DE20012282U1 - Street inlet for surface water to be drained - Google Patents

Description

Description

10

15

The invention relates to an inlet box for a street inlet for surface water, in particular rain water.

Street drains that are diverted into separate systems increasingly require cleaning before they can be safely discharged into waterways. The street drains or gullies that have been used up to now no longer meet these requirements. They either only retain coarse materials or do not have a sufficient settling effect.

One way to purify water is to use ground filter basins, but in landscapes with a low gradient, these require a powerful pumping station. Such a pumping station makes rainwater treatment significantly more expensive, both in terms of investment and operating costs.

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The object of the present invention is to provide a street drain of the type described above, with which rainwater can be cleaned in a free gradient.

This object is achieved by the measures of claim 1, in particular by a street inlet for surface water, with a cuboid-shaped, longitudinal inlet box which is at least partially filled with a filter material and which has a gradient and which is provided with a drain pipe in the region of its lowest gradient point, the drain pipe is guided through the filter material and is provided with perforations in the region of the filter material and the inlet box further has a cover provided with water inlet openings.

The cover is supported by the walls of the inlet box, which are designed to withstand vertical and horizontal forces.

These measures create a street drain, where the rainwater that runs off above ground flows through gutters or into gutters along the high curbs on the street side via the inlet openings of the elongated cover into the free space of the drain box. Here it can be roughly cleaned of coarse materials such as leaves, cigarette butts and other rubbish by an inserted catch basket and can seep through the filter material in the direction of the slope. The rainwater to be drained off reaches either a sewer system or a subsequent drainage system via the perforations in the drain pipe.

Further advantageous measures are described in the subclaims. The invention is described in the attached

Drawing and is described in more detail below; it shows:

Figure 1 shows the longitudinal section through an inlet box, with filter material, perforated drain pipe, collecting basket and load-bearing

cover;

Figure 2 shows the cross-section through an inlet box, along the line AA in Figure 1;

Figure 3 is a top view of an inlet box according to Figure 1.

The street inlet shown in Figures 1 and 2

10 essentially consists of an inlet box 11, which rests with its inlet box base 12 on a sub-concrete 13. The inlet box base 12 is provided with a gradient 15 to the inlet box low point 14 which is the lowest in the direction of flow.

As Figures 2 and 3 show, the inlet box

11 is arranged in the course of a street-side rainwater drain, for example a paving gutter 21.

It is provided with a cover 16, one side of which is flush with the high curb 20 of the road paving. The cover 16 is connected to the inlet box 11 with locks 32 that can only be opened with a special key. This prevents unauthorized removal of the cover 16 and opening of the inlet box 11.

The inlet box 11 is rectangular in plan view and has a significantly greater length than width. The inlet box length 33 is approximately five to twenty-five times greater than the inlet box width 34, preferably it is approximately ten times as large.

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The cover 16 is provided with transverse water inlet openings 17 and rests on the side walls 31 of the inlet box 11. The side walls 31 and the covers 16 have a sufficiently high load-bearing capacity in both the horizontal and vertical directions.

As Figure 1 further shows, a drainage mat 18 is arranged on the inlet box base 12, onto which a filter material 19 is filled up to half the height of the side walls 31. This partial filling creates a free storage space 22 above the filter material 19.

In the area of the inlet box low point 14, a drain pipe 24 is guided through the filter material 19. The drain pipe 24 is provided with a perforation 25 to ensure water drainage up to just below the upper edge 35 of the filter material 19. The drain pipe 24 is led through the inlet box base 12 into a sewer or trench 26 (not shown in detail).

The upper free end 27 of the drain pipe 24 is covered with a cover 28. The cover 28 is located directly below the underside of the cover 16 and is provided with a projection 29. Between the upper free end 27 of the drain pipe 26 and the cover 28 there is a free space 30 through which overflowing water enters the drain pipe 24 according to the baffle principle. The cover 28 therefore functions as an oil separator when water overflows and prevents oil, fuel residues or similar pollutants from flowing into the sewer system.

To collect coarse materials such as leaves, small branches, cigarette packets, butts, paper, etc., the

A collecting basket 23 is inserted into the storage space 22. The collecting basket 23 runs in the longitudinal direction of the inlet box 11 and is folded in a V-shape in the longitudinal direction. It consists of a perforated material, preferably of a steel sheet.

Due to its V-shaped fold, the coarse material initially collects at the bottom of the collecting basket 23. The perforations 36 in the upper area of the side surfaces of the collecting basket 23 therefore remain sufficiently permeable to water even after a long period of operation. The cleaning periods can thus be extended and the maintenance effort reduced.

The water, which has been freed of coarse material in this way, can seep through the filter material 19 in the direction of the drain pipe 24 provided at the bottom point 14 of the inlet box. It then reaches the sewer system 26 or a drainage system via the perforations 25 of the drain pipe 24. The drainage mat 13 laid on the bottom of the inlet box 12 supports the horizontal component of the seepage.

