CA2022433C - Dynamic earth anchor, and a sleeve therefor - Google Patents
Dynamic earth anchor, and a sleeve thereforInfo
- Publication number
- CA2022433C CA2022433C CA002022433A CA2022433A CA2022433C CA 2022433 C CA2022433 C CA 2022433C CA 002022433 A CA002022433 A CA 002022433A CA 2022433 A CA2022433 A CA 2022433A CA 2022433 C CA2022433 C CA 2022433C
- Authority
- CA
- Canada
- Prior art keywords
- sleeve
- borehole
- pin
- inner diameter
- outer diameter
- 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 - Fee Related
Links
- 238000003780 insertion Methods 0.000 claims abstract description 24
- 230000037431 insertion Effects 0.000 claims abstract description 24
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 9
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 6
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000004873 anchoring Methods 0.000 claims description 2
- 239000011435 rock Substances 0.000 abstract description 11
- 239000011440 grout Substances 0.000 abstract description 8
- 239000012530 fluid Substances 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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
-
- 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
- F16B13/02—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose in one piece with protrusions or ridges on the shaft
-
- 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
- F16B13/14—Non-metallic plugs or sleeves; Use of liquid, loose solid or kneadable material therefor
- F16B13/141—Fixing plugs in holes by the use of settable material
-
- 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
- F16B2013/008—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose used for mining purposes
Abstract
A dynamic earth anchor comprises a plastic sleeve for insertion into a borehole formed therefor in a terrestrial formation, and a rock bolt for insertion into the sleeve, for stabilizing the formation. The sleeve is a hollow body having a conformation which facilitates either its installation into the borehole, or the insertion of the rock bolt thereinto. Additionally, in at least one embodiment thereof, the conformation of the sleeve accommodates for the flow of a fluid, such as a grout, along its outer surface. In another embodiment, the conformation of the sleeve is such as to provide for the rupture of a grout cartridge installed in the borehole in advance of the sleeve.
Description
2 0 ~ 2 4 3 ~ ~
Docket No.: 0311-IR-RD
A DYNAMIC EARTH ANCHOR, AND A SLEEVE THEREFOR
Background of the Invention This invention pertains to dynamic earth anchors, or rock stabilizing fixtures, as the same are also identified, and in particular to such earth anchor so conceived as to facilitate either the insertion of a rock bolt-receiving sleeve into the terrestrial formation borehole, or the insertion of the rock bolt into the sleeve, as well as to sleeves of and for such earth anchors.
Dynamic earth anchors, or rock stabilizing fixtures, are well known. Exemplary thereof is the Dynamic Rock Stabilizing Fixture" set forth the U.S. Patent No. Re 32645 and issued to James J. Scott.
The fixture in the aforesaid patent comprises a sleeve having a hollow body which is inserted into the end of a terrestrial borehole, and a rock bolt which is then inserted into the borehole-seated sleeve. Typically, the bolt will have threads or other disruptions on the surface thereof to enhance its fast engagement with the sleeve.
The combination sets up an almost immediate restraint of the terrestrial formation, and accommodates a roof plate, or the like, at the formation face.
,~
2022~33 Due to discontinuities and/or asperities in the sleeve-receiving borehole, it is frequently difficult to set the sleeve into the termination of the borehole;
difficulties are commonly encountered in inserting the rock bolt into the seated sleeve.
The foregoing illustrates limitations known to exist in present devices. Thus, it is apparent that it would be advantageous to provide an alternative directed to overcoming one or more of the limitations set forth above. Accordingly, a suitable alternative is provided including features more fully described hereinafter.
Summary of the Invention In one aspect of the invention, this is accomplished by a sleeve, for use in such an aforesaid dynamic earth anchor, for insertion thereof into a terrestrial borehole, and for insertion thereinto of a roof bolt, comprising a hollow body defining an endless wall; the body being formed of deformable material; and the wall having a conformation for facilitating at least one of the aforesaid insertions.
