S e c t i on3 - P a ge 1 1 May 2013 The W edge Anchorage of the Cable Bolt The anchorage of most cable bolts consists of a wedge barr el and a 2- or 3-part wedge. The wedge segments grip the cable by means of tooth shaped thr eads which ar e for ced into the surface of the cable wir es. W ar ning: If friction incr eases (due to corr osion), a lar ger F will r educe the clamping for ce. As V incr eases all other for ces can only incr ease if the wedge can seat deeper into the barr el. If the wedge is r estrained to do so (i.e. by corr osion or dirt-accumulation), the clamping for ce can not incr ease with the pulling for ce causing slippage when the load on the cable bolt gradually incr eases during service life. T o avoid slippages during use, it is important that the cable bolt is fully str essed at time of installation to a for ce equal to 0.5 Fu. (i.e. 50 of the capacity of the cable) The clamping for ce W is highly dependent on the friction between wedge and wedge hole. For normal friction conditions, the clamping for ce W is mor e than 4 times the cable pulling for ce V and it adjusts with the pulling for ce V . When a wedge is pr operly seated, radial cracks may develop indicating adequate seating. The wedge can be supplied with a rubber O-ring or a metal spring ring holding the wedge segments together . www .dsiundergr ound.com