similar materials are present.Contaminants from the collection area are flushed through the downpipe into the sewer and settle there if the flow velocity of the liquid flowing in the sewer is so low that it cannot guarantee the transport of these solids.

[0004] From “Lueger: Lexikon der gesamte Technik” a sand trap of this type is known, which is shown under the name “rainpipe odor trap” (http: / / www.zeno.org / Lueger-1904 / A / Kanalisation+%5B1%5D).

[0005] The invention is based on the objective of providing a sand trap that allows for installation and maintenance work with minimal effort. Furthermore, the invention is based on the objective of providing a downpipe assembly that also allows for installation and maintenance work with minimal effort. Finally, the invention is based on the objective of providing a kit for a downpipe assembly that allows for maintenance work with minimal effort.

[0006] Features of the invention are specified in claims 1, 13 and 14. Embodiments are the subject of claims 2 to 12 and 15.

[0007] In other words, the invention proposes a trap for solids, called a sand trap, which is installed between the downpipe and the drain. It is located in the flow path between these two sections of the downpipe assembly and is therefore subject to the flow of rainwater and the solids it contains. The sand trap has a watertight housing with two connection openings. This allows the downpipe to be connected to an inlet and the drain to an outlet of the sand trap. Consequently, the rainwater, along with the solids, can enter the housing of the sand trap from the downpipe through the inlet and subsequently flow out of the housing of the sand trap—largely free of the solids—through the outlet into the drain.The outlet is positioned lower than the inlet, whereby directional terms such as top, bottom, deeper or higher always refer to how the sand trap is oriented in use.

[0008] Within the scope of this proposal, the term "channel" refers to anything connected to the grit chamber outlet. In this context, "channel" also includes any connecting pipe running from the grit chamber outlet to the pipeline conventionally known as a sewer line, wastewater pipe, stormwater drain, or combined sewer.

[0009] The grit chamber also includes a sludge chamber located lower than the outlet and bounded at the bottom by a base. A dip tube extends into this sludge chamber and terminates in a lower outlet opening, which is positioned both lower than the outlet and at a distance above the base. Rainwater can flow into an upper inlet opening of the dip tube, which is located lower than the inlet and higher than the outlet.

[0010] The dip tube seals tightly against the housing at the top, ensuring that all rainwater entering the housing through the inlet is directed into the dip tube's inlet opening and downwards into the sludge chamber, where it exits the dip tube through the outlet opening. The rainwater then rises within the sludge chamber, with the dip tube designed to create a flow path for the rainwater from the sludge chamber to the outlet below the aforementioned sealed housing connection.This can be achieved, for example, in a simple way by making the cross-section of the dip tube smaller than the cross-section of the housing, so that the rainwater can rise inside the sludge chamber next to the dip tube in the housing until the water level reaches the outlet and the rainwater can then flow out of the sand trap and into the canal through the outlet.

[0011] Within the housing, the sludge chamber will always remain filled with water and solids up to the bottom edge of the outlet. In this way, the grit chamber acts as an odor trap because the flow path through which odors could rise from the sewer is interrupted or blocked by this amount of water in the sludge chamber between the outlet and the lower outlet of the dip tube. Furthermore, solids are collected within the sludge chamber, preventing them from entering the sewer and settling there. The solids accumulated in the sludge chamber can be removed regularly using conventional methods, such as a suction hose.Because the dip tube fits tightly against the top of the grit chamber housing, the flow path from the sewer to the downpipe is interrupted at this point as well, preventing any air rising from the sewer and any odors it may carry from entering the downpipe. Conversely, the tight connection ensures that rainwater flowing from the downpipe is completely directed into the dip tube, thus reliably directing all solids carried by the rainwater into the dip tube and consequently into the sludge chamber.

[0012] According to the invention, the housing comprises two separate housing parts arranged one above the other, and accordingly designated as the upper part and the lower part. The inlet is located in the upper part, and the outlet is located in the lower part. While the two upper and lower parts are tightly connected, they are rotatable relative to each other about an upright axis. In this way, the angle between the inlet and outlet can be continuously adjusted when viewed from above, thus simplifying the installation of the sand trap. This allows for easy and optimal adaptation to the specific situation encountered at the construction site, particularly with regard to the position and orientation of the ends of the downpipe and the channel to be connected. The larger the angle within which the rotational mobility is possible, the more easily the housing can be adapted to the specific situation encountered at the construction site.It is particularly advantageous that the upper and lower parts can therefore be freely and without restriction rotatable relative to each other, so that they allow all angular positions within 360° relative to each other.

