Sand trap and downpipe arrangement
Patent Information
- Application Number
- DE202024106102
- Authority / Receiving Office
- DE · DE
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2024-10-23
- Publication Date
- 2025-04-10
- Estimated Expiration
- 2034-10-31
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
The invention relates to a sand trap according to claim 1 and a rain pipe arrangement according to claim 13.From practice, rain pipe arrangements are known in which precipitation water which has arrived on a collecting surface is conducted downward from the collecting surface via a downpipe. The collecting surface can be, for example, a building roof, a standing photovoltaic surface or the like. The precipitation water can either reach the collecting surface directly as water or first in the form of snow or hagel and run off later in a molten state as water. The downcomer is connected to a mixed water or rainwater channel, so that the rainwater can be discharged in a controlled manner. Since most of the deposits are expected to occur in the form of rain, the arrangement described is also referred to as a rain tube arrangement.In practice, the problem may arise that odors that are disadvantageously perceived as rising up from the sewer system and can pass out of the upper end of the downcomer into the open air. The formation of odors of this type is promoted by the decomposition or use of organic solids, which can pass into the duct elsewhere, but also from the collecting surface through the downcomer. The solids can be leaves, for example, but also dead smaller animals, such as young birds. If the rainfall pipe is connected to a mixed water channel, the faeces located there may correspondingly cause unpleasant odours. In addition to the mentioned odor nuisance, the flushing in of solids also leads to an undesired fouling of the canal, for example when sand or the like. The liquid flowing in the channel can be flushed from the collecting surface through the downcomer into the channel and deposited there if the flow velocity of the liquid flowing in the channel is so low that it cannot ensure the transport of these solids.From "Lueger: Lexikon der Gunschafttechnik", a generic sand trap is known, which is represented under the designation "Rainpipe odour seal" (http: / / www.zeno.org / Lueger-1904 / A / Canalisation+%5B1%5D).The object of the invention is to provide a sand trap which enables installation and maintenance work with little effort. It is a further object of the invention to provide a rain pipe arrangement which likewise enables installation and maintenance work with little outlay. It is a further object of the invention to provide a construction kit for a rain pipe arrangement which enables maintenance work with little effort.Features according to the invention are set out in claims 1, 13 and 14. Embodiments are the subject matter of claims 2 to 12.In other words, the invention proposes a trap for the solid bodies, which trap is referred to as sand trap and is installed between the downcomer and the duct, so that it is located in the flow path between these two sections of the downcomer arrangement and is accordingly flowed through by the precipitation water and the solids contained therein. The sand trap has a watertight housing which, however, has two connection openings, so that the downcomer can be connected to an inlet and the channel can be connected to an outlet of the sand trap and accordingly the precipitation water together with the solids from the downcomer can pass through the inlet into the housing of the sand trap and later-as far as possible without the solids cannot flow through the outlet from the housing of the sand trap and into the channel. The outlet is arranged lower than the inlet, wherein directional information such as top, bottom, lower or higher is related to how the sand trap is oriented during use.Within the scope of the present proposal, a channel is referred to, which follows the discharge of the sand trap. In this context, a connection line is therefore also referred to as a channel, which runs from the outlet of the sand trap to the pipeline, which is conventionally referred to as a channelization line, wastewater channel, rainwater channel or mixed water channel.The sand trap further comprises a sludge space which is arranged lower than the drain and is bounded downwardly by a floor. A dip tube extends into this sludge space and terminates with a lower outlet orifice which is located lower than the drain and spaced above the bottom. Precipitation water can flow into an upper inlet opening of the immersion pipe, wherein this inlet opening is arranged lower than the inlet and higher than the outlet.The immersion pipe connects at the top close to the housing, so that all precipitation water which reaches the housing through the inlet is guided into the inlet opening of the immersion pipe and in the immersion pipe downwards into the sludge space, where it exits from the immersion pipe via the outlet opening. The precipitation water then rises inside the sludge space, wherein the immersion pipe is designed in such a way that it creates a flow path for the precipitation water from the sludge space to the outlet below the above-mentioned tight housing connection inside the housing. This can be achieved, for example, in a simple manner by the cross section of the immersion pipe being smaller than the cross section of the housing, so that the precipitation water can rise inside the sludge space outside next to the immersion pipe in the housing until the water level reaches the outlet and the precipitation water can then flow through the outlet out of the sand trap and into the channel.Inside the housing, the sludge space will always remain filled with water and the solids up to the lower edge of the drain. In this way, the sand trap forms an odour seal because the flow path through which odours could rise from the channel between the outlet and the lower outlet mouth of the dip tube is interrupted or closed by this amount of water located in the sludge space. Furthermore, solids are collected within the sludge chamber, so that they cannot enter the channel and settle there. The solids collected in the sludge space can be regularly removed in a manner known per se, for example by means of a suction hose. Because the immersion pipe is closely connected at the top to the housing of the sand trap, a flow path from the channel to the downcomer is also interrupted at this location, so that no air rising from the channel and the odors possibly transported therewith can enter the downcomer even at this location. The tight connection ensures in the opposite flow direction for the precipitation water flowing out of the downcomer that it is conducted completely into the immersion pipe, so that all solids transported with the precipitation water are also conducted reliably into the immersion pipe and thus into the sludge space.According to the invention, the housing has two separate housing parts which are arranged one above the other and are accordingly designated as upper part and as lower part. The inlet is arranged in the upper part and the lower part has the outlet. The two upper and lower parts are indeed tightly connected to one another, but are rotatable relative to one another about an upright axis of rotation. In this way, viewed from above, the angle between inlet and outlet can be adjusted continuously, so that the installation of the sand trap is simplified, since optimum adaptation to the situation found at the construction site in each case is made possible in a simple manner, in particular with regard to the position and orientation of the ends of the downpipe and of the duct to be connected. The larger the angle within which the rotational mobility is given, the more problem-free the housing can be adapted to the situation found at the construction site. Particularly advantageously, the upper and lower parts can therefore be freely, not restrictedly rotatable relative to one another, so that they enable all angular positions within 360° relative to one another.In the case of housings of angular configuration, the upper and lower parts thereof can have the desired rotational movability with respect to one another via circular flange connections. In a variant of this rotationally movable housing configuration which is considered to be advantageous, however, the upper part and the lower part are each configured as an upright tubular body, wherein a sleeve is arranged on the one tubular body, namely at the end of this tubular body which is adjacent to the other tubular body, and wherein the other tubular body projects into this sleeve. Such a configuration of the housing is particularly economical, on the one hand, because no special components are required for producing the housing, but tubes or tube sections can be used as the upper part and the lower part, which are part of a commercially available tube program. In addition, the sleeve connection represents a type of connection of these two housing parts which has proven to be effective in practice and is reliably tight and enables the two upper and lower parts to be freely rotationally movable by any number of degrees relative to one another.In this context, an embodiment is considered to be particularly advantageous in which the sleeve is located at the upper end of the lower upper body, so that the upper tubular body is inserted with its lower end into the sleeve and in this way it is ensured in a particularly reliable manner that all precipitation water is conducted from the upper part of the housing into the lower part.In one embodiment, the housing projects upwards beyond the inlet and has a removable cover. By means of the upwardly projecting protrusion, the sand trap can be installed, for example, in such a way that the cover is located levelly in a ground surface, for example in a pavement. In this way, the cover can be removed so that the interior of the housing is accessible for cleaning or maintenance purposes. In a variant of this embodiment considered advantageous, the cover not only lies in the form of a plate on the upper end of the housing, but has a connecting piece which interacts with the housing in a telescopic manner downwards adjoining such a plate, that is to say either extends into the housing or-particularly preferably-engages over the housing on the outside. The length of such a stub determines the extent by which height adjustment of the sand trap to the surrounding ground surface is possible by arranging the cover plate at continuously different distances above the upper end of the housing.In one embodiment, the immersion tube can be removed from the housing in the upward direction. If the diameter of the immersion pipe is sufficiently large, a flushing or suction hose can also be guided through the immersion pipe into the sludge chamber. However, the handling of the hose is facilitated if the immersion pipe has been removed beforehand; moreover, hose diameters can be used which could not be passed through an immersion pipe fixedly installed in the housing.Furthermore, removal of the dip tube provides access to the discharge of the sand trap which is located below the upper inlet opening of the dip tube. This is advantageous, for example, if the channel is to be remanaged by the retraction of a liner or inliner: in this case, the sand trap does not have to be completely removed, but rather the liner can be guided from above into the housing of the sand trap after removal of the immersion tube and then through its outlet into the channel. The rehabilitation takes place, for example, with the aid of so-called prepregs, in which the respective liner or inliner is designed as a tube impregnated with resin, which is drawn into the channel and subsequently inflated, so that it bears against the existing channel wall and the resin of which is subsequently crosslinked or cured.In one configuration, the immersion pipe is arranged eccentrically in the housing, namely in such a way that its distance from the connection opening in the housing forming the outlet is greater than from the wall section of the housing which is opposite the outlet. Thus, the hydraulic performance of the sand trap is improved in comparison with a dip pipe running centrally in the housing. A flow channel is created next to the immersion pipe, which has a comparatively small wall surface in relation to its flow cross section, which could impair or brake the flow as a result of friction losses.In a variant of this embodiment considered advantageous, the removable immersion tube has a handle. The sand trap is typically located at a small depth within the floor, so that the immersion pipe can be gripped easily by hand on the handle and then pulled upward out of the housing of the sand trap. The handle can accordingly be dimensioned such that it is designed as a handle and can be manually gripped. Alternatively, the grip can be dimensioned so small that it can be gripped by means of a hook or the like and in this way enables access to the immersion tube in order to pull it out of the housing.The inlet and the outlet can be designed as simple openings, for example as bores, in the housing wall. In one embodiment, the inlet or the outlet or both are each formed as a pipe socket which extends away from the housing. This also makes it possible to connect further elements which have proven their worth in pipeline construction to the inlet and / or to the outlet, for example a direct connection of the downcomer or of the duct, or to connect intermediate pieces which connect the downcomer or the duct to the sand trap. For example, the respective pipe socket can have a diameter which is widely used in pipeline construction, for example standardized, so that commercially available elements of a pipe program can be connected to the inlet and / or outlet by means of a sleeve connection. The pipe socket can thereby form either the tip end or the sleeve end for such a sleeve connection, wherein in a variant considered to be particularly advantageous the pipe socket has an end designed as a sleeve.In a variant of the embodiment of the outlet as a pipe socket which is considered to be particularly advantageous, this pipe socket connects at the top to the housing at an acute angle of more than 90°. For example, the pipe socket, as seen in longitudinal section, can have an angle of 45° with respect to the housing in its upper circumferential region, or can merge into the housing in its upper circumferential region in a curved manner. In any case, an inlet slope is created which, in the case of a channel formation, facilitates the drawing-in of a liner into the outlet of the sand trap and into the channel.In one embodiment, either exclusively or additionally to the abovementioned inlet slope, a "tongue" is arranged at the bottom of the outlet, which facilitates the introduction of a camera or a rinsing hose and the attachment of the inliner in the case of a canal anchoring. For example, in the lower circumferential region of the drain, such a tongue can protrude into the housing as a protrusion, so that elements introduced into the housing from above can come against the tongue and can thereby be guided into the drain.In one embodiment, the upper end of the immersion pipe is designed as a reducer. Reducers are known in practice as commercially available components of pipe programs. They are funnel-like pipe sections which taper either conically or stepwise from a first end having a first diameter to a second end having a smaller, second diameter. Reducing pieces are known in a symmetrical configuration, in which the two circular openings at the two ends of the reducing piece are each arranged centrally, so that their centers lie on the central axis of the reducing piece. Alternatively, asymmetrical reducing pieces are also known in which the center points of the two openings are offset relative to one another with respect to the center axis of the reducing piece. The asymmetrical arrangement of the immersion pipe is advantageous in particular with small housing diameters, since in this case it enables a higher hydraulic capacity at the outlet of the rain pipe sand trap compared to a symmetrical arrangement. The position of the immersion pipe in relation to the outlet can be predetermined in order to facilitate the installation of the immersion pipe during the first installation and after maintenance work, for example by a corresponding geometric configuration in the housing, such as a projection on the inner side of the housing, which engages in a groove of the Tauich pipe.In one embodiment, the upper end of the immersion tube has an outwardly projecting, encircling collar. With this collar, the immersion tube rests on a support ring, which runs inside the housing and connects tightly to the housing wall. The support ring can connect directly to the housing wall and project, for example, as a projection or rib from the housing wall into the interior of the housing. Alternatively, for example with a correspondingly large housing diameter, the support ring can connect indirectly to the housing wall, for example as an upwardly projecting step or edge on a horizontally running plate which is arranged in the housing and surrounds an opening through which the immersion tube extends downwardly.In this embodiment described above, a variant is considered to be advantageous in which a seal is arranged between the collar and the support ring. Thus, there is no radial sealing of the immersion tube against the housing, but rather the dead weight of the immersion tube acts a reliably tight contact of the seal against both the collar and the support ring. A radial seal against the housing would result in friction over the entire path length over which the dip tube is inserted into the housing or removed from the housing. This friction could damage the seal and impair the sealing effect, which is avoided by the design as a seal acting in the axial direction.The outlet opening of the immersion pipe can be designed as one or more openings in the lateral surface of the immersion pipe near its lower end. In one embodiment, however, the immersion pipe opens open at the bottom. In this way, on the one hand, a large free opening cross section is created and the precipitation water together with the entrained solids can exit the immersion pipe without deflection, so that the smoothest possible, trouble-free operation of the sand trap is ensured and the risk of blockages of the immersion pipe can be kept as low as possible.The invention further relates to a rainwater pipe arrangement which firstly comprises a downcomer which, in use, conducts rainwater downwardly from a collecting surface, secondly comprises a channel in the form of a rainwater or mixed water channel which, in use, receives the rainwater which is supplied from the downcomer, and thirdly comprises a sand trap according to the invention. The sand trap is arranged in the flow path between the downcomer and the channel, connects with its inlet to the downcomer and with its outlet to the channel, wherein the outlet is arranged lower than the inlet.The sand trap of the present invention thus makes it possible to trap sand, leaves and other solids which are rinsed off by precipitation from a collecting surface such as a roof of a building. Furthermore, the sand trap prevents odors from rising from the channel into the downcomer and from being able to pass out of the downcomer into the open. Finally, the sand trap, with a corresponding configuration, can also offer the possibility of rehabilitating the channel without having to remove the sand trap for such operations, namely if the immersion pipe can be removed on the housing and the outlet advantageously forms an introduction slope and adjoins the housing at a correspondingly acute angle in its upper receiving region.The invention further relates to a kit for a rain pipe arrangement which is configured as described above, wherein the kit additionally has a further component which can optionally be inserted into the housing instead of the immersion pipe. This additional component can be replaced by the immersion pipe if maintenance or repair work is to be carried out on the channel. With respect to the longitudinal axis of the housing, this component has a slope, for example by being curved in its cross section or angled several times. Alternatively, in one embodiment, the slope, even if it should be of rectilinear configuration in cross section, forms by its installation position in the housing, in that it is oriented obliquely to the longitudinal axis of the housing. In any case, the bevel of this additional component is designed or oriented in the housing in such a way that it facilitates the introduction of an object into the outlet, for example an inliner, an inspection camera, a flushing tool or the like, by directing the relevant object introduced into the housing from above into the outlet. Accordingly, the maintenance or rehabilitating operations can be performed without the need to first remove the grit trap and then provide ready access to the interior of the canal. Instead, the sand trap can remain installed and only the immersion pipe is replaced with the additional component. After completion of the maintenance or rehabilitation work, the additional component is removed from the housing and the immersion pipe is inserted again, so that the sand trap is ready for operation again and the total amount of work required for the maintenance or rehabilitation work could be kept as low as possible.The economic outlay for the provision of the additional component is low, since each sand trap does not have to be assigned its own additional component and, for example, stored in the vicinity of the sand trap. Rather, the additional component can also be brought up together with the required working material during the maintenance or rehabilitation work and reused again in many other sands after the completion of the maintenance or rehabilitation work.Particularly advantageously, the additional component can be designed in such a way that it covers a bearing or sealing surface on which the immersion tube otherwise rests. This bearing or sealing surface can thus also be protected during the maintenance or repair work from mechanical damage, such as e.g. abrasion. It can also be protected in this way from contaminants which could impair the tightness of the bearing or sealing surface. The contaminants can be produced, for example, by a resin used in the rehabilitation process or by other substances used in maintenance or rehabilitation tasks, as well as by material deposits which are detached from the wall surfaces in the housing during the maintenance or rehabilitation tasks.Further features, details and advantages of the invention are evident from the wording of the claims and from the following description of exemplary embodiments on the basis of the drawings. The following are shown: FIG. 1 is a view of a rain pipe arrangement with a sand trap in its position of use; and FIG. 2 is a vertical section through the rain tube arrangement along the line II--II in FIG. 1.FIG. 