EP0940520B1 - Drain for flat roof and flat roof with drain - Google Patents

Abstract

The drain box (16) which is adjoined by a drain pipe (11) leading to a down pipe (12) has a non-sunken base section (17) and a sunken base section (19). The drain pipe (11) has fitting onto the sunken base section a downwardly aligned part (14) and an only slightly inclined pipe end (11') so that the diameter of the pipe end lies completely underneath the base section (17) which is not sunken. The diameter of the pipe end (11') pref. lies at least more than halfway below the sunken base section. The drain box is closed from the roof surface by a screen unit.

Description

The invention relates to a flat roof water drain with a Drain box and an adjoining drain pipe, the for essentially horizontal implementation through a roof edge is intended for a downpipe, the drain box has a floor whose width is greater than the clear one The diameter of the drain pipe is and the bottom of the drain box a non-lowered floor section and one over a step has lowered bottom portion. The invention further relates to a flat roof with such a flat roof water drain.

The invention further relates to a flat roof water drain a drain box and a drain pipe connected to it, that for essentially horizontal implementation an edge upturn to a downpipe is determined, the Drain box has a bottom whose width is larger than that clear diameter of the drain pipe. The invention relates also a flat roof with such a flat roof water drain.

It is basically possible to have flat roofs through an inside of the flat roof pipe system to drain over large areas of a flat roof provide as even a drainage as possible to enable. The considerable effort involved in the roof structure can be avoided if it is sufficient is the flat roof, for example due to its limited Size, just drain at the edge by the usual Roof edge termination (ATTIKA) of the flat roof penetrations with Drain pipes are provided, which are regularly in vertical Open downpipes.

The DIN standard 19599 writes for processes for rainwater maximum damming levels before discharge and minimum discharge quantities for predetermined nominal or nominal widths of the drain pipe. For drain pipes with a nominal width of 100 mm, for example, is a minimum discharge quantity of 4.5 l / s and a maximum accumulation height of 35 mm specified.

It has been shown that through usual ATTIKA processes, as is for example in the book Dierks / Schneider / Wormuth "Baukonstruction", 3rd ed., Düsseldorf 1993, page 575 are values that are not reached by the standard. The well-known flat roof water drains consist of one box formed by a sieve wall, with its bottom on put the flat roof on or in the top sealing layer of the Flat roof is embedded. A rectangular mouthpiece, the bottom of which is flush with the bottom of the sieve box, closes turns on and goes into a round one that is led through by the edging Drain pipe over. The drain pipe is only there installed slightly inclined to the horizontal (1 to 3 °).

GB-A-2 287 042 is a flat roof water drain at the entrance known type known. An essentially L-shaped drain piece draws a trough-shaped lowered section of the floor before, which merges almost continuously into a pipe connection which a horizontally installed drain pipe can be pushed on. The lowered trough of the floor ensures that the water runs off into the horizontal drain pipe. GB-A-2 065 743 and DE-U-1 748 988 also disclose processes with tubes falling downwards.

For the removal of larger amounts of water at the previously known Construction enlarged nominal diameters of the drain pipe be provided.

The fulfillment of the limit values specified by the named standard for the minimum flow rates and maximum accumulation levels for a predetermined nominal diameter of the diameter of the drain pipe does not succeed with the known constructions.

The present invention is therefore based on the problem off, a flat roof drainage through a penetration of a To allow roof edge closure with which the flow rates can be increased and the maximum accumulation levels can be reduced.

On the basis of this problem, according to the invention Flat roof water drainage of the type mentioned in the introduction, that the drain pipe with a falling down Piece and possibly only a slightly inclined pipe end piece connects to the lowered floor section so that the diameter of the pipe end completely below the not lowered floor section.

