Diaphragm wall cutter and method for cutting a cutting trench in the ground

Abstract

The invention relates to a diaphragm wall cutter for cutting a cutting trench in the ground, comprising a cutting frame, at least one rotatably drivable cutting wheel which is mounted on an lower side of the cutting frame, a suction nozzle, which is arranged in the region of the at least one cutting wheel and is provided with at least one suction opening, and a suction pump which is configured for suctioning slurry from the cutting trench during cutting via the suction nozzle, the suction pump being connected to the suction nozzle via a suction line. According to the invention, it is provided that at least one filling port is provided for filling the suction pump and the suction line with a liquid when the suction line is shut-off, wherein the suction line and the suction pump are filled with liquid for starting the suction pump.

1 . Diaphragm wall cutter for cutting a cutting trench in the ground, comprising
 a cutting frame,   at least one rotatably-drivable cutting wheel which is mounted on a lower side of the cutting frame,   a suction nozzle which is arranged in the region of the at least one cutting wheel and is provided with at least one suction opening, and   a suction pump which is configured for suctioning slurry out of the cutting trench during cutting via the suction nozzle, wherein the suction pump is connected to the suction nozzle via a suction line,   
       characterized in
 that at least one filling port for filling the suction pump and the suction line with a liquid is provided, wherein the suction line and the suction pump are filled with liquid for starting the suction pump. 
 
     
     
         2 . Diaphragm wall cutter according to  claim 1 ,
 wherein   a shut-off device is provided, by means of which the suction line can be shut-off downwards to the cutting trench, and   that the shut-off device comprises a locking element which is mounted in a manner adjustable between a shut-off position and a flow position.   
     
     
         3 . Diaphragm wall cutter according to  claim 2 ,
 wherein   the locking element is adjustable, in particular displaceable or pivotable, between the shut-off position and the flow position by means of an actuating drive.   
     
     
         4 . Diaphragm wall cutter according to  claim 2 ,
 wherein   the locking element is arranged on the suction nozzle or on the suction line.   
     
     
         5 . Diaphragm wall cutter according to  claim 2 ,
 wherein   the shut-off device comprises at least one closing cover which can be loosened when the suction pump starts up.   
     
     
         6 . Diaphragm wall cutter according to  claim 5 ,
 wherein   the at least one closing cover is configured as a one-way element which can be released by extraction when the suction pump starts up.   
     
     
         7 . Diaphragm wall cutter according to  claim 5 ,
 wherein   the closing cover is formed with a degradable material, in particular a biopolymer plastic.   
     
     
         8 . Diaphragm wall cutter according to  claim 1 ,
 wherein   the filling port is arranged at or above the suction pump.   
     
     
         9 . Diaphragm wall cutter according to  claim 1 ,
 wherein   a filling pump is provided, through which a defined quantity of liquid can be supplied for filling.   
     
     
         10 . Diaphragm wall cutter according to  claim 1 ,
 wherein   liquid can be supplied into the suction pump and the suction line prior to start-up of the suction pump, when the suction line is open downwards, in a quantity such that said line and pump are filled for starting the suction pump.   
     
     
         11 . Diaphragm wall cutter according to  claim 10 ,
 wherein   a control device is provided, which is configured to stop filling when the suction pump is started.   
     
     
         12 . Diaphragm wall cutter according to  claim 11 ,
 wherein   the control device directly controls the filling pump and/or a valve device at the filling port.   
     
     
         13 . Diaphragm wall cutter according to  claim 1 ,
 wherein   a display device is provided, which displays a filling state of the suction pump.   
     
     
         14 . Method of cutting a cutting trench in the ground by means of a diaphragm wall cutter according to  claim 1 ,
 wherein   that the suction pump and the suction line are filled with a liquid via the filling port before the suction pump is started.   
     
     
         15 . Method according to  claim 14 ,
 wherein   a guide trench is created, which is filled with slurry, and   that the diaphragm wall cutter is inserted into the guide trench for cutting, wherein the cutting operation is started even before the suction pump is completely immersed in the slurry.   
     
     
         16 . Method according to  claim 14 ,
 wherein   that the suction line is shut-off downwards to the cutting trench by means of a shut-off device prior to the start of cutting, and   that the shut-off device is opened when said device is immersed in the slurry, wherein the suction line is filled with liquid.   
     
     
         17 . Method according to  claim 14 ,
 wherein   that the shut-off device is opened when the suction pump has reached a rotational speed required for suctioning or built-up a negative pressure required for extraction.   
     
     
         18 . Method according to  claim 14 ,
 wherein   that liquid is supplied into the suction pump and the suction line by means of a filling pump, when the suction line is open downwards, in a quantity such that the suction pump and the suction line are filled when the suction pump is started.