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WO1992009789A1 - Boulon de roche - Google Patents

Boulon de roche Download PDF

Info

Publication number
WO1992009789A1
WO1992009789A1 PCT/FI1991/000356 FI9100356W WO9209789A1 WO 1992009789 A1 WO1992009789 A1 WO 1992009789A1 FI 9100356 W FI9100356 W FI 9100356W WO 9209789 A1 WO9209789 A1 WO 9209789A1
Authority
WO
WIPO (PCT)
Prior art keywords
bolt
bolt portion
threads
rock
portions
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.)
Ceased
Application number
PCT/FI1991/000356
Other languages
English (en)
Inventor
Pertti Saarelainen
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.)
Tamrock Oy
Original Assignee
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 Tamrock Oy filed Critical Tamrock Oy
Publication of WO1992009789A1 publication Critical patent/WO1992009789A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/042—Threaded
    • E21B17/0426—Threaded with a threaded cylindrical portion, e.g. for percussion rods
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/22—Rods or pipes with helical structure
    • 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
    • E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
    • 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
    • E21D21/0053—Anchoring-bolts in the form of lost drilling rods

Definitions

  • This invention relates to a rock bolt compris- ing bolt portions interconnectable by a thread to form an extension of each other.
  • the bolting On supporting rock in cramped places where the length of the bolt, for instance, is greater than the free space of the tunnel in the direction of the hole, the bolting often has to be carried out in dif- ficult ways.
  • the bolts used in such cases are either wire bolts fed into the hole and cut into a suitable length, or a bolt iron on a reel is straightened and fed into the hole and then cut into a suitable length.
  • the bolting requires that a hole should first be drilled by a rock drilling equipment, whereafter the rock drilling equipment is displaced aside for the time required for feeding and supporting the bolt. This makes the work slower and more difficult, and increases the risk of a danger situation as material may be loosened from the rock during the exchange of equipment.
  • extension rod bolts in which identical bolt portions are interconnected in a sequence by means of threads and pushed into the hole manually or by means of a bolt handling apparatus.
  • This kind of extension bolt structure is complicated and difficult to install manually; on the other hand, an expensive, compli ⁇ cated apparatus is required for installing it with the bolt handling apparatus, in addition to which the drilling equipment has to be displaced aside for the time required for installing the bolt.
  • the object of the present invention is to provide a rock bolt which is easy to install and easy to handle both before and during installation.
  • the rock bolt according to the invention is characterized in that it comprises a tubular outer bolt portion and an inner bolt portion capable of being pushed into the outer bolt portion; that one bolt portion is pro- vided at its both ends with threads on the surface facing the other bolt portion, said threads project ⁇ ing from said surface towards the other bolt portion; that one bolt portion is provided at its one end with at least one thread so that the bolt portions are interconnectable axially immovably with respect to each other by means of the threads and when the inner bolt portion is substantially withdrawn from within the outer bolt portion.
  • the rock bolt comprises two extension portions which can be placed one within the other, so that the rock bolt can first be pushed into the drill hole with its por ⁇ tions within each other, whereafter the inner bolt portion can be withdrawn from within the outer bolt portion and attached to it by a thread to achieve a continuous, steady rock bolt, which can be pushed in place in the hole and tightened after the hardening of the grout so as to support the rock.
  • the rock bolt according to the invention has the advantage that a short rock bolt can be used in low spaces at the initial stage of the installation, and after the first bolt portion has been inserted into the hole, the bolt is extended so that a bolt structure of suf ⁇ ficient length for supporting the rock is achieved while the handling of the bolt both before and during installation is easy and simple.
  • Figure 1 is a schematic sectional view of a rock bolt according to the invention with the bolt portions within each other;
  • Figure 2 is a schematic view of the rock bolt according to the invention when extended into full length; and Figure 3 is a schematic sectional view of another embodiment of the rock bolt according to the invention.
  • Figure 1 shows a rock bolt 1 comprising a sleeve-like outer bolt portion 2 and a rod-like inner bolt portion 3 within the outer portion.
  • the forward end of the outer bolt portion is provided with an internal thread 4, and the same end of the inner bolt portion is correspondingly provided with a thread 5 by means of which the inner portion of the bolt can be screwed into the outer portion so that they are axially immovable.
