JP2001194341A - Device for judging soundness of reinforced concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for judging the soundness of a reinforced concrete to easily and correctly measure the soundness of the reinforced concrete without any measuring electrode or the like in contact with the surface of the reinforced concrete. SOLUTION: This device for judging the soundness of the reinforced concrete judges the soundness of a corroded point P of a reinforcing bar 12 by measuring the magnetic field on the objective surface for measurement or the vicinity thereof at many points with the surface of the reinforced concrete as the objective surface for measurement, and processing the data obtained in the multiple- point measurement to obtain the distribution of the current density of the reinforced concrete.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for judging the soundness of reinforced concrete, and more particularly to an apparatus for judging the soundness of reinforced concrete inside reinforced concrete and the soundness of reinforced concrete used for determining the corrosive environment inside reinforced concrete.

[0002]

BACKGROUND OF THE INVENTION Determining the soundness of reinforced concrete, particularly whether the reinforced concrete is in a corroded state or whether the reinforced concrete is easily corroded, is extremely important in the maintenance and management of reinforced concrete. It becomes important.

Conventionally, the self-potential method and the electric resistance method have been used to make such a determination.

As a judgment method using the self-potential method, there is a method of detecting the corrosion of the reinforcing bar by measuring the potential between the reinforcing bar and the concrete surface, particularly the potential generated due to the corrosion of the reinforcing bar at multiple points.

As another judging method using the self-potential method, there is a method in which a potential difference on the surface of reinforced concrete is measured at multiple points, and corrosion of the reinforcing bar is detected based on the potential difference at each measurement point.

As a judgment method using the electric resistance method, there is a method in which a voltage is biased between electrodes in contact with the surface of reinforced concrete and the resistance between the electrodes is measured. By performing such a measurement at multiple points on the reinforced concrete surface, the specific resistance distribution on the reinforced concrete surface can be measured, and the soundness of the reinforced concrete is determined based on this specific resistance distribution.

[0007] In each of the conventional determination methods,
The measurement must be performed while moving the measurement electrode for each measurement point. For this reason, there is a problem that it takes time and effort to obtain measurement data from many measurement points on the concrete surface.

Further, in the above-mentioned conventional determination method, a measurement electrode is brought into contact with the surface of reinforced concrete to measure a potential difference and a resistance value. For this reason, when the reinforced concrete surface is coated with an insulating material, there is also a problem that the measurement for determination cannot be performed unless this is removed.

Further, when there is a member near the contact portion of the measuring electrode that has a significantly different conductivity from concrete, for example, a reinforcing bar or a large aggregate, a measurement error occurs and an accurate soundness determination is made. There was also a problem that it was difficult to do.

The present invention has been made in view of such conventional problems, and an object of the present invention is to simplify the soundness of reinforced concrete in a non-destructive state without requiring a measuring electrode or the like which comes into contact with the reinforced concrete surface. It is an object of the present invention to provide a reinforced concrete soundness judging device capable of performing accurate and accurate measurement.

[0011]

Means for Solving the Problems (1) In order to achieve the above object, a soundness determination apparatus for reinforced concrete according to the present invention uses a surface of reinforced concrete as a measurement target surface and measures a magnetic field on or near the measurement target surface. It is characterized by including sensor means for performing multi-point measurement and processing means for processing the data obtained by the multi-point measurement to determine the soundness of the reinforced concrete.

The present invention employs a configuration in which the magnetic field at or near the measurement surface of reinforced concrete is measured at multiple points, and the data obtained thereby is processed to determine the soundness of the reinforced concrete. Therefore, since a probe that makes electrical contact with the reinforced concrete surface is not required, the soundness of the reinforced concrete can be determined quickly and easily, and even when the reinforced concrete surface is coated with an insulating material. Thus, the soundness can be accurately determined.

Further, according to the present invention, since the magnetic field is measured, even if a large aggregate exists near the measurement point on the surface of the reinforced concrete, the soundness of the reinforced concrete can be determined satisfactorily. .

