GB2137713A - Rock anchor bolt assembly - Google Patents

Rock anchor bolt assembly Download PDF

Info

Publication number
GB2137713A
GB2137713A GB08407604A GB8407604A GB2137713A GB 2137713 A GB2137713 A GB 2137713A GB 08407604 A GB08407604 A GB 08407604A GB 8407604 A GB8407604 A GB 8407604A GB 2137713 A GB2137713 A GB 2137713A
Authority
GB
United Kingdom
Prior art keywords
component
flange
bolt
shells
bolt assembly
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.)
Withdrawn
Application number
GB08407604A
Other versions
GB8407604D0 (en
Inventor
Eric Arthur Jackson
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.)
PERARD TORQUE TENSION Ltd
Original Assignee
PERARD TORQUE TENSION Ltd
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
Priority claimed from GB838320522A external-priority patent/GB8320522D0/en
Application filed by PERARD TORQUE TENSION Ltd filed Critical PERARD TORQUE TENSION Ltd
Priority to GB08407604A priority Critical patent/GB2137713A/en
Publication of GB8407604D0 publication Critical patent/GB8407604D0/en
Publication of GB2137713A publication Critical patent/GB2137713A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E21D21/0046—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts formed by a plurality of elements arranged longitudinally
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E21D21/008—Anchoring or tensioning means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
    • F16B13/06—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve
    • F16B13/063—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander
    • F16B13/065—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander fastened by extracting the screw, nail or the like

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Dowels (AREA)

Abstract

The bolt assembly comprises first and second components (11, 25 in Fig. 1) or (111, 116 in Fig. 4) having tapered surfaces (13, 32) or (112, 123) interengaged and urged together, under compressive force applied by a bolt screw-engaged in the first component (11) or (111), to expand the second component (25) or (116) radially for gripping the bore wall. An outwardly projecting peripheral flange (20) or (137) extends at an acute angle to the assembly axis for providing an initial grip of the bore wall to prevent rotation as the bolt is rotated. In the embodiment shown in Fig. 1, the second component (25) is a slotted sleeve and several such sleeves may be arranged end-to-end. The flange (20) is on the first component (11) which receives a nut (15) in which the bolt (40) is engaged. In the embodiment shown in Fig. 4, the second component comprises a pair of part-cylindrical shells (119, 120) encasing a tapered nut forming the first component (111) and a resilient collar (129) is snap-engaged on the shells to hold them together at one end. The collar (129) is provided with the flange (137). The shells are fastened at the opposite end by a flexible and/or frangible O-ring (133) which permits radial expansion. <IMAGE>

