CN113720755B - Reinforcing steel bar multi-point rust calibrating device and method suitable for built-in magnetic sensor - Google Patents
Reinforcing steel bar multi-point rust calibrating device and method suitable for built-in magnetic sensor Download PDFInfo
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- CN113720755B CN113720755B CN202110978826.5A CN202110978826A CN113720755B CN 113720755 B CN113720755 B CN 113720755B CN 202110978826 A CN202110978826 A CN 202110978826A CN 113720755 B CN113720755 B CN 113720755B
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- 229910001294 Reinforcing steel Inorganic materials 0.000 title claims abstract description 71
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 69
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000010276 construction Methods 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 57
- 239000010959 steel Substances 0.000 claims description 57
- 230000007797 corrosion Effects 0.000 claims description 36
- 238000005260 corrosion Methods 0.000 claims description 36
- 230000008859 change Effects 0.000 claims description 14
- 230000002787 reinforcement Effects 0.000 claims description 13
- 230000006698 induction Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical group [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 15
- 238000012544 monitoring process Methods 0.000 description 12
- 230000006872 improvement Effects 0.000 description 6
- 239000011150 reinforced concrete Substances 0.000 description 6
- 239000004567 concrete Substances 0.000 description 5
- 238000011065 in-situ storage Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000000053 physical method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000005672 electromagnetic field Effects 0.000 description 2
- 238000009659 non-destructive testing Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005293 ferrimagnetic effect Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000005298 paramagnetic effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012795 verification 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
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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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
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
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- Environmental Sciences (AREA)
- Health & Medical Sciences (AREA)
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- Analytical Chemistry (AREA)
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The device comprises a main body unit, a calibration hole unit, a built-in moving unit, an up-down moving unit, a first fixing unit and a second fixing unit, wherein the main body unit is a transparent outer frame, the up-down moving unit, the first fixing unit and the second fixing unit are arranged on the main body unit, and the calibration hole unit is a cylindrical opening on the main body unit and is used for calibrating the reinforcing steel bars in the field of construction; the built-in mobile unit is a slot on the main body unit, and the center of the slot opening of the built-in mobile unit coincides with the center of the calibration hole unit and is used for placing and installing the built-in magnetic sensor. And provides a reinforcing steel bar multi-point rust calibrating method suitable for the built-in magnetic sensor. The invention has simple operation, high accuracy, low cost and strong laboratory applicability, and is suitable for reinforcing steel bars with various sizes.
Description
Technical Field
The invention relates to a reinforcing steel bar calibration device and a calibration method in a reinforced concrete test, in particular to a reinforcing steel bar multi-point rust calibration device and a calibration method suitable for a built-in magnetic sensor.
Background
Reinforcement corrosion is one of the major problems with the durability of reinforced concrete structures. Therefore, the method for preventing and overhauling the steel bar corrosion of the structure is an effective method for solving the steel bar corrosion. At present, various nondestructive testing methods for steel bar corrosion are widely studied, wherein the physical method can reflect the steel bar corrosion from different physical parameters, and the nondestructive testing method is a research hot spot related to the steel bar corrosion measurement technology. Because the physical method is based on the basic motion law of the substance and the basic characteristics of the substance, the change condition of the substance can be reflected more. Therefore, the physical method is more suitable for in-situ testing of the corrosion of the steel bars, and the real corrosion condition of the steel bars in the concrete structure can be obtained in the in-situ testing. In the physical properties of the steel bar, the steel bar is ferromagnetic substances, and rust products of the steel bar are paramagnetic and ferrimagnetic substances, so that obvious differences exist in magnetic properties, in-situ test can be carried out on the rust condition of the steel bar from the magnetic direction, and the change of magnetic signals when the steel bar is corroded is obtained through the test. And the rust amount of the steel bar can be measured by establishing a relation between the change of the magnetic signal and the rust amount of the steel bar. Therefore, the method for measuring the rust state of the steel bar based on magnetism has important research significance for application in practical engineering.
