DE29923191U1 - Road drainage system close to nature - Google Patents

Description

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Engineering company 8-2346/00

Prof. Dr. Sieker mbH February 18, 2000

Berliner Str. 71
15366 Dahlwitz-Hoppegarten

Natural road drainage system Honor

The invention relates to a road drainage system for collecting precipitation.

Due to the extensive surface sealing, rainwater in densely populated urban areas is mainly channeled into the sewer system and disposed of with the wastewater. The disposal capacity of the sewer systems must therefore be geared to large amounts of precipitation, which results in high costs for their operation and the associated sewage treatment plants. The runoff of rainwater also deprives populated areas, communities, towns and villages of an important ecological and economic resource. A combined trough and trench infiltration system has therefore already been proposed in F. Sieker: "Naturnahe Regenwasserbewirtschaftung", Stadtökologie, Vol. 1.

For this purpose, a hollow is filled with topsoil, which is laid on a coarse-grained filling material. The hollow merges smoothly into the top edge of the ground, and in

A drainage pipe following the course of the road can be arranged above the depression bottom in order to fill the coarse-grained material.

The object of the present invention is to collect precipitation from sealed surfaces, in particular roads, over a large area, to clean it and to use it as surface water.

This task is solved by an infiltration area with an edge, flow-connected to an above-ground rainwater inlet, designed as a deep bed, which is provided with a topsoil cover and an underlying trench filled with highly porous material, into which a drainage pipe is inserted following the course of the road.

These measures make sustainable precipitation management possible, particularly in newly developed residential areas. The precipitation, especially the rainwater, is cleaned by passing through the topsoil, with the cleaning performance in terms of relevant parameters being up to approx. 95%.

The infiltration capacity can be changed according to the desired retention effect using adjustable throttle devices. The drainage capacity for the road substructure can also be adjusted and varied using the drainage effect of the system.

To protect the adjacent building basements or the road substructure from waterlogging by any existing groundwater, the drainage effect of the road drainage system can be varied. If the rainwater cannot or should not seep into undeveloped areas, the excess water can be drained off by a river.

The construction of central retention basins can be eliminated or significantly reduced. The water balance of built-up areas can be largely brought into line with the undeveloped state through these measures.

The infiltration areas of the system are now planted sunken beds with an edged border, which can be arranged within the road surface as roadside greenery in the sense of traffic calming measures. Previously, the infiltration areas were created as sloped hollows in the road space. The angular border of the sunken beds significantly increases the available storage space per unit of floor area compared to the sloped hollows.

Furthermore, it is possible to significantly reduce the size of the base area of the deep beds or infiltration areas compared to the base area of the existing troughs. The latter generally extend over the entire length of the underlying trenches, while the deep beds only extend over a fraction of the longitudinal development of the trenches.

This reduction in the surface area makes it necessary to specify and maintain a certain soil structure within the deep beds in view of the necessary infiltration and purification performance in relation to the precipitation inflows. This soil structure is described by the grain size distribution curve and the layer thickness specification in each individual case.

The deep beds are mandatorily arranged at the upper end of the respective trench to ensure complete filling and inflow of the horizontal or vertical drainage systems.

to achieve high infiltration performance by using trenches arranged with only a slight gradient.

The low position of the longitudinal development of the trenches and the drainage pipes located therein ensure sufficient drainage of the road substructure across its entire width.

The subgrade of the road substructure is inclined with a transverse gradient towards the side of the road on which the infiltration area is located. The infiltration area can be located closer to one side of the road than the other.

A damming of the road substructure by filling the trench is prevented by means of a retaining wall apron that can be overflowed. The retaining wall apron is installed transversely to the trench if the road gradient is present. The trench can be fully dammed without being overflowed by the trench overflow within a throttle shaft.

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

Drawing and is described in more detail below
^v -"'; it shows:

Figure 1 shows the top view of a road drainage system, with an edged infiltration area and above-ground, rin

a shaped precipitation inflow;

Figure 2 shows the longitudinal section through a road drainage system according to Figure 1, with overflow shaft, gravel trench with horizontal trench base, longitudinal drainage

Drainage pipe and edged infiltration area with topsoil cover;

Figure 3 shows the section through a road drainage system according to Figure 1, corresponding to the overflow shaft laid

Section line A-A' in Figure 2;

Figure 4 shows the section through a street drainage system according to Figure 1, corresponding to the section line BB' in Figure 2 placed above the infiltration area;

Figure 5 shows the section through a road drainage system according to Figure 1, corresponding to the section line CC in Figure 2 placed below the infiltration area.

The street drainage system 10 shown in Figures 1, 2, 3, 4 and 5 essentially consists of an infiltration area 11 which is designed as a sunken bed. The infiltration area 11 is surrounded by an angular border 12.

As Figures 2 and 3 show, the kc.it enclosure 12 consists of angle support elements 13, the horizontally extending angle legs 13a of which are arranged pointing away from the infiltration surface 11.

An overflow shaft 14 is provided in the infiltration area 11, which also serves as a control and throttling shaft.

As shown in Figure 2, the underground part of the road drainage system 10 consists of a trench or trench filled with porous material, for example a gravel trench 17, in which a

a correspondingly dimensioned drain pipe 19 is inserted lengthwise. The trench base 18 runs essentially horizontally.

The gravel trench 17 is covered at the top with a geotextile cover 24, on which a sand filling 25 and above which a topsoil filling 26 are provided. The topsoil 26 can support a roadside greenery 15.

The sand filling 25 partly and the topsoil filling

26 are completely surrounded by the angle support elements 13 of the enclosure 12. Outside the enclosure 12, a normal road structure 27 is provided, which is covered, for example, with a pavement 28, an asphalt surface or the like. The road structure

27 has a longitudinal gradient 23.

As Figure 1 further shows, street drains designed as longitudinal shallow channels are embedded in the street pavement 28. The street drains are designed as precipitation inlets 16 and are introduced above ground into the infiltration areas 11.

In one embodiment, for example, transverse precipitation inlets 16a coming from private properties and the like can be provided, which are introduced into the longitudinal precipitation inlets 16 before reaching the infiltration areas 11. Downstream of the infiltration area 11, precipitation inlets 16b begin, which lead to the next infiltration area, not shown.

As Figures 2 and 3 further show, an inlet drainage pipe 20 is provided in the overflow shaft 14. The inlet drainage pipe 20 is provided with a raised drainage pipe outlet 21 through which precipitation in

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can flow into the overflow shaft 14. Below the inlet drainage pipe 20, the mouth of an outlet drainage pipe 19 is provided.

In order to prevent the road substructure from being blocked by filling the gravel trench 17, a retaining wall apron 22 is provided upstream of the infiltration area 11. The retaining wall apron 22 is installed transversely to the gravel trench 17 if there is a longitudinal road gradient 23.

The retaining wall apron 22 can be overflowed and can reach the full filling of the gravel trench 17. The drainage pipe outlet 21, which serves as a trench overflow and is arranged in a cascading manner within the overflow shaft 14, prevents the gravel trench 17 from being overfilled.

As Figures 4 and 5 show, the infiltration areas 11 with their underground gravel trenches 17 are arranged outside the middle of the road on one side of the road 29. The road pavement 28 is inclined with a transverse gradient 23a towards the infiltration area 11.

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Reference symbol

Street drainage system Infiltration area Edging Angle support element Angle leg Overflow shaft Roadside greenery Rainfall inlet, street Rainfall inlet, private property Downstream rainflow inlet Gravel trench Trench base Drainage pipe Inlet drain pipe Drain pipe outlet Retaining wall apron Longitudinal gradient Transverse gradient Geotextile cover Sand filling Topsoil filling Road structure Road paving Road side

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Claims (18)

1. Street drainage system for collecting precipitation, characterized by an infiltration surface ( 11 ) which is edged and designed as a deep bed and is connected to an above-ground precipitation inlet ( 16 ), which is provided with a topsoil cover ( 26 ) and an underlying trench ( 17 ) filled with highly porous material, into which a drainage pipe ( 19 ) following the course of the street is inserted. 2. Road drainage system according to claim 1, characterized in that the trench filled with highly porous material is a gravel trench ( 17 ). 3. Road drainage system according to claims 1 and 2, characterized in that the edged border ( 12 ) consists of angle support elements ( 13 ) whose angle legs ( 13a ) are arranged pointing away from the infiltration surface ( 11 ). 4. Road drainage system according to claims 1 to 3, characterized in that the gravel trench ( 17 ) is provided on its upper side with a geotextile covering ( 24 ). 5. Road drainage system according to claims 1 to 4, characterized in that the gravel trench ( 17 ) has a substantially horizontally extending trench base ( 18 ). 6. Road drainage system according to claims 1 to 5, characterized in that a sand filling ( 25 ) is provided between the topsoil cover ( 26 ) and the geotextile cover ( 24 ) of the gravel trench ( 17 ). 7. Road drainage system according to claims 1 to 6, characterized in that the sand filling ( 25 ) and the overlying topsoil covering ( 26 ) are surrounded by the angular border ( 12 ). 8. Road drainage system according to claims 1 to 7, characterized in that the angular border ( 12 ) stands on the gravel trench ( 17 ). 9. Road drainage system according to claims 1 to 8, characterized in that the infiltration area ( 11 ) designed as a deep bed can be planted with roadside greenery ( 15 ). 10. Road drainage system according to claims 1 to 9, characterized in that an overflow shaft ( 14 ) is assigned to the infiltration surface ( 11 ). 11. Road drainage system according to claims 1 and 10, characterized in that an inlet drainage pipe ( 20 ) with a cascading drainage pipe outlet ( 21 ) opens into the overflow shaft ( 14 ). 12. Road drainage system according to claims 1 to 11, characterized in that the overflow shaft ( 14 ) below the inlet drainage pipe ( 20 ) is fluidly connected to an outlet drainage pipe ( 19 ) leading downstream through the gravel trench ( 17 ). 13. Road drainage system according to claims 1 to 12, characterized in that the above-ground precipitation inlet ( 16 ) leading into the infiltration area ( 11 ) is let into the road pavement ( 28 ) in the form of a channel. 14. Road drainage system according to claims 1 and 13, characterized in that transverse precipitation inlets ( 16a ) are fluidly connected to the longitudinal, above-ground precipitation inlet ( 16 ). 15. Road drainage system according to claims 1 to 14, characterized in that the longitudinal, above-ground precipitation inlet ( 16 ) is provided with a gradient ( 23 ) relative to the horizontally running infiltration surface ( 11 ). 16. Road drainage system according to claims 1 to 15, characterized in that a retaining wall apron ( 22 ) is assigned to the inlet drainage pipe ( 20 ) upstream of the infiltration surface ( 11 ). 17. Road drainage system according to claims 1 to 16, characterized in that the infiltration surfaces ( 11 ) are provided off-center of the road. 18. Road drainage system according to claims 1 to 17, characterized in that the transverse precipitation inlets ( 16a ) are inclined with a transverse gradient ( 23a ) towards the road side ( 29 ) provided with an infiltration surface ( 11 ).