Description

SPECIFICATION Bolt assembly This invention relates to a bolt assembly which is capable of being secured in a bore formed in rock or other material.
Such bolt assemblies are used for forming an anchor point. One known assembly comprises a nut having a tapered outer surface and a pair of shells which substantially encase the nut. The shells together define tapered inner surfaces which engage the outer surface of the nut, so that, when a bolt is screwed into the nut and the nut is held against rotation, the nut moves along the shells and urges them apart to cause them to grip the wall of the bore. Rotation of the nut relative to the shells is prevented by means of a projection engaging between the nut and the shells or by making the outer surface of the nut non-circular.
Rotation of the shells relative to the bore also has to be prevented and this is effected by a spring interconnecting the shells at one end and urging them apart to provide an initial grip between the shells and the bore wall. A flanged and apertured cap engages the shells at the opposite end to the spring to hold the shells together and this cap becomes detached as the assembly is inserted in the bore, to permit the spring to be effective.
For the purpose of interconnecting strata, it is usual to use a long bolt which is secured in the bore by means of a plastics resin.
The present invention is concerned with providing an improved bolt assembly, which can be cheaply and easily manufactured, which avoids the necessity for providing spring-urging of shells apart and which also avoids the necessity to provide a detachable cap.
In accordance with this invention, a bolt assembly comprises a first component having a tapered outer surface and provided with a screwthreaded inner surface or with means for carrying a nut, a second expandable component having a tapered inner surface engageable by the tapered outer surface of the first component, the second component having portions movable apart to expand the transverse dimensions thereof as the first component is forced along the second component by means of a bolt extending within the components and engaged with said screwthreaded inner surface or a nut carried by the first component, the assembly being provided with a flexible and/or resilient outwardly projecting peripheral flange, the flange extending at an oblique angle to the longitudinal axis of the assembly and being constructed to grip the wall of a bore, in which the assembly is inserted, to prevent initial rotation of the assembly in the bore as the bolt is turned to initiate expansion of the second component.
In one embodiment, the first component is provided with the flange and only an end portion of the component engages in the second component. The flange is preferably, adjacent the end opposite to said end portion and, advantageously, extends towards said end portion.
In another embodiment, the first component is encased within the second component and the flange is provided on the second component.
The second component may comprise a slotted cylindrical plastics moulding or may, in the second embodiment, comprise a pair of separately formed part-cylindrical shells fastened together at each end, the fastening means at at least one end being flexible or frangible to permit transverse expansion of the second component.
It is preferred that the fastening means at one end is flexible or frangible and the fastening means at the other end is defined by a third component provided with said flange. The third component may be a resilient plastics moulding of annular form having an axial slot.
Reference is now made to the accompanying drawings, wherein: Figure 1 is a perspective view of a first embodiment of a bolt assembly according to the invention; Figure 2 is a side elevation of the first embodiment showing the first component and a multiplicity of second components; Figure 3 is a side elevation of a second component of a second embodiment of the invention; Figure 4 is a sectional elevation of the second embodiment showing first, second and third components and Figure 5 is an end elevation of the third component.
Referring to Figures 1 and 2, the first component 11 is generally cylindrical and elongate with an axial bore 12 for receiving the shank of a bolt. One end part 1 3 of the component has a frusto-conical external surface 14 and the opposite end part 16 has a recess 1 7 shaped complementary to a polygonal nut 15 for tightly receiving the latter, which bears against a shoulder 18 defined by the annular bottom of the recess.
An annular resilient flange 20 projects from said opposite end part 1 6 at an acute angle to the component axis, so as to extend both outwardly and towards said one end 1 3 of the component.
The flange has slits or cut-out portions (e.g. four slits) to increase flexibility. One of the slits 10 is shown in Figure 2.
The second component 25 is also of generally cylindrical shape and is elongate with an axial bore 26. One end part 27 has a frusto-conical external surface 28. The opposite end part defines a socket portion 29. This portion has an enlarged diameter bore portion including a cylindrical portion 30, defining an internal shoulder 31, and a flared end portion 32. The external surface of the socket portion is cylindrical except for an annular, outwardly directed flange 33 of generally triangular cross-section.
The socket portion has axially extending slits 35 extending from the free end to a round aperture 36.
Both components, as illustrated and described are one-piece plastics mouldings made, for example, from polyamide material, such as nylon.
The components may, however, be made from metal.
As shown in Figure 2, a multiplicity of second components 25 can be "stacked" on the shank of a bolt 40 with the frusto-conical surface of one component engaging in the socket portion of the next. A single first component 11 is provided at an end of the "stack", with its frusto-conical surface engaged in the socket portion of a second component. The shank of the bolt 40 is closely received in the bores of the components (except for the enlarged portions 30, 32 of the second components) to avoid crushing of the components.
The nut 1 5, held by the first component 11, is screw-engaged on the bolt and this component is inserted first in a drilled bore. The flange 20 grips the bore interior wall sufficiently to resist rotation and the flanges 33 similarly grip the bore due to slight expansion of each of the socket portions by the component part engaged therein during insertion.
A washer 41 bears on the end shoulder 37 of the endmost second component, opposite to the first component, and the washer is engaged by a nut 42.
Tightening of the nut 42 consolidates the assembly and causes expansion of all of the socket portions to provide a firm grip in the drilled bore. The slits 35 facilitate expansion and the apertures 36 prevent splitting of the second components by extension of the slits.
Where the first component is made of metal, the nut 1 5 may be an integral part of the component.
The embodiment of Figures 3 to 5 comprises a first component 111 in the form of an elongate nut, made of metal and having a frusto-conical external surface 112 and a screw-threaded internal surface 113. boss 114 projects radially from the outer surface 112.
A second component 11 6 comprises a pair of identical shells 11 7, 118, each of generally partcylindrical shape. The two shells fit together to define a pair of diametrally opposed, elongate, axially extending slots 119, 120. The component, when the shells are fitted together, has a hollow interior defining a cylindrical bore portion 121 adjacent an aperture 122 at one end 1 30 of the component, the cylindrical bore portion leading into a frusto-conical bore portion 123 which terminates in a shoulder 124. The shells are, preferably, plastics mouldings.
As shown in Figure 5, the outer surface 112 of the first component 11 6 is complementary to the frusto-conical bore portion 1 23 and the first component is encased in the second component.
The boss 114 engages in one of the slots 119 to prevent rotation of the first component relative to the second component.
The end part 131 of the component adjacent the second component has a bevelled face 132 to facilitate pushing of the assembly into a bore. The bevelled face has an annular groove 127, which receives a fastening ring 133. This may be a split ring, a stretchable ring or a frangible ring, which permits the shells to be forced apart.
The opposite end part 130 of the second component has an annular groove 134 into which is snap-engaged an annular projection 135 carried by a third component 129. This component comprises a ring 136 provided with an outwardly extending flange 137 and is a plastics moulding.
The flange extends away from the second component at an acute angle to the longitudinal axis of the assembly. The whole of the third component has an axial slot 138 facilitating resilient contraction of the flange when the assembly is inserted into a bore, so that the flange is gripped by the bore wall to resist rotation of the assembly.
In use, a bolt (not shown) is inserted through the aperture 122 and is screw-engaged in the first component. Rotation of the bolt causes the first component to. move down the bolt forcing the shells apart near the end 131 remote from the third component to grip the bore wall tightly.
A disc (not shown) may be provided in the second component in abutment with the shoulder 125, to be engaged by the end of the bolt. In the construction illustrated, a conical recess 140 is provided instead. The wall of the recess is engaged by the bolt and serves to centralise the bolt as well as serving as a bearing surface for the bolt.