According to a further broad aspect of the present invention, there is provided an apparatus comprising a sleeve insertable into a borehole, the said borehole having an inner diameter. A roof pin, to be inserted into the sleeve, has an outer diameter which is less than the borehole inner diameter. The sleeve has a continuous, circumferential outer surface without any structural interruptions. The outer surface having a uniform sleeve outer diameter equal to or smaller than 2~2~4~3 the borehole inner diameter after insertion of the sleeve into the borehole and prior to insertion of the roof pin into the sleeve. The sleeve has an inner surface containing at least one longitudinally extending yieldable channel portion which has a lesser thickness than the remainder of the sleeve, sufficient circumferential expansion of the channel portions permitting circumferential expansion of the sleeve to establish a restraint between the roof pin and the borehole.
According to a further broad aspect of the present invention, there is provided an apparatus which comprises a sleeve insertable into a borehole, the borehole having an inner diameter, and the sleeve, when undeformed, having an outer diameter equal to or smaller than the borehole inner diameter. A roof pin, to be inserted into the sleeve, has an outer diameter which is less than the borehole inner diameter. The sleeve has a continuous, circumferential inner surface without any structural interruptions. The inner surface has a uniform sleeve inner diameter after insertion of the sleeve into the borehole and prior to insertion of the roof pin into the sleeve. The sleeve has an outer surface containing at least one longitudinally extending yieldable channel portion which has a lesser thickness than the remainder of the sleeve, sufficient circumferential expansion of the channel portions permitting circumferential expansion of the sleeve to establish a restraint between the roof pin and the borehole. The sleeve has a first and second axial end.
The channel extends spirally between the first and the second axial ends of the sleeve.
According to a still further broad aspect of the present invention, there is provided an anchor -2a-, -2o22433 for stabilizing a terrestrial formation. The anchor comprises a sleeve insertable into a borehole formed in the terrestrial formation. The borehole has an inner diameter, the sleeve, when undeformed, having an outer diameter equal to or smaller than the inner diameter.
A pin is insertable into the sleeve and has an outer diameter less than the borehole inner diameter. The sleeve has a substantially cylindrical continuous peripheral outer surface and an inner surface. The peripheral outer surface has a substantially constant sleeve outer diameter after insertion of the sleeve into the borehole and prior to insertion of the pin into the sleeve. The inner surface has a longitudinally extending yieldable channel portion with a lesser sleeve thickness lS than the remainder of the sleeve, sufficient circumferential expansion of the channel portions permitting radial expansion of the sleeve outer diameter upon insertion of the pin into the sleeve to establish anchoring between the sleeve and the borehole.
The foregoing and other aspects will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawing figures. It is to be expressly understood, however, that -2b-Docket No.: 0311-IR-RD
the drawing figures are not intended as a definition of the invention but are for the purpose of illustration only.
Brief Description of the Drawing Figures s In the drawing:
Fig. 1 is a perspective illustration of a first embodiment of the novel sleeve;
Fig. 2 is a depiction of the leading end of a threaded roof bolt made fast in the sleeve of Fig. 1, the same comprising an embodiment of the novel dynamic earth anchor:
Fig. 3 is a perspective illustration of a second embodiment of the novel sleeve;
Fig. 4 is a perspective depiction of a third embodiment of the inventive sleeve;
Figs. 5, 6, and 7 are longitudinal cross-sectional views of further embodiments of the sleeve of the invention;
and Fig. ~ illustrates a channel spirally disposed along the elongated outer surface of the sleeve body.
Docket No.: 0311-IR-RD
Detailed Description As shown in Fig. 1, a sleeve 10, according to this embodiment thereof, comprises a body 12 which is hollow, defining the same as an endless wall. The body is formed of a deformable plastic material, and has four, equally-spaced apart channels 14 formed in the outer surface thereof. Now, the outer diameter of the sleeve 10 is substantially identical to that of the borehole into which it is to be inserted, and the inside diameter thereof is smaller than the greatest outside diameter of the roof bolt or rock bolt which is to be inserted into the sleeve. (For the purposes of this disclosure, roof bolt and rock bolt will be used interchangeably, as they mean the same thing.) Clearly, it requires some reasonable force to get the leading end of a roof bolt fully inserted into the undersized sleeve 10.
Consequently, to minimize the force required, the channels 14 are provided as yieldable portions of the sleeve 10 which can splay and widen, before the inserting roof bolt, to make bolt entry easier to accomplish. As represented in Fig. 2, the roof bolt 16 has entered the sleeve 10 and the channels have spread to give it entry.
