CN108775253A - A kind of damping energy-absorption anchor rod pallet - Google Patents
A kind of damping energy-absorption anchor rod pallet Download PDFInfo
- Publication number
- CN108775253A CN108775253A CN201810669570.8A CN201810669570A CN108775253A CN 108775253 A CN108775253 A CN 108775253A CN 201810669570 A CN201810669570 A CN 201810669570A CN 108775253 A CN108775253 A CN 108775253A
- Authority
- CN
- China
- Prior art keywords
- tray body
- gasket
- lower metal
- anchor rod
- strength spring
- 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.)
- Pending
Links
- 238000013016 damping Methods 0.000 title claims abstract description 16
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 15
- 229910052751 metal Inorganic materials 0.000 claims abstract description 42
- 239000002184 metal Substances 0.000 claims abstract description 42
- 230000036316 preload Effects 0.000 claims abstract description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 14
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 9
- 239000006260 foam Substances 0.000 claims description 9
- 239000004411 aluminium Substances 0.000 claims description 7
- 239000004033 plastic Substances 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 12
- 238000011068 loading method Methods 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 230000035939 shock Effects 0.000 abstract description 2
- 239000011435 rock Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 7
- 239000000306 component Substances 0.000 description 4
- 238000009527 percussion Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 240000002853 Nelumbo nucifera Species 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 2
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000010721 machine oil Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007789 sealing Methods 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
- E21D21/0086—Bearing plates
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)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
A kind of damping energy-absorption anchor rod pallet, including tray body, the tray body edge is provided with rubber seal, it is provided with through-hole in the middle part of the tray body, the through-hole wall is provided with anchor pole, it is provided with lower metal gasket at the top of the tray body, it is provided with high-strength spring at the top of the lower metal gasket, it is provided with upper metallic gasket at the top of the high-strength spring, it is provided with spring washer at the top of the upper metallic gasket, the anchor pole middle and upper part sequentially passes through lower metal gasket, high-strength spring, upper metallic gasket, spring washer, and anchor pole is located at the external part of spring washer and is provided with pre-load nut；Apparatus of the present invention can distinguish the size of seismic (seismal, the flexible deformation energy-absorbing of high-strength spring is used under the small impact loading of frequently occurred earthquake band, elastic-plastic deformation energy-absorbing is then used under the effect of rarely occurred earthquake heavy shock loads, it can avoid the defect that cannot be reused using plastic deformation energy-absorbing completely, reduce the replacement frequency of anchor rod pallet board body, i.e. primary construction, is used for multiple times.
Description
Technical field
The invention belongs to underground engineering support cushion technique fields, and in particular to a kind of damping energy-absorption anchor rod pallet.
Background technology
Suspension roof support is one of common support reinforcement mode of underground engineering.Anchor pole can be by weak, loosening, unstable rock
On the natural arch of body suspention at an upper portion thereof, the pulling force provided by anchor pole overcomes the gravity of relaxed rockmass to keep balancing.
In the process, on the one hand so that pallet is compressed country rock surface by applying certain torque to nut, provided for anchor pole certain
Pretightning force is diffused into the country rock around anchor pole by pretightning force, pallet, so as to improve country rock stress state inhibit country rock from
Layer, the sliding of structural plane and joint fissure opening, to realize anchor pole active support effect；Another aspect surrouding rock deformation makes
Load acts on pallet, and anchor rod body is transferred loads to by pallet, increases the working resistance of anchor pole, and anchor pole control is made to enclose
The effect of rock deformation is fully played.The underground engineering of suspension roof support is under the crustal stress effect of certain level, supporting
Structure will provide corresponding damping energy-absorbing work(under the premise of meeting static(al) bearing requirements to dynamic loadings such as earthquake loads
Energy.
China is located at two violent earthquake band of the world --- between circum-Pacific seismic belt and Eurasian earthquake zone, by Pacific Ocean plate
The extruding of block, Indian and Philippine Sea plate, Earthquake Fault Zone are extremely developed.Under geological process, although underground engineering
Being compared than superstructure earthquake has certain antidetonation superiority, but its destruction situation is still inevitable, therefore underground engineering branch
The antidetonation and Aseismatic Design of shield are most important.
Geological process belongs to accidental action load, and size, direction, propagation path etc. are uncertain, therefore in the design
It is necessary to distinguish the load of frequently occurred earthquake, rarely occurred earthquake to take targetedly measure.Current existing anchor rod pallet board exists
Country rock is reached resigning energy-absorbing purpose by when dynamic load using plastotype energy absorbing component, so that the energy-absorbing of anchor rod pallet board is designed and does not have
Reusability, energy absorbing component fails only under a dynamic load function；Or using the larger elastic endergonic portion of rigidity
Part, under larger continuous action load excessive accumulation of energy brittle break easily occurs.As application No. is 201610342003.2
It is a kind of disclosed in Chinese patent to be used to have the anchor rod pallet board for allowing and pressing energy-absorbing function in Underground Roadway Bolts supporting, work as anchor rod system
When the intense loadings lotus such as being impacted, a degree of expanding plastic deformation occurs, by plastic deformation and tube wall tearing wave absorption energy consumption,
Plastic deformation takes place in this plastic deformation mode under frequently occurred earthquake effect, and deformation is irrecoverable, i.e., cannot repeat profit
With.A kind of anti-impact energy-absorption anchor rod suitable for deep underground engineering disclosed in Chinese patent application No. is 201520440634.9
Pallet, using composite rubber plate as energy-absorbing cushioning members, the component is preferable to the impact damping effect of horizontal direction, to vertical
Percussion is almost without cushioning effect.A kind of erosion control energy-absorbing anchor disclosed in Chinese patent application No. is 201620411241.X
Lever bracket disk, pressure-bearing gasket is horizontal metal plate, undesirable to the termination point of anchor rod stress spread state of static load, and its energy-absorbing
Core component foamed aluminium board blow-by, objectionable impurities corrodes and influences its long-term mechanical property easily in by underground water.
Invention content
Existing defect in view of the above technology, the present invention propose a kind of damping energy-absorption anchor rod pallet, can be in frequently occurred earthquake lotus
It carries and resists impact load by high-strength spring generation flexible deformation under (small impact load) effect, it is (big in rarely occurred earthquake load
Impact load) act on lower be plastically deformed by dish-shaped foamed aluminium filled trays generation to consume the impact load energy of continuous action
Amount.It is this elasticity with plastic deformation combine damping energy-absorbing mode can avoid anchor rod pallet board under one-shot load action i.e.
The defect of failure makes it that plastic deformation occur under the effect of design load intensity and absorbs energy, improves its service efficiency, i.e., once
Construction, is used for multiple times.
To achieve the goals above, the present invention adopts the following technical scheme that：
A kind of damping energy-absorption anchor rod pallet, including tray body, the tray body edge are provided with rubber seal, the support
Through-hole is provided in the middle part of disk body, the through-hole wall is provided with anchor pole, lower metal gasket is provided at the top of the tray body, described
It is provided with high-strength spring at the top of lower metal gasket, upper metallic gasket, the upper metal are provided at the top of the high-strength spring
It is provided with spring washer at the top of gasket, the anchor pole middle and upper part sequentially passes through lower metal gasket, high-strength spring, upper metal gasket
Piece, spring washer, and anchor pole is located at the external part of spring washer and is provided with pre-load nut.
The tray body includes upper layer dish metal tray and lower metal bottom plate, and the upper layer dish metal tray is under
It is provided with closed-cell aluminum foam filled layer between layer metal base plate.
The diameter of the upper metallic gasket and lower metal gasket is more than the outer diameter of high-strength spring.
The through-hole wall is provided with mechanical lubrication oil reservoir.
The rubber seal is set as resistance to toluene O-ring seal.
The present invention having the beneficial effect that compared with prior art：
1, apparatus of the present invention can distinguish the size of seismic (seismal, under the small impact loading of frequently occurred earthquake band
Using the flexible deformation energy-absorbing of high-strength spring, elastic-plastic deformation energy-absorbing is then used under the effect of rarely occurred earthquake heavy shock loads, it can
The defect that cannot be reused using plastic deformation energy-absorbing completely is avoided, the replacement frequency of anchor rod pallet board body is reduced, saves cost,
I.e. primary construction, is used for multiple times.
2, apparatus of the present invention can be carried out according to used geological conditions and ambient stress high-strength spring specification and
Tray body size, closed-cell aluminum foam filled layer physical and mechanical parameter Secondary Design, with reference to the geological process in engineering location
Loading condition makes the rigidity of high-strength spring and the rigidity of surrounding country rock match, closed-cell aluminum foam filled layer is enable to reach
Energy-absorbing value is designed, to realize the purpose of damping energy-absorbing.
3, the tray body in apparatus of the present invention can be prefabricated in factory process, can be used as common bolt after perfect plasticity deformation
Pallet is continuing with, and the closed-cell aluminum foam in old tray body it is recyclable after again melt foaming reuse, have can return
Receive property, it is environmentally safe.
Description of the drawings
Fig. 1 is apparatus of the present invention overall structure diagram；
Fig. 2 is apparatus of the present invention elastic working stage schematic diagram；
Fig. 3 is to do invention device elastoplasticity working stage schematic diagram；
1- tray bodies, the upper layers 101- dish metal tray, 102- lower metal bottom plates, 103- closed-cell aluminum foam filled layers,
2- rubber seal, 3- through-holes, 4- anchor poles, metal gasket under 5-, 6- high-strength springs, 7- upper metallic gaskets, 8- spring washers,
9- pre-load nuts.
Specific implementation mode
The present invention is described in further detail with reference to the accompanying drawings and examples.
As described in Figure 1, a kind of damping energy-absorption anchor rod pallet, including tray body 1,1 edge of the tray body are provided with rubber
Sealing ring 2, rubber seal 2 make closed-cell aluminum foam filled layer 103 and air and underground water completely cut off, avoid corrosive gas or
Erosion of the liquid to energy-absorbing obturator, extends its service life, and in addition rubber seal 2 can rush to avoid country rock around in power
It hits under load effect and damage is scratched by 1 edge of tray body, 1 middle part of the tray body is provided with through-hole 3, and 3 inner wall of the through-hole is set
It is equipped with anchor pole 4, opposite sliding, 1 top of the tray body occur under the action of dynamic load(loading), between tray body 1 and anchor pole 4
It is provided with lower metal gasket 5,5 top of the lower metal gasket is provided with high-strength spring 6,6 line footpath 2mm of high-strength spring, outside
Diameter 30mm, 6 top of the high-strength spring are provided with upper metallic gasket 7, and lower metal gasket 5 and 7 thickness of upper metallic gasket are
0.3mm, diameter are 40mm, and 7 top of the upper metallic gasket is provided with spring washer 8,8 a diameter of 22mm of spring washer, bullet
Spring washer 8 avoids coming to nothing to ensure the close contact between pre-load nut 9 and upper metallic gasket 7,4 middle and upper part of the anchor pole according to
It is secondary to run through lower metal gasket 5, high-strength spring 6, upper metallic gasket 7, spring washer 8, and anchor pole 4 is located at stretching for spring washer 8
Outlet is provided with pre-load nut 9.
The tray body 1 includes upper layer dish metal tray 101 and lower metal bottom plate 102, upper layer dish metal tray
101 can effectively improve stress spread state of the tray body 1 in dead weight to 9 end of pre-load nut, lower metal bottom
Plate 102 can effectively be bonded supporting country rock, so as to improve the stress state of contact country rock, control the deformation and destruction of country rock, institute
It states and is provided with closed-cell aluminum foam filled layer 103, closed-cell foam between upper layer dish metal tray 101 and lower metal bottom plate 102
Aluminium filled layer 103 can occur plastic deformation under rarely occurred earthquake effect and absorb impact energy, 101 He of upper layer dish metal tray
102 diameter of lower metal bottom plate is 220mm, and the dish-shaped aluminium dish that upper layer dish metal tray 101 is 0.3mm thickness, lower layer's gold
It is the round tablet aluminium dish after 0.3mm to belong to bottom plate 102.
The diameter of the upper metallic gasket 7 and lower metal gasket 5 is more than the outer diameter of high-strength spring 6, makes high-strength spring 6
It is come into full contact between pre-load nut 9, ensures that uniform load transmits.
3 inner wall of the through-hole is provided with mechanical lubrication oil reservoir, ensures sufficient lubrication between anchor pole 4 and 1 through-hole 3 of tray body.
The rubber seal 2 is set as resistance to toluene O-ring seal, 2 line footpath 3.1mm of rubber seal, outer diameter
220mm。
Installation method is the present invention in use, first in 1 through-hole of tray body, 3 inner wall film-coating machine oil；Its
The secondary through-hole 3 that anchor pole 4 is passed through to tray body 1；Finally install successively lower metal gasket 5, high-strength spring 6, upper metallic gasket 7,
Spring washer 8 and pre-load nut 9；Just stubborn pre-load nut 9 makes to be in close contact between anchor pole 4 and each component, after continue to twist and pre-tighten spiral shell
Mother 9 completes installation after applying certain prestressing force to tray body 1, as shown in Figure 1；After installation is complete, apparatus of the present invention enter work
Make state, the elastic endergonic stage under the small Impact Load of frequently occurred earthquake, i.e., when the impact load suffered by anchor pole 4 is smaller, anchor
The high-strength spring 6 of 4 tray body 1 of bar is compressed, and the energy that percussion generates is absorbed using flexible deformation, when impact load unloads
Recoverable force after load, since deformation has restorability, high-strength spring 6 can bear repeat impact load action, such as Fig. 2 institutes
Show；When elastoplasticity energy-absorbing stage under frequently occurred earthquake large impact load action, i.e. impact load suffered by anchor pole 4 are larger or continue
Between it is longer when, 4 tray body 1 of anchor pole enters plastic period, i.e. energy caused by percussion has exceeded high-strength spring 6
The accumulation of energy stage, when relying solely on the compressive deformation of high-strength spring 6 cannot fully absorb, tray body 1 generates plastic deformation, first
The increase of stress before this causes the upper layer dish metal tray 101 of tray body 1 to deform, immediately internal closed pore metallic aluminium filled layer
103 generate plastic deformation, the energy that constant absorption percussion generates, until being compressed completely, as shown in Figure 3.
Claims (5)
1. a kind of damping energy-absorption anchor rod pallet, which is characterized in that including tray body, the tray body edge is provided with rubber seal
Circle, the tray body middle part are provided with through-hole, and the through-hole wall is provided with anchor pole, lower metal is provided at the top of the tray body
Gasket, the lower metal gasket top are provided with high-strength spring, are provided with upper metallic gasket at the top of the high-strength spring, institute
State and be provided with spring washer at the top of upper metallic gasket, the anchor pole middle and upper part sequentially pass through lower metal gasket, high-strength spring, on
Metal gasket, spring washer, and anchor pole is located at the external part of spring washer and is provided with pre-load nut.
2. a kind of damping energy-absorption anchor rod pallet according to claim 1, it is characterised in that：The tray body includes upper layer dish
Shape metal tray and lower metal bottom plate are provided with closed-cell foam between the upper layer dish metal tray and lower metal bottom plate
Aluminium filled layer.
3. a kind of damping energy-absorption anchor rod pallet according to claim 1 and 2, it is characterised in that：The upper metallic gasket and
The diameter of lower metal gasket is more than the outer diameter of high-strength spring.
4. a kind of damping energy-absorption anchor rod pallet according to claim 1, it is characterised in that：The through-hole wall setting is organic
Tool lube layer.
