CN111006603B - Steel bar stress strain gauge - Google Patents
Steel bar stress strain gauge Download PDFInfo
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- CN111006603B CN111006603B CN201911350035.7A CN201911350035A CN111006603B CN 111006603 B CN111006603 B CN 111006603B CN 201911350035 A CN201911350035 A CN 201911350035A CN 111006603 B CN111006603 B CN 111006603B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 72
- 239000010959 steel Substances 0.000 title claims abstract description 72
- 239000000835 fiber Substances 0.000 claims abstract description 72
- 230000006698 induction Effects 0.000 claims abstract description 32
- 230000008859 change Effects 0.000 claims description 19
- 230000008054 signal transmission Effects 0.000 claims description 8
- OIGNJSKKLXVSLS-VWUMJDOOSA-N prednisolone Chemical compound O=C1C=C[C@]2(C)[C@H]3[C@@H](O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 OIGNJSKKLXVSLS-VWUMJDOOSA-N 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 claims 1
- 230000004044 response Effects 0.000 abstract description 19
- 230000003014 reinforcing effect Effects 0.000 abstract description 17
- 238000005259 measurement Methods 0.000 abstract description 9
- 238000012544 monitoring process Methods 0.000 abstract description 6
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 19
- 239000013307 optical fiber Substances 0.000 description 9
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
-
- 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
- G01B7/24—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 magnetic properties
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/12—Measuring force or stress, in general by measuring variations in the magnetic properties of materials resulting from the application of stress
- G01L1/127—Measuring force or stress, in general by measuring variations in the magnetic properties of materials resulting from the application of stress by using inductive means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The utility model relates to a steel bar stress strain gauge, including steel bar connecting rod and response sleeve, the steel bar connecting rod passes through go-between and reinforcing bar coaxial coupling, the steel bar connecting rod runs through the setting of response sleeve and laminates at the telescopic internal surface of response, upper portion fiber grating and lower part fiber grating have been placed to response telescopic inner wall longitudinal symmetry, in the outside of upper portion fiber grating and lower part fiber grating, be equipped with the sensitive string with response sleeve fixed connection in the response sleeve, sensitive string is in the tensioning state, still be equipped with the induction coil that is used for responding to sensitive string vibration frequency outside sensitive string, upper portion fiber grating and lower part fiber grating all establish ties there is temperature compensation fiber grating in order to offset the influence of temperature. The invention can realize real-time monitoring and determination, has high measurement precision, high sensitivity, self-checking property, simple structure, low cost and strong anti-interference capability, and can be widely applied to various complex environments.
Description
Technical Field
The application relates to a steel bar stress strain gauge which is applicable to the technical field of engineering measurement.
Background
At present, the reinforcing steel bar in engineering is influenced by factors such as mechanical properties of materials, constant change of external environment and the like, so that the monitoring of the change of stress and strain of the reinforcing steel bar is very difficult. The common reinforcement meter is a measuring instrument for measuring the stress borne by the concrete reinforcement of an engineering building, or is used as an anchor rod stress meter to be buried in a drill hole of bedrock, a side slope and an underground structure hole wall which need to be reinforced. The reinforcing bar meter mainly comprises resistance strain gauge type, differential resistance type, vibrating wire type and the like. The resistance strain gauge type steel bar meter has poor durability and easy creep, the sensitivity of the differential resistance type steel bar meter is low, and meanwhile, the differential resistance type steel bar meter, the vibrating wire type steel bar meter and other types of steel bar meters have serious electromagnetic interference and high insulation requirement, and are not suitable for being used in strong electromagnetic severe environment. The principle of the resistance strain type steel bar meter is that the resistance value changes due to the deformation of the resistance strain gauge under the action of tensile force, so that the steel bar stress is measured, and the resistance strain type steel bar meter cannot be applied to monitoring of the steel bar stress for a long time because the resistance strain gauge is sensitive to temperature, weak in output signal, large in nonlinearity of large strain and the like. The vibrating wire type reinforcing steel bar meter measures the stress of the reinforcing steel bar because the steel wire has different fixed frequencies under the action of different tensions, and generally, the instrument has larger volume, lower precision and slower response speed. These instruments all have the shortcomings of poor stability, easy environmental interference and the like, so that the requirements of the instruments on long-term steel bar monitoring cannot be met.
In the actual engineering, the stress and deformation of the steel bar have very important influence on the whole structure, so that a stress strain gauge with high measurement precision, strong anti-interference capability and simple and convenient structure is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects of the existing reinforcing steel bar meter, and provides a high-precision reinforcing steel bar stress strain gauge which is used in the common engineering environment, has high measurement precision and sensitivity, strong anti-interference capability, simple structure and convenient use, can synchronously monitor the stress strain of reinforcing steel bars in real time, achieves the purpose of monitoring the stress and deformation of the reinforcing steel bars, has the function of self-checking precision, thereby prolonging the service life of the reinforcing steel bar stress strain gauge and having better durability.
According to the application, steel bar stress strain gauge, including steel bar connecting rod and response sleeve, the steel bar connecting rod passes through go-between and reinforcing bar coaxial coupling, the steel bar connecting rod runs through the setting of response sleeve and closely laminating are in response sleeve's internal surface, upper portion fiber grating and lower part fiber grating have been placed to response sleeve's inner wall longitudinal symmetry, in upper portion fiber grating and lower part fiber grating's the outside, be equipped with in the response sleeve with response sleeve fixed connection's sensitive string, sensitive string is in the tensioning state the sensitive string outside still is equipped with and is used for the response sensitive string vibration frequency's induction coil, upper portion fiber grating with lower part fiber grating all establishes ties there is temperature compensation fiber grating in order to offset the influence of temperature.
Preferably, threads are arranged inside the connecting ring, and the connecting ring is detachably connected with the steel bar connecting rod; the upper fiber bragg grating and the lower fiber bragg grating are fixedly adhered in the groove of the induction sleeve; and signal transmission optical fibers are arranged at two ends of the optical fiber grating, and a leading-out wire connected with the signal transmission optical fibers extends out of one end of the optical fiber grating and penetrates out of the induction sleeve.
When the steel bar meter is used, the steel bar connecting rod penetrates through the induction sleeve, then the steel bar is connected with the steel bar connecting rod through the connecting ring, and the steel bar meter can start to work after the outgoing line is connected; when the stress on the steel bar changes, the frequency of the sensitive string changes due to the deformation of the steel bar, the induction coil senses the change, the frequency of the output electric signal changes accordingly, the frequency signal is transmitted to a reading device or a data acquisition system through the outgoing cable, and the stress data can be obtained through conversion.
Wherein the stress value measured by the steel bar stress strain gauge is
In the formula, k is the minimum reading of the steel bar meter, delta F is the variable quantity of the output value of the steel bar stress strain gauge relative to a reference value, b is the temperature correction coefficient of the steel bar meter, and delta lambda isbAs a change in the central wavelength of the reflected light, αfIs the thermal expansion coefficient of the fiber, and ξ is the thermo-optic coefficient of the fiber.
The steel bar stress strain gauge comprehensively utilizes the measurement results of the fiber bragg grating and the sensing string, wherein delta F is the output frequency modulus, namely the variable quantity of the output value of the steel bar gauge measured in real time relative to a reference value is generated by the frequency change of the sensing string sensed by the sensing coil due to the deformation of the steel bar; delta lambdabThe variation of the central wavelength of the reflected light is the variation of the characteristic wavelength of the grating caused by the axial deformation of the reinforcing steel bar sensed by the fiber grating. The measuring result of this application can offset the influence that the temperature was met the measuring stress and strain to the bar meter, has synthesized the measuring result of two kinds of measuring parts of fiber grating and response string simultaneously for measuring result is more accurate, stable, and sensitivity is higher.
Drawings
Fig. 1 is a schematic structural diagram of a rebar stress strain gauge according to the application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
According to the application steel bar stress strain gauge, including connecting rod 4 and response sleeve 10, connecting rod 4 passes through go-between 7 and 5 coaxial coupling of reinforcing bar, and connecting rod 4 runs through response sleeve 10 and sets up and laminate the internal surface at response sleeve 10. The connection ring 7 serves to connect the reinforcing bar connection rod 4 and the reinforcing bar and has threads formed inside both ends thereof in a detachable manner, for example, a mantle fiber connection. The inner diameter of the induction sleeve 10 is the same as the outer diameter of the steel bar connecting rod 4, so that the two can be better and tightly attached.
An upper fiber bragg grating 9 and a lower fiber bragg grating 2 are symmetrically arranged on the inner wall of an induction sleeve 10 from top to bottom, a sensitive string 1 fixedly connected with the induction sleeve through a fixing bolt 3 is arranged in the induction sleeve 10 on the outer side of the fiber bragg grating, the strained sensitive string 1 is used as a sensitive element for sensing the vibration frequency of the reinforcing steel bar and is arranged in parallel to the axial direction of the induction sleeve, and an induction coil 8 for sensing the vibration frequency of the sensitive string is further arranged on the outer side of the sensitive string. The sensitive string can adopt a steel string, the vibration frequency of the steel string is induced by the induction coil 8 and is converted into an electric signal to be output, so that the tension on the steel bar is analyzed and measured, the induction of the induction coil is sensitive, and the measurement precision of the steel bar meter is high.
Preferably, the upper fiber grating 9 and the lower fiber grating 2 are both connected in series with a temperature compensation fiber grating 11 to counteract the effect of temperature. The fiber grating sensitive part is stuck and fixed in the groove of the induction sleeve. And signal transmission optical fibers 6 are arranged at two ends of the fiber bragg grating, and outgoing lines connected with the signal transmission optical fibers extend out of one end of the fiber bragg grating sensitive part and penetrate out of the sensing sleeve.
Preferably, the outer parts of the upper fiber grating 9 and the lower fiber grating 2 are further provided with a protection tube, the fiber gratings are tensioned and fixed in the protection tube, and the fiber gratings are integrally stuck and fixed in the grooves of the induction sleeve. This is because the fiber grating is fragile and easily damaged, and therefore the fiber grating is wrapped with a protective tube so as not to be damaged. And transmitting the signals in the fiber bragg grating to a data acquisition system through a leading-out cable, and analyzing the data to obtain a corresponding strain value.
The invention is designed according to the principles of the fiber grating sensor and the vibrating wire sensor. The fiber grating sensor can measure parameters such as strain, temperature, pressure, displacement, flow rate, liquid level and the like, the sensing principle of the fiber grating sensor is generally based on the change of the measured parameters to cause the change of the grating period and the effective refractive index, so that the characteristic wavelength of the grating is changed, and the parameters are measured by measuring the movement amount of the characteristic wavelength. The vibrating wire sensor is a resonant sensor with a strained metal wire as a sensitive element. After the length of the string is determined, the variation of the natural vibration frequency can represent the magnitude of the tensile force applied to the string, and an electric signal in a certain relation with the tensile force can be obtained through a corresponding measuring circuit.
When the steel bar meter is used, the steel bar connecting rod penetrates through the induction sleeve to enable the lengths of the left and right exposed parts to be approximately the same, then the steel bar and the connecting rod are connected through the connecting ring, and the steel bar meter can start to work after the outgoing line is connected. When the stress on the steel bar changes, the sensitive string is simultaneously subjected to frequency change caused by the deformation of the steel bar, the induction coil senses the change, and the frequency of the output electric signal changes accordingly. The frequency signal is transmitted to a reading device or a data acquisition system through a leading-out cable, and the stress change of the steel bar can be obtained through conversion.
When the outside temperature constant reinforcing bar meter is only under the action of axial stress, the stress sigma and the output frequency modulus delta F have the following linear relation:
σ＝k×ΔF，(ΔF＝F-F0)
wherein, k is the minimum reading of the reinforcing bar meter and has the unit of MPa/kHz2；
Delta F is the variation of the output value of the reinforcing bar meter measured in real time relative to the reference value, and the unit is kHz2；
F-real time measured output value of reinforcing bar meter, unit is kHz2；
F0Reference value of the reinforcing bar meter in kHz2。
In practice, the temperature is not necessarily constant, and the stress when the temperature is measured changes only needs to be added with an output value of the reinforcing steel bar meter caused by the temperature change on the basis of the stress. The output value is generally bxDeltaT, b is a temperature correction coefficient of the steel bar meter, and the unit is MPa/DEG C, and the calibration can be carried out through experimental results; the delta T is the variation of the output value of the reinforcing steel bar meter measured in real time according to the temperature relative to a reference value, and can be calculated according to the temperature compensation fiber grating, and the unit is ℃.
σ＝k×ΔF+b×ΔT
And tensioning the upper fiber bragg grating and the lower fiber bragg grating, fixing the upper fiber bragg grating and the lower fiber bragg grating in the protective tube, and respectively and vertically symmetrically arranging the upper fiber bragg grating and the lower fiber bragg grating on the axis of the induction sleeve. Which is stuck and fixed in the groove of the induction sleeve as a whole. And signal transmission optical fibers are arranged at two ends of the fiber bragg grating, and a lead-out cable connected with the signal transmission optical fibers extends out of one end of the fiber bragg grating sensitive part and penetrates out of the sensing sleeve. Meanwhile, the reinforcing steel bar meter is connected with an unstressed temperature compensation fiber grating in series, so that the influence of temperature on stress and strain measured by the reinforcing steel bar meter can be counteracted, and then all signals are transmitted to a computer.
The axial deformation of the sensing steel bar causes the change of the grating period and the effective refractive index, thereby causing the change of the characteristic wavelength of the grating, and the strain of the steel bar is measured by measuring the movement amount of the characteristic wavelength. In the linear elastic range, the change of the grating period and the strain meet the linear relation, and in addition, the effective refractive index of the fiber core can also change due to the thermal expansion effect and the thermo-optic effect. The change in strain, temperature and center wavelength should be calculated as follows:
Δλb＝(1-Pε)·Δε·λb+(αf+ξ)·ΔT
wherein λ isbIs the central wavelength of the grating and is,
Δλbin order to change the central wavelength of the reflected light,
delta epsilon and delta T are respectively strain and temperature variation,
Pε、αfand xi are the effective elasto-optic coefficient, the thermal expansion coefficient and the thermo-optic coefficient of the optical fiber, respectively.
Because the temperature compensation fiber grating is not acted by force, the delta epsilon in the formula is zero, the temperature variation can be obtained through the variation of the central wavelength of the reflected light,
at this point, the real-time stress results for the rebar are:
according to the formula results, the steel bar stress strain gauge comprehensively utilizes the measurement results of the fiber bragg grating and the sensing string,wherein, the delta F is the frequency modulus of the output, namely the variation of the output value of the reinforcing bar meter measured in real time relative to the reference value is generated by the frequency variation caused by the deformation of the reinforcing bar of the sensitive string sensed by the induction coil; delta lambdabThe variation of the central wavelength of the reflected light is the variation of the characteristic wavelength of the grating caused by the axial deformation of the reinforcing steel bar sensed by the fiber grating. The measuring result of this application can offset the influence that the temperature was met the measuring stress and strain to the bar meter, has synthesized the measuring result of two kinds of measuring parts of fiber grating and response string simultaneously for measuring result is more accurate, stable, and sensitivity is higher.
Meanwhile, whether the stress and the strain of the reinforcing steel bar meter meet the error requirement or not can be checked according to the measured real-time stress and strain of the reinforcing steel bar, and if the error requirement is met, the reinforcing steel bar meter is proved to have no problem and can be normally used. If the instrument is not faulty at this time, since the material of the reinforcing bar is known, according to the formula: sigma ═ E × epsilon at stress sigma0A strain value epsilon can be obtained when the strain value epsilon is known1Similarly, the strain ε0A stress value sigma is obtained when known1. By mixing1、σ1And epsilon0、σ0The accuracy of the reinforcing bar meter can be improved by comparing, and because a series of large data about sigma and epsilon are obtained, the accuracy of the reinforcing bar meter can be greatly improved by analyzing the data, so that accurate values of sigma and epsilon of the reinforcing bar can be obtained.
The working state of the instrument can be known according to the comparison between the measured data and the allowable error, and if the instrument meets the requirement of the working error, the instrument is proved to work normally without being replaced, thereby avoiding unnecessary waste. The instrument has high precision, so that the instrument can be used for technical measurement under different requirements, has wide application range, and can determine whether the instrument can be continuously used according to the error requirement.
The invention can realize real-time monitoring and determination of ultimate tensile stress and strain of the steel bar, has the advantages of high measurement precision, high sensitivity, self-checking property, simple structure, low cost, strong anti-electromagnetic interference capability, long service cycle, wide application range, strong severe weather resistance and the like, and can be widely applied to various complex environments.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (4)
1. A steel bar stress strain gauge is characterized by comprising a steel bar connecting rod and an induction sleeve, wherein the steel bar connecting rod is coaxially connected with a steel bar through a connecting ring, the steel bar connecting rod penetrates through the induction sleeve and is tightly attached to the inner surface of the induction sleeve, an upper fiber grating and a lower fiber grating are symmetrically placed on the inner wall of the induction sleeve from top to bottom, a sensitive string fixedly connected with the induction sleeve is arranged on the outer sides of the upper fiber grating and the lower fiber grating in the induction sleeve, the sensitive string is in a tensioning state, an induction coil used for inducing the vibration frequency of the sensitive string is further arranged on the outer side of the sensitive string, and the upper fiber grating and the lower fiber grating are both connected with a temperature compensation fiber grating in series to offset the influence of temperature; the outer parts of the upper fiber bragg grating and the lower fiber bragg grating are also provided with protective tubes, the fiber bragg gratings are tensioned and fixed in the protective tubes and are integrally stuck and fixed in the grooves of the induction sleeve;
wherein the stress value measured by the steel bar stress strain gauge is
In the formula, k is the minimum reading of the steel bar meter, delta F is the variable quantity of the output value of the steel bar stress strain gauge relative to a reference value, b is the temperature correction coefficient of the steel bar meter, and delta lambda isbAs a change in the central wavelength of the reflected light, αfIs the thermal expansion coefficient of the fiber, and ξ is the thermo-optic coefficient of the fiber.
2. The rebar stress strain gauge of claim 1, wherein threads are formed in the connecting ring, and the connecting ring is detachably connected with the rebar connecting rod.
3. The strain gage of claim 2, wherein the fiber grating has signal transmission fibers at both ends thereof, and the leading-out wire connected to the signal transmission fibers extends out from one end of the fiber grating and out of the sensing sleeve.
4. The steel bar stress strain gauge according to claim 3, wherein when in use, the steel bar connecting rod firstly passes through the induction sleeve, then the steel bar is connected with the steel bar connecting rod by the connecting ring, and the steel bar gauge can start to work after the outgoing line is connected; when the stress on the steel bar changes, the frequency of the sensitive string changes due to the deformation of the steel bar, the induction coil senses the change, the frequency of the output electric signal changes accordingly, the frequency signal is transmitted to a reading device or a data acquisition system through the outgoing cable, and the stress data can be obtained through conversion.
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| CN113237582B (en) * | 2021-04-12 | 2022-11-11 | 机械工业第九设计研究院股份有限公司 | Wall internal stress detection method and detection system for engineering acceptance |
| CN113405648B (en) * | 2021-06-23 | 2024-01-23 | 常州工学院 | Variable stress type vibration sensor |
| CN113532539B (en) * | 2021-07-27 | 2024-01-26 | 安徽理工大学 | Optical fiber sensing system, method and device for simultaneously measuring temperature, strain and pressure |
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| CN2751282Y (en) * | 2004-12-01 | 2006-01-11 | 周国玉 | Steel plate strain meter |
| CN105783751A (en) * | 2014-12-17 | 2016-07-20 | 中国航空工业集团公司沈阳发动机设计研究所 | Method for testing supporting point vector deformation under multi-field coupling |
| CN206223336U (en) * | 2016-08-24 | 2017-06-06 | 江西飞尚科技有限公司 | A kind of reinforcing rib meter for measuring foundation ditch axial force of the supports |
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| CN108151643A (en) * | 2017-12-21 | 2018-06-12 | 北京铁科工程检测中心 | A kind of dynamic data measuring method and device based on vibrating string type sensor |
| CN208672194U (en) * | 2018-10-18 | 2019-03-29 | 广州建安仪器设备有限公司 | A kind of reinforcing rib meter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11248558A (en) * | 1998-03-05 | 1999-09-17 | Nippon Telegr & Teleph Corp <Ntt> | Measuring method for strain distribution |
| DE19919991A1 (en) * | 1999-04-30 | 2000-11-16 | Schaffitzel Juergen | Framed building wall element comes in prefered section with shorter horizontal than vertical legs and interposed insulation and reinforcement in a meter-lengthable design. |
| JP2001055812A (en) * | 1999-08-19 | 2001-02-27 | Tokyo Tekko Co Ltd | Attachment for screw joint |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2751282Y (en) * | 2004-12-01 | 2006-01-11 | 周国玉 | Steel plate strain meter |
| CN105783751A (en) * | 2014-12-17 | 2016-07-20 | 中国航空工业集团公司沈阳发动机设计研究所 | Method for testing supporting point vector deformation under multi-field coupling |
| CN206223336U (en) * | 2016-08-24 | 2017-06-06 | 江西飞尚科技有限公司 | A kind of reinforcing rib meter for measuring foundation ditch axial force of the supports |
| CN207066651U (en) * | 2017-07-13 | 2018-03-02 | 宁波冶金勘察设计研究股份有限公司 | Reinforcing rib meter |
| CN108151643A (en) * | 2017-12-21 | 2018-06-12 | 北京铁科工程检测中心 | A kind of dynamic data measuring method and device based on vibrating string type sensor |
| CN208672194U (en) * | 2018-10-18 | 2019-03-29 | 广州建安仪器设备有限公司 | A kind of reinforcing rib meter |
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