The invention is based on the knowledge that the previous Considering the drainage problem as a drainage problem with a free surface from a purely hydrostatic point of view, according to which the flow rate and the flow rate by the nominal size of the drain pipe and the dam height before Depending on the mouth of the drain pipe, not only that of the invention can solve the underlying problem. According to the invention measures influencing the hydrodynamics, namely using at least two accelerations of water flow at least one by step-like lowering. there has shown that at least two accelerations are required are to the desired effect of a significant increase to achieve the drainage rate at low water retention levels. The step-like lowering therefore has the effect that a damming reaction of the flowing water on the front dammed water standing at the outlet avoided or at least is significantly reduced, so that a largely backflow free Drainage of water from the flat roof is achieved. The high of step-like lowering of the water flow, that of the acceleration serve the water is already due to the installation conditions limited, the only relatively small step-like subsidence allow (maximum a few centimeters). In addition, the acceleration effect according to the invention towards the drain pipe also only when received a continuous flow remains, so the water flow does not at the step-like subsidence tears off like a waterfall. Are preferred therefore the step-like depressions dimensioned so that after Formation of a constant accumulation height of the water on the Flat roof a steadily flowing water surface in the area of gradual reductions are retained.

In the flat roof water drain according to the invention, the drain pipe arranged so that it is due to low water levels on the flat roof is already completely filled, as it is with its cross section does not cover the surface of the flat roof protrudes. It is thus offset in level compared to the Flat roof surface arranged. In this case, the causes the measures according to the invention accelerated water flow in the drain pipe an additional suction effect, the acceleration effect transfers to the water to be drained on the flat roof and thus contributes to an increase in drainage performance. The second acceleration of the flowing water becomes special executed effectively when the free diameter of the pipe end piece at least more than half below the lowered one Bottom section is located.

It has been shown that it is for the implementation of the invention The method is particularly advantageous if the first step-like acceleration of the water across a flow range takes place, which is much larger than the flow width in the drain pipe. This also makes the filling the drain pipe is already supported at low accumulation heights.

Under a step or step-like lowering is in the sense of present invention a slope increase realized on a small distance to understand. This can be done with an angle of 90 °, but also carried out with a relatively small acute angle be, as can be seen from the exemplary embodiments explained in more detail below results.

The piece falling down according to the invention can be part of a be a piece of pipe sloping downwards, which may be together with a possibly only slightly inclined pipe section the drain pipe forms. The sloping piece can be one have a larger diameter than a remnant of the drain pipe, whose diameter determines the nominal width of the drain pipe.

The piece sloping downwards can join with a mouth connect the lowered floor section. The mouth can are only in the lowered section of the floor, in some cases, however, the lowered ones are also advantageous Bottom section and in a rear end wall of the drain box extend so the drain pipe is not too strong lower compared to the surface of the flat roof.

The stage for forming the lowered floor section and the The beginning of the piece falling down can flow be spaced apart. For a minor Longitudinal expansion, especially for assembly of the whole Flat roof water drain inside the roof edge is useful is the beginning of the bottom section lowered by the step with the beginning of the sloping piece coincide.

For manufacturing and assembly reasons, it is useful if the Drain box with the piece falling down a uniform is prefabricated component. The drain box can Roof surface be closed with a sieve arrangement, the can also be formed as a separate part.

The flat roof water drain according to the invention can be divided into several install advantageous arrangements.

According to the invention is therefore a flat roof with one over Roof insulation layer applied sealing layer and with a Flat roof water drain of the type mentioned above in a first principle embodiment characterized in that the lowered bottom section in one is only over part the thickness of the roof insulation layer extending recess the roof insulation layer is used.

The flat roof water drainage according to the invention therefore requires not that interfering with the load-bearing roof layer become. Rather, it is sufficient if only within the roof insulation layer penetration is provided. It can the mouthpiece of the flat roof water drain that slopes downwards below the lowered section of the floor and inside the roof insulation layer or that falling down Piece connected to the lowered floor section be that it is performed essentially within the edging is.

In an alternative embodiment, the flat roof is included the flat roof water drain according to the invention provided that the sunken bottom section of the flat roof water drain essentially completely arranged within the roof edge is.

