CN106401627B - A kind of anchor metal and its application method allow with pressure - Google Patents
A kind of anchor metal and its application method allow with pressure Download PDFInfo
- Publication number
- CN106401627B CN106401627B CN201610846454.XA CN201610846454A CN106401627B CN 106401627 B CN106401627 B CN 106401627B CN 201610846454 A CN201610846454 A CN 201610846454A CN 106401627 B CN106401627 B CN 106401627B
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- China
- Prior art keywords
- upper shell
- rib
- mentioned
- pedestal
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 239000002184 metal Substances 0.000 title claims abstract description 24
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 13
- 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 claims abstract description 38
- 230000000149 penetrating effect Effects 0.000 claims abstract description 11
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 5
- 238000004873 anchoring Methods 0.000 claims description 4
- 239000011435 rock Substances 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 5
- QLMNCUHSDAGQGT-UHFFFAOYSA-N sintofen Chemical compound N1=C(C(O)=O)C(=O)C=2C(OCCOC)=CC=CC=2N1C1=CC=C(Cl)C=C1 QLMNCUHSDAGQGT-UHFFFAOYSA-N 0.000 description 5
- 230000005489 elastic deformation Effects 0.000 description 3
- 230000002045 lasting effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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
- E21D21/0006—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by the bolt material
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor 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
-
- 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)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention discloses a kind of anchor metal allow with pressure, on the basis of existing technology, it is additionally arranged one and allows pressure pedestal, the left pedestal of pressure pedestal is allowed to be an integral structure, including bottom plate, lower shell and upper shell three parts, the internal diameter of lower shell is d1, the internal diameter of upper shell is d2, the length of upper shell is 20~25mm, and the length of lower shell is 25~30mm；A number of penetrating notch is uniformly provided on the barrel of the cylinder of Right socle vertically, a number of rib is formed on barrel, with make it have be pressurized after generate the ability of larger flexible deformation；The length of cylinder is 45~50mm, wall thickness is 5~8mm, outer diameter d3；Above-mentioned d1≥d3, d3=d2+1mm.The application method of the present invention and the common bolt application method of the prior art are essentially identical, simple in structure, easy to use, processing and fabricating cost is cheap, supporting safety, the advantageous effects such as save worry laborsaving.
Description
Technical field
The present invention relates to a kind of anchor metal and its application method more particularly to a kind of anchor metals allow with pressure
And its application method.
Background technology
It is well known that the tensile strength of material and the entity that elongation at break is conflict.What rigid made
Anchor pole, although anchoring strength is big, in the Bracing Process of roadway with large deformation, particularly deform initial stage in country rock, institute
The deformation energy of generation quickly increases, this quickly becomes larger the axially loaded for causing anchor metal.It is conceivable that the anchor of metal material
Bar is often broken since elongation at break is minimum by moment, and suspension roof support is caused to fail, and may cause the generation of roof fall accident.
Based on this, pressure-relieving achor bar comes into being.But the various pressure-relieving achor bar generally existing processed complexs of the prior art,
It allows during pressure, " to lift power " caused by anchor pole asynchronous with the changing rule for the stress that the initial stage of crushing is released,
It is uncoordinated.If Chinese patent application CN102691513B discloses a kind of thick tail pressure-relieving achor bar of high duty metal, " splenium is allowed
Part " is allows pressure pipe, and the cydariform tubular structure for making pressure pipe thick for the detail of both ends between is (in fact, so-called " cydariform tubulose " is substantially
Upper is exactly a deformed shape for being similar to sphere).
It is clear that although this structure type allows pressure pipe, processing technology is relatively complicated.It is more crucial
It is, once pop-off, can not synchronously be followed the support force (or lifting power) of top under original state by its compressive deformation
During crushing, continuous aggregation, the increase of stress, until the changing rule of release, correspondingly, carries out top plate lasting
It lifts, with the aggregation of " gently, equably " buffering or this stress of decaying, increase, until stress release.
