CN216433861U - Range finding adjustable reinforcing bar corrosion magnetic induction sensor - Google Patents
Range finding adjustable reinforcing bar corrosion magnetic induction sensor Download PDFInfo
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- CN216433861U CN216433861U CN202122007788.7U CN202122007788U CN216433861U CN 216433861 U CN216433861 U CN 216433861U CN 202122007788 U CN202122007788 U CN 202122007788U CN 216433861 U CN216433861 U CN 216433861U
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Abstract
A distance-measuring adjustable steel bar corrosion magnetic induction sensor comprises a distance-measuring adjustable magnetic induction intensity monitoring unit and a data processing unit, wherein in the distance-measuring adjustable magnetic induction intensity detecting unit, a coil is uniformly wound on a magnetic core system, two ends of the coil are connected with a signal input end of a signal generator, the middle position of a to-be-tested part clamped by a fixing unit corresponds to the middle position of a bayonet of a magnetic core, and a first Hall sensor and a second Hall sensor are symmetrically arranged by taking the central line of the bayonet as an axis; in the magnetic core system, a slidable magnetic core sheath and a slidable magnetic core are integrated, the slidable magnetic core sheath is used for connecting and fixing the slidable magnetic core and the fixed magnetic core, and the slidable magnetic core and the fixed magnetic core are mutually attracted by a magnet. The utility model discloses change magnetic core bayonet socket distance according to the embedding degree of depth immediately, effectively detect the single detection reinforcing bar corrosion condition in different reinforced concrete square column edges, broken through in the past the restriction that single sensor only corresponds specific protective layer thickness concrete reinforcing bar and detects, improved convenience and rate of utilization.
Description
Technical Field
The utility model belongs to the technical field of reinforced concrete structure durability test, especially, relate to a range finding adjustable reinforcing bar corrosion magnetic induction sensor.
Background
Concrete damage caused by steel bar corrosion is many cases worldwide, especially in countries with earlier modernization construction. Due to lack of awareness of durability problems, the economic losses caused by corrosion of steel bars are enormous. Therefore, research on the non-uniform corrosion detection technology of the steel bars is an urgent need for social development. Considering that the reinforced concrete structure is still widely applied to urbanization and infrastructure construction in China for a long time in the future. On the basis of the large premise, how to quantify the representation and accurately monitor the steel bar corrosion degree in the reinforced concrete structure, and effectively improve the monitoring precision of the steel bar corrosion, so that the whole service life of the reinforced concrete structure is predicted, and a reasonable reinforced concrete structure assessment and maintenance scheme is formulated according to the prediction, thereby having important significance for guaranteeing the safety of the concrete structure.
The evaluation method of the corrosion of the steel bar in the concrete is generally divided into a damage Detection (DT) method and a non-destructive detection (NDT) method. The conventional breakage detection method (DT) requires appropriate breakage of a reinforced concrete specimen and removal of a reinforcing steel bar, and then determines the degree of corrosion of the embedded reinforcing steel bar by measuring the weight and mass loss of the reinforcing steel bar or the volume loss or the cross-sectional area reduction area by three-dimensional laser scanning. Although accurate, the damage detection has obvious disadvantages, and the damage detection is premised on the damage of the concrete structure, so that the members and the structure end the service state in advance, which greatly limits the wide application of the damage detection. The nondestructive testing method is a hotspot of current research, wherein a reinforcing steel bar corrosion monitoring method based on a magnetic field principle is disclosed in China patent application No. CN110646505A, published as 1 month and 3 days in 2020, entitled "external reinforcing steel bar corrosion nondestructive monitoring sensor based on an electromagnetic field principle and testing method", Chinese patent application No. CN112034035A, published as 12 months and 4 days in 2020, entitled "external reinforcing steel bar corrosion nondestructive monitoring sensor based on an electromagnetic field principle and testing method", and both the two patents provide a reinforcing steel bar corrosion monitoring sensor externally arranged on concrete for monitoring the reinforcing steel bar corrosion condition of specific concrete, but the actual concrete columns are different in size, the sensor can only clamp the reinforcing steel bar concrete column with a single size, and a single sensor is only used corresponding to the concrete reinforcing steel bar with a specific protective layer thickness, so that the cost is high and the carrying is inconvenient. To sum up, the sensor that this patent relates can not change magnetic core bayonet socket distance in time, can't block the corrosion degree that every reinforced concrete post is used for predicting the reinforcing bar under the different conditions high-efficiently.