Here, it is preferable that the magnetic field sensor measures a magnetic field substantially parallel and substantially perpendicular to the surface to be measured. More preferably, the magnetic sensor may be formed so as to measure magnetic fields in two different horizontal directions, more preferably two orthogonal directions, in a horizontal plane substantially parallel to the surface to be measured.

Further, each of the magnetic field sensor means includes a detecting unit for measuring a magnetic field in a direction substantially parallel to the surface to be measured, and a detecting unit for measuring a magnetic field in a direction substantially perpendicular to the surface to be measured. It may be formed.

Here, it is preferable that the detecting section for measuring a magnetic field in a substantially parallel direction is formed by combining a plurality of detecting sections for measuring a magnetic field in two directions intersecting each other, more preferably two directions orthogonal to each other.

Further, it is preferable that each of the magnetic sensors is formed by unitizing a detection unit for measuring a magnetic field in a substantially parallel direction and a detection unit for measuring a magnetic field in a substantially vertical direction.

(2) Preferably, the sensor means includes a plurality of magnetic sensors arranged based on a predetermined rule, and measures the magnetic field on the surface of the reinforced concrete to be measured or in the vicinity thereof at multiple points.

By adopting the above configuration, it is possible to more accurately determine the soundness of reinforced concrete.

Here, the plurality of magnetic sensors are:
It is preferable to form them in a matrix based on a predetermined rule.

With the above configuration, when it is determined that an abnormality or the like exists in the reinforced concrete, it is possible to accurately specify the portion by simple data processing.

(3) Preferably, the distance between the magnetic sensors is set to at least 1/2 or less of the distance between the reinforcing bars in the reinforced concrete.

Usually, the interval between the reinforcing bars in the reinforced concrete is as narrow as about 10 cm, so that the interval between the magnetic sensors is preferably set to 5 cm or less. This makes it possible to more accurately determine the soundness of the reinforced concrete.

(4) Further, it is preferable that the sensor means is formed so as to be in contact with an arbitrary surface of the reinforced concrete to be measured and to measure the magnetic field at multiple points.

With the above configuration, it is possible to easily and accurately determine the soundness of an arbitrary portion of reinforced concrete.

(5) Preferably, the sensor means includes a background canceling means for generating a magnetic field for canceling a background magnetic field.

That is, in an environment where the device of the present invention is used, in addition to the magnetic field generated from inside the reinforced concrete,
A geomagnetic field, a magnetic field generated from a transmission line, or the like exists as a background magnetic field. According to the present invention, the soundness of reinforced concrete can be more accurately determined by canceling out such background magnetic field.

Here, it is preferable that the background canceling means is formed so as to cancel the background magnetic field existing in the magnetic field detecting direction of each magnetic sensor.

For example, when each magnetic sensor measures a magnetic field in two directions on a horizontal plane substantially parallel to the measurement surface and a magnetic field in a direction substantially perpendicular to the measurement surface, a total of three magnetic fields are measured. The background canceling means may be formed so as to cancel all background magnetic fields in three directions. As such a background canceling means, for example, a plurality of loops for individually generating a magnetic field in each measurement direction are provided, and the loops are formed integrally with the sensor means. Then, before the start of the measurement, a current is supplied to each loop so that the magnetic field in each measurement direction detected by the specific magnetic sensor becomes zero, thereby canceling the background magnetic field.
After such setting, the soundness of the reinforced concrete may be determined using the apparatus of the present invention.

The effect of the background magnetic field is
The offset can be achieved by using the following method.

That is, in the present invention, the processing means calculates a difference of each magnetic field data obtained by the multipoint measurement with respect to predetermined data based on a predetermined rule, and calculates a background magnetic field influence component included in the measurement data. Is preferably performed.

For example, by calculating a difference between each magnetic field data obtained by the multipoint measurement and the magnetic field data obtained by a specific sensor, a common background magnetic field influence component included in the measurement data is removed. It is possible to make an accurate soundness determination.

Here, as a specific sensor for performing the difference calculation, any one of the plurality of sensors may be appropriately selected and used according to a given rule, and a sensor for removing a background influence component may be used. A special sensor may be specially provided and used as a sensor for calculating the difference.

