CN211292716U - External steel bar corrosion in-situ nondestructive monitoring test device based on electromagnetic field principle - Google Patents
External steel bar corrosion in-situ nondestructive monitoring test device based on electromagnetic field principle Download PDFInfo
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Abstract
An external steel bar corrosion in-situ nondestructive monitoring test device based on an electromagnetic field principle comprises a sensor system and a three-dimensional accurate positioning and moving system; the sensor system comprises a magnetic induction intensity monitoring unit and a data processing unit, wherein the magnetic induction intensity monitoring unit comprises a magnetic core, a coil, a packaging shell, a Hall sensor and a signal generator; the data processing unit comprises a signal processor and a central processing unit, and the three-dimensional accurate positioning and moving system comprises a left-right moving and fixing unit, an up-down moving and fixing unit, a front-back moving and fixing unit and a clamping claw unit. The utility model realizes the accurate monitoring of the corrosion of the steel bar; the test piece is suitable for both mortar test pieces and concrete test pieces.
Description
Technical Field
The utility model relates to a reinforcing bar corrosion monitoring technology among the building engineering, in particular to external formula reinforcing bar corrosion normal position nondestructive test device based on electromagnetic field principle.
Background
The reinforced concrete structure combines the characteristics of tensile strength and compression strength of the reinforced steel bar, and has become the most widely applied structural form in the world due to the characteristics of low cost, wide material sources, convenience in construction and the like since the reinforced concrete structure is applied to the field of civil engineering in the middle of 19 th century. The damage caused by the failure of the durability of the concrete is huge for a long time and far exceeds the expectation of people, and the damage becomes a worldwide problem. The steel bar corrosion is the most serious in the cause of the durability damage of the concrete, and the method has attracted wide attention at home and abroad. A great deal of research is also made by the predecessors aiming at the research of the detection of the corrosion of the steel bar in the construction engineering.
At present, the monitoring method of the steel bar corrosion is divided into damage detection and nondestructive detection. The damage detection measurement result is more accurate, but need to carry out the broken type to reinforced concrete and take out the reinforcing bar, the harm that causes the concrete structure is irreversible, is just being not suitable for the reinforced concrete structure in service period. The nondestructive testing method is a hotspot of current research, and mainly comprises a half-cell potential method, an acoustic emission technology and a built-in monitoring technology. The half-cell potential method utilizes the potential change caused by the electrochemical reaction of the steel bar corrosion to determine the steel bar corrosion state, but the accuracy is lower, the probability of the steel bar corrosion can be only determined qualitatively, and no unified determination standard exists; the acoustic emission technology can only qualitatively judge the corrosion occurrence probability according to parameters such as accumulated impact number and the like, and can not quantitatively measure the corrosion rate of the steel bar; a steel bar corrosion monitoring method based on a magnetic field principle is disclosed in Chinese patent grant No. CN109374726A, wherein the grant date is 2019, 2 and 22 days, and the name is 'a steel bar corrosion nondestructive dynamic monitoring sensor and system in concrete based on a magnetic field'; the two patents provide a steel bar corrosion monitoring sensor applied to built-in concrete and used for monitoring the steel bar corrosion condition of the built-in concrete, but the built-in monitoring sensor can seriously influence the mechanical property of the reinforced concrete and the natural corrosion rule of the steel bar; and the sensor is arranged in the concrete and can only be used once, so that the cost is higher. The Chinese patent is entitled "monitoring equipment and method for steel bar corrosion behavior in concrete" with an authorization publication number CN108469514A, the publication date is 2018, 8 and 31, and the sensor related to the patent has the following defects: firstly, although the sensor can measure the corrosion condition of the steel bar, the sensor can only qualitatively judge the corrosion condition of the whole steel bar in the concrete and cannot judge the corrosion condition of a single steel bar, and the corrosion conditions of the steel bar in the concrete in actual engineering are different, so that the corrosion condition of the single steel bar needs to be measured; secondly, the human test results of the utility model prove that the influence of different positions of the steel bars on the response condition of the Hall sensor is far larger than the influence of corrosion of the steel bars, and the error is larger under the condition that the visible steel bars can not ensure the in-situ monitoring; thirdly, the Hall sensors are arranged in a single linear direction, and the method cannot effectively monitor the change rule of the position of the steel bar; fourthly, the actual concrete column has larger size, the whole reinforced concrete column needs to be effectively clamped by the test of the patent, and the required magnetic core bayonet is larger, and the increase of the bayonet can lead to the reduction of the detection sensitivity of the Hall sensor through the test result of the human test of the utility model; meanwhile, the steel bar corrosion monitoring system related to the three patents lacks an effective three-dimensional positioning and moving device, and can not realize steel bar in-situ corrosion monitoring, and the human tests of the utility model prove that the relative position movement of the steel bar and a sensor bayonet can cause the change of magnetic induction intensity, and the monitoring of the steel bar corrosion also takes the change value of the magnetic induction intensity as a basis, so that the error is larger under the condition that the steel bar can not ensure the in-situ monitoring; in summary, the measurement results of the sensors in the above three patents cannot reflect the real corrosion situation of the steel bar, and accurate and reliable data cannot be obtained to predict the corrosion degree of the steel bar under different situations.
In the actual building engineering, an external in-situ monitoring test device and a test method for accurately measuring the corrosion rate of the steel bars still do not exist.
Therefore, the external nondestructive dynamic steel bar corrosion monitoring test device and the test method which have the advantages of clear principle, simple and convenient method, high determination speed, repeated use, strong engineering applicability, good stability and the like are found, and the improvement has important significance for continuously and deeply evaluating and predicting the steel bar corrosion degree.
Disclosure of Invention
In order to overcome the not enough of current building engineering reinforcing bar corrosion nondestructive monitoring technique, the utility model provides a stability is high, easy and simple to handle, can realize external reinforcing bar corrosion normal position monitoring, especially relates to the reinforcing bar corrosion normal position monitoring technique of using based on the electromagnetic field principle: externally arranged outside the reinforced concrete structure; the bayonet of the magnetic core is designed into a trapezoidal bayonet, so that the reinforced concrete square column can be effectively clamped, and the corrosion condition of a single detection reinforcing steel bar at the corner of the reinforced concrete square column can be effectively detected; the electromagnetic field intensity is changed by controlling the current of the coil and the number of turns of the coil, so that the air field magnetic leakage influence caused by the change of the bayonet distance of the magnetic core is reduced, and the detection precision of the magnetic induction intensity of the Hall sensor is improved so as to adapt to reinforced concrete square columns with different sizes; the position of the steel bar is accurately detected through the symmetrical arrangement of the Hall sensors; the three-dimensional accurate positioning and moving of the reinforcing steel bar can be realized.
