WO1999050531A1 - Stabilisateur de roches a friction - Google Patents

Stabilisateur de roches a friction Download PDF

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Publication number
WO1999050531A1
WO1999050531A1 PCT/ZA1999/000009 ZA9900009W WO9950531A1 WO 1999050531 A1 WO1999050531 A1 WO 1999050531A1 ZA 9900009 W ZA9900009 W ZA 9900009W WO 9950531 A1 WO9950531 A1 WO 9950531A1
Authority
WO
WIPO (PCT)
Prior art keywords
stabilizer
undulations
rock
tubular
slot
Prior art date
Application number
PCT/ZA1999/000009
Other languages
English (en)
Inventor
Craig John Smith
Original Assignee
Craig John Smith
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 Craig John Smith filed Critical Craig John Smith
Priority to AU33892/99A priority Critical patent/AU3389299A/en
Publication of WO1999050531A1 publication Critical patent/WO1999050531A1/fr

Links

Classifications

    • 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
    • E21D21/004—Bolts held in the borehole by friction all along their length, without additional fixing means

Definitions

  • This invention relates to a rock or stratum stabilizer of the type quite frequently referred to as a "friction stabilizer" and used for installation in drilled holes in rock strata or the like for the purpose of stabilising same against rock fails and disintegration of a rock face, particularly in an underground mining situation, but also in quarries and tunnels, for example. More particularly, the invention relates to a rock stabilizer of the general form of an elongate tubular member having a slot extending through the wall along the length thereof (thus forming a circumferential gap) to enable it to contract diametrically as it is forced into a rock hole percussively to become frictionally lodged in the hole.
  • the stabilizer has a collar surrounding its operatively outer end which can bear against a washer for engaging a rock wall or alternatively for holding a mesh in position over a rock wall.
  • rock or stratum stabilizers Numerous different types have been proposed in the past and these include the well known rock bolts, roof bolts and friction stabilizers with which this invention is concerned.
  • Rock bolts and the like are in modern times, generally grouted into their holes although expansion units can also be used for this purpose.
  • Rock and roof bolts are regarded as being permanent stabilizers whilst the tubular friction stabilizers with which this invention is concerned are usually regarded as being temporary in nature. The reason for the latter is that the metal from which the tubular stabilizer is produced tends to corrode thus limiting the useful life of the stabilizer.
  • the collar is generally welded to the outside of the tubular stabilizer and conveniently consists of a torroidal ring which also has a gap in a circumferential direction with the gap being offset by 180 degrees relative to the slot in the tubular stabilizer.
  • Stabilizers of the type commonly available at present operate effectively and serve a purpose.
  • the pull-out resistance is limited and applicant's tests on a 1.2 metre unit indicated that pull-out can occur at about 4 tonnes force, with no grout being present.
  • a tubular stabilizer having a retainer collar at one end, a tapered region at the opposite end, and a slot or circumferential gap extending along the length of the tube, the stabilizer being characterised in that the outer surface of the tube is provided with a series of undulations extending along the length thereof.
  • the undulations to assume the form either of indentations such as inwardly directed grooves extending in a circumferential or helical direction, or for the undulations to be defined by raised zones, such as bumps, ridges or the like; for the stabilizer to be made from sheet metal rolled to form the tubular configuration and provided either before such rolling or afterwards with deformations defining said undulations; and for the collar to have a circumferential gap which is coincident with the slot in the tubular stabilizer.
  • indentations such as inwardly directed grooves extending in a circumferential or helical direction
  • raised zones such as bumps, ridges or the like
  • the stabilizer to be made from sheet metal rolled to form the tubular configuration and provided either before such rolling or afterwards with deformations defining said undulations
  • the collar to have a circumferential gap which is coincident with the slot in the tubular stabilizer.
  • the stabilizer can be made of materials other than metal provided that it exhibits some degree of resilience, and adequate deformability.
  • the material could be a suitable high tensile steel.
  • the undulations enable the tubular stabilizer to flex along its length more easily into firm contact with the surface of a drilled hole in a rock wall, for example.
  • Tests conducted to date indicate that a 1.2 metre long tubular stabilizer according to the invention and having undulations in the form of spaced circumferential grooves extending inwardly and spaced apart by about 100mm only pulled out at a force of 12 tonnes as opposed to 4 tonnes for the prior art equivalent.
  • FIG.1 is an isometric view of a prior art tubular stabilizer
  • FIG.2 is a similar view of a stabilizer according to the invention
  • FIG.3 illustrates an application of stabilizers in schematic sectional elevation
  • FIG.4 is an enlarged sectional elevation of a portion of a stabilizer according to the invention operatively installed in a drilled hole;
  • FIG.5 is a longitudinal sectional elevation of a part of the length of an alternative embodiment of the invention.
  • tubular stabilizer of the type illustrated in Figure 1 is known.
  • the tubular stabilizer (1) has a smooth outer wall (2) extending along the length thereof and a circumferential gap or slot (3) also extending along the entire length of the stabilizer.
  • the operatively inner end (4) of the stabilizer tapers to allow its introduction into a hole and the operatively outer end (5) has a ring-shaped collar (6) welded to its outer surface. The collar bridges the gap as indicated by numeral (7).
  • the basic construction of the stabilizer is the same, the stabilizer (8) being tubular and having a slot (9) extending along its entire length.
  • undulations in this case in the form of circumferential grooves (10), are formed in the wall of the tube at spacings of about 100mm apart.
  • the grooves could be formed either before or after the rolling or, for that matter, during the rolling operation. Indentations could also be pressed into the tubular stabilizer after it has been formed.
  • the operatively inner end (11) of the stabilizer is tapered to a narrower end (12) to facilitate insertion of the stabilizer into a drilled hole.
  • the collar (13) has its gap (14) in registration with the slot (9) so that the entire outer portion of the stabilizer can be inserted in a hole and flex outwardly without hindrance from the bridge (7) of the prior art stabilizer.
  • stabilizers (9) according to the invention are introduced into pre-drilled holes (15) in a body of rock (16) as shown in Figure 3.
  • a washer (17) is installed on the stabilizer prior to introduction into a hole so that the collar (13) can bear against the washer to transfer force to the rock surface and retain the rock directly and optionally indirectly through a mesh (18).
  • the stabilizer is driven into its operative position using a percussion machine such as a pneumatic hammer, conveniently that of a drill, a hydraulic percussion hammer arrangement, or any other suitable percussive instrument. They may even be driven in manually using a suitable hammer.
  • a percussion machine such as a pneumatic hammer, conveniently that of a drill, a hydraulic percussion hammer arrangement, or any other suitable percussive instrument. They may even be driven in manually using a suitable hammer.
  • FIG 4 there is shown the spaces (19) that are formed between the surface (20) of the hole and the outer surface of the stabilizer.
  • grouting material In the case that grouting material is introduced into the stabilizer, under pressure, grouting material will enter the grooves via the slot (9) and pass around the grooves to substantially encircle the stabilizer at all positions at which grooves are present. It is anticipated that this will greatly enhance the anchoring of the stabilizer in its operative position and will also contribute significantly towards diminishing corrosion of the stabilizer.

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)
  • Piles And Underground Anchors (AREA)

Abstract

L'invention concerne un stabilisateur de roches ou de strates du type connu parfois sous le nom de 'stabilisateur à friction'. Ledit stabilisateur a une forme tubulaire allongée qu'il est commode de fabriquer à partir d'une feuille de métal laminée, et présente sur toute sa longueur une fente ou un intervalle circonférentiel. La surface extérieure du stabilisateur comporte une série d'ondulations telles que des rainures longitudinales circonférentielles ou hélicoïdales.
PCT/ZA1999/000009 1998-03-30 1999-03-30 Stabilisateur de roches a friction WO1999050531A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU33892/99A AU3389299A (en) 1998-03-30 1999-03-30 A friction rock stabilizer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA982622 1998-03-30
ZA98/2622 1998-03-30

Publications (1)

Publication Number Publication Date
WO1999050531A1 true WO1999050531A1 (fr) 1999-10-07

Family

ID=25586917

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ZA1999/000009 WO1999050531A1 (fr) 1998-03-30 1999-03-30 Stabilisateur de roches a friction

Country Status (2)

Country Link
AU (1) AU3389299A (fr)
WO (1) WO1999050531A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003093644A1 (fr) * 2002-04-29 2003-11-13 Welser Profile Ag Procede de fabrication d'une cheville metallique pour exploitation miniere
EP2076652A1 (fr) * 2006-10-03 2009-07-08 Turun Ammattikorkeakoulu Dispositif de fondation
WO2014071442A1 (fr) * 2012-11-12 2014-05-15 Rise Mining Developments Pty Ltd Boulon d'ancrage
WO2024036347A1 (fr) * 2022-08-12 2024-02-15 Botha Raymond Mark Boulon d'ancrage

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1340373A (en) * 1971-07-09 1973-12-12 Pin Set Corp Method and apparatus for setting mine roof pins
US4098087A (en) * 1976-12-02 1978-07-04 Battelle Development Corporation Anchoring bolt and method
US4126004A (en) * 1977-08-04 1978-11-21 Ingersoll-Rand Company Friction rock stabilizer
US4284379A (en) * 1979-07-25 1981-08-18 Ingersoll-Rand Company Earth structure stabilizer
US4490074A (en) * 1982-01-12 1984-12-25 Ingersoll-Rand Company Friction rock stabilizer and sheathing means, in combination, and method of securing a friction rock stabilizer in an earth bore
US4696606A (en) * 1985-06-17 1987-09-29 Atlas Copco Aktiebolag Method of stabilizing a rock structure
EP0241451A1 (fr) * 1986-04-09 1987-10-14 Mai Pump Austria GmbH Boulon d'ancrage de roche
WO1988002437A1 (fr) * 1986-10-02 1988-04-07 Hilton Allan R Boulons ou ancrages pour renforcer des couches de terre
US5192146A (en) * 1991-08-30 1993-03-09 Simmons-Rand Company Open seam friction rock stabilizer
US5297900A (en) * 1988-10-10 1994-03-29 Witzand Hendrik H Rock stabilizer
US5649790A (en) * 1995-06-22 1997-07-22 Mergen; Douglas Matthew Friction rock stabilizer and method for insertion

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1340373A (en) * 1971-07-09 1973-12-12 Pin Set Corp Method and apparatus for setting mine roof pins
US4098087A (en) * 1976-12-02 1978-07-04 Battelle Development Corporation Anchoring bolt and method
US4126004A (en) * 1977-08-04 1978-11-21 Ingersoll-Rand Company Friction rock stabilizer
US4284379A (en) * 1979-07-25 1981-08-18 Ingersoll-Rand Company Earth structure stabilizer
US4490074A (en) * 1982-01-12 1984-12-25 Ingersoll-Rand Company Friction rock stabilizer and sheathing means, in combination, and method of securing a friction rock stabilizer in an earth bore
US4696606A (en) * 1985-06-17 1987-09-29 Atlas Copco Aktiebolag Method of stabilizing a rock structure
EP0241451A1 (fr) * 1986-04-09 1987-10-14 Mai Pump Austria GmbH Boulon d'ancrage de roche
WO1988002437A1 (fr) * 1986-10-02 1988-04-07 Hilton Allan R Boulons ou ancrages pour renforcer des couches de terre
US5297900A (en) * 1988-10-10 1994-03-29 Witzand Hendrik H Rock stabilizer
US5192146A (en) * 1991-08-30 1993-03-09 Simmons-Rand Company Open seam friction rock stabilizer
US5649790A (en) * 1995-06-22 1997-07-22 Mergen; Douglas Matthew Friction rock stabilizer and method for insertion

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003093644A1 (fr) * 2002-04-29 2003-11-13 Welser Profile Ag Procede de fabrication d'une cheville metallique pour exploitation miniere
EP2076652A1 (fr) * 2006-10-03 2009-07-08 Turun Ammattikorkeakoulu Dispositif de fondation
EP2076652A4 (fr) * 2006-10-03 2012-01-11 Turun Ammattikorkeakoulu Dispositif de fondation
WO2014071442A1 (fr) * 2012-11-12 2014-05-15 Rise Mining Developments Pty Ltd Boulon d'ancrage
WO2024036347A1 (fr) * 2022-08-12 2024-02-15 Botha Raymond Mark Boulon d'ancrage

Also Published As

Publication number Publication date
AU3389299A (en) 1999-10-18

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