CN207740024U - A kind of pressure-relieving achor bar - Google Patents
A kind of pressure-relieving achor bar Download PDFInfo
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- CN207740024U CN207740024U CN201721526658.1U CN201721526658U CN207740024U CN 207740024 U CN207740024 U CN 207740024U CN 201721526658 U CN201721526658 U CN 201721526658U CN 207740024 U CN207740024 U CN 207740024U
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- rod
- pressure
- casing
- steel ball
- relieving achor
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- 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 title claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 claims description 50
- 239000010959 steel Substances 0.000 claims description 50
- 239000007769 metal material Substances 0.000 claims description 11
- 238000009434 installation Methods 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 2
- 238000000338 in vitro Methods 0.000 claims 1
- 230000008093 supporting effect Effects 0.000 abstract description 38
- 239000011435 rock Substances 0.000 abstract description 31
- 238000005553 drilling Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 230000003245 working effect Effects 0.000 abstract description 3
- 230000002265 prevention Effects 0.000 abstract description 2
- 230000006870 function Effects 0.000 description 13
- 238000005520 cutting process Methods 0.000 description 8
- 238000010008 shearing Methods 0.000 description 5
- 238000004873 anchoring Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009993 protective function Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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- Piles And Underground Anchors (AREA)
Abstract
The utility model is related to the mooring rod technique fields in roadway support, in particular to a kind of pressure-relieving achor bar.The utility model discloses a kind of pressure-relieving achor bar, including the body of rod, the casing that is set in outside the body of rod and screens ring.One end of casing is equipped with pallet.Screens ring is used for engaging of the casing with the body of rod.The pressure-relieving achor bar includes the body of rod being relatively fixed in drilling, the casing being set in outside the body of rod and the screens ring being embedded between casing and the body of rod.The pressure-relieving achor bar device can provide high steady resistance, big stroke yield supporting for roadway surrounding rock, be suitable for large deformation, the stability control of workings subject to dy namic pressure country rock and impulsion pressure diaster prevention and control.
Description
Technical field
The utility model is related to the mooring rod technique fields in roadway support, in particular to a kind of pressure-relieving achor bar device.
Background technology
For having the characteristics that high-ground stress and the big difficult supported laneway of rock deformation, supporting construction not only need high-strength branch
Support force, it is also desirable to have the characteristics of yield supporting.
Although at present there are many pressure-relieving achor bar, these anchor poles more or less exist a little insufficient.
Such as：Using the pressure-relieving achor bar for the flexible deformation that constant-resistance device generates, supporting power slightly has deficiency, it is difficult to resist dynamic pressure
Under the influence of country rock large deformation.
Surrouding rock deformation is resisted using the active force of multistage bolt failure by shear process generation, although supporting power is carried
Height, but since there are gaps in multistage bolt, it is difficult to surrouding rock deformation is realized and stablizes supporting.
To sum up, existing pressure-relieving achor bar technology is primarily present the problem that supporting is unstable and intensity is not high.
Utility model content
The purpose of this utility model is to provide a kind of pressure-relieving achor bar, what which was designed using the utility model
The mechanical device that steel ball in the body of rod of the anchor pole, casing and screens ring is formed, has the function of the yield supporting of anchor pole.When
The body of rod axle power of anchor pole, which does not reach setting, allows pressure limiting value, the body of rod of anchor pole to be blocked by the steel ball in screens ring with casing, and two
The changing of the relative positions does not occur for person, this stage pressure-relieving achor bar and conventional anchor pole are identical to the protective function of roadway surrounding rock.When in pressure-relieving achor bar
Axle power reach setting allow pressure limiting value (generally 80% or so of the body of rod ultimate strength of anchor pole) when, the steel ball edge in screens ring
Plasticity shearing slip occurs for the axially cutting tube wall of anchor pole on the inside of casing, opens yield supporting function.Due to the plasticity of metal material
Flow limit is metastable, so the yield supporting resistance of anchor pole will also keep stablizing at this time.The maximum of the pressure-relieving achor bar
Pressure slip length is allowed to be the distance of two on-slip inner rooms, so pressure stroke can be adjusted.It, should when two anti-skid sheaths lean
Anchor pole will restore the function of conventional anchor pole.
Therefore, which has high steady resistance yield supporting characteristic, can adapt to difficult supported laneway country rock large deformation and
Dynamic pressure acts on.Specially：In the roadway surrounding rock small deformation stage, anchor pole can provide Support Resistance that is timely and stablizing, safeguard country rock
Stability；When country rock is acted on by dynamic pressure or generates large deformation, which has the mechanical performance of high steady resistance yield supporting, can tie up
Protect surrounding rock supporting stability, avoid occur anchor pole fracture etc. supportings fail.Furthermore it is also possible to by adjusting casing
Length changes the distance of yield supporting, improves the scope of application of the pressure-relieving achor bar.
