Working machine and method for working the ground

Abstract

The invention relates to a working machine and a method for working the ground with the working machine, having a mast, along which, by means of a positioning means, a power rotary head is moved vertically, by which a telescopic Kelly rod having at least two Kelly bars is displaced and guided, wherein, for the purpose of torque transmission, the Kelly bars are provided on their external and/or internal sides with axially running drive keys as well as locking recesses on the drive keys and/or axial latch elements which are moved into the locking recesses for axially locking the Kelly bars or moved out of the locking recesses for unlocking. According to the invention provision is made in that by means of a control a locking state of the Kelly bars is checked automatically, wherein by the control the positioning means of the power rotary head and/or the main rope winch are actuated so that the Kelly bars are moved axially relative to each other, in that by means of a detection means a movement distance of the Kelly bars with respect to each other and/or an axial force during movement of the Kelly bars are axially detected, and in that depending on the detected movement distance and/or the detected axial force a locking state of the Kelly bars is ascertained by the control.

1 . Working machine, in particular construction machine, having a mast, along which, by means of a positioning means, a power rotary head is vertically movable, by which a telescopic Kelly rod having at least two Kelly bars is guided in a displaceable manner, wherein an outer Kelly bar designed for being supported on the power rotary head and an inner Kelly bar are provided which comprises a rope suspension for a rope, by which the inner Kelly bar is vertically movable by means of a main rope winch, wherein, for the purpose of torque transmission, the Kelly bars are provided on their external and/or internal sides with axially running drive keys as well as locking recesses on the drive keys and/or axial latch elements which can be moved into the locking recesses for axially locking the Kelly bars or moved out of the locking recesses for unlocking,
 characterized in that 
 a control is provided which is designed for automatically checking a correct locking state of the Kelly bars, irrespective of whether a locking process is carried out, 
 wherein by the control the positioning means of the power rotary head and/or the main rope winch can be actuated so that the Kelly bars are moved axially relative to each other, 
 in that at least one detection means is provided, with which a movement distance of the Kelly bars with respect to each other and/or an axial force during movement of the Kelly bars can be detected, and 
 in that depending on the detected movement distance and/or the detected axial force the control is designed to ascertain the correct locking state of the Kelly bars. 
 
     
     
         2 . Working machine according to  claim 1 ,
 characterized in that   in the control a limit value for a maximum movement distance and/or a limit value for a minimum axial pressure are stored and   in that in order to determine the correct locking state the detected movement distance can be compared with the maximum movement distance or the detected axial pressure can be compared with the minimum axial pressure.   
     
     
         3 . Working machine according to  claim 1 ,
 characterized in that   the Kelly rod has one or several intermediate Kelly bars which are arranged between the outer Kelly bar and the inner Kelly bar.   
     
     
         4 . Working machine according to  claim 1 ,
 characterized in that   on a lower end of the inner Kelly bar a ground working tool, in particular a drilling bucket or an auger, is mounted in a releasable manner.   
     
     
         5 . Working machine according to  claims 1 ,
 characterized in that   during movement of the Kelly bars the power rotary head can be actuated by the control, wherein a predetermined torque can be exerted.   
     
     
         6 . Working machine according to  claim 1 ,
 characterized in that   in order to detect the axial force a pressure increase in a hydraulic drive system can be detected.   
     
     
         7 . Working machine according to  claim 1 ,
 characterized in that   at least one input and/or determining means is provided, with which a type and/or size of the Kelly rod, a position of the positioning means for the power rotary head and/or a position of the rope can be input or determined.   
     
     
         8 . Working machine according to  claim 7 ,
 characterized in that   when detecting the correct locking state the position of the positioning means and/or a position of the rope can be saved in the control means.   
     
     
         9 . Method for working the ground with a working machine, in particular according to  claim 1 , having a mast, along which, by means of a positioning means, a power rotary head is moved vertically, by which a telescopic Kelly rod having at least two Kelly bars is displaced and guided, wherein an outer Kelly bar that is supported on the power rotary head and an inner Kelly bar are provided that is suspended on a rope, by which the inner Kelly bar is moved vertically by means of a main rope winch, wherein, for the purpose of torque transmission, the Kelly bars are provided on their external and/or internal sides with axially running drive keys as well as locking recesses on the drive keys and/or axial latch elements which are moved into the locking recesses for axially locking the Kelly bars or moved out of the locking recesses for unlocking,
 characterized in that   by means of a control a correct locking state of the Kelly bars is checked automatically, irrespective of whether a locking process is carried out,   wherein by the control the positioning means of the power rotary head and/or the main rope winch are actuated so that the Kelly bars are moved axially relative to each other,   in that by means of at least one detection means a movement distance of the Kelly bars with respect to each other and/or an axial force during movement of the Kelly bars are detected, and   in that depending on the detected movement distance and/or the detected axial force the correct locking state of the Kelly bars is ascertained by the control.   
     
     
         10 . Method according to  claim 9 ,
 characterized in that   for the purpose of checking, a ground working tool on the Kelly rod is placed onto the ground.   
     
     
         11 . Method according to  claim 9 ,
 characterized in that   a borehole is produced in the ground.   
     
     
         12 . Method according to  claim 11 ,
 characterized in that   the borehole is filled to form a foundation element.   
     
     
         13 . Method according to  claim 9 ,
 characterized in that   by the control an automatic locking process is carried out if no correct locking state has been ascertained.