CN102086770B - Cone resistive friction sleeve large-deformation anchor rod - Google Patents
Cone resistive friction sleeve large-deformation anchor rod Download PDFInfo
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- CN102086770B CN102086770B CN 201110061303 CN201110061303A CN102086770B CN 102086770 B CN102086770 B CN 102086770B CN 201110061303 CN201110061303 CN 201110061303 CN 201110061303 A CN201110061303 A CN 201110061303A CN 102086770 B CN102086770 B CN 102086770B
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- 238000000034 method Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 7
- 239000011435 rock Substances 0.000 abstract description 41
- 230000008093 supporting effect Effects 0.000 abstract description 19
- 239000002689 soil Substances 0.000 abstract description 4
- 238000004873 anchoring Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000006073 displacement reaction Methods 0.000 description 7
- 230000004888 barrier function Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 241000270295 Serpentes Species 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Abstract
The invention belongs to the field of geotechnical engineering anchoring, and relates to a supporting structure of a large-deformation rock-soil body, in particular relates to an anchor rod. The anchor rod comprises an external nut (2), a base plate (3), a cone-type-tooth friction body (5), a friction sleeve (6) and a rod body (8), and is characterized in that the inner wall of the friction sleeve (6) is provided with a plurality of sleeve friction grooves (62) along a longitudinal direction; and the cone-type-tooth friction body (5) is arranged on the rod body (8). The anchor rod provided by the invention has the beneficial effects that large deformation of surrounding rock can be automatically adapted so as to automatically extend, and simultaneously the deformation energy of the surrounding rock can be absorbed in the deforming process, thus ensuring the supporting effects of the supporting structure.
Description
Technical field
The present invention relates to a kind of supporting and protection structure of large deformation Rock And Soil in geotechnical engineering anchoring field, relates in particular to a kind of anchor pole.
Background technology
Carry out roadway construction in weak surrounding rock, the often country rock of facing is to the large deformation of roadway convergence, in this case, if the initial stage is namely adopted the very large supporting of rigidity, supporting and protection structure can very fast damage under the pressure from surrounding rock effect, has both wasted manpower and materials, again the non-support effect.The people such as Liu Quansheng point out in (rock mechanics the 10th phase in 2010) at literary composition " colliery deep tunnel broken surrounding rock Nonlinear Large Deformation and Measures for Supporting research ": the organizational styucture of deep rock mass, basic act feature and engineering response are compared with the superficial part rock mass essence variation have all been occured, be embodied as the country rock that shows as hard and steady at superficial part, generally all show significant soft rock feature in the deep, the various supporting and protection structure of employing and support pattern also will adapt to the large deformation of this weak surrounding rock.The people such as Lu Chunchang are at literary composition " technical research and the application of Water expanding pipe drill rod in weak, large deformation country rock roadway opening " in (mining safety and environmental protection the 6th phase in 2009), a kind of Water expanding pipe drill rod is proposed, in order to the roadway with large deformation country rock is carried out supporting, supporting effect is obvious.The people such as Li You proposed with a kind of band large deformation anchor rod that cracks the large deformation soft rock to be carried out supporting in literary composition " a kind of novel Extendable anchor rod that is applicable to Large Deformation Support " (Central-South highway engineering the 2nd phase in 2007), had improved supporting effect.Above-mentioned document shows, to the supporting of large deformation weak surrounding rock, should adopt flexible support, allows surrouding rock deformation first under controlled condition, makes country rock release portion deformation energy, brings into play simultaneously the self-supporting ability of country rock.
For solving the supporting problem of large deformation soft rock, just require to produce larger elongation strain with the large deformation of suitable for surrounding rock as the anchor pole of preliminary bracing, so some large deformation anchor rods occurred.As being to disclose a kind of constant resistance and large deformation anchor rod in 201010196197.2 the application in the patent No., but the perfect thread connected mode of its permanent resistance install and the body of rod is unfavorable for effectively realizing the dual purpose of constant-resistance and large deformation; A kind of snake type telescopic anchoring-bolt is disclosed in the patent No. is 88204483.4 application, but its snakelike section in deformation process axially pulling force increase in proportion the further distortion of restriction country rock.In a word, existing traditional anchor pole elongation per unit length is low, can not satisfy the requirement of large deformation country rock; Existing large deformation anchor rod constant-resistance effect is not satisfactory, is unfavorable for applying in Practical Project.
Summary of the invention
The object of the present invention is to provide a kind of cone resistance formula friction sleeve large deformation anchor rod, overcome the problem that elongation per unit length is low, supporting effect is poor that existing traditional anchor pole exists, overcome simultaneously the existing not satisfactory problem of large deformation anchor rod constant-resistance effect.
For achieving the above object, technical scheme of the present invention is as follows:
A kind of cone resistance formula friction sleeve large deformation anchor rod, comprise outer nut (2), backing plate (3), cone tooth friction piece (5), friction sleeve (6), the body of rod (8), it is characterized in that: longitudinally be provided with a plurality of sleeve frictional grooves (62) on the inwall of described friction sleeve (6), the body of rod (8) is provided with cone tooth friction piece (5).
Technique scheme can further be improved to: described outer nut (2) and backing plate (3) are sleeved on the afterbody of friction sleeve (6) successively.
Technique scheme can further be improved to: described outer nut (2) and backing plate (3) are sleeved on the afterbody of the body of rod (8) successively.
Technique scheme can further be improved to: described cone tooth friction piece (5) cross section is butterfly shape, the longitudinal pitch that length is arranged along described friction sleeve (6) greater than sleeve frictional groove (62), cone tooth (51) is established on described cone tooth friction piece (5) surface, described cone tooth (51) section is trapezoidal or other shape, be evenly arranged along cone tooth friction piece (5) girth, its quantity equates with the sleeve frictional groove (62) of single section;
Described sleeve frictional groove (62) is evenly arranged by section, and every section is established 2 ~ 8, and the minimum vertical clear distance in sleeve frictional groove (62) cross section is less than the width of cone tooth (51) crown.
Technique scheme can further be improved to: described sleeve frictional groove (62) is double triangle, double square or double trapezoid along described friction sleeve (6) along horizontal profile.
Technique scheme can further be improved to: an end of described friction sleeve (6) arranges tail seal plug (1), and the other end arranges head seal plug (7).
Technique scheme can further be improved to: backing plate (3) is dish or flat shape.
Technique scheme can further be improved to: also comprise a stopper (63), described stopper (63) is annular, is arranged in the inner surface of described friction sleeve (6), and the internal diameter of described stopper (63) is slightly larger than the diameter of the body of rod (8).
Technique scheme can further be improved to: described cone tooth friction piece (5) is arranged on the afterbody of the body of rod (8), is threaded with the described body of rod (8) afterbody by described inner nut (4), or directly processes at the described body of rod (8) afterbody.
Technique scheme can further be improved to: described cone tooth friction piece (5) is arranged on the head of the body of rod (8), is threaded with the described body of rod (8) head by described inner nut (4), or directly processes at the described body of rod (8) head.
Beneficial effect of the present invention is: the automatically large deformation of suitable for surrounding rock and automatically extending can absorb the deformation energy of country rock simultaneously, thereby guarantee its supporting effect in deformation process.
Description of drawings
Fig. 1 is structural representation one of the present invention.
Fig. 2 is structural representation two of the present invention.
Fig. 3 is the a-a sectional drawing.
Fig. 4 is the b-b sectional drawing.
Fig. 5 is the c-c sectional drawing.
Fig. 6 is the d-d sectional drawing.
Fig. 7 is drawing in side sectional elevation and the axonometric drawing of cone tooth friction piece.
Fig. 8 is the structural representation of the preferred embodiment of the present invention.
Fig. 9 is the structural representation of the preferred embodiment of the present invention.
1-tail seal plug 2-outer nut 3-backing plate 4-inner nut
The 5-cone tooth friction piece 6-friction sleeve 7-head seal plug 8-body of rod
9-stopper preformed hole 31-backing plate preformed hole 51-cone tooth 61-friction sleeve tailing screw flight
62-sleeve frictional groove 63-stopper 81-body of rod tailing screw flight
The specific embodiment
The present invention will be further described below in conjunction with accompanying drawing.
As shown in Figure 1, the present invention includes outer nut 2, inner nut 4, backing plate 3, cone tooth friction piece 5, friction sleeve 6, the body of rod 8 etc.Backing plate 3 and outer nut 2 are connected to the afterbody of friction sleeve 6 in turn, wherein the pars intermedia of backing plate 3 sets up a preformed hole 31 separately, pass for friction sleeve 6, outer nut 2 is connected in friction sleeve 6 by screw thread 61, the length range of friction sleeve 6 is 10cm ~ 150cm, can determine according to the permission displacement size of country rock.
In order to realize large deformation performance of the present invention, the inner surface of friction sleeve 6 is provided with sleeve frictional groove 62, sleeve frictional groove 62 is double triangle, double square or double trapezoid (being double trapezoid among Fig. 3) along horizontal profile, be evenly arranged by section, every section is established 2 ~ 8 (among Fig. 4, Fig. 5 being 4), axial spacing along friction sleeve 6 is 5 ~ 30cm, the minimum vertical clear distance in sleeve frictional groove 62 cross sections can interact when relative displacement occurs to guarantee both less than the width of cone tooth 51 crowns.
The body of rod 8 is provided with cone tooth friction piece 5, preferably be arranged on the afterbody of the body of rod 8, also can be arranged on other position of the body of rod 8, the longitudinal pitch that cone tooth friction piece 5 length are arranged along friction sleeve 6 greater than sleeve frictional groove 62, thereby the continuity of 62 pairs of cones of realization sleeve frictional groove tooth friction piece, 5 barrier force.Cone tooth friction piece 5 can be sleeved on the body of rod 8 afterbodys by inner nut 4, and this moment, the body of rod 8 afterbody external surfaces were provided with the screw thread 81 that mates with inner nut 4; Cone tooth friction piece 5 also can directly be processed at the afterbody of the body of rod 8 and save inner nut 4 and screw thread 81.Cone tooth 51 is established on the surface of cone tooth friction piece 5, cone tooth 51 cross sections are trapezoidal or other shape (being trapezoidal among Fig. 7), be evenly arranged along cone tooth friction piece 5 peripheries, its quantity equates (being 4 among Fig. 4, Fig. 5, Fig. 7) with the sleeve frictional groove 62 of single section, cone tooth 51 is isometric with cone tooth friction piece 5.
The width of cone tooth 51 crowns according to stressing conditions of the present invention, can change its vertical clearance greater than the minimum vertical clear distance in sleeve frictional groove 62 cross sections by the width of adjusting sleeve frictional groove 62.When requiring the anchor pole bearing capacity larger, reduce the vertical clearance of sleeve frictional groove 62; When requiring the anchor pole bearing capacity hour, increase the vertical clearance of sleeve frictional groove 62; Adjustment by sleeve frictional groove 62 vertical clearances adapts to different pressures from surrounding rock.
The axial tension that is subject to as the present invention is during less than the barrier force of 62 pairs of cones of sleeve frictional groove tooth friction piece 5, and friction sleeve 6 and cone tooth friction piece 5, the body of rod 8 are in relative static conditions; Relative displacement will occur between friction sleeve 6 and cone tooth friction piece 5, the body of rod 8 during greater than the barrier force of 62 pairs of cones of sleeve frictional groove tooth friction piece 5 in the axial tension that is subject to as the present invention.Along with the increase of displacement, the lateral elasticity distortion at first occurs in sleeve frictional groove 62, and then produces plastic failure to a certain degree.The simultaneously distortion of country rock increases gradually; pressure from surrounding rock can reduce usually gradually; when axial tension is decreased to frictional force between sleeve frictional groove 62 and the cone tooth friction piece 5, will no longer relative displacement occur between friction sleeve 6 and the cone tooth friction piece 5 and remain static.When cone tooth friction piece 5 is about to slip away a sleeve frictional groove 62 section, will organize sleeve frictional groove 62 with next and contact, thus the continuity of realization barrier force.Cone tooth friction piece 5 can be arranged on the afterbody of the body of rod 8, also can be arranged on other positions of the body of rod 8.
In order to limit the maximum distortion of country rock, make it be no more than the length of friction sleeve 6, inner surface handicapping block 63 at friction sleeve 6 heads, preformed hole 9 is established at the center of stopper 63, the slightly larger in diameter of preformed hole 9 is established in the diameter of the body of rod 8 in the center, thereby guarantees that cone tooth friction piece 5 does not break away from friction sleeve 6.When cone tooth friction piece 5 contacts with stopper 63, the present invention will no longer extend, and pulling capacity rises until the strength limit of the body of rod 8.
For preventing that Rock And Soil and moisture engaging friction sleeve 6 inside from causing internal construction generation corrosion, destruction, establish respectively tail seal plug 1 and head seal plug 7 at the two ends of friction sleeve 6, thereby guarantee that friction sleeve 6 inside are in air-tight state.
Figure 2 shows that structural representation two of the present invention, with structural representation one a little difference is only arranged.Cone tooth friction piece 5 directly processing is equivalent to affixedly at the afterbody of the body of rod 8, does not need inner nut 4 and screw thread 81 at this moment.
Figure 3 shows that the a-a sectional drawing.Each sleeve frictional groove 62 is comprised of two friction teeth, sleeve frictional groove 62 is double trapezoid along horizontal profile, also can be double triangle or double square, the axial spacing of edge friction sleeve 6 is 5 ~ 30cm, and the length of cone tooth friction piece 5 is greater than the axial spacing of sleeve frictional groove 62 along friction sleeves 6.
Figure 4 shows that the b-b sectional drawing.Along with the increase of cone tooth friction piece 5 with 62 relative displacements of sleeve frictional groove, interaction has occured with sleeve frictional groove 62 in cone tooth 51, and 62 pairs of cones of sleeve frictional groove tooth friction piece 5 has produced barrier force.
Figure 5 shows that the c-c sectional drawing.When cone tooth friction piece 5 moved to sleeve frictional groove 62, originally cone tooth 51 did not contact with sleeve frictional groove 62, is easy to bore tooth 51 and slips in the sleeve frictional groove 62.
Figure 6 shows that the d-d sectional drawing.Stopper 63 is fixed on the inboard of friction sleeve 6, and the cross section is annular, and preformed hole 9 is established at stopper 63 centers, and the slightly larger in diameter of preformed hole 9 is established in the diameter of the body of rod 8 in the center.
Figure 7 shows that drawing in side sectional elevation and the axonometric drawing of cone tooth friction piece 5.Cone tooth friction piece 5 cross sections are butterfly shape, and cone tooth 51 cross sections are trapezoidal, also can be other shape.Cone tooth 51 quantity are 2 ~ 8, are 4 among Fig. 7, and cone tooth 51 is isometric with cone tooth friction piece 5.
Fig. 8, Figure 9 shows that the structural representation of other two kinds of preferred embodiments of the present invention.That is: outer nut 2 and backing plate 3 are sleeved on the afterbody of the body of rod 8 successively, and cone tooth friction piece 5 directly processing is equivalent to affixed at the head of the body of rod 8; And cone tooth friction piece 5 can be sleeved on the body of rod 8 heads by inner nut 4, and this moment, the body of rod 8 head external surfaces were provided with the screw thread 81 with inner nut 4 couplings.
The present invention is when interacting with country rock, and both deformation controlling for rock surrounding gateways allowed again surrouding rock deformation, distortion along with country rock, Automatic-drawing of the present invention and provide lasting supporting power to country rock, thus realize the stable of Rock And Soil, eliminated the potential safety hazards such as roof fall, landslide, rock burst.
The present invention provides lasting supporting power to the large deformation country rock, applicable to departments such as building, water conservancy, mining industry, highway, railways by the interaction of friction sleeve 6 with cone tooth friction piece 5.The present invention is simple in structure, and is easy to make, cheap.
Claims (8)
1. bore resistance formula friction sleeve large deformation anchor rod for one kind, comprise outer nut (2), backing plate (3), cone tooth friction piece (5), friction sleeve (6), the body of rod (8), it is characterized in that: longitudinally be provided with a plurality of sleeve frictional grooves (62) on the inwall of described friction sleeve (6), the body of rod (8) is provided with cone tooth friction piece (5); Described cone tooth friction piece (5) cross section is butterfly shape, the longitudinal pitch that length is arranged along described friction sleeve (6) greater than sleeve frictional groove (62), cone tooth (51) is established on described cone tooth friction piece (5) surface, described cone tooth (51) section is trapezoidal, be evenly arranged along cone tooth friction piece (5) girth, its quantity equates with the sleeve frictional groove (62) of single section;
Described sleeve frictional groove (62) is evenly arranged by section, and every section is established 2 ~ 8, and the minimum vertical clear distance in sleeve frictional groove (62) cross section is less than the width of cone tooth (51) crown; Described outer nut (2) and backing plate (3) are sleeved on the afterbody of friction sleeve (6) successively.
2. bore resistance formula friction sleeve large deformation anchor rod for one kind, comprise outer nut (2), backing plate (3), cone tooth friction piece (5), friction sleeve (6), the body of rod (8), it is characterized in that: longitudinally be provided with a plurality of sleeve frictional grooves (62) on the inwall of described friction sleeve (6), the body of rod (8) is provided with cone tooth friction piece (5); Described cone tooth friction piece (5) cross section is butterfly shape, the longitudinal pitch that length is arranged along described friction sleeve (6) greater than sleeve frictional groove (62), cone tooth (51) is established on described cone tooth friction piece (5) surface, described cone tooth (51) section is trapezoidal, be evenly arranged along cone tooth friction piece (5) girth, its quantity equates with the sleeve frictional groove (62) of single section;
Described sleeve frictional groove (62) is evenly arranged by section, and every section is established 2 ~ 8, and the minimum vertical clear distance in sleeve frictional groove (62) cross section is less than the width of cone tooth (51) crown; Described outer nut (2) and backing plate (3) are sleeved on the afterbody of the body of rod (8) successively.
3. a kind of cone resistance formula friction sleeve large deformation anchor rod according to claim 1, it is characterized in that: described sleeve frictional groove (62) is double triangle, double square or double trapezoid along described friction sleeve (6) along horizontal profile.
4. a kind of cone resistance formula friction sleeve large deformation anchor rod as claimed in claim 1, it is characterized in that: an end of described friction sleeve (6) arranges tail seal plug (1), and the other end arranges head seal plug (7).
5. a kind of cone resistance formula friction sleeve large deformation anchor rod as claimed in claim 1, it is characterized in that: backing plate (3) is dish or flat shape.
6. a kind of cone resistance formula friction sleeve large deformation anchor rod according to claim 1, it is characterized in that: also comprise a stopper (63), described stopper (63) is annular, be arranged in the inner surface of described friction sleeve (6), the internal diameter of described stopper (63) is slightly larger than the diameter of the body of rod (8).
7. a kind of cone resistance formula friction sleeve large deformation anchor rod according to claim 1, it is characterized in that: described cone tooth friction piece (5) is arranged on the afterbody of the body of rod (8), be threaded with the described body of rod (8) afterbody by inner nut (4), or directly process at the described body of rod (8) afterbody.
8. a kind of cone resistance formula friction sleeve large deformation anchor rod according to claim 2, it is characterized in that: described cone tooth friction piece (5) is arranged on the head of the body of rod (8), be threaded with the described body of rod (8) head by inner nut (4), or directly process at the described body of rod (8) head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110061303 CN102086770B (en) | 2011-03-15 | 2011-03-15 | Cone resistive friction sleeve large-deformation anchor rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110061303 CN102086770B (en) | 2011-03-15 | 2011-03-15 | Cone resistive friction sleeve large-deformation anchor rod |
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| Publication Number | Publication Date |
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| CN102086770A CN102086770A (en) | 2011-06-08 |
| CN102086770B true CN102086770B (en) | 2013-04-03 |
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| CN 201110061303 Expired - Fee Related CN102086770B (en) | 2011-03-15 | 2011-03-15 | Cone resistive friction sleeve large-deformation anchor rod |
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| CN102359386A (en) * | 2011-10-28 | 2012-02-22 | 湖南科技大学 | Shearing sleeve type yielding bolt |
| CN102434180A (en) * | 2011-11-18 | 2012-05-02 | 山东科技大学 | Continuous resistance-increasing deforming anchor rod |
| CN104373145B (en) * | 2014-11-04 | 2016-08-17 | 中国矿业大学 | Embedded classification constant-resistance shearing resistance large deformation anchor and method |
| CN104594931A (en) * | 2015-01-30 | 2015-05-06 | 湖南科技大学 | Periodically resistance-increased and pressure-yielded anti-impact anchor rod |
| CN105422152B (en) * | 2015-12-28 | 2018-05-08 | 山东科技大学 | A kind of large deformation shear anchor arm and its installation method |
| CN108442956A (en) * | 2018-05-14 | 2018-08-24 | 重庆大学 | A kind of adaptive compression shear formula anchor pole |
| CN108442955A (en) * | 2018-05-14 | 2018-08-24 | 重庆大学 | A kind of adaptive friction formula anchor pole |
| CN109339840B (en) * | 2018-11-13 | 2024-03-05 | 重庆大学 | Anti-torsion large-deformation anchor rod |
| CN109339842B (en) * | 2018-11-13 | 2024-02-20 | 重庆大学 | Liquid metal sensor and large-deformation anchor rod using same for monitoring and early warning |
| CN112648332A (en) * | 2020-12-03 | 2021-04-13 | 北京科技大学 | Spherical cell hole ladder-shaped deformation ore pressure controller and method |
| CN114542144B (en) * | 2022-02-22 | 2023-02-03 | 中国矿业大学 | Broken surrounding rock enlarged type end anchoring multi-stage yielding constant-resistance large-deformation anchor rod and method |
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| GB1365467A (en) * | 1972-04-13 | 1974-09-04 | Sikstrom K B | Expansion bolt |
| DE3510997C1 (en) * | 1985-03-27 | 1986-06-05 | Ruhrkohle Ag, 4300 Essen | Yielding roof bolt |
| CN87200415U (en) * | 1987-01-10 | 1987-11-25 | 中南工业大学 | Recoverable pipe cone type anchor stem |
| SU1507985A1 (en) * | 1987-12-30 | 1989-09-15 | Донецкий Научно-Исследовательский Угольный Институт | Yieldable roof bolt |
| CN2216590Y (en) * | 1994-12-06 | 1996-01-03 | 于永宏 | Anchoring-bolt |
| CN201753609U (en) * | 2009-12-18 | 2011-03-02 | 张向阳 | Yielding anchor cable device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202228096U (en) * | 2011-03-15 | 2012-05-23 | 北京科技大学 | Conical-blocking type friction sleeve large-deformation anchor rod |
-
2011
- 2011-03-15 CN CN 201110061303 patent/CN102086770B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1365467A (en) * | 1972-04-13 | 1974-09-04 | Sikstrom K B | Expansion bolt |
| DE3510997C1 (en) * | 1985-03-27 | 1986-06-05 | Ruhrkohle Ag, 4300 Essen | Yielding roof bolt |
| CN87200415U (en) * | 1987-01-10 | 1987-11-25 | 中南工业大学 | Recoverable pipe cone type anchor stem |
| SU1507985A1 (en) * | 1987-12-30 | 1989-09-15 | Донецкий Научно-Исследовательский Угольный Институт | Yieldable roof bolt |
| CN2216590Y (en) * | 1994-12-06 | 1996-01-03 | 于永宏 | Anchoring-bolt |
| CN201753609U (en) * | 2009-12-18 | 2011-03-02 | 张向阳 | Yielding anchor cable device |
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| CN102086770A (en) | 2011-06-08 |
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