` The sleeve of Fig. 3 is an alternative embodiment in which there is but a single yieldable channel 20, and here the latter is formed in the inner surface of the sleeve.
`
2022~33 Docket No.: 0311-IR-RD
Where the embodiments of Figs. 1 through 3 depicted sleeves 10 and 18 configured to facilitate the entry of the roof bolt 16 thereinto, Fig. 4 shows an embodiment of a sleeve 22 which is an overall, outermost dimension which is smaller than the diameter of the borehole into which it is to be inserted. This embodiment is set forth to facilitate the entry of the sleeve 22 into the borehole without undue difficulty. The borehole is represented by the dashed outline, and the sleeve 22, of a substantially cruciform shape, is somewhat collapsed. The flutes or depressions 24 obtaining between the lobes 26 will expand, upon the insertion of a roof bolt thereinto, and the sleeve 22 will assume a circular shape and be pressed firmly into the wall of the borehole. This embodiment may also include a channel 20a.
Figs. 5, 6 and 7 show, in longitudinal cross-section, further embodiments of sleeves 28, 30, 32, respectively, which are configured to facilitate their entry into a borehole. Sleeve 28 has a tapered front or leading end 34.
Sleeve 30 has a taper running the fully length thereof, with the narrowest portion being at the leading end, i.e., the bore entry end, thereof. Sleeve 32 is similar to sleeve 28;
it is tapered only at the leading end thereof. In addition, however, sleeve 32 has a knife edge 36 at the termination of the taper. This offers a particular advantage. Frequently, - 2a22433 :: -Docket No.: 0311-IR-RD
such sleeves used in dynamic earth anchors are grouted in place. To this end, a cartridge of grout is placed in the borehole in advance of the sleeve. The knife edge 36 of sleeve 32 will, when forced into the borehole, following the insertion of a cartridge of grout, rupture the grout cartridge, and permit the grout to flow.
Reverting to the sleeve 10, of Fig. 1, and having remarked about the use of grout, it is to be noted that the channels 14 will also serve as conduits for the flow of the fluid grout along the length of the sleeve 10. Therefore, as required in the circumstances, sleeve 10 can be modified to incorporate a knife edge (such as 36 of sleeve 32), or sleeve 32 could be formed with channels (such as those in sleeve 10). These, and all other embodiments and modifications of the novel sleeves, and the dynamic earth anchor (Fig. 2) of which they are component parts, are deemed to be prefigured by this disclosure, and embraced by the appended claims.
As a further alternative, Fig. 8 illustrates a spirally disposed channel 40 formed to extend along an outer surface 42 of body 44. Channel 40 extends substantially between a first end 46 and a second end 48 of body 44. Also, in Fig.
Docket No.: 0311-IR-RD
A DYNAMIC EARTH ANCHOR, AND A SLEEVE THEREFOR
Background of the Invention This invention pertains to dynamic earth anchors, or rock stabilizing fixtures, as the same are also identified, and in particular to such earth anchor so conceived as to facilitate either the insertion of a rock bolt-receiving sleeve into the terrestrial formation borehole, or the insertion of the rock bolt into the sleeve, as well as to sleeves of and for such earth anchors.
Dynamic earth anchors, or rock stabilizing fixtures, are well known. Exemplary thereof is the Dynamic Rock Stabilizing Fixture" set forth the U.S. Patent No. Re 32645 and issued to James J. Scott.
The fixture in the aforesaid patent comprises a sleeve having a hollow body which is inserted into the end of a terrestrial borehole, and a rock bolt which is then inserted into the borehole-seated sleeve. Typically, the bolt will have threads or other disruptions on the surface thereof to enhance its fast engagement with the sleeve.
The combination sets up an almost immediate restraint of the terrestrial formation, and accommodates a roof plate, or the like, at the formation face.
,~
2022~33 Due to discontinuities and/or asperities in the sleeve-receiving borehole, it is frequently difficult to set the sleeve into the termination of the borehole;
difficulties are commonly encountered in inserting the rock bolt into the seated sleeve.
The foregoing illustrates limitations known to exist in present devices. Thus, it is apparent that it would be advantageous to provide an alternative directed to overcoming one or more of the limitations set forth above. Accordingly, a suitable alternative is provided including features more fully described hereinafter.