Figur 1 -

einen Schnitt durch einen Flachdachaufbau mit einem Flachdach-Wasserablauf gemäß einem ersten Ausführungsbeispiel

Figur 2 -

einen Schnitt durch den isoliert dargestellten Flachdach-Wasserablauf gemäß Figur 1

Figur 3 -

eine Draufsicht auf den Flachdach-Wasserablauf gemäß Figur 2

Figur 4 -

eine Stirnansicht des Flachdach-Wasserablaufs gemäß Figur 2

Figur 5 -

einen Schnitt analog Figur 1 zur Darstellung der kompletten Einbausituation

Figur 6 -

einen Schnitt analog Figur 1 für ein zweites Ausführungsbeispiel eines erfindungsgemäßen Flachdach-Wasserablaufs

Figur 7 -

einen Schnitt durch den Flachdach-Wasserablauf gemäß Figur 6 in Alleinstellung

Figur 8 -

eine Draufsicht auf den Flachdach-Wasserablauf gemäß Figur 7

Figur 9 -

eine stirnseitige Ansicht des Flachdach-Wasserablaufs gemäß Figur 7

Figur 10 -

einen Schnitt analog Figur 5 zur Darstellung der Einbausituation für das zweite Ausführungsbeispiel eines Flachdach-Wasserablaufs gemäß Figur 6

Figur 11 -

einen Schnitt zur Verdeutlichung der Einbausituation für einen Flachdach-Wasserablauf gemäß einem dritten Ausführungsbeispiel

Figur 12 -

einen Schnitt durch den Flachdach-Wasserablauf gemäß Figur 11 in Alleinstellung

Figur 13 -

eine Draufsicht auf den Flachdach-Wasserablauf gemäß Figur 12

Figur 14 -

eine Stirnansicht des Flachdach-Wasserablaufs gemäß Figur 12

Figur 15 -

einen Schnitt analog Figur 1 mit einem Flachdach-Wasserablauf gemäß einem vierten Ausführungsbeispiel der Erfindung

Figur 16 -

einen Schnitt durch den Flachdach-Wasserablauf gemäß Figur 15 in Alleinstellung

Figur 17 -

eine Halbdarstellung einer Draufsicht auf den Flachdach-Wasserablauf gemäß Figur 16

Figur 18 -

eine Halbdarstellung einer stirnseitigen Ansicht des Flachdach-Wasserablaufs gemäß Figur 16.

The invention will be explained in more detail below with reference to exemplary embodiments shown in the drawing. Show it:

Figure 1 -

a section through a flat roof structure with a flat roof water drain according to a first embodiment

Figure 2 -

a section through the flat roof water drain shown in isolation according to Figure 1

Figure 3 -

a plan view of the flat roof water drain according to Figure 2

Figure 4 -

3 shows an end view of the flat roof water drain according to FIG. 2

Figure 5 -

a section analogous to Figure 1 to show the complete installation situation

Figure 6 -

a section analogous to Figure 1 for a second embodiment of a flat roof water drain according to the invention

Figure 7 -

a section through the flat roof water drain according to Figure 6 in isolation

Figure 8 -

a plan view of the flat roof water drain according to Figure 7

Figure 9 -

an end view of the flat roof water drain according to Figure 7

Figure 10 -

5 shows a section analogous to FIG. 5 to illustrate the installation situation for the second exemplary embodiment of a flat roof water drain according to FIG. 6

Figure 11 -

a section to illustrate the installation situation for a flat roof water drain according to a third embodiment

Figure 12 -

a section through the flat roof water drain according to Figure 11 in isolation

Figure 13 -

a plan view of the flat roof water drain according to Figure 12

Figure 14 -

an end view of the flat roof water drain according to Figure 12

Figure 15 -

a section analogous to Figure 1 with a flat roof water drain according to a fourth embodiment of the invention

Figure 16 -

a section through the flat roof water drain according to Figure 15 in isolation

Figure 17 -

a half representation of a plan view of the flat roof water drain according to Figure 16

Figure 18 -

16 shows a half representation of an end view of the flat roof water drain according to FIG. 16.

The sectional view shown in Figure 1 shows a load-bearing Ceiling structure 1, for example in the form of a concrete ceiling. To the ceiling structure is covered by a barrier film 2, a Insulating insulating layer 3 of greater thickness and a sealing layer 4 completed, generally by several bitumen roofing membranes etc. is formed.