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 is covered at the top by a cover 4.The housing 2 has an upper part 5 and a lower part 6, which are each designed as pipe pieces from a commercially available pipe program and are connected to one another by means of a sleeve connection. For this purpose, the upper end of the lower part 6 has a sleeve 7 into which the lower end of the upper part 5 is inserted. In this way, the upper part 5 and the lower part 6 and the upright central axis of the housing 2 can be rotated continuously with respect to one another.The base 3 is formed by an end cap which is placed on the lower end of the lower part 6 and is tightly connected thereto, for example glued or welded.The cover 4 has a cover plate 8 which can be inserted into a pipe socket 9 or removed therefrom as desired, 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 upper part 5 and, in comparison thereto, makes it possible to place the cover plate directly on the housing 2, to adapt its height to a floor covering such as, for example, a plaster or the like.The lower part 6 has a drain 10 which is designed as a pipe socket and is connected to a duct 23 by means of straight and arcuate intermediate pieces. The channel pipe 23 is part of a waste water or mixed water channel. In its upper circumferential section, the pipe socket of the outlet 10 has an inclined surface 12, so that the outlet 10 adjoins the housing 2 at the top at an acute angle of more than 90°.FIG. 2 shows that the upper part 5 of the housing 2 has an inlet 14, which, like the outlet 10, is likewise designed as a pipe socket and, like the outlet 10, likewise forms a sleeve, which simplifies the connection of further pipe sections to the inlet 14 and the outlet 10. The inlet 14 is followed by an intermediate piece in the form of a pipe bend which connects the inlet 14 to an upright rain pipe 24, also referred to as downpipe, so that precipitation water is conducted from the rain pipe 24 into the sand trap.A dip tube 11 terminates at a distance above the bottom 3 and forms with its open lower end a lower outlet mouth 15. At its upper end the dip tube 11 has an inlet mouth 16 which has a larger diameter than the outlet mouth 15. With this collar 18, the immersion tube 11 is supported on a support ring 19 which projects inwardly 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 seal is loaded by the dead weight of the immersion tube 11 and thus tightly contacts the collar 18 and the support ring 19. In the exemplary embodiments shown, the seal 20 is fastened to the reducer 17, for example by being adhesively bonded to the reducer 17 or by being drawn onto the reducer 17 as a sealing ring under tension.The immersion tube 11 arranged asymmetrically in the housing 2 can be equipped with a safeguard against rotation, which is not shown in the drawing for reasons of clarity. The anti-rotation device has the effect that the immersion tube 11 can be accommodated in the housing 2 only in a predetermined angle of rotation range and, if appropriate, in only a specific angle of rotation position relative to the upright central axis of the housing 2. The anti-rotation device is designed in such a way that the immersion pipe 11 does not hang directly in front of the outlet 10 and obstructs the inflow to the outlet 10, but that it is arranged in the housing 2, for example, as can be seen from FIG. 2, namely at the greatest possible distance from the outlet 10.The immersion pipe 11 has a handle 21, which in the exemplary embodiment shown is designed as a handle and is fastened to the reducer 17. By means of the handle 21, the immersion tube 11 can be removed upward from the housing 2 after the cover 4 has been removed from the housing 2.In use, precipitation water flows from the rain pipe 24, which is connected to the inlet 14, into the housing 2, flows downwards and through the inlet orifice 16 into the immersion pipe 11, flows through the immersion pipe 11 and reaches at the bottom through its outlet orifice 15 from the immersion pipe 11 into a sludge space 22, in which the precipitation water and the solids transported therewith accumulate, which typically settle in the sludge space 22 as the water level rises. In FIG. 2, the water level is indicated by 13 and is shown at a height at which it has reached the lower edge of the outlet 10. Additionally, incoming rainwater will leave the sand trap 1 through the drain 10 and flow into the channel pipe 23, in particular as part of a rainwater or mixed water channel which is connected to the drain 10 via the intermediate pieces.If no further deposits enter the sand trap 1, the water level 13 is adjusted within the housing 2 at the height of the lower edge of the drain 10, as indicated in FIG. 2. A flow connection for gases, for example for air, between the outlet 10 and the inlet 14 through the immersion pipe 11 is interrupted by this water level. There is also no flow connection between the outlet 10 and the inlet 14 past the immersion tube 11, since the immersion tube 11 is closely connected to the housing 2 by means of the seal 20. Gases rising from the duct 23 therefore cannot enter the rain pipe 24.After removal of the cover 4, the immersion tube 11 can be gripped on the handle 21 and removed from the housing 2, so that the outlet 10 is now accessible from the upper end of the housing 2. In the case of maintenance work, tools can be introduced into the channel tube 23 through the outlet 10, which is facilitated by the inclined surface 12 which forms an introduction slope for such tools. In the case of a canal installation, this insertion bevel facilitates the insertion of a liner into the canal tube. If replaced or, particularly advantageously, added, the inclined surface 12 can be a tongue, which is not shown in the drawing and which projects into the interior of the housing 2 in the lower circumferential region of the drain 10.The invention is not limited to one of the above-described embodiments, but can be modified in many ways.All features and advantages which emerge from the claims, the description and the drawing, including structural details, spatial arrangements and method steps, can be essential to the invention both individually and in a wide variety of combinations.List of reference characters1 Sand trap 2 Housing 3 Base 4 Cover 5 Upper part 6 Lower part 7 Sleeve 8 Cover plate 9 Pipe socket 10 Outlet 11 Immersion pipe 12 Inclined surface 13 Water level 14 Inlet 15 Outlet opening 16 Inlet opening 17 Reducing piece 18 Collar 19 Support ring 20 Seal 21 Handle 22 Sludge chamber 23 Channel pipe 24 Rain pipe
Claims
Sand trap (1) which • is configured to be arranged in use in the flow path between a downcomer and a rainwater or mixing channel, • has a watertight housing (2), • has a connection opening in the housing (2) which is referred to as inlet (14) and connects to the downcomer in use, • has a connection opening in the housing (2) which is referred to as outlet (10) and connects to the channel in use and is arranged lower than the inlet (14), • has a sludge space (22) which is arranged lower than the outlet (10) and has a base (3), • has a dip tube (11), ◯ with an upper inlet orifice (16) which is arranged lower than the inlet (14) and higher than the outlet (10), ◯ and with a lower outlet orifice (15), An arrangement which is lower than the outlet (10) and above the bottom (3) of the sludge space (22), ◯ wherein the immersion pipe (11) connects at the top tightly to the housing (2), ◯ and wherein the immersion pipe (11) is configured below in such a way that it creates a flow path for precipitation water from the sludge space (22) to the outlet (10) inside the housing (2) and outside the immersion pipe (11), characterized in 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) can be rotated with respect to one another about an upright axis of rotation.Sand trap according to claim 1, characterised in that the immersion pipe (11) is arranged eccentrically in the housing (2) such that its distance from the connection opening in the housing (2) forming the outlet (10) is greater than from the wall section of the housing (2) opposite the outlet (10).Sand trap according to claim 1 or 2, characterised in that the immersion pipe (11) can be removed upwardly from the housing (2).Sand trap according to one of the preceding claims, characterized in that the immersion pipe (11) has a handle (21).Sand trap according to one of the preceding claims, characterized in that the upper part (5) and lower part (6) are each designed as upright tubular bodies, on which one tubular body a sleeve (7) is arranged at its end adjacent to the other tubular body, and the other tubular body projects into the sleeve (7).Sand trap according to one of the preceding claims, characterized in that the inlet (14) and / or the outlet (10) is formed as a pipe socket which extends away from the housing (2).Sand trap according to claim 6, characterised in that the pipe socket has an end designed as a sleeve.Sand trap according to claim 6 or 7, characterised in that the pipe socket of the drain (10) connects to the housing (2) at the top at an acute angle of more than 90°.Sand trap according to one of the preceding claims, characterized in that the upper end of the immersion pipe (11) is designed as a reducer (17).Sand trap according to one of the preceding claims, characterized in that the upper end of the immersion pipe (11) has an outwardly projecting, encircling collar (18) and lies with this collar (18) on a support ring (19), which runs inside the housing (2) and connects closely to the housing wall.Sand trap according to claim 10, characterised in that a seal (20) is arranged between the collar (18) and the support ring (19).Sand trap according to one of the preceding claims, characterized in that the immersion pipe (11) opens open at the bottom.A rain pipe arrangement comprising a downcomer intended to direct precipitation water downwardly from a collecting surface collecting the precipitation, in use, and a rainwater or mixed water channel referred to as a channel intended to receive the precipitation water supplied from the downcomer, in use, characterized a sand trap (1) according to any one of the preceding claims, • which is arranged in the flow path between the downcomer and the channel, • whose inlet (14) connects to the downcomer, • and whose outlet (10) connects to the channel and is arranged lower than the inlet (14).Kit for a rain pipe arrangement, having a rain pipe arrangement according to Claim 13, and having, in addition, a further component which can be inserted into the housing optionally in place of the immersion pipe, wherein this component has an inclination with respect to the longitudinal axis of the housing or is configured to form the inclination as a result of its installation position in the housing, in such a way that the inclination, in use, directs an object introduced into the housing from above into the outlet.Kit according to claim 14, characterised in that the additional component is configured to cover, in use, a bearing or sealing surface on which the immersion tube otherwise rests.