Drilling arrangements

Abstract

There is disclosed a device for boring holes in a ground surface comprising: a core barrel having a barrel top and an open barrel bottom, the barrel top having a shaft mounted thereto for engaging with a rotary power source for rotating the core barrel; at least one cutting member mounted to the core barrel at the open barrel bottom; and a pressurised fluid source in fluid communication with the shaft for delivering a supply of pressurised fluid to the shaft; wherein the at least one cutting member is configured such that when it is mounted to the core barrel at the open barrel bottom, the pressurised fluid causes the at least one cutting member to perform a cutting motion to remove the ground surface.

1 . A device for boring holes in a ground surface, the device comprising:
 a core barrel having a barrel top and an open barrel bottom, the barrel top having a shaft mounted thereto for engaging with a rotary power source for rotating the core barrel;   at least one cutting member mounted to the core barrel at the open barrel bottom; and   a pressurised fluid source in fluid communication with the shaft for delivering a supply of pressurised fluid to the shaft,   wherein the at least one cutting member is configured such that when the at least one cutting member is mounted to the core barrel at the open barrel bottom, the pressurised fluid causes the at least one cutting member to perform a cutting motion to remove the ground surface.   
     
     
         2 . The device according to  claim 1 , wherein the at least one cutting member is a substantially circular body mounted to engage with the open barrel bottom so as to extend across the open barrel bottom. 
     
     
         3 . The device according to  claim 2 , wherein the substantially circular body has a plurality of cutting teeth mounted about a periphery thereof. 
     
     
         4 . The device according to  claim 3 , wherein the plurality of cutting teeth are equispaced about the periphery of the substantially circular body and comprise multiple tooth members. 
     
     
         5 . The device according to  claim 4 , wherein the multiple tooth members extend angularly across the periphery of the substantially circular body. 
     
     
         6 . The device according to  claim 1 , wherein the substantially circular body is rotated under action of the pressurised fluid. 
     
     
         7 . A device for boring holes in a ground surface, the device comprising:
 an auger having a pair of helical flights or removing cut material;   a central recess extending centrally with respect to the pair of helical flights;   a pressurised fluid source in fluid communication with the central recess shaft for delivering a supply of pressurised fluid thereto; and   a cutting member mounted to the a base of the auger,   wherein the at least one cutting member is configured such that when the at least one cutting member is mounted to the base of the auger, the pressurised fluid causes the at least one cutting member to perform a cutting action to remove the ground surface.   
     
     
         8 . The device according to  claim 7 , wherein the cutting member comprises a plurality of hammer pistons that project outwards with respect to the cutting member under action of the pressurised fluid to impact the ground surface to remove material therefrom. 
     
     
         9 . The device according to  claim 8 , wherein the hammer pistons have cutting teeth formed thereon for impacting the ground surface. 
     
     
         10 . The device according to  claim 8 , wherein the cutting member has an internal thread that engages with an external thread provided on the base of the auger to facilitate mounting of the cutting member to the auger.