EP1027529B1 - Apparatus for bending and cutting cable in rock bolting equipment - Google Patents

Apparatus for bending and cutting cable in rock bolting equipment Download PDF

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Publication number
EP1027529B1
EP1027529B1 EP98921506A EP98921506A EP1027529B1 EP 1027529 B1 EP1027529 B1 EP 1027529B1 EP 98921506 A EP98921506 A EP 98921506A EP 98921506 A EP98921506 A EP 98921506A EP 1027529 B1 EP1027529 B1 EP 1027529B1
Authority
EP
European Patent Office
Prior art keywords
piston
bending
cutting
cable
pressure fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98921506A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1027529A1 (en
Inventor
Ossi Tienari
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sandvik Mining and Construction Oy
Original Assignee
Sandvik Tamrock Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sandvik Tamrock Oy filed Critical Sandvik Tamrock Oy
Publication of EP1027529A1 publication Critical patent/EP1027529A1/en
Application granted granted Critical
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Anticipated expiration legal-status Critical
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00—Setting anchoring-bolts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F11/00—Cutting wire
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/006—Anchoring-bolts made of cables or wires

Definitions

  • the invention relates to an apparatus for bending a cable to make it stay in the hole after insertion therein, by means of the friction achieved by the bending and cutting the cable in a rock bolting equipment
  • a rock bolting equipment comprising a frame with a conduit through which the cable is adapted to pass when it is fed into the drilled hole; a cutting piston for cutting the cable adapted to move in the transverse direction of the cable; and pressure fluid spaces for moving the cutting piston in directions opposite to its travel direction; a bending piston arranged to move in the transverse direction of the cable to bend the cable during its feeding into the drilled hole; and pressure fluid spaces for moving the bending piston in directions opposite to the travel direction; in the longitudinal direction of the cable, at the opposite side of said conduit, both sides of the bending piston comprise successive counter surfaces against which the cable is pressed when being pressed by means of the bending piston so as to provide the cable with a bend on both sides of the bending piston between the counter surfaces and the surface of the bending piston pushing the cable.
  • the rock surface In tunnel and mining jobs, the rock surface occasionally has to be reinforced to avoid collapsing. This is carried out by bolting the rock, a hole being first drilled into the rock, and a rock bolt then being fed into the hole and fastened by grouting with concrete or resin.
  • a suitably shaped steel cable what is known as a cable bolt, is employed.
  • Such a steel cable is pushed into the hole either by hand or nowadays by employing a separate cable feeding device.
  • a problem in using cable bolts is that cable is usually supplied in spools and has to be cut in a suitable length on site.
  • Finnish patent application 831,481 teaches a rock bolting equipment with a pressure medium cylinder-driven cutting device provided with a fixed counter piece and a moving pressure medium cylinder-driven blade, and used for cutting a bolt by pressing the blade against the counter piece until the bolt is cut.
  • Said publication further discloses a cable feeding device for bending a rigid bolt by pressing the feeding rollers of the feeding mechanism against one another to provide a bend in the bolt.
  • this solution is not usable for cable bolts since cable is flexible and consequently no permanent change in shape is formed therein.
  • the apparatus of the invention is characterized in that it comprises in the travel direction of the cutting piston, on the opposite side of said conduit, a counter blade, against which the cutting piston presses the cable at the cutting stage to cut it; and that the bending piston is provided with an opening parallel to said conduit, the opening being substantially concentric with said conduit when the bending piston is in its normal position.
  • the same apparatus provides separately usable cutting and bending pistons which can be used independently of one another to achieve the desired function.
  • Another essential idea of the invention is that it comprises a lead-through conduit through which the bolt cable is adapted to pass in such a way that during the entire feeding of the bolt the cable is located at the cutting piston and at the bending piston.
  • the apparatus of the invention with the cable located at the right position for both cutting and bending, the desired procedure can be carried out by merely coupling a sufficient pressure fluid pressure to act on the desired piston. It is a further advantage of the invention that in addition to cable handling being simple and easy, the apparatus is also small and easily installable into the desired place. It is still a further advantage of the invention that implemented in this manner, the feeding hose for grout, e.g. concrete, can be fed through the apparatus via the same controls, the bolting end of the rock bolting apparatus not having to be moved from its position or turned to different positions during different bolting stages, but once it has been positioned at a hole, the whole grouting process can be carried out in the same position.
  • the feeding hose for grout e.g. concrete
  • Figure 1a shows schematically an apparatus for bending a cable bolt and cutting it in the desired length in the normal position of the apparatus.
  • the apparatus comprises a frame 1 with a bending piston 2 and a cutting piston 3 moving therein.
  • the pistons 2 and 3 are disposed movably in succession in a transverse direction with respect to the cable.
  • a part 1a of the frame surrounding the bending piston 2 is provided with lead-through holes 6, through which the cable can be fed.
  • the bending piston 2 further comprises an opening 2a which, the bending piston being in its rest position, i.e.
  • a part 1b of the frame surrounding the cutting piston 3 comprises similar holes 7, which are in alignment with the holes 6 in such a way that, with the pistons in their normal position as shown in Figure 1a, an almost continuous conduit is provided through the entire apparatus, through which even the cable, or when required, a concrete hose, can be pushed at a given stage of the bolting.
