CA1126058A - Friction rock stabilizer and method for insertion thereof in an earth structure bore - Google Patents
Friction rock stabilizer and method for insertion thereof in an earth structure boreInfo
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- CA1126058A CA1126058A CA371,890A CA371890A CA1126058A CA 1126058 A CA1126058 A CA 1126058A CA 371890 A CA371890 A CA 371890A CA 1126058 A CA1126058 A CA 1126058A
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- stabilizer
- bore
- dimension
- friction rock
- transverse dimension
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Abstract
A FRICTION ROCK STABILIZER AND METHOD FOR INSERTION
THEREOF IN AN EARTH STRUCTURE BORE
Abstract of the Disclosure The stabilizer, according to a preferred embodiment thereof, comprises a generally tubular body which is axially slit, according to the prior art. According to the invention, the surfaces of the body immediately adjacent to the slit nave ribs formed thereon which define bearing surfaces for clamping together, to draw the surfaces together, closing the slit, and thereby contract the stabilizer to facilitate its insertion into an undersized bore.
The novel method, then, comprises contracting an axially slit friction rock stabilizer by engaging the aforesaid ribs (formed thereon) with a tool, to contract the stabilizer to a reduced and constrained cross-sectional dimension, inserting the stabilizer into an undersized bore, and releasing it therein, in order that it may engage and stabilize the surface of the bore (of the earth structure).
THEREOF IN AN EARTH STRUCTURE BORE
Abstract of the Disclosure The stabilizer, according to a preferred embodiment thereof, comprises a generally tubular body which is axially slit, according to the prior art. According to the invention, the surfaces of the body immediately adjacent to the slit nave ribs formed thereon which define bearing surfaces for clamping together, to draw the surfaces together, closing the slit, and thereby contract the stabilizer to facilitate its insertion into an undersized bore.
The novel method, then, comprises contracting an axially slit friction rock stabilizer by engaging the aforesaid ribs (formed thereon) with a tool, to contract the stabilizer to a reduced and constrained cross-sectional dimension, inserting the stabilizer into an undersized bore, and releasing it therein, in order that it may engage and stabilize the surface of the bore (of the earth structure).
Description
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This invention pertains to friction rock stabilizers, and methods for insertion of such in earth structure bores, and particularly to an improved friction rock stabilizer so configured as to facilitate its contraction to render its insertion into an undersized earth structure bore more facile, and to a method for insertion of friction rock stabilizers into undersized earth structure bores.
Friction rock stabilizers are relatively new earth struc-ture stabilizing devices, and such are best exemplified by U.S, Patent No. 3,922,867, issued December 2, 1975, and U.S.
Pater,t No. 4,012,913, issued March `22, 1977, both granted to James J, Scott, According to the teachings in the referenced Patents, friction rock stabilizers comprise generally tubular bodies which may be axially slit ! and which have a free cross-sectional dimension predetermined to be larger than the transVerse dimen-sion of the earth structure bores into which they are to be in-serted. Accordingly, it requires considerable thrusting ~orce to insert such a stabilizer into an undersized bore, The stabilizer must contract, to accommodate insertion, whereby the slit is substantially closed during lnsertion and, after insertion, the stabilizer attempts to rsturn to its original free dimension; thus it frictionally holds fast to the wall of the bore and, consequently, stabillzes the~earth structure.
It is an object of this invention to disclose both a fric-tion rock stabilizer having means formed thereon to facilitate a pre-insertion contraction thereof for contracted installa-tion in an u~dersized bore~ and also a method comprising the pre-insertion contraction, insertion, and contraction release 'riction roc]c stabilizers.
5~
Particularly, it is an object of this invention to se-t for-th a friction rock stabilizer for insertion in a bore formed in an earth structure for stabilizing the structure, comprising a generally tubular body, said body having an elongate axis and wall means for frictionally engaging the surface of an earth structure bore, said body further having a first, free, relaxed, transverse dimension predetermined to be larger than the transverse dimension of a bore into which it is to be in-serted; and said body also having an axially-extended slit formed through said wall means thereof to permit said body to assume a second, constrained, transverse dimension which is smaller than both said first transverse dimension and the transverse dimension of a bore into which it is to be inserted wherein said wall means has confronting axially-extended and spaced-apart surfaces which: (1) define said slit therebetween, and (2) have key means formed adjacent to said slit-defining surfaces for: (a) receiving contraction forces thereat9 and (b) responsive to such forces, for moving said slit-defining surfaces toward each other.
