DE4133756A1 - ROOF DRAINAGE SYSTEM - Google Patents

Abstract

A roof drainage system comprising roof gutter (14), discharge housing (18), load-bearing unit (16) and downpipe (20) is assembled by snap-connecting means. <IMAGE>

Description

The invention relates to a roof drainage system, comprising at least one gutter at intervals along its length considerable horizontal longitudinal extent through support units is attachable to the roof structure and at least one the gutter adjoining drainage facility, where possible Licher an essentially vertical downpipe connects.

In the conventional design of such a roof drainage the support system on the roof structure regularly fixed in the form of gutter hooks. Then who the successive shots of the gutter into the gutter inner hook inserted and by bending operations of bendable Fasten the gutter hook fasteners with the tinsmith increases. Drainage boxes are usually attached to the channels, from which the water falls either in free fall or - mei  Mostly - through a down pipe to a sewer system in the ground is directed. The drain boxes are manufactured with mounting tabs or the like, which after the installation of the drain boxes on the downward External profile of the channels around the top edge of the channel from the plumber be bent so that the drain boxes then with the respective Gutter shot are firmly and sufficiently tightly connected.

If a downpipe is connected, this downpipe becomes the rule moderately composed of conical shots. The so educated Downpipe is secured by pipe clamps with wall anchors respective building secured.

The use of plumbing work when assembling one Roof drainage system is large and expensive to build the Roof drainage system due to significant labor costs.

The invention has for its object the parts and in particular especially the standard parts of a roof drainage system stalten that the use of tinsmith work during assembly and if necessary, when repairing the roof drainage system is significantly reduced.

To solve this task, various suggestions are under which spreads to different areas of the roof attach system.

Attach the gutter to the roof already on the roof Stigen carrier units can be significantly simplified be that the gutter on the support unit by at least a snap connection can be established.

Regardless of the shape of the gutter profile, this can be done Snap connection is easiest between a snap profile  an upper gutter edge and a snap element of the Trä manufacture the unit.

The snap profile is made for aesthetic reasons, but also from Stability reasons and in terms of ease of manufacture and releasability of the respective snap connection preferably from one out and down and then towards that Gutter inside to angled edge strips on one side Chen boundary wall of the gutter. With one Training of the snap profile, the carrier unit with a Carrier surface to be carried out in the assembled state an associated lateral boundary wall of the gutter abuts and to the space between this side Boundary wall and the associated snap profile, while a snap hook is attached to the support surface, the one with the angled towards the gutter interior Edge strip in snap connection occurs when the respective Boundary wall of the gutter placed on the support surface becomes. The installation and manufacture of the Snap connection can be made even easier by the fact that Snap hooks and / or one on the edge strip Introductory slope is provided.

To the full support of the respective side boundary wall not to hinder the gutter on the support surface recommended that the snap hook on the side away from the gutter the support surface is attached. Since the carrier surface is normal is moderately formed by a thin sheet-like component the engagement of the snap due to the wall thickness of this component hook behind the profile-forming edge strips of the respective Boundary wall of the gutter hardly hindered.

The snap hook is preferred in the region of a recess attached to each carrier surface. This eases an ela  static deformation of the snap hook in the event that the Gutter removed from one or more support units should be taken.

The gutter is particularly easy to assemble, if the carrier unit has two carrier surfaces, which are close to the profile of the gutter underside and if these two support surfaces each on a boundary wall of the Gutter attached to each with a snap connection Enter the snap profile at the top of this boundary wall. Here can the interlocking parts of the snap connections be essentially identical and be designed as further indicated above.

The drainage system according to the invention can be particularly design with gutters that have an essentially V- have shaped underside profile; in this case the Carrier unit with two of this V-shaped profile approximately fitted carrier surfaces.