Claims (9)

1. A bolt assembly comprising a first component having a tapered outer surface and provided with a screw-threaded inner surface or with means for carry.ing a nut, a second expandable component having a tapered inner surface engageable by the tapered outer surface of the first component, the second component having portions movable apart to expand the transverse dimensions thereof as the first component is forced along the second component by means of a bolt extending within the components and engaged with said screwthreaded inner surface or a nut carried by the first component, the assembly being provided with a flexible and/or resilient outwardly projecting peripheral flange, the flange extending at an oblique angle to the longitudinal axis of the assembly and being constructed to grip the wall of a bore, in which the assembly is inserted, to prevent initial rotation of the assembly in the bore as the bolt is turned to initiate expansion of the second component.
2. A bolt assembly according to Claim 1, wherein the first component is provided with the flange and only an end portion of the first component engages in the second component.
3. A bolt assembly according to Claim 2, wherein the flange is provided adjacent the end of the first component opposite to said end portion.
4. A bolt assembly according to claim 3, wherein the flange extends towards said end portion.
5. A bolt assembly according to Claim 2, 3 or 4, in which the second component has a socket portion for receiving said end portion of the first component, the socket portion being slotted to facilitate transverse expansion as said end portion is urged into the socket portion, and an outwardly extending peripheral flange on the socket portion for gripping the bore wall, in use.
6. A bolt assembly according to Claim 1, wherein the first component is encased within the second component, and the flange is provided on the second component.
7. A bolt assembly according to Claim 6, wherein the second component comprises a pair of separately formed part-cylindrical shells fastened together, the fastening means including a flexible or frangible part to permit transverse expansion of the second component.
8. A bolt assembly according to Claim 7, wherein flexible or frangible fastening means is provided adjacent one end of the shells and the second component includes a separately formed member provided with said flange and engaged with the shells adjacent the opposite end thereof to hold the shells together at said opposite end.
9. A bolt assembly according to Claim 8, wherein said member comprises a resilient collar, the shells and the collar having snap-engageable formations mounting the collar on the shells.
1 0. A bolt assembly constructed substantially as herein described with reference to Figures 3, 4 and 5 of the accompanying drawings.
GB08407604A 1983-04-08 1984-03-23 Rock anchor bolt assembly Withdrawn GB2137713A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08407604A GB2137713A (en) 1983-04-08 1984-03-23 Rock anchor bolt assembly

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB8309545 1983-04-08
GB838320522A GB8320522D0 (en) 1983-04-08 1983-07-29 Bolt assembly
GB08407604A GB2137713A (en) 1983-04-08 1984-03-23 Rock anchor bolt assembly

Publications (2)

Publication Number Publication Date
GB8407604D0 GB8407604D0 (en) 1984-05-02
GB2137713A true GB2137713A (en) 1984-10-10

Family

ID=27262043

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08407604A Withdrawn GB2137713A (en) 1983-04-08 1984-03-23 Rock anchor bolt assembly

Country Status (1)

