Abstract: When securing a rock bolt in a drilled hole in the rock the bolt having a conical end, is inserted to the desired depth in the hole. A gun, charged with a sleeve, is applied on the outer end of the rock bolt, and the bolt is centered in the gun barrel. The sleeve is shot into the hole at a high speed to be wedged in the gap between the conical end of the bolt and the wall of the hole.

Abstract: There is provided a joint between a pressure vessel lid and a pressure vessel. The vessel is intended for very high pressures and of the type comprising a thinwalled container which is supported by an external rigid support structure, such that the container provides the vessel tightness and the structure provides the vessel strength. The lid is clamped onto a container rim by means of screws via blocks. An annular shoulder is fixed to the support structure above the container rim. There is an axial play between the blocks and the shoulder. This play is adapted to be eliminated for a relatively low container pressurization at which the yield limit of the container material is reached. The screws merely have to provide the clamping force required to ensure the vessel tightness until the blocks abut the shoulder, whereafter a further container pressurization provides the necessary lid clamping force.