The V-shaped profile of the gutter is independent of the type of attachment by means of snap connections an essential Chen progress over the state of the art and should therefore independent of the assembly using a snap connector enjoy protection. So far, gutters have usually been included semi-cylindrical profile occasionally as well as so-called Box gutter parts with a rectangular profile. In both cases len is the water-bearing sole of the inner profile ratio moderately flat, so that there is a flowing water flow ratio is moderately wide and shallow. So far this has been desired viewed because of a flat sole profile favorable transport conditions with regard to the gutter foreign body expected through the respective trickle. It has been shown that this expectation does not match the actual  Did not correspond to conditions and it was now surprising found that with V-shaped profiling Gutter because of the then even with low water flow foreign bodies, such as leaves, can be removed more reliably, even if the Channel has a slight slope.

With the usual roof drainage systems, erhebli handwork necessary to complete one of the construction plans Herein specified slope reasonably even over a be agreed to distribute gutter length. It is often necessary for this dig the gutter hooks after they are already on the roof structure tion are appropriate to bend and / or compensation layers between the gutter hook and gutter. In contrast, will proposed here that the carrier unit one for attachment formed on the roof structure of the first support part has and also one for attachment to the first carrier part trained, adjustable with respect to the first carrier part, especially higher adjustable gutter-side second door has part with which the gutter can be connected.

By adjusting the second support part against which he Most support part is the setting of a constant slope considerably simplified along a gutter. It should it cannot be ruled out that an essentially ho horizontal adjustment of the second support parts compared to the one Most carrier parts is applied to irregular hori to compensate for the zonal course of the gutter path possible. Height adjustment and side adjustment can be done with can be combined. As a rule, the height adjustment in practice are of greater importance. This adjustment Availability of the two parts of a carrier unit to each other always applicable regardless of how the befe the roof gutter in the support units takes place and should  therefore be protected regardless of the type of attachment. A particularly simple height adjustment can be done by means of an elongated bolt connections between the two carrier parts len reach.

It was mentioned at the beginning that gutters in usually be fitted with drain boxes to keep the water out the gutter either in free fall or by means of one To be able to derive the downpipe. Attention has also been drawn to the previous difficulties in the attachment of a Abflußge to a gutter. To have an assembly time and to further create cost-saving remedies hit that the drain housing with the gutter through minde least a snap connection is connectable. The application of the Snap connection principle between drain housing and gutter brings significant advantages, no matter what the shape Gutter and what type of attachment between gutter and Carrier units is used. That's why the snap should connection principle between drain housing and gutter like therefore enjoy independent protection.

The snap connection between drain housing and gutter leaves are similar or identical to the snap connection between gutter and support unit, because the drain housing in an analogous manner to the system between the carrier unit and Gutter lies against the underside of the gutter profile. The Above mentioned possibilities for the formation of snap connection Therefore, between the support unit and gutter also apply for the connection of drain housing and gutter. In particular dere a drain housing with at least one snap ment, which is for the connection with one Snap profile on the upper edges of two lateral borders walls of the gutter is formed. The snap elements can  similar to the snap elements described above on the Carrier units can be designed as snap hooks.

A particularly easy to manufacture form of the connection housing you get if you do this with two in the longitudinal direction of the Gutter spaced, the outer profile of the gutter correspond trimmed end walls and these end walls together connecting connecting walls, this connection tion wall essentially an axis to the gutter profile form parallel prism. The drain housing thus obtained forms then with the outer profile of the gutter a substantially ge closed drainage chamber. The drain housing can be stabilized and at the same time be better sealed against the gutter, if between the end walls of the drain housing as a supplement The prism's edge flanges run along the outer profile the gutter.

The water transfer from the gutter to the drain housing can in such an embodiment by simple drainage tion opening of the gutter in the coverage area of the Abflußge be accomplished. This opening does not need to be special design, apart from, of course, that their edges should be designed so aerodynamically that none Foreign bodies are retained on them. A manufacturing technically, but also aesthetically preferred form tion of the drain housing is obtained if this in an ortho gonal to the gutter longitudinal extension a cut in has essential V-shaped profile.

