Connection unit for roof drainage with a connection frame

Abstract

The present invention relates to a connection unit (100) for roof drainage, comprising a connection section (110), a channel pipe section (120), a connection frame (150) and a sealing mat (130), wherein the sealing mat (130) has an opening, the edge surfaces (136) of which are held together with the connection frame (150) in the channel pipe section (120) and / or the connection section (120), wherein the connection section (110) and the channel pipe section (120) are formed monolithically from a first plastic and wherein the connection frame (150) is formed from a second plastic.

Description

[0001] The present invention relates to a connection unit for roof drainage according to the preamble of claim 1.

[0002] Connection units for roof drainage systems for round and rectangular water pipes are known in the prior art. Further relevant prior art is disclosed in the following documents: EP 1 145 012 A2, GB 1 491 111 A, DE 35 16 657 A1 and DE 77 03 110 U1.

[0003] The object of the present invention is to propose an improved connection unit for roof drainage.

[0004] This problem is solved according to the invention by a connection unit for roof drainage according to the features of claim 1. Advantageous embodiments are specified in the associated dependent claims.

[0005] The task is then solved by a connection unit for roof drainage, comprising a roof drain body, a connection frame, and a connection sleeve, particularly for a roof waterproofing membrane, wherein the connection sleeve for the roof waterproofing membrane has an opening whose edge surfaces are held together with the connection frame in the roof drain body. The connection frame comprises at least one reinforcing element, and the roof drain body is monolithically formed from a plastic by molding it onto the connection frame and the connection sleeve held by the connection frame.

[0006] A molded part can, for example, be injection molded. This creates an improved connection between the collar and the roof drain body. In addition to the connection between the roof drain body and the collar achieved by injection molding the roof drain body onto the collar's surface, the connecting frame provides a further seal between the collar and the roof drain body. Because the connecting frame also has recesses, preferably hole-like recesses, the plastic can penetrate these recesses during the injection molding process, further reinforcing the connection, particularly between the connecting frame and the roof drain body. This creates an interlocking effect with the injected plastic, reinforcing the attachment between the roof drain body and the connecting frame.Preferably, the cuff can be primed before the injection molding process to improve adhesion of the injected plastic. Particularly preferable is the application of a fleece to the cuff, resulting in an even tighter bond between the roof drain body and the cuff during injection molding.

[0007] The connecting frame is preferably perforated. Preferably, the roof drain body is monolithically formed from a first plastic material, and the connecting frame is formed from a second plastic material.

[0008] The connection unit is primarily used for wall connections to roof drainage systems, such as parapet drainage systems where a substantially horizontal sewer pipe penetration through the parapet leads to the roof drainage. The connection unit can also be used for other drainage situations where a connection sleeve is required.

[0009] The connecting collar for a roofing membrane is preferably made of plastic or bitumen and is ideally selected to match the roof covering. The connecting collar can be made of materials such as bitumen, PVC, FPO, ECB, or EPDM.

[0010] The roof drain body can advantageously be designed in the form of a flange or a pipe and include a transition section and a flange section. The transition section forms a region with a wall thickness that is preferably greater or increasing compared to the pipe section, wherein the transition section merges into the flange section in the area of ​​the connection frame, which serves, for example, for attachment to a parapet or support on a ceiling element.

[0011] In a further advantageous embodiment, the first end face of the connection frame, which faces inwards (roof side), is aligned flush with the top surface of the connection sleeve and / or set back by a maximum of a few millimeters. The end face of the connection frame and the top surface of the connection sleeve thus form a common (outer) plane.

[0012] In an improved embodiment, the roof drain body can have two or more parallel inner tubes, separated from each other at least along a portion of their length by one or more inner channel walls. The advantage of such an embodiment is that the roof drain body becomes significantly more stable and better able to withstand external forces.

