CN116659432B - Self-calibration strain sensor for embedded concrete and calibration method - Google Patents
Self-calibration strain sensor for embedded concrete and calibration method Download PDFInfo
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- CN116659432B CN116659432B CN202310952714.1A CN202310952714A CN116659432B CN 116659432 B CN116659432 B CN 116659432B CN 202310952714 A CN202310952714 A CN 202310952714A CN 116659432 B CN116659432 B CN 116659432B
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- 238000004873 anchoring Methods 0.000 claims abstract description 24
- 230000000903 blocking effect Effects 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 239000003921 oil Substances 0.000 claims description 14
- 239000010720 hydraulic oil Substances 0.000 claims description 12
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000001802 infusion Methods 0.000 description 4
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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
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/04—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring the deformation in a solid, e.g. by vibrating string
Abstract
The application provides a self-calibration strain sensor of embedded concrete and a calibration method, belongs to the technical field of structural monitoring, and is used for solving the calibration problem of the strain sensor of embedded concrete. The pre-buried concrete self-calibration strain sensor of this application includes: a sensor assembly, a calibration assembly, and a hydraulic drive assembly. The sensor assembly comprises a sliding sleeve, a vibrating wire strain sensor body, a first anchoring flange and an anchoring sliding block. The calibration assembly comprises a hydraulic cavity, a connecting rod and a resistance spring. A piston is arranged in the hydraulic cavity. The connecting rod is connected between the end faces of the anchor sliding block and the facing blocking edge of the piston. The hydraulic driving assembly is communicated with the hydraulic cavity. The hydraulic driving assembly is used for driving the piston to move in the hydraulic cavity, and then driving the anchoring sliding block to move. The embedded concrete self-calibration strain sensor can calibrate after embedded concrete, and measurement accuracy and reliability are guaranteed.
Description
Technical Field
The application belongs to the technical field of structural monitoring, and particularly relates to a pre-buried concrete self-calibration strain sensor and a calibration method.
Background
The concrete strain sensor includes a surface strain sensor, a buried strain sensor, and the like. The embedded strain sensor is used for measuring the strain of concrete in the structure and is widely applied to civil buildings, industrial buildings, various public facilities and the like. In different facilities, the service cycle of the embedded strain sensor is also different, for example, the service cycle of the embedded strain sensor in a nuclear power station containment and other structures can be up to 60 years, although the embedded strain sensor can be calibrated and calibrated before being embedded into concrete, the accuracy and reliability of the sensor cannot be guaranteed after long-period use, and the sensor cannot be taken out from the concrete for calibration, so that the accuracy of the concrete strain monitoring data cannot be judged at the moment.
Disclosure of Invention
Therefore, the technical problem to be solved by the application is to provide the embedded concrete self-calibration strain sensor and the calibration method, which can solve the calibration problem of the embedded concrete strain sensor, thereby improving the accuracy and the reliability of the embedded concrete strain sensor.
In order to solve the above-mentioned problem, the present application provides a pre-buried concrete self-calibration strain sensor, include: sensor assembly, calibration assembly and hydraulic drive assembly. The sensor assembly comprises a sliding sleeve, a vibrating wire strain sensor body, a first anchoring flange and an anchoring sliding block. The vibrating wire strain sensor body is movably arranged in the sliding sleeve. One end of the vibrating wire strain sensor body extends out of the sliding sleeve and is connected to the first anchoring flange. The anchor slider is connected to one end of the vibrating wire strain sensor body, which is far away from the first anchor flange. The calibration assembly comprises a hydraulic cavity, a connecting rod and a resistance spring. The hydraulic cavity comprises a cylinder body, an end cover and a blocking edge. The end cover is arranged at one end of the cylinder body. The baffle edge is positioned on the inner wall of the cylinder body and is close to one end of the cylinder body far away from the end cover. A piston is arranged in the hydraulic cavity. The connecting rod is connected between the end faces of the anchor sliding block and the facing blocking edge of the piston. The resistance spring is arranged on the connecting rod and connected between the piston and the blocking edge. The hydraulic driving assembly is communicated with the hydraulic cavity. The hydraulic driving assembly is used for driving the piston to move in the hydraulic cavity, and then driving the anchoring sliding block to move.