At least one of the connecting walls of the drain housing can then connect a drain pipe, which for connection with a downpipe can be formed, but also for example can be shaped as a gargoyle. From the above in the Hin look at the transport conditions for foreign objects mentioned  For reasons it is recommended that the drain pipe is also in the cross cut is triangular and shaped accordingly triangular opening of the respective connecting wall connects. The triangular opening of the connecting wall is preferred formed so that a triangle tip in the sole area of the Ab river housing is and one of these triangle tip opposite side essentially parallel to the gutter length Extension runs at a distance from the sole area.

If you want to connect a downpipe to the drain pipe, you can this depending on the design of the building either from the sole lead the gutter vertically and straight down. Is but at the transition between the roof structure and the outer wall of a building provided a ledge, and you want the case pipe as close as possible to the outer wall despite this ledge gen, so you can train the drain pipe as a pipe bend the one with a side wall of the drain housing a horizontal directional component transverse to the longitudinal direction the gutter is sloping downwards and then into the vertical is redirected. Such a pipe elbow can be easily through Welding two pieces of pipe win, the un at their ends cut the acute angle against the respective pipe axis are.

The best used so far from conical shots Downpipes can be sequenced insert the downpipe shots regularly during initial assembly attach easily. But the biggest difficulties are if a single shot is to be exchanged, be it because it is damaged, be it because of the exterior behind it wall piping or painting work carried out should be. To the difficulties of the exchange or the to remove temporary acceptance of a downpipe shot, it is therefore further proposed that the downpipe by itself  not overlapping downpipe shots especially with triangle is formed according to the cross section, the mutually facing ends are at a distance from each other, and that to connect them the facing ends provided telescopic connectors are, each with a larger diameter end portion one of the facing ends of the downpipe shots reach around the outside and each with a smaller diameter end intervene in the other end or vice versa.

This idea is also independent of the design and description the gutter and the design of the drain housing and the cross-sectional shape of the downpipes. This thought too should therefore enjoy independent protection. The initial construction of a downpipe designed in this way and the exchange of a case Pipe shot becomes particularly easy when the telescopic connection each with a fastening element for fastening are formed on a building part. You can then in the Construct in such a way that the cross-sectionally larger end section Weil upwards and the smaller diameter end section each because it is directed downwards and that one between two teles downpipe shot arranged with its ever because lower end refer to a transition shoulder between the different end sections of the associated Teles creates connector, but this case for disassembly pipe shot of this between two successive Teles Coupling connectors can be raised so far that its lower Down pipe end over the upper end of the associated telescope binding piece comes to rest and then the downpipe shot un the lateral swiveling of its lower end from the lower ren end portion of the associated upper telescopic connection is peelable.

In such an embodiment, the downpipe shots are on secured in their respective position by gravity. Around  but also in the event of improper influence, for example through playing Children to avoid defects, it is further suggested that the telescopic connector and / or an associated fastener means for fastening to the structural part with a Clamping cuff is connected, which to the telescope connecting piece downpipe shots above each or below the upper or lower end of the telescope engages around the binding piece and against with a tension lock the adjacent downpipe shots can be tensioned.

The construction measures described on Trä units, gutters, drain boxes and downspouts apply basically, regardless of the material the individual components are made. He is preferred roof drainage system according to the invention as far as possible Stainless steel parts built. These are due to their elasticity properties for the production of the snap connections particularly suitable. They are easy to weld and ver avoid the environmental technology that occurs with copper roofing parts logical problem of the discharge of sulfate contaminated sewage ser.

The accompanying figures explain the invention using a Embodiment. They represent:

Figure 1 is an overall view of a roof drain system according to the invention on a building.

Figure 2 shows an explosion assignment of gutter, drain housing and drain connector.

Figure 3 is a section through a connection between the gutter and drain housing.

Fig. 4 is an exploded assignment of carrier unit and gutter;

Figure 5 is a section through a joint between a carrier unit and a gutter.

Fig. 6 is a view of a down pipe and

Fig. 7 shows the detail of a connection point between two successive downpipe sections.

An outer wall of a building is designated by 10 in FIG. 1 and the roof structure by 12 . On the lower edge of this roof construction 12 , a gutter 14 is installed and carried by carrier units 16 .

