EP2098657A2 - Roof drainage device - Google Patents

Abstract

The device (10) has a main-inlet device (14) for main discharge of water into a main-discharge pipe. An emergency-inlet device (16) is provided for discharging water, which is accumulated on an orifice of the main-discharge pipe in a preset emergency discharge height, into an emergency-discharge pipe by pressure flow. The emergency-discharge pipe extends over a part of length inside cross-section of the main-discharge-pipe and includes a free cross-section smaller than that of the main-discharge pipe. The main-inlet device includes a lip with cross-section much large as the orifice.

Description

The invention relates to a roof drainage device for draining water from a roof, comprising (a) a main inlet for a main drain into a main drain pipe having a mouth and (b) an inlet for draining water above a predetermined emergency drain above the mouth by means of pressure flow in an emergency drain pipe whose free cross-section is smaller than that of the main drain pipe and which extends at least over part of its length within the cross section of the main drain pipe.

Such a roof drainage device is known from DE 10 2005 012 439 and the DE 10 2005 012 438 known. A disadvantage of such roof drainage devices is that the main drain pipe must be easily soiled and often cleaned, if the full drainage performance is to be maintained.

From the DE 102 01 347 A1 For example, there is known an inlet device for the discharge of rainwater from a roof, in which the main drainage pipe is covered by a brim in order to achieve a pressure flow. The emergency procedure, however, is designed as a free-drain procedure. A disadvantage of this embodiment is that it must provide a considerable inner diameter for the emergency drain pipe in order to be able to discharge the water masses safely in an emergency. Another disadvantage is that the emergency drain and the free-flowing drain can easily become dirty and then clog in an emergency.

The invention has for its object to provide a roof drainage device, which has a lower risk of clogging.

The invention solves the problem by a generic roof drainage device according to claim 1.

An advantage of this roof drainage device is that the water when it is approximately at the height of the emergency drainage height on the roof, forms a pressure flow in the main drain pipe. This creates a high flow velocity, which entrains any dirt. If the main drainpipe becomes dirty, the water also rises higher on the roof on average, which increases the likelihood that a pressure flow will develop. In other words, there is a negative feedback in which occurs when contamination of the main drain pipe rather a cleaning. This gives a substantially maintenance-free roof drainage device.

It is also advantageous that the water drains quietly even when the water level has approximately the height of the emergency drainage height, because there is no noisy tearing of the water flow due to the brim.

It is a further advantage that forms a pressure flow at high water levels in the main drain pipe, so that when there is a lot of water on the roof, the drainage capacity of the roof drainage device is particularly high. It is also advantageous that the roof drainage device according to the invention is simple and thus can be produced inexpensively.

By the brim it is achieved that at a water level which corresponds approximately to the Notablaufhöhe, also forms a pressure flow in the main drain pipe, which significantly increases the discharge capacity of the main drain pipe. As a result, the total dissipation of the roof drainage device increases. The brim is thus arranged so that, when water is present above the Notablaufhöhe, forms a pressure flow in the main drain pipe. This means that a water column substantially free of large air bubbles forms in the main drain pipe, so that a negative pressure is applied below the brim.

By the feature that the cross section of the brim is at least as large as the mouth opening, it is to be understood in particular that the brim completely covers the mouth opening. If, for example, the brim and the mouth opening are both bounded in a circular manner and arranged concentrically one above the other, the rim diameter is at least as large as the mouth diameter.

In a preferred embodiment, the main inlet device has a main inlet surface, which passes through an inlet opening boundary in the mouth opening of the main drain pipe, wherein the brim in vertical projection completely spans the inlet opening boundary. The advantage of this is that the pressure flow, if the water level corresponds approximately to the emergency drainage, can form particularly well. As a result, the roof drainage device achieves a particularly high dissipation effect in the case of such water levels,

Under the inlet opening boundary is understood in particular the transition from the horizontally extending main inlet surface to the inclined to the horizontal main drain pipe. In other words, the vertical projection of the brim encloses the mouth opening, more specifically the mouth opening boundary.