Optionally, the hydraulic chamber further comprises: and a second anchor flange. The second anchor flange is arranged on the outer peripheral surface of the cylinder body.
Optionally, the hydraulic chamber further comprises: and fixing the sleeve. The fixed sleeve sets up in the one end of keeping away from the end cover of barrel. The sliding sleeve is connected to the fixed sleeve. The anchor slide is located in the fixed sleeve.
Optionally, the hydraulic drive assembly comprises: an electronic micropump and an oil delivery pipe. The electronic micropump includes hydraulic oil. The electronic micro pump is communicated with the hydraulic cavity through an oil delivery pipe.
Optionally, the oil delivery pipe comprises: a first valve and a second valve. The first valve is adjacent to the electronic micropump. The second valve is adjacent to the hydraulic chamber.
Optionally, the pre-embedded concrete self-calibration strain sensor further comprises: a display device. The display device is used for displaying the moving amount of the piston.
Optionally, the pre-embedded concrete self-calibration strain sensor further comprises: and a transfer box. The adapter box is used for accommodating the hydraulic drive assembly.
Alternatively, the stiffness of the resistance spring is k 1 . The rigidity of the steel wire in the vibrating wire strain sensor body is k 2 。k 1 ≥10*k 2 。
The application also provides a calibration method for the self-calibration strain sensor of the embedded concrete, which comprises the following steps:
the hydraulic driving assembly is used for driving the piston to move, so that the anchoring sliding block is driven to move, and the steel wire in the vibrating wire strain sensor body is deformed.
And obtaining the relation between the deformation of the steel string and the movement amount of the piston, thereby performing calibration.
Optionally, the calibration grading is performed.
Advantageous effects
1. When the embedded concrete self-calibration strain sensor provided by the embodiment of the invention is used, firstly, the sensor component and the calibration component are embedded into a designated position of a point to be measured before concrete is poured, and the driving component is left out of the concrete pouring range; when the vibrating wire strain sensor body is required to be calibrated after pouring or in the service process, the driving component can drive the piston of the calibration component to move so as to drive the anchoring sliding block of the sensor component to move, so that the steel wire in the vibrating wire strain sensor body is deformed, and the vibrating wire strain sensor body is calibrated by utilizing a relation curve between the deformation of the steel wire and the movement amount of the piston. The embedded concrete self-calibration strain sensor can calibrate after being embedded into concrete, ensures the accuracy and reliability of strain measurement, can be used for a long time, can calibrate at any time, and is not interfered by natural factors such as wind, snow, rain and the like or vibration factors.
2. The calibration method provided by the embodiment of the invention can calibrate the vibrating wire strain sensor embedded in the concrete at any time, thereby ensuring the accuracy of the vibrating wire strain sensor and prolonging the service life of the vibrating wire strain sensor.
Drawings
Fig. 1 is a schematic structural diagram of a self-calibration strain sensor of pre-buried concrete according to an embodiment of the present application;
FIG. 2 is a schematic structural view of a calibration assembly according to an embodiment of the present application;
FIG. 3 is a schematic view of a hydraulic drive assembly according to an embodiment of the present disclosure;
FIG. 4 is a schematic structural view of a sensor assembly according to an embodiment of the present application;
FIG. 5 is a flow chart of a calibration method according to an embodiment of the present application.
The reference numerals are expressed as:
1. a sensor assembly; 2. calibrating the assembly; 3. a hydraulic drive assembly; 4. a display device; 5. a junction box; 6. concrete; 7. hydraulic oil;
11. a sliding sleeve; 12. a vibrating wire strain sensor body; 13. a first anchor flange; 14. an anchor slide;
121. a steel string;
21. a hydraulic chamber; 22. a piston; 23. a connecting rod; 24. a resistance spring;
211. a cylinder; 212. an end cap; 213. a blocking edge; 214. a second anchor flange; 215. a fixed sleeve;
31. an electronic micropump; 32. an oil delivery pipe; 33. a first valve; 34. and a second valve.
Detailed Description
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
The embodiment provides a pre-buried concrete self-calibration strain sensor. Fig. 1 is a schematic structural diagram of a self-calibration strain sensor for embedded concrete according to the present embodiment. Fig. 2 is a schematic structural diagram of a calibration assembly according to the present embodiment. Fig. 3 is a schematic structural diagram of a hydraulic driving assembly according to the present embodiment. Fig. 4 is a schematic structural diagram of a sensor assembly according to the present embodiment.
As shown in fig. 1 to 4, the self-calibration strain sensor for embedded concrete of this embodiment includes: a sensor assembly 1, a calibration assembly 2 and a hydraulic drive assembly 3. The sensor assembly 1 comprises a sliding sleeve 11, a vibrating wire strain sensor body 12, a first anchor flange 13 and an anchor slide 14. The vibrating wire strain sensor body 12 is movably arranged in the sliding sleeve 11. One end of the vibrating wire strain sensor body 12 extends out of the sliding sleeve 11 and is connected to the first anchor flange 13. The anchor slider 14 is connected to the end of the vibrating wire strain sensor body 12 remote from the first anchor flange 13. The calibration assembly 2 comprises a hydraulic chamber 21, a connecting rod 23 and a resistance spring 24. The hydraulic chamber 21 includes a cylinder 211, an end cap 212, and a flange 213. An end cap 212 is provided at one end of the cylinder 211. The stop edge 213 is located on the inner wall of the barrel 211 near the end of the barrel 211 distal from the end cap 212. A piston 22 is provided in the hydraulic chamber 21. The connecting rod 23 is connected between the anchor slide 14 and the end face of the piston 22 facing the stop edge 213. The resistance spring 24 is provided on the connecting rod 23 and connected between the piston 22 and the blocking rim 213. The hydraulic drive assembly 3 communicates with the hydraulic chamber 21. The hydraulic driving assembly 3 is used for driving the piston 22 to move in the hydraulic cavity 21, so as to drive the anchoring slider 14 to move.
In some examples, as shown in fig. 1, the diameter of the first anchor flange 13 is greater than the outer diameter of the sliding sleeve 11. By doing so, the end of the vibrating wire strain sensor body 12 can be stably anchored in the concrete 6.
In some examples, as shown in fig. 1 and 2, the anchor slide 14 includes a head portion and a stem portion that are connected to each other, the stem portion being connected Yu Zhenxian to an end of the strain sensor body 12 remote from the first anchor flange 13, and the connecting rod being connected to the head portion of the anchor slide 14. So arranged, the connection of the connecting rod 23 with the anchoring slider 14 is facilitated.
In some examples, as shown in fig. 1 and 2, the stiffness of the resistance spring 24 is Yu Zhenxian greater than the stiffness of the steel wire 121 inside the strain sensor body 12, and the maximum pressure exerted by the resistance spring 24 on the piston 22 is less than the driving force of the hydraulic drive assembly 3. By the arrangement, the measuring precision of the vibrating wire strain sensor body 12 can be ensured when the vibrating wire strain sensor body is not calibrated; at calibration, it can be ensured that the hydraulic drive assembly 3 can drive the piston 22 to move in the hydraulic chamber 21.
In some examples, as shown in fig. 1 and 2, the cylinder 211, the end cap 212, and the flange 213 of the hydraulic chamber 21 are integrally formed. So set up, can guarantee the structural strength of hydraulic pressure cavity 21.
When the embedded concrete self-calibration strain sensor provided in the embodiment is used, firstly, before concrete is poured, the sensor component 1 and the calibration component 2 are embedded into a designated position of a point to be measured, and the hydraulic driving component 3 is left outside the pouring range of the concrete 6; after pouring or in the service process, when the vibrating wire strain sensor body 12 needs to be calibrated, the hydraulic driving assembly 3 can drive the piston 22 of the calibration assembly 2 to move, and then drive the anchoring sliding block 14 of the sensor assembly 1 to move, so that the steel wire 121 in the vibrating wire strain sensor body 12 is deformed, and the vibrating wire strain sensor body 12 is calibrated by utilizing a relation curve between the deformation amount of the steel wire 121 and the movement amount of the piston 22. The embedded concrete self-calibration strain sensor can calibrate after being embedded into concrete 6, improves accuracy and reliability, can be used for a long time, can calibrate at any time, and is not interfered by natural factors or vibration factors such as wind, snow, rain and the like.
In some embodiments, as shown in fig. 2, hydraulic chamber 21 further includes: a second anchor flange 214. The second anchor flange 214 is provided on the outer circumferential surface of the cylinder 211.
In some examples, as shown in fig. 2, the second anchor flange 214 is an integrally formed structure with the barrel 211. This arrangement facilitates increasing the structural strength of second anchor flange 214.
In some examples, as shown in fig. 2, a second anchor flange 214 is located on an end of the barrel 211, with an end face of the second anchor flange 214 being flush with an end face of the barrel 211. By this arrangement, the width of the end face of the hydraulic chamber 21 can be increased, so that the connection between the sliding sleeve 11 and the hydraulic chamber 21 is facilitated.
In this embodiment, the second anchoring flange 214 is provided on the outer peripheral surface of the cylinder 211, so that the hydraulic cavity 21 can be firmly anchored in the concrete 6, which is beneficial to the fixation of the end of the vibrating wire strain sensor body 12.
In some embodiments, as shown in fig. 2, hydraulic chamber 21 further includes: securing sleeve 215. The fixed sleeve 215 is disposed at an end of the cylinder 211 remote from the end cap. The sliding sleeve 11 is connected to the fixed sleeve 215. The anchor slide 14 is located in the fixing sleeve 215.
In some examples, as shown in fig. 2, the inner diameter of the stationary sleeve 215 is larger Yu Zhenxian than the outer diameter of the strain sensor body 12. So arranged, space can be provided for the anchor slide 14 to install and slide.
In some examples, as shown in fig. 2, the sliding sleeve 11 is stepped, including a large diameter section and a small diameter section. The vibrating wire strain sensor body 12 is located in a small-diameter section, and a large-diameter section is sleeved on the periphery of the fixed sleeve 215 and fixedly connected with the fixed sleeve 215. So set up, under the prerequisite of guaranteeing fixed sleeve 215 and slip cap 11 effective connection, advantageously reduce occupation space, can not cause a large amount of cavitys when burying in concrete 6, can be fit for the monitoring of many complicated positions.
In this embodiment, the fixed sleeve 215 is disposed at one end of the cylinder 211 far away from the end cover 212, so that the sliding sleeve 11 is sleeved on the fixed sleeve 215, and connection between the sensor assembly 1 and the calibration assembly 2 is realized, so that the installation and the use are convenient.
In some embodiments, as shown in fig. 1 and 3, the hydraulic drive assembly 3 includes: an electronic micropump 31 and a delivery pipe 32. The electronic micro pump 31 includes hydraulic oil 7 therein. The electronic micro pump 31 is communicated with the hydraulic cavity 21 through an oil delivery pipe 32.
In some examples, referring to fig. 3, the accuracy of the electronic micro pump 31 is Yu Zhenxian greater than the accuracy of the strain sensor body 12. The arrangement is beneficial to improving the accuracy of the calibration result.
In some examples, referring to fig. 3, the electronic micro pump 31 ranges from 10ml, 20ml, 30ml, 50ml, etc. Specifically, the vibration wire strain sensor body 12 can be set according to the measuring range, and the embodiment does not limit the measurement.
In some examples, referring to FIG. 3, the infusion rate of the electronic micro pump 31 is 0.01-0.1 ml/hr. The specific infusion rate may be set depending on the accuracy of the vibrating wire strain sensor body 12, which is not overly limited by the present embodiment.
In some examples, as shown in fig. 1, oil delivery tube 32 is connected to end cap 212 of hydraulic chamber 21. This arrangement allows hydraulic oil 7 to be fed into the sealed space between the piston 22 and the end cap 212, thereby driving the piston 22 to move.
The present embodiment employs an electronic micro pump 31 to drive the hydraulic oil 7 into the hydraulic chamber 21, thereby pushing the piston 22 to move. The electronic micro pump 31 has good precision and reliability, which is beneficial to improving the accuracy and sensitivity of calibration.
In some embodiments, as shown in FIG. 1, the oil delivery pipe 32 includes: a first valve 33 and a second valve 34. The first valve 33 is adjacent to the electronic micropump 31. The second valve 34 is adjacent to the hydraulic chamber 21.
The first valve 33 and the second valve 34 are provided on the oil delivery pipe 32 in this embodiment. The first valve 33 is close to the electronic micro pump 31, and when the first valve 33 is not calibrated, the hydraulic oil 7 in the electronic micro pump 31 can be prevented from flowing out by closing. The second valve 34 is close to the hydraulic cavity 21, when the second valve 34 is not calibrated, the hydraulic oil 7 in the hydraulic cavity 21 is prevented from flowing into the oil delivery pipe 32, the piston 22 is kept static, and the measurement accuracy of the mixed vibration wire strain sensor body 12 is ensured.
In some embodiments, as shown in fig. 1, the pre-buried concrete self-calibration strain sensor further comprises: a display device 4. The display device 4 is used for displaying the movement amount of the piston.
In some examples, as shown in fig. 1, the display device 4 includes a display screen connected to the electronic micro pump 31.
The present embodiment can intuitively display the movement data of the piston 22 by providing the display device 4, so as to facilitate the comparison with the strain data of the vibrating wire strain sensor body 12.
In some embodiments, as shown in fig. 2, the pre-buried concrete self-calibration strain sensor further comprises: and a junction box 5. The pod 5 is adapted to receive the hydraulic drive assembly 3.
In some examples, as shown in fig. 1, the pod 5 is embedded on the surface of a concrete structure. One end of the oil delivery pipe 32 is connected to the hydraulic cavity 21 pre-buried in the concrete 6, and the other end extends out of the concrete structure through the side wall of the junction box 5 and is connected to the electronic micro pump 31.
By arranging the adapter box 5, the hydraulic drive assembly 3 is provided with an accommodating space. When the calibration is not required, the hydraulic drive assembly 3 is accommodated in the adapter box 5, and the hydraulic drive assembly 3 can be protected. When the calibration is needed, the hydraulic drive assembly 3 is taken out of the adapter box 5, and the use is convenient.
In some embodiments, referring to fig. 1 and 2, the resistance spring 24 has a stiffness k 1 The stiffness of the steel wire 121 in the vibrating wire strain sensor body 12 is k 2 ，k 1 ≥10*k 2 。
In this embodiment, the stiffness of the resistance spring 24 is greater than 10 times that of the steel wire 121 inside the vibrating wire strain sensor body 12, and when the stiffness is not calibrated, the anchoring slider 14 of the vibrating wire strain sensor body 12 is relatively fixed under the supporting action of the resistance spring 24, so that the measuring precision of the vibrating wire strain sensor body 12 is not affected.
In the above embodiment, the structure of the self-calibration strain sensor of the embedded concrete is described. The embedded concrete self-calibration strain sensor in the embodiment can calibrate the vibrating wire strain sensor body in embedded concrete by comparing the calibration data of the calibration assembly 2 with the strain data of the vibrating wire strain sensor body 12 by utilizing a hydraulic technology, and meanwhile, the tracing of the strain data value of the concrete is ensured. The embedded concrete strain sensor is high in structural integration degree and automation degree, and can solve the problems of different measuring ranges, long-period use and embedded concrete strain calibration, thereby improving the accuracy and reliability of the embedded concrete strain sensor. In addition, the self-calibration strain sensor for the embedded concrete in the embodiment has the advantages of smaller size, light weight, smaller occupied space, no large number of cavities and suitability for monitoring more complex positions. The measuring and reading precision is higher, the measuring range is large, the automation degree is high, the calibration can be carried out at any time, and the measuring and reading device is not interfered by natural factors such as wind, snow, rain and the like or vibration factors.
In a second aspect, the present embodiment further provides a calibration method for the self-calibration strain sensor of the pre-buried concrete in the above embodiment. Fig. 5 is a flowchart of a calibration method provided in this embodiment.
As shown in fig. 5, the calibration method of the present embodiment includes the following steps:
s1, a hydraulic driving assembly 3 is used for driving a piston 22 to move, so that an anchoring sliding block 14 is driven to move, and a steel string 121 in a vibrating string strain sensor body 12 is deformed.
Specifically, as shown in fig. 1 to 4, an electronic micro pump 31 is used to inject hydraulic oil 7 into a hydraulic cavity 21 through an oil delivery pipe 32 to drive a piston 22 to move; the movement of the piston 22 drives the anchor slide 14 to move, thereby causing the vibrating wire strain sensor body 12 to strain.
S2, acquiring the relation between the deformation of the steel string 212 and the movement of the piston 22, and calibrating.
Specifically, the calculation formula of the movement amount of the piston 22 is:
（1）
wherein,the displacement of the piston 22, V, is the volume of the hydraulic oil 7 injected, and r is the radius of the hydraulic chamber 21.
The calculation formula of the volume of the injected hydraulic oil 7 is:
V=υ×t（2）
where V is the volume of the injected hydraulic oil 7, V is the infusion rate of the electronic micropump 31, and t is the infusion time.
The strain calculation formula of the chord strain sensor body 12 is:
（3）
wherein epsilon is the strain,the deformation of the steel string 121 is represented by L, which is the original dimension of the steel string 121 before being stressed.
Establishing inputs according to formulas (1), (2), (3)And output->The relationship between them is calibrated accordingly.
The calibration method provided by the embodiment can calibrate the vibrating wire strain sensor embedded in the concrete at any time, thereby ensuring the accuracy of the vibrating wire strain sensor and prolonging the service life of the vibrating wire strain sensor.
In some embodiments, referring to FIG. 5, calibration grading is performed.
In some examples, the calibration is carried out in a grading manner, at least 5-10 gradients are divided in the whole range, the process and return calibration is realized through pressurization and extraction of the electronic micro pump 31, and the calibration result can accurately reflect the relation curve between the input and the output of the embedded concrete self-calibration strain sensor.
According to the embodiment, the accuracy can be improved through grading calibration.
The above embodiments describe the calibration method. The calibration method of the embodiment realizes the graded calibration of the strain sensor of the embedded concrete by comparing the calibration data with the strain data by utilizing a hydraulic technology, ensures the tracing of the strain data value of the concrete, has high degree of automation, solves the problems of different measuring ranges, long-period use and strain calibration of the strain sensor of the embedded concrete, and improves the accuracy and the reliability of the strain sensor of the embedded concrete.
It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.
The foregoing description of the preferred embodiment of the present invention is not intended to limit the invention to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. The foregoing is merely a preferred embodiment of the present application and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principles of the present application, and these modifications and variations should also be regarded as the scope of the present application.
Claims (10)
1. The utility model provides a pre-buried concrete self calibration strain sensor which characterized in that includes:
the sensor assembly comprises a sliding sleeve, a vibrating wire strain sensor body, a first anchoring flange and an anchoring sliding block; the vibrating wire strain sensor body is movably arranged in the sliding sleeve; one end of the vibrating wire strain sensor body extends out of the sliding sleeve and is connected to the first anchoring flange; the anchoring sliding block is connected to one end, far away from the first anchoring flange, of the vibrating wire strain sensor body;
the calibration assembly comprises a hydraulic cavity, a connecting rod and a resistance spring; the hydraulic cavity comprises a cylinder body, an end cover and a blocking edge; the end cover is arranged at one end of the cylinder body; the blocking edge is positioned on the inner wall of the cylinder body and is close to one end of the cylinder body far away from the end cover; a piston is arranged in the hydraulic cavity; the connecting rod is connected between the anchoring sliding block and the end face of the piston, which faces the blocking edge; the resistance spring is arranged on the connecting rod and connected between the piston and the blocking edge;
the hydraulic driving assembly is communicated with the hydraulic cavity; the hydraulic drive assembly is used for driving the piston to move in the hydraulic cavity, and then drives the anchor slide block to move, and the hydraulic drive assembly comprises: the electronic micro pump and the oil delivery pipe are connected to the end cover;
the stiffness of the resistance spring is larger than that of the steel wire inside the vibrating wire strain sensor body, and the maximum pressure exerted on the piston by the resistance spring is smaller than the driving force of the hydraulic driving assembly.
2. The embedded concrete self-calibrating strain sensor of claim 1, wherein the hydraulic chamber further comprises:
and the second anchoring flange is arranged on the outer circumferential surface of the cylinder body.
3. The pre-buried concrete self-calibrating strain sensor of claim 1 or 2, wherein the hydraulic chamber further comprises:
the fixed sleeve is arranged at one end of the cylinder body far away from the end cover; the sliding sleeve is connected to the fixed sleeve; the anchoring slider is located in the fixed sleeve.
4. The embedded concrete self-calibration strain sensor of claim 1 wherein the electronic micro pump comprises hydraulic oil;
the electronic micro pump is communicated with the hydraulic cavity through the oil delivery pipe.
5. The self-calibrating strain sensor of claim 4, wherein the oil delivery pipe comprises: a first valve and a second valve;
the first valve is close to the electronic micro pump;
the second valve is adjacent to the hydraulic cavity.
6. The embedded concrete self-calibrating strain sensor of claim 1, further comprising:
and the display device is used for displaying the moving amount of the piston.
7. The embedded concrete self-calibrating strain sensor of claim 1, further comprising:
and the adapter box is used for accommodating the hydraulic driving assembly.
8. The embedded concrete self-calibrating strain sensor of claim 1 wherein the stiffness of the resistance spring is k1; the rigidity of the steel wire in the vibrating wire strain sensor body is k2;
k1≥10*k2。
9. a calibration method for a self-calibrating strain sensor of pre-embedded concrete according to any one of claims 1 to 8, characterized in that the method comprises the following steps:
the hydraulic driving assembly is used for driving the piston to move, so that the anchoring sliding block is driven to move, and the steel wire in the vibrating wire strain sensor body is deformed;
and obtaining the relation between the deformation of the steel string and the movement of the piston, thereby calibrating.
10. The calibration method according to claim 9, characterized in that the calibration is performed in stages.
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| CN101738157A (en) * | 2009-12-18 | 2010-06-16 | 华南理工大学 | Calibrating device for vibrating string type strain transducer |
| CN102608296A (en) * | 2012-02-17 | 2012-07-25 | 浙江大学 | Device and method for simulating and monitoring expanding and cracking of concrete |
| CN105221172A (en) * | 2015-09-21 | 2016-01-06 | 中国矿业大学 | A kind of end-fixed bolter free segment real-time axle power nondestructive testing calibration system and method |
| WO2018072096A1 (en) * | 2016-10-18 | 2018-04-26 | 金宙科技有限公司 | Measurement system for calibrating automobile spring parameter |
| CN108253923A (en) * | 2017-12-25 | 2018-07-06 | 中冶建筑研究总院有限公司 | A kind of prepackage caliberating device |
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