In other words, the pressure that allows for allowing pressure function or a kind of " rigidity " of the pressure-relieving achor bar of this structure type, is not one kind
It can remain and synchronously follow the rule that top stress is generated and discharged, carry out lasting " yielding ", so that top is answered
Power progressively decays, gently discharges, and realizes " defeating a force with a tenderness ".In actual use, due to the excessive velocities that pressure pipe is allowed to destroy
(momentary loss), thus, in " quick " deformation of top plate or sinking watching, it is difficult to avoid the occurrence of part sand, rubble or
The landing phenomenon of the stone of loosening.That is, this pressure-relieving achor bar, due to the inadequate natural endowment of its structure type so that in fact
Effect and security performance etc. are pressed in allowing for border generation, also there are many deficiencies, are had much room for improvement and are improved.
The content of the invention
It is an object of the invention to provide one kind is simple in structure, security is good, has suitable for standardization is industrial
Allow the anchor metal of pressure function.
Present invention technical solution used for the above purpose is, a kind of have the function of to allow the anchor metal pressed, and is
Fabricated structure, including bolt body, pallet and clamp nut, which is characterized in that it further includes pallet and allows and press pedestal, wherein,
Pressure pedestal is allowed to be mounted on the right side of pallet；
It is described that pressure pedestal is allowed to be split structure, including left pedestal and Right socle two parts；
The pallet offers the first centre bore；
The left pedestal is an integral structure, including bottom plate, lower shell and upper shell three parts, wherein, it is opened up on bottom plate
There is the second centre bore, the internal diameter of lower shell is d1, the internal diameter of upper shell is d2, upper shell is equal with lower shell outer diameter, upper shell
Length is 20mm~25mm, and the length of lower shell is 25mm~30mm；
The Right socle is the tube structure usherd to seat, including cylinder and seat board two parts, wherein, along axis on the barrel of cylinder
To the penetrating notch for being uniformly provided with a number of perforation cylinder head and the tail both ends, the 3rd centre bore is offered on seat board；
The wall surface of cylinder is cut into a number of rib by above-mentioned penetrating notch；
The outer diameter of above-mentioned seat board is more than the outer diameter of cylinder, and the length of cylinder is 45mm~50mm, wall thickness is 5mm~8mm, outer
Footpath is d3；
The aperture of first centre bore, the second centre bore and the 3rd centre bore is equal；
The pallet, left pedestal and Right socle are sequentially sleeved on from the end of bolt body in bolt body, respectively with anchor
Bar body forms loose fit；
The clamp nut is screwed into from the end of the bolt body, act against allow pressure pedestal right side on；
The first chamfering is provided at the inner wall wall edge of above-mentioned upper shell, is provided at the head outer wall wall edge of above-mentioned rib
Two chamferings；
Above-mentioned d1≥d3, d3=d2+1mm；
When in the left end insertion upper shell of the rib, the left end end face of rib and the boundary of above-mentioned upper shell and lower shell
When face is generally aligned in the same plane, the frictional force between the rib and upper shell is equal to the prestressing force of anchor pole；
When the root of the rib is inserted into upper shell, the right end end face of rib and the right side of above-mentioned upper shell are located at together
During one plane, the frictional force between the rib and upper shell is equal to the tensile strength of anchor pole.
The technical effect brought directely by the technical proposal is that on the basis of the anchor metal of the prior art, pass through increasing
If one is simple in structure, processing and fabricating cost is cheap " allow pressure pedestal " so that anchor metal has the function of reliably " allow pressure ",
It is low dexterously " to compensate for " anchor metal elongation at break, in direct capping seam, sinking watching, anchor metal is easy to quick
Ground is broken, and supporting is caused to fail, and then the problem of the generation of roof fall accident may be caused.
In above-mentioned technical proposal, Right socle barrel diameter is more than the interior of the upper shell (length is 20mm~25mm) of left pedestal
Footpath, therebetween into interference fit, and interference volume is relatively huge；
But due to " a number of perforation cylinder head and the tail both ends being uniformly provided on the barrel of Right socle cylinder vertically
Penetrating notch, the wall surface of cylinder is cut into a number of rib by these penetrating notches " so that Right socle cylinder it is straight
Footpath in directly sinking watching is pushed up, can generate phase with the changing rule " synchronously " of lower pressure caused by directly top sinking
The flexible deformation of size is answered, and is constantly inserted into the inner barrel of left pedestal, lasting " lifting power ", the buffering formed to directly pushing up
The rate sunk directly is pushed up, effectively discharges and directly pushes up generated stress in sinking watching, the concentration of stress is avoided to discharge,
The generation of roof fall accident caused by the formation of the bump of induction.