The edge of the roof structure 1 is closed by a roof edge 5 formed, which encloses the flat roof structure 1 trough-shaped and a supporting core 6, for example also from a concrete layer, having. Connects to the inside of the roof the core 6 to the seamlessly installed barrier film 2, which also covers the top of the core 6 and on the outside of the Roof edge finish 5 ends. Closes on the inside of the roof to the barrier film 2 to an insulating layer 7, which extends to top end of the core 6 extends. A corresponding insulation layer 7 is located on the outside of the core 6 and of the roof structure 1. To the outside is the insulating layer 7 through a facade layer 8, for example in the form of a plaster layer, completed. The edge upstand 5 is at the top by means of a crown material 9 spanning the entire width completed. The sealing layer 4 is on the vertical inside the roof edge termination 5 continued and extends over the top of the wreath material 9 to the outside of the roof edge termination 5, so that there is an overlap with the Facade layer 8 results. On the top of the roof edge 5 is a roof covering 5 completely overlapping Final profile 10 applied to the vertical Sides spaced from the sealing layer 4 ends.

An essentially horizontal drain pipe 11 opens out on the outside of the roof edge finish 5 in a vertical Downpipe 12, which is regularly a on its top Has ventilation opening. The drain pipe 11 is through a pipe end piece 12 is formed, which via a conventional pipe socket connection 13 in an angled, falling down Piece 14 merges with an opening 15 connects to a substantially rectangular drain box 16. The drain box 16 is shown in FIG Embodiment with a lying on the insulating layer 3 Connection base piece 17 provided, which is at right angles trained step 18 in a lowered bottom portion 19 passes. To accommodate the lowered floor section 19 and level 18 is the insulating layer 3 with a corresponding recess 20 provided in the illustrated Embodiment less than half of the The thickness of the insulating layer 3 extends. The drain box 16 is through a rear end wall 21 and an upper cover wall 22 completed. The drain box 16 extends in depth of the roof edge termination 5, so that the roof edge termination 5 with a corresponding recess 23 in the region of the insulating layer 3 and the core 6 is provided. The cover wall 22 closes with the roof edge finish 5.

The mouth opening 15 thus extends over approximately half of the lowered bottom section 19 and half the height of the rear End wall 21. The piece 14 is at an acute angle of about 30 ° down and angled so that it is only slightly (between 1 and 5 °) inclined drain pipe 12 continues. The insertion movement of the drain box 16 into the recess 23 the roof edge finish 5 is through a vertical wall piece 24 limited. The L-shaped inlet opening of the drain box 16 is through a correspondingly angled screen grid 25 covered, which retains coarse impurities.

Figure 2 shows that the drain box 16 in one piece with the falling piece 14 is formed and in this form can be assembled as a standard component. The approach of the drain pipe 12 on the piece 14 allows adaptation to different thicknesses the edge upstand 5 and the respective local conditions.

Figure 3 shows that the stage 18 not only in the flow direction but is also formed laterally and a width of lowered bottom section 19 defines that much wider than the diameter of the tubular piece 14 or the mouth opening 15 is. The corresponding context also leaves recognize the frontal top view according to Figure 4.

Figure 5 shows that the roof structure described regularly by a gravel fill 25 is covered and that keeping the Inlet opening of the drain box 16 through a mesh cage 26 can take place, which is designed as a separate part.

For the description of the following exemplary embodiments the same reference numbers are used for functionally identical parts, although the statements may be modified in individual cases.

In the embodiment shown in Figures 6 to 10 the drain box 16 is completely in the recess 20 the insulating layer 3 housed. Accordingly, that closes Piece 14 sloping downwards and goes into the with End pipe section 12 of the drain pipe 11 overlapping leg, which is passed through the roof edge termination 5. The pipe end piece 12 of this embodiment is thus opposite the pipe end piece 12 extended in the embodiment of Figure 1. The leg of piece 14 running diagonally downward is exclusive performed in the insulating layers 3, 7.

Figures 7 to 9 illustrate that the rest of the arrangement stage 18 and the second acceleration causing downward mouth opening 15 is completely the same as in the first embodiment shown in Figures 1 to 5.

Figure 10 illustrates that the opening of the drain box 16 the level of the flat roof is larger and therefore a larger one Mesh box 26 needed.