By filtering in such an inlet box 11, a large part of the entrained, settleable substances and also a part of the dissolved substances are removed from the rainwater runoff and retained in the filter material 19. Depending on the intensity of the rain, the filter material 19 must be periodically cleaned or replaced, but the effort required for this is relatively low.

If, during heavy rain, the water overflows above the upper edge 27 of the drain pipe 26, a certain amount may enter the sewerage system 26 unfiltered, but the overhang 29 prevents

Any oil or similar that may be carried along can also flow away unhindered.

There is a direct connection between the permeability of the filter material 19, the dimensions of the inlet box 11 and the frequency of overflow. The desired cleaning performance according to the annual rainfall balance or the frequency of fully treated events can be influenced by the choice of the filter material 19, its grain composition and the dimensions of the inlet box 11.

Reference symbols

10 Street inlet

11 Inlet box

12 Inlet box sole

13 Sub-concrete

14 Low point

15 gradients

16 Cover

17 Water inlet opening

18 Drainage mat

19 filter material 2 0 high side

21 Paved gutter

22 storage space

23 Catch basket

24 Drain pipe

25 Perforations

26 Sewerage/Drain

27 upper end

28 Lids

2 9 Overhang

30 Free space

31 Box wall

32 Closure

33 Inlet box length

34 Inlet box width

35 Top edge

36 Perforations

Claims (20)

1. Street inlet for surface water, with a cuboid-shaped, longitudinal inlet box ( 11 ) which is at least partially filled with a filter material ( 19 ), which has a gradient ( 15 ) and which is provided with a drain pipe ( 24 ) in the region of its lowest gradient point ( 14 ), the drain pipe ( 24 ) is guided through the filter material ( 19 ) and is provided with perforations ( 25 ) in the region of the filter material ( 19 ), and the inlet box ( 11 ) further has a cover ( 16 ) provided with water inlet openings ( 17 ). 2. Street inlet according to claim 1, characterized in that the cover ( 16 ) is held by the walls ( 31 ) of the inlet box ( 11 ). 3. Street inlet according to claims 1 and 2, characterized in that the inlet box base ( 12 ) has a gradient ( 15 ). 4. Street inlet according to claims 1 to 3, characterized in that the length ( 33 ) of the inlet box ( 11 ) is substantially greater than its width ( 34 ). 5. Street inlet according to claims 1 and 4, characterized in that the length ( 33 ) of the inlet box ( 11 ) is approximately five to twenty-five times, preferably ten times, as large as its width ( 34 ). 6. Street inlet according to claims 1 to 5, characterized in that the inlet box ( 11 ) is at least partially provided with a filter material ( 19 ). 7. Street inlet according to claims 1 and 6, characterized in that a drainage mat ( 18 ) is provided on the inlet box base ( 12 ) under the filter material ( 19 ). 8. Street inlet according to claims 1 to 7, characterized in that a storage space ( 22 ) is provided between the upper edge ( 35 ) of the filter material ( 19 ) and the cover ( 16 ). 9. Street inlet according to claims 1 to 8, characterized in that a collecting basket ( 23 ) extending in the longitudinal direction is inserted into the inlet box ( 11 ) above the storage space ( 22 ). 10. Street inlet according to claims 1 and 9, characterized in that the collecting basket ( 23 ) is folded in a V-shape in the longitudinal direction. 11. Street inlet according to claims 1 and 9, characterized in that the collecting basket ( 23 ) has perforations ( 36 ). 12. Street inlet according to claims 1 to 11, characterized in that the cover ( 16 ) is detachably connected to the inlet box ( 11 ) by means of closures ( 32 ). 13. Street inlet according to claims 1 to 12, characterized in that the drain pipe ( 24 ) is provided with perforations ( 25 ) in the region of the filter material ( 19 ). 14. Street inlet according to claims 1 to 13, characterized in that the drain pipe ( 24 ) is covered with a cover ( 28 ) having a projection ( 29 ). 15. Street inlet according to claims 1 and 14, characterized in that the projection ( 29 ) of the cover ( 28 ) opposite the upper end ( 27 ) of the drain pipe ( 24 ) is provided with a free space ( 30 ) according to the baffle principle. 16. Street inlet according to claims 1, 14 and 15, characterized in that the cover ( 28 ) extends to the underside of the cover ( 16 ) of the inlet box ( 11 ). 17. Street inlet according to claims 1 to 16, characterized in that the drain pipe ( 24 ) is guided through the inlet box base ( 12 ) in the region of the inlet box low point ( 14 ) and can be connected to a sewer system ( 26 ). 18. Street inlet according to claims 1 to 17, characterized in that the cover ( 16 ) can be installed in the course of a paving gutter ( 21 ). 19. Street inlet according to claims 1 to 18, characterized in that the cover ( 16 ) is supported by the walls ( 31 ) of the inlet box ( 11 ). 20. Street inlet according to claims 1 to 19, characterized in that the walls ( 31 ) of the inlet box ( 11 ) are designed to be sufficiently resilient against vertical and horizontal forces.