Dimpled sheet

Abstract

A dimpled sheet, with a flat area and a plurality of dimples protruding over the flat area, each having a dimple casing and a dimple cover, wherein contact surfaces for placement of the dimpled sheet against a subsurface are formed on the side of the dimples by the outer sides of the dimple covers. The proportion of the total contact surface of all dimples of the total surface of the dimpled sheet is greater than 35%, with the base surface of the dimpled sheet being formed from the flat area and the base surface of all dimples at the level of the flat area. The dimpled sheet has a protection coefficient (PC) of more than 10.000, whereby the PC is: PC= ( CS ) 2 ×DH with CS=total contact surface of all dimples in [%] of the total base surface of the dimpled sheet DH=dimple height [min].

1 . Dimpled sheet, particularly for construction purposes and preferably for use as foundation wall protection or drainage sheeting, with a flat area and a plurality of dimples protruding over the flat area, each having a dimple casing and a dimple cover, wherein contact surfaces for placement of the dimpled sheet against a subsurface are formed on the side of the dimples by the outer sides of the dimple covers, wherein the proportion of the total contact surface of all dimples of the total surface of the dimpled sheet is greater than 35%, wherein the base surface of the dimpled sheet is formed from the flat area, having a protection coefficient (PC) of more than 10.000, whereby the protection coefficient (PC) is defined by the formula
     PC =( CS ) 2   ×DH      
     with
 CS=total contact surface of all dimples in [%] of the total base surface of the dimpled sheet 
 DH=dimple height in [min] 
 
   
   
       2 . Dimpled sheet as set forth in  claim 1 , wherein the protection coefficient (PC) is more than 12.000 and especially more than 16.000,00. 
   
   
       3 . Dimpled sheet as set forth in  claim 1 , wherein a compressive strength per DIN 53454 of between 50 to 1500 kPa, preferably between 150 to 1000 kPa, and particularly between 300 to 700 kPa is provided. 
   
   
       4 . Dimpled sheet as set forth in  claim 1 , wherein an sd value per EN 1931 of greater than 2 m, preferably greater than 50 m and especially preferably greater than 100 m and particularly greater than 500 m is provided. 
   
   
       5 . Dimpled sheet as set forth in  claim 1 , wherein the total contact surface of all dimples is up to 80% of the base surface of the dimpled sheet, preferably between 40 and 70% and particularly between 45 and 60%. 
   
   
       6 . Dimpled sheet as set forth in  claim 1 , wherein the free volume between the dimples lies in the range between 500 to 10,000 mm 3 /m 2 , preferably between 1000 to 7000 mm 3 /m 2  and particularly between 1500 and 4000 mm 3 /m 2 . 
   
   
       7 . Dimpled sheet as set forth in  claim 1 , wherein dimples each with a first contact surface and other dimples each with another contact surface deviating from the first contact surface are provided and that the dimples and the other dimples have contact surfaces of different shapes and/or sizes. 
   
   
       8 . Dimpled sheet as set forth in  claim 1 , wherein the dimples and the other dimples are arranged alternatingly next to each other, in each case at least with respect to the level of the contact surfaces. 
   
   
       9 . Dimpled sheet as set forth in  claim 1 , wherein the dimples are arranged in a regular raster and that the other dimples are provided in empty spaces of the raster, in each case at least with respect to the level of the contact surfaces. 
   
   
       10 . Dimpled sheet as set forth in  claim 1 , wherein the dimples are framed by the other dimples, in each case at least with respect to the level of the contact surfaces. 
   
   
       11 . Dimpled sheet as set forth in  claim 1 , wherein the dimples with respectively circular contact surfaces and other dimples are each provided with an n-cornered contact surface. 
   
   
       12 . Dimpled sheet as set forth in  claim 1 , wherein the dimples and neighboring other dimples have contact surfaces which are complementary to each other at least in sections. 
   
   
       13 . Dimpled sheet as set forth in  claim 1 , wherein the dimples are each provided with an ellipsoid contact surface and that each contact surface preferably has a narrowing in its middle area. 
   
   
       14 . Dimpled sheet as set forth in  claim 1 , wherein the dimple height is between 3 to 15 mm, particularly between 3 to 10 mm, more particularly between 3 to 7 mm. 
   
   
       15 . Dimpled sheet as set forth in  claim 1 , wherein the contact surfaces have an edge length or a diameter of 3 to 30 mm. 
   
   
       16 . Dimpled sheet as set forth in  claim 1 , wherein the wall thickness of the dimples is between 0.1 to 1.0 mm, particularly between 0.3 to 0.6 mm.