Rock bolt
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[0026]FIG. 1 shows a rock bolt 1 according to the invention intended to be embedded in a borehole 2 in rock. The rock bolt 1 comprises an extended external tubular part 3 and an internal extended energy-absorbing part 4. In one preferred embodiment, the external part 3 has been given a length that is somewhat less than the length of the energy-absorbing part 4. The external tubular part 3 has a first end 5 and a second end 6, and a magnitude that allows the energy-absorbing part 4 to be surrounded by the external part 3. It is an advantage if the external part 3 has circular cross-section in the form of a circularly symmetrical metal tube, but it should be realised that also other forms and materials are possible. Square, elliptical or rectangular tubes, of metal, plastic or composite material can, for example, be used. Also other forms of the external tubular part 3 can be used.
[0027]The jacket 7 of the external tubular part 3 is, as is shown in FIGS. 6a-6c, arranged with a frictio...
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