Another object of this invention is to set forth a friction rock stabilizer, for insertion in a bore formed in an earth structure for stabilizing the structure, comprising a generally tubular body, said body having an elongate, central axis and wall means for frictionally engaging the surface of an earth structure bore, said body also having means defining an axially-extended separation, of a given width9 in said wall means, and means defining a pair of spaced-apart bearing surfaces, integrally formed on said body and movable relative to each other to vary said separation to a width other than said given width.
_ _ l~Z6~5~3 It is also a further object of this invention to teach a method of inserting a friction rock stabilizer in a bore formed in an earth structure, for stabilizing the structure, wherein the bore has a given transverse dimension, and the stabilizer has a ~irst, free, relaxed, transverse dimension which is greater than said given dimension and is resiliently contractible to a second, constrained, transverse dimension which is slightly less than said given dimension of said bore, comprising the steps of slidably engaging the stabilizer with a device to cause con-traction of the stabilizer to said second, constrained, trans-verse dimension, inserting the contracted stabilizer into the bore; and disengaging the device to permit a release of the stabilizer from its contracted constraint.
According to a broad aspect of the present invention, there is provided a friction rock stabilizer for insertion in a bore formed in an earth structure for stabilizing the struc-ture. The stabilizer comprises a generally tubular body having an elongated axis and wall means for frictionally engaging the surface of an earth structure bore. The body further has a first, free, relaxed, transverse dimension predetermined to be larger than the transverse dimension of a bore into which it is to be inserted. The body also has an axially-extended slit formed through the wall means thereof to permit the body to assume a second, constrained, transverse dimension which is smaller than both the first transverse dimension and the trans-verse dimension of a bore into which it is to be inserted. The wall means as confronting axially-extended and spaced-apart sur-faces which: (1) define the slit therebetween, and (2) have key means formed adjacent the slit-defining surfaces for: (a) receiv-ing contraction forces thereat and (b) responsive to such forces,for moving the slit-defining surfaces toward each other.
~ ccording to a further broad aspect of the present invention, there is provided a method of inserting a friction rock stabilizer in a bore formed in an earth structure, for 3~ stabilizing the structure, wherein the bore has a given trans-verse dimension, and the stabilizer has a first, free, relaxed, transverse dimension which is greater than the given dimension and is resiliently contractible to a second, constrained, trans-~2~
verse dimension which is slightly less than the given dimension of the bore. The method comprises the steps of slidably engag-ing the stabilizer with a device to cause contraction of the stabilizer to the second, constrained, transverse dimension;
inserting the contracted stabilizer into the bore; and disengag-ing the device to permit a release of the stabilizer from its contracted constraint.
Further objects of this invention, as well as the novel features thereof, will become more apparent by reference to the following description, taken in conjunction with the accompanying figures in which Figure 1 is an isometric projection of an end portion of a friction rock stabilizer, according to an embodiment of the~in-vention, and a clamping device for use therewith, Figure 2 is a discontinuous isometric projection of the stabilizer and clamping device of Figure 1 shown in operative, engaged relationship, - Figure 3 is a discontinuous, elevational view of an alternative embodiment of a friction rock stabilizer, according to the invention, showing an alternative contracting tool in use therewith, and Figure 4 is a cross-sectional view taken along Section 4-4 of Figure 3.
According to the referenced U.S. Patent No. 3,922,867, an embodiment o~ a friction rock stabilizer may have an axially extended slit formed therein. Such a stabilizer 10 ~c',~
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is shown in Figures 1 and 2 and according to this inventive embodiment, has the edges 12 of the slit 14 thereof turned inward generally toward the central axis 16 thereof.