A drain housing 18 is attached to the gutter 14 , to which a downpipe 20 connects.

Figs. 2 and 3 show the compound of the gutter 14 is to the drain box 18.

The gutter 14 is designed with a V-profile, which has an opening angle of 45 ° to 120 °, preferably about 60 °. This gutter 14 is made of stainless steel sheet by bending Herge and is composed of two boundary walls 14 a. On each of the boundary walls 14 a, an edge strip 14 c is formed into a snap profile in the region of the upper edge 14 b. This snap profile, also called 14 c for the sake of simplicity, is composed of a downward-facing partial strip 14 ca and an inward-pointing partial strip 14 cb. On this gutter 14 , the drain housing 18 is suspended by snap elements 18 e.

The drain housing is formed of V-shaped end walls 18 a, which have in the longitudinal direction of the gutter 14 and distance b by connecting walls 18, 18 c and 18 d peripheral flanges are connected together. The connecting wall 18 b, 18 c and edge flanges 18 d can each be connected in one piece and be butt welded to the end walls 18 a. On the connecting walls 18 c, the snap elements 18 e are riveted in the form of snap hooks or fastened by spot welding. The snap hooks have instruction bevels 18 f at their upper ends.

To attach the drain housing 18 , this is pushed onto the gutter 14 from below, so that the contact flanges 18 d approach the boundary walls 14 a. The snap hooks 18 e slide with their bevels 18 f over the inward edges of the partial strips 14 cb and ra most behind them, so that the edge flanges 18 d abut against the boundary walls 14 a. So that the connector housing 18 is attached to the gutter 14 .

In the sole area 14 f of the gutter 14 , an opening 14 g is seen before, which is covered by the drain housing. A drain chamber 22 is delimited between the gutter 14 and the drain housing. This drain chamber is followed by a cross-sectionally triangular drain pipe 24 , which extends somewhat obliquely downwards perpendicularly to the channel axis, as shown in FIG. 2. This drain pipe 24 is butt welded to the boundary wall 18 b and is communicated with a drain opening 18 h, the tip 18 i of which is near the sole region 18 k and whose upper edge 18 l runs parallel to the gutter axis. The drain pipe 24 is combined with another pipe section 26 to form a pipe bend 24 , 26 to which a down pipe can be connected. This downpipe will be discussed later.

First, however, the fastening of the gutter 14 by means of the support units 16 is discussed. A carrier unit consists, as can be seen from FIGS. 4 and 5, of two carrier parts 16 a and 16 b. The carrier part 16 a is formed by a bent sheet metal, which mounting holes 16 from for fastening to the roof structure and in its lower angled area has a threaded bolt 16 ac. The Trä gerteil 16 b is formed from a single sheet metal strip ba with the support surfaces 16, 16 bb, a top flange 16 bc, a rear wall 16 bd and a bottom part 16 be which collides region 16 bf with the soles and optionally welded. In the rear wall 16 bd an elongated hole 16 bg is provided, which can be inserted over the threaded bolt 16 ac. Then a nut can be screwed onto the threaded bolt 16 ac in order to clamp the rear wall 16 bd with the carrier part 16 a. After loosening the nut, a height adjustment of the carrier part 16 b relative to the carrier part 16 a is possible; To prevent rotation of the carrier part 16 b relative to the carrier part 16 a, guide flanges 16 bh are provided on the former.

On the support surfaces 16 ba and 16 bb windows 16 bi are clicked out. On the outer sides of the support surfaces 16 ba and 16 bb, ie on the sides remote from the increasing groove 14 , snap hooks 16 bl are riveted or dotted. This snap hook 16 bl grab during sinking of the gutter 14 in which the carrier surfaces 16 ba and 16 bb formed V-profile towards ter cb of the snap profiles 14 c, so that the gutter 14 len against unintentional lifting out the Trägertei the partial strips 14 16 b is secured. Snap-in is also facilitated here by the 16 bm instruction bevels. The snap hooks 16 bl are slightly curved and pretensioned in the sense of lifting off from the carrier surfaces 16 ba and 16 bb. If the gutter 14 to be released from the support part 16 b, so you can solve the Schnappver connections by pressing with a tool against the snap hook 16 bl and at the same time the gutter 14 to.