What the embodiments of the present invention were realized in：
The body of rod；
One end of the casing being set in outside the body of rod, casing is equipped with pallet；
And screens ring, screens ring are used for engaging of the casing with the body of rod.
The pressure-relieving achor bar includes the body of rod being relatively fixed in drilling, the casing being set in outside the body of rod and is embedded in casing
Screens ring between the body of rod.
Engage the body of rod and casing by the steel ball in screens ring, the body of rod is made to be united with casing.In the rockbolt installation
At the beginning of, before anchor axial force does not reach and allows pressure limiting force, supporting mechanism is identical as conventional anchor pole；When anchor axial force reaches
Allow pressure ultimate resistance when, which allows unlatching the steel ball in pressure function namely screens ring can be along the bolt shaft of internal surface of sleeve pipe
To sliding, mechanism is：The second anti-skid sheath being fixed on the body of rod squeezes steel ball, and the power of steel ball Casing-Cutting inner wall is made to reach it
The plastic strength limit forms Plastic Flow sliding, the anchor pole is made to be in yield supporting state；When the second anti-skid sheath and the first on-slip
When set supports conjunction, the anchor pole is again identical as conventional anchor pole.Therefore, which has the function of high steady resistance yield supporting, can safeguard tunnel
Surrounding rock stability when large deformation and dynamic pressure.
In a kind of embodiment of the utility model：
Screens ring includes that several steel balls and can inlay the steel ball sleeve of steel ball, and is steel ball in steel ball sleeve in the body of rod and set
Snap-in function is played between pipe.
In a kind of embodiment of the utility model：
The strength degree and yield limit of steel ball sleeve are more than the strength degree and yield limit of the body of rod；
The strength degree and yield limit of the body of rod are more than the strength degree and yield limit of casing.
In a kind of embodiment of the utility model：
The body of rod and casing are made of metal material.
In a kind of embodiment of the utility model：
Intermediate incline is formed at the exposed mouth of pallet, and screens ring is embedded in when for initially installing anchor pole.
In a kind of embodiment of the utility model：
Casing and pallet coadunation or integrated molding.
In a kind of embodiment of the utility model：
Inner wall of the casing far from pallet one end is equipped with the first anti-skid sheath；
Outer wall of the body of rod close to pallet one end is equipped with the second anti-skid sheath, which is nut, passes through body of rod outer end
It is threadably mounted on the body of rod, and anchor pole can be made to obtain just by tightening nut and squeezing the steel ball in screens ring in rockbolt installation
Beginning anchor force；
First anti-skid sheath is for the steel ball in screens ring after plasticity shearing (cutting tube wall) flowing occurs for internal surface of sleeve pipe
With the second anti-skid sheath against to prevent the body of rod of pressure-relieving achor bar from being detached with casing；
The body of rod axis of anchor pole when along the inner wall of casing plasticity shearing (cutting tube wall) sliding occurs for the steel ball in screens ring
Power (allow pressure resistance) be gap between the strength of materials and the body of rod and casing by casing, steel ball diameter, steel ball arrangement
(including steel ball number) is determined；Generally its axle power (allow pressure resistance) is set in 80% or so of the lever strength of anchor pole.
In a kind of embodiment of the utility model：
First anti-skid sheath and the second anti-skid sheath are made of metal material.
The technical solution of the utility model at least has the advantages that：
Pressure-relieving achor bar provided by the utility model has using the mechanical system of the body of rod, casing and screens the ring composition of anchor pole
The function of yield supporting can be used for the complex deformation state of supported laneway large deformation and dynamic pressure, its surrouding rock deformation control of high maintenance
The stability of system.Specifically, at the rockbolt installation initial stage, the body of rod and casing of anchor pole are stuck by the steel ball in screens card, therefore
This stage has the same function of conventional anchor pole；The anchor pole can be continuously increased with surrouding rock deformation, axle power, be set when its axle power increases to
It is fixed allow pressure resistance when, screens steel ball slides along the axially cutting tube wall of internal surface of sleeve pipe anchor pole, and anchor pole enters yield supporting shape
State；When the second anti-skid sheath and the first anti-skid sheath, which occur to support, to be closed, which restores conventional anchor pole function again.Due to metal material
Plastic limit intensity is relatively stable, so the plastic limit resistance of steel ball resistance to compression cutting tube wall is relatively stable, we
It, which can be set, allows pressure resistance as 80% or so of anchor rod ultimate intensity, then the anchor pole can provide stable high yield supporting resistance,
Adapt to large deformation and the control of workings subject to dy namic pressure surrounding rock stability.Furthermore it is also possible to adjust the length of casing, the model of yield supporting is adapted to
It encloses.