In order to solve the technical problem, the utility model provides a following technical scheme:
an external steel bar corrosion in-situ nondestructive monitoring test device based on an electromagnetic field principle comprises a sensor system and a three-dimensional accurate positioning and moving system.
The sensor system comprises a magnetic induction intensity detection unit and a data processing unit; the magnetic induction intensity detection unit comprises a signal generator, a coil, a magnetic core, a packaging shell, a first Hall sensor and a second Hall sensor, wherein the coil is uniformly wound on the magnetic core, and two ends of the coil are electrically connected with a signal input end of the signal generator; the middle position of the reinforced concrete test piece clamped by the fixing unit corresponds to the middle position of the bayonet of the magnetic core; the packaging shell comprises a first Hall sensor placing groove, a second Hall sensor placing groove and a sealing cover; the first Hall sensor and the second Hall sensor are symmetrically arranged by taking a bayonet center line as an axis and are respectively arranged in a first Hall sensor placing groove and a second Hall sensor placing groove of the packaging shell; the data processing unit comprises a signal collector, a signal processor and a central controller, wherein the input end of the signal collector is electrically connected with the signal output ends of the first Hall sensor and the second Hall sensor, the signal output end of the signal generator and the output end of the signal collector are respectively electrically connected with the signal input end of the signal processor, and the signal output end of the signal processor is electrically connected with a port of the central controller.
The three-dimensional accurate positioning and moving system comprises a left-right moving and fixing unit, an up-down moving and fixing unit, a front-back moving and fixing unit and a clamping claw unit; the left-right moving and fixing unit comprises a left-right precession handle, a left-right precession bearing, an I-shaped sliding block, a bottom base and an upper polish rod and a lower polish rod; the screw-in handle is provided with a threaded hole, and the threaded hole is in threaded connection with the left screw-in bearing and the right screw-in bearing; the bottom base is provided with a dial scale for a tester to observe the left-right movement length of the reinforced concrete test piece, the bottom base is provided with an inverted T-shaped hole for an I-shaped sliding block to slide left and right in the bottom base, and the I-shaped sliding block is fixedly connected with a left-right precession bearing, an upper polish rod and a lower polish rod; the up-down moving and fixing unit comprises a first arc-shaped fixing clamp, an upper polish rod, a lower polish rod, a first screw rod and a first locking nut; the left side and the right side of the first arc-shaped fixing clamp are respectively provided with a fixing surface and a threaded hole, the first screw rod is connected with the first locking nut bolt through the threaded hole, and the fixing surface of the first arc-shaped fixing clamp and the first screw rod are in close contact with the left surface and the right surface of the upper polish rod and the lower polish rod; the front-back moving and fixing unit comprises a second arc-shaped fixing clamp, a second screw rod, a second locking nut and a front polish rod and a rear polish rod; the right side and the left side of the second arc-shaped fixing clamp are respectively provided with a fixing surface and a threaded hole, the second screw rod and the second locking nut are connected through the threaded hole by bolts, and the fixing surface of the second arc-shaped clamp and the second screw rod are in close contact with the left surface and the right surface of the front polished rod and the rear polished rod; the clamping jaw unit comprises a third screw rod, a third locking nut, a first dome screw rod, a second dome screw rod, a fourth locking nut, a fifth locking nut, a square rotating block, a jaw shell and a jaw accessory; the claw fittings comprise a left claw, a right claw, a rotary key and a connecting block, and the left claw and the right claw are fixedly connected with the claw shell.
Further, the first Hall sensor and the second Hall sensor are symmetrically arranged.
Still further, the magnetic core is a trapezoidal bayonet.
Furthermore, the signal generator can stably control the current of the coil.
The magnetic core is made of silicon steel.
The packaging shell is made of plastic materials.
The signal collector and the signal generator are respectively provided with a first indicator light and a second indicator light of a circuit, and the first indicator light and the second indicator light respectively prompt whether the signal collector and the signal generator work normally or not.
The Hall sensors can be symmetrically arranged in one or more pairs according to the precision requirement and the actual engineering requirement.
The bottom base is provided with a dial for a tester to visually and accurately measure the coordinate value of the left and right directions of the reinforced concrete test piece.
The upper and lower polished rods are provided with scales for testing personnel to visually and accurately measure coordinate values of the reinforced concrete test piece in the up-down direction.
The front and rear polished rods are provided with scales for testing personnel to visually and accurately measure the coordinate values of the reinforced concrete test piece in the front and rear directions.
The claw shell is provided with a left through hole and a right through hole, wherein the left part and the right part of the claw shell are connected with a fifth locking nut through a second round top screw rod, and the telescopic length of the clamping claw is controlled by controlling the screwing depth of the fifth locking nut.
And an arc-shaped space is reserved on the left side of the connecting block so that the left part of the claw shell and the rotary key can move when stretching.
And threaded through holes are formed on the left and the right of the I-shaped sliding block.
The bottom base is made of pig iron or other high-density materials, so that the whole device is prevented from inclining forwards due to the fact that a large reinforced concrete test piece is too heavy.
The connecting block is fixedly connected with the claw shell.
And the rear part of the connecting block is provided with a threaded hole and is connected with the square rotating block, the front-back moving and fixing unit through a third screw and a third locking nut.
The claw shell and the rotary key are provided with upper and lower thread through holes, and the rotary key and the claw shell are connected through a first round top screw rod and a fourth locking nut bolt.
The left part of the claw shell is fixedly connected with the rotary key.
As an improvement, the utility model discloses in magnetic core bayonet socket of magnetic induction detection unit is trapezoidal shape, can firmly block in the edge of reinforced concrete square column, accomplishes the monitoring to single detection reinforcing bar corrosion, and can block not unidimensional reinforced concrete column according to the embedding degree of depth or change magnetic core bayonet socket distance.
As an improvement, the utility model provides a magnetic core of magnetic induction detecting element and the even strong electromagnetic field that even wire-wound coil generated depend on coil current and coil number of turns, can not be because of time variation demagnetization, the testing result is accurate.
As an improvement, in the utility model discloses in the electro-magnet accessible control coil electric current that magnetic core, even wire-wound coil and signal generator of magnetic induction detecting element constitute and the coil number of turns change the electromagnetic field intensity, through the utility model discloses the experimental test result of people proves that it can effectively reduce the influence of magnetic core bayonet socket distance change brought air field magnetic leakage, improves sensor magnetic induction and detects the precision.
As an improvement, the utility model provides a magnetic induction intensity detecting element arrange the reinforced concrete column in outward to realize reuse and dynamic monitoring.
As an improvement, the utility model discloses in first hall sensor and the second hall sensor of magnetic induction detecting element use the bayonet socket central line to arrange as the axis symmetry, but through utility model people's test result prove the position of accurate detection reinforcing bar.
As an improvement, data processing unit, the usable existing mature technology of its relevant control circuit realizes, thereby mainly includes control coil's operating current, survey first hall sensor and second hall sensor's the magnetic induction strength value calculation and obtain the corrosion rate. The magnetic induction intensity measuring system and the data processing system finish data storage, post-processing and real-time display through the signal processor and the central controller.
As an improvement, the effective clamping area diameter of the clamping claw unit is a circular section of 6mm-25mm, and reinforcing steel bars with different diameters can be firmly clamped.
As an improvement, bottom base, upper and lower polished rod and front and back polished rod be equipped with the scale respectively to control, upper and lower and back-and-forth movement length value about, accurately record the reinforced concrete test piece for the test personnel directly perceived, thereby establish three-dimensional coordinate value, so that reinforced concrete test piece normal position monitoring location.
As an improvement, connecting block left side headspace to it is rotatory when supplying claw shell left part and swivelling key to stretch out and draw back, claw shell left part and swivelling key can be rotatory simultaneously when the atress, make claw shell left part flexible, play the flexible effect of clamping jaw.
As an improvement, rotatory piece surface smooth, the rotatory piece that rotatable threaded rod connects is rotatory in order to drive clamping jaw unit and reinforced concrete test piece before third lock nut locking to guarantee in reinforced concrete test piece edge embedding sensor bayonet.
As an improvement, control precession bearing accessible control the precession handle carries out precession degree of depth control, makes things convenient for the experimenter to operate.
As an improvement, arc fixation clamp both sides be equipped with stationary plane and screw hole respectively, stationary plane and first screw rod, second screw rod pass through screw hole and upper and lower polished rod and front and back polished rod in close contact with, make arc fixation clamp and upper and lower polished rod and front and back polished rod fixed.
As an improvement, first screw rod and second screw rod back of screwing out, the arc fixation clamp can reciprocate along upper and lower polished rod, the polished rod can be along first arc fixation clamp back-and-forth movement around.
As an improvement, the arc fixation clamp by first arc fixation clamp and second arc fixation clamp mutually perpendicular rigid coupling, the headspace is in order to supply first arc fixation clamp, second arc fixation clamp and front and back polished rod to remove.
The utility model discloses a theory of operation: the Hall sensor detects the magnetic induction intensity of the magnetic induction intensity detection unit and sends the magnetic induction intensity to the signal processor, and the current of the magnetic induction intensity detection unit is controlled by the signal generator; the signal processor collects data of the signal generator and the signal collector according to the set frequency, calculates and analyzes the data, stores the collected data and the calculation result in the central controller in real time, and displays the analysis and calculation result in real time through the display screen. When the device is used specifically, after the left-right moving and fixing unit, the up-down moving and fixing unit, the front-back moving and fixing unit and the clamping claw unit are installed, a fifth locking nut is screwed in, a space is reserved on the left side of the connecting block, so that the left part of the claw shell and the rotary key can rotate when being stretched, the left part of the claw shell and the rotary key can simultaneously rotate when the fifth locking nut is screwed in, the left part of the claw shell is stretched, and the stretching effect of the clamping claw is achieved, so that a reinforced concrete test piece is clamped; the first screw rod is screwed out, and the arc-shaped fixing clamp can move up and down along the upper and lower polish rods, so that the reinforced concrete test piece can move up and down; the second screw rod is screwed out, and the front and rear polish rods can move back and forth along the first arc-shaped fixing clamp, so that the reinforced concrete test piece can move back and forth; the bottom base is provided with an inverted T-shaped hole for the I-shaped sliding block to slide left and right in the bottom base, the I-shaped sliding block is in threaded connection with the left and right precession bearings, and the left and right precession bearings are controlled by operating the left and right precession handles to drive the I-shaped sliding block to move left and right, so that the reinforced concrete test piece moves left and right; the bottom base, the upper and lower polish rods and the front and rear polish rods are respectively provided with scales so as to allow a tester to visually and accurately measure three-dimensional coordinate values of the reinforced concrete test piece after left and right, up and down and front and rear movement, and realize in-situ corrosion monitoring of the reinforced concrete test piece.
The utility model has the advantages that: the utility model discloses based on the nondestructive test method, utilize the electromagnetic induction technique to realize reinforcing bar corrosion nondestructive test to calculate the corrosion rate that obtains the reinforcing bar according to theoretical formula. The limit of the test stability, accuracy and use times of the traditional test method is broken through, and the test of the corrosion rate of the steel bar of the reinforced concrete test piece is realized; 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 device can accurately position the reinforced concrete test piece in three dimensions, and realize in-situ corrosion monitoring; the test object can be suitable for reinforcing steel bars and reinforced concrete square columns with different sizes, has the advantages of clear principle, simple and convenient method, high measuring speed, accurate positioning, repeated use, good stability and the like, and can make up the defect of the prior method and equipment for measuring the corrosion rate of the reinforcing steel bars.
Drawings
Fig. 1 is a schematic view of the structure of the device of the present invention.
Fig. 2 is a front view of the clamping jaw unit of the present invention.
Fig. 3 is a top view of the clamping jaw unit of the present invention.
Fig. 4 is a front view of the arc-shaped fixing clip of the present invention.
Fig. 5 is a right side view of the arc-shaped fixing clip of the present invention.
Fig. 6 is a top view of the arc-shaped fixing clip of the present invention.
Fig. 7 is a top view of the left and right moving and fixing units of the present invention.
Fig. 8 is a right side view of the left and right moving and fixing unit of the present invention.
Fig. 9 is a front view of the left-right moving and fixing unit of the present invention.
Fig. 10 is a three-dimensional schematic view of the connecting block of the clamping jaw unit of the present invention.
Fig. 11 is a top view of the connection block of the clamping jaw unit of the present invention.
Fig. 12 is a front view of the rotary key of the clamping jaw unit of the present invention.
Fig. 13 is a right side view of the rotary key of the clamping jaw unit of the present invention.
Fig. 14 is a plan view of the rotary key of the clamping jaw unit of the present invention.
Fig. 15 is a schematic structural view of the package housing of the present invention before being covered.
Fig. 16 is a top view of the closure of the present invention.
Fig. 17 shows the magnetic core bayonet increases the sensor detection result.
Fig. 18 shows the detection result of the sensor after the magnetic field amplification of the present invention.
Fig. 19 shows the test results of the position detection in the x and y directions of the hall sensor.
Fig. 20 shows the z-direction position detection test result of the hall sensor of the present invention.