The height adjustment of the support part 16 b is still possible after inserting the gutter 14 , since the nut 16 ad to be screwed onto the threaded bolt 16 ac is still accessible even after the gutter 14 has been placed on it.

In Fig. 6 and 7, the drop tube 20 is now shown in detail, which can be connected to the pipe bend 24, 26 in FIG. 2. This downpipe 20 consists of several prismatic, not tapered sections 20 a, 20 b and 20 c, which have a triangular cross section. Between successive shots 20 a to 20 c, telescopic connecting pieces 28 are provided, each of which has an upper section 28 b for sliding over the downwardly extending downpipe section 20 a or 20 b and a downwardly directed smaller section 28 a for insertion into a downward section subsequent case have pipe shot 20 b or 20 c. The upper sections 28 b are each attached to a mounting flange 30 of a wall anchor 32 by spot welding 34 . During assembly, the wall anchors 32 are placed at intervals that are somewhat larger than the lengths of the downpipe sections 20 a to 20 c. Then the individual shots are placed individually, namely the shot 20 b is set so that its lower edge 20 ba sits on a shoulder 28 c, which connects the two sections 28 a and 28 b of the respective telescopic connector 28 with each other. Before that, however, the upper end 20 bb over the associated section 28 a must be moved up until the lower end 20 ba of the shot 20 b can be pivoted over the upper edge 28 d in alignment with the axis of the telescopic connector 28 . Only then is the case, pipe section 20 may b in the direction of the shoulder 28 are lowered c. If this stands on the shoulder 28 c, the upper end 20 bb of the downpipe section 20 b still encompasses the lower cross-section-reduced portion 28 a of the upwardly adjacent telescopic connection element 28 . So that the downpipe section 20 b is secured above and un th against lateral evasion. A removal of a downpipe shot 20 b is possible, however, after it has been raised again so far that its lower end 20 ba has reached the upper edge 28 d of the telescopic connecting piece 28 and then swung out laterally with its lower end and can be pulled off downwards. The drop pipe sections 20 must, of course, a b of the telescopic connecting pieces 28 have an appropriate clearance with respect to the lower portions 28 to allow lateral swing of the respective bottom weft ends.

A cuff 36 , which is shown in FIG. 7, serves to prevent individual downpipe shots being deliberately removed. The sleeve is composed of the fastening flange 30 and which is applied with edge flanges 38 a against the mounting flange 30 and b by means of locking bolt 38 is secured to the mounting flange 30 the Man schettenwinkel 38 in FIG. 6. The edges 38 c of the cuff angle 38 lie against the adjacent shots 20 b and 20 c. At medium height, the cuff tenwinkel 38 , as shown in FIGS . 6 and 7, bulged so that it overlaps the telescopic connector 28 . Due to the clamping effect of the cuff angle 38 , the downpipe shots are secured against lifting out of the respective telescopic connection piece 28 .

All parts of the roof drainage, with the exception of the Rastbol zen 38 b, can be made of stainless steel. A production from any other material is conceivable, especially from copper sheet or plastic.

Claims (26)

