DE20003065U1 - Water drainage for sealed surfaces - Google Patents

Abstract

The outlet comprises an outlet unit formed by an outlet pipe (11) and outlet openings which are connected to the pipe. The unit is dimensioned in such a way that the outlet pipe is filled in order to form a suction-generating back pressure to provide a high drainage efficiency. The outlet pipe has openings (13) after a pre-specified height and beneath its upper end. The openings enable air to enter while preventing water from escaping.

Description

Water drainage for sealed surfaces

The invention relates to a water drain for sealed surfaces
with a drainage device having a drainage opening and a drainage pipe connected to the drainage opening, which is dimensioned such that the drainage pipe is filled to form a suction negative pressure for a greater drainage capacity.

It is known to dimension drainage facilities so that
When a certain level of accumulation is formed in the area of the drain opening, the drain pipe is filled to such an extent that the column of water falling in the drain pipe blocks the drain pipe in the
Essentially airtight, thus creating a negative pressure effect that sucks in the water at the drain opening and thus increases the flow rate through the drain pipe.
Such water drains are designed as roof drains with a
vertical drain opening and a horizontal collecting line to a vertical drain pipe or as a parapet drain at the edge of a substantially flat roof surface. In the latter case, the water is drained through a drain opening arranged at the edge of the roof through the roof edge finish (parapet)

Hanover:

Koblenzer Straße 21 D-30173 Hannover Federal Republic of Germany *

Please reply to:

Brunswick:

75 09*

Theodor-Heuss-Straße 1 D-38122 Braunschweig Federal Republic of Germany phone 0531 / 28 14 0-0 / 28 140 28

•*

and led into a vertical drainpipe outside the roof edge.

The increase in drainage capacity is positive in itself, but it also results in considerable noise. This noise has been seen as an unavoidable side effect of vacuum drainage and is an obstacle to the widespread use of vacuum drainage. For example, it is not acceptable for residential buildings to allow the noise that occurs during suction drainage to occur without major additional expenditure, as this would significantly impair the quality of life. The use of suction drainage has therefore been essentially restricted to industrial buildings where the high level of noise can be tolerated.

Extensive investigations by the inventor have shown that the main cause of the noise is cavitation, which occurs in the area of the inlet opening due to the suction effect. These investigations have shown that the noise is proportional to the negative pressure generated. However, the negative pressure generated is determined by the diameter and length of the vertical drain pipe.

Based on this finding of the inventor, the water drain of the type mentioned at the outset is characterized according to the invention in that the drain pipe has openings at a predetermined height below its upper end which allow air to enter the drain pipe but do not allow water to escape from the drain pipe.

Based on the inventor's findings described above, the water outlet is designed according to the invention in such a way that a defined negative pressure is created, which results from air being introduced into the water column after a certain fall height of the water in the outlet pipe, whereby a further negative pressure effect is excluded below the air inlet,

·

·

·

so that the negative pressure effect achieved is determined by the height of the air entering the water column of the drain pipe. In this way, it is possible to set the suction pressure optimally for each water drain, at which no annoying noise is generated and yet an increased drainage capacity is achieved through a defined negative pressure. The design ensures that air can enter at a defined height of the water column, but water cannot escape from the drain pipe.

For this purpose, the drain pipe can be double-walled in the area of the openings with an inner pipe without openings, so that the air enters through a gap between the outer pipe and the inner pipe with a downstream air flow. The outer pipe can have inlet slots that are located above the lower end of the inner pipe in order to enable the downstream air flow in the gap between the inner pipe and the outer pipe.

To ensure a visually appealing appearance of the outer pipe, it may be useful to design the inner pipe as a retracted section of the drain pipe and to essentially continue the outer diameter of the drain pipe with the outer pipe. It is of course also possible to end the drain pipe at a defined height and to form the outer pipe using a widened sleeve of a connecting pipe section.

If the drain pipe is very high, it is advisable to provide several spaced-apart openings for air inlet along the height of the drain pipe.

In a particularly preferred embodiment of the water drain according to the invention, a container closed at the top is placed on the drain opening, the side wall of which is provided with inlet openings distributed over its circumference, the height of which is smaller than the height of the side wall, the container being hermetically formed above the inlet openings. A

Such a container ensures a defined "start" of the suction effect when the water accumulates at a defined height in the area of the drain opening, which is determined by the height of the inlet openings. Such a drain device with a container that causes a defined start of the suction effect is explained in detail in DE U 298 23 303.7.