[0013] In the case of rectangular housings, the upper and lower parts can exhibit the desired rotational mobility relative to each other, as described above, via circular flange connections. However, in a variant of this rotatable housing design considered advantageous, the upper and lower parts are each designed as upright tube bodies. One tube body has a socket located at the end of this tube body adjacent to the other tube body, and the other tube body projects into this socket. This housing design is particularly economical because no special components are required for its manufacture; instead, tubes or tube sections that are part of a standard commercial pipe system can be used as the upper and lower parts.Furthermore, the sleeve connection represents a tried and tested, reliably tight way of connecting these two housing parts and allows free rotation of the two upper and lower parts by any number of degrees relative to each other.

[0014] In this context, a particularly advantageous design is considered to be one in which the socket is located at the upper end of the lower body, so that the upper pipe body is inserted into the socket with its lower end, thus ensuring particularly reliable drainage of all rainwater from the upper part of the housing into the lower part.

[0015] In one embodiment, the housing projects upwards beyond the inlet and has a removable lid. This upward projection allows the sand trap to be installed, for example, so that the lid is flush with the ground surface, such as paving. In this way, the lid can be removed, providing access to the interior of the housing for cleaning or maintenance. In a variant of this embodiment considered advantageous, the lid not only rests on the upper end of the housing as a plate, but also features a downward-facing spigot extending from this plate. This spigot interacts with the housing in a telescopic manner, either extending into the housing or—particularly preferably—overlapping the outside of the housing.The length of such a nozzle determines the extent to which the height of the sand trap can be adjusted to the surrounding soil surface, by allowing the cover plate to be positioned at continuously varying distances above the upper end of the housing.

[0016] In one design, the dip tube can be removed upwards from the housing. If the dip tube has a sufficiently large diameter, a flushing or suction hose can also be inserted through it into the sludge chamber. However, handling the hose is easier if the dip tube has been removed beforehand; furthermore, hose diameters can be used that would not fit through a dip tube permanently installed in the housing.

[0017] Furthermore, removing the dip tube provides access to the grit chamber outlet, which is located below the upper inlet of the dip tube. This is advantageous, for example, when the sewer is to be rehabilitated by inserting a liner: in this case, the grit chamber does not need to be completely removed. Instead, after removing the dip tube, the liner can be inserted from above into the grit chamber housing and then through its outlet into the sewer. Rehabilitation is carried out, for example, using so-called prepregs, where the liner is designed as a resin-impregnated tube that is inserted into the sewer and then inflated so that it conforms to the existing sewer wall, allowing the resin to then cross-link and cure.

[0018] In one embodiment, the immersion tube is arranged off-center within the housing, such that its distance to the outlet opening in the housing is greater than its distance to the housing wall section opposite the outlet. This improves the hydraulic performance of the grit chamber compared to an immersion tube running centrally within the housing. A flow channel is created alongside the immersion tube, which has a relatively small wall area compared to its flow cross-section. This small wall area could impede or slow the flow due to frictional losses.

[0019] In one variant of this design, considered advantageous, the removable dip tube has a handle. The grit chamber is typically located at a shallow depth within the ground, allowing the dip tube to be easily grasped by hand and then pulled upwards out of the grit chamber housing. The handle can therefore be designed as a manual grip. Alternatively, the handle can be small enough to be gripped with a hook or similar device, thus providing access to the dip tube for removal from the housing.

[0020] The inlet and outlet can be designed as simple openings, such as bores, in the housing wall. In one embodiment, the inlet, or the outlet, or both, are each designed as a pipe stub extending from the housing. This also allows for a connection of other elements to the inlet and / or outlet, as is proven in pipeline construction. For example, a direct connection of the downpipe or drain, or the connection of intermediate pieces that link the downpipe or drain to the grit chamber, can be made. The respective pipe stub can, for instance, have a diameter widely used in pipeline construction, such as a standardized diameter, so that commercially available components from a pipe system can be connected to the inlet and / or outlet using a socket connection.The pipe stub can form either the spigot end or the socket end for such a socket connection, with one variant considered particularly advantageous having an end designed as a socket.

[0021] In a particularly advantageous design of the outlet as a pipe stub, this pipe stub connects to the housing at an angle sharper than 90°. For example, in longitudinal section, the pipe stub can have a 45° angle to the housing in its upper circumferential region, or it can transition into the housing with a curved path in its upper circumferential region. In any case, an inlet ramp is created which, in the event of sewer rehabilitation, facilitates the insertion of a liner into the drain of the grit chamber and into the sewer.

[0022] In one embodiment, a "tongue" is arranged at the bottom of the drain – either exclusively or in addition to the aforementioned inlet slope – which facilitates the insertion of a camera or a flushing hose and the attachment of the liner in the case of sewer rehabilitation. For example, such a tongue can project into the housing as a projection in the lower circumferential area of ​​the drain, so that elements inserted into the housing from above can come into contact with the tongue and thus be guided into the drain.

[0023] In one embodiment, the upper end of the immersion tube is designed as a reducer. Reducers are commonly known as standard components of pipe systems. They are funnel-shaped pipe sections that taper either conically or in steps from a first end with a larger diameter to a second end with a smaller diameter. Reducers are known in a symmetrical design, in which the two circular openings at the two ends of the reducer are each centrally located, so that their centers lie on the central axis of the reducer. Alternatively, asymmetrical reducers are also known, in which the centers of the two openings are offset from each other with respect to the central axis of the reducer.The asymmetrical arrangement of the dip tube is particularly advantageous with small housing diameters, as it allows for higher hydraulic performance at the outlet of the storm drain sand trap compared to a symmetrical arrangement. The position of the dip tube relative to the outlet can be predetermined to facilitate installation during initial setup and after maintenance work, for example, through a suitable geometric design within the housing, such as a projection on the inside of the housing that engages in a groove of the dip tube.

[0024] In one embodiment, the upper end of the immersion tube has an outwardly projecting, circumferential collar. This collar rests the immersion tube on a support ring located inside the housing and tightly adhering to the housing wall. The support ring can connect directly to the housing wall, for example, as a projection or rib extending into the housing interior. Alternatively, for instance, with a correspondingly large housing diameter, the support ring can connect indirectly to the housing wall, for example, as an upwardly projecting step or raised edge on a horizontally extending plate located inside the housing, surrounding an opening through which the immersion tube extends downwards.

[0025] In the embodiment described above, a variant in which a seal is arranged between the collar and the support ring is considered advantageous. Thus, there is no radial seal between the dip tube and the housing; rather, the dip tube's own weight ensures a reliably tight seal against both the collar and the support ring. A radial seal against the housing would lead to friction along the entire length of the dip tube's insertion into or removal from the housing. This friction could damage the seal and impair its sealing effect, which is avoided by the axially acting seal design.

[0026] The outlet of the dip tube can be designed as one or more openings in the tube's outer surface near its lower end. In one embodiment, however, the dip tube is open at the bottom. This creates a large, unobstructed cross-section, allowing rainwater and the entrained solids to flow freely out of the dip tube, thus ensuring the smoothest possible operation of the grit chamber and minimizing the risk of blockages.

[0027] The invention further relates to a rainwater pipe arrangement comprising, firstly, a downpipe which, in use, conveys rainwater downwards from a collection surface; secondly, a channel in the form of a rainwater or combined sewer which, in use, receives the rainwater conveyed from the downpipe; and thirdly, a grit chamber according to the invention. The grit chamber is arranged in the flow path between the downpipe and the channel, connecting to the downpipe with its inlet and to the channel with its outlet, the outlet being arranged lower than the inlet.

[0028] The sand trap according to the invention thus makes it possible to collect sand, leaves, and other solids that are washed off a collection surface, such as a building roof, by precipitation. Furthermore, the sand trap prevents odors from rising from the sewer into the downpipe and escaping from the downpipe into the open air. Finally, with a suitable design, the sand trap can also offer the possibility of sewer rehabilitation without having to remove the sand trap for such work, namely if the dip tube on the housing is removable and, advantageously, the outlet forms an entry ramp and connects to the housing at a correspondingly acute angle in its upper receiving area.

[0029] The invention further relates to a kit for a rainwater pipe assembly, which is designed as described above, wherein the kit also includes an additional component which can optionally be inserted into the housing in place of the dip tube. This additional component can be exchanged for the dip tube if maintenance or repair work is to be carried out on the pipe. With respect to the longitudinal axis of the housing, this component has an inclination, e.g., by being bent or having multiple angles in its cross-section. Alternatively, in one embodiment, even if it has a straight cross-section, the inclination is formed by its installation position in the housing, by being oriented obliquely to the longitudinal axis of the housing. In any case, the inclination of this additional component is designed or oriented in the housing in such a way as to facilitate the insertion of an object into the drain, e.g.,an inliner, inspection camera, flushing tool, or similar device can be guided into the drain by directing the object, which is inserted into the housing from above, into the drain. Accordingly, maintenance or repair work can be carried out without first having to remove the grit chamber to ensure easy access to the inside of the pipe. Instead, the grit chamber can remain in place, and only the dip tube is replaced with the additional component. After completion of the maintenance or repair work, the additional component is removed from the housing and the dip tube is reinstalled, so that the grit chamber is operational again and the overall effort required for the maintenance or repair work has been minimized.

[0030] The economic cost of providing the additional component is low, as it is not necessary to assign a separate additional component to each sand trap and store it nearby. Instead, the additional component can be brought in along with the necessary materials during maintenance or repair work and reused in many other sand traps after the work is completed.

[0031] The additional component can be particularly advantageous if it is designed to cover a bearing or sealing surface on which the immersion tube would otherwise rest. This protects the bearing or sealing surface from mechanical damage, such as abrasion, during maintenance or refurbishment work. It also protects it from contaminants that could impair the seal of the bearing or sealing surface. These contaminants could include resin used during refurbishment, other substances used in maintenance or refurbishment work, or material deposits that are detached from the housing walls during maintenance or refurbishment.

[0032] Further features, details and advantages of the invention will become apparent from the wording of the claims and from the following description of exemplary embodiments with reference to the drawings. The drawings show: Fig. 1. A view of a rainwater pipe arrangement with a sand trap in its operating position, and Fig. 2 a vertical section through the rain pipe arrangement along line II - II in Fig. 1. Fig. Figure 1 shows a rain pipe arrangement with a sand trap 1, which has a housing 2, which is closed off at the bottom by a base 3 and covered at the top by a lid 4.

[0033] The housing 2 comprises an upper part 5 and a lower part 6, each designed as a pipe section from a standard pipe system and connected to each other by means of a socket connection. For this purpose, the lower part 6 has a socket 7 at its upper end, into which the lower end of the upper part 5 is inserted. In this way, the upper part 5, the lower part 6, and the vertical central axis of the housing 2 can be rotated continuously relative to each other.

[0034] The base 3 is formed by an end cap which is placed on the lower end of the base part 6 and tightly connected to it, for example by gluing or welding.

[0035] The cover 4 has a cover plate 8 which can be optionally inserted into or removed from a pipe socket 9, the pipe socket 9 being supported on a load distribution plate which is placed on the ground at a predetermined height. The pipe socket 9 extends around the outside of the upper end of the top part 5 and, in contrast to placing the cover plate directly onto the housing 2, allows for height adjustment to a ground covering such as paving or the like.

[0036] The lower part 6 has a drain 10, which is designed as a pipe stub and is connected to a sewer pipe 23 by means of straight and curved connecting pieces. The sewer pipe 23 is part of a wastewater or combined sewer. In its upper circumferential section, the pipe stub of the drain 10 has an inclined surface 12, so that the drain 10 connects to the housing 2 at an angle greater than 90°.

[0037] Fig. Figure 2 shows that the upper part 5 of the housing 2 has an inlet 14, which, like the outlet 10, is also designed as a pipe stub and, like the outlet 10, also forms a socket, thus simplifying the connection of further pipe sections to the inlet 14 and the outlet 10. An intermediate piece in the form of a pipe bend connects to the inlet 14, which connects the inlet 14 to a vertically running rain pipe 24, also referred to as a downpipe, so that rainwater from the rain pipe 24 is directed into the sand trap.