1. roof drainage system comprising at least one gutter ( 14 ) which can be fastened at intervals along its essentially horizontal longitudinal extent by support units ( 16 ) to the roof structure ( 12 ) and at least one drain device ( 18 ) adjoining the gutter ( 14 ) , which may be followed by a substantially vertical downpipe ( 20 ), characterized in that the gutter ( 14 ) on the support unit ( 16 ) can be fixed by at least one snap connection ( 16 bl, 14 c). 2. Roof drainage system according to claim 1, characterized in that the at least one snap connection ( 16 bl, 14 c) between a snap profile ( 14 c) on a gutter edge ( 14 b) and a snap element ( 16 bl) of the carrier unit ( 16 ) can be produced is. 3. Roof drainage system according to claim 2, characterized in that the snap profile ( 14 c) from an outward and downward and then towards the gutter interior to angled edge strips ( 14 c- 14 cb) a lateral boundary wall ( 14 a) Gutter ( 14 ) is formed. 4. Roof drainage system according to claim 3, characterized in that the support unit ( 16 ) has a support surface ( 16 ba), which is in the assembled state on an associated lateral boundary wall ( 14 a) of the gutter ( 14 ) and to the space between this lateral boundary wall ( 14 a) and the associated snap profile ( 14 c) indicates that and on the support surface ( 16 ba) a snap hook ( 16 bl) is attached, which with the angled towards the gutter edge strips ( 14 c- 14 cb ) comes into snap connection, an insertion bevel ( 16 bm) being provided on the snap hook ( 16 bl) and / or on the edge strip ( 14 c- 14 cb). 5. roof drainage system according to claim 5, characterized in that the snap hook ( 16 bl) is attached to the gutter side of the support surface ( 16 ba). 6. roof drainage system according to claim 5, characterized in that the snap hook ( 16 bl) in the region of a recess ( 16 bi) of the support surface ( 16 ba) is attached. 7. Roof drainage system according to one of claims 2 to 6, characterized in that the carrier unit ( 16 ) has two carrier surfaces ( 16 ba, 16 bb), each of which is attached to a boundary wall ( 14 a) of the gutter ( 14 ), a snap connection ( 16 bl, 14 c) each with a snap profile ( 14 c) on the upper edge ( 14 b) of these boundary walls ( 14 a). 8. Drainage system in particular according to one of claims 1 to 7, characterized in that the roof gutter ( 14 ) has a substantially V-shaped profile and that the carrier unit ( 16 ) two this V-shaped profile approximately adapted support surfaces ( 16 ba, 16 bb). 9. roof drainage system, in particular according to one of claims 1 to 8, characterized in that the support unit ( 16 ) has a for mounting on the roof structure ( 12 ) formed first support part ( 16 a) and also one for attachment to the most support part ( 16 a) trained, compared to the first support part ( 16 a) adjustable, in particular higher ver adjustable gutter-side second support part ( 16 b) with which the gutter ( 14 ) can be connected. 10. roof drainage system, in particular according to one of claims 1 to 9, characterized in that the gutter ( 14 ) is assigned a drain housing ( 18 ) which is adapted to the outer profile of the gutter, and that this drain housing ( 18 ), with the gutter ( 14 ) by at least one snap connection ( 18 e, 14 c) is bindable ver. 11. Roof drainage system according to claim 10, characterized in that the drain housing ( 18 ) is equipped with at least one snap element ( 18 e), which with a to the upper edge ( 14 b) of a boundary wall ( 14 a) of the gutter ( 14 ) attached snap profile ( 14 c) can be connected, in particular with a snap profile ( 14 c), which is also intended and suitable for connecting the gutter ( 14 ) with a support unit ( 16 ). 12. Roof drainage system according to claim 11, characterized in that the drain housing (18) each with at least one snap element (18 e) for the connection with a respective snap profile (14 c) on the upper edges of two Begren (14 b) wetting walls (14 a) the gutter ( 14 ) is formed. 13. Roof drainage system according to one of claims 10 to 12, characterized in that the drain housing ( 18 ) two spaced in the longitudinal direction of the gutter, the outer profile of the gutter to fitted end walls ( 18 a) and these end walls ( 18 ) connecting to each other, to the boundary walls ( 14 a) the gutter substantially parallel, lateral connec tion walls ( 18 b, 18 c), so that the Abflußge housing ( 18 ) with the outer profile of the gutter ( 14 ) forms a substantially closed drain chamber ( 22 ). 