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

Figure 1 - a vertical section through a drainage system for drainage in the middle area of a roof surface

Figure 2 - a vertical section through a drainage device for draining a roof surface through a roof edge finish

Figure 3 - a vertical section through a first embodiment of a drain pipe designed according to the invention

Figure 4 - a side view of the drain pipe according to Figure 3

Figure 5 - a vertical section through a second embodiment of a drain pipe according to the invention

Figure 6 - a side view of the embodiment according to Figure 5

Figure 7 - a vertical section through a third embodiment of a drain pipe according to the invention

Figure 8 - a horizontal section through the drain pipe according to Figure 7

1

figure 5 figure 9 figure 10 11

a vertical section through a fourth embodiment of a drain pipe according to the invention

a vertical section through a fifth embodiment of a drain pipe according to the invention

a vertical section through the embodiment according to Figure 10, rotated by 90° with respect to the plane of the section in Figure 10

a horizontal section through the embodiment according to Figure 10

a vertical sectional view of a drain pipe with several air inlet points

a sectional view rotated by 90° of the embodiment according to Figure 13

a horizontal section through the embodiment according to Figure 13.

Figure 1 shows a load-bearing roof layer 1 on which a sealing film 2 is laid, which is intended to support an insulating layer 3. A roof sealing layer 4 is laid on the insulating layer 3.

Figure 1 shows a roof edge finish 5 which is constructed in the same way.

The roof drainage is carried out via a drainage opening 6 in the roof sealing layer 4, which is formed by a mouth opening of a drainage pipe 7 angled at 90°. The drainage pipe 7 is laid in an insulating body 8, which takes the place of the insulating layer 3 in the area of the drainage pipe 7. In the embodiment shown, the drainage pipe 7 is made of several parts and is connected by the

10 figure 12 - figure 13 - 15 figure 14 - figure 15 - 20

The drainage pipe 7 passes through the roof edge finish 5 horizontally. The drainage pipe 7 passes over a bend 9 into a vertical inner pipe 10 of a vertical drain pipe 11. In this embodiment, the vertical drain pipe 11 forms an outer pipe 12 surrounding the inner pipe 10, which is provided with slot-shaped openings 13 slightly above the free end of the inner pipe 10, through which air enters the vertical drain pipe. The incoming air is entrained by the flowing water jet that exits the inner pipe 10,

&iacgr;&ogr; so that a downstream air flow is created between the inner tube 10 and the outer tube 12 as far as the end of the inner tube 10. The air entering the water column through the openings 13 at the end of the inner tube 10 interrupts the formation of a closed suction water column below the inner tube 10 with a suction effect as far as the drain opening 6. The negative pressure effect defined by the hydrostatic height of the water column is therefore set by the length of the inner tube 10 and limited by the air entering through the openings 13. In this way, an excessive negative pressure effect, which leads to cavitation in the area of the suction opening 6 and causes considerable noise, can be prevented in a targeted and defined manner.

In this embodiment, above the intake opening 6 there is a container 14 with a round cross-section, which has a cylindrical side wall 15 and a lid 16 placed on top of it in a sealed manner. In the side wall there are inlet openings 17 in the form of slots that are open downwards, up to approximately the height of the side wall 15. All openings 17 have the same height and define a damming height for the water in the area of the drain opening 6, above which a vacuum drainage "starts" because the accumulated water level closes the openings 17 and the air space in the container 14 above the inlet openings 17 is hermetically sealed. Since no air can flow in due to the hermetically sealed closure, the drain line 7 and the inner pipe 10 fill up air-free, which immediately creates the suction vacuum formation that

>■·

In the illustrated embodiment, the thickness is limited by the length of the inner tube 10.

The embodiment shown in Figure 2 shows a water drain through the roof edge finish 5, which in this case is provided with a further insulating layer 3' on its outside. The container 16' is designed as a container with a semicircular cross-section and fulfills the same function as the container 16 in the embodiment according to Figure 1. The drain opening 6' is the mouth opening of a discharge pipe 7' which is laid essentially horizontally with a slight angle of inclination and which opens into a vertical drain pipe 11. The inner pipe 10 in this embodiment is inserted into the drain pipe 11, which continues downwards as the outer pipe 12 and has the openings 13 for the air inlet above the end of the inner pipe 10.