Country Link
GB (1) GB2137713A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169678A (en) * 1985-01-16 1986-07-16 Ward Brothers Securing a threaded member to a further member
GB2179114A (en) * 1985-08-08 1987-02-25 Lionel William Jenkins Attachment for tubular body
DE102005042701A1 (en) * 2005-09-01 2007-03-08 Torras-Piqué, Jorge Arrangement to control water flow in irrigating installation fed by water supply connected to pump has device which produces control signal emitted as radio signal to switch on of off water supply to feed pump
AU2004210565B2 (en) * 2003-09-18 2009-10-08 Hilti Aktiengesellschaft Anchor Bolt
AU2006252086B2 (en) * 2006-12-18 2012-11-01 Hilti Aktiengesellschaft Self-Drilling Anchor Bolt
GB2590410A (en) * 2019-12-16 2021-06-30 Three Smith Group Ltd Anchor assembly
EP4130426A1 (en) * 2021-08-05 2023-02-08 Sandvik Mining and Construction Australia (Production/Supply) Pty Ltd Driver socket for installation of a ground reinforcement bolt

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB704510A (en) * 1952-05-20 1954-02-24 Rawlplug Co Ltd Improvements in or relating to anchoring devices for use in fixing articles to masonry, walls and the like
GB840741A (en) * 1957-01-03 1960-07-13 Bayliss Jones And Bayliss Ltd Improvements relating to anchor bolts
GB1116640A (en) * 1964-11-20 1968-06-12 Allan George Mcculloch Improvements in or relating to anchor fasteners
GB1197877A (en) * 1969-04-28 1970-07-08 Torque Tension Bolt Company Pr A Roof Bolt
GB1268622A (en) * 1968-06-10 1972-03-29 Rawlplug Co Ltd Expansible anchoring device
GB1343199A (en) * 1970-08-08 1974-01-10 Fischer Artur Wall plug
GB1490017A (en) * 1974-07-11 1977-10-26 Berner A Anchorage device for wood or machine screws
GB2024977A (en) * 1978-07-10 1980-01-16 Bassan & Cie Fastening device
GB2072782A (en) * 1980-03-31 1981-10-07 Hilti Ag Expansible dowel

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB704510A (en) * 1952-05-20 1954-02-24 Rawlplug Co Ltd Improvements in or relating to anchoring devices for use in fixing articles to masonry, walls and the like
GB840741A (en) * 1957-01-03 1960-07-13 Bayliss Jones And Bayliss Ltd Improvements relating to anchor bolts
GB1116640A (en) * 1964-11-20 1968-06-12 Allan George Mcculloch Improvements in or relating to anchor fasteners
GB1268622A (en) * 1968-06-10 1972-03-29 Rawlplug Co Ltd Expansible anchoring device
GB1197877A (en) * 1969-04-28 1970-07-08 Torque Tension Bolt Company Pr A Roof Bolt
GB1343199A (en) * 1970-08-08 1974-01-10 Fischer Artur Wall plug
GB1490017A (en) * 1974-07-11 1977-10-26 Berner A Anchorage device for wood or machine screws
GB2024977A (en) * 1978-07-10 1980-01-16 Bassan & Cie Fastening device
GB2072782A (en) * 1980-03-31 1981-10-07 Hilti Ag Expansible dowel

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169678A (en) * 1985-01-16 1986-07-16 Ward Brothers Securing a threaded member to a further member
GB2179114A (en) * 1985-08-08 1987-02-25 Lionel William Jenkins Attachment for tubular body
AU2004210565B2 (en) * 2003-09-18 2009-10-08 Hilti Aktiengesellschaft Anchor Bolt
DE102005042701A1 (en) * 2005-09-01 2007-03-08 Torras-Piqué, Jorge Arrangement to control water flow in irrigating installation fed by water supply connected to pump has device which produces control signal emitted as radio signal to switch on of off water supply to feed pump
AU2006252086B2 (en) * 2006-12-18 2012-11-01 Hilti Aktiengesellschaft Self-Drilling Anchor Bolt
GB2590410A (en) * 2019-12-16 2021-06-30 Three Smith Group Ltd Anchor assembly
GB2590410B (en) * 2019-12-16 2022-03-23 Three Smith Group Ltd Anchor assembly
EP4130426A1 (en) * 2021-08-05 2023-02-08 Sandvik Mining and Construction Australia (Production/Supply) Pty Ltd Driver socket for installation of a ground reinforcement bolt

Also Published As

Publication number Publication date
GB8407604D0 (en) 1984-05-02

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)