The patent application publication No. CN108469514A, publication No. 2018, 8 and 31, entitled "monitoring equipment and method for reinforcement corrosion behavior in concrete", patent application publication No. CN208420791U, publication No. 2019, 1 and 22, entitled "a reinforcement corrosion electromagnetic field change response device", patent application publication No. CN 109374726A, publication No. 2019, 2 and 22, entitled "reinforcement corrosion nondestructive dynamic monitoring sensor and system in reinforcement corrosion in concrete based on magnetic field", patent application publication No. CN110646505A, publication No. 2020, 1 and 3, entitled "external reinforcement corrosion nondestructive monitoring sensor and testing method based on electromagnetic field principle", patent application publication No. CN112034033A, entitled "separation type reinforcement non-uniform corrosion monitoring sensor and testing method based on magnetic field principle", patent application publication No. 2020, and the above patent proposes several reinforcement corrosion monitoring sensors and monitoring methods based on magnetic field principle, which are used for monitoring the internal condition of reinforcement corrosion concrete structure. Rust monitoring sensors are commonly used for in situ monitoring of steel bars. In the laboratory verification stage of the sensor, the rust steel bar is required to be calibrated to determine the rust degree. The steel bar corrosion monitoring system related to the above patent lacks a moving and positioning device, and cannot realize steel bar in-situ corrosion monitoring.
The steel bar calibration needs higher precision, after the steel bar is shifted and weighed and is manually rusted, the relative positions of the steel bar and the sensor measuring head are required to be adjusted, so that the relative positions of the steel bar measuring point and the measuring head are completely consistent with those before shifting, and the magnetic induction reading can be 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.
Chinese patent application publication No. CN 113008976A, application publication No. 2021, 22 months, entitled "Reinforcement rust device and calibration method suitable for three magnetic sensors", which satisfies the calibration requirements of various types of sensors at the same time, but considers that the components of the built-in sensors need to be embedded in concrete in the actual application process of the sensors, and cannot calibrate the positions of the reinforcing bars; in addition, although the problem that the calibration precision of the reinforcing steel bars with different sizes cannot be guaranteed by manual correction is solved, the reinforcing steel bars to be calibrated cannot be guaranteed not to shake in the calibration process, so that the reinforcing steel bars to be calibrated are guaranteed to be kept fixed for improving the calibration precision.
A possible alternative is to use a device for movable positioning and a fixing device for fixing the reinforcing steel bars to be calibrated, and the movable positioning device can simultaneously realize the functions of moving and fixing the built-in magnetic sensor. Based on the theory, the Chinese patent grant bulletin number CN 208083922U, bulletin day 2018, 11 month 13, is named as a mobile linear guide rail positioning device, and mainly relates to the technical field of positioning equipment, but the positioning accuracy cannot be guaranteed when the equipment is positioned, and the positioning is easy to deviate. The method is mainly used in the field of equipment, and is only used as a reference for laboratory steel bar calibration.
Further, considering that the durability research of reinforced concrete is a popular field in recent years, many laboratories in China are performing the research of steel rust. A movable multi-point positioning calibration device for each size of reinforcing steel bar will provide a lot of convenience for the test.
The above problems are to be solved. Therefore, the reinforcing steel bar multi-point corrosion calibration device suitable for the built-in magnetic sensor is specially developed, has very important engineering value, can greatly improve the efficiency of laboratory reinforcing steel bar corrosion test, and helps research to be carried out smoothly.
Disclosure of Invention
In order to overcome the defect that the conventional test calibration device cannot be used for moving and positioning corrosion monitoring, the invention provides the corrosion reinforcing steel bar calibration device and the calibration method thereof, which are simple and convenient to operate, easy to detach, high in precision, low in cost and extremely high in laboratory applicability.
The technical scheme adopted for solving the technical problems is as follows:
The device comprises a main body unit, a calibration hole unit, a built-in moving unit, an up-down moving unit, a first fixing unit and a second fixing unit, wherein the main body unit is a transparent outer frame, the up-down moving unit, the first fixing unit and the second fixing unit are arranged on the main body unit, and the calibration hole unit is a cylindrical opening on the main body unit and is used for calibrating the reinforcing steel bars in the field of construction; the built-in mobile unit is a slot on the main body unit, and the center of the slot opening of the built-in mobile unit coincides with the center of the calibration hole unit and is used for placing and installing the built-in magnetic sensor.
Further, the main body unit is provided with threaded holes corresponding to the threaded holes on the up-down moving unit, the first fixing unit and the second fixing unit one by one according to the installation positions of the up-down moving unit, the first fixing unit and the second fixing unit, and the threaded holes are used for installing and fixing the up-down moving unit, the first fixing unit and the second fixing unit.