Summary of the Invention In one aspect of the invention, this is accomplished by a sleeve, for use in such an aforesaid dynamic earth anchor, for insertion thereof into a terrestrial borehole, and for insertion thereinto of a roof bolt, comprising a hollow body defining an endless wall; the body being formed of deformable material; and the wall having a conformation for facilitating at least one of the aforesaid insertions.
According to a further broad aspect of the present invention, there is provided an apparatus comprising a sleeve insertable into a borehole, the said borehole having an inner diameter. A roof pin, to be inserted into the sleeve, has an outer diameter which is less than the borehole inner diameter. The sleeve has a continuous, circumferential outer surface without any structural interruptions. The outer surface having a uniform sleeve outer diameter equal to or smaller than 2~2~4~3 the borehole inner diameter after insertion of the sleeve into the borehole and prior to insertion of the roof pin into the sleeve. The sleeve has an inner surface containing at least one longitudinally extending yieldable channel portion which has a lesser thickness than the remainder of the sleeve, sufficient circumferential expansion of the channel portions permitting circumferential expansion of the sleeve to establish a restraint between the roof pin and the borehole.
According to a further broad aspect of the present invention, there is provided an apparatus which comprises a sleeve insertable into a borehole, the borehole having an inner diameter, and the sleeve, when undeformed, having an outer diameter equal to or smaller than the borehole inner diameter. A roof pin, to be inserted into the sleeve, has an outer diameter which is less than the borehole inner diameter. The sleeve has a continuous, circumferential inner surface without any structural interruptions. The inner surface has a uniform sleeve inner diameter after insertion of the sleeve into the borehole and prior to insertion of the roof pin into the sleeve. The sleeve has an outer surface containing at least one longitudinally extending yieldable channel portion which has a lesser thickness than the remainder of the sleeve, sufficient circumferential expansion of the channel portions permitting circumferential expansion of the sleeve to establish a restraint between the roof pin and the borehole. The sleeve has a first and second axial end.
The channel extends spirally between the first and the second axial ends of the sleeve.
According to a still further broad aspect of the present invention, there is provided an anchor -2a-, -2o22433 for stabilizing a terrestrial formation. The anchor comprises a sleeve insertable into a borehole formed in the terrestrial formation. The borehole has an inner diameter, the sleeve, when undeformed, having an outer diameter equal to or smaller than the inner diameter.
A pin is insertable into the sleeve and has an outer diameter less than the borehole inner diameter. The sleeve has a substantially cylindrical continuous peripheral outer surface and an inner surface. The peripheral outer surface has a substantially constant sleeve outer diameter after insertion of the sleeve into the borehole and prior to insertion of the pin into the sleeve. The inner surface has a longitudinally extending yieldable channel portion with a lesser sleeve thickness lS than the remainder of the sleeve, sufficient circumferential expansion of the channel portions permitting radial expansion of the sleeve outer diameter upon insertion of the pin into the sleeve to establish anchoring between the sleeve and the borehole.
The foregoing and other aspects will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawing figures. It is to be expressly understood, however, that -2b-Docket No.: 0311-IR-RD
the drawing figures are not intended as a definition of the invention but are for the purpose of illustration only.
Brief Description of the Drawing Figures s In the drawing:
Fig. 1 is a perspective illustration of a first embodiment of the novel sleeve;
Fig. 2 is a depiction of the leading end of a threaded roof bolt made fast in the sleeve of Fig. 1, the same comprising an embodiment of the novel dynamic earth anchor:
Fig. 3 is a perspective illustration of a second embodiment of the novel sleeve;
Fig. 4 is a perspective depiction of a third embodiment of the inventive sleeve;
Figs. 5, 6, and 7 are longitudinal cross-sectional views of further embodiments of the sleeve of the invention;
and Fig. ~ illustrates a channel spirally disposed along the elongated outer surface of the sleeve body.
Docket No.: 0311-IR-RD
Detailed Description As shown in Fig. 1, a sleeve 10, according to this embodiment thereof, comprises a body 12 which is hollow, defining the same as an endless wall. The body is formed of a deformable plastic material, and has four, equally-spaced apart channels 14 formed in the outer surface thereof. Now, the outer diameter of the sleeve 10 is substantially identical to that of the borehole into which it is to be inserted, and the inside diameter thereof is smaller than the greatest outside diameter of the roof bolt or rock bolt which is to be inserted into the sleeve. (For the purposes of this disclosure, roof bolt and rock bolt will be used interchangeably, as they mean the same thing.) Clearly, it requires some reasonable force to get the leading end of a roof bolt fully inserted into the undersized sleeve 10.