[0013] In an improved embodiment, it can be provided that the roof drain body is formed monolithically from a first plastic, which is a foamed plastic, and wherein the connecting frame is formed from a second plastic, which is a non-foamed plastic, in particular an injection-molded plastic.

[0014] In a further, improved embodiment, it can be provided that the first and the second plastic is a polyurethane (PU) or a plastic mixture comprising PU, in particular a plastic mixture containing PU as the main component.

[0015] The terms "plastic," "plastic compound," and "material" are used synonymously here unless a distinction is explicitly made. In particular, "material" is understood to refer collectively to the plastics and plastic compounds mentioned herein, especially after their complete curing or drying. In contrast, "molding compound" is understood to mean the material liquefied under pressure or heat, as well as the material that is not yet fully cured or dried and / or possibly foamed, as used for the manufacture and production of the connection unit, especially for the production of the sewer pipe section and the roof drain body.

[0016] According to the invention, a plurality of connection channels are provided in the connection frame. These can be evenly distributed on the back of the connection frame. In an alternative embodiment, which is not part of the claimed invention, the reinforcement element itself is formed in a grid or lattice structure.

[0017] Preferably, the connecting channels are evenly distributed on the connection frame. In the case of a rectangular base structure of the connection frame, connecting channels are provided, in particular, on the longer width sections to protect these easily mechanically deformable sections against accidental or unintentional deformation. Preferably, the connection frame can also have a geometry that includes circular segments, and in particular, can even be circular. Transitions of linear sections of the connection frame with a rounded corner are preferably formed.

[0018] The cross-sectional geometry of the connecting channels and the connecting frame is not restricted and can be round, square, rectangular, polygonal, or any other shape. Advantageously, the corners or corner sections have a radius to reliably prevent adhesion and deposits.

[0019] Furthermore, the opening area or cross-sectional area spanned by the channel opening of the connecting channel can be inclined or slanted relative to the inner flow cross-section of the connecting channel and / or one of the end faces. The connecting channels can advantageously be designed as closed bores or channels, such as a blind bore. In an improved, alternative embodiment, at least one connecting channel can also be slotted in its longitudinal direction or have further openings transverse to its longitudinal axis, so that gas inclusions are reliably prevented and a high degree of cross-linking and stiffening to all adjacent cavities and surfaces is achieved.

[0020] The connecting channels thus form a reinforcement structure which, after the hardening of the molding compound, represents a very advantageous, permanent connection structure between the connecting frame and the material of the roof drain body.

[0021] According to the invention, the connecting channels have openings on both sides; thus, in this embodiment, at least a subset of the connecting channels have a channel outlet in addition to the channel opening. The major advantage of connecting channels that are open on both sides is improved wetting of the adjacent surfaces and reduced gas inclusion.

[0022] In this case, the connecting channels are advantageously designed as closed bores or channels, for example analogous to a through bore. In an improved, alternative embodiment, at least one connecting channel can also be additionally slotted in its longitudinal direction or have further openings transverse to its longitudinal axis.

[0023] According to the invention, the reinforcing element is a reinforcing lamella having a plurality of connecting channels. Analogously, a plurality of connecting channels can be arranged in at least one section of the reinforcing element.

[0024] According to the invention, the connecting frame comprises the following: a channel surface, a rear surface, a first end face at a first end side, and a second end face at a second end side, wherein the connecting frame spans the central flow axis (A). The channel surface of the connecting frame is understood to be the side facing the flow axis (A). Similarly, the rear surface or back side is understood to be the surface or side facing away from the flow axis (A). Advantageously, the channel surface of the connecting frame is smooth, and the transition to the angled first end face, which faces the roof, is rounded to facilitate optimal flow.

[0025] The channel surface and the back surface are designed to be continuous and / or circumferential.

