CN113153393A - Self-adaptive anti-shearing large-deformation anchor rod - Google Patents
Self-adaptive anti-shearing large-deformation anchor rod Download PDFInfo
- Publication number
- CN113153393A CN113153393A CN202110612154.6A CN202110612154A CN113153393A CN 113153393 A CN113153393 A CN 113153393A CN 202110612154 A CN202110612154 A CN 202110612154A CN 113153393 A CN113153393 A CN 113153393A
- Authority
- CN
- China
- Prior art keywords
- connecting rod
- section
- end connecting
- anchoring
- sleeve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010008 shearing Methods 0.000 title abstract description 42
- 238000004873 anchoring Methods 0.000 claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 230000003044 adaptive effect Effects 0.000 claims 3
- 239000002689 soil Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 235000010575 Pueraria lobata Nutrition 0.000 description 1
- 241000219781 Pueraria montana var. lobata Species 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/008—Anchoring or tensioning means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0093—Accessories
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a self-adaptive anti-shearing large-deformation anchor rod which comprises a free section, an anti-shearing large-deformation section and an anchoring section. The anti-shearing large deformation section is composed of an anchoring end connecting rod, a free end connecting rod and a sleeve. And the front end of the anchoring end connecting rod is connected with the threaded end of the sleeve, and the rear end of the anchoring end connecting rod is hinged with the front end of the anchoring section through a fork joint. One end of the free end connecting rod is inserted into a section of the sleeve with the latch, a plurality of steel balls are arranged at the rearmost position of the latch along the circumferential direction of the free end connecting rod, a bolt is arranged at the end part of the free end connecting rod, the bolt blocks the steel balls and extrudes the steel balls to cut the latch to provide resistance, and the large deformation is adapted; the other end of the free end connecting rod is hinged with the rear end of the free section through a fork joint. According to the anchor rod, the anti-shearing large deformation section is hinged with the free section and the anchoring section, so that the shearing force is converted into the axial force, the deformation and shearing resistance is improved, and the constant resistance is provided by the steel balls cutting the clamping teeth in the sleeve.
Description
Technical Field
The invention relates to an anchor rod in slope engineering, tunnel engineering and mining engineering, in particular to a self-adaptive anti-shearing large-deformation anchor rod.
Background
Global climate changes dramatically since the 21 st century, and extreme weather frequently occurs, which leads to a drastic increase in geological disasters, while landslides are widely concerned due to their high harmfulness and most widespread distribution. Great loss and influence caused by landslide disasters have attracted high attention of China and wide social attention, and effective landslide prevention and control and scientific evaluation are urgent requirements for guaranteeing the safety of social economy and life and property of people. The anchoring technology is widely applied to the slope engineering, the tunnel engineering and the mining engineering in the world due to the initiative, the safety and the economy, but the traditional pressure type/tension type anchoring technology cannot adapt to the complex geological environment. The landslide generates large shearing deformation along the sliding surface, so that the shearing damage of a prevention and control structure, the failure of an anti-skidding system and the instability damage of the landslide are caused.
The existing anchor rod consists of an anchor head, a pull rod and an anchoring body. The anchor head consists of an anchorage device, a bearing plate, a cross beam and a pedestal; the pull rod is made of steel bars and steel strands; the anchoring body is an anti-pulling component which is formed by connecting a pull rod and a soil body into a whole by cement paste or cement mortar. The different sections of the anchor rod play different anchoring roles in the soil layer. The free section is positioned in an unstable soil layer which can slide, can freely stretch and retract, and has the function of transmitting the load borne by the anchor head to the anchoring section outside the driving sliding surface; the anchoring section is positioned in the stabilized soil layer and firmly combined with the surrounding soil layer to disperse the load into the stabilized soil body.
At present, scholars mainly improve the structure of a two-section anchor rod, for example, Kudzuvine peak and the like invent a novel anti-shearing large-deformation anchor rod comprising an anchoring section rod body, a free section rod body, a sleeve, a constant-resistance block and a connecting sleeve, the connecting sleeve generates elastic deformation to resist the shearing deformation of a rock-soil body, and the constant-resistance block provides constant resistance for the anchor rod; there are also trainees who provide serrated sleeves in the anchor head area to resist large shear deformations.