The cylinder of the left pedestal of above-mentioned technical proposal is divided into upper and lower two sections, internal diameter small one and large one, and only upper shell with
The insertion end of Right socle into interference fit (lower shell is not in contact with the insertion end of Right socle).This, which to allow, presses pedestal, not
In the case of considering rib elastic deformation amount, " resistance " of generation is constant resistance.
In fact, make the elastic deformation amount for the rib for pressing pedestal and the distance of interference fit section to rib root in direct ratio
(lever principle).That is, directly top sink under the action of, allow pressure pedestal caused by " resistance " from small to large (because,
The arm of force of " lever " is shorter and shorter, rib elastic deformation amount is less and less, and the interference volume between left pedestal and Right socle is more next
It is bigger), linearly rise, until the prestressing force that the resistance provides needed for anchor pole, until reaching bolt body
Until tensile strength.
This gradual " resistance " changing rule from small to large, special " agreeing with " directly top sink caused by stress release
Put rule.This is also the especially important technical characterstic of the present invention.
Preferably, the quantity of above-mentioned rib is 4~8；Above-mentioned first chamfering and the second chamfering be 4 × 60 ° or 6 ×
45°。
What the optimal technical scheme was directly brought has the technical effect that, since Right socle is opposite " slightly strengthening ", selects 4 × 60 °
Or 6 × 45 ° of chamfering, beneficial to being rapidly aligned with and be inserted into the endoporus of the upper shell of left pedestal.That is, pacify convenient for anchor pole
After dress is in place, Quick fastening clamp nut reaches required prestressing force.
In the case where barrel is thick centainly, rib quantity is near with causing the extruding force size that rib generates flexible deformation
Seemingly into (linear) proportionate relationship.The quantity of rib is 4~8, and one is easy for processing, second is that, convenient for the saving of material.
The second purpose of the invention is to provide a kind of application methods of the above-mentioned anchor metal allow with pressure.
Present invention technical solution used for the above purpose is a kind of application method of above-mentioned anchor metal,
It is characterised in that it includes following steps：
The first step, by the assembling of each component in place；
Second step stays in drilling on the rock mass of required anchoring, after bolt body installation in place, tightens clamp nut, up to
Reach required prestressing force, you can.
The technical effect brought directely by the technical proposal is that except anchor pole pre-assembly is slightly more cumbersome than the prior art or multiple
Outside more miscellaneous (having had more two components), any installation workload is not increased.
In other words, application method of the invention is simple, installation is in place and adjusts clamp nut so that anchor pole reaches required
After prestressing force, " putting things right once and for all "：Supporting safety, the workload that underground construction personnel " check and make an inspection tour " can be greatly reduced.
In conclusion the present invention compared with the prior art, has, simple in structure, easy to use, processing and fabricating cost is cheap,
Supporting safety, the advantageous effects such as save worry laborsaving.
Description of the drawings
Fig. 1 be the present invention have the function of allow press anchor metal schematic cross-sectional view.
Reference sign：1st, anchor rod body, 2, upper shell, 3, lower shell, 4, clamp nut, 5, rib, 6, penetrating slot
Mouthful, 7, pallet.
Specific embodiment
Below in conjunction with the accompanying drawings, the present invention is described in detail.
As shown in Figure 1, the anchor metal allow with pressure of the present invention, for fabricated structure, including 1 He of bolt body
Clamp nut 4, which is characterized in that it further includes pallet 7 and allows and press pedestal, wherein, pressure pedestal is allowed to be mounted on the right side of pallet；
It is above-mentioned that pressure pedestal is allowed to be split structure, including left pedestal and Right socle two parts；
Above-mentioned pallet offers the first centre bore；
Above-mentioned left pedestal is an integral structure, including 2 three parts of bottom plate, lower shell 3 and upper shell, wherein, it is opened on bottom plate
Equipped with the second centre bore, the internal diameter of lower shell is d1, the internal diameter of upper shell is d2, upper shell is equal with lower shell outer diameter, upper shell
Length for 20mm~25mm, the length of lower shell is 25mm~30mm；
Above-mentioned Right socle is the tube structure usherd to seat, including cylinder and seat board two parts, wherein, along axis on the barrel of cylinder
To the penetrating notch 6 for being uniformly provided with a number of perforation cylinder head and the tail both ends, the 3rd centre bore is offered on seat board；
The wall surface of cylinder is cut into a number of rib 5 by above-mentioned penetrating notch；
The outer diameter of above-mentioned seat board is more than the outer diameter of cylinder, and the length of cylinder is 45mm~50mm, wall thickness is 5mm~8mm, outer
Footpath is d3；
The aperture of above-mentioned first centre bore, the second centre bore and the 3rd centre bore is equal；
Above-mentioned pallet, left pedestal and Right socle are sequentially sleeved on from the end of bolt body in bolt body, respectively with anchor
Bar body forms loose fit；
Above-mentioned clamp nut is screwed into from the end of above-mentioned bolt body, act against allow pressure pedestal right side on；
The first chamfering is provided at the inner wall wall edge of above-mentioned upper shell, is provided at the head outer wall wall edge of above-mentioned rib
Two chamferings；
Above-mentioned d1≥d3, d3=d2+1mm；
When in the left end insertion upper shell of the rib, the left end end face of rib and the boundary of above-mentioned upper shell and lower shell
When face is generally aligned in the same plane, the frictional force between the rib and upper shell is equal to the prestressing force of anchor pole；
When the root of the rib is inserted into upper shell, the right end end face of rib and the right side of above-mentioned upper shell are located at together
During one plane, the frictional force between the rib and upper shell is equal to the tensile strength of anchor pole.
The outer diameter of above-mentioned pallet is more than the bottom plate outer diameter of above-mentioned left pedestal, the outer diameter of pallet for bolt body outer diameter 30~
50 times, the bottom plate outer diameter of left pedestal is 20~25 times of bolt body outer diameter.
The quantity of above-mentioned rib is 4~8；
Above-mentioned first chamfering and the second chamfering are 4 × 60 ° or 6 × 45 °.
Explanation：The making material for allowing pressure pedestal of the anchor metal of the present invention, can be directly using thick walled steel tube and thick steel
Plate is processed, the bottom plate of left pedestal and the bottom plate of Right socle respectively with its barrel soldering.That is, anchor metal of the invention allows
Pressure pedestal making material is easily obtained, and production method is simple, the processing capacity of material is small, cost of manufacture is cheap.
To more fully understand the present invention, be briefly described below having the function of allowing pressure anchor metal application method.
The application method of the above-mentioned anchor metal allow with pressure, which is characterized in that comprise the following steps：
The first step, by the assembling of each component in place；
Second step stays in drilling on the rock mass of required anchoring, after bolt body installation in place, tightens clamp nut, up to
Reach required prestressing force, you can.
Claims (3)
1. a kind of anchor metal allow with pressure, is fabricated structure, including bolt body, pallet and clamp nut,
Be characterized in that, further included one allow pressure pedestal, wherein, allow pressure pedestal be mounted on pallet right side；
It is described that pressure pedestal is allowed to be split structure, including left pedestal and Right socle two parts；
The pallet offers the first centre bore；
The left pedestal is an integral structure, including bottom plate, lower shell and upper shell three parts, wherein, is offered on bottom plate
Two centre bores, the internal diameter of lower shell is d1, the internal diameter of upper shell is d2, upper shell is equal with lower shell outer diameter, the length of upper shell
For 20mm~25mm, the length of lower shell is 25mm~30mm；
The Right socle is the tube structure usherd to seat, including cylinder and seat board two parts, wherein, on the barrel of cylinder vertically
It is even to offer a number of penetrating notch for penetrating through cylinder head and the tail both ends, offer the 3rd centre bore on seat board；
The wall surface of cylinder is cut into a number of rib by above-mentioned penetrating notch；
The outer diameter of above-mentioned seat board is more than the outer diameter of cylinder, and the length of cylinder is 45mm~50mm, wall thickness is 5mm~8mm, outer diameter is
d3；
The aperture of first centre bore, the second centre bore and the 3rd centre bore is equal；
The pallet, left pedestal and Right socle are sequentially sleeved on from the end of bolt body in bolt body, respectively with anchor pole sheet
Body forms loose fit；
The clamp nut is screwed into from the end of the bolt body, act against allow pressure pedestal right side on；
The first chamfering is provided at the inner wall wall edge of above-mentioned upper shell, being provided with second at the head outer wall wall edge of above-mentioned rib falls
Angle；
Above-mentioned d1≥d3, d3=d2+1mm；
When in the left end insertion upper shell of the rib, the left end end face of rib and the interface position of above-mentioned upper shell and lower shell
When same plane, the frictional force between the rib and upper shell is equal to the prestressing force of anchor pole；
When the root of the rib is inserted into upper shell, the right end end face of rib and the right side of above-mentioned upper shell are put down positioned at same
During face, the frictional force between the rib and upper shell is equal to the tensile strength of anchor pole.
2. there is to allow according to claim 1 the anchor metal of pressure, which is characterized in that the quantity of the rib is 4~8
It is a；
First chamfering and the second chamfering are 4 × 60 ° or 6 × 45 °.
3. the application method allow with the anchor metal pressed as described in claim 1, which is characterized in that including following step
Suddenly：
The first step, by the assembling of each component in place；
Second step stays in drilling on the rock mass of required anchoring, after bolt body installation in place, clamp nut is tightened, up to reaching
Required prestressing force, you can.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610846454.XA CN106401627B (en) | 2016-09-23 | 2016-09-23 | A kind of anchor metal and its application method allow with pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610846454.XA CN106401627B (en) | 2016-09-23 | 2016-09-23 | A kind of anchor metal and its application method allow with pressure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106401627A CN106401627A (en) | 2017-02-15 |
| CN106401627B true CN106401627B (en) | 2018-05-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610846454.XA Expired - Fee Related CN106401627B (en) | 2016-09-23 | 2016-09-23 | A kind of anchor metal and its application method allow with pressure |
Country Status (1)
| Country | Link |
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| CN (1) | CN106401627B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106894835B (en) * | 2017-03-16 | 2021-03-12 | 湖南大学 | Let pressure stock |
| CN109209457B (en) * | 2018-10-26 | 2020-01-21 | 辽宁工程技术大学 | Energy-absorbing impact-resistant anchor cable and using method thereof |
| CN115075853B (en) * | 2022-07-01 | 2023-09-15 | 同济大学 | Grading resistance-increasing yielding anchor rod with prestress |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203296794U (en) * | 2013-04-25 | 2013-11-20 | 安徽理工大学 | Yielding extensible fiber reinforced plastic anchor rod |
| CN103982211A (en) * | 2014-05-08 | 2014-08-13 | 河南理工大学 | High-strength large-deformation piston-type resistance-increasing anchor rod |
| CN204552782U (en) * | 2015-04-28 | 2015-08-12 | 西安科技大学 | A kind of anchor pole is by pressure device |
| CN105178313A (en) * | 2015-05-07 | 2015-12-23 | 重庆交通大学 | Yielding type anchor rod assembly |
| CN206111223U (en) * | 2016-09-23 | 2017-04-19 | 山东科技大学 | Metal anchor pole with let pressure function |
-
2016
- 2016-09-23 CN CN201610846454.XA patent/CN106401627B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203296794U (en) * | 2013-04-25 | 2013-11-20 | 安徽理工大学 | Yielding extensible fiber reinforced plastic anchor rod |
| CN103982211A (en) * | 2014-05-08 | 2014-08-13 | 河南理工大学 | High-strength large-deformation piston-type resistance-increasing anchor rod |
| CN204552782U (en) * | 2015-04-28 | 2015-08-12 | 西安科技大学 | A kind of anchor pole is by pressure device |
| CN105178313A (en) * | 2015-05-07 | 2015-12-23 | 重庆交通大学 | Yielding type anchor rod assembly |
| CN206111223U (en) * | 2016-09-23 | 2017-04-19 | 山东科技大学 | Metal anchor pole with let pressure function |
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| Publication number | Publication date |
|---|---|
| CN106401627A (en) | 2017-02-15 |
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Granted publication date: 20180529 |