Still further, the main body unit is made of transparent acrylic material. The steel bar can be directly observed through the device in the calibration stage, so that experimental analysis is convenient. Other transparent environment-friendly light materials can be adopted to improve the cost performance of the device. 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.
Furthermore, the calibration hole unit can realize the calibration of the reinforcing steel bars with the diameter of 14-20 mm commonly used in the building field, and the calibration hole side of the calibration hole unit is provided with scale marks for calibrating the reinforcing steel bars and ensuring the calibration precision, and the calibration hole unit is used for calibrating the reinforcing steel bars of the built-in magnetic sensor.
In the built-in mobile unit, the built-in magnetic sensor is a complete sensor structure and participates in reinforcement calibration.
The up-down moving unit comprises an up-down polish rod, a trapezoid fixing piece, a linear rail and a concave sliding block; the upper polish rod and the lower polish rod are provided with scales, so that a tester can intuitively and accurately measure the displacement value of the built-in magnetic sensor after up-down movement, and the rust position of the steel bar to be calibrated can be accurately positioned; the trapezoid fixing piece is provided with three threaded through holes and is connected with the main body unit through bolts, and a round hole is formed in the middle of the trapezoid fixing piece, so that the upper polish rod and the lower polish rod pass through, and the upper polish rod and the lower polish rod are controlled and fixed conveniently; five threaded holes are formed in the linear guide rail and are used for being connected with the main body unit through bolts, grooves are formed in two sides of the linear guide rail, and the concave sliding block can slide up and down inside the linear guide rail; the concave sliding block is in threaded connection with the upper polish rod and the lower polish rod, four threaded through holes are formed in the middle of the concave sliding block, the concave sliding block is fixedly connected with the linear guide rail through bolts, two threaded through holes are formed in the bottom of the concave sliding block and are used for being fixedly connected with the built-in magnetic sensor, the concave sliding block is driven to slide up and down on the linear guide rail through controlling the upper polish rod and the lower polish rod, and therefore the built-in magnetic sensor moves up and down.
The first fixing unit comprises a first arc-shaped fixing clamp, a first screw rod and a first locking nut; the left side and the right side of the first circular arc-shaped fixing clamp are respectively provided with a fixing surface and a threaded hole for fixing the upper polished rod and the lower polished rod, and the fixing surface is provided with the threaded hole for fixing the main body unit; the first screw rod is connected with the first locking nut through the threaded hole, and the first circular arc-shaped fixing clamp fixing surface and the first screw rod are in close contact with the left and right surfaces of the upper polish rod and the lower polish rod;
The second fixing unit comprises a second arc-shaped fixing clamp, a second screw rod and a second locking nut; the left side and the right side of the second circular arc-shaped fixing clamp are respectively provided with a fixing surface and a threaded hole for fixing the reinforcing steel bars to be calibrated, and the fixing surface is provided with a threaded hole for fixing the reinforcing steel bars to be calibrated with the main body unit; the second screw rod is connected with the second locking nut through the threaded hole, and the second circular arc-shaped fixing clamp fixing surface and the second screw rod are in close contact with the left surface and the right surface of the steel bar to be calibrated.
As an improvement, the upper polish rod and the lower polish rod are provided with scales, so that a tester can intuitively and accurately measure the up-down movement length value of the built-in magnetic sensor, and the rust position of the steel bar can be accurately positioned. As an improvement, the linear guide rail adopts chromium bearing steel, and grooves are formed in two sides of the linear guide rail so as to enable the concave sliding block to slide up and down inside; the concave sliding block is smooth in surface, the inner side of the sliding block is provided with a groove for being connected with the linear guide rail, the outer side of the sliding block is provided with a groove for ensuring that the magnetic sensor is embedded into the concave sliding block, and the bottom of the sliding block is provided with a threaded through hole for being fixed with the built-in magnetic sensor.
