CN113008976A - Steel bar corrosion device suitable for three magnetic sensors and calibration method - Google Patents
Steel bar corrosion device suitable for three magnetic sensors and calibration method Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 145
- 239000010959 steel Substances 0.000 title claims abstract description 145
- 230000007797 corrosion Effects 0.000 title claims abstract description 59
- 238000005260 corrosion Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 16
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 15
- 230000006698 induction Effects 0.000 claims description 23
- 230000008859 change Effects 0.000 claims description 22
- 238000005303 weighing Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 16
- 239000011150 reinforced concrete Substances 0.000 description 15
- 238000004364 calculation method Methods 0.000 description 9
- 238000012544 monitoring process Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 5
- 239000004567 concrete Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000005672 electromagnetic field Effects 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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Abstract
A steel bar corrosion device suitable for three magnetic sensors comprises a main body unit, a first threaded hole unit, a second threaded hole unit, a third threaded hole unit, a fourth threaded hole unit, a fifth threaded hole unit, a sixth threaded hole unit, a seventh threaded hole unit, an eighth threaded hole unit, a ninth threaded hole unit, a tenth threaded hole unit, a first bolt unit, a second bolt unit, a third bolt unit, a fourth bolt unit, a fifth bolt unit, a first scale mark, a second scale mark, a third scale mark, a fourth scale mark, a fifth scale mark and a sixth scale mark; the five cushion block units are used for placing the external parts of the first, third, fourth, fifth and sixth calibration holes, namely the external and separated sensors. And provides a steel bar corrosion calibration method suitable for three magnetic sensors. The invention has simple operation, high accuracy, low cost and strong laboratory applicability, and is suitable for reinforcing steel bars of various sizes.
Description
Technical Field
The invention relates to a steel bar calibration device and a steel bar calibration method in a reinforced concrete test, in particular to a steel bar corrosion device and a steel bar corrosion calibration method suitable for three magnetic sensors.
Background
Concrete materials are widely used in the field of civil engineering as the most widely used building materials today. The corrosion of steel bars is the main cause of the rust cracking failure of the concrete structure, and the rust expansion cracking of the reinforced concrete structure caused by the corrosion of the steel bars is the important cause of the reduction of the bearing capacity and the service performance of the structure. According to data published by the Chinese academy of sciences oceans: the corrosion loss of China is up to 1.6 trillion yuan each year, wherein the corrosion loss of infrastructure and buildings is up to 5000 trillion yuan.
Therefore, the long-term monitoring of the steel bars after the service of the reinforced concrete structure is very important, and if the steel bars are monitored and found in the early stage of structure cracking caused by rusting, the steel bars can be maintained in time, so that the service life of the structure can be greatly prolonged.
Based on the above background, the chinese patent grant publication No. CN109374726A, the grant publication date is 22/2/2019, the name is "a sensor and a system for monitoring nondestructive corrosion of steel bar in concrete based on magnetic field", the chinese patent grant publication No. CN208420791U, the grant publication date is 22/1/2019, the name is "a device for changing response of steel bar corrosion electromagnetic field", the chinese patent grant publication No. CN110646505A, the grant publication date is 1/3/2020, the name is "an external sensor and a test method for monitoring nondestructive corrosion of steel bar based on electromagnetic field principle", the name is "a chinese patent grant publication No. CN112034033A, the grant publication date is 12/4/2020, the name is" a separate sensor and a test method for monitoring non-uniform corrosion of steel bar based on magnetic field principle ", the patent provides a plurality of steel bar corrosion monitoring sensors based on the magnetic field principle and monitoring methods thereof, which are used for monitoring the steel bar corrosion condition in a reinforced concrete structure.
The corrosion monitoring sensor is generally used for in-situ monitoring of the steel bars. In the laboratory verification stage of the sensor, the corrosion steel bars need to be calibrated to determine the corrosion degree. The calibration process is as follows: after the sensor is used for reading the magnetic induction intensity of the steel bar to be measured, the steel bar is shifted and weighed, then the steel bar is manually electrified and corroded, after the manual corrosion is finished, the steel bar is weighed again, the sensor is used for measuring the magnetic induction intensity of the same position, and the steel bar corrosion degree is determined according to a formula after the weight and the magnetic induction intensity data before and after the steel bar corrosion are obtained. Therefore, the accuracy of the magnetic induction intensity greatly affects the calibration precision.
The following problems are encountered during steel bar calibration: firstly, the steel bar calibration needs higher precision, after the steel bar is shifted and weighed and corroded manually, the relative position of the steel bar and a sensor measuring head needs to be adjusted, so that the relative position of a steel bar measuring point and the measuring head is completely consistent with that before the steel bar measuring point and the measuring head are shifted, and magnetic induction reading can be carried out. The calibration is carried out by means of auxiliary tools such as a clamp, a graduated scale and the like, the operation difficulty is high, and the test precision is difficult to ensure; secondly, the sensors for calibration verification mainly have three types, namely an internal type, a separated type and an external type, and a single clamp cannot meet the calibration requirements of various types of sensors at the same time. Considering that the components of the separated and built-in sensors need to be embedded in concrete in the practical application process of the sensors, how to fix the embedded parts of the sensors in the laboratory stage needs to be considered to ensure that the embedded parts of the sensors are fixed; and thirdly, the laboratory comprises an engineering application stage, the diameters of the steel bars are different from 14mm to 20mm, and the calibration precision of the steel bars with different sizes cannot be guaranteed through manual correction.
A possible alternative is to use a steel bar clamp that can be weighed, the clamping device being able to perform both the functions of fixing and weighing the steel bar. Based on the theory, the Chinese patent application publication No. CN111392574A, with the application publication date of 2020, 7 and 10, is named as a steel bar clamp capable of weighing, mainly relates to material transfer and transportation, and can realize automatic clamping and weighing of steel bars. However, the patent is mainly used for transporting the steel bars in the construction stage of the building, and only reference is made for calibrating the steel bars in a laboratory.
Further, considering that the research on the durability of reinforced concrete is a popular field in recent years, many laboratories in China are conducting the research on corrosion of reinforced concrete. A calibration device suitable for all sizes of reinforcing steel bars provides a great deal of convenience for the test.
The above problems are urgently needed to be solved. Therefore, a steel bar calibration device suitable for steel bars of various sizes and sensors of various types is specially developed, the steel bar calibration device has very important engineering value, the efficiency of a steel bar corrosion test in a laboratory can be greatly improved, and the smooth research is helped.
Disclosure of Invention
In order to solve the problems that no special steel bar corrosion calibration device exists at present, the invention provides the corrosion steel bar calibration device and the calibration method thereof, which are simple and convenient to operate, suitable for steel bars of various sizes, high in accuracy, low in cost and strong in laboratory applicability.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a steel bar corrosion device suitable for three magnetic sensors comprises a main body unit, a first calibration hole unit, a second calibration hole unit, a third calibration hole unit, a fourth calibration hole unit, a fifth calibration hole unit, a sixth calibration hole unit, a first built-in embedding unit, a first separated embedding unit, a first cushion block unit, a second cushion block unit, a third cushion block unit, a fourth cushion block unit, a fifth cushion block unit, a first threaded hole unit, a second threaded hole unit, a third threaded hole unit, a fourth threaded hole unit, a fifth threaded hole unit, a sixth threaded hole unit, a seventh threaded hole unit, an eighth threaded hole unit, a ninth threaded hole unit, a tenth threaded hole unit, a first bolt unit, a second bolt unit, a third bolt unit, a fourth bolt unit, a fifth bolt unit, a first scale mark, a second scale mark, a third scale mark line, The fourth scale mark, the fifth scale mark and the sixth scale mark.
The main body unit is provided with threaded holes according to the mounting positions of the first cushion block unit, the second cushion block unit and the fifth cushion block unit, the threaded holes correspond to the threaded holes in the cushion block units one by one and are used for mounting and fixing the cushion block units; the first to sixth calibration hole units are holes formed in the main body unit; the first built-in embedding unit is a main body unit with a groove; the circle center of the opening of the first built-in embedded unit slotting is superposed with the circle center of the second calibration hole unit; the first separated embedded unit is a main body unit with a groove; the short edge of the first separated embedded unit slot is tangent to the center of the fifth calibration hole unit; the first cushion block unit, the second cushion block unit, the third cushion block unit, the fourth cushion block unit and the fifth cushion block unit are detachable.
Furthermore, the main body unit is made of transparent acrylic materials. The main part unit includes that the cushion unit is made by transparent ya keli material, and permeable device direct observation reinforcing bar of demarcation stage is convenient for experimental analysis. In order to improve the cost performance of the device, other transparent environment-friendly light materials can be adopted.
Preferably, the main body unit can also be made of other transparent environment-friendly light materials so as to meet the cost performance requirement of the calibration device.
And the first cushion block unit, the second cushion block unit, the third cushion block unit, the fourth cushion block unit and the fifth cushion block unit are used for placing the external parts of the first, third, fourth, fifth and sixth calibration holes, namely the external and separate sensors.
The foot part of the main body unit is provided with five threaded holes for installing a first cushion block unit, a second cushion block unit, a third cushion block unit, a fourth cushion block unit and a fifth cushion block unit which are taken as disassembly pieces.
The first cushion block unit, the second cushion block unit, the third cushion block unit, the fourth cushion block unit and the fifth cushion block unit are dismounting pieces, are provided with threaded holes, are installed on the main body unit through bolts, and are installed partially according to the calibration requirements.
The first calibration hole unit, the second calibration hole unit, the third calibration hole unit, the fourth calibration hole unit, the fifth calibration hole unit and the sixth calibration hole unit are cylindrical openings in the main body unit. The calibration of the common steel bar with the diameter of 14-20 mm in the field of buildings can be realized.
And the edge of each calibration hole unit hole is provided with a scale mark for calibrating the reinforcing steel bar and ensuring the calibration precision.
The second calibration hole unit is used for calibrating the built-in sensor steel bars; the first built-in embedding unit is a slot on the main body unit and is used for installing a built-in sensor, and the built-in sensor is a complete sensor structure and participates in steel bar calibration;
the fifth calibration hole unit is used for calibrating the separated sensor steel bars; the first separated embedded unit is a main body unit provided with a groove and used for installing a separated sensor embedded part, and the external part is arranged on the cushion block unit to assemble a complete separated sensor to participate in steel bar calibration;
the first calibration hole unit, the third calibration hole unit, the fourth calibration hole unit and the sixth calibration hole unit can be used for external sensor steel bar calibration; the first cushion block unit, the third cushion block unit, the fourth cushion block unit and the sixth cushion block unit are respectively matched with the first calibration hole unit, the third calibration hole unit, the fourth calibration hole unit and the sixth calibration hole unit to be used for installing an external sensor, and the external sensor is a complete sensor structure and participates in steel bar calibration.
A steel bar corrosion calibration method suitable for three magnetic sensors comprises the following steps:
firstly, selecting a calibration hole according to a sensor participating in calibration; placing the device on a plane, installing the cushion block unit on the main body unit, and fixing the cushion block unit by using bolts; weighing the steel bar to be measured and then inserting the steel bar to be measured into the selected calibration hole; installing a sensor accessory: the separated and built-in sensors can directly install the built-in components into sensor grooves arranged in the device, and the external parts of the separated and built-out sensors are arranged on sensor cushion layers;
then, marking on the steel bar according to the position indicated by the calibration line of the edge of the calibration hole; using the sensor readings; taking out the steel bars and carrying out electrification corrosion; weighing after the corrosion is finished; reinserting the reinforcing steel bars into the calibration holes; correcting the position of the steel bar according to the scale marks and the marks on the steel bar to ensure that the position of the steel bar is consistent with that before the steel bar is taken out; reading again by using the sensor;
and finally, calibrating the steel bar corrosion condition according to the measured mass change and the magnetic induction intensity change.
The invention has the following beneficial effects: the invention can overcome the defects of difficult operation and low precision in the calibration process under the laboratory environment, and realizes the calibration process of the corrosion reinforcing steel bars in various sizes; the calibration hole can be adjusted according to the type of the sensor, the calibration of each steel bar corrosion sensor can be realized, the method has the advantages of clear principle, simplicity and convenience, accurate positioning, repeated use, good stability and the like, and the vacancy of the conventional calibration device can be made up.
Drawings
Fig. 1 is a schematic view of the overall structure of a steel bar rusting device suitable for three magnetic sensors.
Fig. 2 is three views of a steel bar rusting apparatus suitable for three kinds of magnetic sensors, in which (a) is a front view, (b) is a right view, and (c) is a front view.
Fig. 3 is three views of a steel bar rusting device without a cushion layer suitable for three magnetic sensors, wherein (a) is a front view, (b) is a right view, and (c) is a front view.
Fig. 4 is a schematic view of the slot of the embedded unit.
Fig. 5 is a schematic view of the split type embedded unit slotting.
Fig. 6 is a three-dimensional perspective view of a steel bar rusting device suitable for three magnetic sensors.
Fig. 7 is three views of the external sensor, in which (a) is a front view, (b) is a right side view, and (c) is a front view.
Fig. 8 is a three-dimensional view of the separated sensor, in which (a) is a front view, (b) is a right side view, and (c) is a front view.
Fig. 9 is a three-dimensional view of the built-in sensor, in which (a) is a front view, (b) is a right side view, and (c) is a front view.
Fig. 10 is three views of the device, wherein (a) is a front view, (b) is a right side view, and (c) is a front view.
Reference numerals: 1. a main body unit; 21. a first calibration hole; 22. a second calibration hole; 23. a third calibration hole; 24. a fourth calibration hole; 25. a fifth calibration hole; 26. a sixth calibration hole; 31. a first built-in embedded unit; 32. a second split type embedding unit; 41. a first pad unit; 42. a second pad unit; 43. a third pad unit; 44. a fourth pad unit; 45. a fifth pad unit; 51. a first screw hole unit; 52. a second screw hole unit; 53. a third screw hole unit; 54. a fourth screw hole unit; 55. a fifth screw hole unit; 61. a sixth screw hole unit; 62. a seventh screw hole unit; 63. an eighth threaded hole unit; 64. a ninth screw hole unit; 65. a tenth screw hole unit; 71. a first bolt unit; 72. a second bolt unit; 73. a third bolt unit; 74. a fourth bolt unit; 75. a fifth bolt unit, 81, a first scale mark; 82. a second scale mark; 83. a third scale line; 84. a fourth tick mark; 85. a fifth scale mark; 86. sixth tick mark.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, wherein the terms "upper", "lower", "front", "rear", "left", "right", "bottom", and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings, which is for convenience of description only and does not require that the invention be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.
Referring to fig. 1 to 9, a calibration apparatus for a rusted steel bar includes a main body unit 1, a first calibration hole unit 21, a second calibration hole unit 22, a third calibration hole unit 23, a fourth calibration hole unit 24, a fifth calibration hole unit 25, a sixth calibration hole unit 26, a first built-in embedding unit 31, a first separated embedding unit 32, a first pad block unit 41, a second pad block unit 42, a third pad block unit 43, a fourth pad block unit 44, a fifth pad block unit 45, a first threaded hole unit 51, a second threaded hole unit 52, a third threaded hole unit 53, a fourth threaded hole unit 54, a fifth threaded hole unit 55, a sixth threaded hole unit 61, a seventh threaded hole unit 62, an eighth threaded hole unit 63, a ninth threaded hole unit 64, a tenth threaded hole unit 65, a first bolt unit 71, a second bolt unit 72, a third bolt unit 73, a third threaded hole unit 41, a fourth threaded hole unit 41, a third pad unit 42, a fourth pad unit, A fourth bolt unit 74, a fifth bolt unit 75, a first tick mark 81, a second tick mark 82, a third tick mark 83, a fourth tick mark 84, a fifth tick mark 85, a sixth tick mark 86.
The main body unit 1 is made of acrylic materials, and holes and grooves are formed in the main body unit according to calibration requirements; the first calibration hole unit 21, the second calibration hole unit 22, the third calibration hole unit 23, the fourth calibration hole unit 24, the fifth calibration hole unit 25 and the sixth calibration hole unit 26 are holes formed in the main body unit 1, and the depth of the holes does not penetrate through the main body unit; scale marks are arranged beside each calibration hole unit and used for realizing steel bar calibration; the first built-in embedding unit 31 and the first separated embedding unit 32 are slots on the main body unit 1, and the relative positions of the slots and the calibration hole unit have certain requirements; the body unit leg is provided with a first screw hole unit 51, a second screw hole unit 52, a third screw hole unit 53, a fourth screw hole unit 54, and a fifth screw hole unit 55, respectively.
The first, second, third, fourth and fifth pad block units 41, 42, 43, 44 and 45 are respectively provided with a sixth, seventh, eighth, ninth and tenth threaded hole units 61, 62, 63, 64 and 65, and each pad block unit is mounted at a corresponding position of the main body unit by bolts.
Further, the first to fifth mat units can be selectively installed according to the types of sensors participating in calibration, and need not be installed on the apparatus all at once.
A steel bar corrosion calibration method suitable for three magnetic sensors comprises the following steps:
1) steel bar calibration by using external sensor
The first, third, fourth and sixth calibration holes can be used for external sensor steel bar calibration, taking the first calibration hole calibration as an example.
Firstly, the main body unit 1 is placed on a non-inclined plane, the sixth threaded hole unit 61 on the first cushion block unit 41 is aligned with the first threaded hole unit 51 of the main body unit 1 and is fixed by the first bolt unit 71, and the calibration device is installed.
Mounting an external sensor on the first cushion block unit; then, the measured steel bar is weighed and inserted into the first calibration hole unit 21, and the steel bar is marked according to the position indicated by the first scale mark 81; taking readings using a separate sensor; taking out the steel bars and carrying out electrification corrosion; weighing the steel bars again after the corrosion is finished; reinserting the reinforcing bars into the first calibrated hole unit 21; correcting the position of the steel bar according to the first scale marks 81 and the marks on the steel bar to ensure that the position of the steel bar is consistent with that before the steel bar is taken out; reading again using the separate sensor; and calibrating the steel bar corrosion condition according to the measured mass change and the magnetic induction intensity change.
The specific calibration calculation formula is as follows:
1. record the mass of the test piece as miICorresponding magnetic induction intensity data B of calibration reinforcing steel bar before corrosion of reinforced concrete test pieceiII is the electrifying time, I is the mark before electrifying, and II is the mark after electrifying;
2. the simulation experiment of the steel bar corrosion is realized in a mode of accelerating the corrosion by current, the current density is controlled to be the same as the electrifying time, and the mass is miIElectrifying the corresponding reinforced concrete test pieces for i days respectively;
3. recording the magnetic induction intensity data B of the calibration steel bars after each group of reinforced concrete test pieces are corrodediIIAnd steel bar quality data miII；
Respectively calculating and calibrating the mass change rate delta m of the reinforcing steel bariThe calculation formula is formula (1);
respectively calculating and calibrating the magnetic induction intensity change rate delta B of the reinforcing steel barsiThe calculation formula is formula (2)
And performing linear fitting on the relationship between the steel bar mass change rate and the Hall sensor magnetic induction intensity change rate to obtain a linear relationship coefficient alpha, and completing calibration.
2) Using a built-in sensor to calibrate the steel bars:
the second calibration hole can be used for built-in sensor steel bar calibration.
The main unit 1 is first placed on a non-inclined plane and the calibration device is ready for completion.
Firstly, the built-in sensor is arranged on a slot on the main body unit 1 where the first built-in embedding unit 31 is arranged; then the measured steel bar is weighed and inserted into the second calibration hole unit 22, and the steel bar is marked according to the position indicated by the second scale mark 82; taking readings using a separate sensor; taking out the steel bars and carrying out electrification corrosion; weighing the steel bars again after the corrosion is finished; reinserting the rebar into the second calibrated hole unit 22; correcting the position of the steel bar according to the second scale marks 82 and the marks on the steel bar to ensure that the position of the steel bar is consistent with that before the steel bar is taken out; reading again using the separate sensor; and calibrating the steel bar corrosion condition according to the measured mass change and the magnetic induction intensity change.
The specific calibration calculation formula is as follows:
1. record the mass of the test piece as miICorresponding magnetic induction intensity data B of calibration reinforcing steel bar before corrosion of reinforced concrete test pieceiII is the electrifying time, I is the mark before electrifying, and II is the mark after electrifying;
2. the simulation experiment of the steel bar corrosion is realized in a mode of accelerating the corrosion by current, the current density is controlled to be the same as the electrifying time, and the mass is miIElectrifying the corresponding reinforced concrete test pieces for i days respectively;
3. recording magnetic induction intensity data B of calibration steel bars after corrosion of reinforced concrete test pieceiIIAnd steel bar quality data miII；
Respectively calculating and calibrating the mass change rate delta m of the reinforcing steel bariThe calculation formula is formula (1);
respectively calculating and calibrating the magnetic induction intensity change rate delta B of the reinforcing steel barsiThe calculation formula is formula (2)
And performing linear fitting on the relationship between the steel bar mass change rate and the Hall sensor magnetic induction intensity change rate to obtain a linear relationship coefficient alpha, and completing calibration.
3) And (3) using a separate sensor to calibrate the steel bars:
the fifth calibration hole can be used for calibration of the separated sensor steel bar.
Firstly, the main body unit 1 is placed on a non-inclined plane, the ninth threaded hole unit 64 on the fourth pad block unit 45 is aligned with the fourth threaded hole unit 54 on the main body unit 1, the fourth pad block unit 44 is installed at the position of the fifth calibration hole 25 and is fixed by the fourth bolt unit 74, and the calibration device is installed.
Mounting the separate sensor built-in portion on the main body unit 1 on the groove where the first separate embedding unit 32 is located; mounting the external part of the separated sensor at a specified position on a sensor cushion layer; then, the measured steel bar is weighed and inserted into the fifth calibration hole unit 25, and the steel bar is marked according to the position indicated by the fifth scale mark 85; taking readings using a separate sensor; taking out the steel bars and carrying out electrification corrosion; weighing the steel bars again after the corrosion is finished; reinserting the steel bars into the fifth calibrated hole unit 25; correcting the position of the steel bar according to the fifth scale mark 85 and the mark on the steel bar to ensure that the position of the steel bar is consistent with that before the steel bar is taken out; reading again using the separate sensor; and calibrating the steel bar corrosion condition according to the measured mass change and the magnetic induction intensity change.
The specific calibration calculation formula is as follows:
1. record the mass of the test piece as miICorresponding magnetic induction intensity data B of calibration reinforcing steel bar before corrosion of reinforced concrete test pieceiII is the electrifying time, I is the mark before electrifying, and II is the mark after electrifying;
2. the simulation experiment of the steel bar corrosion is realized in a mode of accelerating the corrosion by current, the current density is controlled to be the same as the electrifying time, and the mass is miIElectrifying the corresponding reinforced concrete test pieces for i days respectively;
3. recording magnetic induction intensity data B of calibration steel bars after corrosion of reinforced concrete test pieceiIIAnd steel bar quality data miIIThe magnetic induction measurement process is shown in fig. 10;
respectively calculating and calibrating the mass change rate delta m of the reinforcing steel bariThe calculation formula is formula (1);
respectively calculating and calibrating the magnetic induction intensity change rate delta B of the reinforcing steel barsiThe calculation formula is formula (2)
And performing linear fitting on the relationship between the steel bar mass change rate and the Hall sensor magnetic induction intensity change rate to obtain a linear relationship coefficient alpha, and completing calibration.
To sum up, under the condition that the external sensor and the built-in sensor participate in calibration, the external sensor can be calibrated by the first calibration hole unit 21, the third calibration hole unit 23, the fourth calibration hole unit 24 and the sixth calibration hole unit 26, and compared with the separated sensor, the operation steps need to install the external sensor on the corresponding cushion block unit without installing a built-in part; the built-in sensor can be calibrated by the second calibration hole unit 22, and compared with the separated sensor, the operation steps need to install the built-in sensor on the slot of the first built-in embedding unit 31 without installing a cushion block unit and an external part of the sensor.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, which are intended for purposes of illustration only. The scope of the present invention should not be construed as being limited to the particular forms set forth in the examples, but rather as being defined by the claims and the equivalents thereof which can occur to those skilled in the art upon consideration of the present inventive concept.
Claims (9)
1. The device is characterized by comprising a main body unit, a first calibration hole unit, a second calibration hole unit, a third calibration hole unit, a fourth calibration hole unit, a fifth calibration hole unit, a sixth calibration hole unit, a first built-in embedded unit, a first separated embedded unit, a first cushion block unit, a second cushion block unit, a third cushion block unit, a fourth cushion block unit and a fifth cushion block unit;
the main body unit is provided with threaded holes according to the mounting positions of the first cushion block unit, the second cushion block unit and the fifth cushion block unit, the threaded holes correspond to the threaded holes in the cushion block units one by one and are used for mounting and fixing the cushion block units; the first to sixth calibration hole units are holes formed in the main body unit; the first built-in embedding unit is a main body unit with a groove; the circle center of the opening of the first built-in embedded unit slotting is superposed with the circle center of the second calibration hole unit; the first separated embedded unit is a main body unit with a groove; the short edge of the first separated embedded unit slot is tangent to the center of the fifth calibration hole unit; the first cushion block unit, the second cushion block unit, the third cushion block unit, the fourth cushion block unit and the fifth cushion block unit are detachable.
2. The steel bar rusting device for three magnetic sensors of claim 1, wherein the first pad block unit, the second pad block unit, the third pad block unit, the fourth pad block unit and the fifth pad block unit are made of a transparent acrylic material.
3. The steel bar rusting device suitable for the three magnetic sensors as claimed in claim 1 or 2, wherein the first cushion block unit, the second cushion block unit, the third cushion block unit, the fourth cushion block unit and the fifth cushion block unit are used for placing external parts of the first, third, fourth, fifth and sixth calibration holes, namely external and separated sensors.
4. The apparatus for rusting a steel bar for three magnetic sensors of claim 1 or 2, wherein the foot of the body unit is provided with five screw holes for installing the first pad unit, the second pad unit, the third pad unit, the fourth pad unit and the fifth pad unit as a detachable member.
5. The steel bar rusting device for three magnetic sensors of claim 4, wherein the first cushion block unit, the second cushion block unit, the third cushion block unit, the fourth cushion block unit and the fifth cushion block unit are disassembly pieces, are provided with threaded holes, are arranged on the main body unit through bolts and are partially arranged according to the calibration requirement.
6. The steel bar rusting device for three magnetic sensors as claimed in claim 1 or 2, wherein the first calibrated hole unit, the second calibrated hole unit, the third calibrated hole unit, the fourth calibrated hole unit, the fifth calibrated hole unit and the sixth calibrated hole unit are cylindrical openings on the main body unit. The calibration of the common steel bar with the diameter of 14-20 mm in the field of buildings can be realized.
7. The steel bar rusting device for three magnetic sensors as claimed in claim 1 or 2, wherein the hole edge of each calibration hole unit is provided with a scale mark for calibrating the steel bar to ensure the calibration accuracy.
8. The steel bar corrosion device suitable for the three magnetic sensors as claimed in claim 1 or 2, wherein the second calibration hole unit is used for built-in sensor steel bar calibration; the first built-in embedding unit is a slot on the main body unit and is used for installing a built-in sensor, and the built-in sensor is a complete sensor structure and participates in steel bar calibration;
the fifth calibration hole unit is used for calibrating the separated sensor steel bars; the first separated embedded unit is a main body unit provided with a groove and used for installing a separated sensor embedded part, and the external part is arranged on the cushion block unit to assemble a complete separated sensor to participate in steel bar calibration;
the first calibration hole unit, the third calibration hole unit, the fourth calibration hole unit and the sixth calibration hole unit can be used for external sensor steel bar calibration; the first cushion block unit, the third cushion block unit, the fourth cushion block unit and the sixth cushion block unit are respectively matched with the first calibration hole unit, the third calibration hole unit, the fourth calibration hole unit and the sixth calibration hole unit to be used for installing an external sensor, and the external sensor is a complete sensor structure and participates in steel bar calibration.
9. The method for calibrating the steel bar corrosion device suitable for the three magnetic sensors according to claim 1, is characterized by comprising the following steps:
firstly, selecting a calibration hole according to a sensor participating in calibration; placing the device on a plane, installing the cushion block unit on the main body unit, and fixing the cushion block unit by using bolts; weighing the steel bar to be measured and then inserting the steel bar to be measured into the selected calibration hole; installing a sensor accessory: the separated and built-in sensors can directly install the built-in components into sensor grooves arranged in the device, and the external parts of the separated and built-out sensors are arranged on sensor cushion layers;
then, marking on the steel bar according to the position indicated by the calibration line of the edge of the calibration hole; using the sensor readings; taking out the steel bars and carrying out electrification corrosion; weighing after the corrosion is finished; reinserting the reinforcing steel bars into the calibration holes; correcting the position of the steel bar according to the scale marks and the marks on the steel bar to ensure that the position of the steel bar is consistent with that before the steel bar is taken out; reading again by using the sensor;
and finally, calibrating the steel bar corrosion condition according to the measured mass change and the magnetic induction intensity change.
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