Description of the drawings
It, below will be to required use in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is the structural schematic diagram of pressure-relieving achor bar in the utility model embodiment；
Fig. 2 is the structural schematic diagram of the body of rod in the utility model embodiment；
Fig. 3 is the enlarged diagram at IV in Fig. 1；
Fig. 4 is the structural schematic diagram of anchoring section in the utility model embodiment.
Icon：200- pressure-relieving achor bars；The 210- bodies of rod；220- casings；221- pallets；The first anti-skid sheaths of 222-；212- second
Anti-skid sheath；300- roadway surrounding rocks；310- anchoring sections；230- screens rings；231- steel ball sleeves；232- steel balls.
Specific implementation mode
It is new below in conjunction with this practicality to keep the purpose, technical scheme and advantage of the utility model embodiment clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described.Obviously, it is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Usually here described in attached drawing and
The component of the utility model embodiment shown can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiments of the present invention to providing in the accompanying drawings is not intended to limit requirement below
The scope of the utility model of protection, but it is merely representative of the selected embodiment of the utility model.Based in the utility model
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained without creative efforts, all
Belong to the range of the utility model protection.
It should be noted that：Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent attached drawing in a attached drawing.
In the description of the utility model embodiment, it should be noted that the orientation of the instructions such as term "inner", "lower" or
Position relationship be based on the orientation or positional relationship shown in the drawings or the utility model product using when the side usually put
Position or position relationship, are merely for convenience of describing the present invention and simplifying the description, do not indicate or imply the indicated device
Or element must have a particular orientation, with specific azimuth configuration and operation, therefore should not be understood as to the utility model
Limitation.In addition, term " first ", " second " etc. are only used for distinguishing description, it is not understood to indicate or imply relative importance.
In the description of the utility model embodiment, it is also necessary to which explanation is unless specifically defined or limited otherwise,
Term " setting ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, can be directly connected, can also can be indirectly connected through an intermediary two elements
Internal connection.For the ordinary skill in the art, above-mentioned term can be understood in the utility model with concrete condition
In concrete meaning.
Embodiment
The utility model provides a kind of pressure-relieving achor bar 200, the anchor pole which is designed using the utility model
The body of rod 210, the yield supporting that has the function of of the mechanical device that forms of casing 220 and screens ring 230, be suitable for supporting large deformation
With the complex deformation state of workings subject to dy namic pressure country rock 300, impulsion pressure occurs for the stability and prevention country rock of deformation controlling for rock surrounding gateways.
It please refers to Fig.1 and Fig. 2, Fig. 1 and Fig. 2 shows the concrete structures of the pressure-relieving achor bar 200 provided in embodiment.
As can be seen that the pressure-relieving achor bar 200 includes the body of rod 210, casing 220 and screens ring 230 from Fig. 1 and Fig. 2.
Wherein, the casing 220 being set in outside the body of rod 210, and one end of casing 220 is equipped with pallet 221.
Further, in the present embodiment, it please refers to Fig. 3 and combines figure and Fig. 2, screens ring 230 includes 231 He of steel ball sleeve
Steel ball 232, steel ball 232 is used for the engaging of casing 220 and the body of rod 210 in steel ball sleeve 231.Casing 220 is made by this engaging
It is unified into an entirety with the body of rod 210.
It after the rockbolt installation is good, is deformed with roadway surrounding rock 300, the axle power in the body of rod 210 of anchor pole can incrementally increase, bar
Contact squeeze power between 220 three of body 210, steel ball 232 and casing also increases therewith, but is not reaching the contact failure limit
Before, three position is relatively fixed, and the changing of the relative positions will not occur, and the supporting characteristic of the anchor pole is identical as conventional anchor pole at this time, with enclosing
Rock deformation further increase, anchor axial force reach setting allow pressure resistance limiting value when, steel ball 232 squeeze cutting tube wall, the body of rod
210 occur the opposite changing of the relative positions with casing 220, and pressure-relieving achor bar 200 is made to enter yield supporting state；When the second anti-skid sheath 212 is with allowing
When pressure sliding supports conjunction to the first anti-skid sheath 222, the anchor pole is again identical as conventional anchor pole protective function.
It should be noted that the pressure-relieving achor bar 200 includes pallet 221, pallet 221 be arranged in the end of casing 220 and
It is bonded with the country rock of foot of hole, when country rock deforms, deforming caused external force can be applied on pallet 221, and
So that the casing 220 of the pressure-relieving achor bar 200 becoming of under the drive of pallet 221, having that the axis along pressure-relieving achor bar 200 moves
Gesture.And when pallet 221 is arranged, integrally formed manufacture may be used with casing 220 in pallet 221.
In addition, in the present embodiment, in order to improve the overall performance of the pressure-relieving achor bar 200, improve the stability of supporting with
And intensity, therefore the structure member of the pressure-relieving achor bar 200 is all made of metal material manufacture.Especially the body of rod 210, casing 220 and
Steel ball sleeve 231 is made of metal material.
Further, in the present embodiment, the strength degree and yield limit of steel ball 232 are more than the intensity pole of the body of rod 210
Limit and yield limit, the strength degree and yield limit of the body of rod 210 are more than the strength degree and yield limit of casing 220.As a result,
Among the body of rod 210, steel ball 232 and casing 220, the strength degree and yield limit of casing 220 are minimum, so,
It allows the pressure stage to be that steel ball 232 squeezes Casing-Cutting 220 in the anchor pole, makes 220 inner wall of casing that local plastic clipping occur and destroy, it should
Anchor pole has the function of that high steady resistance allows pressure.
During use, remote in casing 220 and 210 facing sleeve 220 of the body of rod to prevent pressure-relieving achor bar 200 from falling off
Inner wall from 221 one end of pallet is equipped with the first anti-skid sheath 222, and outer wall of the body of rod 210 close to 221 one end of pallet is equipped with second
Anti-skid sheath 212, the first anti-skid sheath 222 at the end of yield supporting stroke with the second anti-skid sheath 212 for leaning, to play
At the end of yield supporting, the body of rod 210 in pressure-relieving achor bar 200 is avoided to be separated with casing 220.And the first anti-skid sheath 222 and
Second anti-skid sheath 212 is made of metal material.
It please refers to Fig. 4 and in conjunction with Fig. 1-3, the operation principle of the pressure-relieving achor bar 200 is：
Installation:Punching is inserted into that anchor pole, anchoring are upper surely to be hindered casing 220, the ring 230 that is loaded, load onto the second anti-skid sheath 212-
It tightens, squeeze steel ball 232-with initial set initial stage, anchor pole and steady resistance casing 220 by 232 card hole of screens steel ball, with deformation anchor
Bar axle power increases, identical as conventional anchor pole function.
Large deformation dynamic pressure stage, 210 axle power of the body of rod increase to 80% or so 210 intensity of the body of rod, and 232 extruding force of steel ball makes
Yield supporting is opened in hair plastic yielding deformation, the flowing of 232 shearing slip of steel ball at steady resistance 220 extruding of casing.
Second anti-skid sheath 212 and the first on-slip rope are against yield supporting terminates, and anchor pole is again identical as conventional anchor pole function.
In order to realize that this example quickly can play the role of active support to country rock, it is desirable that the second anti-skid sheath 212 is
Nut structure, and there is the screw thread to match therewith in 210 outer end of the body of rod, after pressure-relieving achor bar 200 is installed into drilling, with anchoring section 310
It is formed, tightens nut in time, squeeze screens ring 230, make anchor pole that there is first anchor-hold.
With the increase of surrouding rock deformation, extruding force is contacted with each other increasingly between the body of rod 210, steel ball 232 and casing 220
Greatly, since the yield strength of steel ball 232 is more than the body of rod 210 and casing 220, and 220 various intensity of casing are minimum between three, institute
Plastic yielding can occur first with the contact position of steel ball 232 with the inner wall of casing 220, generating plasticity shear flow.At this moment, bar
Relative movement in an axial direction is generated between body 210 and casing 220, mechanism is opposite with elongation strain of the anchor pole in the case where stablizing axle power
It answers, forms yield supporting.
Specifically, when country rock occurs small deformation or has the tendency that deformation, the axle power in the body of rod 210 is smaller, is transmitted to
Contact force between three is also small, and Plastic Flow is generated insufficient for 220 inner wall contact position of casing.As country rock further becomes
Shape, contact force constantly increase, and after reaching plastic limit, plasticity shearing takes place with 232 contact position of steel ball in 220 inner wall of casing
Flowing, that is, start yield supporting.For metal material after plasticity shear flow occurs, intensity is high and stablizes, and will not occur to lose suddenly
The effect of high steady resistance yield supporting may be implemented in the phenomenon that effect.The length of casing 220 is the length of yield supporting, according to not
The different requirements that same mining area, different roadway surrounding rocks 300 deform, can adjust the length of yield supporting, have stronger adaptability.