In the embodiment shown in Figures 3 and 4, the inner tube 10 is designed as a retracted end section of the vertical

zo len drain pipe 11. The outer pipe 12 is a connecting pipe piece which continues the outer diameter of the vertical drain pipe 11 and which has the openings 13 for the air inlet above the lower end of the inner pipe 10. The vertical drain pipe 11 can be assembled in the usual way from several sections in a manner known per se, as the lower part of Figures 3 and 4 indicates.

In the embodiment shown in Figures 5 and 6, the inner pipe 10 of the vertical drain pipe 11 is only slightly retracted and is surrounded by an outer pipe 12 with the openings 13, which is formed as a widened long sleeve of a connecting pipe piece.

In the embodiment shown in Figures 7 and 8, the outer pipe 12 surrounding the inner pipe formed by a retracted end of the vertical drain pipe 11 has a lateral bulge 18 with a trapezoidal cross section, the

The top side forms the opening 13 for the entry of an air flow. The bulge 18 can also serve to attach the vertical drain pipe 11 to a wall via a fastening screw 20 screwed into a dowel 19.

In the embodiment shown in Figure 9, the inner tube 10 is formed by a piece of pipe of unchanged diameter which projects into an outer tube 12 formed by a widened sleeve. The outer tube 12 is provided on the inside with four ‘holders 21 on which the lower edge of the inner tube 10 rests. A radial distance between the end of the outer tube 12 and the outer surface of the inner tube 10 forms the opening 13 for the entry of the air flow.

is In the embodiment shown in Figures 10 to 12, the inner tube 10 is formed by a retracted end of a section of the vertical drain pipe 11 and is also provided with a radially inwardly directed V-shaped notched groove 22. The inner tube 10 thus formed projects into an outer tube 12 which continues the outer diameter of the vertical drain pipe 11. The notched grooves 22 surrounded by the outer tube 12, which are diametrically opposite one another, form the openings 13 for the inflow of air.

Figures 13 to 15 show an embodiment which corresponds to Figures 10 to 12 and illustrate that a plurality of openings 13 for air inlet can be provided over the length of the vertical drain pipe 11.

In all embodiments shown, a defined limitation of the suction effect is achieved by the defined length of the inner pipe 10 of the vertical drain pipe 11.

GRAMS, LINS & PARTNER GbR Li/sz ··· ·♦·· ·
« · · ·
· · · · · · ·
· · ·

Claims (7)

1. Water drain for sealed surfaces with a drainage device designed with a drainage opening ( 6 , 6 ') and a drainage pipe ( 11 ) connected to the drainage opening ( 6 , 6 '), which is dimensioned such that the drainage pipe ( 11 ) is filled to form a suction negative pressure for a greater drainage capacity, characterized in that the drainage pipe ( 11 ) has openings ( 13 ) at a predetermined height below its upper end, which allow air to enter but not water to escape. 2. Water drain according to claim 1, characterized in that the drain pipe ( 11 ) is double-walled in the region of the openings ( 13 ) with an inner pipe ( 10 ) without openings and that the air inlet occurs through a gap between the outer pipe ( 12 ) and the inner pipe ( 10 ) with a downstream air flow. 3. Water drain according to claim 2, characterized in that the outer tube ( 12 ) has openings ( 13 ) above the lower end of the inner tube ( 10 ). 4. Water drain according to one of claims 1 to 3, characterized in that the inner pipe ( 10 ) is designed as a retracted section of the drain pipe ( 11 ) and that the outer pipe ( 12 ) essentially continues the outer diameter of the drain pipe ( 11 ). 5. Water drain according to one of claims 1 to 4, characterized in that the outer pipe ( 12 ) is formed by a widened sleeve of a connecting pipe piece. 6. Water drain according to one of claims 1 to 5, characterized in that several spaced-apart openings ( 13 ) for air inlet are provided over the height of the drain pipe ( 11 ). 7. Water drain according to one of claims 1 to 6, characterized in that a container closed at the top is placed on the drain opening ( 6 , 6 '), the side wall ( 15 ) of which is provided with inlet openings ( 17 ) distributed over its circumference, the height of which is smaller than the height of the side wall ( 15 ) and that the container 16 , 16 ' is designed to be airtight above the inlet openings ( 17 ).