The anti-shearing large-deformation anchor rod structure provided by the scholars at present improves the anchor rod from the aspects of materials and structures, but the state of the anchor rod body under shearing acting force is not changed, the anchor rod can be easily sheared and damaged after being deformed to a certain degree, and some requirements on the elastic property of the materials are high. The invention provides a novel anti-shearing large-deformation anchor rod, which changes the stress state of the anchor rod, converts shearing force into axial force of the anchor rod and adapts to large deformation caused by shearing of a geologic body.
Disclosure of Invention
The invention aims to solve the problem that the defects in the prior art are overcome, and the self-adaptive anti-shearing large-deformation anchor rod is provided.
The invention relates to a self-adaptive anti-shearing large-deformation anchor rod, which comprises a free section, an anti-shearing large-deformation section and an anchoring section;
the shear-resistant large deformation section consists of an anchoring end connecting rod, a free end connecting rod and a sleeve, wherein the inner wall of one end of the sleeve is provided with a thread, and the inside of the other end of the sleeve is provided with a latch; the latch is of a type with a front part being gradually gentle and a rear part being steep (the free section is taken as the front part), and the angle and the thickness of the latch can be changed, so that constant resistance and different energy absorption paths with different sizes can be realized;
the rear part of the anchoring end connecting rod is provided with a fork joint, the front part of the anchoring end connecting rod is provided with threads, the front end of the anchoring end connecting rod is connected with the threaded end of the sleeve, and the rear end of the anchoring end connecting rod is hinged with the front end of the anchoring section through the fork joint; the fork joint can rotate vertically, and the shearing force of the geologic body can be converted into the axial force of the anchor rod;
one end of the free end connecting rod is inserted into a section of the sleeve with the latch, a plurality of steel balls are arranged at the rearmost position of the latch along the circumferential direction of the free end connecting rod, a bolt is arranged at the end part of the free end connecting rod, the bolt blocks the steel balls, and the steel balls cannot fall off from the free end connecting rod; the diameter of the steel balls is larger than the distance between the free end connecting rod and the inner wall of the sleeve, the steel balls are distributed on the circumferential direction of the free end connecting rod at equal intervals, and different resistances can be realized by changing the diameter and the number of the steel balls; the other end of the free end connecting rod is provided with a fork joint which is hinged with the rear end of the free section.
The fork joint can be hinged in a manner of a lantern ring and a universal shaft.
The anchor rod is changed from a traditional free section and an anchoring section into a free section, a shearing-resistant large deformation section and an anchoring section, the shearing-resistant large deformation section is hinged with the free section and the anchoring section to convert shearing force into axial force and improve the shearing resistance and the deformation resistance, the bending-resistant shearing large deformation section is composed of a sleeve with continuous latch teeth, a steel ball and two connecting rods, and the steel ball cuts the latch teeth in the sleeve to provide constant resistance. The invention has no other requirements on materials, can convert the shearing force acting on the anchor rod into axial force by adopting a hinged structure on the basis of the existing materials, provides resistance by cutting the latch through the steel ball at the bending-resistant shearing large deformation section, adapts to shearing deformation at the same time, and improves the cooperative deformation process of the anchor rod and the landslide and the long-term stability of the landslide.
Drawings
Fig. 1 is a schematic structural diagram of the self-adaptive shear-resistant large-deformation anchor rod of the invention.
FIG. 2 is a sectional view of a shear resistant large deformation section at a steel ball position.
Fig. 3 is a schematic view of the rock bolt of the present invention adapted to shear deformation during a landslide motion.
FIG. 4 is a schematic diagram of the steel ball cutting sleeve adapting to large deformation.
Fig. 5 is a photograph of the steel ball cut latch.
Detailed Description
The present invention will be described in further detail with reference to the following examples and the accompanying drawings.