[0026] The connection frame is advantageously designed and dimensioned such that the channel surface essentially represents the smooth continuation of the inner surfaces of the connected duct pipe section. The channel surface can be inclined by 0.5° to 5°, ideally by 1° to 2°, relative to the inner surface of the duct pipe section or the flow axis of the duct pipe section. According to the invention, the rear surface of the connection frame has at least one friction element along at least one partial length, against which at least one partial surface of the edge of the connection sleeve rests with its upper surface. Thus, during manufacturing and after installation, the connection sleeve is securely held in its position within the connection unit, even under mechanical stress such as expansion or maintenance work.

[0027] The friction element is advantageously designed as a lamella or a group of lamellae, which are particularly preferably arranged circumferentially on the rear side of the connection frame. When the liquid molding compound is injected or when a foamed molding compound expands, the edge surface of the connection sleeve is pressed against the friction element, which cuts or presses into the connection sleeve at least partially. This results not only in the adhesion of the material, particularly on the rear side of the connection sleeve, but also, in certain sections, in a positive fit between the friction element and the connection sleeve. The advantage of a closed lamellar structure of the friction element is that it prevents molding compound from penetrating between the friction element and the top surface of the connection sleeve during manufacturing, thus preventing the sleeve from separating from the friction element and weakening the mechanical connection between the friction element and the connection sleeve.

[0028] Advantageously, during manufacturing, the connecting sleeve is positioned with its surface against the friction element and / or a flank or side surface of the friction element in such a way that the back side is completely wetted by the material.

[0029] According to the invention, at least one groove section is formed on the rear surface between the reinforcing element and the friction element, wherein the outer edge of the edge surface of the connecting sleeve is arranged within the at least one groove section. Ideally, the groove section is a closed groove that is arranged circumferentially between the reinforcing element or its sections and the friction element or its sections.

[0030] In this context, the surface of the connection sleeve refers to the side that is exposed during installation and subject to the elements, i.e., wetted by rain, and also includes its continuation within the connection unit. Similarly, the back of the connection sleeve refers to the opposite surface. The "inner surface" of the connection sleeve refers to the portion of the surface located within the connection unit.

[0031] If the outer edge of the connecting sleeve's edge area lies within the groove section or against a flank of the friction element, it is ensured that uniform pressure is applied when pressing in the material or expanding a foaming material and that the connecting sleeve is not lifted off the friction element.

[0032] In a further, improved embodiment, the connection frame can be provided with a substantially rectangular base shape, comprising two width sections, two height sections, and four corner sections. It has proven particularly advantageous if the width-to-height ratio (W / H) is equal to or greater than 2, advantageously equal to or greater than 3, and ideally equal to or greater than 4. This allows for a very deep installation with a very large flow cross-section.

[0033] The corner sections on the channel side are advantageously designed as radii in the direction of travel, i.e., rounded.

[0034] Advantageously, the height of the second end face of the connection frame is less than the height of the first end face. The term "channel opening facing the end face" also includes a channel opening that is not, for example, located in the second end face of the connection frame, but rather set back towards the first end face, in particular a channel opening that is located in a reinforcement element set back towards the second end face and as part of a connecting channel there.

[0035] Advantageously, the second end face of the connection frame, which transitions into or rests against the channel pipe section, is contoured and has, for example, a toothed or wave structure, so that an improved connection with the molded material or the material is created.

[0036] In this way, during the manufacturing of the connection unit, particularly when connecting the connection frame to a roof drain body, molding compound can penetrate the connecting channels of all adjacent surfaces, forming a stable, internal retaining structure after hardening. This prevents the connection frame from being removed or detached without damage. Furthermore, this close bond creates a particularly tight seal, reliably preventing water from penetrating adjacent building components such as wall or roof elements.

[0037] The connecting frame itself is preferably a monolithic frame made from a single material, particularly as an injection-molded part. In an alternative embodiment, the connecting frame is composed of multiple parts, preferably two straight width sections, two straight height sections, and four corner sections, wherein the individual parts can be slotted together and / or glued.