According to the invention, the stabilizer 10 is forceably contracted, to move confronting surfaces 18 thereof toward each other, and to dispose the edges 12 as bearing surfaces or keys.
Thus, the edges 12 slidably receive a clamping device 20. The device 20, of substantially U-shaped cross-section, has a flared or widened end 21 which has a width sufficient to straddle and slidably engage the edges 12 at one end of the stabilizer. Then, the device 20 is forced along the stabilizer 10, axially, to move the surfaces 18, into proximity, as aforesaid. The stab;lizer 10, then, being substantially closed along the slit 14, the edges 12 lie as closely-coupled, par-allel ribs. The device 20, slidably and axially engaged with the edges 12, functions as keyway to hold the "key" edges 12 in close coupling and, resultingly, the stabilizer 10 in con-tracted position. Now then, the stabilizer 10, for having a cross-sectional or transverse dimension slightly less than the earth structure bore in which to be installed, can be freely and slidably fitted therein. Upon the contracted stab-ilizer 10 being installed into the bore, it can be relaxed to return toward its free, transverse dimension. To accommodate for this, the contraction or clamping device 20 has an a aperture 22, formed through the lower end, which may be grasped by a tool. Simply by slidably withdrawing the device 20, it comes free of the stabilizer 10, and the latter expands outwardly to engage the bore wall.
In U.S. Patent ~o. 4,012,913, patentee Scott set forth an alternative embodiment of his friction rock stabilizer in which the edges of the slit therein are or may be overlapped.
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' ~Z~ 8 In Figures 3 and 4 I disclose an alternative embodiment lOa of a stabilizer according to the invention, drawn on the type of stabilizer depicted in said patent 4,012,913. Herein I
turn the edges 12a and 12b of the "overlapped" slit 14a in oppo-site directions so that the edges define parallel and confrontingribs~ Then by inserting a spacer blade 2~ therebetween, the rib-defining edges 12a and 12b are forced apart, resulting in a con-traction of the stabilizer lOa. ~gain, following earth structure bore insertion of the thereby contracted stabilizer lOa, it re-mains only to withdraw the blade 24, by means of the tool-aper-ture 22a, to allow the confronting edges 12a and 12b to close to-ward each other, so that the stabilizer lOa might return towards its free dimension.
Corrosive mine environments pose serious problems and, lS as a consequence, it is frequently deemed advisable to apply a corrosion-protective coating to the stabilizers 10 and lOa. How-ever, the prior art-practiced method of installing stabilizers into undersized bores, by applying the considerable and necessary thrusting force, destroys any stabilizer coatings. The wall of the bore simply scrapes off the coated surface. It is for this reason that my novel method of stabilizer insertion is particu-larly beneficial. The coated stabilizer is contracted to a di-mension of less than that of the bore, so that the bore will not have any significant, abrasive contact with the coating during stabilizer insertion. Then, the stabilizer is merely allowed to expand, and the coating closes into an undisturbed contact with the bsre wall.
To m~y attention has come Republic of South A-frica ~R.S.A.) patent specification Mo. 7~/5306 which has published in the RoS~A~ Patent Journal of August 1979.
5~
The R.S.A. specification recites a method of inserting a "friction roof bolt" in a hole in a roof or side wall of an underground opening for anchoring the roof or side wall, said bolt compris-ing a generally annular body from end-to-end having a slot through its ~hickness and being arranged to permit radial compression, wherein a hole is formed in the roof or side wall having a dia-meter which is smaller than that of said body when the body is in a noncompressed state, characterized by the steps of radially compressing said body to a diameter somewhat smaller than the diameter of the hole, fixing said body in the compressed state, inserting the compressed body in the hole, and causing the body to expand to engage the surrounding wall of the hole upon being inserted in the hole.
