Method and device for releasing a block on a bore crown during a boring process

Abstract

The invention relates to a method and a device for releasing a block or blockage on a bore-crown or drill bit ( 1 ) during a boring process, especially percussion boring or rotary percussion boring or drilling, for boring holes in the ground or rock, whereby a borehole is formed by a bore-crown ( 1 ) mounted on a boring rod or a drill rod assembly ( 2 ) and connected thereto and acted upon by the boring rod to generate a rotational movement and optionally a percussive movement. According to the invention, when the bore-crown ( 1 ) is blocked, preventing the continuation of the boring process and especially another rotational movement of the bore-crown ( 1 ), the bore-crown ( 1 ) is subjected to a linear movement in the opposite direction to the boring direction by means of the boring rod ( 2 ), and to a rotational movement in a direction opposing the direction of the rotational displacement during the boring process by means of a corresponding connection ( 7, 9 ) between the end of the boring rod ( 2 ) facing the bore-crown ( 1 ), and the bore-crown ( 1 ), independently of a rotary drive for carrying out the boring process. As a result the borehole can be bored in a simple manner after releasing the block on the bore-crown ( 1 ).

1 - 12 . (canceled) 
   
   
       13 . A method for releasing a blockage of a drill bit during the drilling, particularly percussion or rotary percussion drilling, of holes in soil or rock material, wherein a borehole is formed by a drill bit mounted on a drill rod assembly and connected thereto and acted upon by the drill rod assembly to perform a rotational movement and optionally a percussive movement, wherein, at a blockage of the drill bit preventing the continuation of a drilling procedure and, in particular, any further rotational movement of the drill bit, the drill bit, via the drill rod assembly, is subjected to a linear movement opposite the drilling direction and, in addition, a rotational movement in a direction opposite the direction of the rotational movement during the drilling procedure via an appropriate connection between the end of the drill rod assembly facing the drill bit and the drill bit and independently of a rotary drive for carrying out the drilling procedure. 
   
   
       14 . The method according to  claim 13 , wherein the connection between the end of the drill rod assembly facing the drill bit and the drill bit is realized via an adapter comprising at least one helicoidal or spiral-shaped depression or flattening or elevation, and a complementary profiling provided on the drill bit, said helicoidal or spiral-shaped depression or flattening or elevation comprising a large inclination or pitch relative to the longitudinal axis of the drill rod assembly. 
   
   
       15 . The method according to  claim 14 , wherein a plurality of helicoidal or spiral-shaped profilings are provided, which are uniformly arranged about the periphery of the end facing the drill bit. 
   
   
       16 . The method according to  claim 13 , wherein a merely pointwise engagement on several sites in the region of the profilings between the drill rod assembly or adapter and the drill bit is provided. 
   
   
       17 . A device for releasing a blockage of a drill bit during the drilling, particularly percussion or rotary percussion drilling, of holes in soil or rock material, wherein a drill bit is mounted on a drill rod assembly and acted upon by the drill rod assembly to perform a rotational movement and optionally a percussive movement for the formation of a borehole, wherein at least one spiral-shaped or helicoidal connection is provided between the end of the drill rod assembly facing the drill bit and the drill bit, which, at a blockage of the drill bit upon retraction of the drill rod assembly opposite the drilling direction, in addition to a linear movement opposite the drilling direction, acts upon the drill bit to perform a rotational movement in a direction opposite the direction of rotation during the drilling procedure independently of a rotary drive for carrying out the drilling procedure. 
   
   
       18 . The device according to  claim 17 , wherein the at least one spiral-shaped or helicoidal connection is comprised of a depression or elevation or flattening provided on an adapter arranged between the drill rod assembly and the drill bit, and a complementary profiling provided on the drill bit. 
   
   
       19 . The device according to  claim 17 , wherein a plurality of helicoidal or spiral-shaped profilings are provided between the drill rod assembly or adapter, respectively, and the drill bit, which are each equidistantly arranged. 
   
   
       20 . The device according to  claim 17 , wherein the at least one helicoidal or spiral-shaped connection or profiling comprises a large pitch or inclination relative to the longitudinal axis of the drill rod assembly. 
   
   
       21 . The device according to  claim 17 , wherein a plurality of substantially point-shaped or semispherical elevations are provided in a pocket hole of the drill bit for cooperation with the spiral-shaped or helicoidal depression(s) or recess(es) on the end of the adapter facing the drill bit. 
   
   
       22 . The device according to  claim 17 , wherein a plurality of adjacent, spiral-shaped flattenings are provided on the outer periphery of the adapter or drill rod assembly, respectively, and complementary flattenings are provided in a pocket hole of the drill bit, said flattenings having polygonal, for instance hexagonal, contours in terms of cross section. 
   
   
       23 . The device according to  claim 17 , wherein, in the interior of the drill rod assembly and/or the adapter, a passage channel for supplying a cooling or flushing fluid to the outlet channels or holes of the drill bit and/or the adapter is provided, which discharge on the working face of the drill bit and/or the peripheral surface of the adapter. 
   
   
       24 . The device according to  claim 17 , wherein, in a manner known per se, depressions or recesses and/or passage openings are provided on the outer periphery of the drill bit for removing excavated material through an annular space between the outer periphery of the drill rod assembly and the inner wall of the produced borehole.