After setting of the resin the bolt is rotated in a second sense so that the bolt penetrates into {HEAD ~ the anchor} to tension {TAIL ~ the bolt} 
to tension
After setting of the resin the bolt is rotated in a second sense so that the bolt penetrates into { HEAD ~ the anchor } to tension { TAIL ~ the bolt }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL