Method and device for producing a foundation element in the ground

Abstract

The invention relates to a method and to a device for creating a foundation element in the ground, wherein ground material is removed by means of a drilling tool and a borehole is created, into which a pile pipe and a curable medium are introduced. The borehole is created having a boring diameter that is greater than an outside diameter of the pile pipe by a specified amount, wherein an annular space is formed between a borehole wall and an outer face of the pile pipe. The removed ground material is conveyed in an interior of the pile pipe, while the annular space is kept substantially free of removed ground material. The curable medium is introduced into the annular space in order to anchor the pile pipe in the ground.

1 . Method for producing a foundation element in the ground, in particular in a bed of a body of water, in which ground material is removed by means of a drilling tool ( 20 ) and a borehole is produced, into which a pile tube ( 10 ) and a hardenable medium are introduced, 
       characterized in that
 the borehole is produced with a drilling diameter which is, by a specified amount, larger than an external diameter of the pile tube ( 10 ), wherein an annular space ( 8 ) is formed between a borehole wall ( 5 ) and an external face of the pile tube ( 10 ), in that the removed ground material is conveyed into an internal space ( 14 ) of the pile tube ( 10 ) while the annular space ( 8 ) is kept substantially free of removed ground material, and 
 in that the hardenable medium is fed into the annular space ( 8 ) in order to anchor the pile tube ( 10 ) in the ground. 
 
     
     
         2 . Method according to  claim 1 , 
       characterized in that
 the removed ground material is mixed with a fluid, in particular water, which is fed into a lower area of the borehole. 
 
     
     
         3 . Method according to  claim 2 , 
       characterized in that
 the removed and mixed ground material is conveyed at least partially through the pile tube ( 10 ) out of the borehole. 
 
     
     
         4 . Method according to  claim 1 , 
       characterized in that
 the drilling tool ( 20 ) is driven in a rotating manner by means of a drill rod ( 26 ) which is arranged inside the pile tube ( 10 ), and 
 in that via the drill rod ( 26 ) fluid is fed into the lower area of the borehole and/or removed ground material is discharged from the borehole. 
 
     
     
         5 . Method according to  claim 1 , 
       characterized in that
 the hardenable medium is fed into a lower area of the annular space ( 8 ). 
 
     
     
         6 . Method according to  claim 1 , 
       characterized in that
 the introduction of the pile tube ( 10 ), the removal of the ground material, the feeding-in of the fluid and/or the feeding-in of the hardenable medium take place simultaneously. 
 
     
     
         7 . Method according to  claim 1 , 
       characterized in that
 for removal of ground material inside the pile tube ( 10 ) a drilling means ( 50 ) is secured on the pile tube ( 10 ) which has a drive means ( 52 ) for driving the drilling tool ( 20 ) in a rotating manner. 
 
     
     
         8 . Method according to  claim 1 , 
       characterized in that
 after anchoring the pile tube ( 10 ) in the ground, removed ground material remains inside the pile tube ( 10 ). 
 
     
     
         9 . Method according to  claim 4 , 
       characterized in that
 after sinking of the borehole the drill rod ( 26 ) is separated from the drilling tool ( 20 ) at the lower end of the pile tube ( 10 ), wherein the drilling tool ( 20 ) remains in the ground as a lost drilling tool ( 20 ). 
 
     
     
         10 . Device for producing a foundation element in the ground, in particular according to  claim 1 , comprising a drilling means ( 50 ) with a drilling tool ( 20 ) for removing ground material below a pile tube ( 10 ) which can be introduced into the ground as part of the foundation element, 
       characterized in that
 for the production of a borehole the drilling tool ( 20 ) is designed with a drilling diameter which is, by a specified amount, larger than an external diameter of the pile tube ( 10 ), wherein an annular space ( 8 ) is formed between the borehole wall ( 5 ) and an external face of the pile tube ( 10 ), 
 in that the annular space ( 8 ) is separated from the interior of the pile tube ( 10 ) and 
 in that a supply means ( 30 ) for a hardenable medium is provided, wherein the supply means ( 30 ) leads into the annular space ( 8 ). 
 
     
     
         11 . Device according to  claim 10 , 
       characterized in that
 the drilling means ( 50 ) has a rotary drive for driving the drilling tool ( 20 ) in a rotating manner and 
 in that the rotary drive ( 54 ) is designed for introduction into the pile tube ( 10 ) and for being secured in the pile tube ( 10 ). 
 
     
     
         12 . Device according to  claim 11 , 
       characterized in that
 the drilling tool ( 20 ) is driven in a rotating manner via a drill rod ( 26 ) by the rotary drive ( 54 ) and 
 in that between the drilling tool ( 20 ) and the drill rod ( 26 ) a mixing means ( 40 ) is provided for crushing and/or mixing the ground material removed by the drilling tool ( 20 ) with a supplied fluid, in particular water.