14. Roof drainage system according to claim 13, characterized in that between the end walls ( 18 a) of the drainage housing ( 18 ) also run upper edge flanges ( 18 d) which abut the outer profile of the gutter ( 14 ). 15. Roof drainage system according to one of claims 10 to 14, characterized in that the gutter ( 14 ) in the region of the coverage of its outer profile through the drain housing ( 18 ) has a drainage opening ( 14 g). 16. Roof drainage system according to one of claims 10 to 15, characterized in that the drain housing ( 18 ) has a substantially Lich V-shaped profile in an orthogonal to the gutter longitudinal section. 17. Roof drainage system according to any one of claims 13 to 16, characterized in that (18 b) of the outlet housing (18) connects a drain pipe (24) to at least one of the connecting walls. 18. Roof drainage system according to claim 17, characterized in that the drain pipe ( 24 ) is designed for connection to a down pipe ( 20 ). 19. Roof drainage system according to claim 18, characterized in that the drain pipe ( 24 , 26 ) is triangular in cross section and connects to a corresponding triangular opening ( 18 h) of the respective connecting wall ( 18 b). 20. Roof drainage system according to claim 19, characterized in that the triangular opening (18 h) of the connecting wall is formed (18 b) such that a triangular tip (18 i) in the sole region is located and (18 k) of the outlet housing (18) one of these Triangle tip opposite triangle side ( 18 l) essentially parallel to the gutter length extension at a distance from the sole area. 21. Roof drainage system according to any one of claims 17 to 20, that the drain pipe (24, 26) is designed as a pipe bend (24, 26) from a side wall (18 b) of the ex flußgehäuses (18) first with a horizontal Rich direction component is transverse to the longitudinal direction of the gutter ( 14 ) and is then deflected into the vertical. 22. Roof drainage system, in particular according to one of claims 1 to 21, characterized in that the down pipe ( 20 ) of non-overlapping case pipe sections ( 20 a, 20 b, 20 c), in particular with a triangular cross section, is formed, the facing each other Ends ( 20 ba, 20 cb) are spaced from each other, and that for the connection of these mutually facing ends ( 20 ba, 20 cb) are provided telescopic connectors ( 28 ), each with a larger diameter end section ( 28 b), the one ( 20 ba) of the mutually facing ends ( 20 ba, 20 cb) of the downpipe sections reach around and engage with a smaller-diameter end section ( 28 a) in the other end ( 20 cb) or vice versa. 23. Roof irrigation system according to claim 22, characterized in that the telescopic connector ( 28 ) with a BEFE stigungselement ( 30 , 32 ) for attachment to a building part ( 10 ) is formed. 24. Roof drainage system according to claim 23, characterized in that the cross-sectionally larger end section ( 28 b) is directed upwards and the smaller-diameter end section ( 28 a) is directed downwards and that a downpipe section ( 20 a) arranged between two telescopic connecting pieces ( 28 ) 20 b, 20 c) with its lower end ( 20 ba) on a transitional shoulder ( 28 c) between the different end sections ( 28 b, 28 a) of the associated telescopic connector ( 28 ), whereby to dismantle this downpipe shot (20 b) of this between two successive telescopic connecting members (28) is so far can be raised, that its lower downpipe end (d 28) (20 ab) above the upper end of the associated Teleskopverbin extension piece (28) comes to rest and the fall pipe section (20 b) then after swiveling its lower end ( 20 ba) laterally from the lower end section of the associated upper telescopic connection Gsstücks ( 28 ) is removable. 25. roof drainage system according to claim 24, characterized in that the telescopic connector ( 28 ) and / and an associated fastening means ( 32 ) for attachment to the construction part ( 10 ) with a clamping sleeve ( 36 ) which is connected to the telescopic connector ( 28 ) on adjacent downpipe sections ( 20 b, 20 c) in each case above or below the upper or lower end of the telescopic connection piece ( 28 ) and by a tension lock ( 38 b) against the adjacent down pipe sections ( 20 b, 20 c) is exciting. 26. Roof drainage system according to one of claims 1 to 25, characterized in that the gutter ( 14 ) or / and the connection unit ( 18 ) or / and the downpipe ( 20 ) or / and the support units ( 16 ) at least partially made of stainless steel sheet are manufactured.