A third exemplary embodiment is shown in FIGS. 11 to 14 shown. The drain box 16 is completely in the roof edge termination 5, so that the insulating layer 3 of the Flat roofs remain practically untouched. Although thus from the Surface of the flat roof only a lateral drain is available stands, is by the inventive design of a stage 18th and a second acceleration due to the falling Piece 14 the DIN-compliant minimum flow rate by a given Nominal diameter of the drain pipe 11 reached.

The mouth opening 15 of the piece 14 is in this embodiment completely in the range of that lowered by level 18 Bottom section 19. Incidentally, the one that slopes downwards Piece 14 in turn angled to the connection to produce the drain pipe 11.

Also in the fourth exemplary embodiment shown in FIGS. 15 to 18 the drain box 16 is only in the area of the roof edge finish 5. However, it is essential shorter, so that the mouth opening 15 both in the lowered bottom section 19 as well as in the rear End wall 21 extends into it. To reduce the length the drain box 16 is the front edge of the mouth opening 15 under level 18, which is at the butt joint between the roof edge 5 and the insulating layer 3 of the roof structure 1 is. Since the width of the stage 18 is much larger than the width of the mouth opening 15 finds the invention Accelerating the outflowing water twice in relevant Way instead.

Because of the training according to the invention, it is shown with all Embodiments possible, which were not previously achievable Standard values for the water flow rates and the maximum Heights of accumulation on the roof structure 1.

Claims (14)

1. Flat roof drain with a run-off box (16) and an adjoining outlet pipe (11) which is intended to be routed substantially horizontally through a roof surround (5) or through a built-up edging to a downpipe (12), the run-off box (16) having a base (17, 19) whose width is greater than the inside diameter of the outlet pipe (11) and the base (17, 19) of the run-off box (16) having an unlowered base portion (17) and a base portion (19) which is lowered via a step (18), characterized in that the outlet pipe (11) adjoins the lowered base portion (19) by way of a downwardly sloping section (14) and an at most only slightly inclined pipe endpiece (11'), in such a way that the diameter of the pipe endpiece (11') lies completely below the unlowered base portion (17).
2. Flat roof drain according to Claim 1, characterized in that the diameter of the pipe endpiece (11') furthermore lies at least by more than half below the lowered base portion (19).
3. Flat roof drain according to Claim 1 or 2, characterized in that the downwardly sloping section (14) has a larger diameter than the pipe endpiece (11') of the outlet pipe (11).
4. Flat roof drain according to one of Claims 1 to 3, characterized in that a mouth opening (15) of the downwardly sloping section (14) is'situated exclusively in the lowered base portion (19).
5. Flat roof drain according to one of Claims 1 to 4, characterized in that a mouth opening (15) of the downwardly sloping section (14) extends into the lowered base portion (19) and a rear end wall (21) of the run-off box (16).
6. Flat roof drain according to one of Claims 1 to 5, characterized in that the step (18) and the start of the section (14) are arranged at a distance from one another in the direction of flow.
7. Flat roof drain according to one of Claims 1 to 6, characterized in that the start of the base portion (19) lowered by means of the step (18) coincides with the start of the section (14).
8. Flat roof drain according to one of Claims 1 to 7, characterized in that the run-off box (16), together with the section (14), is a uniform prefabricated component.
9. Flat roof drain according to one of Claims 1 to 8, characterized in that the run-off box (16) is closed towards the roof surface by means of a screen arrangement (25, 26).
10. Flat roof drain according to Claim 9, characterized in that the screen arrangement (25, 26) is formed by a separate part.
11. Flat roof with a sealing layer (4) applied over an insulating layer (3) and with a flat roof drain according to one of Claims 1 to 10, characterized in that the lowered base portion (19) is fitted in a clearance (20) in the roof-insulating layer (3) that extends only over part of the thickness of said insulating layer (3).
12. Flat roof according to Claim 11, characterized in that the downwardly sloping section (14) is routed below the lowered base portion (19) and within the roof-insulating layer (3).
13. Flat roof according to Claim 11 or 12, characterized in that the downwardly sloping section (14) is connected to the lowered base portion (19) in such a way that it is routed substantially within the roof surround (5).
14. Flat roof with a flat roof drain according to one of Patent Claims 1 to 10, characterized in that the lowered base portion (19) is arranged substantially completely within the roof surround (5).

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