Examples
The invention discloses a self-adaptive anti-shearing large-deformation anchor rod, which comprises a free section 1, an anti-shearing large-deformation section 2 and an anchoring section 3. The anti-shearing large deformation section 2 consists of an anchoring end connecting rod 21, a free end connecting rod 22 and a sleeve 23, wherein the sleeve 23 is a steel sleeve, the inner wall of one end of the sleeve 23 is provided with a thread, and the inside of the other end of the sleeve is provided with a latch 24; the latch 24 is of a type with a front part being gradually gentle and a rear part being steep (the free section is the front part), and the angle and the thickness of the latch can be changed, so that constant resistance and different energy absorption paths with different sizes can be realized. The rear part of the anchoring end connecting rod 21 is provided with a fork joint 25, the front part of the anchoring end connecting rod is provided with a thread 6, the front end of the anchoring end connecting rod 21 is connected with the thread end of the sleeve 23, and the rear end of the anchoring end connecting rod 21 is hinged with the front end of the anchoring section 3 through the fork joint 25. The fork joint can rotate along the vertical direction, and the shearing force of the geologic body can be converted into the axial force of the anchor rod. One end of the free end connecting rod 22 is inserted into a section of the sleeve 23 with the latch 24, a plurality of steel balls 4 are arranged at the rearmost position of the latch 24 along the circumference of the free end connecting rod 22, a bolt 5 is arranged at the end part of the free end connecting rod, the bolt 5 blocks the steel balls 4, and the steel balls 4 cannot fall off from the free end connecting rod 22; the diameter of the steel balls is larger than the distance between the free end connecting rod and the inner wall of the sleeve, the steel balls are arranged on the circumferential direction of the free end connecting rod 22 at equal intervals, and different resistances can be realized by changing the diameter and the number of the steel balls. The other end of the free end connecting rod 22 is provided with a clevis 26, and the clevis is hinged with the rear end of the free section.
Test process (anchor rod working process): in the process of landslide movement, the slide bed does not move, the slide strip is a shear strip, and the slide body moves along the movement direction. The sliding body moves to drive the anchor rod free section 1 to move along the movement direction and drive the anchor rod anti-shearing large deformation section 2 to move, and because the fork joint can rotate, the shearing force acting on the anchor rod free section 1 is converted into the axial force of the anchor rod anti-shearing large deformation section 2, and the anchor rod anti-shearing large deformation section 2 is pulled to move axially; the sleeve deflects with the anchor end connecting rod 21 and the free end connecting rod 22. Under the action of axial force, the free end connecting rod 22 of the anchor rod drives the bolt 5 to move, the bolt 5 extrudes the steel ball 4, the steel ball 4 is pressed into the latch 24, and resistance is provided for the free end connecting rod 22. Along with the increase of the displacement of the sliding body, the fork joint rotates, the steel ball cuts the latch, and the displacement is gradually increased.
The key points of the invention are as follows: the anchor rod is changed from a traditional two-section mode of a free section and an anchoring section into a three-section mode of the free section, a shear-resistant large deformation section and the anchoring section, and the shear-resistant large deformation section is hinged with the free section and the anchoring section to convert a shearing force into an axial force; the bending-resistant shearing large deformation section consists of a sleeve with continuous clamping teeth, a steel ball and an inner sleeve, and the steel ball cuts the clamping teeth in the sleeve to provide constant resistance. The shearing force acting on the anchor rod is converted into axial force by adopting a hinged structure, the bending-resistant shearing large deformation section provides resistance by cutting the latch through the steel ball, and meanwhile, the shear deformation is adapted, and the cooperative deformation process of the anchor rod and the landslide and the long-term stability of the landslide are improved.
In the invention, the hinged structure realized by the fork joint can also be other structures which can realize hinging, such as a lantern ring, a universal shaft and the like. The shear resistant large deformation section can also be made of a constant resistance block made of a negative Poisson ratio material to provide constant resistance and large deformation.
Claims (4)
1. The utility model provides a big deformation stock of self-adaptation anti-shear, characterized by: comprises a free section, a shear resistant large deformation section and an anchoring section;
the shear-resistant large deformation section consists of an anchoring end connecting rod, a free end connecting rod and a sleeve, wherein the inner wall of one end of the sleeve is provided with a thread, and the inside of the other end of the sleeve is provided with a latch;
the rear part of the anchoring end connecting rod is provided with a fork joint, the front part of the anchoring end connecting rod is provided with threads, the front end of the anchoring end connecting rod is connected with the threaded end of the sleeve, and the rear end of the anchoring end connecting rod is hinged with the front end of the anchoring section through the fork joint;
one end of the free end connecting rod is inserted into a section of the sleeve with the latch, a plurality of steel balls are arranged at the rearmost position of the latch along the circumferential direction of the free end connecting rod, a bolt is arranged at the end part of the free end connecting rod, the bolt blocks the steel balls, and the steel balls cannot fall off from the free end connecting rod; the other end of the free end connecting rod is provided with a fork joint which is hinged with the rear end of the free section.
2. The adaptive shear-resistant large deformation anchor rod of claim 1, wherein: the latch is of a type with a front part being gradually gentle and a rear part being steep.
3. The adaptive shear-resistant large deformation anchor rod of claim 1, wherein: the diameter of the steel balls is larger than the distance between the free end connecting rod and the inner wall of the sleeve, and the steel balls are arranged on the circumference of the free end connecting rod at equal intervals.
4. The adaptive shear-resistant large deformation anchor rod of claim 1, wherein: the fork joint is replaced by a lantern ring and a universal shaft to realize hinging.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110612154.6A CN113153393B (en) | 2021-06-02 | 2021-06-02 | Self-adaptive anti-shearing large-deformation anchor rod |
| PCT/CN2021/098540 WO2022252243A1 (en) | 2021-06-02 | 2021-06-07 | Self-adaptive anti-shearing large-deformation anchor rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110612154.6A CN113153393B (en) | 2021-06-02 | 2021-06-02 | Self-adaptive anti-shearing large-deformation anchor rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113153393A true CN113153393A (en) | 2021-07-23 |
| CN113153393B CN113153393B (en) | 2022-08-02 |
Family
ID=76875499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110612154.6A Active CN113153393B (en) | 2021-06-02 | 2021-06-02 | Self-adaptive anti-shearing large-deformation anchor rod |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN113153393B (en) |
| WO (1) | WO2022252243A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114483135A (en) * | 2021-12-28 | 2022-05-13 | 武汉大学 | Sectional bidirectional large-deformation anchor rod |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101250875A (en) * | 2008-04-15 | 2008-08-27 | 昆明理工大学 | Pawl type self-locking anchor bar, chorda |
| CN105257328A (en) * | 2015-11-30 | 2016-01-20 | 湖南科技大学 | Segmented anchoring and grouting anchor rod device capable of achieving automatic clamping and anchoring method thereof |
| CN107218072A (en) * | 2017-07-10 | 2017-09-29 | 中国矿业大学 | A kind of extrusion friction type constant-resistance allows pressure large deformation anchor rod |
| CN108756974A (en) * | 2018-04-25 | 2018-11-06 | 中国地质大学（武汉） | A kind of novel anti-shearing large deformation anchor rod |
| CN109750664A (en) * | 2019-01-28 | 2019-05-14 | 中国矿业大学(北京) | A kind of Novel Bipolar constant resistance and large deformation anchor rod component |
| CN211397620U (en) * | 2019-09-04 | 2020-09-01 | 谢时雳 | Recoverable expanding anchor rod |
| CN112177648A (en) * | 2020-09-28 | 2021-01-05 | 中国矿业大学 | Novel anti-shearing large-deformation energy-absorbing anchor rod |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4437795A (en) * | 1981-11-02 | 1984-03-20 | Birmingham Bolt Company | Mine roof anchor assembly |
| CN201943725U (en) * | 2011-03-15 | 2011-08-24 | 北京科技大学 | Friction sleeve type large-deformation anchor rod |
