Drainage System And Modular Drainage Element

Abstract

This invention relates to a drainage system for use in the ground ( 3 ) below ground level ( 4 ). The system comprises at least one module drainage element ( 2 ) provided with a storage space ( 5 ). The storage space is at least partly surrounded by a filter fabric ( 6 ) provided with at least two zones ( 12, 15 ) which are provided with mutually different liquid-permeability.

1 . Drainage system, for use in the ground ( 3 ) below ground level ( 4 ), the system comprises:
 at least one modular drainage element ( 2 ) provided with a storage space ( 5 ), the storage space is at least partly surrounded by a filter fabric ( 6 ) provided with at least two zones ( 12 ,  15 ), which zones are provided with a mutually different liquid-permeability.   
     
     
         2 . Drainage system according to  claim 1 , wherein the at least two zones of the filter fabric ( 6 ) having mutually different liquid-permeability are provide in a pattern. 
     
     
         3 . Drainage system according to  claim 1 , wherein the filter fabric ( 6 ) is provided with at least one zone having a gradually changing liquid-permeability. 
     
     
         4 . Drainage system according to  claim 1 , wherein the filter fabric ( 6 ) is provided with a zone having a lower liquid-permeability by means of application of a liquid-repellent coating. 
     
     
         5 . Drainage system according to  claim 1 , wherein one of the at least two zones in the filter fabric ( 6 ) is liquid-impermeable. 
     
     
         6 . Drainage system according to  claim 1 , wherein the filter fabric ( 6 ) entirely surrounds the storage space ( 5 ). 
     
     
         7 . Drainage system according to  claim 6 , wherein the filter fabric ( 6 ) is folded from a filter fabric ( 6 ) provided with a bottom side ( 12 ), two side walls ( 13 ), two end faces ( 14 ), and a cover side ( 15 ). 
     
     
         8 . Drainage system according to  claim 7 , wherein the filter fabric ( 6 ), the bottom side ( 12 ) and the two end faces ( 14 ) form a zone having a liquid-permeability which is between 0% and 20%, and wherein the side walls ( 13 ) form zones which are provided with a gradually changing liquid-permeability having a lower limit which is between 0% and 20% liquid-permeability and having an upper limit which is between 25% and 100% liquid-permeability, and wherein the cover side ( 15 ) forms a zone with a liquid-permeability which is between  80  and 100%. 
     
     
         9 . Drainage system according to  claim 6 ,wherein the filter fabric ( 6 ) has a bag shape, obtained by folding the filter fabric over a fold line ( 47 ) and by joining together the side edges in pairs ( 37   a  &  37   b ) and ( 37   c  &  37   d ). 
     
     
         10 . Drainage system according to  claim 9 , wherein the bag shape is turned inside out, so that tip portions ( 40 ,  41 ,  35 ), folded onto each other, are extending inside the bag shape. 
     
     
         11 . Drainage system according to  claim 1 , wherein the filter fabric ( 6 ) is a non-woven. 
     
     
         12 . Drainage system according  claim 1 , wherein the storage space ( 5 ) of a at least one modular drainage element ( 2 ) at least partly is filled with a porous, liquid-absorbing material. 
     
     
         13 . Drainage system according to  claim 12 , wherein basis of the liquid-absorbing material is selected from the group consisting of: foamed formaldhyde resin, mineral wool, modified mineral wool with a hydrophilic binder, natural and synthetic sponge material, and woven and non-woven textile material. 
     
     
         14 . Drainage system according to  claim 1 , wherein a drainage conduit ( 8 ) is provided in the storage space ( 5 ) of the at least one modular drainage elements ( 2 ), through which conduit liquid can be transported in and out of the at least one modular drainage element. 
     
     
         15 . The drainage element for use in the drainage system ( 1 ) according to  claim 1 .