In a preferred embodiment, it is provided that the main drain pipe merges upward from a cylinder jacket-shaped pipe section into a truncated cone-like widened pipe section whose upper end forms the mouth opening.

Preferably, a main drain pipe cross-sectional area of the main drain pipe is larger than an emergency drain cross-sectional area of the emergency drain pipe. For example, the main drain pipe cross-sectional area is at least twice as large as the emergency drain pipe cross-sectional area. As a result, a particularly compact roof drainage device is obtained, which nonetheless reliably dissipates water which is still present above the emergency drainage height, since a pressure flow can form in the emergency drainage pipe.

Preferably, the brim forms an emergency inlet surface of the emergency inlet device, which terminates flush with the emergency drainage pipe. In this case, the brim has two functions that complement each other.

According to a preferred embodiment, the emergency inlet device comprises an airtight lid which forms a downwardly open and otherwise airtight cavity and is disposed above the rim, the lid having a lid diameter smaller than a brim diameter of the rim. Particularly preferably, the diameter of the mouth opening is smaller than the lid diameter and this in turn smaller than the rim diameter. It thus results in a particularly compact roof drainage device, which has a particularly low noise level at all possible water heights.

It is preferable that the brim in the installation position of the roof drainage device is substantially horizontal. By this is meant that the brim does not have to be horizontal in the strict mathematical sense, but small deviations of, for example, less than 5 ° are tolerable. The brim can have the shape of a flat disc. In this way, noises are suppressed particularly effectively. The brim can also be convex and thus form a downwardly open, airtight cavity.

Preferably, the brim is substantially circularly bounded and has a diameter which is at least twice the diameter of the main drainage pipe. As a result, a formation of a pressure flow is effectively promoted.

A particularly easy to produce roof drainage device results when the emergency drain pipe is cylindrical. A further advantage is that a cylindrical emergency drainage pipe builds up a pressure flow particularly effectively, so that dewatering of the roof is always possible in an efficient manner.

According to a preferred embodiment, the roof drainage device has at least one outer guide element for reducing or suppressing a radial flow in water entering the main inlet device and / or the emergency inlet device. In this case, two, three or a plurality of guide elements can be provided, which are preferably arranged in the same angular increments. Thus, vortices are avoided, especially in the water entering the main inlet device, and a pressure flow in the main outlet tube forms particularly quickly. The guide elements may be baffles, for example.

Preferably, the brim has a radially outer, in the installed position substantially horizontally extending outer portion and a radially inwardly on the outer portion attached, the outer portion angled extending inner portion. Thus, a pressure flow in the main drain pipe is formed very quickly.

This brim is particularly easy to manufacture, if the inner section has a widening section which essentially adjoins the emergency drain pipe and which extends substantially horizontally in the installed position, and a vertical section which adjoins the widening section and which extends substantially vertically in the installed position.

According to a preferred embodiment, the emergency inlet device comprises an airtight lid, which is arranged below the brim and has a lid diameter which is greater than the rim diameter of the brim. In this way, a particularly flat-roof roof drainage device can be obtained, which nevertheless safely carries the excess water into the emergency drain when exceeding the emergency drainage height.

Particularly preferably, the roof drainage device comprises a dirt retaining device, which is designed so that both such coarse dirt contained in the water, which runs in the main drain pipe, as well as such coarse dirt is contained, which is contained in water, which in the emergency drain pipe is running. In other words, the dirt retention device is designed to retain coarse dirt from all water, which enters one of the two processes. It may be, for example, a grid or a rake. The advantage of this is that when a pressure flow forms in the main drain pipe, the dirt retention device is cleaned. Separate cleaning of the dirt retention device is therefore largely unnecessary. Coarse dirt is understood as meaning, for example, leaves and other leaf parts.

Preferably, the roof drainage device in the lid elongated slots whose height is smaller than the width thereof. In other words, there are the slits. This has the advantage that on the one hand, only a small resistance is opposed to the inflowing water, on the other hand, a pressure flow is formed particularly quickly. If the water rises to a level above an upper edge of the slits, only water flows into the area under the lid. Any remaining air is entrained by the water flow and a negative pressure forms under the lid, which increases the flow of water into the lid ,

Figur 1

einen Querschnitt durch eine erfindungsgemäße Dachentwässerungsvorrichtung,

Figur 2

einen Kopfabschnitt der Dachentwässerungsvorrichtung nach Figur 1,

Figur 3

einen Querschnitt durch eine bevorzugte erfindungsgemäße Dachentwässerungsvorrichtung auf einem erfindungsgemäßen Dach,

Figur 4

einen Kopfabschnitt der Dachentwässerungsvorrichtung nach Figur 3,

Figur 5

ein Detail der Dachentwässerungsvorrichtung nach den Figuren 3 und 4,

Figur 6

einen Querschnitt durch das Detail nach Figur 5 und

Figur 7

einen Querschnitt durch eine weitere erfindungsgemäße Dachentwässerungsvorrichtung.

In the following, exemplary embodiments of the invention are explained in more detail with reference to the accompanying drawings. It shows

FIG. 1

a cross section through a roof drainage device according to the invention,

FIG. 2

a head portion of the roof drainage device according to FIG. 1 .

FIG. 3

a cross section through a preferred roof drainage device according to the invention on a roof according to the invention,

FIG. 4

a head portion of the roof drainage device according to FIG. 3 .

FIG. 5

a detail of the roof drainage device according to Figures 3 and 4 .

FIG. 6

a cross section through the detail after FIG. 5 and

FIG. 7

a cross section through another roof drainage device according to the invention.

FIG. 1 FIG. 10 shows a roof drainage apparatus 10 for discharging water from a roof 12 having a main inlet 14 and an emergency inlet 16.

The main inlet device 14 comprises a main drain pipe 18, which has a cylinder jacket-shaped pipe section 20. The cylinder-jacket-shaped pipe section 20 merges in an orifice section 22 into an orifice 24, which has a mouth opening diameter D _M ( FIG. 2 ). The mouth portion 22 merges in a circular mouth opening boundary into a horizontally extending main inlet surface 30.

The emergency inlet device 16 is designed to divert water over an emergency drainage height H _N and comprises an emergency drainage pipe 26 which has a diameter D _N. The emergency drain pipe diameter D _N is smaller than a main drain pipe diameter D _F (see. FIG. 2 ). The emergency drain pipe cross-sectional area is calculated to A _N = πD _N and the main drain pipe cross-sectional area to A _P = πD _P - πD _N , where A _{F is} more than twice AN, approximately three times in the present case.

The main inlet device 14 comprises a horizontally extending rim 28 having a rim diameter D _K which is larger than the mouth opening diameter D _M. The brim 28 is disposed to the main run-in surface 30 such that when the main run-in surface 30 is located at the level of a roof seal 32, the brim 38 lies exactly at the emergency drain height H _N. The brim 28 runs flat and at a right angle to the emergency discharge pipe 26 and thus forms an emergency inlet surface of the emergency inlet device 16. The brim 28 causes a pressure flow to form in the main inlet device 14 when water above a pressure flow level H _D is pending. The brim 28 is designed, for example, such that the pressure flow height H _{D is} below the emergency drain height H _N.

FIG. 2 shows that the emergency inlet device 16 also comprises a lid 34 which has a substantially cylindrical shape, a lid diameter D _D and is concentric with the main drain pipe 18 and the emergency drain pipe 26 is arranged. The lid 34 has a lid rim 36 which extends horizontally and terminates at a height H _D which is greater than the emergency drain height H _N. Water, which is higher than the emergency drainage height H _N , but below the lid rim height H _D , runs in the main sequence on the emergency inlet surface in the emergency drain pipe 26. By the brim 28, the pressure flow in the main drain pipe 18 is stabilized.

Water, which is present above the lid rim height H _D , is sucked in by a lideldom 38 of the airtight lid 34 pending negative pressure, so that forms a pressure flow in the emergency drain pipe 26. The negative pressure in the lidoma 38 arises from the fact that 38 existing air is entrained in the lid cathedral from the effluent through the emergency drain pipe 26 water. This corresponds to the principle of the water jet pump.