To sum up, the utility model utilizes metal material plasticity shear flow in control 300 large deformation of roadway surrounding rock and dynamic pressure
Dynamic characteristic designs the mechanical system of the body of rod 210, screens ring 230 and casing 220 composition of anchor pole, can realize yield supporting,
Keep high stable resistance, the considerably long distance of yield supporting, for safeguarding 300 large deformation of roadway surrounding rock, preventing tunnel from becoming simultaneously
The accidents such as impulsion pressure, fried side have positive effect to shape energy caused by release suddenly.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (7)
1. a kind of pressure-relieving achor bar, which is characterized in that including：
The body of rod；
One end of the casing being set in outside the body of rod, described sleeve pipe is equipped with pallet；
And screens ring, the screens ring are used for the engaging of described sleeve pipe and the body of rod；
The screens ring includes that several steel balls and can inlay the steel ball sleeve of steel ball, and is steel ball in the steel ball sleeve described
Snap-in function is played between the body of rod and described sleeve pipe.
2. pressure-relieving achor bar according to claim 1, it is characterised in that：
The strength degree and yield limit of the steel ball sleeve are more than the strength degree and yield limit of the body of rod；
The strength degree and yield limit of the body of rod are more than the strength degree and yield limit of described sleeve pipe.
3. pressure-relieving achor bar according to claim 1, it is characterised in that：
The body of rod and described sleeve pipe are made of metal material.
4. pressure-relieving achor bar according to claim 1, it is characterised in that：
Intermediate incline is formed at the exposed mouth of the pallet, and the screens ring is embedded in when for initially installing the anchor pole.
5. pressure-relieving achor bar according to claim 1, it is characterised in that：
Described sleeve pipe and the pallet coadunation or integrated molding.
6. pressure-relieving achor bar according to claim 1, it is characterised in that：
Inner wall of the described sleeve pipe far from described pallet one end is equipped with the first anti-skid sheath；
Outer wall of the body of rod close to described pallet one end is equipped with the second anti-skid sheath, which is nut, passes through the bar
That holds in vitro is threadably mounted on the body of rod, and can be squeezed in the screens ring by tightening the nut in the rockbolt installation
Steel ball and so that anchor pole is obtained initial anchor force；
First anti-skid sheath in the screens ring steel ball along described sleeve pipe inner wall occur plasticity shear flow after with
Second anti-skid sheath is against to prevent the body of rod of the pressure-relieving achor bar from being detached with casing.
7. pressure-relieving achor bar according to claim 6, it is characterised in that：
First anti-skid sheath and second anti-skid sheath are made of metal material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721526658.1U CN207740024U (en) | 2017-11-14 | 2017-11-14 | A kind of pressure-relieving achor bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721526658.1U CN207740024U (en) | 2017-11-14 | 2017-11-14 | A kind of pressure-relieving achor bar |
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| Publication Number | Publication Date |
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| CN207740024U true CN207740024U (en) | 2018-08-17 |
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ID=63115653
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| CN201721526658.1U Active CN207740024U (en) | 2017-11-14 | 2017-11-14 | A kind of pressure-relieving achor bar |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107747500A (en) * | 2017-11-14 | 2018-03-02 | 缪协兴 | A kind of pressure-relieving achor bar |
| CN109915188A (en) * | 2019-04-16 | 2019-06-21 | 中国矿业大学 | A kind of high-strength surely hinder detachable pushes back half davit and wall rock deformation monitoring method |
-
2017
- 2017-11-14 CN CN201721526658.1U patent/CN207740024U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107747500A (en) * | 2017-11-14 | 2018-03-02 | 缪协兴 | A kind of pressure-relieving achor bar |
| CN109915188A (en) * | 2019-04-16 | 2019-06-21 | 中国矿业大学 | A kind of high-strength surely hinder detachable pushes back half davit and wall rock deformation monitoring method |
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Effective date of registration: 20211123 Address after: 210000 2001, building 24, Zhongke innovation Plaza, No.150, pubin Road, Jiangbei new district, Nanjing City, Jiangsu Province Patentee after: Jiangsu Zhengxing Mining Technology Development Co., Ltd Address before: 221000 Room 501, unit 2, Building 29, East dormitory, China University of mining and technology, Quanshan District, Xuzhou City, Jiangsu Province Patentee before: Miao Xiexing |