Therefore, the designed sensor has the advantages that the size of the bayonet is variable, the bayonet distance of the magnetic core can be changed instantly according to the embedding depth, and the sensor can be used for testing the corrosion of concrete steel bars with different protective layer thicknesses. The method aims to ensure that different concrete members and structures are detected and monitored on the premise of no damage, is applied to detecting and monitoring the corrosion of the steel bars in the concrete, has the advantages of convenience, usability, multifunctionality and the like, and greatly improves the efficiency and the use value of the corrosion detection of the concrete steel bars with different protective layer thicknesses.
Disclosure of Invention
In order to overcome the not enough of existing reinforcing bar corrosion nondestructive monitoring technique, the utility model provides a simple operation, function are comprehensive, can realize external reinforcing bar corrosion monitoring, especially relate to the reinforcing bar corrosion monitoring technique of using different protective layer thickness concrete: the distance-measuring adjustable steel bar corrosion magnetic induction sensor is externally arranged outside the reinforced concrete structure so as to adapt to the reinforced concrete square columns with different protective layer thicknesses; the method can effectively detect the corrosion condition of a single detection steel bar at the edge of different reinforced concrete square columns so as to solve the problem of the corrosion rate of the steel bar of the reinforced concrete material.
The utility model provides a technical scheme that its technical problem adopted is:
a distance-measuring adjustable steel bar corrosion magnetic induction sensor comprises a distance-measuring adjustable magnetic induction intensity monitoring unit and a data processing unit, wherein the distance-measuring adjustable magnetic induction intensity detecting unit comprises a signal generator, a coil, a magnetic core system, a first Hall sensor and a second Hall sensor, the coil is uniformly wound on the magnetic core system, two ends of the coil are connected with a signal input end of the signal generator, the middle position of a to-be-tested piece clamped by a fixing unit corresponds to the middle position of a magnetic core bayonet, and the first Hall sensor and the second Hall sensor are symmetrically arranged by taking a bayonet central line as an axis; the magnetic core body system comprises a fixed magnetic core, a slidable magnetic core sheath and a magnet, wherein the slidable magnetic core sheath and the slidable magnetic core are integrated into a whole, the slidable magnetic core and the fixed magnetic core are fixedly connected through the integrated slidable magnetic core sheath, and the slidable magnetic core and the fixed magnetic core are mutually attracted by the magnet.
Further, fixed magnetic core and slidable magnetic core be the silicon steel material, slidable magnetic core sheath be the plastics material.
Preferably, the magnetic core body system comprises an insulating handle, the insulating handle is arranged at the long edge end of the fixed magnetic core, and the insulating handle is a handle made of rubber insulating materials.
Still further, slidable magnetic core sheath on have preformed hole and bolt, the bolt is screwed up fixedly in the preformed hole slidable magnetic core sheath and slidable magnetic core.
Further, fixed magnetic core and slidable magnetic core be trapezoidal bayonet socket, can firmly block in the edge of waiting to test the piece, accomplish the monitoring to the corrosion of single reinforcing bar that awaits measuring, and can change the magnetic core bayonet socket distance according to the embedding degree of depth immediately, block not unidimensional reinforced concrete column.
To the defect of traditional reinforcing bar corrosion monitoring technology, the utility model provides a range finding adjustable reinforcing bar corrosion magnetic induction sensor tries to study the nondestructive monitoring technique of different protective layer thickness concrete reinforcing bar corrosion. Based on the magnetic medium theory, the steel bar corrosion magnetic induction sensor with adjustable distance measurement is developed by utilizing the great difference of the magnetic conductivity of the non-corroded steel bar and the corrosion product, the steel bar corrosion process of the reinforced concrete square column with different protective layer thicknesses is jointly monitored, the sensor is simple to operate, one machine has multiple purposes, and the sensor has high use value and benefit.
The beneficial effects of the utility model are that: the scheme is based on a nondestructive testing method, the electromagnetic induction technology is used for realizing nondestructive monitoring of steel bar corrosion, and the corrosion monitoring can be carried out on concrete steel bars with various protective layer thicknesses by using a single sensor, so that the non-uniform corrosion parameters of the steel bars can be accurately analyzed. The limit that a single sensor only corresponds to the detection of the concrete reinforcing steel bar with the specific protective layer thickness in the prior art is broken through, and the convenience and the utilization rate are improved; the measured corrosion rate of the steel bars can be applied to the evaluation of the current service performance and the prediction of the durability of the reinforced concrete structure. The test object can be suitable for reinforced concrete square columns and the like with different sizes, has the advantages of convenience in carrying, high measuring speed, reusability, good stability and the like, and can make up the defect of the existing equipment in measuring the corrosion rate of the reinforcing steel bars.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a detailed cross-sectional view of the slidable magnetic core 1-1 of the present invention.
