Resin-anchored bolt with indentations

Abstract

A strata support system that provides support and balance to a rock mass and reacts to movement of the rock mass. The strata support system includes a borehole that is drilled into a surface of the rock mass. A resin is disposed in the borehole to secure a cable within the borehole. An anchor cable bolt assembly having a plurality of strands that are twisted together to form the cable is inserted into the borehole. At least one of the plurality of strands includes an interrupted outer surface that is defined by a plurality of spaced indentations. The plurality of spaced indentations are formed along the length of the strand and provide for a plurality of surface contours to enhance engagement of the anchor cable bolt with the resin.

1 . An anchor cable bolt assembly for providing support and balance to a rock mass and reacting to movement of the rock mass comprising:
 a plurality of strands twisted together to faun a cable, at least one of said plurality of strands having an interrupted outer surface defined by a plurality of spaced indentations formed along a length of said at least one strand, and wherein said plurality of spaced indentations provide for a plurality of surface contours for engagement with a resin.   
     
     
         2 . The anchor cable bolt assembly as set forth in claim l further including a fixture secured to an end of said cable for tensioning said cable relative to the rock mass. 
     
     
         3 . The anchor cable bolt assembly as set forth in  claim 2  further including a plate for placement between the rock mass and said fixture for tensioning said cable relative to the rock mass, said plate defining a plate opening for the passage of said cable through said plate. 
     
     
         4 . The anchor cable bolt assembly as set forth in  claim 2  wherein said fixture includes a wedge portion and a corresponding head portion, wherein said wedge portion engages said cable and secures said cable within said head portion as wedge portion engages said corresponding head portion for tensioning said cable. 
     
     
         5 . The anchor cable bolt assembly as set forth in  claim 4  wherein said head portion includes an internal bore that is tapered, and said wedge portion includes an outer surface that is tapered and complementary to said internal bore for being received in said internal bore of said head portion for tensioning said cable relative to the rock mass. 
     
     
         6 . The anchor cable assembly as set forth in  claim 4  wherein said head portion includes a hexagonal shaped outer surface for receiving a driving mechanism to rotate said head portion and tension said cable. 
     
     
         7 . The anchor cable assembly as set forth in  claim 4  wherein said wedge portion includes a plurality of wedges disposed about said cable for engagement with said cable. 
     
     
         8 . The anchor cable bolt assembly as set forth in  claim 7  wherein at least one of said wedges includes an inner surface having a plurality of serrations for securing said at least one wedge to said cable. 
     
     
         9 . The anchor cable bolt assembly as set forth in  claim 1  wherein said plurality of strands include a longitudinally extending center strand and a plurality of peripheral strands spirally wrapped around said center strand. 
     
     
         10 . The anchor cable bolt assembly as set forth in  claim 9  wherein each of said plurality of peripheral strands includes an interrupted outer surface defined by said plurality of spaced indentations formed along the length of each of said plurality of peripheral strands. 
     
     
         11 . The anchor cable bolt assembly as set forth in  claim 1  wherein each of said plurality of strands are coated. 
     
     
         12 . The anchor cable bolt assembly as set forth in  claim 1  wherein each of said plurality of strands are uncoated. 
     
     
         13 . A strata support system for providing support and balance to a rock mass and reacting to movement of the rock mass comprising:
 a borehole having a bore diameter and being drilled into a rock mass surface;   a plurality of strands, with each of said plurality of strands having a length and being twisted together to form a cable having a cable diameter and capable of being inserted into said borehole; and   a resin disposed in said borehole for securing said cable within said borehole;   wherein at least one of said plurality of strands includes an interrupted outer surface defined by a plurality of spaced indentations formed along the length of said at least one strand for providing a plurality of surface contours to engage with said resin.   
     
     
         14 . The strata support system as set forth in  claim 13  further including a fixture secured to an end of said cable for tensioning said cable relative to said rock mass. 
     
     
         15 . The strata support system as set forth in  claim 14  further including a plate for placement between said rock mass and said fixture to tension said cable relative to said rock mass, said plate defining a plate opening for the passage of said cable through said plate. 
     
     
         16 . The strata support system as set forth in  claim 14  wherein said fixture includes a wedge portion and a corresponding head portion, wherein said wedge portion engages said cable and secures said cable within said head portion as wedge portion engages said corresponding head portion for tensioning said cable. 
     
     
         17 . The strata support system as set forth in  claim 16  wherein said head portion includes an internal bore is tapered, and said wedge portion includes an outer diameter that is tapered and complementary to said internal bore for being received in said internal bore of said head portion for tensioning said cable. 
     
     
         18 . The strata support system as set forth in  claim 16  wherein said head portion includes a hexagonal shaped outer surface for receiving a driving mechanism to rotate said head portion and tension said cable. 
     
     
         19 . The strata support system as set forth in  claim 16  wherein said wedge portion includes a plurality of wedges disposed about said cable for engagement with said cable. 
     
     
         20 . The strata support system as set forth in  claim 19  wherein at least one of said wedges includes an inner surface having a plurality of serrations for securing said at least one wedge to said cable. 
     
     
         21 . The strata support system as set forth in  claim 13  wherein said plurality of strands include a longitudinally extending center strand and a plurality of peripheral strands spirally wrapped around said center strand. 
     
     
         22 . The anchor cable bolt assembly as set forth in  claim 21  wherein each of said plurality of peripheral strands includes an interrupted outer surface defined by said plurality of spaced indentations formed along the length of each of said plurality of peripheral strands. 
     
     
         23 . The strata support system as set forth in  claim 13  wherein said cable diameter is less than said bore diameter. 
     
     
         24 . The strata support system as set forth in  claim 23  wherein said borehole is defined by a wall portion within said rock mass, and further includes an annulus defined between said cable and said wall portion of said borehole for the flow of said resin in said annulus. 
     
     
         25 . A method of forming a strata support system for providing support and balance to a rock mass and reacting to movement of the rock mass, comprising the steps of:
 forming an interrupted outer surface on at least one of a plurality of strands;   twisting together the plurality of strands to form a cable;   drilling a borehole into a surface of a rock mass for receiving the cable;   disposing a resin in the borehole for securing the cable within the borehole; and   inserting the cable into the borehole;   wherein the plurality of indentations provide for a plurality of surface contours for engagement with the resin.   
     
     
         26 . The method of forming the strata support system as set forth in  claim 25  wherein the forming step is further defined as disposing a plurality of spaced indentations along a length of the at least one strand. 
     
     
         27 . The method of forming the strata support system as set forth in  claim 25  wherein the forming step is further defined as passing the at least one strand through an indenting station to dispose a plurality of spaced indentations along a length of the at least one strand. 
     
     
         28 . The method of forming the strata support system as set forth in  claim 25  further including the step of tensioning the cable relative to the rock mass. 
     
     
         29 . The method of forming the strata support system as set forth in  claim 25  wherein the forming step is further defined as forming an interrupted outer surface on a plurality of strands.