[0038] In a further, improved embodiment, it can be provided that at least in the circumferential or circumferential direction, the rear surface has at least one friction element on at least one partial length, by means of which a connecting sleeve can be held clampingly against an adjacent surface.

[0039] The connecting unit is, in particular, the product of an advantageous manufacturing process or production sequence. It is manufactured using a one- or multi-part mold, comprising a positioning and guiding unit or a positioning and guiding section for receiving and / or attaching the connection frame and at least parts of the connection sleeve, in particular the adjacent edge surfaces to an opening in the connection sleeve, and at least one one- or multi-part forming area with an interior as a negative mold, for forming the roof drain body in the interior by means of the fillable, pressable and / or insertable forming compound.

[0040] In a first manufacturing step, an opening is made in the connecting sleeve, with an edge surface adjoining the opening, which is intended to be placed against the back of the connecting frame, in particular a friction element of the connecting frame.

[0041] The connecting sleeve and connecting frame are then inserted into a forming tool.

[0042] This can The connecting frame is connected to the connecting sleeve in its opening before being inserted into the mold, the connecting sleeve is pulled along by the insertion of the connecting frame into the positioning and guiding section of the mold and is thereby inserted and / or clamped in the mold, or the connecting sleeve is inserted with the edge area of ​​its opening into the positioning and guiding section and then the connecting frame is inserted.

[0043] After the insertion of the connecting sleeve and the connecting frame, a filling step takes place in which the molding material is poured into the molding area of ​​the molding tool and subsequently hardens.

[0044] Particularly with a very wide connection frame, it can be advantageous to support the connection frame until the molding compound has fully or largely hardened, in order to counteract permanent deformation. Thus, the mold can have a guide and spreading section that can be applied to at least a portion of the channel surface of the connection frame. In this way, deflection, especially of the wide section of the connection frame, in the direction of the flow axis due to the pressure of the molding compound is prevented until it hardens.

[0045] In this context, a "circumferential direction" is a "circumference direction" of any contour and is not to be understood restrictively. Thus, "circumferential direction" can be understood analogously to refer to any of the aforementioned non-circular geometries of the connecting frame.

[0046] Further details and advantages of the invention will now be explained in more detail with reference to an exemplary embodiment shown in the drawings.

[0047] They show: Figure 1: A perspective view of a connection unit as a sectional view; Figure 2: A perspective view of a connection unit according to... Fig. 1 as a sectional view with further reference symbols, Figure 3 a perspective view of the connecting frame as well as a detail view of a corner section, Figure 4 a detail view of the Fig. 2Figure 5A a perspective view of a connecting frame with a circular geometry and Figure 5Legs a perspective view of a connecting frame with a freeform shape.

[0048] In the Fig. 1 The connection unit 100 according to the invention is shown in isolation. It comprises a roof drain body 110, a connection frame 150, and a connection sleeve 130. The roof drain body also includes a channel pipe section 120. The roof drain body 110 and the channel pipe section 120 are monolithically formed from a single material, which in the example shown is a PU foam or an injection-molded PU plastic.

[0049] The Figure 2 The connection unit 100 shows according to the Fig. 1, with the roof drain body 110 (with channel pipe section 120), the connection frame 150 and the connection sleeve 130, the connection unit 100 being shown in its installed position. For this purpose, the roof drain body 110 is guided through a horizontal opening 204 in a vertical parapet 200. The connection unit 100 is positioned for a particularly deep installation position both on the parapet 200 and on a roof surface 202 of a roof element 208. The parapet 200 forms the upper end of a wall 206 of a building not described in detail. The connection unit 100 is designed here as a rectangular scupper.

[0050] The roof drain body 110 has a flanged section 112 and a transition section 114, the flanged section 112 being designed and configured for partial attachment to the parapet 200 and for fastening there. The transition section 114 surrounds the channel pipe section 120 of the roof drain body 110 and is designed and configured for connection to it.

[0051] Furthermore, the connection unit 100 has an upper leg 140, a lower leg 142, and a transition section 144 arranged between them. In the installation situation shown, the Figure 1 , 2 and 4The upper leg 140 is essentially vertical and aligned along the z-axis. The upper leg 140 comprises the flange section 112 of the roof drain body 110, a portion of the connection sleeve 130, and the connection frame 150, thus forming the inlet opening of the sewer pipe section 120. The lower leg 142 of the connection unit 100 comprises the elements shown in a similar manner, but in the illustrated embodiment, it is inclined at approximately 90° and rests on the roof surface 202 or on a roofing membrane 178 located thereon. The roofing membrane 178 is indicated by a double dashed line. In the illustrated embodiment, the roofing membrane 178 is a plastic roofing membrane or a bitumen membrane. In this case, the roofing membrane 178 is made of the same material as the connection sleeve 130. The connecting sleeve 130 is designed or made of such a material that it can be glued onto or fused to the roofing membrane 178.The transition section 144 is designed as a soft radius, which transitions from the first, upper leg 140 into the second, lower leg 142 and extends below the connecting frame 150 in the direction of the y-axis.

[0052] The sewer pipe section 120 has a horizontal ceiling wall 122, a parallel floor wall 124, and two perpendicular side walls 126, of which only the outermost side wall 126 is shown. A central or partition wall 127 lies in the front of the image plane, within which the vertical section plane of the illustration lies. Reference numeral 102 indicates the inner side, which lies on the roof side or in the area of ​​the roof surface, and reference numeral 104 indicates the outer side, which lies on the side of the sewer pipe section 120 or on the back of the parapet 200.

[0053] The connecting sleeve 130 has an unspecified opening, the edge surface 136 of which is clamped into the roof drain body 110 by means of the connecting frame 150 via the friction elements 176 therein, as shown in particular in the Fig. 4 The connection sleeve 130 is shown in detail. It has a top side 132 and a back side 134, with the top side 132 facing away from the flange section 112 of the roof drain body 110 and exposed to the elements. The back side 134 of the connection sleeve 130 faces the flange section 112 and rests on the roof element 208.

[0054] The inner surface of the bottom wall 124 transitions largely without a step or edge into the channel surface 152 of the connection frame 150, wherein the bottom wall 124 or the channel pipe section 120 is slightly tilted by 0.5° to 2.5° relative to the channel surface 152 of the connection frame 10 in order to provide a slope for the roof water to be drained when the lower channel surface 152 is installed horizontally in the channel pipe section 120.

[0055] In the Fig. 3The freestanding connection frame 150 is shown, comprising two width sections 160 with width B, two height sections 162 with height H, and four corner sections 164. A Cartesian coordinate system is shown for ease of description. Here, the x- and y-axes define a horizontal plane, and the z-axis represents the vertical axis. As explained above, this is an exemplary, typical orientation and installation position; other installation positions are not shown. The double arrow symbolizing width B runs parallel to the y-axis, the double arrow symbolizing height H runs parallel to the z-axis, and the arrows symbolizing the depth T of the connection frame run parallel to the x-axis. Finally, the flow axis A is essentially parallel to the x-axis, and any inclination that may be present will not be described or considered further here.

[0056] The ratio of width B to height H in the illustrated version of the Figure 3 The ratio is 4:1. The connection frame 150 defines a flow cross-section (without reference numeral) on which the flow axis A is perpendicular. The channel surface 152 of the connection frame 150 forms the inner surface that is wetted by the flowing water. The rear surface 154 projects outwards and is contoured. Furthermore, the connection frame 150 has a first end face 156 and a second end face 158. In the completed connection unit 100, the second end face 158 faces the channel pipe section 120 of the roof drain body 110, and the first end face 156 is located on the opposite side, facing the roof surface or the inner side 102. An end surface 166 (not shown) is located on the first end face 156, and a second end surface 168 is located on the second end face 158.

[0057] The connecting frame 150 has a multitude of connecting channels 170. These connecting channels 170 are distributed across the entire connecting frame 150; only the corner elements are free of such connecting channels 170. In a typical installation position, the flow direction R is parallel to the flow axis A and runs from the first end face 156 across the channel surface 152 into the channel section 120.

[0058] As particularly evident in the detailed presentation of the Figure 3As can be clearly seen, the back surface 154 is highly contoured and features a friction element 174 and a reinforcement element 176, with a groove section 172 arranged between the friction element 174 and the reinforcement element 176. The friction element 174 is formed from a group of three fixing lamellae that encircle the entire back surface 154. Similarly, the reinforcement element 176 is designed as a circumferential reinforcement lamella. The fixing lamellae of the friction element 174 have two mutually inclined side flanks and an upper cutting edge. The reinforcement lamella 176 has an inclined flank on one side and an outer cutting edge. Here, the cutting edge of a lamella refers to a taper at the free, outer end, in contrast to the wider base (in the x-axis direction) of the lower end of the respective lamella.

[0059] The maximum material height M in the direction of the z-axis is that of the reinforcing lamella 176, which in its installed position projects into the transition section 114 of the roof drain body 110 ( Fig. 2 The material height M of the friction element 174 from the group of three lamellae is slightly less in order to accommodate the edge surface 136 of the connecting sleeve 130 to be held, as also particularly in Fig. 4 is shown in detail.

[0060] The second end face 168 is essentially parallel to the z-axis and has approximately 0.5 times the maximum material height. The connecting channels 170 are incorporated into the reinforcing lamella 176.

[0061] As in the Fig. 2 already identified, shows Figure 4 also in the representation of a vertical section details in the area of ​​the second, lower leg 142 and in particular in the area of ​​the transition section 114 of the roof drain body 110.

[0062] The section plane passes through a connecting channel 170 in the lamellar reinforcement element 176, so that the upper, free end of the reinforcement element 176 appears as a triangle. The connecting channel 170 has openings on both sides (not shown) and is completely filled with material, in this case a polyurethane foam. The connecting channel 170 shown in the section is open on two sides. One opening of the connecting channel 170 is located on the side of the second end face 158, and the second opening leads into the groove section 172.

[0063] The connecting sleeve 130 projects into this groove section 172, which in this case is a fully circumferential groove, with its outer edge surface 136. The inner edge surface 136 is held by the three lamellae of the friction element 174, with the material in the transition section 114 being pressed against the inner back surface 134 of the connecting sleeve 130, thus pressing the inner back surface 134 against the friction element 174 under force. During manufacturing, a liquid or pasty molding compound was applied to the flank of the groove section 172, which the groove section shares with the friction element 174, in the area of ​​the friction element 174, in order to improve the fit and sealing properties with the connecting sleeve 130. This is an optional feature.

[0064] The connecting channels 170 have a rectangular cross-section and are designed as channels open on two sides. They have a channel opening on the side of the second end face 168 and a channel outlet on the side facing the groove section or the friction element 174. In other words, a molding material, such as a polyurethane foam, entering at the channel inlet can expand through the connecting channel 170 and enter the groove section from the channel outlet, thus wetting the opposing flanks of the reinforcing lamella 176 and the opposing fixing lamella of the friction element 174. The circumferential lamellar structure of the friction element 174 and the reinforcing element 176 on the rear surface 154 ensures that the corner sections 164 are also reliably wetted with the molding material in the direction of rotation.

[0065] As described above, the edge surface 136 of the connecting sleeve 130 ends in the groove section 172 and ideally rests completely against the connecting frame 150 with its inner surface. During the manufacturing step, the molding compound is fed in such a way that it only wets the connecting sleeve 130 from the rear side 134, thus pressing it against the connecting frame 150 or the friction element 174.