  • its inner bolt portion comprises a support flange 6 which is tightened against the end of the outer sleeve-like bolt portion when the rock bolt portions are screwed within each other. It thus locks the bolt portions 2 and 3 axially together, which also prevents their rotation with respect to each other in the possible direction of rotation of the bolt.
  • the inner portion of the rock bolt further comprises a tightening por- tion 8 provided with a thread 7 outward from the flange 6, so that a proper washer 10 intended for supporting the rock can be tightened against the sur ⁇ face of the rock by means of a nut 9 screwing onto the tightening portion 8.
  • the rear end of the outer portion 2 of the bolt is further provided with a thread 11, and the inner portion 3 of the bolt is further provided with another thread 12 at the back of the thread 5, that is, on the side of the washer 6.
  • the threads 4, 5, 11 and 12 on the respective bolt portion project from the surface towards the other bolt portion, that is, they are outside the surface away from the surface.
  • the thread 5 and the thread 12 of the inner bolt portion have reverse screw directions. This means that if the thread 5 is a right-hand thread, the thread 12 is a left-hand thread, and vice versa.
  • the threads 4 and 11 of the outer bolt portion 2 are of reverse screw direction so that when the thread 4 is a right-hand thread, the thread 11 is a left-hand thread, and vice versa.
  • the basic idea of the invention is that when the bolt portions 2 and 3 are within each other, they are screwed together so that the threads 4 and 5 are within each other and the washer 6 is pressed against the end of the outer bolt portion 2.
  • the bolt is thereby at shortest and it can be. installed in the hole even in low spaces.
  • the outer bolt portion 2 is gripped and the threads 4 and 5 are unscrewed by rotating the inner bolt portion 3 with respect to the outer bolt portion 2.
  • the inner bolt portion 3 is withdrawn and rotated in the opposite direction as compared with the opening of the threads 4 and 5, and so the inner bolt portion is tightened when the threads 11 and 12 screw onto each other and is finally locked in position when the thread 5 opposite in direction to the thread 12 reaches the edge of the thread 11.
  • the thread 5 acts as a locking member which locks the bolts with respect to rotation in the direction of rotation and simultaneously correspondingly axially with respect to each other.
  • the inner bolt portion 3 may comprise a separate conduit 13 extending through it, through which conduit grout can be introduced into the hole at a suitable stage when the bolt is being installed either when the entire bolt has been pushed into the hole or when the bolt has been pushed into the hole only partly and the bolt portions 2 and 3 are either within each other or withdrawn with respect to each other.
  • the forward end of the outer portion 2 of the bolt may be provided within the area of the thread 4 with an external thread 14, onto which a separate drill bit 15 can be screwed so that the bolt can be used both as a disposable drill rod and as a bolt, and a hole can be drilled by means of it in the rock before the grout is fed into the hole.
  • the bolt 1 may be positioned in the hole either manually or mechanically, whereby the bolt can be extended simply by using the well-known retaining means of a conventional drill centralizer for keeping the outer bolt portion 2 stationary when the inner bolt portion 3 is rotated. After the entire bolt has been pushed into the rock hole, the grout is allowed to harden, whereafter the washer 10 is tightened against the rock surface by means of the nut 9.
  • Figure 3 shows another embodiment of the rock bolt according to the invention, in which the threads are formed in a different way.
  • the threads of the outer bolt portion 2 are positioned at its both ends and both threads of the inner bolt portion 3 are positioned at the same end thereof, whereas in the case of Figure 3 both threads 4 and 11 of the first tubular bolt portion 2 are pro ⁇ vided at the same end thereof, i.e. at its rear end; correspondingly, the threads of the second i.e. inner bolt portion 3 are provided at both ends of the inner bolt portion.
  • this solution is similar to the bolt shown in Figure 1, but, with respect to the bolt shown in Figure 1, the screw directions of the threads are opposite as com ⁇ pared with the same direction of rotation.
  • a thread 11' of the bolt of Figure 3 also acts as a locking member when the inner bolt portion 3 out of the outer bolt portion 2 and the threads 5' and 4'. are screwed onto each other, so that the thread 5' finally reaches the thread 11' having opposite screw direction as compared to it at the end adjacent to it and is thus prevented from being screwed any further while the bolt portions 2 and 2 are locked to each other also in the axial direction.
  • the bolt of Figure 3 may further be pro ⁇ vided with an external thread 14 similar to the external thread of Figure 1 at its pull end for the attachment of a possible drill bit 15 when the bolt is to be used as a disposable drill rod.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Structural Engineering (AREA)
  • Earth Drilling (AREA)

