Method for setting anchoring bolts in mines

Abstract

A method for installing a roof bolt in a mine, which method comprises: (i) drilling a hole in the roof of a mine; (ii) inserting a resin cartridge having a skin into the hole; (iii) inserting a bolt into the hole and which comprises employing in the hole a tool having one or more sharp elements and wherein the insertion of the bolt causes the tool to puncture the cartridge and prevent the skin from expanding against the wall of the hole.

1 . A method for installing a roof bolt in a mine which method comprises (i) drilling a hole in the roof of a mine 
 (ii) inserting a resin cartridge having a skin into the hole    (iii) inserting a bolt into the hole and which comprises employing in the hole a tool s having one or more sharp elements and wherein the insertion of the bolt causes the tool to puncture the cartridge and prevent the skin from expanding against the wall of the hole.    
     
     
         2 . A method as claimed in  claim 1  which comprises inserting the tool into the bore hole prior to the cartridge.  
     
     
         3 . A method as claimed in  claim 1  which comprises attaching the tool to the leading end of the cartridge prior to insertion in the hole so that the sharp elements point towards the cartridge.  
     
     
         4 . A method as claimed in  claim 1  which comprises attaching the tool to the tip of the bolt so that the sharp elements point towards the cartridge.  
     
     
         5 . An assembly for use in roof bolting said assembly comprising: 
 a cartridge and attached to one end thereof a tool having a sharp element which on the application of pressure in the bore hole is capable of puncturing the skin of the cartridge and depressurising the cartridge.    
     
     
         6 . An assembly as claimed in  claim 5  wherein the tool is attached to the clip of the cartridge.  
     
     
         7 . An assembly as claimed in  claim 5  or  6  wherein the sharp element comprises a plurality of teeth arranged so that when the assembly is inserted into a bore hole the teeth project towards the cartridge.  
     
     
         8 . A tool for use with a cartridge to puncture the cartridge said tool comprising: 
 a base of suitable size and cross section to be inserted in a bore hole and, extending from the base one or more sharp elements disposed so that when the tool is located in a bore hole with the base towards the bottom of the hole, the element projects towards the mouth of the hole.