(6) The processing means determines the soundness of the rebar existing in the reinforced concrete on the surface to be measured by processing the DC component data of each magnetic field data obtained by the multipoint measurement. Is preferred.

By processing the DC component data of each magnetic field data as described above, when corrosion occurs in a reinforcing bar present in reinforced concrete, the occurrence can be detected.

Here, the processing means processes the DC component data, which is included in each magnetic field data obtained by the multipoint measurement and which is horizontal and substantially vertical to the surface to be measured, so that the reinforced concrete on the surface to be measured is processed. It is preferable to form so as to determine the soundness of the rebar existing in the steel.

Further, the processing means generates first contour map data based on DC component magnetic field data in a direction substantially parallel to the surface to be measured measured by each of the magnetic sensors, and performs measurement by each of the magnetic sensors. The second contour map data is generated based on the obtained DC component magnetic field data substantially perpendicular to the surface to be measured, and the corrosion position of the reinforcing bar inside the reinforced concrete is specified based on the generated first and second contour map data. It is preferable to form it.

By obtaining the magnetic field distribution and the current density distribution on or near the surface to be measured of the concrete as the contour diagram data, it is possible to accurately specify the corrosion activity of the reinforcing steel inside the reinforced concrete and its position.

(7) According to the present invention, not only the occurrence and location of corrosion of the reinforcing steel inside the reinforced concrete, but also
The corrosive environment inside the reinforced concrete can also be determined.

That is, in the present invention, it is preferable that the processing means determines the corrosive environment inside the reinforced concrete on the surface to be measured by processing the AC component data of each magnetic field data obtained by the multipoint measurement. .

That is, each magnetic field data obtained by the multipoint measurement includes an AC component in addition to the DC component described above. The data of the AC component can be used as effective data only for specifying the corrosive environment inside the reinforced concrete. By using this AC component data, the corrosive environment inside the reinforced concrete can be determined.

Here, the processing means obtains the specific resistance distribution of the reinforced concrete by processing the AC component data of each magnetic field data obtained by the multipoint measurement, and determines the corrosion inside the reinforced concrete based on the specific resistance component. It is preferable to determine the environment.

(8) The above-mentioned magnetic sensors include:
Various types can be used. For example, a magnetic sensor using a magnetoresistive element, a magnetic sensor using a Hall element that detects a magnetic field by the Hall effect, and a superconducting magnetic element (SQUID), A flux gate element or the like may be used as needed. It is needless to say that other sensors may be used as the magnetic sensor as needed.

[0044]

Next, preferred embodiments of the present invention will be described in detail with reference to the drawings.

(1) Overall Configuration FIGS. 1 and 2 show a preferred embodiment of a reinforced concrete soundness judging apparatus to which the present invention is applied.
Is a schematic side view of the sensor, and FIG. 2 is a front view of the sensor unit.

The soundness determination apparatus of the present embodiment includes a sensor unit 100 having any surface 14 of reinforced concrete 10 to be measured as a measurement surface, a scanner 200, and a computer 300 functioning as processing means. .

The sensor section 100 includes a plurality of magnetic sensors 110 arranged in a matrix according to a predetermined rule, a holding member 120 for holding each magnetic sensor 100, and an electromagnetic shield section 130, and is integrally formed as a whole. The contact surface 102 is configured to contact a desired position on the surface 14 of the reinforced concrete 10.

In this embodiment, as the holding member 120, styrene foam is used.

The electromagnetic shield 130 is provided on the contact surface 10.
The sensor unit 100 is formed so as to cover the periphery of the sensor unit 100 excluding the area 2 in a lid shape.

(2) Sensor Unit FIG. 2 is a schematic explanatory view of the sensor unit 100 viewed from the contact surface 102 side.

The sensor unit 100 of the embodiment has a contact surface 102
A plurality of magnetic sensors 110 arranged in a matrix are opposed to the reinforced concrete surface 14 via the contact surface 102 and measure the magnetic field at or near the surface 14 at multiple points. ing.

Each magnetic sensor 110 is formed to have a smaller interval than the arrangement interval of the reinforcing bars 12 of the reinforced concrete 10 to be measured. It is preferable that the arrangement interval of the magnetic sensors 110 according to the present embodiment be equal to or less than の of the arrangement interval of the reinforcing bars, and the minimum arrangement interval of the reinforcing bars of the reinforced concrete is considered to be 10 to 15 cm. The arrangement interval of the sensor 110 is 5 cm, which is half that
It is preferable to set the interval to a degree or less.

FIG. 3 shows the structure of the magnetic sensor 110.

The magnetic sensor 110 of the embodiment has the contact surface 10
2 is configured to measure a magnetic field in a direction substantially perpendicular to the direction 2 and a magnetic field in a direction substantially parallel to the contact surface 102. In particular, the magnetic sensor 110 of the present embodiment
It is configured to measure magnetic fields in three directions of X, Y, and Z.

In the figure, the X and Y axes correspond to the contact surface 102.
Represents two directions orthogonal to each other in a horizontal plane substantially parallel to
The axis represents a direction orthogonal to the contact surface 102.

The magnetic sensor 110 of the embodiment has a Z
A first detecting unit 112Z and a second detecting unit 11 for individually measuring the magnetic field strengths in the axial direction, the X-axis direction, and the Y-axis direction, respectively.
2X and the third detector 112Y are formed as one unit.

With the above configuration, the contact surface 10
The strength of the magnetic field in the Z-axis direction orthogonal to
2Z, and the strength of the magnetic field in a direction substantially parallel to the contact surface 102 can be detected by the second and third detectors 112X,
The detected value of 112Y can be measured as a value synthesized in a vector manner.

Each of these detectors 112Z, 112X, 11
2Y can be formed using various elements such as a magnetoresistive element, a Hall element, a superconducting magnetic element (SQUID), and a flux gate element. In this embodiment, a magnetoresistive element is used.

The magnetoresistive element is configured to sense a magnetic field in a predetermined direction using a so-called magnetoresistive effect. Since the specific configuration is already known, the description thereof is omitted here.

With the above configuration, the sensor unit 100 of the embodiment can be connected to the reinforced concrete 10 to be measured.
The magnetic field in a direction perpendicular to the reinforced concrete surface 14 is detected by the first detection unit 112Z, and the magnetic field substantially parallel to the concrete surface 14 is detected by the second and 3 detecting unit 112
X, 112Y.

In this embodiment, the sensor unit 10
Since a plurality of magnetic sensors 100 are arranged in a matrix along the zero contact surface 102 as shown in FIG. 2, the magnetic field of the concrete surface 14 can be measured at multiple points.

The scanner 200 sequentially supplies detection signals of the magnetic sensors 110 arranged in a matrix to the computer 300 in a predetermined order. Note that the scanner 200
Is preferably provided integrally with or near the sensor unit 100.

The computer 300 functions as a processing means, and determines the soundness of the reinforced concrete 10 by processing the data sequentially supplied as described above.

In the present embodiment, soundness such as corrosion of the reinforcing bar 12 existing inside the reinforced concrete 10 is determined, and whether the reinforced concrete 10 is indirectly in a corrosive environment is determined.

The details will be described below.

(3) Determining Soundness of Corrosion of Reinforcing Bar, etc. FIG. 4 schematically shows a state in which corrosion has occurred in an area P having the reinforcing bar 12 inside the reinforced concrete 10.

As shown in FIG. 4A, when corrosion occurs in the reinforcing steel 12, a direct current flows in the reinforced concrete 10 in the direction indicated by the arrow 1000 starting from the corrosion point P of the reinforcing steel. Then, a magnetic field is generated with respect to this DC current in the direction indicated by arrow 2000 in the figure.

That is, when corrosion occurs in the reinforcing bar 12,
The chemical reaction in which iron is oxidized proceeds. At this time, ions are generated around the corrosion point P, and an arrow 1000 in FIG.
An electromotive force that causes a current to flow in the direction indicated by is generated. Specifically, a current flows toward both sides of the reinforcing bar 12 around the corrosion point P, and the current circulates inside the concrete and returns to the corrosion point P. When the current flows in this manner, a magnetic field is generated in the direction indicated by arrow 2000 in the figure.