Abstract

Boulon de roche (1) comportant une partie externe (2) en forme de manchon et une partie interne (3) aptes à s'emboîter l'une dans l'autre. Les extrémités avant et arrière de ladite partie externe sont dotées de filetages internes (5, 11) à sens opposés. L'extrémité avant de ladite partie interne (3) est dotée de filetages voisins (5, 12) dont les sens sont opposés l'un à l'autre mais égaux au sens du filetage (4, 11) situé du même côté sur ladite partie externe. On peut installer le boulon dans un trou d'abord en l'introduisant dans le trou pendant que lesdites parties (2, 3) sont emboîtées l'une dans l'autre, puis en dévissant ladite partie interne de ladite partie externe, en la retirant de cette dernière et en la fixant à l'extrémité arrière de la partie externe à l'aide des filetages (12, 11).
PCT/FI1991/000356 1990-11-28 1991-11-27 Boulon de roche Ceased WO1992009789A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI905862A FI905862L (fi) 1990-11-28 1990-11-28 Bergbult.
FI905862 1990-11-28

Publications (1)

Publication Number Publication Date
WO1992009789A1 true WO1992009789A1 (fr) 1992-06-11

Family

ID=8531478

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1991/000356 Ceased WO1992009789A1 (fr) 1990-11-28 1991-11-27 Boulon de roche

Country Status (3)

Country Link
AU (1) AU8927691A (fr)
FI (1) FI905862L (fr)
WO (1) WO1992009789A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996023959A1 (fr) * 1995-02-01 1996-08-08 Reburg-Patentverwertungsgesellschaft Mbh Ancre d'injection
EP0843073A1 (fr) * 1996-11-13 1998-05-20 Gerhard Dr.-Ing. Sauer Procédé et dispositif pour la mise en place de boulons d'ancrage à injection
WO2003071098A1 (fr) * 2002-02-25 2003-08-28 Steffen, Robertson & Kirsten (South Africa) (Pty) Ltd And William David Ortlepp Boulon d'ancrage
WO2008128266A1 (fr) * 2007-04-19 2008-10-30 Techmo Entwicklungs- Und Vertriebs Gmbh Dispositif de création d'un trou de forage dans de la roche
DE102011076592A1 (de) * 2011-05-27 2012-11-29 Hilti Aktiengesellschaft Gesteinsanker

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1635289A (en) * 1924-05-15 1927-07-12 Dan J Scott Collapsible drill pipe
US4196781A (en) * 1978-08-09 1980-04-08 Cheek Alton E Telescoping joint
US4313695A (en) * 1980-01-07 1982-02-02 Ingersoll-Rand Company Earth structure stabilizing method, and a friction rock stabilizer and an axial extension therefor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1635289A (en) * 1924-05-15 1927-07-12 Dan J Scott Collapsible drill pipe
US4196781A (en) * 1978-08-09 1980-04-08 Cheek Alton E Telescoping joint
US4313695A (en) * 1980-01-07 1982-02-02 Ingersoll-Rand Company Earth structure stabilizing method, and a friction rock stabilizer and an axial extension therefor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996023959A1 (fr) * 1995-02-01 1996-08-08 Reburg-Patentverwertungsgesellschaft Mbh Ancre d'injection
EP0843073A1 (fr) * 1996-11-13 1998-05-20 Gerhard Dr.-Ing. Sauer Procédé et dispositif pour la mise en place de boulons d'ancrage à injection
WO2003071098A1 (fr) * 2002-02-25 2003-08-28 Steffen, Robertson & Kirsten (South Africa) (Pty) Ltd And William David Ortlepp Boulon d'ancrage
US7445406B2 (en) 2002-02-25 2008-11-04 Steffen, Robertson & Kirsten (South Africa) (Pty) Ltd. Rock bolt
WO2008128266A1 (fr) * 2007-04-19 2008-10-30 Techmo Entwicklungs- Und Vertriebs Gmbh Dispositif de création d'un trou de forage dans de la roche
DE102011076592A1 (de) * 2011-05-27 2012-11-29 Hilti Aktiengesellschaft Gesteinsanker

Also Published As

Publication number Publication date
FI905862A0 (fi) 1990-11-28
AU8927691A (en) 1992-06-25
FI905862A7 (fi) 1992-05-29
FI905862L (fi) 1992-05-29

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