The aforesaid R.S.A. defines a method not too dissimilar to my inventive method which comprises inserting a friction rock stabilizer in a bore formed in an earth structure, for stabiliz-ing the structure, wherein the bore has a given transverse dimen-sion, and the stabilizer has a first, free, relaxed, transverse dimension which is greater than said given dimension and is resiliently contractible to a second, constrained, transverse dimension which is slightly less than said given dimension of said bore, comprising the steps of slidably engaging the stabi-lizer with a device to cause contraction of the stabilizer to said second, constrained, transverse dimension; inserting the contracted s~abilizer into the bore; and disengaging the device to permit a release of the stabilizer from its contracted con-straint.
The R.S.A. method and my own differ in at least one, material respect, however. My method comprises the slidable engagement of the stabilizer with a contracting device 20 and, ~ -6-., ' ~ . .
26~58 patently offers a facile method of contracting the bore-inserted stabilizer again, subsequently, for withdrawal there-of from a bore. It lS frequently desirable to remove a bore-inserted stabilizer to study the effects of corrosion, abra-sion etc. visited on the stabilizer. ~ence, my method owns this desirable reversibility. The R.S.A.-disclosed method comprises an irreversible stabilizer insertion as, in the embodiments thereof, it requires the severing of constraining bands following insertion. After the bands have been severed, no way is offered for again contracting the stabilizer to per-mit its removal from a bore.
While I have described my invention in connection with specific embodiments thereof, and methods of practice, 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 inYention as set forth in the objects thereof and in the appended claims.
. ~
This invention pertains to friction rock stabilizers, and methods for insertion of such in earth structure bores, and particularly to an improved friction rock stabilizer so configured as to facilitate its contraction to render its insertion into an undersized earth structure bore more facile, and to a method for insertion of friction rock stabilizers into undersized earth structure bores.
Friction rock stabilizers are relatively new earth struc-ture stabilizing devices, and such are best exemplified by U.S, Patent No. 3,922,867, issued December 2, 1975, and U.S.
Pater,t No. 4,012,913, issued March `22, 1977, both granted to James J, Scott, According to the teachings in the referenced Patents, friction rock stabilizers comprise generally tubular bodies which may be axially slit ! and which have a free cross-sectional dimension predetermined to be larger than the transVerse dimen-sion of the earth structure bores into which they are to be in-serted. Accordingly, it requires considerable thrusting ~orce to insert such a stabilizer into an undersized bore, The stabilizer must contract, to accommodate insertion, whereby the slit is substantially closed during lnsertion and, after insertion, the stabilizer attempts to rsturn to its original free dimension; thus it frictionally holds fast to the wall of the bore and, consequently, stabillzes the~earth structure.
It is an object of this invention to disclose both a fric-tion rock stabilizer having means formed thereon to facilitate a pre-insertion contraction thereof for contracted installa-tion in an u~dersized bore~ and also a method comprising the pre-insertion contraction, insertion, and contraction release 'riction roc]c stabilizers.
5~
Particularly, it is an object of this invention to se-t for-th a friction rock stabilizer for insertion in a bore formed in an earth structure for stabilizing the structure, comprising a generally tubular body, said body having an elongate axis and wall means for frictionally engaging the surface of an earth structure bore, said body further having a first, free, relaxed, transverse dimension predetermined to be larger than the transverse dimension of a bore into which it is to be in-serted; and said body also having an axially-extended slit formed through said wall means thereof to permit said body to assume a second, constrained, transverse dimension which is smaller than both said first transverse dimension and the transverse dimension of a bore into which it is to be inserted wherein said wall means has confronting axially-extended and spaced-apart surfaces which: (1) define said slit therebetween, and (2) have key means formed adjacent to said slit-defining surfaces for: (a) receiving contraction forces thereat9 and (b) responsive to such forces, for moving said slit-defining surfaces toward each other.
Another object of this invention is to set forth a friction rock stabilizer, for insertion in a bore formed in an earth structure for stabilizing the structure, comprising a generally tubular body, said body having an elongate, central axis and wall means for frictionally engaging the surface of an earth structure bore, said body also having means defining an axially-extended separation, of a given width9 in said wall means, and means defining a pair of spaced-apart bearing surfaces, integrally formed on said body and movable relative to each other to vary said separation to a width other than said given width.