[0066] In Figure 5 A and B Perspective views of a 150 mm connection frame with different geometries are shown. Figure 5A It is a 150 mm connection frame with a circular shape and in Figure 5B This is a 150 mm connection frame with a freeform shape. This freeform shape is made from the Figure 5BIt has cross-sectional sections in different planes. Depending on the geometry of the parapet or other design considerations, it may be advantageous to design the connection frame to be round, square, rectangular, polygonal, or in some other way, and to design it in one, two, or more planes. Reference symbol list

[0067] 100 Connection unit 102 Inside 104 Outside 110 Roof drain body 112 Flange section 114 Transition section 120 Channel pipe section of the roof drain body 122 Ceiling wall 124 Floor wall 126 Side wall 127 Center or partition wall 130 Connection sleeve 132 Top 134 Back 136 Edge 140 Upper leg 142 Lower leg 144 Transition section 150 Connection frame 152 Channel surface 154 Rear surface / side 156 Front side, first (roof side) 158 Front side, second (channel side) 160Latitude section 162Height section 164Corner section 166Front face, first (roof side) 168Front face, second (channel side) 170 Connecting channel 172 Groove section 174 Friction element 176 Reinforcing element / lamella 178 Roofing membrane 200Attica 202Roof area 204Opening 206Wall 208Roof element A Flow axis B Width H Height M Material height R Flow direction T Depth

Claims

1. A connection unit (100) for roof drainage, comprising a roof drain body (110), a connection frame (150), and a connection collar (130), wherein the connection collar (130) has an opening whose edge surfaces (136) are held in the roof drain body (110) together with the connection frame (150), wherein the roof drain body (110) is formed monolithically from a plastic by molding a molding material against the connection frame (150) and the connection collar (130) that is held by the connection frame, the connection frame (150) having the following: a channel surface (152), a rear surface (154), a first end surface (166) on a first end face (156), a second end surface (168) on a second end face (158), the connection frame (150) spanning a central axis of flow (A), wherein the channel surface (152) is arranged on the side facing toward the axis of flow (A) and the rear surface (154) is arranged on the side facing away from the axis of flow (A), characterized in that the connection frame (150) comprises at least one reinforcing element (176), and the reinforcing element (176) is a reinforcing fin which has a plurality of connecting channels (170), and wherein the rear surface (154) of the connection frame (150) has at least one friction element (174) on at least one sublength against which at least a subsurface of the edge surface (136) of the connection collar (130) bears with its upper side (132), wherein at least one groove section (172) is formed on the rear surface (154) between the reinforcing element (176) and the friction element (174) and wherein the outer edge of the edge surface (136) of the connection collar (130) is arranged within the at least one groove section (172), and wherein the connecting channels (170) are embodied as channels which are open on two sides and have a channel inlet on the side of an end face (168) and a channel outlet on a side facing toward the groove section (172), so that molding material entering at the channel inlet expands through the corresponding connecting channel (170), enter the groove section (172) from the channel outlet, and wet the opposing flanks of the reinforcing fin and a fixing fin of the friction element (174) in order to provide a reinforced connection between the roof drain body (110) and the connection frame (150).

2. The connection unit (100) according to claim 1, characterized in that the roof drain body (110) is formed monolithically from a first plastic, which is a foamed plastic, and the connection frame (150) is formed from a second plastic, which is a non-foamed plastic, in particular an injection-molded plastic.

3. The connection unit (100) according to claim 1 or 2, characterized in that the plastic is a polyurethane (PU) or a plastic mixture which comprises PU, in particular a plastic mixture which contains PU as the main component.

4. The connection unit (100) according to any one of the preceding claims, characterized in that the cross section of the connection frame (150) is round, square, rectangular, polygonal, and / or has circular segment-like sections.

5. The connection unit (100) according to any one of the preceding claims, characterized in that the connection frame (150) has a substantially rectangular basic shape, with two width sections (160), two height sections (162), and four corner sections (164).

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