CN206959798U - Exploring Loose Rock Country in Tunnels range test system - Google Patents
Exploring Loose Rock Country in Tunnels range test system Download PDFInfo
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- CN206959798U CN206959798U CN201720627462.5U CN201720627462U CN206959798U CN 206959798 U CN206959798 U CN 206959798U CN 201720627462 U CN201720627462 U CN 201720627462U CN 206959798 U CN206959798 U CN 206959798U
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Abstract
The utility model provides a kind of Exploring Loose Rock Country in Tunnels range test system.The Exploring Loose Rock Country in Tunnels range test system includes support bar, distributed sensing optical cable, at least two strain transducers and processor；Wherein, the distributed sensing optical cable and the strain transducer are arranged on the support bar；The support bar is arranged in the drilling in region to be tested；The processor is connected with the distributed sensing optical cable and the strain transducer, the processor is used to gather the strain data in the drilling by the distributed sensing optical cable and the strain transducer, and determines Exploring Loose Rock Country in Tunnels scope according to the strain data.The utility model determines Exploring Loose Rock Country in Tunnels scope, as a result more accurate.
Description
Technical field
It the utility model is related to ore deposit pressure technical field of measurement and test, more particularly to a kind of Exploring Loose Rock Country in Tunnels range test system
System.
Background technology
With the scarcity of superficial part coal resources, coal mining has tended to deepization development, now the ground of " a three high disturbances "
Matter condition make it that especially show the increase of crustal stress causes deformation of the surrounding rock in tunnel to add to deep mining compared with the increase of superficial part complexity
Acute, supporting difficulty increases, STOPE STABILITY reduces, and so as to cause Mine Geological Hazard accident frequently to occur, has a strong impact on mine
Safe and efficient production.Therefore, detection roadway opening, working face adopt caused wall rock loosening ring scope exactly, and tunnel is pacified
Full evaluation and support technology measure formulation etc. has great importance.
In the prior art, can be by static strain testing technology for detection wall rock loosening ring scope, but static strain is surveyed
Examination technology is to be implanted into point type strain detection testing device by drilling, and its acquisition data validity under mal-condition is tested in deep and is difficult to
Ensure.
Therefore, how to improve the accuracy of detection wall rock loosening ring scope is the technology of those skilled in the art's urgent need to resolve
Problem.
Utility model content
The utility model provides a kind of Exploring Loose Rock Country in Tunnels range test system, improves detection wall rock loosening ring scope
Accuracy.
The utility model provides a kind of Exploring Loose Rock Country in Tunnels range test system, applied to such as any one of first aspect
Described method, the system include：
Support bar, distributed sensing optical cable, at least two strain transducers and processor；Wherein, the distributed sensing
Optical cable and the strain transducer are arranged on the support bar；The support bar is arranged in the drilling in region to be tested；Institute
State processor to be connected with the distributed sensing optical cable and the strain transducer, the processor is used to pass through the distribution
Sensing optic cable and the strain transducer gather the strain data in the drilling, and determine that tunnel is enclosed according to the strain data
Rock relaxation zone scope.
Alternatively, the outer wall of the support bar is provided with U-shaped groove, for fix the distributed sensing optical cable and it is described should
Become sensor.
Alternatively, the strain transducer is that point type resistance-type strains unit；The distributed sensing optical cable adds for metal
Strong type base strand straining sensing optical cable.
Alternatively, the support bar includes at least two sections support bar bodies；At least two sections supports bar body is used to adopt
Mode is connect with screw thread or direct insertion pipe to be docked.
Alternatively, the support bar is hollow structure.
Alternatively, at least two strain transducer is set in qually spaced on the support bar.
Alternatively, the support bar is made of polyvinylchloride or three type polypropylene PP-R.
The utility model Exploring Loose Rock Country in Tunnels range test system, by being determined according to the geological information in region to be tested
The information of drilling；Answering for different time is gathered by the distributed sensing optical cable set in the drilling and the sensor
Become data；According to the strain data of collection, Exploring Loose Rock Country in Tunnels scope is determined, it is as a result more accurate.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are
Some embodiments of the utility model, for those of ordinary skill in the art, do not paying the premise of creative labor
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of the embodiment of the utility model Exploring Loose Rock Country in Tunnels range test method one；
Fig. 2 is the drift section testing bore holes artwork of the embodiment of the utility model method one；
Fig. 3 is the schematic diagram of the embodiment of the utility model Exploring Loose Rock Country in Tunnels range test system one；
Fig. 4 is the physical model schematic diagram of the embodiment of the utility model method one；
Fig. 5 a are the strain transducer simulation result figure one of the embodiment of the utility model method one；
Fig. 5 b are the strain transducer simulation result figure two of the embodiment of the utility model method one；
Fig. 5 c are the strain transducer simulation result figure three of the embodiment of the utility model method one；
Fig. 6 a are the distributed sensing optical cable simulation result figure one of the embodiment of the utility model method one；
Fig. 6 b are the distributed sensing optical cable simulation result figure two of the embodiment of the utility model method one；
Fig. 6 c are the distributed sensing optical cable simulation result figure three of the embodiment of the utility model method one.
Embodiment
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, the technical scheme in the embodiment of the utility model is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model part of the embodiment, rather than whole embodiments.Based on the implementation in the utility model
Example, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, is belonged to
The scope of the utility model protection.
The utility model is by distributed fiberoptic sensor and resistance strain using the implanted prosthetics that drills, and is utilized
Encapsulation is sent into design monitoring bore inner with positioning process, carries out the test of hole internal strain multi-parameter comprehensive.Test system can be effective
Monitor failure evolvement process and its strain characteristics change of the roadway surrounding rock caused by exploitation effect.By being arranged in bore inner
Test system, hole internal strain data can be dynamically obtained, form same section different layers position or different section different layers position
Two-dimensional strain data volume, realize that the migration to country rock rock stratum in test zone destroys situation evaluation index, obtain rock mass deformation
Interpretation results and understanding.The set test system can be laid according to changes such as tunnel geologic feature, execution conditions, test purposes and observe
Test device in system and hole, realize data effectively collection and analysis.
Fig. 1 is the schematic flow sheet of the embodiment of the utility model Exploring Loose Rock Country in Tunnels range test method one.Such as Fig. 1 institutes
Show, the method for the present embodiment, applied to Exploring Loose Rock Country in Tunnels range test system as shown in Figure 3, the system includes branch
Strut, distributed sensing optical cable, at least two strain transducers and processor；Wherein, distributed sensing optical cable and the strain
Sensor is arranged on support bar, and methods described includes：
Step 101, the information for determining to drill according to the geological information in region to be tested；Wherein, drill described for setting
Support bar；The information of drilling includes：Bore position, drilling hole amount, bore angle, boring aperture and drilling depth；
Step 102, pass through the strain data of distributed sensing optical cable and sensor the collection different time set in drilling；
Step 103, the strain data according to collection, determine Exploring Loose Rock Country in Tunnels scope.
Specifically, in actual applications, first, build Exploring Loose Rock Country in Tunnels range test system.According to area to be tested
The geological information (such as roadway surrounding rock condition) in domain determines the information of the drilling of relaxation zone scope, wherein the information to drill includes drilling
Angle, boring aperture, drilling depth, bore position, drilling hole amount etc., wherein boring aperture include open pore size, whole hole aperture,
Distributed sensing optical cable and strain transducer are implanted into the borehole.Wherein implantation can use pusher implantation, alternatively,
Bar body docking implantation can be specifically supported by multistage, distributed sensing optical cable and strain transducer are arranged on support bar
On, support bar body is promoted successively, so as to dock in implant bore.Distributed sensing optical cable can have sensing and transfer function concurrently
The measurement that all fronts strain data can be achieved effectively avoids the missing inspection of point sensor；At least two strain transducers can be realized more
The parallel strain data measurement of point.The strain transducer of varying number can be laid according to the position of drilling depth, measurement, formation has
The test system of certain test scope.
The drilling hole amount and bore position of the drift section in region to be tested can flexibly be set according to roadway surrounding rock condition
Count, this is not limited in the utility model embodiment.Testing bore holes are formed using the mode of probing, boring aperture scope is for example
30-45mm.Distributed sensing optical cable and strain transducer are pasted into bar coupling completely by drilling depth using support bar, are fed through hole
Bottom.As shown in Fig. 2 for example drilling 1, drilling 2, drilling n and horizontal angle are respectively 30 degree, 80 degree and 60 degree.
Then, the strain data of distributed sensing optical cable and strain transducer in collection drilling.Distributed sensing optical cable
Strain data collection can be completed by processor such as Time-Domain Technique distributive fiber optic strain monitor, and the harvester is without forming
Loop can realize single-ended measurement, by set collection parameter (such as sampling length be more than drilling depth, sample frequency scope：
10.5GHz~11.5GHz, sample space resolution ratio：0.05m, 0.1m etc.), according to coal seam back production progress and leading infection model
Enclose development continuous monitoring；The collection of strain transducer sensing data, such as can be more by DH3820T surrouding rock deformations by processor
Passage strain monitoring device is completed, and spot measurement, which can be achieved, can also carry out (quasi-distributed) measurement of multiple spot, obtain single drilling and lay
The strain data of length range different depth position.
The strain data obtained is measured according to single measurement and repeatedly, handled accordingly, determine wall rock loosening ring
Scope.
The Exploring Loose Rock Country in Tunnels range test method that the present embodiment provides, passes through the geological information according to region to be tested
It is determined that the information of drilling；Different time is gathered by the distributed sensing optical cable set in the drilling and the sensor
Strain data；According to the strain data of collection, Exploring Loose Rock Country in Tunnels scope is determined, it is as a result more accurate.
Further, alternatively, before step 103, can also include：
The strain data gathered according to the distributed sensing optical cable, generate the position of roadway surrounding rock, the time answers with described
Become the first corresponding relation of data；
The strain data gathered according to the strain transducer, generate position, time and the dependent variable of roadway surrounding rock
According to the second corresponding relation.
Further, step 103, can specifically realize in the following way：
According to the dependent variable threshold of first corresponding relation, second corresponding relation and default wall rock loosening border
Value, determines the Exploring Loose Rock Country in Tunnels scope.
Specifically, in actual applications, the tunnel test single brill of section can be built according to the strain data of single measurement
Hole or the database of multiple borehole strain data.Section coordinate system wherein can be built first for borehole space arrangement, by sky
Between the strain data of coordinate pair single hole distributed sensing optical cable, the strain data of strain transducer carry out library file structure respectively.
And the strain data in the range of each drilling depth is gradually added by different time, corresponding monitor database is formed, that is, is formed
First corresponding relation and the second corresponding relation.
According to roadway surrounding rock primary condition, the test system of each drilling is buried after being formed in tunnel, obtains tunnel
The whole strain data of the strain data of the ambient field of country rock, wall rock loosening change procedure and stationary field, is easy at follow-up data
Reason.
The strain data according to single and repeatedly tested can be handled accordingly, mainly including single strain data and
The processing and utilization of comprehensive strain data.
Further, what the strain data and strain transducer that can also be gathered distributed sensing optical cable gathered answers
Become data to be analyzed, determine the validity of data.
Further, integrated treatment can be carried out strain data the multiple drillings of section.The data of the multiple drillings of section
Section chromatogram can temporally be formed to the strain data of section Change in surrounding rocks process according to space coordinates relation, be easy into
Row contrast in time ＆ on time.Also the variable quantity computing of the strain data of different time country rock section can be carried out, further forms strain
The chromatogram of the variable quantity of data, the borehole strain test result of spatio-temporal distribution can be finally obtained, become for strain data
Change and the evolution of surrouding rock deformation analysis provides foundation.
Further, the strain data for each drilling in section can realize Self-variation compare, section Integrated comparative,
Further with the contrast of view of time measured value, wall rock loosening ring scope is determined, evaluates the stability of section.Its evaluation criterion according to：
1) indoor rock fracture experiment, obtains the discrete approximation data that rock masses fracturing develops under different lithology feature, rock particularly in situ
The pressure break data of sample, so that it is determined that the dependent variable threshold value on wall rock loosening border；2) distribution and change of test process strain data
Feature, its feature are mainly shown as the mutation of numerical value or successional persistently two kinds of change, and wherein Characteristics of Mutation is shown as again
The unexpected increase of strain value, reduces with data acquisition afterwards, is mutated and generally occurs in the larger hard rock of modulus of elasticity.Continuity is held
Continuous strain characteristics then show as strain value with data acquisition consecutive variations, continue to increase or continue to increase after reaching peak value
Persistently diminish again, it changes amplitude influenceing for factor, the company such as is influenceed by working face extraction speed, driving speed, tectonic stress
Continuous property change mostly occurs in the less soft rock of modulus of elasticity.
Finally, with reference to the strain data tested in drilling, formation damage transport conditions around test zone is treated and are divided
Analysis judges, determines the scope of relaxation zone.The determination of relaxation zone is mainly the outlier detection according to strain data, with initial acquisition
Data are background value, and later data is made the difference with background value, are defined higher than background value and less than the data of background value
For Lithosphere deformation generating region, high and low strain abnormality area is judged with reference to detection objective body, explains out-of-the way position, and according to
The size of exceptional value difference is quantitative and the dependent variable threshold ratings rock stratum surrouding rock deformation feature on wall rock loosening border is advised with development
Rule.
Wherein, the dependent variable threshold size on wall rock loosening border is judged, it is necessary to the property and the test back of the body of binding test country rock
Scape carries out comprehensive descision.
The method test convenience that the utility model embodiment provides greatly improves, change conventional point sensor lay,
Implantation and data acquisition modes, distributed and quasi-distributed sensor can effectively avoid missing inspection region, and be strained by single-point
Sensor can be corrected and supplement to the strain data of distributed sensing optical cable, the increase of real time data amount, be improved to be tested
The relaxation zone scope accuracy of identification in region.
Secondly, test adaptability greatly promotes, and distributed sensing optical cable has sensing, transfer function, and transmission range concurrently
Longer error is smaller, survival rate is high, interference is few, goes for more severe detection environment；And because resistance-type strains
The quasi-distributed measurement of sensor, increase data volume indirectly and increase confidence level, ensure test result validity.
Finally, test result expression more optimizes, the data volume that both distributed sensing optical cable and strain transducer gather
It can be mutually authenticated, the unicity and unstability of avoiding method and data.Abundant data body can enrich results expression, present more
First, polymorphic data result, make its expression intuitive, clear, realize the quantitative evaluation of test data, form test result to colliery
Safe and efficient production, protection coal pillar stay set, the supporting in tunnel etc. has important value.
The above method is illustrated below by specific model instance：
1st, model construction：
In order to study migration destruction situation in periphery rock stratum during roadway excavation, indoor scaled physical model is built, is carried out
Research on Correlative Testing for Precision Apparatus.One of important step that physical analogy loosens as research roadway surrounding rock, is laid using said system,
System includes distributed sensing optical cable and strain transducer, and the strain data obtained by two ways can be compared, divide
Analysis, the wall rock loosening feature in tunnel is preferably showed.As shown in figure 4, the physical model size in country rock tunnel is 70cm
The model of × 50cm × 50cm, its tunnel section and Numeric simulation design is square, sizableness in numerical model 1/
400, built using homogeneous sand layers.In view of excavation effect and reality workload, when designing heading sizes,
Its cross section diameter is arranged to 10cm circle,, can when carrying out interpretation of result in the later stage because the drift section of design is circle
Contrasted with the result of numerical simulation, improve the quality and precision of analysis result.Six faces of model are supported with baffle plate, and top is applied
Loading carries, and is filled when roadway position starts with pvc pipe, the digging process in tunnel is the process for extracting pvc pipe, uses PVC
It is because being operated in simulation of excavation process relatively simple that pipe die, which intends roadway excavation,.
2nd, arrangement of measuring-line：
This physical simulation experiment designs three surveys line, i.e. survey line 1, survey line 2, survey line 3 altogether, is disposed with three surveys line
Distributed sensing optical cable and strain transducer, distributing position and the number of distributed cable length and strain transducer are as follows：
The wherein distributed sensing optical cable 20cm of survey line 1,1~No. 5 strain transducer, spacing 5cm；Survey line 2 is distributed to be passed
Sensing optical cable 20cm, 6~No. 10 strain transducers, spacing 5cm；The distributed sensing optical cable 28cm of survey line 3,11~No. 16 strains pass
Sensor, spacing 5cm.Simple stretching and compression are only studied in physical analogy herein, and do not consider the factors such as temperature
Influence, therefore using 1/4 bridge joint mode, without using strain rosette, only carry out simple single strain built-in testing.
3rd, data acquisition：
The test of country rock strain variation uses DH3820T surrouding rock deformation multichannel strain monitoring devices caused by this roadway excavation
With Time-Domain Technique distributive fiber optic strain monitor, simulation test uses 16 strain transducers and 3 distributions for amounting to 2m
Sensing optic cable.During test, multichannel strain monitoring device only carries out simple single strain transducer test without using strain rosette.Survey
Before examination, two ways acquisition parameter is configured.Strain transducer test uses unitary sampling, often clicks on once sampling and presses
Button, monitor just carry out a sampling operation, and sampling number reaches 5 times, are sampled before and after being excavated to three surveys line respectively,
Measurement content elects stress-strain test as, before starting sampling, clicks on balance measuring point, is balanced operation；Distributive fiber optic strain
Monitor equally takes unitary sampling, and primary stress strain testing was carried out every two hours after roadway excavation.
4th, data analysis：
Due to roadway excavation, part strain transducer is caused to be destroyed, preserving preferable strain transducer has ten, and
There is distribution on every survey line, therefore the strained situation of country rock can be analyzed.Wherein, 1~5 it is distributed on survey line 1,6,
9 are distributed on survey line 2, and 11~15 are distributed on survey line 3.Fig. 5 a, Fig. 5 b, Fig. 5 c are three surveys line, each strain transducer institute
Survey the situation of change of strain value, be followed successively by the strain value of 1~No. 5 strain transducer in Fig. 5 a from top to bottom, by Fig. 5 a it is visible 1~
The strain value of No. 5 strain transducers all increases over time, wherein the strain data value changes of No. 1 strain transducer
Most fast and variable quantity is maximum, and other strain transducers are nearer from tunnel, and change is bigger, and more remote from tunnel, the change of strain is more flat
It is slow.The strain value of No. 6 and No. 9 strain transducers is followed successively by Fig. 5 b from top to bottom, 11~15 are followed successively by from top to bottom in Fig. 5 c
The strain value of number strain transducer, the feature of Fig. 5 b, Fig. 5 c performance is similar with Fig. 5 a, but contrasts knowable to three figures, the strain of survey line 1
Value increases to 7000 μ ε from 0, much bigger compared to the μ ε from 0 to 3000 of survey line 2 and the μ ε from 0 to 4000 of survey line 3, shows
The wall rock loosening of back than roadway's sides and tiltedly side it is violent.
There is protection device outside sensing optic cable, therefore any destruction will not occurs in it within the scope of certain external force, from opening
Dig to terminating that data acquisition is complete, now correspond to the position of the corresponding distributed sensing optical cable of patch location extraction of strain transducer
Strain value draw, as shown in Fig. 6 a, Fig. 6 b, Fig. 6 c.
The strain value that the strain value that distributed sensing optical cable gathers gathers with strain transducer is analyzed and can obtained,
Distributed sensing optical cable test result and strain transducer test result are basically identical in error range, therefore distributed sensing
Fiber optic testing result is believable, may be directly applied to roadway surrounding rock and loosens test application study.Can from strain comprehensive analysis
：Country rock strain is compressive strain during roadway excavation, and wherein closely strain variation is maximum for back, reaches 7000 μ
ε, the strain variation away from roadway position is more steady, the half closely changed equivalent to top plate, shows that roadway excavation is main
Roof rock rock stratum is caused to be migrated, destruction amount is larger, and test result and numerical simulation are basically identical.
As shown in figure 3, the Exploring Loose Rock Country in Tunnels range test system of the present embodiment, implements applied to any one as described above
Method described in example, the system include：
Support bar 2, distributed sensing optical cable 3, at least two strain transducers 1 and processor；Wherein, the distributed biography
Sensing optical cable and the strain transducer are arranged on the support bar；The support bar is arranged in the drilling 4 in region to be tested；
The processor is used to gather the strain data in the drilling by distributed sensing optical cable and strain transducer, according to described
Strain data determines Exploring Loose Rock Country in Tunnels scope.
It is further, fixed after support bar is arranged in the drilling in region to be tested on the basis of above-described embodiment
Support bar, designed to the closing of drilling orifice position (closing carries out sealing in hole using synthetic resin or Anchor Agent), during sealing
Injected hole, stop using Grouting Pipe to carrying out slip casting closing, slip casting to hollow support bar aperture in drilling when returning cement mortar, together
When should carry out outside hole test cable protection.
Optionally, it should be noted that two class sensors should support when setting distributed sensing optical cable and the strain transducer
The tube wall homonymy of bar, and ensure that stress is roughly the same.
Further, the outer wall of the support bar is provided with U-shaped groove, for fixing the distributed sensing optical cable and described
Strain transducer.
Further, the strain transducer is that point type resistance-type strains unit；The distributed sensing optical cable is metal
Reinforced base strand straining sensing optical cable.
Further, the support bar includes at least two sections support bar bodies；At least two sections supports bar body is used for
Mode is connect using screw thread or direct insertion pipe to be docked.
Further, the support bar is hollow structure.
Further, at least two strain transducer is set in qually spaced on the support bar.
Further, the support bar is made of polyvinylchloride or three type polypropylene PP-R.
Specifically, the tubing of docking PVC or PP-R materials can be used as support bar, in the thicker side design of outer wall
U-shaped groove, while the pipe for designing screw thread docking or direct insertion docking connects mode, and tubing and pipe spreading degree are chosen and marked
After fixed, distributed optical cable and point type resistance strain are fixed on groove location using annular base band, successively propulsion tube
Material.
Distributed sensing optical cable is metal reinforced base strand straining sensing optical cable, and having sensing and transfer function concurrently can realize
The measurement of all fronts strain data effectively avoids the missing inspection of point sensor；Strain sensing system is high-precision using BF1K-3AA 1K Ω
Spend resistance-type strain unit or using point type embedment strain gauge, wherein point type strain transducer is using waterproof enclosure and by between grade
Gauge realizes multipoint parallel DATA REASONING from laying.
Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：It can still modify to the technical scheme described in foregoing embodiments, either to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical scheme of type.
Claims (7)
- A kind of 1. Exploring Loose Rock Country in Tunnels range test system, it is characterised in that including：Support bar, distributed sensing optical cable, at least two strain transducers and processor；Wherein, the distributed sensing optical cable It is arranged on the strain transducer on the support bar；The support bar is arranged in the drilling in region to be tested；The place Reason device is connected with the distributed sensing optical cable and the strain transducer, and the processor is used to pass through the distributed sensing Optical cable and the strain transducer gather the strain data in the drilling, and determine roadway surrounding rock pine according to the strain data Moving-coil scope.
- 2. system according to claim 1, it is characterised in that the outer wall of the support bar is provided with U-shaped groove, for fixing The distributed sensing optical cable and the strain transducer.
- 3. system according to claim 1 or 2, it is characterised in that the strain transducer is that the strain of point type resistance-type is single Member；The distributed sensing optical cable is metal reinforced base strand straining sensing optical cable.
- 4. system according to claim 1 or 2, it is characterised in that the support bar includes at least two sections support bar bodies； At least two sections supports bar body is used to be connect mode using screw thread or direct insertion pipe and be docked.
- 5. system according to claim 1 or 2, it is characterised in that the support bar is hollow structure.
- 6. system according to claim 1 or 2, it is characterised in that at least two strain transducers spaced set On the support bar.
- 7. system according to claim 1 or 2, it is characterised in that the support bar is by polyvinylchloride or three types Made of polypropylene PP-R.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108843396A (en) * | 2018-06-22 | 2018-11-20 | 华北科技学院 | A kind of top plate disaster monitoring device |
| CN111678548A (en) * | 2020-06-01 | 2020-09-18 | 河北省交通规划设计院 | Safety monitoring method and device for small and medium-span assembled bridge |
| CN112345647A (en) * | 2021-01-05 | 2021-02-09 | 中南大学 | Surrounding rock loosening ring test method |
-
2017
- 2017-06-01 CN CN201720627462.5U patent/CN206959798U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108843396A (en) * | 2018-06-22 | 2018-11-20 | 华北科技学院 | A kind of top plate disaster monitoring device |
| CN108843396B (en) * | 2018-06-22 | 2019-10-08 | 华北科技学院 | A kind of top plate disaster monitoring device |
| CN111678548A (en) * | 2020-06-01 | 2020-09-18 | 河北省交通规划设计院 | Safety monitoring method and device for small and medium-span assembled bridge |
| CN111678548B (en) * | 2020-06-01 | 2022-03-29 | 河北省交通规划设计研究院有限公司 | Safety monitoring method and device for small and medium-span assembled bridge |
| CN112345647A (en) * | 2021-01-05 | 2021-02-09 | 中南大学 | Surrounding rock loosening ring test method |
| CN112345647B (en) * | 2021-01-05 | 2021-04-23 | 中南大学 | Surrounding rock loosening ring test method |
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