Emergency drain for dewatering an area

Abstract

An emergency drain for dewatering an area (F) accumulating water via a discharge opening ( 6 ) connected to a drainpipe ( 4 ), with which water dammed up above a minimum dammed height (H) can be led away, having a weir ( 7 ) for damming up the water up to the minimum dammed height (H) and a top wall ( 8 ) arranged at a distance from the discharge opening ( 6 ) to prevent air being sucked into a vortex forming in the discharge opening ( 6 ), the weir ( 7 ) being arranged around the discharge opening ( 6 ) and the top wall ( 8 ), as seen from the discharge opening ( 6 ), extending as far as the other side of the weir ( 7 ), is improved with regard to the flow performance and the development of noise by the fact that the weir ( 7 ) has a cross section which, at the base of the weir ( 7 ) resting on the area (F), is provided in the flow direction (S) with a substantially greater width than at the highest point of the weir ( 7 ) over which the water flows.

1 . Emergency drain for dewatering an area (F) accumulating water via a discharge opening ( 6 ) connected to a drainpipe ( 4 ), with which water dammed up above a minimum dammed height (H) can be led away, having a weir ( 7 ) for damming up the water up to the minimum dammed height (H) and a top wall ( 8 ) arranged at a distance from the discharge opening ( 6 ) to prevent air being sucked into a vortex forming in the discharge opening ( 6 ), the weir ( 7 ) being arranged around the discharge opening ( 6 ) and the top wall ( 8 ), as seen from the discharge opening ( 6 ), extending as far as the other side of the weir ( 7 ), characterized in that the weir ( 7 ) has a cross section which, at the base of the weir ( 7 ) resting on the area (F), is provided in the flow direction (S) with a substantially greater width than at the highest point of the weir ( 7 ) over which the water flows. 
   
   
       2 . Emergency drain according to  claim 1 , characterized in that the weir ( 7 ) has a triangular cross section in the flow direction (S). 
   
   
       3 . Emergency drain according to  claim 1 , characterized in that the weir ( 7 ) has a semicircular cross section in the flow direction (S). 
   
   
       4 . Emergency drain according to  claim 1 , characterized in that the weir ( 7 ) has a symmetrical cross section in the flow direction (S). 
   
   
       5 . Emergency drain according to  claim 1 , characterized in that the weir ( 7 ) has an asymmetrical cross section in the flow direction (S) with an upstream flank ( 12 ) and a downstream flank ( 13 ), the two flanks ( 12 ,  13 ) having an unequal length and mean steepness. 
   
   
       6 . Emergency drain according to  claim 5 , characterized in that the upstream flank ( 12 ) has a lower mean steepness. 
   
   
       7 . Emergency drain according to  claim 1 , characterized in that the weir ( 7 ) has an upstream flank ( 12 ) and a downstream flank ( 13 ) which are rectilinear over their entire length. 
   
   
       8 . Emergency drain according to  claim 1 , characterized in that the weir ( 7 ) has an upstream flank ( 12 ) and a downstream flank ( 13 ) and in that the flanks ( 12 ,  13 ) run rectilinearly over part of their length and merge into each other with a rounded intermediate piece ( 17 ) toward the highest point. 
   
   
       9 . Emergency drain according to  claim 1 , characterized in that, between the weir ( 7 ) and the discharge opening ( 6 ), flow guide webs ( 11 ) running radially toward a center line ( 10 ) of the discharge opening ( 6 ) are provided. 
   
   
       10 . Emergency drain according to  claim 9 , characterized in that the flow guide webs ( 11 ) extend as far as the top wall ( 8 ). 
   
   
       11 . Emergency drain according to  claims 1 , characterized in that the weir ( 7 ) is circular in plan view. 
   
   
       12 . Emergency drain according to  claim 9 , characterized in that the weir ( 7 ) is formed as a uniform polygon in plan view, and in that the flow guide webs ( 11 ) extend in the direction of the corners. 
   
   
       13 . Emergency drain according to  claim 12 , characterized in that the weir ( 7 ) is formed as a uniform hexagon in plan view. 
   
   
       14 . Emergency drain according to  claims 1 , characterized in that the height of the weir ( 7 ) extends until it is above half the spacing (A) between the area (F) and the top wall ( 8 ). 
   
   
       15 . Emergency drain according to  claim 14 , characterized in that the height of the weir ( 7 ) extends until it is above two-thirds of the spacing (A) between the area (F) and the top wall ( 8 ). 
   
   
       16 . Emergency drain according to  claim 1 , characterized in that the top wall ( 8 ) is formed as a level disk. 
   
   
       17 . Emergency drain according to  claim 1 , characterized in that the top wall ( 8 ) has the shape of the weir ( 7 ) in plan view and thus projects outward uniformly along the weir ( 7 ). 
   
   
       18 . Emergency drain according to  claim 1 , characterized in that it is conceived as a non-pressure drain.