| CN206246140U (en) * | 2016-12-06 | 2017-06-13 | 山东科技大学 | A kind of constant-resistance allows pressure assembled bolt |
| CN206337561U (en) * | 2016-12-30 | 2017-07-18 | 山东大学 | A kind of anchor pole for being used to improve retaining wall bearing capacity |
| CN108868853A (en) * | 2018-08-22 | 2018-11-23 | 缪协兴 | One kind allows pressing glass steel anchor pole |
| CN209654064U (en) * | 2019-03-07 | 2019-11-19 | 湖南科技大学 | A kind of pressure-relieving achor bar for deep roadway with large deformation surrounding rock supporting |
-
2021
- 2021-06-02 CN CN202110612154.6A patent/CN113153393B/en active Active
- 2021-06-07 WO PCT/CN2021/098540 patent/WO2022252243A1/en active Application Filing
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101250875A (en) * | 2008-04-15 | 2008-08-27 | 昆明理工大学 | Pawl type self-locking anchor bar, chorda |
| CN105257328A (en) * | 2015-11-30 | 2016-01-20 | 湖南科技大学 | Segmented anchoring and grouting anchor rod device capable of achieving automatic clamping and anchoring method thereof |
| CN107218072A (en) * | 2017-07-10 | 2017-09-29 | 中国矿业大学 | A kind of extrusion friction type constant-resistance allows pressure large deformation anchor rod |
| CN108756974A (en) * | 2018-04-25 | 2018-11-06 | 中国地质大学（武汉） | A kind of novel anti-shearing large deformation anchor rod |
| CN109750664A (en) * | 2019-01-28 | 2019-05-14 | 中国矿业大学(北京) | A kind of Novel Bipolar constant resistance and large deformation anchor rod component |
| CN211397620U (en) * | 2019-09-04 | 2020-09-01 | 谢时雳 | Recoverable expanding anchor rod |
| CN112177648A (en) * | 2020-09-28 | 2021-01-05 | 中国矿业大学 | Novel anti-shearing large-deformation energy-absorbing anchor rod |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114483135A (en) * | 2021-12-28 | 2022-05-13 | 武汉大学 | Sectional bidirectional large-deformation anchor rod |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113153393B (en) | 2022-08-02 |
| WO2022252243A1 (en) | 2022-12-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102286975B (en) | Constant-resistance energy-absorbing anchor rod for strengthening large-deformation rock body | |
| CN111441804B (en) | Anti-inclination yielding large-deformation anchoring device and use method thereof | |
| CN110043300B (en) | Umbrella-shaped anchor for rapidly reinforcing rock mass and application method | |
| CN113153393B (en) | Self-adaptive anti-shearing large-deformation anchor rod | |
| CN102086770B (en) | Cone resistive friction sleeve large-deformation anchor rod | |
| CN111425231B (en) | Long and short anchor cable coordinated energy absorption yielding device and construction method | |
| CN107227967A (en) | A kind of constant resistance and large deformation pressure-relieving achor bar or anchor cable | |
| CN203296794U (en) | Yielding extensible fiber reinforced plastic anchor rod | |
| CN108979691A (en) | A kind of multistage pressure-relieving achor bar | |
| CN107218072A (en) | A kind of extrusion friction type constant-resistance allows pressure large deformation anchor rod | |
| CN110925001B (en) | Buffer protection device for preventing anchor cable from being ejected due to failure | |
| CN203962011U (en) | A kind of rock bolt of segmentation anchoring | |
| CN206769935U (en) | A kind of top expands grouted anchor bar | |
| CN208545747U (en) | It is segmented reaming pressure anchor wire structure | |
| CN110777960A (en) | Beam hinge assembly type self-resetting friction connection node structure and method | |
| CN212837890U (en) | Pull expansion type anchor rod | |
| CN106894835B (en) | Let pressure stock | |
| CN112523791B (en) | Annular anchor rope supporting system for reinforcing rock wall in highway small clear distance tunnel | |
| CN203655326U (en) | Liquid-expansion yielding shock and high ground temperature resistant anchor rod | |
| CN109339840B (en) | Anti-torsion large-deformation anchor rod | |
| CN1957159A (en) | Rock bolting method and rock bolt | |
| CN203096737U (en) | Automatic anchoring device | |
| CN209908543U (en) | Multistage yielding large-deformation anchor rod | |
| CN113026739A (en) | Self-adaptive friction type anti-shearing large-deformation anchor rod | |
| CN112962594A (en) | Construction method of environment-friendly tension-compression composite dispersed anchor rod |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |