CN109163651B - Cantilever member disturbance degree measuring device and method based on strain - Google Patents
Cantilever member disturbance degree measuring device and method based on strain Download PDFInfo
- Publication number
- CN109163651B CN109163651B CN201710678180.2A CN201710678180A CN109163651B CN 109163651 B CN109163651 B CN 109163651B CN 201710678180 A CN201710678180 A CN 201710678180A CN 109163651 B CN109163651 B CN 109163651B
- Authority
- CN
- China
- Prior art keywords
- strain
- cantilever member
- measuring
- cantilever
- measuring point
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005259 measurement Methods 0.000 claims abstract description 23
- 238000004364 calculation method Methods 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 abstract description 14
- 238000012545 processing Methods 0.000 abstract description 8
- 230000007547 defect Effects 0.000 abstract description 3
- 238000000691 measurement method Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 101100497221 Bacillus thuringiensis subsp. alesti cry1Ae gene Proteins 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
- G01M5/005—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems
- G01M5/0058—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems of elongated objects, e.g. pipes, masts, towers or railways
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The invention discloses a device and a method for measuring the disturbance degree of a cantilever member based on strain, wherein the measuring device comprises: the one-way strain gauge group is used for measuring strain changes of the upper surface and the lower surface of the cantilever member at the monitoring point; the data acquisition component is used for acquiring measurement data of each monitoring point; and the data processing assembly is used for processing the measured data through a strain-deflection method according to the strain change measured by the unidirectional strain gauge group to obtain a cantilever member deformation curve. The invention can be applied to cantilever structures in any form in building structures and cantilever members such as pre-supporting anchor rods, pipe sheds and the like in tunnel engineering. The invention effectively avoids the inherent defects of the traditional total station fixed point measurement method and the laser ranging method which are limited by the sight line, has higher precision, and can realize the dynamic monitoring of the structural deformation.
Description
Technical Field
The invention relates to the field of measurement of the disturbance degree of cantilever members such as a cantilever beam, an anchor rod, a pipe shed and the like, in particular to a device and a method for measuring the disturbance degree of the cantilever members based on strain.
Background
In engineering design, construction and service processes, the measurement of the deformation of the component is helpful for accurately grasping the stress deformation state of the key part of the component, so that the development trend of the deformation of the component is prejudged, and the safety of the construction process and the reliability of the service stage are ensured. Thus, it is an extremely important task to perform accurate structural measurements.
At present, the main method for measuring the deformation of the component is to use a total station for fixed-point measurement. For example, chinese patent publication No. CN106500651a discloses a method for monitoring geometrical structural deformation safely, which is based on total station measurement results and can obtain structural deformation under different working conditions through certain theoretical conversion, so as to make prejudgment on structural deformation and ensure that the structural deformation is controlled in a corresponding safety range. However, in the actual construction process and even in the normal service stage of the structure, because the sight of the barriers such as the protective net, the temporary supporting member, the templates, the piles and the like is blocked, the deformation measurement by the total station method is greatly restricted, and accurate measurement of the deformation of the component is difficult to realize. The monitoring of building structures by laser ranging is also a monitoring means which is commonly used at the present stage, for example, china patent publication No. CN104949627A discloses a structure deformation measuring system based on laser, and the system can realize the measurement of the deformation of the surface of the structure by arranging a plurality of laser heads and photosensitive bars on the surface of the structure. However, the laser ranging method still cannot break through the restriction of obstruction, and can only measure the linear distance of the deformation of the surface of the structure, and cannot fit the deformation state of the whole component.
Therefore, how to avoid the inherent defects in the monitoring method is to create a structural deformation measuring method with wider applicability, simple operation and good precision, and the method becomes a problem to be solved in the engineering construction process and the service state monitoring.
Disclosure of Invention
The invention aims to provide a device and a method for measuring the deflection of a cantilever member based on strain, which solve the problem that the deformation measurement of the member at the present stage cannot break through the shielding restriction of an obstacle, so that the measurement process is simpler and more convenient, and meanwhile, the device and the method are not influenced and restricted by the working environment.
In order to solve the technical problems, the invention adopts the following technical scheme: a strain-based cantilever member deflection measurement apparatus, comprising:
the one-way strain gauge group is used for measuring strain changes of the upper surface and the lower surface of the cantilever member at the monitoring point;
the data acquisition component is used for acquiring measurement data of each monitoring point;
and the data processing assembly is used for processing the measurement data acquired by the data acquisition assembly through a strain-disturbance method according to the strain change measured by the unidirectional strain gauge group to acquire a cantilever member deformation curve.
The unidirectional strain gauge set includes:
strain gauges;
the support is used for supporting and fixing the strain gauge;
and the signal wire is used for electrically connecting the strain gauge with the data processing component.
The unidirectional strain gauge group further comprises a protective layer, and the assembly formed by the strain gauge, the support and the signal wire is coated.
The number of the strain gauges is more than two; and more than two strain gauges are uniformly distributed in the protection layer, and the distance between two adjacent strain gauges is 0.5m.
Correspondingly, the invention also provides a strain-based cantilever member disturbance degree measuring method, which comprises the following steps of:
1) Before the member is deformed, a unidirectional strain gauge set with enough length is intercepted according to the actual size of the cantilever member, the unidirectional strain gauge set is correspondingly arranged on the upper surface and the lower surface of a measuring point, the unidirectional strain gauge set is aligned and closely stuck on the surface of the cantilever member to be measured, and the initial state of the strain gauge is recorded;
2) After the member is deformed, reading the values of strain gauges on the upper surface and the lower surface of the measuring point, and calculating the average curvature of each section of the cantilever member and the rotation angle of each measuring point;
3) Obtaining the disturbance degree increment of each segment by adopting a strain-disturbance degree change algorithm according to the average curvature of each segment and the rotation angle of the measuring point, and obtaining the disturbance degree value of each measuring point by accumulating the disturbance degree increment of each segment;
4) And fitting a deformation curve of the component based on the disturbance measurement of each measuring point.
In the step 1), the distances between the end of the unidirectional strain gauge set and the fixed and free ends of the cantilever member are all smaller than 0.5m, and the rotation angle, curvature and deflection at the fixed and free ends after the cantilever member is deformed are 0.
In step 2), the mean curvature of each segment of the component is calculated as follows:
wherein,i＝0,1,2,…,n，ε up,i and epsilon down,i The strain values, ρ, measured by the strain gauges on the upper and lower surfaces at the measuring point i i-1 And ρ i Curvature of measuring points at two ends of the ith section respectively; h is a i And n is the number of measuring points, which is the vertical distance between the strain gauges on the upper surface and the lower surface.
In the step 2), the calculation formula of the rotation angle of each measuring point is as follows:wherein, θ i-1 、θ i The corners of the sections at the two ends of the ith section are respectively; l (L) i Is the length of the segment; cantilever member holder the rotation angle of the end is theta 0 ＝0°。
In the step 3), the disturbance degree increment at the measuring point i is calculated as follows:
the calculation formula of the disturbance degree value at the mth measuring point is as follows:
compared with the prior art, the invention has the following beneficial effects: the invention effectively avoids the inherent defects of the traditional total station fixed point measurement method and the laser ranging method which are limited by the sight line, has higher precision, is not influenced by the load distribution mode, and can realize the dynamic monitoring of structural deformation. The invention can be applied to cantilever beam structures in building structures, members such as anchor rods, leading pipe sheds and the like are buried in soil in tunnel engineering construction, deformation monitoring cannot be realized by the traditional means, and the technical problems can be solved by adopting the invention.
Drawings
FIG. 1 is a schematic diagram showing the deformation of the whole structure of a test beam;
FIG. 2 is a schematic diagram showing a partial enlargement at a test point;
fig. 3 is a diagram showing the relationship between strain curvatures.
Detailed Description
As shown in fig. 1-2, an embodiment of the present invention generally includes a unidirectional strain gauge set for measuring strain changes on upper and lower surfaces of a cantilever member at a monitoring point; the data acquisition component is used for collecting measurement data of each monitoring point; a data processing component for processing the acquired measurement data by a strain-disturbance method, and obtaining a cantilever member deformation curve.
Further, the unidirectional strain gauge group consists of a support 11, a strain gauge 12, a signal wire 13 and a protective film 14, wherein the strain gauge is embedded in the support, and the support is fixed on the inner wall of the protective film. When in measurement, the unidirectional strain gauge group with enough length is cut according to the actual size of the detection component, and is closely stuck and fixed on the surface of the cantilever component to be measured, so that the deformation of the component can be monitored. The data acquisition component consists of a data wire 21 and a data acquisition box 22, and is connected with the unidirectional strain gauge group and the data box through the data wire during measurement, so as to collect measurement data in time. The data processing component consists of a computer 31 and a data line 32, and the computer reads the measured data in the data box in time through the data line during measurement and processes the data in time based on a strain-disturbance method.
Aiming at the device, the invention designs a strain-based cantilever member disturbance degree measuring method, which mainly comprises the following steps:
(1) Before the member is deformed, a unidirectional strain gauge set with enough length is cut according to the actual size of the cantilever member, the unidirectional strain gauge set is correspondingly arranged on the upper surface and the lower surface of a measuring point, the unidirectional strain gauge set is aligned and closely adhered to the surface of the cantilever member to be measured, and the initial state of the strain gauge is recorded.
(2) After the component is deformed, the values of strain gauges on the upper surface and the lower surface are read, and the average curvature of each segment and the rotation angle of each measuring point are calculated.
(3) And obtaining the disturbance degree increment of each segment by adopting a strain-disturbance degree change algorithm according to the average curvature of each segment and the rotation angle of the measuring point, and obtaining the disturbance degree value of each measuring point by accumulation.
(4) And fitting a deformation curve of the component based on the disturbance value of each measuring point.
Furthermore, in the step (1), the distance between the end of the unidirectional strain gauge group and the fixed end and the free end of the cantilever member is less than 0.5m, and the rotation angle, curvature and deflection at the fixed support end after the cantilever member is deformed are 0.
Further, the calculation formulas of the curvature and the average curvature at the measuring point in the step (2) are as follows:
epsilon in up,i And epsilon down,i The strain values measured by the upper strain gauge and the lower strain gauge at the measuring point i are respectively ρ i And ρ i-1 The curvatures of the measuring points at the two ends of the ith section are respectively,is the average curvature.
Further, the recursive calculation formula of the rotation angle at the measuring point i in the step (2) is as follows:
in theta i-1 And theta i Respectively the corners of the sections at the two ends of the ith section, l i Is the length of the i-th segment. Wherein the cantilever member is anchored at a supporting endIs the following.
Further, the disturbance degree increment calculation formula at the measuring point i in the step (3) is as follows:
in theta i-1 And theta i Respectively the corners of the sections at the two ends of the ith section, l i Is the length of the i-th segment.
The calculating formula of the disturbance degree value of the mth measuring point of the component is as follows:
in the step (4), fitting of a deformation curve is performed by a difference method based on the disturbance value of each measuring point.
Claims (5)
1. The method for measuring the deflection of the cantilever member based on the strain is characterized by comprising the following steps of:
1) Before the member is deformed, a unidirectional strain gauge set with enough length is intercepted according to the actual size of the cantilever member, the unidirectional strain gauge set is correspondingly arranged on the upper surface and the lower surface of a measuring point, the unidirectional strain gauge set is aligned and closely stuck on the surface of the cantilever member, and the initial state of the strain gauge is recorded;
2) After the cantilever member is deformed, the values of strain gauges on the upper surface and the lower surface of the measuring point are read, and the average curvature of each section of the cantilever member and the rotation angle of each measuring point are calculated;
3) Obtaining the disturbance degree increment of each segment by adopting a strain-disturbance degree change algorithm according to the average curvature of each segment and the rotation angle of the measuring point, and obtaining the disturbance degree value of each measuring point by accumulating the disturbance degree increment of each segment;
4) Fitting a deformation curve of the cantilever member based on the disturbance value of each measuring point;
in step 2), the calculation formula of the average curvature of each section of the cantilever member is as follows:
wherein,ε up,i and epsilon down,i The strain values, ρ, measured by the strain gauges on the upper and lower surfaces at the measuring point i i-1 And ρ i Curvature of measuring points at two ends of the ith section respectively; h is a i And n is the number of measuring points, which is the vertical distance between the strain gauges on the upper surface and the lower surface.