5. a kind of damping energy-absorption anchor rod pallet according to claim 1, it is characterised in that：The rubber seal setting
For resistance to toluene O-ring seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810669570.8A CN108775253A (en) | 2018-06-26 | 2018-06-26 | A kind of damping energy-absorption anchor rod pallet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810669570.8A CN108775253A (en) | 2018-06-26 | 2018-06-26 | A kind of damping energy-absorption anchor rod pallet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108775253A true CN108775253A (en) | 2018-11-09 |
Family
ID=64029516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810669570.8A Pending CN108775253A (en) | 2018-06-26 | 2018-06-26 | A kind of damping energy-absorption anchor rod pallet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108775253A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109296250A (en) * | 2018-11-23 | 2019-02-01 | 江苏铭远杆塔有限公司 | Antidetonation electric power bar |
| CN110344409A (en) * | 2019-07-12 | 2019-10-18 | 中南大学 | A kind of anchor pole anchor head assembly of energy-absorbing damping |
| CN110863500A (en) * | 2019-11-27 | 2020-03-06 | 厦门海石生态环境股份有限公司 | Method for enhancing stability of landslide type side slope of abandoned mine |
| CN111930029A (en) * | 2020-06-01 | 2020-11-13 | 东风延锋汽车饰件系统有限公司 | Promote little suspension panel structure that vibrations feedback experienced |
| CN114934799A (en) * | 2022-07-26 | 2022-08-23 | 华北科技学院(中国煤矿安全技术培训中心) | Resistance-adjustable constant-resistance energy-absorbing anchor rod and using method thereof |
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| CN201679510U (en) * | 2010-04-10 | 2010-12-22 | 中国矿业大学 | Drilling-injecting-anchoring integrated anchor rod |
| US20130004245A1 (en) * | 2010-03-19 | 2013-01-03 | Amir Gharbani | Yielding Spiral Bolt Appendage for a Rock Bolt |
| CN202718693U (en) * | 2012-08-30 | 2013-02-06 | 西安科技大学 | Ring-shaped pressure-buffering shock-absorbing device for support of anchor stock or anchor cable |
| CN103016037A (en) * | 2012-12-28 | 2013-04-03 | 山东大学 | Novel yielding anchor rod elastic round tray for displaying pre-tightening force and use method thereof |
| CN204691804U (en) * | 2015-06-25 | 2015-10-07 | 湖南科技大学 | A kind of anti-impact energy-absorption anchor rod pallet being suitable for deep underground construction |
| CN205743946U (en) * | 2016-05-09 | 2016-11-30 | 辽宁工程技术大学 | A kind of erosion control energy-absorption anchor rod pallet |
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2018
- 2018-06-26 CN CN201810669570.8A patent/CN108775253A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130004245A1 (en) * | 2010-03-19 | 2013-01-03 | Amir Gharbani | Yielding Spiral Bolt Appendage for a Rock Bolt |
| CN201679510U (en) * | 2010-04-10 | 2010-12-22 | 中国矿业大学 | Drilling-injecting-anchoring integrated anchor rod |
| CN202718693U (en) * | 2012-08-30 | 2013-02-06 | 西安科技大学 | Ring-shaped pressure-buffering shock-absorbing device for support of anchor stock or anchor cable |
| CN103016037A (en) * | 2012-12-28 | 2013-04-03 | 山东大学 | Novel yielding anchor rod elastic round tray for displaying pre-tightening force and use method thereof |
| CN204691804U (en) * | 2015-06-25 | 2015-10-07 | 湖南科技大学 | A kind of anti-impact energy-absorption anchor rod pallet being suitable for deep underground construction |
| CN205743946U (en) * | 2016-05-09 | 2016-11-30 | 辽宁工程技术大学 | A kind of erosion control energy-absorption anchor rod pallet |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109296250A (en) * | 2018-11-23 | 2019-02-01 | 江苏铭远杆塔有限公司 | Antidetonation electric power bar |
| CN110344409A (en) * | 2019-07-12 | 2019-10-18 | 中南大学 | A kind of anchor pole anchor head assembly of energy-absorbing damping |
| CN110344409B (en) * | 2019-07-12 | 2024-01-26 | 中南大学 | Energy-absorbing and shock-absorbing anchor rod head device |
| CN110863500A (en) * | 2019-11-27 | 2020-03-06 | 厦门海石生态环境股份有限公司 | Method for enhancing stability of landslide type side slope of abandoned mine |
| CN111930029A (en) * | 2020-06-01 | 2020-11-13 | 东风延锋汽车饰件系统有限公司 | Promote little suspension panel structure that vibrations feedback experienced |
| CN111930029B (en) * | 2020-06-01 | 2023-12-19 | 东风延锋汽车饰件系统有限公司 | Micro-suspension panel structure capable of improving vibration feedback experience |
| CN114934799A (en) * | 2022-07-26 | 2022-08-23 | 华北科技学院(中国煤矿安全技术培训中心) | Resistance-adjustable constant-resistance energy-absorbing anchor rod and using method thereof |
| CN114934799B (en) * | 2022-07-26 | 2022-10-04 | 华北科技学院(中国煤矿安全技术培训中心) | Resistance-adjustable constant-resistance energy-absorbing anchor rod and using method thereof |
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Application publication date: 20181109 |
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