FIG. 4B is a schematic sectional view taken along the line AA of FIG. 4A. As shown in the figure, a magnetic field H is generated around the rebar 12 due to the current flowing through the rebar 12. As shown in FIG. 4C, the intensity of the magnetic field H on the concrete surface or in the vicinity thereof is detected as a substantially vertical component H _V and a horizontal component H _H by each magnetic sensor arranged in a matrix.

FIG. 4C shows each magnetic sensor 110.
_Represents the distribution of DC components H _V , H _H contained in the substantially vertical and horizontal magnetic fields detected by.

The computer 300 controls each magnetic sensor 11
0 based on the value of the H _V and H _H to be measured, as shown in FIG. 5, to generate a contour diagram showing the magnetic field distribution and current density distribution of the concrete surface. FIG. 5A is a contour diagram created based on the substantially vertical component H _V , and FIG. 5B is a contour diagram created based on the horizontal component H _H.

Therefore, the reinforcing bars 12 inside the reinforced concrete
When corrosion or the like occurs in the concrete, the current flowing inside the concrete due to the corrosion causes the electric current shown in FIGS.
The magnetic field distribution and the current density distribution as shown in (1) and (2) can be obtained, whereby it is possible to determine the occurrence of corrosion of the reinforcing bar and its activation state (corrosion progress rate).

In addition, as shown in FIGS. 4 (B) and 4 (C), two points 14a and 14b where the absolute value of the substantially vertical component H _V of the magnetic field is maximum, and the reinforcing bar 12 The connecting lines make a 45 degree angle with the concrete surface 14. Therefore, as shown in FIG. 4C, the magnetic fields H _V and H _H are measured to specify the two points 14a and 14b shown in FIG. 4B and to determine the positions 14a and 14b of the two points. 14
From b, it is possible to specify the spatial position of the reinforcing bar 12 in the reinforced concrete 14 through which the current flows.

The distribution shown in FIGS. 5A and 5B obtained when corrosion or the like occurs in the reinforcing bar 12 is shown in FIG.
5 shows a specific pattern centered on the corrosion point P.
Therefore, from the distributions shown in FIGS. 5A and 5B, when corrosion occurs in the reinforcing bar 12 in the reinforced concrete 10,
The position of the corrosion point P can be specified accurately.

In the above description for determining the soundness of the reinforced concrete 10, for the sake of simplicity, the case where corrosion has occurred in one place of the reinforced concrete 10 has been described. However, in practice, corrosion may occur at a plurality of locations of one reinforcing bar 12, or corrosion may occur at a plurality of reinforcing bars. In such a case, FIG.
Substantially (only H _V in the drawing) data of the magnetic field distribution in the vertical and horizontal inversion of reinforced concrete surfaces obtained (A), a namely by inverse analysis, shown in FIG. 11 (B) Thus, the magnetic field distributions H _V1 , H _V2 ... For each corrosion point can be obtained, and as a result, the existence and positions of a plurality of corrosion sites P existing inside the reinforced concrete 10 can be detected.

(4) Judgment of Soundness of Corrosion Environment of Reinforced Concrete As described above, soundness judgment such as corrosion of the reinforcing bar 12 existing in the reinforced concrete 10 is performed in substantially vertical and horizontal directions of the magnetic field detected by the magnetic sensor 110. This is performed based on the DC component included in the magnetic field of.

However, in an environment where the reinforced concrete 10 or the like exists, various AC magnetic fields often exist as a background, and in such an environment, the AC magnetic field existing as a background causes And an alternating current flows. The magnetic sensor 110 detects the magnetic field caused by the generation of such an alternating current as a substantially vertical AC component H ′ _V and a horizontal AC component H ′ _H as described above.

From the substantially vertical and horizontal AC components H ′ _V and the horizontal AC component H ′ _H thus detected, the specific resistance ρ of the reinforced concrete 10 is obtained based on a function expressed by the following equation. It is known. ρ = f ((H ′ _V / H ′ _H ) ² ) Specifically, it is known that there is a proportional relationship between (H ′ _V / H ′ _H ) ² and the specific resistance ρ. .

Accordingly, the computer 300 can determine the specific resistance distribution of the reinforced concrete 10 from the values of the substantially vertical and horizontal components of the magnetic field measured by each magnetic sensor 110.

FIG. 6 shows the resistivity ρ of reinforced concrete.
And the corrosiveness of reinforced concrete.

The computer 300 calculates the reinforced concrete 1 based on the resistivity distribution of the reinforced concrete 10 obtained as described above and the evaluation data shown in FIG.
0 is indirectly determined to be in a corrosive environment.

(5) Cancellation of Background Noise By the way, in an environment where the sensor unit 100 is used, background noise such as terrestrial magnetism and other magnetic fields (for example, a magnetic field generated from a transmission line) exists. Since the magnetic field existing as the background is relatively large,
Unless this is offset, soundness cannot be determined accurately.

In the apparatus of this embodiment, as a method for canceling such a background, one of the following two methods is appropriately employed.

(5-1) First Method for Canceling Background One of a plurality of magnetic sensors 110 arranged in a matrix is used for detecting a reference value of the background.
The detection value of the sensor for detecting the reference value is
Is performed from the detected value.

By performing such a difference calculation process, the influence of the background is relatively offset from the detection value of each sensor 110, and as a result, the influence of the background noise is relatively offset. Also, contour map data can be obtained.

By using the contour data, the influence of the background can be canceled and the soundness of the reinforcing bar 12 inside the reinforced concrete 10 can be determined.

As the sensor for detecting the reference value of the background, any one of the magnetic sensors 110 arranged in a matrix as described above may be used. A dedicated sensor for detecting the reference value of the ground may be provided to perform the difference calculation processing as described above.

(5-2) Another method for canceling the influence of the background The sensor unit 100 is provided with a background canceling means for generating a magnetic field of the background.

For example, a sensor 110BG for background detection is provided at any position of the sensor unit 100. This sensor 110BG is formed similarly to other magnetic sensors 110 arranged in a matrix.

Then, as shown in FIG.
10BG and a plurality of sensor groups 11 arranged in a matrix
0 cancels the background magnetic field in the Z-axis direction, the X-axis direction, and the Y-axis direction, respectively.
A first loop 140Z, a second loop 140X, and a third loop 140 for respectively generating a magnetic field in the Y-axis direction
Y is provided in the sensor unit 100.

These three sets of loops 140Z, 140X,
140Y functions as a coil for generating a magnetic field for canceling the background by applying a current to each.

Prior to performing the soundness determination using the sensor unit 100, the background magnetic fields in the three directions of the Z-axis, X-axis, and Y-axis detected by the magnetic sensor 110BG become zero. As such, each loop 140Z, 1
Electricity is supplied to 40X and 140Y to set a state in which the influence of the background can be removed. In such a state, the magnetic sensors 110 arranged in a matrix are arranged.
Of the background will also be eliminated.

In this state, the soundness of the reinforced concrete 10 can be accurately determined without being affected by the background by bringing the sensor section 100 into contact with the desired surface 14 of the reinforced concrete 10.

Although the case where the dedicated magnetic sensor 110BG for detecting the background is provided has been described as an example, one of the magnetic sensors arranged in a matrix is used as a magnetic sensor for detecting the background. Alternatively, the same processing as described above may be performed.

(6) Specific Example of Determination Circuit FIG. 8 shows an example of a functional block diagram of a soundness determination device to which the present invention is applied.

In the embodiment, the computer 300
An output unit 340 such as a display, an input unit 350 such as a keyboard, etc., and a background correction unit 31
0, the scanner control unit 320 also functions as the processing unit 330 that performs the above-described determination processing and outputs the determination result to the output unit 340.

Prior to the above-described soundness determination process, the background correction unit 310 determines whether each loop 140Z, 1
Control is performed such that the values of the background magnetic field in the Z-axis direction, the X-axis direction, and the Y-axis direction detected by the background correction sensor 110BG become 0 by controlling the currents supplied to the 40X and 140Y. Specifically, based on the detection data of the sensor 110BG, the loop drive unit 142 is controlled, and the current supplied to each of the loop groups 140Z, 140X, 140Y is detected by the sensor 110BG in the Z axis, the X axis, and the Y axis.
Control is performed such that the value of the background magnetic field in the axial direction becomes zero.

The scanner control unit 320 controls the scanner 2
00 and the magnetic sensors 110 arranged in a matrix.
The control is performed so that the data detected in step (1) is sequentially taken into the processing unit 330.

The processing section 220 performs the above-described soundness determination processing based on the data thus obtained, and outputs the determination result to the output section 340.

FIG. 9 is a flowchart showing the operation of the apparatus according to the present embodiment.

First, in step S10, the current flowing through each of the loops 140Z, 140X, and 140Y is controlled using the background correction unit 310 so that the influence of the magnetic field acting on the sensor unit 100 as the background is eliminated.

Then, the determination operation of steps S20 to S50 is performed.

First, the sensor unit 100 is brought into contact with a desired surface 10 of the reinforced concrete 10, and data collection for determination is started.

At this time, the magnetic sensors 110 arranged in a matrix are sequentially scanned, and the detection data is taken into the computer 300.

Next, in step S30, based on the obtained data, a magnetic field distribution and a current density distribution on the surface of the reinforced concrete as shown in FIG. 5 are created, and the soundness of the reinforcing steel present inside the reinforced concrete 10 is determined. Do.

Further, in step S10, a resistivity distribution on the surface of the reinforced concrete is created based on the obtained data, and whether or not the reinforced concrete is in a corrosive environment is indirectly evaluated.

Then, in step S50, step S3
0, the results of the determination and evaluation obtained in S40 are output to the output unit 34.
Output to 0. Specifically, it is displayed on a display or printed out from a printer or the like.

As described above, according to the soundness judging device of the present embodiment, the sensor section 100 is only brought into contact with a desired surface of the reinforced concrete 10 and the contact area is set as a measurement target surface, and the soundness of the reinforced concrete 10 is measured. Sex determination can be performed quickly and easily.

It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention.

For example, in the above-described embodiment, the case where the magnetic field in the substantially vertical and horizontal directions of the concrete surface is exposed has been described as an example. However, the present invention is not limited to this. Good measurement results can be obtained by measuring only one direction.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory diagram of a reinforced concrete soundness determination device to which the present invention is applied.

FIG. 2 is a schematic front explanatory view of a sensor unit.

FIG. 3 is a schematic explanatory view of a magnetic sensor used in a sensor unit.

FIG. 4A is a diagram illustrating the principle of generating a magnetic field when corrosion occurs in a reinforcing bar, and FIG.
FIG. 2C is a schematic explanatory view taken along the line AA, and FIG. 2C is an explanatory view of a magnetic field in the substantially vertical and horizontal directions on the concrete surface of FIG.

FIG. 5A is a contour diagram showing a magnetic field distribution created based on a substantially vertical component of a magnetic field on a concrete surface, and FIG. 5B is a contour diagram created based on a horizontal component. is there.

FIG. 6 is an explanatory diagram showing the relationship between the resistivity and the corrosiveness of reinforced concrete.

FIG. 7 is an explanatory diagram illustrating an example of a background canceling unit provided in a sensor unit.

FIG. 8 is an explanatory diagram illustrating an example of a functional block diagram of the device according to the embodiment;

FIG. 9 is a flowchart showing the operation of the apparatus of the embodiment.

FIG. 10A is an explanatory view of a substantially vertical magnetic field when corrosion occurs at a plurality of locations on a reinforcing bar, and FIG.
It is explanatory drawing of the magnetic field corresponding to each corrosion location obtained by inversely transforming the magnetic field of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Reinforced concrete 12 Reinforcement 14 Surface P Corrosion point 100 Sensor part 102 Contact surface 110 Magnetic sensor 120 Holding member 130 Electromagnetic shield part 200 Scanner 300 Computer

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Masami Ochiai, Inventor 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Kiyoshi Kurabayashi 1-1-7-1 Kyobashi, Chuo-ku, Tokyo Inside Toda Construction Co., Ltd. (72) Inventor Ichiro Sekine 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Akira Saito 1-23-1, Oi, Shinagawa-ku, Tokyo Mitsui Kin (72) Inventor Yoshiteru Dobashi 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Incorporated (72) Inventor Kozo Sato 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu 2G053 AA11 AA14 AB11 AB14 AB19 BA02 BA21 CA18

Claims (13)

[Claims] A surface of the reinforced concrete as a measurement target surface, a sensor means for measuring a magnetic field at or near the measurement target surface at multiple points, and processing the data obtained by the multipoint measurement to obtain the reinforced concrete surface. A processing device for determining soundness, comprising: a soundness determining device for reinforced concrete. 2. The reinforced concrete soundness judging device according to claim 1, wherein the magnetic field sensor measures magnetic fields substantially parallel and substantially perpendicular to the surface to be measured. 3. The magnetic field sensor according to claim 2, wherein each of the magnetic field sensor units includes: a detecting unit that measures a magnetic field in a direction substantially parallel to the surface to be measured; and a detecting unit that measures a magnetic field in a direction substantially perpendicular to the surface to be measured. An apparatus for judging the soundness of reinforced concrete, comprising: 4. The sensor according to claim 1, wherein the sensor means includes a plurality of magnetic sensors arranged based on a predetermined rule, and performs multipoint measurement of a magnetic field on a surface to be measured of reinforced concrete or in the vicinity thereof. A soundness determination device for reinforced concrete, characterized in that: 5. The magnetic sensor according to claim 4, wherein the plurality of magnetic sensors are arranged in a matrix based on a predetermined rule, and an interval between the magnetic sensors is at least 以下 or less of an interval between reinforcing bars of reinforced concrete. Apparatus for determining the soundness of reinforced concrete. 6. The reinforced concrete soundness judging device according to claim 1, wherein the sensor means abuts on an arbitrary surface of the reinforced concrete to be measured and measures the magnetic field at multiple points. 7. An apparatus according to claim 1, wherein said sensor means includes a background canceling means for generating a magnetic field for canceling a background magnetic field. 8. The method according to claim 1, wherein the processing unit calculates a difference of each magnetic field data obtained by the multipoint measurement with respect to predetermined data based on a predetermined rule, and is included in the measurement data. An apparatus for judging the soundness of reinforced concrete, characterized by performing a process of removing a magnetic field influence component of a background. 9. The method according to claim 1, wherein the processing unit is configured to process DC component data of each magnetic field data obtained by the multipoint measurement, so that the DC component data is present in the reinforced concrete on the surface to be measured. An apparatus for judging the soundness of reinforced concrete, which judges the soundness of reinforcing steel. 10. The method according to claim 9, wherein the processing unit is included in each magnetic field data obtained by the multipoint measurement.
A soundness determination device for reinforced concrete, wherein soundness of a reinforcing bar present in reinforced concrete on a measurement target surface is determined by processing DC component data that is horizontal and substantially vertical to the measurement target surface. 11. The data processing apparatus according to claim 1, wherein the processing unit generates first contour diagram data based on DC component magnetic field data measured in a direction substantially parallel to the surface to be measured, measured by each of the magnetic sensors. While generating, generates second contour map data based on DC component magnetic field data in a direction substantially perpendicular to the measurement target surface measured by each of the magnetic sensors, and generates the first and second contour map data. An apparatus for judging the soundness of reinforced concrete, wherein a corrosion position of the reinforcing steel in the reinforced concrete is specified based on the determined position. 12. The corrosive environment inside the reinforced concrete on the surface to be measured by processing the AC component data of each magnetic field data obtained by the multipoint measurement according to any one of claims 1 to 11, A soundness determination device for reinforced concrete, characterized in that the determination is made as follows. 13. The method according to claim 12, wherein the processing unit obtains a specific resistance distribution of the reinforced concrete by processing AC component data of each magnetic field data obtained by the multipoint measurement, based on the specific resistance component. An apparatus for judging the soundness of reinforced concrete, which judges the corrosive environment inside reinforced concrete.