CN206319317U - Suitable for rock side slope supporting and the intelligent anchor cable system of monitored over time - Google Patents
Suitable for rock side slope supporting and the intelligent anchor cable system of monitored over time Download PDFInfo
- Publication number
- CN206319317U CN206319317U CN201621362587.1U CN201621362587U CN206319317U CN 206319317 U CN206319317 U CN 206319317U CN 201621362587 U CN201621362587 U CN 201621362587U CN 206319317 U CN206319317 U CN 206319317U
- Authority
- CN
- China
- Prior art keywords
- anchor
- steel strand
- strand wires
- dynamometer
- cable
- 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.)
- Withdrawn - After Issue
Links
- 239000011435 rock Substances 0.000 title claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 58
- 239000010959 steel Substances 0.000 claims abstract description 58
- 230000001681 protective effect Effects 0.000 claims abstract description 21
- 238000005553 drilling Methods 0.000 claims abstract description 15
- 125000006850 spacer group Chemical group 0.000 claims abstract description 4
- 239000004519 grease Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 description 11
- 238000010276 construction Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000007569 slipcasting Methods 0.000 description 2
- 210000002435 tendon Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Landscapes
- Piles And Underground Anchors (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
A kind of intelligent anchor cable system for being applied to rock side slope supporting and monitored over time, including Inner bolt head and outer anchor head, it is fixedly connected by steel strand wires therebetween, each steel strand wires are arranged in Inner bolt head, and the inner of each steel strand wires is provided with heading, the first dynamometer is provided between heading and Inner bolt head inner face；First dynamometer is set in steel strand wires periphery, and the cable of the first dynamometer is arranged in corresponding wire guide；Outer anchor head is located at anchor cable drilling outer end, including anchor pier, and anchor pier is close to anchor cable drilling outer wall, and anchor pier lateral surface is sequentially provided with backing plate and anchor slab, and the second dynamometer is provided between backing plate and anchor slab；Steel strand wires sequentially pass through anchor pier, backing plate, the second dynamometer, and outer end is fixed on anchor slab；Positioned at the part of anchor cable bore inner, spacer sleeve is provided with several pulling force sensors to each steel strand wires along its length, and each stretching force sensor external is covered with protective cover, and the cable of tensioning force snesor is passed by protective cover outer end.
Description
Technical field
The utility model belongs to Geotechnical Engineering field, more particularly to a kind of to be applied to rock side slope supporting and whole prison
The novel intelligent anchor cable system of survey.
Background technology
Prestress anchorage cable is currently most common technological means in slope retaining in Geotechnical Engineering, and prestress anchorage cable can be led
It is dynamic to reinforce Rock And Soil, effectively increase Rock Slide Stability safety coefficient, it is ensured that the safety of engineering construction and runtime.For example, typical
Non-bonded anchorage cable structure is as shown in figure 1, its main feature has the following aspects：
1) non-bonding prestress tendon uses non-bending steel cable 1 ', has covered one layer of PE's outside common steel strand wires
Plastic bushing, inside fills butter, can effectively prevent steel strand wires to corrode；
2) due to having one layer of plastic bushing outside steel strand wires, steel strand wires can be moved freely in sleeve pipe, special using this
Property, Inner bolt head 2 ' is installed under the heading of steel strand wires end, when prestressed stretch-draw is carried out, steel strand wires termination is pressed in Inner bolt head
On, it is that Inner bolt head forms compression on rock mass, belongs to pressure anchor cable；
3) anchor cable of application non-bending steel cable, typically all uses the form of construction work of once grouting, with caking property anchor cable phase
Than, non-bonded anchorage cable easy construction, quick, efficiency high, can side slope reinforced in time；
4) there is one layer of plastic sheath because non-bonded anchorage cable is employed outside non-bending steel cable, steel strand wires so that steel strand wires
Stress relief can be carried out with rock mass deformation.
At present, the monitoring of the prestress anchorage cable employed in rock side slope supporting mainly uses the anchor installed in outer anchor head
Rope dynamometer carries out the monitoring of prestressd anchor cable, but is due to the construction work that non-bonded anchorage cable mainly uses once grouting
Skill, just carries out the tensioning of prestress anchorage cable after total length slip casting, prestressed transmission is acted on due to duct frictional resistance, causes deep anchor
Stretching force suffered by rope is less than the stretching force of anchor cable near outer anchor head, and as anchor cable depth is bigger, stretching force is got over suffered by anchor cable
It is small.Therefore, the result that current anchor dynamometer is monitored is difficult the actual working state for reacting prestress anchorage cable.Therefore,
Need a kind of new prestress anchorage cable monitoring device of exploitation badly, can effectively monitor the whole stress deformation of prestress anchorage cable special
Levy, prestress anchorage cable working property, and the deformation of indirect reaction slope rock mass are grasped in time, is the safety and reliability of engineering operation
Important Appreciation gist is provided.
Utility model content
The purpose of this utility model is to provide a kind of suitable for rock side slope supporting and the anchor cable system of monitored over time, its energy
The whole stress deformation of enough steel strand wires to prestress anchorage cable during long service is monitored, and can be taken with actual response anchor cable
Use as a servant the deformation of character and slope rock mass in the range of length of prestress anchor cable.
To achieve the above object, the utility model takes following technical scheme：
It is a kind of that suitable for rock side slope supporting and the intelligent anchor cable system of monitored over time, it includes Inner bolt head and outer anchor head,
Therebetween it is fixedly connected by some steel strand wires, the steel strand wires are arranged with the sleeve pipe of filling anti-corrosive grease, wherein：
The Inner bolt head is located at anchor cable drilling the inner, through provided with some twisted wire holes and wire guide；Each steel strand wires are arranged in pair
In the twisted wire hole answered, and the inner of each steel strand wires is provided with heading, and the first dynamometry is provided between the heading and the Inner bolt head inner face
Meter；First dynamometer is set in the steel strand wires periphery, and the cable of first dynamometer is arranged in corresponding wire guide；
The outer anchor head is located at anchor cable drilling outer end, including anchor pier, and the anchor pier is close to anchor cable drilling outer wall, the anchor pier
Lateral surface is sequentially provided with backing plate and anchor slab, and the second dynamometer is provided between the backing plate and anchor slab；The steel strand wires sequentially pass through the anchor
Pier, backing plate, the second dynamometer, outer end is fixed on the anchor slab；
Positioned at the part of the anchor cable bore inner, spacer sleeve is provided with several pulling force sensors to each steel strand wires along its length,
Each stretching force sensor external is covered with protective cover, and the cable of the tensioning force snesor is passed by the protective cover outer end.
Further, the section of the Inner bolt head and the anchor pier is in isosceles trapezoid.
Further, described Inner bolt head the inner is provided with interior protective cover, the inner of the heading, the first dynamometer and steel strand wires
It is respectively positioned on inside the interior protective cover.
Further, it is provided with outer protective cover on the outside of the anchor pier, the backing plate, the second dynamometer, anchor slab and steel strand wires
Outer end is respectively positioned on inside the outer protective cover.
The beneficial effects of the utility model are：Implemented by of the present utility model, the prestress anchorage cable in slope retaining
A part not exclusively in slope reinforcement measure, and the whole ess-strain of prestress anchorage cable can be carried out using the anchor cable
Monitoring, can also understand the deformation of side slope different depth rock mass in terms of another, so as to really understand answering for side slope
Force deformation, is that anchored slope operation safety proposes important technical support with reliable.
Brief description of the drawings
Fig. 1 is the structural representation of existing non-bonding prestress tendon.
Fig. 2 is the structural representation for the intelligent anchor cable system that the utility model is applied to rock side slope supporting and monitored over time
Figure.
Fig. 3 is the first dynamometer of the intelligent anchor cable system that the utility model is applied to rock side slope supporting and monitored over time
The structural representation at place.
Fig. 4 is the second dynamometer of the intelligent anchor cable system that the utility model is applied to rock side slope supporting and monitored over time
The structural representation at place.
Fig. 5 is that the stretching force for the intelligent anchor cable system that the utility model is applied to rock side slope supporting and monitored over time is sensed
Structural representation at device.
Embodiment
Coordinate accompanying drawing that the utility model is further detailed below, but and be not used to limit of the present utility model
Practical range.
As shown in Fig. 2 the utility model provides a kind of suitable for rock side slope supporting and the intelligent anchor cable body of monitored over time
System, it includes Inner bolt head 1 and outer anchor head 2, is fixedly connected by some steel strand wires 3 therebetween, the steel strand wires 3 are arranged with filling
The sleeve pipe of anti-corrosive grease.
As shown in figure 3, the Inner bolt head 1 is located at the inner of anchor cable drilling 4, through provided with some twisted wire holes 11 and wire guide 12.
Each steel strand wires 3 are arranged in corresponding twisted wire hole 11, and the inner of each steel strand wires 3 is provided with heading 31, the heading 31 and the interior anchor
The first dynamometer 5 is provided between first 1 inner face.First dynamometer 5 is set in the periphery of steel strand wires 3, and first dynamometer 5
Cable be arranged in corresponding wire guide 12.The Inner bolt head 1 is inner to be provided with interior protective cover 13, the heading 31, the first dynamometer 5
It is respectively positioned on the inner of steel strand wires 3 inside the interior protective cover 13, to prevent the inner of heading 31, the first dynamometer 5 and steel strand wires 3
Corroded.
As shown in figure 4, the outer anchor head 2 is located at 4 outer ends of anchor cable drilling, including anchor pier 21, the anchor pier 21 is bored with the anchor cable
The outer wall of hole 4 is close to, and the lateral surface of anchor pier 21 is sequentially provided with backing plate 22 and anchor slab 23, and second is provided between the backing plate 22 and anchor slab 23
Dynamometer 6.The steel strand wires 3 sequentially pass through the anchor pier 21, backing plate 22, the second dynamometer 6, and outer end is fixed on the anchor slab 23.Enter
One step, the section of the Inner bolt head 1 and the anchor pier 21 is in isosceles trapezoid.In addition, the outside of anchor pier 21 is provided with outer protective cover 24,
The backing plate 22, the second dynamometer 6, the outer end of anchor slab 23 and steel strand wires 3 are respectively positioned on inside the outer protective cover 24, to prevent backing plate
22nd, the outer end of the second dynamometer 6, anchor slab 23 and steel strand wires 3 is corroded.
As shown in figure 5, spacer sleeve is provided with some along its length for part of each steel strand wires 3 inside anchor cable drilling 4
Tensioning force snesor 7, each outer cup of tensioning force snesor 7 is provided with protective cover 71, and the cable of the tensioning force snesor 7 is by the protection
71 outer ends are covered to pass.
The cable of first dynamometer 5 of the present utility model, the second dynamometer 6 and tensioning force snesor 7 is connected to outer anchor head
External equipment, be acquired with the data to the first dynamometer 5, the second dynamometer 6 and tensioning force snesor 7.
The utility model on the basis of novel pre-stressed anchor cable Inner bolt head structure, integrate new prestressing force Inner bolt head by
Anchor head corrosion protection system and monitoring sensing inside and outside the whole stress deformation monitoring technology of power monitoring device, steel strand wires, prestress anchorage cable
Device long durability guard technology, forms new intelligent prestress anchor cable system, prestress anchorage cable can be taken for a long time
The whole stress deformation of steel strand wires during labour is monitored, on the one hand can be with actual response anchor cable military service character, on the other hand
Deformation of the slope rock mass in the range of length of prestress anchor cable can also be reacted.
The utility model also provides a kind of suitable for rock side slope supporting and the fixation of the intelligent anchor cable system of monitored over time
Method, it comprises the following steps：
A. several pulling force sensors 7 of installation are arranged along its length outside steel strand wires 3 and are tested, and at each
The outside of pulling force sensor 7 is installed by protective cover 71；
B. the steel strand wires 3 for installing tensioning force snesor 7 are carried out in volume rope, the twisted wire hole 11 for penetrating Inner bolt head 1, and inside
First dynamometer 5 is installed between the heading 31 of the inner side end of anchor head 1 and steel strand wires 3, and packages interior protective cover 13；
C., anchor cable is integrally put into anchor cable drilling 4 positioning is installed, the slip casting into anchor cable drilling 4；
D. in anchor cable drilling 4 after grout cures, anchor pier 21 is installed in anchor cable 4 outer walls of drilling, and in the outside of anchor pier 21
Backing plate 22, the second dynamometer 6 and anchor slab 23 are installed successively, and steel strand wires 3 is sequentially passed through anchor pier 21, backing plate 22, the second dynamometry
Meter 6 and anchor slab 23；
E. steel strand wires 3 are carried out with prestressed anchor cable stretching, and writes down the first dynamometer 5, the second dynamometer 6 and stretching force passing
The data that with stretching process produce of the sensor 7 at same time point；
F. the number of 7 devices is sensed according to the first dynamometer 5, the second dynamometer 6 and stretching force collected in stretching process
According to it is determined that monitoring initial value, is used as the initial value in prestress anchorage cable running；
G. the outer end of steel strand wires 3 is fixed on anchor slab 23, checks the first dynamometer 5, the second dynamometer 6 and stretching force sensing
After the cable of device 7, outer protective cover 24 is installed in the outside of anchor pier 21.
In addition, it is above-mentioned suitable for rock side slope supporting and the fixing means of the anchor cable system of monitored over time, also including step
H. prestress anchorage cable diverse location is monitored in real time by the data of the first dynamometer 5, the second dynamometer 6 and tensioning force snesor 7
Stressing conditions.
It is applied to rock side slope supporting and the intelligent anchor cable system of long-term monitored over time designed by the utility model, not only
The branch protective function of normal anchor cable can be realized, and the steel strand wires in anchor cable can also be utilized, steel strand wires in prestress anchorage cable are carried out
Whole stress deformation character monitoring, grasps the running status of prestress anchorage cable during service, and then can utilize these monitorings
Data side slope support system reliability is evaluated.
On the other hand, can using the whole stress deformation character monitoring materials of steel strand wires in obtained prestress anchorage cable
It is whole with reference to the prestressing force that several are new in side slope region to obtain the deformation characteristic of slope reinforcement region rock mass different depth
Anchor cable is monitored, the different depth displacement field of whole rock side slope can be obtained using high-precision differential analysis, so as to utilize the letter
The safe operation state of breath side slope is reliably evaluated.
It is of the present utility model to propose, the problem of current prestress anchorage cable monitoring is solved, makes prestress anchorage cable level monitoring
There is larger lifting.Therefore, the utility model patent is applied in actual rock side slope supporting, can obtains significant
Economic benefit and social benefit.
It is pointed out that above-mentioned embodiment is only possible embodiment, it is new in order to which this practicality is expressly understood
The principle of type and propose.Can be in the case of without departing substantially from the utility model principle and scope to above-mentioned reality of the present utility model
The mode of applying carries out many and changed and modifications.All such modifications and variations are included in the scope of the utility model announcement, and
And protected by appended claims.
Claims (4)
1. a kind of suitable for rock side slope supporting and the intelligent anchor cable system of monitored over time, it includes Inner bolt head and outer anchor head, two
It is fixedly connected between person by some steel strand wires, the steel strand wires are arranged with the sleeve pipe of filling anti-corrosive grease, it is characterised in that：
The Inner bolt head is located at anchor cable drilling the inner, through provided with some twisted wire holes and wire guide；Each steel strand wires are arranged in corresponding
In twisted wire hole, and the inner of each steel strand wires is provided with heading, and the first dynamometer is provided between the heading and the Inner bolt head inner face；Should
First dynamometer is set in the steel strand wires periphery, and the cable of first dynamometer is arranged in corresponding wire guide；
The outer anchor head is located at anchor cable drilling outer end, including anchor pier, and the anchor pier is close to anchor cable drilling outer wall, on the outside of the anchor pier
Face is sequentially provided with backing plate and anchor slab, and the second dynamometer is provided between the backing plate and anchor slab；The steel strand wires sequentially pass through the anchor pier, pad
Plate, the second dynamometer, outer end is fixed on the anchor slab；
Positioned at the part of the anchor cable bore inner, spacer sleeve is provided with several pulling force sensors, each to each steel strand wires along its length
Pulling force sensor outer cup is provided with protective cover, and the cable of the tensioning force snesor is passed by the protective cover outer end.
2. according to claim 1 suitable for rock side slope supporting and the intelligent anchor cable system of monitored over time, its feature exists
In：The section of the Inner bolt head and the anchor pier is in isosceles trapezoid.
3. it is according to claim 1 or 2 suitable for rock side slope supporting and the intelligent anchor cable system of monitored over time, its feature
It is：Described Inner bolt head the inner is provided with interior protective cover, and the inner of the heading, the first dynamometer and steel strand wires is respectively positioned on the interior guarantor
Inside shield.
4. according to claim 3 suitable for rock side slope supporting and the intelligent anchor cable system of monitored over time, its feature exists
In：It is provided with outer protective cover on the outside of the anchor pier, the backing plate, the second dynamometer, that the outer end of anchor slab and steel strand wires is respectively positioned on this is outer
Inside protective cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621362587.1U CN206319317U (en) | 2016-12-13 | 2016-12-13 | Suitable for rock side slope supporting and the intelligent anchor cable system of monitored over time |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621362587.1U CN206319317U (en) | 2016-12-13 | 2016-12-13 | Suitable for rock side slope supporting and the intelligent anchor cable system of monitored over time |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206319317U true CN206319317U (en) | 2017-07-11 |
Family
ID=59267618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621362587.1U Withdrawn - After Issue CN206319317U (en) | 2016-12-13 | 2016-12-13 | Suitable for rock side slope supporting and the intelligent anchor cable system of monitored over time |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206319317U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106759318A (en) * | 2016-12-13 | 2017-05-31 | 中国水利水电科学研究院 | Suitable for rock side slope supporting and the intelligent anchor cable system and its fixing means of monitored over time |
| CN108193678A (en) * | 2018-01-24 | 2018-06-22 | 中冶沈勘工程技术有限公司 | The computational methods of rockwork anchor pole interaction boundary spacing and the ultimate pullout capacity computational methods of rockwork anchor pole |
| CN110749495A (en) * | 2019-11-28 | 2020-02-04 | 中国水利水电科学研究院 | Device and method for testing mechanical properties of anchor cable and inner anchor head |
| CN111337178A (en) * | 2020-04-03 | 2020-06-26 | 广西大学 | Polymer strain gauge sensor and intelligent cable manufacturing method |
| CN111442735A (en) * | 2020-04-03 | 2020-07-24 | 广西大学 | Fabrication method of polymer skin fiber grating strain sensor and smart cable |
-
2016
- 2016-12-13 CN CN201621362587.1U patent/CN206319317U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106759318A (en) * | 2016-12-13 | 2017-05-31 | 中国水利水电科学研究院 | Suitable for rock side slope supporting and the intelligent anchor cable system and its fixing means of monitored over time |
| CN108193678A (en) * | 2018-01-24 | 2018-06-22 | 中冶沈勘工程技术有限公司 | The computational methods of rockwork anchor pole interaction boundary spacing and the ultimate pullout capacity computational methods of rockwork anchor pole |
| CN108193678B (en) * | 2018-01-24 | 2019-10-29 | 中冶沈勘工程技术有限公司 | The calculation method of rockwork anchor pole interaction boundary spacing and the ultimate pullout capacity calculation method of rockwork anchor pole |
| CN110749495A (en) * | 2019-11-28 | 2020-02-04 | 中国水利水电科学研究院 | Device and method for testing mechanical properties of anchor cable and inner anchor head |
| CN111337178A (en) * | 2020-04-03 | 2020-06-26 | 广西大学 | Polymer strain gauge sensor and intelligent cable manufacturing method |
| CN111442735A (en) * | 2020-04-03 | 2020-07-24 | 广西大学 | Fabrication method of polymer skin fiber grating strain sensor and smart cable |
| CN111442735B (en) * | 2020-04-03 | 2022-05-31 | 广西大学 | Fabrication method of polymer skin fiber grating strain sensor and smart cable |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206319317U (en) | Suitable for rock side slope supporting and the intelligent anchor cable system of monitored over time | |
| CN106759318B (en) | Intelligent anchor cable system and its fixing means suitable for rock side slope supporting and monitored over time | |
| CN100570067C (en) | Prestressed method of suspension bridge anchoring changeable formula and device | |
| CN205224129U (en) | Single pile basis vertical bearing capacity's experiment detection device | |
| US9963852B2 (en) | Test method for friction resistance at inner and outer sidewalls of pipe pile | |
| CN107655755A (en) | A kind of test method of drag-line cord clip assembly resistant slide bearing capacity | |
| Gage et al. | Validation and implementation of a new method for monitoring in situ strain and temperature in rock masses using fiber-optically instrumented rock strain and temperature strips | |
| CN103215974A (en) | Foundation pile deflection measurement method based on distributed fiber sensing technique | |
| CN108716227A (en) | Analysis method for axial force and displacement distribution of full-length bonded GFRP anti-floating anchor rod | |
| CN114297767B (en) | Active anchoring optimization design method for deep mine excavation slope | |
| Jardine et al. | Axial capacity design practice for North European wind-turbine projects | |
| Kim et al. | Equivalent head-down load vs. Movement relationships evaluated from bi-directional pile load tests | |
| KR100698540B1 (en) | Settlement measuring device and settlement measurement reinforcement system using the same | |
| CN104763001B (en) | A kind of assay device suitable in anchorage cable anchoring section creep properties and test method | |
| CN211037082U (en) | Uplift pile stress and strain automatic monitoring device based on optical fiber sensing technology | |
| CN110514812B (en) | Landslide thrust monitoring and early warning method based on stability coefficient | |
| CN107860496A (en) | Method for testing shear stress on surface of full-length bonded steel bar anchor rod body | |
| CN106906824A (en) | Distribution type fiber-optic prestressing force intellectual monitoring anchor cable | |
| CN204988572U (en) | Skin friction testing arrangement in prefabricated opening concrete pipe pile pile body | |
| CN2510840Y (en) | Single-string respective tension anchoring test apparatus of multi-string steel strand-cable prestressed anchoring rope | |
| KR20100039008A (en) | Measurement system and method for measuring of the same | |
| CN203479435U (en) | Stress testing device for non-metal anti-floating anchor rod body | |
| CN112228155B (en) | Arrangement method and structure of multi-parameter monitoring sensors for overlying rock strata in coal mining subsidence areas | |
| Babu et al. | Soil nails field pullout testing: evaluation and applications | |
| CN207147677U (en) | A kind of Blade fence injection stage force testing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170711 Effective date of abandoning: 20190326 |
|
| AV01 | Patent right actively abandoned |