Fig. 3 shows an original conventional magnetic induction sensor.
Fig. 4 is the utility model discloses a bayonet socket width increase sensor testing result picture of slidable magnetic core.
Wherein, 1 is a magnetic core system, 21 is a first hall sensor, 22 is a second hall sensor, 3 is a coil, 4 is a piece to be tested, 41 is a steel bar to be tested, 5 is a signal generator, 6 is a data processing unit, 7 is an insulating handle, 11 is a fixed magnetic core, 12 is a slidable magnetic core, 13 is a slidable magnetic core sheath, 14 is a magnet, 131 is a reserved hole, and 132 is a bolt.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, 2 and 4, the distance-measuring adjustable steel bar corrosion magnetic induction sensor comprises a distance-measuring adjustable magnetic induction intensity monitoring unit and a data processing unit 6; the distance-measuring adjustable magnetic induction intensity detection unit comprises a signal generator 5, a coil 3, a magnetic core system 1, an insulating handle 7, a first Hall sensor 21 and a second Hall sensor 22; the coil 3 is uniformly wound on the magnetic core system 1, and two ends of the coil 3 are connected with a signal input end of a signal generator 5; the middle position of the to-be-tested part 4 clamped by the fixing unit corresponds to the middle position of the bayonet of the magnetic core; the first Hall sensor 21 and the second Hall sensor 22 are symmetrically arranged by taking a bayonet center line as an axis; the magnetic core system 1 comprises a fixed magnetic core 11, a slidable magnetic core 12, a slidable magnetic core sheath 13 and a magnet 14, wherein the slidable magnetic core sheath 13 and the slidable magnetic core 12 are integrally formed, the slidable magnetic core sheath 13 connects and fixes the slidable magnetic core 12 and the fixed magnetic core 11, and the magnet 14 attracts the slidable magnetic core 12 and the fixed magnetic core 11 mutually.
The fixed magnetic core 11 and the slidable magnetic core 12 are made of silicon steel; the slidable magnetic core sheath 13 is made of plastic; the slidable magnetic core sheath 13 is provided with a preformed hole 131 and a bolt 132; the insulating handle 7 is a handle made of rubber insulating materials at the long side end of the fixed magnetic core 11.
The slidable magnetic core 12 and the slidable magnetic core sheath 13 are formed into a whole, the slidable magnetic core sheath 13 tightly sleeves the slidable magnetic core 12 and the fixed magnetic core 11 up and down, the bolt 132 is screwed in the preformed hole 131, and the magnet 14 mutually attracts the slidable magnetic core 12 and the fixed magnetic core 11;
fixed magnetic core 11 and slidable magnetic core 12 be trapezoidal bayonet socket, can firmly block in waiting to test the edge of piece 4, accomplish the monitoring of 41 corrosion of single reinforcing bar that awaits measuring, and can change the magnetic core bayonet socket distance according to the embedding degree of depth immediately, block not unidimensional reinforced concrete column.
In this embodiment, change the bayonet socket size through adjusting slidable magnetic core 12 to this reinforced concrete that adapts to different protective layer thicknesses treats test piece 4, tries just can carry out the corrosion monitoring to multiple different protective layer thickness concrete reinforcing bar with single sensor, from and can accurate quick analysis reinforcing bar inhomogeneous corrosion parameter. The slidable magnetic core 12 can be adjusted to measure the distance at will according to the thickness of the protective layer of the reinforced concrete test piece, so that one machine with multiple purposes is realized; the detection data are obtained through the first Hall sensor 21, the second Hall sensor 22 and the signal generator 5 connected with the coil 3 and are transmitted to the data processing unit 7, the monitoring comprehensiveness and convenience are guaranteed, and a new thought is provided for monitoring corrosion of concrete steel bars with different protective layer thicknesses; the device breaks through the limitation that a single sensor only corresponds to the concrete reinforcing steel bar with the specific protective layer thickness in the prior art, and improves convenience and utilization rate.
The magnetic induction sensor of the present embodiment was used for testing: design protective layer thickness respectively and be 10mm, 20mm, 30 mm's reinforced concrete square column test piece, the reinforcing bar diameter is 16mm length and is 20 cm's HPB300 plain circular steel bar, and the raw and other materials of concrete are: the cement is P.I 525 grade Portland cement, the sand adopts river sand with fineness modulus of 2.6, the coarse aggregate adopts continuous graded broken stone (the maximum grain diameter is 25mm), the water adopts tap water, the effective section dimension of a cast test piece in a standard die is 100mm multiplied by 100mm, the length of a steel bar is 200mm, the protruding length of the steel bars at two sides is 50mm, the length of the test piece is 100mm, the standard maintenance is carried out in a maintenance room for 28d after the cast molding, and the concrete test piece with different protective layer thicknesses poured is taken as an example to specifically explain the influence of the size change (adjustment and distance measurement) of a bayonet on the magnetic induction intensity:
the x-axis is established in the front-back direction, the y-axis is established in the left-right direction, and the z-axis is established in the up-down direction. And moving the to-be-tested part to the center of the sensor magnetic core bayonet, and defining the three-dimensional relative coordinate value (x, y, z) of the center of the magnetic core bayonet at the moment as (0,0, 0).
The slidable magnetic core moves along the x direction, the magnetic induction intensity value and the x coordinate value of the Hall sensor are recorded, the test data are shown in figure 4, and the test data show that the magnetic induction intensity monitoring value is greatly influenced when the thickness of the protective layer is changed and the slidable magnetic core is adjusted to measure the distance.
The embodiments described in this specification are merely exemplary of implementations of the inventive concepts, and are provided for illustrative purposes only. The scope of the present invention should not be construed as being limited to the particular forms set forth in the following description, but is to be accorded the widest scope consistent with the principles and novel features as contemplated by the present invention.
Claims (5)
1. The distance-measuring adjustable steel bar corrosion magnetic induction sensor is characterized by comprising a distance-measuring adjustable magnetic induction intensity monitoring unit and a data processing unit, wherein the distance-measuring adjustable magnetic induction intensity monitoring unit comprises a signal generator, a coil, a magnetic core system, a first Hall sensor and a second Hall sensor, the coil is uniformly wound on the magnetic core system, two ends of the coil are connected with a signal input end of the signal generator, the middle position of a to-be-tested piece clamped by a fixing unit corresponds to the middle position of a bayonet of a magnetic core, and the first Hall sensor and the second Hall sensor are symmetrically arranged by taking a central line of the bayonet as an axis; the magnetic core body system including fixed magnetic core, slidable magnetic core sheath and magnet, slidable magnetic core sheath and slidable magnetic core form an organic whole, slidable magnetic core sheath is fixed with slidable magnetic core and fixed magnetic core connection, by magnet hold slidable magnetic core and fixed magnetic core each other.
2. The steel bar corrosion magnetic induction sensor with adjustable distance measurement of claim 1, wherein the fixed magnetic core and the slidable magnetic core are made of silicon steel, and the slidable magnetic core sheath is made of plastic.
3. The steel bar corrosion magnetic induction sensor with adjustable distance measurement as claimed in claim 1 or 2, wherein the magnetic core body system comprises an insulating handle, the insulating handle is arranged at the long side end of the fixed magnetic core, and the insulating handle is a handle made of rubber insulating material.
4. The steel bar corrosion magnetic induction sensor with adjustable distance measurement of claim 1 or 2, wherein the slidable magnetic core sheath is provided with a prepared hole and a bolt, and the bolt is screwed in the prepared hole to fix the slidable magnetic core sheath and the slidable magnetic core.
5. The steel bar corrosion magnetic induction sensor with adjustable distance measurement of claim 1 or 2, wherein the fixed magnetic core and the slidable magnetic core are trapezoidal bayonets.
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| CN202122007788.7U CN216433861U (en) | 2021-08-25 | 2021-08-25 | Range finding adjustable reinforcing bar corrosion magnetic induction sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113720756A (en) * | 2021-08-25 | 2021-11-30 | 浙江工业大学 | Range finding adjustable reinforcing bar corrosion magnetic induction sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113720756A (en) * | 2021-08-25 | 2021-11-30 | 浙江工业大学 | Range finding adjustable reinforcing bar corrosion magnetic induction sensor |
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