Fig. 21 is the utility model discloses hall sensor reinforcing bar corrosion test result.
Reference numbers in the figures: 1. a left and right screw-in handle; 2. a left and right precession bearing; 3. a bottom base; 4. an I-shaped slider; 5. an upper polish rod and a lower polish rod; 6-1, a first locking nut; 6-2, a second lock nut; 6-3, a third lock nut; 6-4, a fourth lock nut; 6-5, a fifth lock nut; 7. an arc-shaped fixing clip; 7-1, a first arc-shaped fixing clamp; 7-2, a second arc-shaped fixing clamp; 8. front and rear polished rods; 9-1, a first screw; 9-2, a second screw; 9-3 third screw; 10. rotating the block; 11-1, a first dome screw; 11-2, a second dome screw, 12, a claw shell; 13. a jaw fitting; 13-1, left paw; 13-2, right claw; 13-3, a rotating key; 13-4, connecting blocks; 14. a coil; 15. a magnetic core; 16-1, a first hall sensor; 16-2, a second hall sensor; 17. a signal generator; 18. a signal collector; 19. a data processor; 20. a central controller; 21-1, a first indicator light; 21-2, a second indicator light; 22. a package housing; 22-1, a first Hall sensor placing groove; 22-2, a second Hall sensor placing groove; 22-3 and sealing the cover.
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 are used to indicate the position or positional relationship based on the position or positional relationship shown in the drawings, which is only for convenience of describing the present invention but does not require the present invention to be constructed and operated in a specific position, and thus, should not be construed as limiting the present invention.
Referring to fig. 1 to 21, an external steel bar corrosion in-situ nondestructive monitoring test device based on an electromagnetic field principle comprises a sensor system and a three-dimensional precise positioning and moving system;
the sensor system comprises a magnetic induction intensity detection unit and a data processing unit; the magnetic induction intensity detection unit comprises a signal generator 17, a coil 14, a magnetic core 15, a packaging shell 22, a first Hall sensor 16-1 and a second Hall sensor 16-2, wherein the coil 14 is uniformly wound on the magnetic core 15, and two ends of the coil 14 are electrically connected with a signal input end of the signal generator 17; the middle position of the reinforced concrete test piece corresponds to the middle position of the bayonet of the magnetic core 15; the packaging shell 22 comprises a first Hall sensor placing groove 22-1, a second Hall sensor placing groove 22-2 and a sealing cover 22-3; the first Hall sensor 16-1 and the second Hall sensor 16-2 are symmetrically arranged by taking a bayonet central line as an axis, and are respectively arranged in a first Hall sensor placing groove 22-1 and a second Hall sensor placing groove 22-2 of the packaging shell 22; the data processing unit comprises a signal collector 18, a signal processor 19 and a central controller 20, wherein the input end of the signal collector 18 is electrically connected with the signal output ends of the first hall sensor 16-1 and the second hall sensor 16-2, the signal output end of the signal generator 17 and the output end of the signal collector 18 are respectively electrically connected with the signal input end of the signal processor 19, and the signal output end of the signal processor 19 is electrically connected with a port of the central controller 20;
the three-dimensional accurate positioning and moving system comprises a left-right moving and fixing unit, an up-down moving and fixing unit, a front-back moving and fixing unit and a clamping claw unit; the left-right moving and fixing unit comprises a left-right precession handle 1, a left-right precession bearing 2, an I-shaped sliding block 4, a bottom base 3 and an upper polish rod and a lower polish rod 5; the screw-in handle is provided with a threaded hole which is in threaded connection with the left and right screw-in bearings 2; the bottom base 3 is provided with a dial scale for a tester to observe the left-right movement length of the reinforced concrete test piece, the bottom base is provided with an inverted T-shaped hole for an I-shaped sliding block 4 to slide left and right in the bottom base, and the I-shaped sliding block 4 is fixedly connected with a left-right precession bearing 2 and an upper polish rod 5 and a lower polish rod 5; the up-down moving and fixing unit comprises a first arc-shaped fixing clamp 7-1, an upper polish rod 5, a lower polish rod 5, a first screw rod 9-1 and a first locking nut 6-1; the left side and the right side of the first arc-shaped fixing clamp 7-1 are respectively provided with a fixing surface and a threaded hole, the first screw 9-1 is in bolt connection with the first locking nut 6-1 through the threaded hole, and the fixing surface of the first arc-shaped fixing clamp 7-1 and the first screw 9-1 are in close contact with the left surface and the right surface of the upper polish rod 5 and the lower polish rod 5; the back-and-forth moving and fixing unit comprises a second arc-shaped fixing clamp 7-2, a second screw 9-2, a second locking nut 6-2 and a front and a rear polished rods 8; the right side and the left side of the second arc-shaped fixing clamp 7-2 are respectively provided with a fixing surface and a threaded hole, the second screw 9-2 and the second locking nut 6-2 are connected through the threaded hole by bolts, and the fixing surface of the second arc-shaped clamp 7-2 and the second screw 9-2 are in close contact with the left surface and the right surface of the front polished rod 8 and the rear polished rod 8; the clamping jaw unit comprises a third screw rod 9-3, a third locking nut 6-3, a first dome screw rod 11-1, a second dome screw rod 11-2, a fourth locking nut 6-4, a fifth locking nut 6-5, a square rotating block 10, a jaw shell 12 and a jaw accessory 13; the claw fittings comprise a left claw 13-1, a right claw 13-2, a rotary key 13-3 and a connecting block 13-4, and the left claw 13-1 and the right claw 13-2 are fixedly connected with a claw shell 12.
Further, the first Hall sensor 16-1 and the second Hall sensor 16-2 are symmetrically arranged.
Still further, the magnetic core 15 is a trapezoidal bayonet.
Furthermore, the signal generator 17 can stably control the current magnitude of the coil 14.
The magnetic core 15 is made of silicon steel.
The package housing 22 is made of plastic.
The signal collector and the signal generator are respectively provided with a first indicator light 21-1 and a second indicator light 21-2 of a circuit, and the first indicator light 21-1 and the second indicator light 21-2 respectively prompt whether the signal collector 18 and the signal generator 17 work normally or not.
The Hall sensors can be symmetrically arranged in one or more pairs according to the precision requirement and the actual engineering requirement.
The bottom base 3 is provided with a dial for a tester to visually and accurately measure the coordinate value of the left and right directions of the reinforced concrete test piece.
The upper and lower polish rods 5 are provided with scales for the tester to visually and accurately measure the coordinate values of the reinforced concrete test piece in the up-down direction.
The front and rear polish rods 8 are provided with scales for testing personnel to visually and accurately measure the coordinate values of the reinforced concrete test piece in the front and rear directions.
The claw shell 12 is provided with a left through hole and a right through hole, wherein the left part and the right part of the claw shell 12 are connected through a second dome screw rod 11-2 and a fifth locking nut 6-5 through bolts, and the telescopic length of the clamping claw is controlled by controlling the screwing depth of the fifth locking nut 6-5.
As an improvement, the effective clamping area diameter of the clamping claw unit is a circular section of 6mm-25mm, and reinforcing steel bars with different diameters can be firmly clamped.
An arc-shaped space is reserved on the left side of the connecting block 13-4, so that the left part of the claw shell 12 and the rotary key 13-3 can move when being stretched.
The left and right sides of the I-shaped sliding block 4 are provided with threaded through holes.
The bottom base 3 is made of pig iron or other high-density materials, so that the whole device is prevented from inclining forwards due to the fact that a large reinforced concrete test piece is too heavy.
The connecting block 13-4 is fixedly connected with the claw shell 12.
The rear part of the connecting block 13-4 is provided with a threaded hole which is connected with the square rotating block 10 and the front-back movement and fixing unit through a third screw 9-3 and a third locking nut 6-3.
The claw shell 12 and the rotary key 13-3 are provided with upper and lower thread through holes, and the rotary key 13-3 and the claw shell 12 are connected through a first dome screw 11-1 and a fourth lock nut 6-4 by bolts.
The left part of the claw shell 12 is fixedly connected with a rotary key 13-3.
As an improvement, the utility model discloses in 15 bayonets of magnetic core of magnetic induction detecting element are trapezoidal shape, can firmly block in the edge of reinforced concrete square column, accomplish the monitoring of single detection reinforcing bar corrosion, and can block not unidimensional reinforced concrete column according to the embedding degree of depth or change magnetic core bayonet socket distance.
As an improvement, the utility model provides a magnetic core 15 of magnetic induction detecting element and the even strong electromagnetic field that even wire-wound coil 14 generated depend on coil 14 electric current and the coil number of turns, can not be because of time variation degaussing, the testing result is accurate.
As an improvement, in the utility model discloses in the electro-magnet accessible control coil 14 electric current and the 14 turns of coil of electro-magnet accessible control coil that magnetic core 15, even wire-wound coil 14 and signal generator 17 of magnetic induction detection unit constitute change magnetic field intensity, through the utility model discloses the experimental test result of people proves that it can effectively reduce the influence of magnetic core 15 bayonet socket distance changes the air domain magnetic leakage that brings, improves sensor magnetic induction and detects the precision.
As an improvement, the effective clamping area diameter of the clamping claw unit is a circular section of 6mm-25mm, and reinforcing steel bars with different diameters can be firmly clamped.
As an improvement, bottom base 3, upper and lower polished rod 5 and front and back polished rod 8 be equipped with the scale respectively to control, upper and lower and back-and-forth movement length value about, accurately record the reinforced concrete test piece for the test personnel directly perceived, thereby establish three-dimensional coordinate value, so that the reinforced concrete test piece normal position monitoring location.
As an improvement, the left side of the connecting block 13-4 of the utility model is reserved for the left part of the claw shell 12 and the rotary key 13-3 to rotate when stretching out and drawing back, and the left part of the claw shell 12 and the rotary key 13-3 can rotate simultaneously when being stressed, so that the left part of the claw shell 12 stretches out and draws back, and the effect of clamping the claw to stretch out and draw back is achieved.
As an improvement, rotatory piece 10 smooth surface, the rotatory piece 10 of rotatable threaded rod connection is rotatory in order to drive clamping jaw unit and reinforced concrete test piece before third lock nut 6-3 locks, ensures that reinforced concrete test piece edge imbeds in the sensor bayonet.
As an improvement, control precession bearing 2 accessible about precession handle 1 carries out precession degree of depth control, makes things convenient for the experimenter to operate.
As an improvement, the two sides of the arc-shaped fixing clamp 7 are respectively provided with a fixing surface and a threaded hole, and the fixing surface, the first screw 9-1 and the second screw 9-2 are in close contact with the upper and lower polish rods 5 and the front and rear polish rods 8 through the threaded holes, so that the arc-shaped fixing clamp 7 is fixed with the upper and lower polish rods 5 and the front and rear polish rods 8.
As an improvement, after the first screw rod 9-1 and the second screw rod 9-2 are screwed out, the arc-shaped fixing clamp 7 can move up and down along the upper and lower polish rods 5, and the front and rear polish rods 8 can move back and forth along the first arc-shaped fixing clamp 7-1.
As an improvement, the arc-shaped fixing clamp of the utility model is fixedly connected with a first arc-shaped fixing clamp 7-1 and a second arc-shaped fixing clamp 7-2 in a mutually perpendicular way, and a space is reserved for the first arc-shaped fixing clamp 7-1, the second arc-shaped fixing clamp 7-2 and the front and back polished rods to move 8.
The testing method of the external steel bar corrosion in-situ nondestructive monitoring testing device based on the electromagnetic field principle takes an HPB300 smooth round steel bar with the diameter of 16mm as an example, and comprises the following steps:
firstly, preparing a reinforced concrete test piece before testing, wherein the process is as follows:
1.1 taking HPB300 smooth round steel bars with the length of 20cm and the diameter of 16mm as calibration steel bars and steel bars to be measured, weighing the mass m of the steel bars to be measured1I，m2I，m3I，m4I，m5I，m6I，m7IAnd calibrating the steel bar mass m0And recording;
1.2 coating epoxy resin at 5cm positions at two ends of the calibration steel bar and the steel bar to be detected in a mold and pouring for molding, wherein the concrete comprises the following raw materials: the cement is P.I 525 grade Portland cement, river sand with fineness modulus of 2.6 is adopted as the sand, continuous graded broken stone (the maximum grain diameter is 25mm) is adopted as coarse aggregate, tap water is adopted as water, the effective section size 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 on 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 is carried out, the calibrated reinforced concrete test piece and the reinforced concrete test piece to be tested after the cast molding are soaked in a standard salt concentration solution until the salt is saturated, and the concentration of the standard sodium chloride solution is 0.1-2 mol/L;
second, preparation before measurement, as follows:
2.1 uniformly and equidirectionally winding an enameled copper wire on the magnetic core 15 to form a coil 14, installing a first Hall sensor 16-1 and a second Hall sensor 16-2 on a first Hall sensor placing groove 22-1 and a second Hall sensor placing groove 22-2 of a packaging shell 22, then electrifying to form a uniform strong electromagnetic field, and covering a sealing cover 22-3 for packaging.
2.2 after installing the left-right moving and fixing unit, the up-down moving and fixing unit, the front-back moving and fixing unit and the clamping jaw unit, screwing in a fifth locking nut 6-5, reserving a space on the left side of a connecting block 13-4 to allow the left part of the jaw shell 12 and the rotary key 13-3 to rotate when being stretched, and allowing the left part of the jaw shell 12 and the rotary key 13-3 to simultaneously rotate when the fifth locking nut 6-5 is screwed in, so that the left part of the jaw shell 12 is stretched, and the effect of stretching the clamping jaw is achieved, and the reinforced concrete test piece is clamped.
2.3, the first screw rod 9-1 is screwed out, and the arc-shaped fixing clamp 7 can move up and down along the upper polish rod 5 and the lower polish rod 5, so that the reinforced concrete test piece moves up and down; the second screw rod 9-2 is screwed out, and the front and rear polish rods 8 can move back and forth along the first arc-shaped fixing clamp 7-1, so that the reinforced concrete test piece can move back and forth; the bottom base 3 is provided with an inverted T-shaped hole for the I-shaped sliding block 4 to slide left and right in the bottom base 3, the I-shaped sliding block 4 is in threaded connection with the left and right precession bearings 2, and the left and right precession bearings 2 are controlled by operating the left and right precession handles 1 to drive the I-shaped sliding block 4 to move left and right, so that the reinforced concrete test piece moves left and right; the reinforced concrete test piece is moved to the center of the bayonet 15 of the magnetic core of the sensor through left-right movement, up-down movement and front-back movement. 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. The bottom base 3, the upper and lower polish rods 5 and the front and rear polish rods 8 are respectively provided with scales for testing personnel to visually and accurately measure three-dimensional coordinate values (x, y, z) of the reinforced concrete test piece to be (30,41,20), and the x, y and z coordinates are kept unchanged when the replacement test piece is taken down in the later test, so that in-situ corrosion monitoring of the reinforced concrete test piece is realized.
2.4 the central controller 9 controls the collection frequency of the signal collector 6 and the current of the signal generator 7, and the magnetic field is electrified and tested, so that the magnetic induction intensity gauss values of the first Hall sensor 1-1 and the second Hall sensor 1-2 are ensured to be the same.
Thirdly, a calibration test is carried out, and the process is as follows:
3.1 recording mass m1I，m2I，m3I，m4I，m5I，m6I，m7ICorresponding magnetic induction intensity data B of calibration reinforcing steel bar before corrosion of reinforced concrete test piece1I，B2I，B3I，B4I，B5I，B6I，B7I；
3.2 simulation experiment of reinforcing steel bar corrosion is realized in a mode of current-accelerated corrosion, the current density is controlled to be the same as the electrifying time, and the mass is m1I，m2I，m3I，m4I，m5I，m6I，m7IElectrifying the corresponding reinforced concrete test pieces for 1 day, 2 days, 3 days, 4 days, 5 days, 6 days and 7 days respectively;
3.3 recording the magnetic induction intensity data B of the calibration steel bar after the reinforced concrete test piece is corroded1II，B2II，B3II，B4II，B5II，B6II，B7IIAnd steel bar quality data m1II，m2II，m3II，m4II，m5II，m6II，m7II；
3.4 respectively calculating the mass change rate of the calibrated steel bars △ m1，△m2，△m3，△m4，△m5，△m6，△m7The calculation formulas are respectively formulas (1) to (7);
3.5) respectively calculating and calibrating the variation rate △ B of the magnetic induction intensity of the reinforcing steel bars1，△B2，△B3，△B4，△B5，△B6，△B7The calculation formulas are respectively the formulas (8) to (14)
3.6, carrying out linear fitting on the relationship between the change rate of the steel bar mass and the change rate of the magnetic induction intensity of the Hall sensor to obtain a linear relationship coefficient alpha;
step four, measuring the test, the process is as follows:
4.1 recording the magnetic induction intensity B before the piece to be tested is rusted0I；
4.2 placing the reinforced concrete to be tested in an environment which is easy to cause the reinforcing steel bars to be corroded so as to promote the reinforcing steel bars to be corroded;
4.3 the corroded test piece to be tested is put back to the original position, and the magnetic induction intensity B after the steel bar is corroded is recorded0II；
4.4 Corrosion Rate p of Steel barsIIThe calculation formula is formula (15)
PII＝α(B0II-B0I) (15)。
In this embodiment, the reinforcing bar diameter is 16mm length and is 20 cm's HPB300 plain steel muscle, and the raw 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 mould 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 in-situ monitoring of the reinforced concrete test piece is specifically explained by taking the cast reinforced concrete test piece as an example:
after the left-right moving and fixing unit, the up-down moving and fixing unit, the front-back moving and fixing unit and the clamping jaw unit are installed, a fifth locking nut 6-5 is screwed in, a space is reserved on the left side of the connecting block 13-4 to allow the left part of the jaw shell 12 and the rotary key 13-3 to rotate when the jaw shell is stretched, the left part of the jaw shell 12 and the rotary key 13-3 can simultaneously rotate when the fifth locking nut 6-5 is screwed in, so that the left part of the jaw shell 12 stretches out and draws back, and the effect of stretching out and drawing back of the clamping jaw is achieved, and therefore the reinforced concrete.
The first screw rod 9-1 is screwed out, and the arc-shaped fixing clamp 7 can move up and down along the upper polish rod 5 and the lower polish rod 5, so that the reinforced concrete test piece can move up and down; the second screw rod 9-2 is screwed out, and the front and rear polish rods 8 can move back and forth along the first arc-shaped fixing clamp 7-1, so that the reinforced concrete test piece can move back and forth; the bottom base 3 is provided with an inverted T-shaped hole for the I-shaped sliding block 4 to slide left and right in the bottom base 3, the I-shaped sliding block 4 is in threaded connection with the left and right precession bearings 2, and the left and right precession bearings 2 are controlled by operating the left and right precession handles 1 to drive the I-shaped sliding block 4 to move left and right, so that the reinforced concrete test piece moves left and right; and moving the reinforced concrete test piece to the center of the bayonet of the sensor magnetic core through left-right movement, up-down movement and front-back movement. 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. The bottom base 3, the upper and lower polish rods 5 and the front and rear polish rods 8 are respectively provided with scales for testing personnel to visually and accurately measure three-dimensional coordinate values (x, y, z) of the reinforced concrete test piece to be (30,41,20), and the x, y and z coordinates are kept unchanged when the replacement test piece is taken down in the later test, so that in-situ corrosion monitoring of the reinforced concrete test piece is realized.