_ _ l~Z6~5~3 It is also a further object of this invention to teach a method of inserting a friction rock stabilizer in a bore formed in an earth structure, for stabilizing the structure, wherein the bore has a given transverse dimension, and the stabilizer has a ~irst, free, relaxed, transverse dimension which is greater than said given dimension and is resiliently contractible to a second, constrained, transverse dimension which is slightly less than said given dimension of said bore, comprising the steps of slidably engaging the stabilizer with a device to cause con-traction of the stabilizer to said second, constrained, trans-verse dimension, inserting the contracted stabilizer into the bore; and disengaging the device to permit a release of the stabilizer from its contracted constraint.
According to a broad aspect of the present invention, there is provided a friction rock stabilizer for insertion in a bore formed in an earth structure for stabilizing the struc-ture. The stabilizer comprises a generally tubular body having an elongated axis and wall means for frictionally engaging the surface of an earth structure bore. The body further has a first, free, relaxed, transverse dimension predetermined to be larger than the transverse dimension of a bore into which it is to be inserted. The body also has an axially-extended slit formed through the wall means thereof to permit the body to assume a second, constrained, transverse dimension which is smaller than both the first transverse dimension and the trans-verse dimension of a bore into which it is to be inserted. The wall means as confronting axially-extended and spaced-apart sur-faces which: (1) define the slit therebetween, and (2) have key means formed adjacent the slit-defining surfaces for: (a) receiv-ing contraction forces thereat and (b) responsive to such forces,for moving the slit-defining surfaces toward each other.
~ ccording to a further broad aspect of the present invention, there is provided a method of inserting a friction rock stabilizer in a bore formed in an earth structure, for 3~ stabilizing the structure, wherein the bore has a given trans-verse dimension, and the stabilizer has a first, free, relaxed, transverse dimension which is greater than the given dimension and is resiliently contractible to a second, constrained, trans-~2~
verse dimension which is slightly less than the given dimension of the bore. The method comprises the steps of slidably engag-ing the stabilizer with a device to cause contraction of the stabilizer to the second, constrained, transverse dimension;
inserting the contracted stabilizer into the bore; and disengag-ing the device to permit a release of the stabilizer from its contracted constraint.
Further objects of this invention, as well as the novel features thereof, will become more apparent by reference to the following description, taken in conjunction with the accompanying figures in which Figure 1 is an isometric projection of an end portion of a friction rock stabilizer, according to an embodiment of the~in-vention, and a clamping device for use therewith, Figure 2 is a discontinuous isometric projection of the stabilizer and clamping device of Figure 1 shown in operative, engaged relationship, - Figure 3 is a discontinuous, elevational view of an alternative embodiment of a friction rock stabilizer, according to the invention, showing an alternative contracting tool in use therewith, and Figure 4 is a cross-sectional view taken along Section 4-4 of Figure 3.
According to the referenced U.S. Patent No. 3,922,867, an embodiment o~ a friction rock stabilizer may have an axially extended slit formed therein. Such a stabilizer 10 ~c',~
.., ,~
-3a-s~
is shown in Figures 1 and 2 and according to this inventive embodiment, has the edges 12 of the slit 14 thereof turned inward generally toward the central axis 16 thereof.
According to the invention, the stabilizer 10 is forceably contracted, to move confronting surfaces 18 thereof toward each other, and to dispose the edges 12 as bearing surfaces or keys.
Thus, the edges 12 slidably receive a clamping device 20. The device 20, of substantially U-shaped cross-section, has a flared or widened end 21 which has a width sufficient to straddle and slidably engage the edges 12 at one end of the stabilizer. Then, the device 20 is forced along the stabilizer 10, axially, to move the surfaces 18, into proximity, as aforesaid. The stab;lizer 10, then, being substantially closed along the slit 14, the edges 12 lie as closely-coupled, par-allel ribs. The device 20, slidably and axially engaged with the edges 12, functions as keyway to hold the "key" edges 12 in close coupling and, resultingly, the stabilizer 10 in con-tracted position. Now then, the stabilizer 10, for having a cross-sectional or transverse dimension slightly less than the earth structure bore in which to be installed, can be freely and slidably fitted therein. Upon the contracted stab-ilizer 10 being installed into the bore, it can be relaxed to return toward its free, transverse dimension. To accommodate for this, the contraction or clamping device 20 has an a aperture 22, formed through the lower end, which may be grasped by a tool. Simply by slidably withdrawing the device 20, it comes free of the stabilizer 10, and the latter expands outwardly to engage the bore wall.
In U.S. Patent ~o. 4,012,913, patentee Scott set forth an alternative embodiment of his friction rock stabilizer in which the edges of the slit therein are or may be overlapped.
.,..,~
.~ ,~
,';' ' .
' ~Z~ 8 In Figures 3 and 4 I disclose an alternative embodiment lOa of a stabilizer according to the invention, drawn on the type of stabilizer depicted in said patent 4,012,913. Herein I
turn the edges 12a and 12b of the "overlapped" slit 14a in oppo-site directions so that the edges define parallel and confrontingribs~ Then by inserting a spacer blade 2~ therebetween, the rib-defining edges 12a and 12b are forced apart, resulting in a con-traction of the stabilizer lOa. ~gain, following earth structure bore insertion of the thereby contracted stabilizer lOa, it re-mains only to withdraw the blade 24, by means of the tool-aper-ture 22a, to allow the confronting edges 12a and 12b to close to-ward each other, so that the stabilizer lOa might return towards its free dimension.
Corrosive mine environments pose serious problems and, lS as a consequence, it is frequently deemed advisable to apply a corrosion-protective coating to the stabilizers 10 and lOa. How-ever, the prior art-practiced method of installing stabilizers into undersized bores, by applying the considerable and necessary thrusting force, destroys any stabilizer coatings. The wall of the bore simply scrapes off the coated surface. It is for this reason that my novel method of stabilizer insertion is particu-larly beneficial. The coated stabilizer is contracted to a di-mension of less than that of the bore, so that the bore will not have any significant, abrasive contact with the coating during stabilizer insertion. Then, the stabilizer is merely allowed to expand, and the coating closes into an undisturbed contact with the bsre wall.
To m~y attention has come Republic of South A-frica ~R.S.A.) patent specification Mo. 7~/5306 which has published in the RoS~A~ Patent Journal of August 1979.
5~
The R.S.A. specification recites a method of inserting a "friction roof bolt" in a hole in a roof or side wall of an underground opening for anchoring the roof or side wall, said bolt compris-ing a generally annular body from end-to-end having a slot through its ~hickness and being arranged to permit radial compression, wherein a hole is formed in the roof or side wall having a dia-meter which is smaller than that of said body when the body is in a noncompressed state, characterized by the steps of radially compressing said body to a diameter somewhat smaller than the diameter of the hole, fixing said body in the compressed state, inserting the compressed body in the hole, and causing the body to expand to engage the surrounding wall of the hole upon being inserted in the hole.
The aforesaid R.S.A. defines a method not too dissimilar to my inventive method which comprises inserting a friction rock stabilizer in a bore formed in an earth structure, for stabiliz-ing the structure, wherein the bore has a given transverse dimen-sion, and the stabilizer has a first, free, relaxed, transverse dimension which is greater than said given dimension and is resiliently contractible to a second, constrained, transverse dimension which is slightly less than said given dimension of said bore, comprising the steps of slidably engaging the stabi-lizer with a device to cause contraction of the stabilizer to said second, constrained, transverse dimension; inserting the contracted s~abilizer into the bore; and disengaging the device to permit a release of the stabilizer from its contracted con-straint.
The R.S.A. method and my own differ in at least one, material respect, however. My method comprises the slidable engagement of the stabilizer with a contracting device 20 and, ~ -6-., ' ~ . .
26~58 patently offers a facile method of contracting the bore-inserted stabilizer again, subsequently, for withdrawal there-of from a bore. It lS frequently desirable to remove a bore-inserted stabilizer to study the effects of corrosion, abra-sion etc. visited on the stabilizer. ~ence, my method owns this desirable reversibility. The R.S.A.-disclosed method comprises an irreversible stabilizer insertion as, in the embodiments thereof, it requires the severing of constraining bands following insertion. After the bands have been severed, no way is offered for again contracting the stabilizer to per-mit its removal from a bore.
While I have described my invention in connection with specific embodiments thereof, and methods of practice, 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 inYention as set forth in the objects thereof and in the appended claims.
Claims (17)
1. A friction rock stabilizer, for insertion in a bore formed in an earth structure for stabilizing the structure, comprising:
a generally tubular body, said body having an elongate axis and wall means for frictionally engaging the surface of an earth structure bore;
said body further having a first, free, relaxed, transverse dimension predetermined to be larger than the trans-verse dimension of a bore into which it is to be inserted; and said body also having an axially-extended slit formed through said wall means thereof to permit said body to assume a second, constrained, transverse dimension which is smaller than both said first transverse dimension and the transverse dimension of a bore into which it is to be inserted, wherein said wall means has confronting axially-extended and spaced-apart surfaces which: (1) define said slit therebetween, and (2) have key means formed adjacent to said slit-defining surfaces for: (a) receiving contraction forces thereat, and (b) responsive to such forces, for moving said slit-defining surfaces toward each other.
a generally tubular body, said body having an elongate axis and wall means for frictionally engaging the surface of an earth structure bore;
said body further having a first, free, relaxed, transverse dimension predetermined to be larger than the trans-verse dimension of a bore into which it is to be inserted; and said body also having an axially-extended slit formed through said wall means thereof to permit said body to assume a second, constrained, transverse dimension which is smaller than both said first transverse dimension and the transverse dimension of a bore into which it is to be inserted, wherein said wall means has confronting axially-extended and spaced-apart surfaces which: (1) define said slit therebetween, and (2) have key means formed adjacent to said slit-defining surfaces for: (a) receiving contraction forces thereat, and (b) responsive to such forces, for moving said slit-defining surfaces toward each other.
2. A friction rock stabilizer, according to claim 1, wherein:
said key means comprises axially-extended, substantially parallel ribs.
said key means comprises axially-extended, substantially parallel ribs.
3. A friction rock stabilizer, according to claim 2, wherein:
said ribs project substantially radially, relative to said elongate axis.
said ribs project substantially radially, relative to said elongate axis.
4. A friction rock stabilizer, according to claim 3, wherein:
said ribs project inwardly, relative to said body, from said edges.
said ribs project inwardly, relative to said body, from said edges.
5. A friction rock stabilizer, according to claim 1, further including:
clamping means, slidably and removably engaged with said wall means, constraining said body in contraction, whereby said body manifests said second, constrained dimension.
clamping means, slidably and removably engaged with said wall means, constraining said body in contraction, whereby said body manifests said second, constrained dimension.
6. A friction rock stabilizer, according to claim 5, wherein:
said clamping means comprises keyway means slidably engaged with said key means.
said clamping means comprises keyway means slidably engaged with said key means.
7. A friction rock stabilizer, for insertion in a bore formed in an earth structure for stabilizing the structure, comprising:
a generally tubular body, said body having an elongate, central axis and wall means for frictionally engaging the surface of an earth structure bore;
said body also having means defining an axially-extended separation, of a given width, in said wall means, and means defining a pair of spaced-apart bearing surfaces, integrally formed on said body and movable relative to each other to vary said separation to a width other than said given width.
a generally tubular body, said body having an elongate, central axis and wall means for frictionally engaging the surface of an earth structure bore;
said body also having means defining an axially-extended separation, of a given width, in said wall means, and means defining a pair of spaced-apart bearing surfaces, integrally formed on said body and movable relative to each other to vary said separation to a width other than said given width.
8. A friction rock stabilizer, according to claim 7, wherein:
said bearing surfaces comprise axially-extended edges of said wall means.
said bearing surfaces comprise axially-extended edges of said wall means.
9. A friction rock stabilizer, according to claim 8, wherein:
said edges are infolded and oriented substantially toward said central axis.
said edges are infolded and oriented substantially toward said central axis.
10. A friction rock stabilizer, according to claim 7, further including:
clamping means, slidably engaged with said edges, for holding said edges in relatively close proximity.
clamping means, slidably engaged with said edges, for holding said edges in relatively close proximity.
11. A friction rock stabilizer, according to claim 10, wherein:
said clamping means comprises an elongate element, said element being substantially U-shaped in cross-section.
said clamping means comprises an elongate element, said element being substantially U-shaped in cross-section.
12. A method of inserting a friction rock stabilizer in a bore formed in an earth structure, for stabilizing the structure, wherein the bore has a given transverse dimension, and the stabilizer has a first, free, relaxed, transverse dimension which is greater than said given dimension and is resiliently contractible to a second, constrained, transverse dimension which is slightly less than said given dimension of said bore, comprising the steps of:
slidably engaging the stabilizer with a device to cause contraction of the stabilizer to said second, constrained, transverse dimension, inserting the contracted stabilizer into the bore;
and disengaging the device to permit a release of the stabilizer from its contracted constraint.
slidably engaging the stabilizer with a device to cause contraction of the stabilizer to said second, constrained, transverse dimension, inserting the contracted stabilizer into the bore;
and disengaging the device to permit a release of the stabilizer from its contracted constraint.
13. A method, according to claim 12, wherein:
said contracting step comprises engaging the stabilizer with a clamping device to cause contraction thereof.
said contracting step comprises engaging the stabilizer with a clamping device to cause contraction thereof.
14. A method, according to claim 13, wherein:
said engaged step comprises engaging freely spaced-apart surfaces of the stabilizer, and forceably moving said surfaces into a constrained proximity to each other.
said engaged step comprises engaging freely spaced-apart surfaces of the stabilizer, and forceably moving said surfaces into a constrained proximity to each other.
15. A method, according to claim 13, further including the step of:
forming a pair of spaced-apart bearing surfaces on said stabilizer; and wherein said engaging step comprises forceably clamping said bearing surfaces into a constrained proximity.
forming a pair of spaced-apart bearing surfaces on said stabilizer; and wherein said engaging step comprises forceably clamping said bearing surfaces into a constrained proximity.
16. A method, according to claim 15, further including the step of:
forming said stabilizer with an axially-extended separation of a given width, and said forming step comprises forming said bearing surfaces on opposite sides of said separation.
forming said stabilizer with an axially-extended separation of a given width, and said forming step comprises forming said bearing surfaces on opposite sides of said separation.
17. A method of inserting a friction rock stabilizer in a bore formed in an earth structure, for stabilizing the structure, wherein the bore has a given transverse dimension, and the stabilizer has a first, free, relaxed, transverse dimension which is greater than said given dimension and is resiliently contractible to a second, constrained, transverse dimension which is slightly less than said given dimension of said bore, comprising the steps of:
contracting the stabilizer to said second, con-strained, transverse dimension;
slidably engaging the stabilizer with a device to retain the stabilizer contracted in said second dimension;
inserting the stabilizer into the bore, and disengaging the device from the stabilizer to permit the latter to expand from said second dimension toward said first dimension.
contracting the stabilizer to said second, con-strained, transverse dimension;
slidably engaging the stabilizer with a device to retain the stabilizer contracted in said second dimension;
inserting the stabilizer into the bore, and disengaging the device from the stabilizer to permit the latter to expand from said second dimension toward said first dimension.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA371,890A CA1126058A (en) | 1981-02-27 | 1981-02-27 | Friction rock stabilizer and method for insertion thereof in an earth structure bore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA371,890A CA1126058A (en) | 1981-02-27 | 1981-02-27 | Friction rock stabilizer and method for insertion thereof in an earth structure bore |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1126058A true CA1126058A (en) | 1982-06-22 |
Family
ID=4119322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA371,890A Expired CA1126058A (en) | 1981-02-27 | 1981-02-27 | Friction rock stabilizer and method for insertion thereof in an earth structure bore |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1126058A (en) |
-
1981
- 1981-02-27 CA CA371,890A patent/CA1126058A/en not_active Expired
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