If the water is present only just below the lid rim height H _D , then no stable negative pressure can build up in the lid drum 38. It comes to pressure fluctuations. The fact that the cover diameter D _{D is} smaller than the rim diameter D _K or as large as this, prevents these pressure fluctuations have a negative impact on the pressure flow in the main drain pipe 18. Noise is effectively reduced.

If water is present above the emergency drainage height H _N , water which is present in the main drainage pipe 18 is also torn down so that a pressure flow is established there by the brim 28. The formation of the pressure flow is supported by the brim 28.

In the vertical direction between the main inlet surface 30 and the emergency drainage height H _N equidistant dirt retaining discs 40a, 40b and 40c are arranged, the outer diameter of which correspond to the rim diameter D _K , but which have an inner diameter D _i , which is greater than the mouth opening diameter D _N. The dirt retaining discs 40 prevent leaves from entering the main drainpipe 18.

The roof drainage device 10 is fastened to the roof 12 by fastening means 42a, 42b, 42c. The lid 34 is attached via three webs 44, of which in FIG. 2 only one footbridge is visible.

It is favorable if both the main drain pipe 18 and the emergency drain pipe 26 open into a respective branch pipe after a branch point, the two pipes thus produced having the same diameter.

FIG. 3 shows a preferred embodiment of a roof drainage device according to the invention, in which the lid 34 is formed as a flat disc.

FIG. 4 shows a head portion of the preferred embodiment of the roof drainage device according to FIG. 3 , It can be seen that the cover 34 is formed by an example, 2 mm thick disc having a cover diameter D _D and spans all other components of the roof drainage device 10. In contrast to the embodiment according to the FIGS. 1 and 2 the brim 28 has a radially outer, in the installed position substantially horizontally extending outer portion 46 and a radially inwardly on the outer portion 46 attaching to the outer portion angled extending inner portion 48.

The inner section 48, in turn, has a widening section 50 which attaches to the emergency drainage pipe 26 and which essentially runs horizontally in the installed position, and a vertical section 52 which adjoins this widening section 50 and is shown in the final figure 2 substantially vertically. In other words, the brim 28 configured radially trough-shaped inside, the emergency drain pipe 26 attaches to a trough bottom. Assuming that the outer portion 46 is substantially horizontal, it should be understood that it is possible, but not necessary, for the outer portion to be horizontal in the strict sense. Rather, it is possible that the outer portion 46 forms a small angle with the horizontal of, for example, less than 5 °.

The inner portion 48 does not necessarily have to be vertical. By the feature that the inner portion 48 extends at an angle to the outer portion 46, it is to be understood in particular that both have an angle of, for example, more than 30 ° with each other. It is also possible that the brim changes in diameter trumpet funnel shape continuously. At the brim 28 guide elements 54.1, ... are arranged, of which in FIG. 4 only the guide element 54.1 can be seen.

FIG. 5 shows a perspective view of the rim 28 with the guide elements 54.1, ..., 54.6, which are fastened in equidistant angular steps to the rim 28 and extend radially outward. The guide elements 54 have a height that is smaller by a small amount than a distance between an upper side of the outer portion 46 and the main inlet surface 30 (see FIG. FIG. 4 ). The vanes 54 prevent flow of water in a circumferential direction about the emergency drain pipe 26.

FIG. 6 shows a cross section through the brim 28th FIG. 7 shows an embodiment in which the lid diameter D _{D of} the lid 34 corresponds to the rim diameter D _K. In this way, a compact roof drainage device is obtained in which the pressure flow in both the main inlet device 14 and in the emergency inlet device 16 jump quickly.

LIST OF REFERENCE NUMBERS

10

Roof drainage device

12

top, roof

14

Main inlet device

16

Emergency inlet device

18

Main flow pipe

20

cylinder jacket-shaped pipe section

22

mouth portion

24

mouth

26

Emergency drain pipe

28

brim

30

Main lead-in area

32

roof sealing

34

cover

36

cap brim

38

Deckeldom

40

Dirt retaining washers

42

fastener

44

web

46

outer portion

48

inner portion

50

expansion section

52

vertical section

54

vane

D _i

Inner diameter

D _M

Orifice diameter

D _N

Emergency drain pipe diameter

D _F

Main flow pipe diameter

D _D

Cover diameter

D _K

Kremp diameter

H _N

Notablaufhöhe

H _{D '}

Kremp cover height

Claims (15)

Roof drainage device (10) for removing water from a roof (12), with (A) a main inlet device (14) for a main outlet in a mouth opening (24) having main drain pipe (18) and (b) an emergency inlet device (16) for discharging water accumulated above a predetermined emergency drainage height (H _N ) via the outlet opening (24) by means of pressure flow into an emergency drainage pipe (26), (i) whose free cross section is smaller than that of the main drain pipe (18) and (ii) extends at least over part of its length within the cross section of the main drain pipe (18), characterized in that (C) the main inlet device (14) comprises a brim (28) whose cross-section is at least as large as the mouth opening (24). Roof drainage device (10) according to any one of the preceding claims, characterized in that the main inlet device (14) comprises a main inlet surface (30) which merges into the mouth opening (24) of the main drainage pipe (18) through a mouth opening boundary and the Brim (28) in vertical projection completely spans the mouth opening boundary. Roof drainage device (10) according to any one of the preceding claims, characterized in that a main drain pipe cross-sectional area of the main drain pipe (18) is greater than an emergency drain pipe cross-sectional area of the emergency drain pipe (26). Roof drainage device (10) according to one of the preceding claims, characterized in that the brim (28) forms an emergency inlet surface of the emergency inlet device (16) and terminates flush with the emergency drainage pipe (26). Roof drainage device (10) according to one of the preceding claims, characterized in that the emergency inlet device (16) comprises an airtight cover (34) which - Forms a downwardly open and otherwise airtight cavity (38) and is arranged above the brim (28), - The lid has a lid diameter (D _D ), which is at most as large as a Krempendurchmesser (D _K ) of the brim (28). Roof drainage device (10) according to any one of the preceding claims, characterized in that the brim (28) is substantially circularly bounded and has a rim diameter (D _K ) at least twice that of a main drain pipe diameter (D _F ). Roof drainage device (10) according to one of the preceding claims, characterized in that the emergency discharge pipe (26) is cylindrical. Roof drainage device (10) according to one of the preceding claims, characterized by at least one radially outwardly extending guide element (54) for reducing a radial flow in the main inlet device (14) and / or the emergency inlet device (16) incoming water. Roof drainage device (10) according to one of the preceding claims,
characterized in that the brim (28) - A radially outer, in the installed position substantially horizontally extending outer portion (46) and Having an inside radially on the outer portion (46) attaching, the outer portion (46) extending at an angle inner portion (48). Roof drainage device (10) according to claim 9, characterized in that the inner portion (48) - A on the emergency drain pipe (26) attaching, in the installed position substantially horizontally extending expansion portion (50) and - A subsequent to the widening portion (50), in the installed position substantially vertically extending vertical portion (52). Roof drainage device (10) according to one of the preceding claims, characterized in that the emergency inlet device (16) comprises an airtight cover (34) which is arranged above the brim (28), - Has a cover diameter (D _D ), which is greater than the Krems diameter (D _K ) of the brim (28). Roof drainage device according to one of the preceding claims, characterized by a dirt retention device, which is designed such that - both such coarse dirt is retained, which is contained in water, which runs in the main drain pipe (18), - As well as such coarse dirt is retained, which is contained in water that runs in the emergency drain pipe (26). Roof drainage device according to one of the preceding claims 5 to 12, characterized in that in the cover (34) elongated slots are formed whose height is smaller than the width thereof. Roof (12), which is formed - For a main outlet for on the roof (12) below an emergency drain height (H _N ) pent up water and for an emergency drain for water accumulated on the roof (12) above the emergency drainage height (H _N ),
characterized by a roof drainage device (10) according to any one of the preceding claims. Roof (12) according to claim 14, characterized in that the main inlet surface (30) is arranged at the same height to a sealing roof surface (32).

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