[0038] A dip tube 11 terminates at a distance above the base 3 and forms a lower outlet opening 15 with its open lower end. At its upper end, the dip tube 11 has an inlet opening 16, which has a larger diameter than the outlet opening 15. The inlet opening 16 is formed by an asymmetrical reducer 17 of the dip tube 11, which has an externally circumferential collar 18. This collar 18 supports the dip tube 11 on a support ring 19, which projects inwards from the wall of the housing 2 as a circumferential rib. A seal 20 runs between the collar 18 and the support ring 19, which is subjected to the weight of the dip tube 11 and thus fits tightly against the collar 18 and the support ring 19.In the illustrated embodiments, the seal 20 is attached to the reducer 17, for example by being glued to the reducer 17 or by being fitted onto the reducer 17 as a sealing ring under tension.

[0039] The immersion tube 11, arranged asymmetrically in the housing 2, can be equipped with an anti-rotation device, which is not shown in the drawing for clarity. The anti-rotation device ensures that the immersion tube 11, relative to the vertical central axis of the housing 2, can only be accommodated within a predetermined range of rotation angles and, if necessary, only in a specific angular position within the housing 2. The anti-rotation device is designed such that the immersion tube 11 does not hang directly in front of the drain 10 and obstruct the flow to the drain 10, but rather, for example, as shown in the diagram. Fig. 2 is visibly arranged in the housing 2, namely at the greatest possible distance from the drain 10.

[0040] The immersion tube 11 has a handle 21, which in the illustrated embodiments is designed as a handgrip and is attached to the reducer 17. Using the handle 21, the immersion tube 11 can be lifted out of the housing 2 after the cover 4 has been removed from the housing 2.

[0041] In operation, rainwater flows from the downpipe 24, which is connected to the inlet 14, into the housing 2, flows downwards and through the inlet opening 16 into the dip tube 11, flows through the dip tube 11 and exits through its outlet opening 15 into a sludge chamber 22. The rainwater and the solids it carries collect in this chamber, typically settling there as the water level rises. Fig. Figure 2 shows the water level, marked with 13, at the height where it reaches the lower edge of the outlet 10. Any additional rainwater flowing in will exit the grit chamber 1 through the outlet 10 and flow into the sewer pipe 23, particularly as part of a stormwater or combined sewer system connected to the outlet 10 via the connecting pieces.

[0042] If no further precipitation enters the sand trap 1, the water level 13 inside the housing 2 will be as shown in Fig.2, indicated at the level of the lower edge of the outlet 10. A flow connection for gases, e.g., air, between the outlet 10 and the inlet 14 through the dip tube 11 is interrupted by this water level. There is also no flow connection past the dip tube 11 between the outlet 10 and the inlet 14, as the dip tube 11 seals tightly against the housing 2 by means of the seal 20. Therefore, gases rising from the sewer pipe 23 cannot enter the downpipe 24.

[0043] After removing the cover 4, the dip tube 11 can be grasped by the handle 21 and removed from the housing 2, so that the drain 10 is now accessible from the upper end of the housing 2. For maintenance work, tools can be inserted into the sewer pipe 23 through the drain 10, which is facilitated by the inclined surface 12, forming an insertion ramp for such tools. In the case of sewer rehabilitation, this insertion ramp facilitates the insertion of a liner into the sewer pipe. The inclined surface 12 can be replaced—or, particularly advantageously, supplemented—by a tongue, not shown in the drawing, which projects into the interior of the housing 2 in the lower circumferential region of the drain 10.

[0044] The invention is not limited to one of the embodiments described above, but can be modified in many ways.

[0045] All features and advantages arising from the claims, the description and the drawing, including design details, spatial arrangements and process steps, can be essential to the invention both individually and in various combinations. Reference symbol list 1 sand trap 2 cases 3 floors 4 lids 5 Top 6 lower part 7 sleeve 8 Cover plate 9 pipe fittings 10 Procedure 11 Dip tube 12 inclined surface 13 Water levels 14 Inflow 15 Outlet 16 Inlet 17 Reducer 18 collars 19 Support ring 20 Seal 21 handle 22 Mud room 23 sewer pipes 24 Rain pipe QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited non-patent literature

[0000] http: / / www.zeno.org / Lueger-1904 / A / Kanalisation+%5B1%5D

[0004]

Claims

[1] Sand trap (1), the • is designed to be used in the flow path between a downpipe and a rainwater or combined sewer, • has a waterproof housing (2), • has a connection opening in the housing (2) designated as an inlet (14), which connects to the downpipe during use, • has a connection opening in the housing (2) designated as drain (10), which connects to the channel in use and is located lower than the inlet (14), • has a sludge chamber (22) which is located lower than the outlet (10) and has a bottom (3), • has a dip tube (11), ◯ with an upper inlet opening (16) that is positioned lower than the inlet (14) and higher than the outlet (10), ◯ and with a lower outlet opening (15) which is located lower than the outlet (10) and above the bottom (3) of the sludge chamber (22), ◯ wherein the immersion tube (11) connects tightly to the housing (2) at the top, ◯ and wherein the immersion tube (11) is designed in such a way that it creates a flow path for rainwater from the sludge chamber (22) to the outlet (10) inside the housing (2) and outside the immersion tube (11), characterized by , that the housing (2) has an upper part (5) having the inlet (14) and a lower part (6) having the outlet (10), wherein the upper part (5) and the lower part (6) are rotatable relative to each other about an upright axis of rotation. [2] Sand trap according to claim 1, characterized by , that the immersion tube (11) is arranged off-center in the housing (2) such that its distance to the connection opening in the housing (2) forming the drain (10) is greater than to the wall section of the housing (2) opposite the drain (10). [3] Sand trap according to claim 1 or 2, characterized by, that the immersion tube (11) can be removed upwards from the housing (2). [4] Sand trap according to any one of the preceding claims, characterized by , that the dip tube (11) has a handle (21). [5] Sand trap according to any one of the preceding claims, characterized by , that the upper part (5) and lower part (6) are each designed as upright pipe bodies, a socket (7) is arranged on one pipe body at its end adjacent to the other pipe body, and the other pipe body projects into the socket (7). [6] Sand trap according to any one of the preceding claims, characterized by , that the inlet (14) and / or the outlet (10) is shaped as a pipe nozzle extending away from the housing (2). [7] Sand trap according to claim 6, characterized by that the pipe stub has an end designed as a socket. [8] Sand trap according to claim 6 or 7, characterized by, that the pipe nozzle of the drain (10) connects to the housing (2) at an angle sharper than 90° at the top. [9] Sand trap according to any one of the preceding claims, characterized by , that the upper end of the immersion tube (11) is designed as a reducer (17). [10] Sand trap according to any one of the preceding claims, characterized by , that the upper end of the immersion tube (11) has an outwardly projecting, circumferential collar (18) and with this collar (18) lies on a support ring (19) which runs inside the housing (2) and is close to a housing wall. [11] Sand trap according to claim 10, characterized by , that a seal (20) is arranged between the collar (18) and the support ring (19). [12] Sand trap according to any one of the preceding claims, characterized by , that the immersion tube (11) opens at the bottom. [13] Rainwater pipe arrangement, with a downpipe designed to direct rainwater downwards from a rainwater collection area, and with a rainwater or combined sewer, designated as a channel, which is designed to receive the rainwater brought in from the downpipe during use, characterized by a sand trap (1) according to one of the preceding claims, • which is located in the flow path between the downpipe and the channel, • whose inlet (14) connects to the downpipe, • and whose outlet (10) connects to the channel and is located lower than the inlet (14). [14] Kit for a downpipe assembly, with a rain pipe arrangement according to claim 13, and with another component which can optionally be inserted into the housing in place of the immersion tube, wherein this component has a slope with respect to the longitudinal axis of the housing or is designed to form the slope by its installation position in the housing, such that the slope directs an object introduced into the housing from above into the drain during use. [15] Kit according to claim 14, characterized by that the additional component is designed to cover a support or sealing surface during use, on which the immersion tube would otherwise rest.

Images