Generally, the hanging piece is for the line operator to make a hole directly in the rock wall with a drill, and then knock the hanging piece in, and put on the nut to finish it.
Surrounding rock bolt support through internal bolt changing the mechanical State of the rock itself
Q235 steel used for bolt, which is round. For light anchor bolts, and depth is generally 25 times times the diameter
Tensile capacity of anchor bolts is tensile capacity of the bar itself
People familiar with nuts know that many types of nuts, such as square nuts, round nuts, ring nuts, butterfly nuts
according to standard DIN580, materials for the lifting point only in the vertical direction of C15 ring or within the toroidal surface is less than 45 ° Angle to the vertical direction load