Example 3, a HPB300 plain round bar with a bar diameter of 16mm and a length of 20cm, the concrete raw materials were: 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 influence of the position change of the steel bar on the magnetic induction intensity by taking the cast reinforced concrete test piece as an example is specifically explained:
after the left-right moving and fixing unit, the up-down moving and fixing unit, the front-back moving and fixing unit and the clamping jaw unit are installed, a fifth locking nut 6-5 is screwed in, a space is reserved on the left side of the connecting block 13-4 to allow the left part of the jaw shell 12 and the rotary key 13-3 to rotate when the jaw shell is stretched, the left part of the jaw shell 12 and the rotary key 13-3 can simultaneously rotate when the fifth locking nut 6-5 is screwed in, so that the left part of the jaw shell 12 stretches out and draws back, and the effect of stretching out and drawing back of the clamping jaw is achieved, and therefore the reinforced concrete.
The first screw rod 9-1 is screwed out, and the arc-shaped fixing clamp 7 can move up and down along the upper polish rod 5 and the lower polish rod 5, so that the reinforced concrete test piece can move up and down; the second screw rod 9-2 is screwed out, and the front and rear polish rods 8 can move back and forth along the first arc-shaped fixing clamp 7-1, so that the reinforced concrete test piece can move back and forth; the bottom base 3 is provided with an inverted T-shaped hole for the I-shaped sliding block 4 to slide left and right in the bottom base 3, the I-shaped sliding block 4 is in threaded connection with the left and right precession bearings 2, and the left and right precession bearings 2 are controlled by operating the left and right precession handles 1 to drive the I-shaped sliding block 4 to move left and right, so that the reinforced concrete test piece moves left and right; and moving the reinforced concrete test piece to the center of the bayonet of the sensor magnetic core through left-right movement, up-down movement and front-back movement. 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. The bottom base 3, the upper and lower polish rods 5 and the front and rear polish rods 8 are respectively provided with scales for a tester to visually and accurately measure three-dimensional absolute coordinate values (x, y, z) of the reinforced concrete test piece to be (30,41,20), and for convenience of explanation, the three-dimensional relative coordinate values (x, y, z) of the center of the magnetic core bayonet at the moment are defined to be (0,0, 0).
The first screw rod 9-1 is screwed out, the arc-shaped fixing clamp 7 can move up and down along the upper polish rod 5 and the lower polish rod 5, so that the reinforced concrete test piece moves along the z direction, the magnetic induction intensity value and the z coordinate value of the Hall sensor are recorded, the test data are shown in figure 20, the magnetic induction intensity monitoring value cannot be changed when the effective length of the steel bar in the clamping opening area is not changed according to the test data, and the magnetic induction intensity monitoring value can be remarkably reduced when the moving distance of the steel bar in the z direction is increased to the effective length of the steel bar in the clamping opening area.
The second screw rod 9-2 is screwed out, and the front and rear polish rods 8 can move back and forth along the first arc-shaped fixing clamp 7-1, so that the reinforced concrete test piece moves along the y direction; the bottom base 3 is provided with an inverted T-shaped hole for the I-shaped sliding block 4 to slide left and right in the bottom base 3, the I-shaped sliding block 4 is in threaded connection with the left and right precession bearings 2, the left and right precession bearings 2 are controlled by operating the left and right precession handles 1 to drive the I-shaped sliding block 4 to move left and right, so that the reinforced concrete test piece moves along the x direction, the magnetic induction intensity value, the x coordinate value and the y coordinate value of the Hall sensor are recorded, the test data are shown in figure 19, and the magnetic induction intensity monitoring value is greatly influenced by the test data when the steel bar moves along the x and y directions.
When specifically realizing, the utility model discloses do not restrict specific device model, as long as can accomplish the components and parts of above-mentioned function all can.
Finally, it should be noted that the above list is only for the specific embodiment of the new concrete configuration in the testing laboratory, and does not limit the present invention. For the reinforced concrete structure sampled from the existing engineering, the process and method are completely consistent, and the details are not repeated here.
The embodiments of the present invention are merely provided to illustrate the embodiments of the present invention, and the protection scope of the present invention should not be construed as being limited to the specific forms of the embodiments, but also includes the equivalent technical means which can be conceived by those skilled in the art according to the present invention.
Claims (9)
1. An external steel bar corrosion in-situ nondestructive monitoring test device based on an electromagnetic field principle is characterized by comprising a sensor system and a three-dimensional precise positioning and moving system;
the sensor system comprises a magnetic induction intensity detection unit and a data processing unit; the magnetic induction intensity detection unit comprises a signal generator, a coil, a magnetic core, a packaging shell, a first Hall sensor and a second Hall sensor, wherein the coil is uniformly wound on the magnetic core, and two ends of the coil are electrically connected with a signal input end of the signal generator; the middle position of the reinforced concrete test piece clamped by the fixing unit corresponds to the middle position of the bayonet of the magnetic core; the packaging shell comprises a first Hall sensor placing groove, a second Hall sensor placing groove and a sealing cover; the first Hall sensor and the second Hall sensor are symmetrically arranged by taking a bayonet center line as an axis and are respectively arranged in a first Hall sensor placing groove and a second Hall sensor placing groove of the packaging shell; the data processing unit comprises a signal collector, a signal processor and a central controller, wherein the input end of the signal collector is electrically connected with the signal output ends of the first Hall sensor and the second Hall sensor, the signal output end of the signal generator and the output end of the signal collector are respectively electrically connected with the signal input end of the signal processor, and the signal output end of the signal processor is electrically connected with a port of the central controller;
the three-dimensional accurate positioning and moving system comprises a left-right moving and fixing unit, an up-down moving and fixing unit, a front-back moving and fixing unit and a clamping claw unit; the left-right moving and fixing unit comprises a left-right precession handle, a left-right precession bearing, an I-shaped sliding block, a bottom base and an upper polish rod and a lower polish rod; the screw-in handle is provided with a threaded hole, and the threaded hole is in threaded connection with the left screw-in bearing and the right screw-in bearing; the bottom base is provided with a dial scale for a tester to observe the left-right movement length of the reinforced concrete test piece, the bottom base is provided with an inverted T-shaped hole for an I-shaped sliding block to slide left and right in the bottom base, and the I-shaped sliding block is fixedly connected with a left-right precession bearing, an upper polish rod and a lower polish rod; the up-down moving and fixing unit comprises a first arc-shaped fixing clamp, an upper polish rod, a lower polish rod, a first screw rod and a first locking nut; the left side and the right side of the first arc-shaped fixing clamp are respectively provided with a fixing surface and a threaded hole, the first screw rod is connected with the first locking nut bolt through the threaded hole, and the fixing surface of the first arc-shaped fixing clamp and the first screw rod are in close contact with the left surface and the right surface of the upper polish rod and the lower polish rod; the front-back moving and fixing unit comprises a second arc-shaped fixing clamp, a second screw rod, a second locking nut and a front polish rod and a rear polish rod; the right side and the left side of the second arc-shaped fixing clamp are respectively provided with a fixing surface and a threaded hole, the second screw rod and the second locking nut are connected through the threaded hole by bolts, and the fixing surface of the second arc-shaped clamp and the second screw rod are in close contact with the left surface and the right surface of the front polished rod and the rear polished rod; the clamping jaw unit comprises a third screw rod, a third locking nut, a first dome screw rod, a second dome screw rod, a fourth locking nut, a fifth locking nut, a square rotating block, a jaw shell and a jaw accessory; the claw fittings comprise a left claw, a right claw, a rotary key and a connecting block, and the left claw and the right claw are fixedly connected with the claw shell.
2. The external steel bar corrosion in-situ nondestructive monitoring test device based on the electromagnetic field principle as claimed in claim 1, wherein in the magnetic induction intensity detection unit, the first hall sensor and the second hall sensor are symmetrically arranged, and the position of the steel bar is accurately detected through different magnetic induction intensities.
3. The external steel bar corrosion in-situ nondestructive monitoring test device based on the electromagnetic field principle as claimed in claim 1 or 2, wherein in the magnetic induction intensity detection unit, the magnetic core is made of silicon steel, and the packaging shell is made of plastic; the magnetic core bayonet socket be trapezoidal shape, can firmly block in the edge of reinforced concrete square column, accomplish the monitoring of single detection reinforcing bar corrosion, and can block not unidimensional reinforced concrete column according to the embedding degree of depth or change magnetic core bayonet socket distance.
4. The external steel bar corrosion in-situ nondestructive monitoring test device based on the electromagnetic field principle as claimed in claim 1 or 2, wherein in the magnetic induction intensity detection unit, the signal generator can stably control the current of the coil; the signal collector and the signal generator are respectively provided with a first indicator light and a second indicator light of a circuit, and the first indicator light and the second indicator light respectively prompt whether the signal collector and the signal generator work normally or not.
5. The external steel bar corrosion in-situ nondestructive monitoring test device based on the electromagnetic field principle as claimed in claim 1 or 2, wherein in the magnetic induction detection unit, a uniform electromagnetic field generated by a magnetic core of the magnetic induction detection unit and a uniformly wound coil depends on the coil current and the number of turns of the coil, so that demagnetization caused by time change is avoided, and the detection result is accurate; the electromagnet composed of the magnetic core, the coil with uniform winding and the signal generator can change the intensity of the electromagnetic field by controlling the current of the coil and the number of turns of the coil, the influence of magnetic leakage of an air domain caused by the change of the bayonet distance of the magnetic core can be effectively reduced by changing the intensity of the magnetic field, and the detection precision of the magnetic induction intensity of the sensor is improved.
6. The external steel bar corrosion in-situ nondestructive monitoring test device based on the electromagnetic field principle as claimed in claim 1 or 2, wherein the magnetic induction intensity detection unit is externally arranged on the reinforced concrete column so as to realize recycling and dynamic monitoring.
7. The external steel bar corrosion in-situ nondestructive monitoring test device based on the electromagnetic field principle as claimed in claim 1 or 2, wherein the data processing unit comprises a control coil working current, and magnetic induction intensity values of the first hall sensor and the second hall sensor are measured so as to calculate the corrosion rate, and the magnetic induction intensity measuring system and the data processing system complete data storage, post-processing and real-time display through a signal processor and a central controller.
8. The external steel bar corrosion in-situ nondestructive monitoring test device based on the electromagnetic field principle as claimed in claim 1 or 2, wherein in the three-dimensional precise positioning and moving system, the bottom base is provided with a dial scale for testers to visually and accurately measure the coordinate values of the left and right directions of the reinforced concrete test piece; scales are arranged on the upper and lower polish rods, so that a tester can visually and accurately measure coordinate values of the reinforced concrete test piece in the upper and lower directions; the front and rear polished rods are provided with scales for testing personnel to visually and accurately measure the coordinate values of the reinforced concrete test piece in the front and rear directions.
9. The external steel bar corrosion in-situ nondestructive monitoring test device based on the electromagnetic field principle as claimed in claim 1 or 2, wherein in the three-dimensional precise positioning and moving system, an arc-shaped space is reserved on the left side of the connecting block to allow the left part of the claw shell and the rotary key to move when extending and retracting, the connecting block is fixedly connected with the claw shell, the left part of the claw shell is fixedly connected with the rotary key, the claw shell is provided with a left through hole and a right through hole, wherein the left part and the right part of the claw shell are connected with a fifth locking nut through a second dome screw rod and a bolt, and the extension and retraction length of the clamping claw is controlled by controlling the screwing depth of the fifth locking nut; the effective clamping area of the clamping claw unit has a circular section with the diameter of 6-25 mm, so that reinforcing steel bars with different diameters can be firmly clamped; the left and right sides of the I-shaped sliding block are provided with threaded through holes; the bottom base is made of pig iron so as to prevent the whole device from tilting forward caused by overweight of a large reinforced concrete test piece; the rear part of the connecting block is provided with a threaded hole and is connected with the square rotating block and the front-back and fixing unit through a third screw and a third locking nut; the claw shell and the rotary key are provided with upper and lower thread through holes, and the rotary key and the claw shell are connected through a first round top screw and a fourth locking nut bolt; the third locking nut locks the rotating block connected with the front rotatable threaded rod to drive the clamping claw unit and the reinforced concrete test piece to rotate so as to ensure that the edge of the reinforced concrete test piece is embedded into the sensor bayonet; the left and right precession bearings can control the precession depth through the left and right precession handles, so that the operation of a tester is facilitated; the two sides of the arc-shaped fixing clamp are respectively provided with a fixing surface and a threaded hole, and the fixing surface, the first screw rod and the second screw rod are in close contact with the upper and lower polish rods and the front and rear polish rods through the threaded holes so that the arc-shaped fixing clamp is fixed with the upper and lower polish rods and the front and rear polish rods; after the first screw rod and the second screw rod are screwed out, the arc-shaped fixing clamp can move up and down along the upper polish rod and the lower polish rod, and the front polish rod and the rear polish rod can move back and forth along the first arc-shaped fixing clamp; the arc-shaped fixing clamp is fixedly connected with the first arc-shaped fixing clamp and the second arc-shaped fixing clamp in a mutually perpendicular mode, and a space is reserved for the first arc-shaped fixing clamp, the second arc-shaped fixing clamp and the front and rear polished rods to move.
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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 |
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