A method for calibrating a reinforcing steel bar multi-point rust device suitable for a built-in magnetic sensor comprises the following steps:
Firstly, placing the device on a plane, weighing a reinforcing steel bar to be calibrated, inserting the reinforcing steel bar into a calibration hole, and fixing the reinforcing steel bar through a second fixing unit; installing a sensor fitting: the built-in sensor is put into the device and connected with the concave sliding block; the position of the built-in sensor is adjusted by moving the upper polish rod and the lower polish rod, the upper polish rod and the lower polish rod are fixed by a first circular arc fixing clamp, and the moving distance of the built-in sensor is recorded according to the marks of the upper polish rod and the lower polish rod;
then, marking the steel bar according to the positions pointed by the marks marked by Kong Kongbian; using the sensor readings; taking out the steel bars to carry out electrified corrosion; weighing after rust corrosion is completed; reinserting the reinforcing steel bars into the calibration holes; correcting the positions of the reinforcing steel bars according to the scale marks and marks on the reinforcing steel bars, and ensuring that the positions of the reinforcing steel bars are consistent with those before taking out; again using the sensor to take readings;
And finally, calibrating the corrosion condition of the steel bar according to the measured quality change and the magnetic induction intensity change.
It should be noted that when next calibration is performed, rust at different positions of the steel bar is tested, only the position of the built-in magnetic sensor is required to be moved, the first screw rod is screwed out, and the upper and lower polished rods can move up and down along the first circular arc-shaped fixing clamp, so that the built-in magnetic sensor moves up and down along the up and down moving unit. And the rust of the reinforcing steel bars with various sizes is tested, and the reinforcing steel bars with different sizes are only required to be put into the calibration hole unit, the second screw rod is screwed out, and the reinforcing steel bars to be calibrated are fixed by the second circular arc-shaped fixing clamp, so that the reinforcing steel bars are not swayed when being calibrated, and the calibration accuracy is improved.
The beneficial effects of the invention are mainly shown in the following steps: the invention can overcome the defects of difficult operation and low precision in the calibration process in the laboratory environment, breaks through the limitation of the traditional embedded sensor calibration test method, and realizes the accurate positioning of the movement of the built-in magnetic sensor and the corrosion of each position of the steel bar; the method has the advantages of clear principle, simple and convenient method, accurate positioning, repeated use, good stability and the like, and can make up for the defects of the conventional steel bar corrosion calibration device.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a reinforcing steel bar multi-point rust calibrating device suitable for a built-in magnetic sensor.
Fig. 2 is a schematic diagram of the overall structure of the up-and-down moving unit of the reinforcing steel bar multi-point rust calibrating device suitable for the built-in magnetic sensor.
Fig. 3 is a three-view diagram of a reinforcing bar multi-point rust calibrating device suitable for a built-in magnetic sensor, wherein (a) is a front view, (b) is a right view, and (c) is a top view.
Fig. 4 is a three-view of a main body unit of the reinforcing steel bar multi-point rust calibrating device suitable for the built-in magnetic sensor. Wherein (a) is a front view, (b) is a right view, and (c) is a top view.
Fig. 5 is a schematic diagram of a slot of a built-in mobile unit.
Fig. 6 is a three-view of the built-in sensor, in which (a) is a front view, (b) is a right view, and (c) is a top view.
Fig. 7 is a three-view of a circular arc fixing unit of the reinforcing steel bar multi-point rust calibrating device suitable for the built-in magnetic sensor. Wherein (a) is a front view, (b) is a right view, and (c) is a top view.
Fig. 8 is a three-view of an up-and-down moving unit of the reinforcing steel bar multi-point rust calibrating device suitable for the built-in magnetic sensor. Wherein (a) is a front view, (b) is a right view, and (c) is a top view.
Fig. 9 is a three-view of the upper and lower polish rod and the concave slider of the up and down moving unit. Wherein (a) is a front view, (b) is a right view, and (c) is a top view.
Fig. 10 is a three-view of the ladder type fixing member of the up-down moving unit. Wherein (a) is a front view, (b) is a right view, and (c) is a top view.
Fig. 11 is a three-view of the up-down moving unit linear guide. Wherein (a) is a front view, (b) is a right view, and (c) is a top view.