Consequently, to minimize the force required, the channels 14 are provided as yieldable portions of the sleeve 10 which can splay and widen, before the inserting roof bolt, to make bolt entry easier to accomplish. As represented in Fig. 2, the roof bolt 16 has entered the sleeve 10 and the channels have spread to give it entry.
` The sleeve of Fig. 3 is an alternative embodiment in which there is but a single yieldable channel 20, and here the latter is formed in the inner surface of the sleeve.
`
2022~33 Docket No.: 0311-IR-RD
Where the embodiments of Figs. 1 through 3 depicted sleeves 10 and 18 configured to facilitate the entry of the roof bolt 16 thereinto, Fig. 4 shows an embodiment of a sleeve 22 which is an overall, outermost dimension which is smaller than the diameter of the borehole into which it is to be inserted. This embodiment is set forth to facilitate the entry of the sleeve 22 into the borehole without undue difficulty. The borehole is represented by the dashed outline, and the sleeve 22, of a substantially cruciform shape, is somewhat collapsed. The flutes or depressions 24 obtaining between the lobes 26 will expand, upon the insertion of a roof bolt thereinto, and the sleeve 22 will assume a circular shape and be pressed firmly into the wall of the borehole. This embodiment may also include a channel 20a.
Figs. 5, 6 and 7 show, in longitudinal cross-section, further embodiments of sleeves 28, 30, 32, respectively, which are configured to facilitate their entry into a borehole. Sleeve 28 has a tapered front or leading end 34.
Sleeve 30 has a taper running the fully length thereof, with the narrowest portion being at the leading end, i.e., the bore entry end, thereof. Sleeve 32 is similar to sleeve 28;
it is tapered only at the leading end thereof. In addition, however, sleeve 32 has a knife edge 36 at the termination of the taper. This offers a particular advantage. Frequently, - 2a22433 :: -Docket No.: 0311-IR-RD
such sleeves used in dynamic earth anchors are grouted in place. To this end, a cartridge of grout is placed in the borehole in advance of the sleeve. The knife edge 36 of sleeve 32 will, when forced into the borehole, following the insertion of a cartridge of grout, rupture the grout cartridge, and permit the grout to flow.
Reverting to the sleeve 10, of Fig. 1, and having remarked about the use of grout, it is to be noted that the channels 14 will also serve as conduits for the flow of the fluid grout along the length of the sleeve 10. Therefore, as required in the circumstances, sleeve 10 can be modified to incorporate a knife edge (such as 36 of sleeve 32), or sleeve 32 could be formed with channels (such as those in sleeve 10). These, and all other embodiments and modifications of the novel sleeves, and the dynamic earth anchor (Fig. 2) of which they are component parts, are deemed to be prefigured by this disclosure, and embraced by the appended claims.
As a further alternative, Fig. 8 illustrates a spirally disposed channel 40 formed to extend along an outer surface 42 of body 44. Channel 40 extends substantially between a first end 46 and a second end 48 of body 44. Also, in Fig.
3, it is illustrated in dotted line, that channel 20 can be spirally disposed along an inner surface of sleeve 18.
, :
20224~3 Docket No.: 0311-IR-RD
Accordingly, while I have described my invention in connection with specific embodiments thereof, it is to be clearly understood that this is done only by way of example and not as a limitation to the scope of my invention, as set S forth in the appended claims.
, :
20224~3 Docket No.: 0311-IR-RD
Accordingly, while I have described my invention in connection with specific embodiments thereof, it is to be clearly understood that this is done only by way of example and not as a limitation to the scope of my invention, as set S forth in the appended claims.
Claims (5)
1. an apparatus comprising:
A sleeve insertable into a borehole, the borehole having an inner diameter;
a roof pin to be inserted into the sleeve, the roof pin having an outer diameter which is less than the borehole inner diameter;
the sleeve having a continuous, circumferential outer surface without any structural interruptions, the outer surface having a uniform sleeve outer diameter equal to or smaller than said borehole inner diameter after insertion of the sleeve into the borehole and prior to insertion of the roof pin into the sleeve; and said sleeve having an inner surface containing at least one longitudinally extending yieldable channel portion which has a lesser thickness than the remainder of the sleeve, sufficient circumferential expansion of the channel portions permitting circumferential expansion of said sleeve to establish a restraint between the roof pin and the borehole.
A sleeve insertable into a borehole, the borehole having an inner diameter;
a roof pin to be inserted into the sleeve, the roof pin having an outer diameter which is less than the borehole inner diameter;
the sleeve having a continuous, circumferential outer surface without any structural interruptions, the outer surface having a uniform sleeve outer diameter equal to or smaller than said borehole inner diameter after insertion of the sleeve into the borehole and prior to insertion of the roof pin into the sleeve; and said sleeve having an inner surface containing at least one longitudinally extending yieldable channel portion which has a lesser thickness than the remainder of the sleeve, sufficient circumferential expansion of the channel portions permitting circumferential expansion of said sleeve to establish a restraint between the roof pin and the borehole.
2. The apparatus as described in claim 1, wherein said sleeve has a longitudinal axis, and the channel extends substantially parallel to the longitudinal axis.
3. The apparatus as described in claim 1, wherein said sleeve has a first and a second axial end, and the channel extends spirally between the first and the second axial end.
4. An apparatus comprising:
a sleeve insertable into a borehole, the borehole having an inner diameter, the sleeve, when undeformed, having an outer diameter equal to or smaller than the borehole inner diameter;
a roof pin to be inserted into the sleeve, the roof pin having an outer diameter which is less than the borehole inner diameter;
the sleeve having a continuous, circumferential inner surface without any structural interruptions, the inner surface having a uniform sleeve inner diameter after insertion of the sleeve into the borehole and prior to insertion of the roof pin into the sleeve;
the sleeve having an outer surface containing at least one longitudinally extending yieldable channel portion which has a lesser thickness than the remainder of the sleeve, sufficient circumferential expansion of the channel portions permitting circumferential expansion of the sleeve to establish a restraint between the roof pin and the borehole; and the sleeve having a first and a second axial end, and the channel extending spirally between the first and the second axial ends of the sleeve.
a sleeve insertable into a borehole, the borehole having an inner diameter, the sleeve, when undeformed, having an outer diameter equal to or smaller than the borehole inner diameter;
a roof pin to be inserted into the sleeve, the roof pin having an outer diameter which is less than the borehole inner diameter;
the sleeve having a continuous, circumferential inner surface without any structural interruptions, the inner surface having a uniform sleeve inner diameter after insertion of the sleeve into the borehole and prior to insertion of the roof pin into the sleeve;
the sleeve having an outer surface containing at least one longitudinally extending yieldable channel portion which has a lesser thickness than the remainder of the sleeve, sufficient circumferential expansion of the channel portions permitting circumferential expansion of the sleeve to establish a restraint between the roof pin and the borehole; and the sleeve having a first and a second axial end, and the channel extending spirally between the first and the second axial ends of the sleeve.
5. An anchor for stabilizing a terrestrial formation comprising:
a sleeve insertable into a borehole formed in the terrestrial formation, the borehole having an inner diameter, the sleeve, when undeformed, having an outer diameter equal to or smaller than said inner diameter;
a pin insertable into the sleeve, the pin having an outer diameter less than the borehole inner diameter;
said sleeve having a substantially cylindrical continuous peripheral outer surface and an inner surface;
said peripheral outer surface having a substantially constant sleeve outer diameter after insertion of the sleeve into the borehole and prior to insertion of the pin into the sleeve; and said inner surface having a longitudinally extending yieldable channel portion with a lesser sleeve thickness than the remainder of the sleeve, sufficient circumferential expansion of the channel portions permitting radial expansion of the sleeve outer diameter upon insertion of the pin into the sleeve to establish anchoring between the sleeve and the borehole.
a sleeve insertable into a borehole formed in the terrestrial formation, the borehole having an inner diameter, the sleeve, when undeformed, having an outer diameter equal to or smaller than said inner diameter;
a pin insertable into the sleeve, the pin having an outer diameter less than the borehole inner diameter;
said sleeve having a substantially cylindrical continuous peripheral outer surface and an inner surface;
said peripheral outer surface having a substantially constant sleeve outer diameter after insertion of the sleeve into the borehole and prior to insertion of the pin into the sleeve; and said inner surface having a longitudinally extending yieldable channel portion with a lesser sleeve thickness than the remainder of the sleeve, sufficient circumferential expansion of the channel portions permitting radial expansion of the sleeve outer diameter upon insertion of the pin into the sleeve to establish anchoring between the sleeve and the borehole.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US38841089A | 1989-08-02 | 1989-08-02 | |
| US388,410 | 1989-08-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2022433A1 CA2022433A1 (en) | 1991-02-03 |
| CA2022433C true CA2022433C (en) | 1996-10-22 |
Family
ID=23534013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002022433A Expired - Fee Related CA2022433C (en) | 1989-08-02 | 1990-08-01 | Dynamic earth anchor, and a sleeve therefor |
Country Status (5)
| Country | Link |
|---|---|
| AU (1) | AU631670B2 (en) |
| CA (1) | CA2022433C (en) |
| FR (1) | FR2650625B1 (en) |
| GB (1) | GB2234568B (en) |
| ZA (1) | ZA906021B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19819724A1 (en) * | 1998-05-02 | 1999-11-04 | Hilti Ag | Dowels |
| SE9902065L (en) * | 1999-06-04 | 2000-05-22 | Atlas Copco Rock Drills Ab | Tubular mounting bolt |
| US6935811B2 (en) | 2002-11-13 | 2005-08-30 | Terrasimco Inc. | Frictional mining bolt |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL43544C (en) * | 1932-11-08 | |||
| GB499397A (en) * | 1937-05-19 | 1939-01-19 | Joseph Stanley Smith | An improved wall plug |
| GB569774A (en) * | 1943-11-19 | 1945-06-07 | Thomas Bruno Rule | Improvements in wall plugs and bolt fastenings |
| GB774002A (en) * | 1954-08-26 | 1957-05-01 | L H Newton & Co Ltd | Anchorage bolts |
| GB916813A (en) * | 1959-08-05 | 1963-01-30 | Metal Res & Dev Ltd | An improved wall plug |
| BE794800A (en) * | 1972-02-04 | 1973-05-16 | Omnitechnic G M B H Chemisch T | BUFFER OR ANCHORING ELEMENT |
| AU524865B2 (en) * | 1976-11-05 | 1982-10-07 | Vanos Waldemar Roering | Ground anchor |
| US4284379A (en) * | 1979-07-25 | 1981-08-18 | Ingersoll-Rand Company | Earth structure stabilizer |
| US4636115A (en) * | 1980-11-10 | 1987-01-13 | The Curators Of The University Of Missouri | Expansion bolt and mine roof reinforcement therewith |
| AU538352B2 (en) * | 1981-03-10 | 1984-08-09 | Ingersoll-Rand Co. | Friction stabilizer |
| AU559286B2 (en) * | 1981-05-06 | 1987-03-05 | Allan Henry George Brown | Two part expansion sleeve |
| US4501515A (en) * | 1982-06-25 | 1985-02-26 | Scott Investment Partners | Dynamic rock stabilizing fixture |
| AU5101485A (en) * | 1984-12-10 | 1986-06-19 | Hall, Alethea Rosalind Melanie | Ancor bolt of plastic with aligned molecular chains |
-
1990
- 1990-07-31 ZA ZA906021A patent/ZA906021B/en unknown
- 1990-08-01 AU AU60071/90A patent/AU631670B2/en not_active Ceased
- 1990-08-01 CA CA002022433A patent/CA2022433C/en not_active Expired - Fee Related
- 1990-08-02 FR FR9009914A patent/FR2650625B1/en not_active Expired - Fee Related
- 1990-08-02 GB GB9017009A patent/GB2234568B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| GB9017009D0 (en) | 1990-09-19 |
| GB2234568A (en) | 1991-02-06 |
| AU6007190A (en) | 1991-06-27 |
| AU631670B2 (en) | 1992-12-03 |
| CA2022433A1 (en) | 1991-02-03 |
| GB2234568B (en) | 1993-09-15 |
| ZA906021B (en) | 1991-05-29 |
| FR2650625A1 (en) | 1991-02-08 |
| FR2650625B1 (en) | 1997-08-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |