CN102086770A - Cone resistive friction sleeve large-deformation anchor rod - Google Patents
Cone resistive friction sleeve large-deformation anchor rod Download PDFInfo
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- CN102086770A CN102086770A CN2011100613030A CN201110061303A CN102086770A CN 102086770 A CN102086770 A CN 102086770A CN 2011100613030 A CN2011100613030 A CN 2011100613030A CN 201110061303 A CN201110061303 A CN 201110061303A CN 102086770 A CN102086770 A CN 102086770A
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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 38
- 230000008093 supporting effect Effects 0.000 abstract description 20
- 238000004873 anchoring Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000002689 soil Substances 0.000 abstract 1
- 238000006073 displacement reaction Methods 0.000 description 7
- 230000004888 barrier function Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 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
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
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Technical field
The present invention relates to a kind of supporting and protection structure of large deformation geotechnical body 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 country rock of facing often is to the large deformation of tunnel convergence, in this case, if the initial stage is promptly adopted the very big 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.People such as Liu Quansheng point out in (2010 the 10th phases of rock mechanics) at literary composition " colliery deep tunnel break non-linear large deformation of country rock and supporting countermeasure ": 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 taken place, 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.People such as Lu Chunchang are at literary composition " technical research and the application of hydraulic expansion type pipe anchor pole in weak, large deformation country rock roadway opening " in (2009 the 6th phases of mining safety and environmental protection), a kind of hydraulic expansion type pipe anchor pole is proposed, in order to the roadway with large deformation country rock is carried out supporting, supporting effect is obvious.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 extending anchor pole that is applicable to the large deformation supporting " (2007 the 2nd phases of Central-South highway engineering), 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 earlier under controlled condition, makes country rock release portion deformation energy, brings into play the self-supporting ability of country rock simultaneously.
For solving the supporting problem of large deformation soft rock, just require to produce the large deformation of bigger elongation strain, so some large deformation anchor rods occurred with suitable for surrounding rock as the anchor pole of preliminary bracing.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 constant-resistance device and the body of rod is unfavorable for effectively realizing the dual purpose of constant-resistance and large deformation; A kind of snakelike extending anchor pole is disclosed in the patent No. is 88204483.4 application, but its snakelike section in deformation process axially pulling force increase the further distortion of restriction country rock in proportion.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 actual engineering.
Summary of the invention
The object of the present invention is to provide a kind of awl resistance formula friction sleeve large deformation anchor rod, the elongation per unit length that overcomes existing traditional anchor pole existence is low, the problem of supporting effect difference, overcomes the existing not satisfactory problem of large deformation anchor rod constant-resistance effect simultaneously.
For achieving the above object, technical scheme of the present invention is as follows:
A kind of awl resistance formula friction sleeve large deformation anchor rod, comprise outer nut (2), backing plate (3), awl 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 awl 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 awl 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), awl tooth (51) is established on described awl tooth friction piece (5) surface, described awl tooth (51) section is trapezoidal or other shape, arrange evenly that along awl tooth friction piece (5) girth its quantity equates with the sleeve frictional groove (62) of single section;
Described sleeve frictional groove (62) arranges evenly that by section 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 awl 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) is provided with tail seal plug (1), and the other end is provided with 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 an 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 awl 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 awl 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 large deformation of suitable for surrounding rock and automatically extending automatically simultaneously can absorb the deformation energy of country rock, thereby guarantee its supporting effect in deformation process.
Description of drawings
Fig. 1 is a structural representation one of the present invention.
Fig. 2 is a 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 the drawing in side sectional elevation and the axonometric drawing of awl 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-awl tooth friction piece 6-friction sleeve 7-head seal plug 8-body of rod
9-stopper preformed hole 31-backing plate preformed hole 51-awl 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, awl 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, evenly arrange by section, every section is established 2 ~ 8 (among Fig. 4, Fig. 5 being 4), axial spacing along friction sleeve 6 is 5 ~ 30cm, and the minimum vertical clear distance in sleeve frictional groove 62 cross sections can interact when relative displacement takes place to guarantee both less than the width of awl tooth 51 crowns.
The body of rod 8 is provided with awl 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 awl tooth friction piece 5 length are arranged along friction sleeve 6 greater than sleeve frictional groove 62, thereby the continuity of 62 pairs of awls of realization sleeve frictional groove tooth friction piece, 5 barrier force.Awl 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; Awl 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.Awl tooth 51 is established on the surface of awl tooth friction piece 5, awl tooth 51 cross sections are trapezoidal or other shape (being trapezoidal among Fig. 7), arrange evenly that along awl 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, awl tooth 51 is isometric with awl tooth friction piece 5.
The width of awl 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 big, 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 subjected to as the present invention is during less than the barrier force of 62 pairs of awls of sleeve frictional groove tooth friction piece 5, and friction sleeve 6 and awl tooth friction piece 5, the body of rod 8 are in relative static conditions; Relative displacement will take place between friction sleeve 6 and awl tooth friction piece 5, the body of rod 8 during greater than the barrier force of 62 pairs of awls of sleeve frictional groove tooth friction piece 5 in the axial tension that is subjected to as the present invention.Along with the increase of displacement, the lateral elasticity distortion at first takes place in sleeve frictional groove 62, and then produces plastic failure to a certain degree.The distortion of country rock simultaneously 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 awl tooth friction piece 5, will no longer relative displacement take place between friction sleeve 6 and the awl tooth friction piece 5 and remain static.When awl tooth friction piece 5 is about to slip away a sleeve frictional groove 62 sections, will organize sleeve frictional groove 62 with next and contact, thus the continuity of realization barrier force.Awl 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 awl tooth friction piece 5 does not break away from friction sleeve 6.When awl 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 geotechnical body and moisture engaging friction sleeve 6 inside from causing internal construction generation corrosion, destruction, establish tail seal plug 1 and head seal plug 7 respectively 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, a little difference is only arranged with structural representation one.Awl 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 made up 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 awl 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 awl tooth friction piece 5 with 62 relative displacements of sleeve frictional groove, interaction has taken place with sleeve frictional groove 62 in awl tooth 51, and 62 pairs of awls of sleeve frictional groove tooth friction piece 5 has produced barrier force.
Figure 5 shows that the c-c sectional drawing.When boring tooth friction piece 5 when sleeve frictional groove 62 moves, originally awl tooth 51 does 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 the drawing in side sectional elevation and the axonometric drawing of awl tooth friction piece 5.Awl tooth friction piece 5 cross sections are butterfly shape, and awl tooth 51 cross sections are trapezoidal, also can be other shape.Awl tooth 51 quantity are 2 ~ 8, are 4 among Fig. 7, and awl tooth 51 is isometric with awl 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 awl tooth friction piece 5 directly processing is equivalent to affixed at the head of the body of rod 8; And awl 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 had both controlled surrouding rock deformation when interacting with country rock, allow surrouding rock deformation again, distortion along with country rock, the present invention stretches automatically and provides lasting supporting power to country rock, thereby realizes the stable of geotechnical body, has eliminated 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 awl tooth friction piece 5.The present invention is simple in structure, and is easy to make, cheap.
Claims (10)
1. bore resistance formula friction sleeve large deformation anchor rod for one kind, comprise outer nut (2), backing plate (3), awl 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 awl tooth friction piece (5).
2. a kind of awl resistance formula friction sleeve large deformation anchor rod according to claim 1, it is characterized in that: described outer nut (2) and backing plate (3) are sleeved on the afterbody of friction sleeve (6) successively.
3. a kind of awl resistance formula friction sleeve large deformation anchor rod according to claim 1, it is characterized in that: described outer nut (2) and backing plate (3) are sleeved on the afterbody of the body of rod (8) successively.
4. a kind of awl resistance formula friction sleeve large deformation anchor rod according to claim 1, it is characterized in that: described awl 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), awl tooth (51) is established on described awl tooth friction piece (5) surface, described awl tooth (51) section is trapezoidal or other shape, arrange evenly that along awl tooth friction piece (5) girth its quantity equates with the sleeve frictional groove (62) of single section;
Described sleeve frictional groove (62) arranges evenly that by section 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 awl tooth (51) crown.
5. a kind of awl resistance formula friction sleeve large deformation anchor rod according to claim 4, 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.
6. a kind of awl 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) is provided with tail seal plug (1), and the other end is provided with head seal plug (7).
7. a kind of awl 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.
8. a kind of awl 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 an 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).
9. a kind of awl resistance formula friction sleeve large deformation anchor rod according to claim 2, it is characterized in that: described awl 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 described inner nut (4), or directly process at the described body of rod (8) afterbody.
10. a kind of awl resistance formula friction sleeve large deformation anchor rod according to claim 3, it is characterized in that: described awl 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 described 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 |
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| 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 true CN102086770A (en) | 2011-06-08 |
| CN102086770B 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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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104373145A (en) * | 2014-11-04 | 2015-02-25 | 中国矿业大学 | Anchor device with functions of embedding, constant-resistance classifying, shear resisting and large deforming and method |
| CN104895597A (en) * | 2015-01-30 | 2015-09-09 | 湖南科技大学 | Large-deformation constant-resistance periodic yielding bolt |
| CN105422152A (en) * | 2015-12-28 | 2016-03-23 | 山东科技大学 | Large-deformation shear-resistant anchor rod and mounting method thereof |
| 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 |
| CN109339840A (en) * | 2018-11-13 | 2019-02-15 | 重庆大学 | A kind of antitorque large deformation anchor rod |
| CN109339842A (en) * | 2018-11-13 | 2019-02-15 | 重庆大学 | A kind of liquid metal sensor and the large deformation anchor rod using the sensor monitoring and 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 |
| CN114542144A (en) * | 2022-02-22 | 2022-05-27 | 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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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104373145A (en) * | 2014-11-04 | 2015-02-25 | 中国矿业大学 | Anchor device with functions of embedding, constant-resistance classifying, shear resisting and large deforming and method |
| CN104895597B (en) * | 2015-01-30 | 2017-07-28 | 湖南科技大学 | A kind of large deformation constant-resistance periodicity pressure-relieving achor bar |
| CN104895597A (en) * | 2015-01-30 | 2015-09-09 | 湖南科技大学 | Large-deformation constant-resistance periodic yielding bolt |
| CN105422152A (en) * | 2015-12-28 | 2016-03-23 | 山东科技大学 | Large-deformation shear-resistant anchor rod and mounting method thereof |
| 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 |
| CN109339840A (en) * | 2018-11-13 | 2019-02-15 | 重庆大学 | A kind of antitorque large deformation anchor rod |
| CN109339842A (en) * | 2018-11-13 | 2019-02-15 | 重庆大学 | A kind of liquid metal sensor and the large deformation anchor rod using the sensor monitoring and warning |
| 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 |
| CN109339840B (en) * | 2018-11-13 | 2024-03-05 | 重庆大学 | Anti-torsion large-deformation anchor rod |
| 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 |
| CN114542144A (en) * | 2022-02-22 | 2022-05-27 | 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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