Reference numerals in the drawings: 1. a main body unit; 2. calibrating a hole unit; 3. a built-in mobile unit; 4. an up-and-down moving unit; 5. a first fixing unit; 6. a second fixing unit; 7. grooving the built-in mobile unit; 8. scale marks; 9. an upper polish rod and a lower polish rod; 10. a trapezoidal fixing member; 11. a concave slider; 12. a linear guide rail; 13. a first bolt unit; 14. a second bolt unit; 15. a third bolt unit; 16. a fourth bolt unit; 17. a fifth bolt unit; 18. a sixth bolt unit; 19. a seventh bolt unit; 20. an eighth bolt unit; 21. a ninth bolt unit; 22. a tenth bolt unit; 23. an eleventh bolt unit; 24. a twelfth bolt unit; 25. a thirteenth bolt unit; 26. a fourteenth bolt unit; 27. a fifteenth bolt unit; 28. a first screw hole unit; 29. a second screw hole unit; 30. a third screw hole unit; 31. a fourth screw hole unit; 32. a fifth screw hole unit; 33. a sixth screw hole unit; 34. a seventh screw hole unit; 35. an eighth screw hole unit; 36. a ninth screw hole unit; 37. a tenth screw hole unit; 38. an eleventh screw hole unit; 39. a twelfth screw hole unit; 40. a thirteenth screw hole unit; 41. a fourteenth screw hole unit; 42. a fifteenth screw hole unit; 43. a first lock nut; 44. a second lock nut; 45. a first circular arc-shaped fixing clip; 46. a second circular arc-shaped fixing clamp; 47. a first screw; 48. and a second screw.
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 refer to the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description of the present invention and are not required to be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Referring to fig. 1 to 11, a reinforcing bar multi-point rust calibrating device suitable for a built-in magnetic sensor includes a main body unit 1, a calibrating hole unit 2, a built-in moving unit 3, an up-down moving unit 4, a first fixing unit 5 and a second fixing unit 6.
The main body unit 1 is made of transparent acrylic material. The steel bar can be directly observed through the device in the calibration stage, so that experimental analysis is convenient. Other transparent environment-friendly light materials can be adopted to improve the cost performance of the device. Preferably, the main body unit 1 can also be made of other transparent environment-friendly light materials so as to meet the cost performance requirement of the calibration device.
Screw holes are formed in the main body unit 1 according to the installation positions of the up-and-down moving unit 4, the first fixing unit 5 and the second fixing unit 6, and correspond to the screw holes in the up-and-down moving unit 4, the first fixing unit 5 and the second fixing unit 6 one by one, so that the main body unit is used for installing and fixing the up-and-down moving unit 4, the first fixing unit 5 and the second fixing unit 6;
The calibration hole unit 2 is a cylindrical opening on the main body unit 1. Can realize the calibration of the steel bars with the diameters of 14-20 mm commonly used in the building field. The calibration hole unit 2 is equipped with scale mark 8 on the hole limit for calibration reinforcing bar ensures the calibration precision. The calibration hole unit 2 is used for calibrating the built-in magnetic sensor reinforcing steel bars;
The built-in moving unit 3 is a slot on the main body unit 1, and the center of the slot opening of the built-in moving unit 3 is overlapped with the center of the calibration hole unit 2; the built-in magnetic sensor is used for being placed in and installed, and the built-in magnetic sensor is a complete sensor structure and participates in reinforcement calibration;
the up-down moving unit 4 comprises an up-down polish rod 9, a trapezoid fixing piece 10, a linear rail 12 and a concave sliding block 11; the upper polish rod 9 and the lower polish rod 9 are provided with scales, so that a tester can intuitively and accurately measure the displacement value of the built-in magnetic sensor after up-down movement, and the accurate positioning of the corrosion position of the steel bar to be calibrated is realized; the trapezoid fixing piece 10 is provided with three threaded through holes and is connected with the main body unit 1 through bolts, and a round hole is formed in the middle of the trapezoid fixing piece 10, so that the upper polish rod 9 and the lower polish rod 9 pass through, and the upper polish rod 9 and the lower polish rod 9 are controlled and fixed conveniently; five threaded holes are formed in the linear guide rail 12 and are used for being connected with the main body unit 1 through bolts, grooves are formed in two sides of the linear guide rail 12, and the concave sliding block 11 can slide up and down inside; the concave sliding block 11 is in threaded connection with the upper polish rod 9 and the lower polish rod 9, four threaded through holes are formed in the middle of the concave sliding block 11, the concave sliding block 11 is fixedly connected with the linear guide rail 12 through bolts, two threaded through holes are formed in the bottom of the concave sliding block and are used for being fixedly connected with the built-in magnetic sensor, the concave sliding block 11 is driven to slide up and down on the linear guide rail 12 through controlling the upper polish rod 9, and therefore the built-in magnetic sensor moves up and down.
The first fixing unit 5 comprises a first circular arc-shaped fixing clamp 45, a first screw 47 and a first locking nut 43; the left side and the right side of the first circular arc-shaped fixing clamp 45 are respectively provided with a fixing surface and a threaded hole for fixing the upper polish rod 9 and the lower polish rod 9, and the fixing surface is provided with a threaded hole for fixing the main body unit 1; the first screw rod 47 is connected with the first locking nut 43 through the threaded hole, and the fixing surface of the first circular arc-shaped fixing clamp 45 and the first screw rod 47 are in close contact with the left and right surfaces of the upper polish rod 9 and the lower polish rod 9;
The second fixing unit 6 comprises a second circular arc-shaped fixing clamp 46, a second screw 48 and a second locking nut 44; the left side and the right side of the second circular arc-shaped fixing clamp 46 are respectively provided with a fixing surface and a threaded hole for fixing the reinforcing steel bars to be calibrated, and the fixing surface is provided with a threaded hole for fixing the reinforcing steel bars to be calibrated with the main body unit 1; the second screw 48 is connected with the second locking nut 44 through the threaded hole, and the fixing surface of the second circular arc-shaped fixing clamp 46 and the second screw 48 are in close contact with the left and right surfaces of the steel bars to be calibrated.
As an improvement, the upper and lower polish rods 9 are provided with scales, so that a tester can intuitively and accurately measure the up-and-down moving length value of the built-in magnetic sensor, and the rust position of the steel bar can be accurately positioned.
As an improvement, the linear guide rail 12 of the present invention adopts chromium bearing steel, and grooves are formed on both sides of the linear guide rail 12 to allow the concave slider 11 to slide up and down inside.
As an improvement, the concave sliding block 11 has smooth surface, the inner side of the sliding block 11 is provided with a groove for connecting with the linear guide rail 12, the outer side of the sliding block 11 is provided with a groove for ensuring that the magnetic sensor is embedded into the concave sliding block 11, and the bottom of the sliding block 11 is provided with a threaded through hole for fixing with the built-in magnetic sensor.
As an improvement, two sides of the first arc fixing clamp 45 and the second arc fixing clamp 46 are respectively provided with a fixing surface and a threaded hole, and the fixing surface, the first screw 47 and the second screw 48 are tightly contacted with the upper polished rod 9, the lower polished rod 9 and the steel bars to be calibrated through the threaded holes, so that the first arc fixing clamp 45 and the second arc fixing clamp 46 are fixed with the upper polished rod 9, the lower polished rod 9 and the steel bars to be calibrated.
A calibration method of a reinforcing steel bar multi-point rust calibration device suitable for a built-in magnetic sensor comprises the following steps:
The calibration device is prepared by placing the device main body unit 1 of the invention on a non-inclined plane.
First, a sensor fitting is installed: the built-in magnetic sensor is put into the main body unit 1 from the built-in moving unit slot 7, the built-in moving unit 3 is embedded into the concave sliding block 11 and is arranged on the up-down moving unit 4; the position of the built-in magnetic sensor is adjusted by moving the upper and lower polished rods 9, the upper and lower polished rods 9 are fixed by adjusting the first lock nuts 43 through the first arc-shaped fixing clips 45, and the moving distance of the built-in magnetic sensor is recorded according to the indication of scale marks of the upper and lower polished rods 9;
Then, the reinforcing steel bars to be calibrated are weighed and then inserted into the calibration hole unit 2, the reinforcing steel bars are marked according to the positions pointed by the calibration Kong Kongbian graduation marks 8, and the reinforcing steel bars to be calibrated are fixed through the second fixing unit 6;
reading by using a built-in sensor; taking out the steel bars to carry out electrified corrosion; weighing the steel bars again after the rust is finished; reinserting the reinforcing steel bars into the calibrated hole unit 2; correcting the positions of the reinforcing steel bars according to the scale marks 8 and marks on the reinforcing steel bars, and ensuring that the positions of the reinforcing steel bars are consistent with those before taking out; again using the built-in magnetic sensor to take readings;
And finally, calibrating the corrosion condition of the steel bar according to the measured quality change and the magnetic induction intensity change.
It should be noted that, when the next calibration is performed, rust at different positions of the steel bar is tested, only the position of the built-in magnetic sensor is required to be moved, the first screw 47 is screwed out, and the upper and lower polished rod 9 can be moved up and down along the first circular arc-shaped fixing clip 45, so that the built-in magnetic sensor is moved up and down along the up and down moving unit 4. And the corrosion of the reinforcing steel bars with various sizes is tested, and the reinforcing steel bars with different sizes are only required to be put into the calibration hole unit 2, the second screw 48 is screwed out, and the reinforcing steel bars to be calibrated are fixed by the second circular arc-shaped fixing clamp 46, so that the reinforcing steel bars are not swayed when being calibrated, and the calibration accuracy is improved.
The specific calibration calculation formula is as follows:
1. recording magnetic induction intensity data B iI of a calibration steel bar before rust of a reinforced concrete test piece, wherein the mass of the test piece is m iI, I is the power-on time, I is the power-on front label, and II is the power-on rear label;
2. The simulation experiment of steel bar corrosion is realized in a current acceleration corrosion mode, the current density and the power-on time are controlled to be the same, and the reinforced concrete test pieces corresponding to the mass m iI are respectively electrified for i days;
3. recording magnetic induction intensity data B iII and reinforcing steel bar quality data m iII of the calibrated reinforcing steel bars after the reinforced concrete test pieces are corroded;
calculating the mass change rate delta m i of the calibration steel bar respectively, wherein the calculation formula is shown as formula (1);
calculating the change rate delta B i of the magnetic induction intensity of the calibration reinforcing steel bars respectively, wherein the calculation formula is (2)
And (3) performing linear fitting on the relation between the steel bar quality change rate and the magnetic induction intensity change rate of the Hall sensor to obtain a linear relation coefficient alpha, and completing calibration.
In specific implementation, the invention does not limit the specific device model, as long as the components can complete the functions.
The embodiments described in this specification are merely illustrative of the manner in which the inventive concepts may be implemented. The scope of the present invention should not be construed as being limited to the specific forms set forth in the embodiments, but the scope of the present invention and the equivalents thereof as would occur to one skilled in the art based on the inventive concept.
Claims (6)
1. The device is characterized by comprising a main body unit, a calibration hole unit, a built-in moving unit, an up-down moving unit, a first fixing unit and a second fixing unit, wherein the main body unit is a transparent outer frame, the up-down moving unit, the first fixing unit and the second fixing unit are arranged on the main body unit, and the calibration hole unit is a cylindrical opening on the main body unit and is used for calibrating the reinforcing steel bars in the field of construction; the built-in mobile unit is a slot on the main body unit, and the center of the slot opening of the built-in mobile unit coincides with the center of the calibration hole unit and is used for placing and installing the built-in magnetic sensor;
The main body unit is provided with threaded holes corresponding to the threaded holes on the up-down moving unit, the first fixing unit and the second fixing unit one by one according to the installation positions of the up-down moving unit, the first fixing unit and the second fixing unit, and is used for installing and fixing the up-down moving unit, the first fixing unit and the second fixing unit;
The up-down moving unit comprises an up-down polish rod, a trapezoid fixing piece, a linear guide rail and a concave sliding block; the upper polish rod and the lower polish rod are provided with scales; the trapezoid fixing piece is provided with three threaded through holes and is connected with the main body unit through bolts, and a round hole is formed in the middle of the trapezoid fixing piece, so that the upper polish rod and the lower polish rod pass through, and the upper polish rod and the lower polish rod are controlled and fixed conveniently; five threaded holes are formed in the linear guide rail and are used for being connected with the main body unit through bolts, and grooves are formed in two sides of the linear guide rail so that the concave sliding block can slide up and down inside the linear guide rail; the concave sliding block is in threaded connection with the upper polish rod and the lower polish rod, four threaded through holes are formed in the middle of the concave sliding block, the concave sliding block is fixedly connected with the linear guide rail through bolts, two threaded through holes are formed in the bottom of the concave sliding block and are used for being fixedly connected with the built-in magnetic sensor, and the concave sliding block is driven to slide up and down on the linear guide rail through controlling the upper polish rod and the lower polish rod, so that the built-in magnetic sensor moves up and down;
The first fixing unit comprises a first circular arc-shaped fixing clamp, a first screw rod and a first locking nut; the left side and the right side of the first circular arc-shaped fixing clamp are respectively provided with a fixing surface and a threaded hole for fixing the upper polished rod and the lower polished rod, and the fixing surface is provided with the threaded hole for fixing the main body unit; the first screw rod is connected with the first locking nut through the threaded hole, and the first circular arc-shaped fixing clamp fixing surface and the first screw rod are in close contact with the left and right surfaces of the upper polish rod and the lower polish rod;
The second fixing unit comprises a second circular arc-shaped fixing clamp, a second screw rod and a second locking nut; the left side and the right side of the second circular arc-shaped fixing clamp are respectively provided with a fixing surface and a threaded hole for fixing the reinforcing steel bars to be calibrated, and the fixing surface is provided with a threaded hole for fixing the reinforcing steel bars to be calibrated with the main body unit; the second screw rod is connected with the second locking nut through the threaded hole, and the second circular arc-shaped fixing clamp fixing surface and the second screw rod are in close contact with the left surface and the right surface of the steel bar to be calibrated.
2. The reinforcing steel bar multipoint rust calibrating device suitable for the built-in magnetic sensor according to claim 1, wherein the main body unit is made of transparent acrylic material.
3. The reinforcing steel bar multi-point rust calibrating device suitable for the built-in magnetic sensor according to claim 1, wherein the calibrating hole unit is a cylindrical opening on the main body unit, the calibrating of the reinforcing steel bar with the diameter of 14-20 mm in the building field can be realized, and the calibrating hole side of the calibrating hole unit is provided with scale marks.
4. The reinforcing steel bar multi-point rust calibrating device suitable for a built-in magnetic sensor according to claim 1, wherein the upper polish rod and the lower polish rod are provided with scales.
5. The reinforcing steel bar multi-point rust calibrating device suitable for the built-in magnetic sensor according to claim 1, wherein the linear guide rail is made of chromium bearing steel, and grooves are formed on two sides of the linear guide rail for the concave sliding block to slide up and down inside; the concave sliding block is smooth in surface, the inner side of the sliding block is provided with a groove for being connected with the linear guide rail, the outer side of the sliding block is provided with a groove for ensuring that the magnetic sensor is embedded into the concave sliding block, and the bottom of the sliding block is provided with a threaded through hole for being fixed with the built-in magnetic sensor.
6. The calibration method for the reinforcement multi-point rust calibration device suitable for the built-in magnetic sensor according to claim 1, wherein the calibration method comprises the following steps:
Firstly, placing the device on a plane, weighing a reinforcing steel bar to be calibrated, inserting the reinforcing steel bar into a calibration hole, and fixing the reinforcing steel bar through a second fixing unit; installing a sensor fitting: the built-in sensor is put into the device and connected with the concave sliding block; the position of the built-in sensor is adjusted by moving the upper polish rod and the lower polish rod, the upper polish rod and the lower polish rod are fixed by a first circular arc fixing clamp, and the moving distance of the built-in sensor is recorded according to the marks of the upper polish rod and the lower polish rod;
then, marking the steel bar according to the positions pointed by the marks marked by Kong Kongbian; using the sensor readings; taking out the steel bars to carry out electrified corrosion; weighing after rust corrosion is completed; reinserting the reinforcing steel bars into the calibration holes; correcting the positions of the reinforcing steel bars according to the scale marks and marks on the reinforcing steel bars, and ensuring that the positions of the reinforcing steel bars are consistent with those before taking out; again using the sensor to take readings;
And finally, calibrating the corrosion condition of the steel bar according to the measured quality change and the magnetic induction intensity change.
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| CN110646504B (en) * | 2019-10-18 | 2023-12-26 | 浙江工业大学 | External steel bar corrosion in-situ nondestructive monitoring test device based on electromagnetic field principle |
| CN113008976B (en) * | 2021-03-30 | 2024-04-16 | 浙江工业大学 | Reinforcing steel bar corrosion calibration device and method suitable for three magnetic sensors |
| CN113125551B (en) * | 2021-03-31 | 2023-11-03 | 浙江工业大学 | Built-in magnetic sensor with double magnetic circuits and four measuring points and testing method thereof |
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