Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1998-10-19
1999-12-07
Bagnell, David
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
4052591, 411 19, 411 32, 285390, 285901, E21D 2000, F16B 1304
Patent
active
05997219&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a tubeformed rock bolt. More specifically the invention concerns a tubeformed rock bolt which is formed for being joined to arbitrary length.
In a previously known rock bolt of the above mentioned kind, see U.S. Pat. No. 4,509,889, one can achieve a long rock bolt through entering a rock bolt into a bore hole and expanding it. Then a further bolt is entered on a tube extending from the inner rock bolt and is expanded so that it is fixed on the extending tube. A drawback when setting a long rock bolt comprising several short rock bolts is that one needs a long tool which normally must be bendable in order to set the rock bolt which is to be innermost in the bore hble. Another drawback is that the rock bolt at the joints becomes substatially weaker since the connection is obtained through friction. This force becomes small because the extending tube has small diameter and thus a small outer surface.
SUMMARY OF THE INVENTION
The present invention, which is defined in the subsequent claim, aims at achieving a rock bolt which can easily be joined to arbitrary length and which has perfect strength along the whole length after assembly.
BRIEF DESCRIPTION OF THE DRAWINGS
An embodiment of the invention is described below with reference to the accompanying drawings in which FIG. 1 schematically shows setting of a rock bolt.
FIG. 2 shows a section through one of the ends of a rock bolt according to the invention.
FIG. 3 shows a section through the other end of the rock bolt according to the invention.
FIG. 4 shows a section according to 4--4 in FIG. 2.
FIG. 5 shows a section according to 5--5 in FIG. 2.
FIG. 6 shows a section according to 6--6 in FIG. 3.
FIG. 7 shows a section according to 7--7 in FIG. 3.
FIG. 8 shows two bolt ends according to FIG. 2 and FIG. 3 screwed together.
FIG. 9 shows on a larger scale a detail from FIG. 8.
FIG. 10 shows the upper end of a top bolt for cooperation with a rock bolt according to the invention.
FIG. 11 shows a lower end of a rock bolt for cooperation with a rock bolt according to the invention.
FIG. 12 shows an end sleeve which can be used instead of the top bolt according to FIG. 10.
DESCRIPTION OF THE BEST MODES FOR CARRYING OUT THE INVENTION
In FIG. 1 is shown schematically the setting of a rock bolt 10 which comprises a number of rock bolts connected with one another. The rock bolt, which is described more in detail below, is set by expanding the rock bolt against the bore hole wall 11 by supplying high pressure liquid, preferably water, from a high pressure pump 39 via a valve 42, a tube 59, a hose 41 and a chuck 21 to a room in the rock bolt. The chuck can be made as described in U.S. Pat. No. 4,423,986. In FIGS. 2 and 3 two different ends of a rock bolt 10 according to the invention are shown. The bolt ends 14,24 which are shown in these figures can represent either two ends of the same rock bolt or two ends of two different bolts which are to be connected with one another. The rock bolt comprises an elongated tube 12 which along the major part of its length is provided with a depressed part 13. A sleeve 22 is by means of welding secured to one end of the tube 12. An end piece 14 is welded to the sleeve 22. A sleeve 23 is welded to the other end of the tube 12. An end piece 24 is welded to the sleeve 23. Both branches 25,26 of the depressed part 13 are at both ends of the tube 12 pressed together and by means of welds 27 sealingly connected with one another. Through this the tube 12 defines a room 16 whose only connection with the surroundings is constituted by the channels 15 and 35 through the end pieces 14 and 24. The end piece 14 is provided with an internal thread 17 and the end piece 24 with an external thread 37 by means of which two rock bolts can be connected with one another. In the shown example the end piece 14 is provided with a raised periphery 19 about the channel 15. This raised periphery is intended for cooperation with a channel periphery 20 on the end piece 24. Through deformation of
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Krzysztalowicz Daniel
Ohlson Bo
Atlas Copco Rock Drill AB
Bagnell David
Lee Jong-Suk
Stone Mark P.
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