  • the edge of the frame part 1b facing the bending piston 2 comprises a counter blade 8 with a sharp cutting edge in the travel direction of the cutting piston 3.
  • the end of the cutting piston 3, comprises a second cutting blade 3a, shaped such that, with the cutting piston 3 projecting upwards from the position shown in Figure 1a, it leads a cable 9 suitably against the counter blade 8 and, with the movement advancing in this way, causes the cable 9 to be cut.
  • Figure 1b shows schematically how a cable is bent by means of the bending piston 2.
  • the bending is complete, whereby the cable 9 passing through the openings of the apparatus is pressed by the bending piston 2 against bevelled counter surfaces 6a disposed at the upper edges of the openings 6 in the frame part 1a.
  • the cable 9 is bent against the bevelled edges of the opening 2a in the bending piston 2, resulting in a permanent bend in the cable 9 by means of sufficient pressing force.
  • the pressing is achieved by feeding into the cylinder space 4 of the bending piston 2 pressure liquid which forces the bending piston from the position shown in Figure 1a to the position shown in Figure 1b.
  • a shaft 4b is fixedly disposed in the cylinder space 4 with respect to the frame part 1a and extends inside the bending piston 2, a piston with a dedicated cylinder space inside the bending piston 2 being arranged inside the bending cylinder 2.
  • Pressure fluid can be fed into said cylinder space to push the bending piston 2 back downwards from the position shown in Figure 1b.
  • the cable 9 can be moved forwards, fed into a hole in the rock, and the bending of the cable 9 can be repeated at suitable intervals.
  • Figure 1c in turn shows a case where the bending piston 2 is in its normal position, corresponding to Figure 1a, and the cable 9 can pass freely through the holes 6 and the opening 2a.
  • pressure fluid has been fed into the cylinder space 5 of the cutting piston 3, into the space 5a between the piston part 3b of the cutting piston and the frame part 1b, and in the figure the pressure fluid has pushed the cutting piston 3 upwards with respect to the position shown in Figure 1a.
  • the second cutting blade 3a at the upper end of the cutting piston 3 has pushed the cable 9 against the counter blade 8 forcing it to be cut.
  • the cutting piston can be restored by supplying pressure fluid to the cylinder space part 5b above the piston part 3b in the figure, the pressure fluid moving the cutting piston 3 back to the position shown in Figure 1a.
  • Figures 2a to 2c in turn show another embodiment of the invention, resulting in a very compact structure requiring little space.
  • the bending piston 2 and the cutting piston 3 are arranged one within the other and move coaxially in their longitudinal direction.
  • the bending piston 2 is sleeve-like, its upper end being open in the middle and its lower end comprising a base 2b.
  • a fixed auxiliary piston 11 is further attached to the tubular frame 1 coaxially with the bending piston 2 and the cutting piston 3, an arm 11 a of the auxiliary piston passing through the bottom 2b of the bending piston 2, leaving a first pressure fluid space 12 between the auxiliary piston 11 and the bending piston 2. Furthermore, an arm 11b on the other side of the auxiliary piston 11 extends inside the cutting piston 3, leaving a second pressure fluid space 13 between the cutting piston 3 and the auxiliary piston 11, a pressure fluid conduit 13a passing from the second pressure fluid space through the auxiliary piston 11 and its arm 11a to the outside of the apparatus.
  • a third pressure fluid space 14 is further disposed between the bending piston 2 and the cutting piston 3.
  • the frame 1 has openings 6 and the bending piston 2 has corresponding openings 2c which, when the pistons are in the position shown in Figure 2a, form a continuous conduit through the apparatus for feeding a cable, or if desired, a concrete hose through the apparatus.
  • the figure shows the upper edges of the openings 6 acting as the counter surfaces 6a and, similarly, the lower edges of the openings 2c of the bending piston 2, the edges being bevelled to make the cable bend reliably and without damage in the manner described in Figure 2b.
  • FIG 2b shows schematically how a cable is bent.
  • pressure fluid has been led into the third cylinder space 14 between the bending piston 2 and the cutting piston 3 or the conduit leading thereto has been closed.
  • Pressure fluid is similarly supplied to the second pressure fluid space 13.
  • the pressure fluid is allowed to be discharged to the pressure fluid container in a manner known per se.
  • the bending piston 2 is moved back to the position shown in Figure 2a by feeding pressure fluid into the first pressure fluid space 12 and letting the pressure fluid be discharged from the third pressure fluid space 13 to the pressure fluid container in a manner known per se.
  • Figure 2c in turn shows how a cable is cut.
  • the first pressure fluid space is closed with no pressure fluid being led thereto or therefrom.
  • the second pressure fluid space 13 when being fed with pressure fluid, tends to push the cutting piston 3 into the position shown in Figure 2c.
  • the pressure fluid is discharged from the third pressure fluid space 14 to the pressure fluid container in a manner known per se.
  • the cutting piston 3 As the cutting piston 3 is pushed from the situation shown in Figure 2a upwards, it forces the cable 9 to be pressed between the cutting blade 3a and the counter blade 8, thus cutting the cable 9.
  • the cutting piston 3 can be restored to the position shown in Figure 2a by feeding pressure fluid into the third pressure liquid space 14 and by similarly letting it be discharged to the pressure fluid container from the second pressure fluid space 13.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Shearing Machines (AREA)
EP98921506A 1997-05-14 1998-05-11 Apparatus for bending and cutting cable in rock bolting equipment Expired - Lifetime EP1027529B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI972071A FI106645B (fi) 1997-05-14 1997-05-14 Laite vaijerin taivutusta ja katkaisua varten kallionpultituslaitteistossa
FI972071 1997-05-14
PCT/FI1998/000396 WO1998051904A1 (en) 1997-05-14 1998-05-11 Apparatus for bending and cutting cable in rock bolting equipment

Publications (2)

Publication Number Publication Date
EP1027529A1 EP1027529A1 (en) 2000-08-16
EP1027529B1 true EP1027529B1 (en) 2003-10-08

Family

ID=8548856

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98921506A Expired - Lifetime EP1027529B1 (en) 1997-05-14 1998-05-11 Apparatus for bending and cutting cable in rock bolting equipment

Country Status (7)

Country Link
EP (1) EP1027529B1 (fi)
AU (1) AU7433298A (fi)
CA (1) CA2289642C (fi)
DE (1) DE69818859D1 (fi)
FI (1) FI106645B (fi)
WO (1) WO1998051904A1 (fi)
ZA (1) ZA983950B (fi)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11213873B2 (en) 2019-06-21 2022-01-04 Fci Holdings Delaware, Inc. Mine bolt bending system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2009201533B2 (en) 2009-04-20 2015-02-19 Joy Global Underground Mining Llc Roof Bolting Cable Bolt Feeding Device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4079592A (en) * 1977-03-04 1978-03-21 The United States Of America As Represented By The Secretary Of The Interior Method of and apparatus for feeding and inserting bolts in a mine roof
FI67916C (fi) * 1982-08-03 1985-06-10 Tampella Oy Ab Anordning foer foerhandsfaestning av en staolvajerbult
US5419660A (en) * 1993-10-08 1995-05-30 Metal Marquis Inc. Bending and feeding apparatus for installing a cable into a preformed bore

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11213873B2 (en) 2019-06-21 2022-01-04 Fci Holdings Delaware, Inc. Mine bolt bending system

Also Published As

Publication number Publication date
FI972071A0 (fi) 1997-05-14
FI106645B (fi) 2001-03-15
CA2289642A1 (en) 1998-11-19
DE69818859D1 (de) 2003-11-13
AU7433298A (en) 1998-12-08
CA2289642C (en) 2007-05-08
EP1027529A1 (en) 2000-08-16
WO1998051904A1 (en) 1998-11-19
ZA983950B (en) 1998-11-13
FI972071A (fi) 1998-11-15

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