2. The method for measuring the deflection of the cantilever members based on strain according to claim 1, wherein in the step 1), the distances between the ends of the unidirectional strain gauge set and the fixed and free ends of the cantilever members are all smaller than 0.5m, and the deflection, curvature and deflection of the cantilever members at the fixed and free ends after deformation are 0.
3. The method for measuring the deflection of a cantilever member based on strain according to claim 1, wherein in the step 2), the calculation formula of the rotation angle of each measuring point is as follows:wherein θ i-1 、θ i The corners of the sections at the two ends of the ith section are respectively; l (L) i Is the length of the segment; the rotation angle of the cantilever member fixing end is theta 0 ＝0°。
4. The method of claim 3, wherein in step 3), the disturbance degree increment at the measurement point i is calculated as follows:
5. the method of strain-based cantilever member disturbance measurement according to claim 4, wherein,
in the step 3), the calculation formula of the disturbance value at the mth measuring point is as follows:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710678180.2A CN109163651B (en) | 2017-08-10 | 2017-08-10 | Cantilever member disturbance degree measuring device and method based on strain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710678180.2A CN109163651B (en) | 2017-08-10 | 2017-08-10 | Cantilever member disturbance degree measuring device and method based on strain |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109163651A CN109163651A (en) | 2019-01-08 |
| CN109163651B true CN109163651B (en) | 2024-02-02 |
Family
ID=64897050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710678180.2A Active CN109163651B (en) | 2017-08-10 | 2017-08-10 | Cantilever member disturbance degree measuring device and method based on strain |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109163651B (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5983729A (en) * | 1998-06-25 | 1999-11-16 | Taylor; Julian S. | Slender column force transducer |
| JP2000230868A (en) * | 1999-02-10 | 2000-08-22 | Mitsubishi Heavy Ind Ltd | Pressure measuring sensor |
| JP2003194508A (en) * | 2001-12-26 | 2003-07-09 | Mitsubishi Heavy Ind Ltd | Strain measuring method, device and system thereof |
| CN1447092A (en) * | 2003-04-01 | 2003-10-08 | 上海大学 | Device for measuring 3D curve shape and measuring method |
| EP1816432A1 (en) * | 2006-02-06 | 2007-08-08 | Micron Optics, Inc. | Fiber optic strain gage |
| CN101175970A (en) * | 2005-04-15 | 2008-05-07 | 国际壳牌研究有限公司 | Method of arranging strain sensor on cylindrical member |
| CN101285729A (en) * | 2008-06-05 | 2008-10-15 | 天津大学 | An arch bridge deflection measuring device |
| CN101865683A (en) * | 2010-05-26 | 2010-10-20 | 吉林大学 | Dynamic measurement system and method for girder bridge displacement based on strain gauge |
| CN101982724A (en) * | 2010-09-21 | 2011-03-02 | 同济大学 | Online real-time monitoring method for dynamic deflection deformation of wind driven generator blade |
| JP2012018101A (en) * | 2010-07-08 | 2012-01-26 | Kyowa Electron Instr Co Ltd | Strain gauge for measuring hot spot stress and sensor device for measuring hot spot stress |
| CN203744917U (en) * | 2014-01-25 | 2014-07-30 | 重庆大唐科技股份有限公司 | Strain sensor for measuring flexibility of structure |
| CN104457681A (en) * | 2014-09-18 | 2015-03-25 | 合肥工业大学 | Girder structure dynamic deflection monitoring method based on strain mode |
| CN207456373U (en) * | 2017-08-10 | 2018-06-05 | 中南大学 | A kind of cantilever member degree of disturbing measuring device based on strain |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK2037212T3 (en) * | 2007-09-12 | 2016-03-29 | Siemens Ag | Method and sensor device for determining bending and / or load |
-
2017
- 2017-08-10 CN CN201710678180.2A patent/CN109163651B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5983729A (en) * | 1998-06-25 | 1999-11-16 | Taylor; Julian S. | Slender column force transducer |
| JP2000230868A (en) * | 1999-02-10 | 2000-08-22 | Mitsubishi Heavy Ind Ltd | Pressure measuring sensor |
| JP2003194508A (en) * | 2001-12-26 | 2003-07-09 | Mitsubishi Heavy Ind Ltd | Strain measuring method, device and system thereof |
| CN1447092A (en) * | 2003-04-01 | 2003-10-08 | 上海大学 | Device for measuring 3D curve shape and measuring method |
| CN101175970A (en) * | 2005-04-15 | 2008-05-07 | 国际壳牌研究有限公司 | Method of arranging strain sensor on cylindrical member |
| EP1816432A1 (en) * | 2006-02-06 | 2007-08-08 | Micron Optics, Inc. | Fiber optic strain gage |
| CN101285729A (en) * | 2008-06-05 | 2008-10-15 | 天津大学 | An arch bridge deflection measuring device |
| CN101865683A (en) * | 2010-05-26 | 2010-10-20 | 吉林大学 | Dynamic measurement system and method for girder bridge displacement based on strain gauge |
| JP2012018101A (en) * | 2010-07-08 | 2012-01-26 | Kyowa Electron Instr Co Ltd | Strain gauge for measuring hot spot stress and sensor device for measuring hot spot stress |
| CN101982724A (en) * | 2010-09-21 | 2011-03-02 | 同济大学 | Online real-time monitoring method for dynamic deflection deformation of wind driven generator blade |
| CN203744917U (en) * | 2014-01-25 | 2014-07-30 | 重庆大唐科技股份有限公司 | Strain sensor for measuring flexibility of structure |
| CN104457681A (en) * | 2014-09-18 | 2015-03-25 | 合肥工业大学 | Girder structure dynamic deflection monitoring method based on strain mode |
| CN207456373U (en) * | 2017-08-10 | 2018-06-05 | 中南大学 | A kind of cantilever member degree of disturbing measuring device based on strain |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109163651A (en) | 2019-01-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20070069115A1 (en) | Fiber bragg grating sensored segmented deflectometer for ground displacement monitoring | |
| JP2009294039A (en) | Structure deformation monitoring method using distribution type optical-fiber sensing system, and device thereof | |
| CN106441101B (en) | A kind of engineering monitoring high-precision configuration displacement measurement method | |
| CN106679559B (en) | Device and method for actually measuring three-dimensional deformation of interior of ultrahigh earth-rock dam | |
| CN108507526B (en) | Foundation pit deformation measuring device and measuring method thereof | |
| CN113739705B (en) | Component transverse displacement monitoring method based on piecewise arc splicing algorithm | |
| CN111735419B (en) | Slope horizontal displacement monitoring system and method thereof | |
| CN108489449B (en) | Measuring system and method for continuously monitoring tunnel convergence | |
| CN111638027B (en) | High-pier continuous steel bridge displacement monitoring method based on multi-target displacement transmission | |
| CN109163651B (en) | Cantilever member disturbance degree measuring device and method based on strain | |
| CN109443316B (en) | Iron tower inclination state monitoring method and system | |
| CN207456373U (en) | A kind of cantilever member degree of disturbing measuring device based on strain | |
| CN110031325B (en) | Pile body stress testing system and method | |
| CN110849719B (en) | Monitoring method for compression and tensile deformation of stressed rod based on optical fiber sensing technology | |
| TWI788182B (en) | Distributed continuous high-precision two-way displacement optical fiber measurement system and its measurement method | |
| CN116892221A (en) | Multi-point synchronous automatic measurement method for lateral deformation of foundation pit enclosure | |
| CN117433402A (en) | Wearing magnetic grid type three-dimensional deformation monitoring method and system | |
| RU2330238C2 (en) | Device and method for monitoring technical condition of tunnels | |
| Xiao et al. | Distributed fibre optic sensing and novel data processing method for tunnel circumferential deformation–A case study of an ageing tunnel at CERN | |
| CN112431236B (en) | Novel method for judging dangerous points of support piles | |
| CN210603213U (en) | Monitoring device for compression and tensile deformation of stress rod piece based on optical fiber sensing technology | |
| CN115752375A (en) | Assembly type steel column perpendicularity deviation detection device and detection method based on optical fibers | |
| RU2714488C1 (en) | Method and device for measuring deviation of a process channel of a nuclear reactor | |
| CN209894109U (en) | Simple and easy portable three-dimensional deformation monitoring devices | |
| CN105572329A (en) | Concrete crack scale distance adaptive monitoring method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |