JP3441679B2 - Search method and position confirmation sheet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention radiates a wave signal of an electromagnetic wave or a sound wave into the medium from a transmitter while moving on the surface of the medium, and reflects a signal from an object existing in the medium or the object. According to the signal strength or phase information of the received signals received at the plurality of positions (x, y) on the surface of the medium by the receiving unit. The present invention relates to an exploration method for exploring the position of.

[0002]

2. Description of the Related Art As an exploration method of this kind, for example, when exploring a concrete concealed pipe buried in a concrete wall from the surface of the concrete wall, the pulse from an object and the transmitting antenna that emits a pulse signal by electromagnetic waves An exploration device equipped with a receiving antenna that receives the reflected wave of the signal, sequentially receives the above-mentioned reflected pulse signals while scanning the surface of the concrete wall, and reflects the scanning position (x, y) with respect to the reflected signal intensity. Three-dimensional data having time t as a coordinate is generated, and predetermined three-dimensional data is generated for the three-dimensional data.
There is a method of performing a two-dimensional display or a three-dimensional display of the position of the concealed pipe by performing dimensional data processing or the like and searching.

In the case of a popular type surveying device capable of measuring the movement distance, it is necessary to draw a parallel line indicating the movement route of the surveying device on the surface of the concrete wall in advance and scan the surveying device along the line. . For example, if parallel lines are drawn along the x direction at equal intervals in the y direction, the x coordinate can be known from the movement distance of the exploration device, and the y coordinate can be known at the position (rank) of the parallel line during scanning, so that it is constant. If the receiving process is performed every time the distance is moved, the received signal strength can be associated with the position (x, y) on the surface of the concrete wall, and the above three-dimensional data can be correctly generated.

However, in the above case, it is necessary to draw parallel lines on the surface of the medium to be searched for associating with the above-described position coordinates on the medium surface before the search. The work becomes complicated, and there is a risk of human error by the operator. For example, if the distance between the parallel lines deviates, an accurate search cannot be performed.

On the other hand, there has been proposed a system which saves the trouble of drawing parallel lines on the surface of the medium and allows the scanning of the exploration device to be automatically performed. For example, the one that is equipped with the moving mechanism of the transmitting / receiving unit of the exploration device and integrated with the exploration device main body,
It is disclosed in Japanese Patent Laid-Open No. 10-48348. However, there is a problem in that the exploration device including the moving mechanism of the transmission / reception unit requires a large scale, which increases weight and manufacturing cost. In particular, when exploring a vertical wall surface, it is difficult to support and fix the entire heavy exploration device on the wall surface.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and its purpose is to enable the use of a lightweight and compact popular exploration device, and An object of the present invention is to provide an exploration method that enables simple and accurate exploration.

[0007]

The first characteristic constitution of the exploration method according to the present invention for attaining this object is, as described in claim 1 of the scope of claims, a concrete medium. > Frequency moves from 100MHz to 1 while moving on quality surface
It said wave signal by the electromagnetic waves in the GHz range concrete
Radiating from the transmission unit to over preparative medium, received by the receiver of the reflected signal from an object present in said concrete medium, anti at a plurality of locations on the concrete medium surface (x, y)
A probing method for probing the position of the object based on the signal strength of the received signals received for morphism time t, the co
The position confirmation sheet is arranged on the concrete medium surface so as to correspond to the position (x, y) on the surface of the concrete medium, and 1 cm to 1 cm attached to the position confirmation sheet.
The point is to move and search the transmitting unit and the receiving unit along the position confirmation display, which is parallel lines or a grid at equal intervals within a range of 0 cm .

According to the second characteristic constitution, as described in claim 2 of the scope of claims, in addition to the above-mentioned first characteristic constitution, an object in the medium has a longitudinal axis in a specific direction. In this case, the equidistant parallel lines are disposed so as to be inclined with respect to the estimated longitudinal axis direction of the object.

The third characteristic configuration is, in addition to the above-mentioned second characteristic configuration, as described in claim 3 of the scope of claims, the estimated object of the parallel lines at equal intervals. The angle with respect to the longitudinal axis direction is within the range of 30 ° to 90 °.

[0010] the fourth characterizing feature of the can, as noted in claim 4 column claims, in addition to the first feature configuration described above, the parallel lines of the equal intervals, with respect to the vertical direction 30 °
It is located at an angle of 60 ° to 60 °.

[0012] The fifth characteristic configuration is the section of the claims.
As described in claim 5, said first to fourth features
In addition to the configuration, the position confirmation sheet is made of a transparent material.
It is in the point that it is made.

As the position confirmation sheet of the characteristic structure of the exploration method described so far, the exploration described in claims 1 to 5 is as described in claim 6 of the claims section. It is used as the position confirmation sheet of the method, can be configured with the position confirmation display, and can be suitably used.

The operation and effect will be described below. According to each characteristic configuration of the exploration method according to the present invention, the position confirmation sheet is arranged on the medium surface so as to correspond to the position (x, y) on the medium surface, and the position confirmation sheet For example, in order to move and search the transmitting unit and the receiving unit along the predetermined position confirmation display on the surface, draw lines such as parallel lines for associating with the position coordinates on the medium surface. No complicated work is required. Further, since it is not necessary to provide a moving mechanism for scanning the transmitting / receiving unit on the surface of the medium, it is possible to use a light-weight and compact popular type exploration device, and moreover, the scanning of the exploration device on the medium surface is performed. By performing along the confirmation display, the reception position (x, y) of the reception signal can be accurately specified on the surface of the medium. Therefore, in the medium based on the signal strength or phase information of the reception signal that can be accurately specified. The position of the object can be searched accurately. Further, the sheet can be arranged very easily as compared with the work in which the worker draws parallel lines on the surface of the medium, so that the accurate search can be easily performed.

Further, if the position confirmation sheet is removed, the position confirmation display on the surface of the medium disappears, so that the work of erasing the display from the surface of the medium is naturally unnecessary. In addition, even after confirming the position on the medium surface based on the exploration result after completion of the exploration, by arranging the same position confirmation sheet on the same medium surface, the correspondence between the exploration result and the position on the medium surface It can be easily attached. That is, it is possible to save the trouble of separately measuring the position on the surface of the medium.

Further, according to the first characteristic configuration, since the exploration device can be moved along the parallel lines or the grid at equal intervals , the receiving position (x, y) on the medium surface. Can be densely arranged in a matrix. More specifically, with respect to the received signal strength at each receiving position,
Two-dimensional data having the position (x, y) as coordinates, or the position (x, y) and the reflection time t of the received signal as coordinates (x, y,
It is possible to easily generate the three-dimensional voxel data as t), and perform predetermined data processing on the two-dimensional data and the three-dimensional voxel data to obtain the processed two-dimensional data and the three-dimensional voxel data. Images can be displayed by two-dimensional display or three-dimensional display, which is convenient for data processing. The frequency of the wave signal is 100 MHz
The electromagnetic wave in the range from 1 GHz to 1 GHz,
Receives the reflected signal from the object existing in the medium
Then, when exploring an object in a concrete medium,
Distance between parallel lines or grids on the position confirmation sheet
Is preferably in the range of 1 cm to 10 cm.

Further, according to the second characteristic configuration, when the object has a longitudinal axis in a specific direction such as a reinforcing bar, for example, the estimated longitudinal axis of the object in the horizontal or vertical direction. for moving the exploration device in a direction inclined to the direction, earn range for radiating the object wave signal from the transmit portion, it is possible to obtain a reliable received signal. When an electromagnetic wave is used as a wave signal and an object such as a reinforcing bar having a small diameter is searched for, since there is anisotropy called the polarization characteristic of the electromagnetic wave, the plane of polarization is perpendicular to the longitudinal axis of the object. comes to, there is a problem that strength of the reflected wave returned to the receiving unit for the diameter of the object is small is not sufficient, inclined to locator relative to the longitudinal axis of the object being estimated as the present method By moving the, the plane of polarization set in the direction perpendicular to the normal moving direction can be tilted with respect to the radial direction of the reinforcing bar, and a reflected wave with sufficient intensity can be obtained. Further, for example, even if there are rod-shaped objects embedded in a medium at right angles to each other, such as rebars embedded in a lattice pattern, by moving the exploration device at an angle , the objects are embedded at a right angle. It is possible to search each other's rebars at one time, and the search time can be halved.

Further, according to the third characteristic configuration, the estimated angle of the object with respect to the longitudinal axis direction is 30 ° to 90 °.
By moving the exploration device in the direction of the range, even if the object having the longitudinal axis is a reinforcing bar having a small diameter, the exploration device is inclined at an angle of 30 ° or more with respect to the longitudinal axis direction of the reinforcing bar. As a result, the wave signal radiated from the transmitter is reflected by the object satisfactorily, and a highly reliable search result can be obtained. Further, when an object having a longitudinal axis is embedded in a grid, by moving the exploration device at an angle of 60 ° or less with respect to the estimated embedding direction of one of the grid-shaped objects, for example, the object is perpendicular to the object. Even for an object buried with a longitudinal axis in the direction, the movement direction of the exploration device can be set to 30 ° or less with respect to the longitudinal axis direction of the reinforcing bar, for example, embedded in a concrete wall in a grid pattern. Even if there are rod-shaped objects embedded at right angles to each other, such as rebars, it is possible to obtain strong reflection signals from all the rebars, and it is possible to satisfactorily explore the rebars embedded at right angles to each other. it can. Furthermore, the angle relative to the longitudinal axis of the object to be estimated of the equally spaced parallel lines 4
5 ° ± 5 ° is preferable, for example, when exploring reinforcing bars buried in a grid pattern, the exploration device can be tilted and moved at substantially the same angle with respect to the longitudinal axis direction of all the reinforcing bars, so that it is uniform. A favorable search result can be obtained.

Further, according to the fourth characteristic configuration, the exploration device can be moved in a direction inclined at an angle within the range of 30 ° to 60 ° with respect to the vertical direction, and the exploration device is embedded in concrete. When the vertical reinforcing bars and horizontal reinforcing bars form a grid, such as reinforcing bars, by moving the exploration device in this way, the vertical and horizontal reinforcing bars can be searched simultaneously, and the exploration time can be halved. Further, since the moving direction of the exploration device is 30 ° or more with respect to each rebar, a strong reflected wave can be obtained and the reliability of the received signal can be improved. Further, it is preferable that the angle of the parallel lines at equal intervals is 45 ° ± 5 ° with respect to the vertical direction. For example, when searching for reinforcing bars embedded in a grid pattern in the horizontal and vertical directions, Reinforcing bars can be searched uniformly.

Further, according to the fifth characteristic configuration,
By configuring the placement confirmation sheet with a transparent material,
The surface of the medium wall even when the position confirmation sheet is attached.
Can be observed.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION [Example 1] An embodiment of an exploration method according to the present invention (hereinafter, referred to as the present exploration method) will be described below. An example of exploring the concrete concealment pipe, which is the object, from the surface of the concrete wall will be described with reference to the drawings.

As shown in FIG. 1, when the concrete concealment pipe 2 buried in the concrete wall 1 is searched from the concrete wall surface 1a by using the present exploration method, the position confirmation sheet 3 is formed on the wall surface 1a. Is attached using an adhesive tape or the like, and while moving the small and lightweight exploration device 5 that can be operated with one hand along the position confirmation display 4 attached to the surface of the position confirmation sheet 3, the exploration is performed. a pulse signal caused by the electrostrictive <br/> wave in the range of from the device 5 for example frequency 100MHz in 1GHz radiated toward the wall 1, from the pipe 2 or the reinforcing rebar 1b existing in the wall 1 The reflected signal is received, and the received signal strength is sampled at every constant moving distance to generate received signal strength data.

The position confirmation sheet 3 used in the present exploration method has a vertical and horizontal dimension of 5 as shown in FIG.
Square or rectangular shape within the range of 0 cm to 150 cm , with a space of 1 cm to 10c on the surface
The parallel lines at equal intervals within the range of m are printed in a grid pattern (vertical and horizontal grid pattern) to form the position confirmation display 4.
The position confirmation sheet 3 is made of a transparent material, and the wall surface 1a can be observed even when the position confirmation sheet 3 is attached. In addition, the position confirmation sheet 3 used in the present embodiment is one in which the outermost peripheral dimension of the position confirmation display 4 is 140 cm × 60 cm, and the lattice spacing is 5 cm in accordance with the search range on the wall surface 1a described later. used.

The search device 5 used in the present search method comprises:
As shown in FIGS. 3 and 4, the vertical and horizontal heights of the external dimensions are approximately 20 cm × 15 cm × 10 cm, and a handle 6 that can be grasped and moved by one hand is provided. Further, wheels 7 are arranged at four corners. It is configured to go straight to. Further, a transmission antenna 8 for radiating the pulse signal and a reception antenna 9 for receiving the reflection signal are installed at the center of the bottom face in the longitudinal direction (traveling direction). Inside the exploration device 5, the transmitting unit 10 for generating a pulse signal transmitted from the transmitting antenna 8 and the reflected signal received by the receiving antenna 9 are demodulated and amplified, and if necessary, amplitude correction, waveform smoothing and A reception unit 11 that performs noise removal processing, and a reception signal processed by the reception unit 11 is sampled at every constant moving distance and A / D converted to generate received signal strength data for each constant moving distance. A data processing unit 12 for storing the received signal strength data as two-dimensional data having a moving distance x and a reflection time t of the reflection signal as coordinates (x, t);
A display unit 14 for displaying the two-dimensional data generated by the data processing unit 12 on a display screen 13 provided on the upper surface of the exploration device 5 in gradation, the transmission unit 10, the reception unit 11, and the data. An input operation unit 15 for operating the processing unit 12 and the like is provided.

FIG. 5 shows an example of two-dimensional image data displayed in gradation on the display screen 13. Here, in the gradation display, for example, when the signal intensity is positive, the higher the intensity is, the higher the brightness is, and when the signal intensity is negative, the lower the intensity is, the lower the brightness is, and the signal intensity 0 is displayed at the intermediate brightness. As shown in FIG. 5, a hyperbola with the moving distance x on the horizontal axis and the reflection time t on the vertical axis is displayed, and pipes, reinforcing bars, etc. may exist at the position (x, t) corresponding to the apex of each hyperbola. I understand. However, with such a two-dimensional image, it is not possible to three-dimensionally grasp the burial status of pipes and reinforcing bars. Therefore, it is necessary to extend the data generated by the data processing unit 12 to the position (x, y) on the wall surface 1a.

The concrete wall 1 in this embodiment
Is made for experiments, height 200 cm, width 1
It is 80 cm and 25 cm thick. In addition, as shown in FIG. 6, three pipes 2 having different diameters are separated from each other by 50 cm in the vertical direction (height direction) at a distance of 50 cm from the concrete wall surface 1a at the upper surface of each pipe 2 in the lateral direction (width direction). ) Is buried in. Further, two reinforcing rebars 1b are embedded in the wall 1 in the vertical direction at a distance of 14 cm from the back side at a distance of 20 cm in the horizontal direction. Hereinafter, for convenience of explanation,
The x direction is assigned to the horizontal direction and the y direction is assigned to the vertical direction.

Next, a method of scanning by the scanning device 5 along the lattice-shaped position confirmation display 4 of the position confirmation sheet 3 will be described. In this embodiment, FIG.
As shown in FIG. 3, a search range 16 of 140 cm in length and 60 cm in width that covers the three pipes 2 and the two reinforcing reinforcing bars 1b is set, and within the search range 16, the search device 5 is moved in the x direction. Then, the scanning was repeated 29 times in the y direction at 5 cm intervals. At this time, 29 pieces of the two-dimensional data having the coordinates (x, t) generated by the data processing unit 12 of the exploration device 5 are converted into a three-dimensional data processing unit (FIG. (Not shown) via a predetermined communication path, and the three-dimensional data processing unit has a position (x, y) on the wall surface 1a and a reflection time t as coordinates (x, y, t) in the three-dimensional data processing unit. Generate voxel data. Here, the y-coordinate value is specified by the order of the original two-dimensional data, and the x-coordinate value is the same as the x-coordinate value of the two-dimensional data.

The three-dimensional data processing unit embeds the (x, t) cross-section data of each y-coordinate value in the three-dimensional voxel data, executes a predetermined interpolation process, etc., and then performs a three-dimensional synthetic aperture process or a three-dimensional process. Performs migration processing and the like. The obtained three-dimensional processing result is shown in FIG. In FIG. 7, the z direction is the thickness direction of the concrete wall 1.
Further, a specific data processing method for obtaining the three-dimensional processing result shown in FIG. 7 from the three-dimensional voxel data is not the gist of the present invention, and therefore the description thereof will be omitted.

Example 2 Another embodiment of the exploration method according to the present invention will be described below in which a reinforcing rod having a diameter of 6 mm, which is an exploration target, is embedded in a concrete wall that is a exploration target medium. An embodiment in which the surface is searched will be described with reference to the drawings.

As shown in FIG. 8, by using the present exploration method, the reinforcing bars 21a are embedded in the concrete wall 1 in a grid pattern and have the longitudinal axis in the vertical direction and the longitudinal bar in the horizontal direction. Position confirmation sheet 2 with parallel lines at equal intervals when exploring the concrete wall surface 1a
3 is attached using an adhesive tape or the like so that the parallel line is about 45 ° with respect to the vertical direction. The detailed structure of the exploration device 5 is omitted because it is similar to that of the above-described first embodiment, but the exploration device 5 is used for the position confirmation display 2 described above.
While moving along parallel lines of 4, the frequency for example from locator 5 is a pulse signal emitted toward the inside of the wall 1 by electromagnetic <br/> waves in the range from 100MHz to 1 GHz, it is present in the wall 1 receiving a reflected signal from the rebar 21a and rebar 2 1 b, and is configured to generate a received signal strength data is sampled every predetermined travel distance and the received signal strength.

The above-mentioned position confirmation sheet 23 is shown in FIG.
As shown in (a), it has a square shape, and parallel lines are printed on the surface at equal intervals to form a position confirmation display 24. The position confirmation sheet 23 is, as described above,
The parallel line of the position confirmation display 24 is 45 ° with respect to the vertical direction.
Since it is attached to the concrete wall surface 1a so as to be approximately, the direction of the parallel line of the position confirmation display 4 is, after all, the rebar 2
An angle of about 45 ° is formed with respect to the longitudinal axis directions of 1a and 21b, and by moving the exploration device on this parallel line,
The search will be performed in a direction having an angle of about 45 ° with respect to the axial direction of the reinforcing bar. In addition, in order to mount the position confirmation sheet 23 in an inclined manner in this manner, the vertical direction is obtained in advance by using a weight or the like, and the parallel line of the position confirmation display 24 is 45 ° with respect to the obtained vertical direction. Although it is accurate to wear it so that it will be, even if the person wears it while visually confirming it, there is no problem because it fits within the error range of about ± 5 ° and falls within the search error range.

Next, a method of scanning by the scanning device 5 along the lattice-shaped position confirmation display 4 of the position confirmation sheet 23 will be described. In this embodiment, along the position confirming display 24 of the position confirmation sheet 23 shown in FIG. 9 (b), scanning the locator 5 in the x-direction, it was repeated at regular intervals such scanning in the y-direction . Further, the exploration device 5 emits a pulse signal of an electromagnetic wave toward the inside of the wall 1, and the polarization plane of the radiated electromagnetic wave is a direction perpendicular to the moving direction of the exploration device 5, a so-called y-axis direction. ing.

9A and 9B show the exploration results in which the signal intensity generated at this time with respect to the reflection time t of the position where the reinforcing bar is assumed to exist is expanded to the coordinates (x, y) and displayed in gradation.
Shown in (b). In the search by electromagnetic waves having such a plane of polarization, for example, when searching for a reinforcing bar having a small diameter as in the present embodiment, when the polarization plane is in the radial direction of the reinforcing bar, the intensity of the reflected signal is sufficient for subsequent data processing. Alternatively, it may not be possible to explore the rebar. However, according to this method, since the exploration device 5 is scanned in the direction of 45 ° with respect to the axial direction of the reinforcing bar, the plane of polarization does not become the radial direction of the reinforcing bar, and the radiated electromagnetic wave is reliably transmitted. As can be seen from FIG. 9B, both the reinforcing bars 21a and 21b arranged in a grid pattern can be simultaneously searched by scanning the searching device 5 in the x-axis direction. it can.

Next, as a comparative example, as shown in FIG. 10A, the parallel line of the position confirmation display 24 of the position confirmation sheet 23 is attached to the concrete wall surface 1a in the vertical direction, and the exploration device is installed. In the case of scanning, and as shown in FIG. 11A, when the parallel lines of the position confirmation display 24 of the position confirmation sheet 23 are set horizontally to the concrete wall surface 1a, and the scanning device is scanned, The result of generating the exploration result of gradation display by expanding each signal intensity to the coordinates (x, y) will be described. As shown in FIG. 10 (b), locator 5 in the vertical direction, i.e., when scanning parallel to the longitudinal axis which is estimated rebar 21a, coincides with the radial direction of the polarization plane thin reinforcing bars 21a of an electromagnetic wave radiated Therefore, electromagnetic waves are hardly reflected by the reinforcing bar 21a, and as a result, as shown in FIG.
Cannot be explored. Further, as shown in FIG. 11 (b), locator 5 in the horizontal direction, i.e., when scanning parallel to the longitudinal axis which is estimated rebar 21b, radially thin reinforcing bar 21b is polarization of an electromagnetic wave radiated since matching the electromagnetic waves hardly reflected by rebar 21b, result, as shown in FIG. 1 1 (b), horizontal rebar 21b
Cannot be explored. Therefore, in order to search all of the grid-shaped reinforcing bars, it is necessary to perform both vertical and horizontal search, which is twice as much as the case of searching diagonally to the vertical direction described above. It turns out that it takes time.

Another embodiment will be described below. <1> flat row lines and the patterns of the position confirmation sheet 3 is not displayed by a solid line, but may be a broken line or dotted line. Also ,
Etc. In the case in some exploration target medium surface can not be transmitted and received pulse signal, before exploration starts, correction of the position confirming display 4 or separately formed specially the upper position confirmation sheet 3 I don't mind. Also, the position confirmation sheet 3
Does not necessarily have to be made of a transparent material. Further, the fixing of the position confirmation sheet 3 on the medium surface is not necessarily limited to the method of the above embodiment, and an appropriate fixing method may be selected according to the state of the medium surface.

<2> The exploration device 5 is not necessarily limited to the above embodiment. For example, the display screen 13 and the display unit 14 are not provided, and the two-dimensional data generated by the data processing unit 12 and having the moving distance x and the reflection time t as coordinates (x, t) are the external three-dimensional data. It may be configured to have a function of transferring to the data processing unit.

< 3 > When the search device 5 is moved along the position confirmation display 4 on the position confirmation sheet 3, the position of the transmitting antenna 8 and the receiving antenna 9 of the search device 5 is confirmed by the position confirmation. Basically, the display is moved so as to pass over the display 4. However, the transmitting antenna 8
If the positioning is difficult because the receiving antenna 9 and the receiving antenna 9 are installed on the bottom surface of the exploration device 5, one of the wheels 7 is designated for positioning, and the designated wheel is used for the position confirmation. The exploration device 5 so as to pass over the display 4.
May be moved. In this case, based on the relative positional relationship between the designated wheel and the midpoint of the transmitting antenna 8 and the receiving antenna 9, the position coordinates (x,
y) may be converted into the coordinates of the true transmission / reception position.

< 4 > In Example 2 described above, the angle between the parallel line of the position confirmation display of the position confirmation sheet 23 and the vertical direction is changed from 0 ° to 90 °, and the longitudinal axis is in the vertical direction. FIG. 12 shows the results of obtaining the reflected wave strength a of the reinforcing bar 21a and the reflected wave strength b of the reinforcing bar 21b having the longitudinal axis in the horizontal direction. As shown in FIG. 12, the polarization plane of the electromagnetic wave radiated from the exploration device is perpendicular to the scanning direction of the exploration device. Therefore, when the scanning direction is perpendicular to the axial direction of the reinforcing bar, this polarization plane is In the longitudinal direction,
It is possible to receive a reflected wave of sufficient strength from the reinforcing bar. However, when the intensity of the reflected wave when the scanning direction is perpendicular to the axial direction of the reinforcing bar is 1, and when the scanning direction of the exploration device and the longitudinal axis direction of the reinforcing bar coincide, the plane of polarization is the radial direction of the reinforcing bar. In agreement, the intensity of the reflected wave from the reinforcing bar becomes about 0.1, and it becomes impossible to receive the reflected wave and search the reinforcing bar. Further, the strength required for exploring the reinforcing bars is about 0.5, and as can be seen from FIG. 12, it is possible to perform the exploring when the angle between the scanning direction and the longitudinal axis direction of the reinforcing bars is 30 ° or more. Therefore, in order to keep the angle between all the reinforcing bars arranged in a grid pattern in the vertical direction and the horizontal direction and the scanning direction at 30 ° or more, the scanning direction, that is, the parallel line of the position confirmation display is set in the vertical direction. From 30 ° to 60 °
It is possible to cope by setting it within the range of.

< 5 > In the above-described second embodiment, the position confirmation sheet 23 is mounted with the parallel lines of the position confirmation display 24 tilted at an angle of 45 ° with respect to the vertical direction.
Although the configuration for simultaneously exploring 1b has been described, this shows a preferred form when the reinforcing bars are embedded in a grid pattern in the vertical direction and the horizontal direction. For example, when the longitudinal axis direction of the reinforcing bars can be estimated. In, the parallel line of the position confirmation display is changed from 30 ° to 6 ° with respect to the estimated longitudinal axis direction of the reinforcing bar.
It can be installed by tilting within the range of 0 °.

< 6 > In the above embodiment, the reinforcing bars and the pipes are the objects to be searched. However, as the objects to be searched, a long structural steel made of metal having a longitudinal axis is used as a pillar or a pillar. When embedded as a beam, it is particularly effective to incline the parallel lines of the position confirmation display provided on the position confirmation sheet with respect to the longitudinal axis direction of the structure.

< 7 > In the second embodiment, the position confirming sheet 23 is mounted with the parallel lines of the position confirming display 24 inclined with respect to the vertical direction, and the reinforcing bars 21 embedded in a lattice form.
Although a configuration is shown in which the a and the reinforcing bar 21b are radiated, and the polarization plane of the radiated electromagnetic wave and the longitudinal axis direction of the reinforcing bar are not perpendicular to each other, the transmitting antenna 8 of the exploration device 5 is separately provided. 45 with respect to the scanning direction of the exploration device
It may be installed diagonally so that it becomes °, in this case,
The position confirmation sheet 23 is shown in FIG.
As shown in (a), even if the parallel lines are mounted so as to be vertical or horizontal, and the scanning device 5 is scanned along the parallel lines, the polarization plane of the radiated electromagnetic waves and the longitudinal axis direction of the reinforcing bar are A reflected wave having a sufficient intensity can be obtained without being vertical.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a situation in which an exploration is being performed by an exploration method according to the present invention.

FIG. 2 is an explanatory view showing an example of a position confirmation display of a position confirmation sheet used in the exploration method according to the present invention.

FIG. 3 is a perspective view showing an exploration device.

FIG. 4 is a block diagram of the exploration device.

FIG. 5 is a diagram showing a display example of two-dimensional image data displayed in gradation on a display screen attached to the exploration device.

FIG. 6 is a front view (a) and a side view (b) showing the arrangement of the concealed concrete pipe buried in the concrete wall and the reinforcing bar.

FIG. 7 is a diagram showing a display example of a three-dimensional processing result for the concrete concealing pipe and the reinforcing bar shown in FIG.

FIG. 8 is an explanatory diagram showing a situation in which an exploration is being performed by the exploration method according to the present invention.

FIG. 9 is an explanatory diagram (a) showing a mounted state of the position confirmation sheet according to the second embodiment of the present invention and an exploration result (b) at that time.

FIG. 10 is an explanatory view (a) showing a mounted state of the position confirmation sheet in a comparative example and an exploration result (b) at that time.

FIG. 11 is an explanatory view (a) showing a mounting state of a position confirmation sheet in a comparative example and an exploration result (b) at that time.

FIG. 12 is a graph showing the relationship between the angle between the vertical direction and the scanning direction and the intensity of the reflected wave from the reinforcing bar.

[Explanation of symbols]

1 Concrete wall (medium) 1a Concrete wall surface (medium surface) 1b Reinforcing reinforcing bar (object) 2 Concrete concealment piping (object) 3 Position confirmation sheet 4 Position confirmation display 5 exploration equipment 6 handles 7 wheels 8 transmitting antenna 9 receiving antenna 10 Transmitter 11 Receiver 12 Data processing unit 13 Display screen 14 Display 15 Input operation section 16 exploration range

─────────────────────────────────────────────────── --Continued from the front page (56) Reference JP-A-4-38494 (JP, A) JP-A-8-240667 (JP, A) JP-A-4-38492 (JP, A) JP-A-6- 102359 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01V 3/12 G01S 13/88

Claims (6)

(57) [Claims] 1. An electromagnetic wave having a frequency in the range of 100 MHz to 1 GHz while moving on the surface of a concrete medium.
A wave signal by the wave emitted from the transmitting unit to the concrete medium, receives the reflection signal from the object present in said concrete medium at the receiving unit, a plurality of positions (x on the concrete medium surface, y ) a search method for probing the position of the object based on the signal strength of the received signals received for reflection time t, as corresponding to the position on the concrete medium surface (x, y), The position confirmation sheet is placed on the concrete medium surface, and the 1 cm to 10 cm
A search method characterized by moving the transmitting unit and the receiving unit along a position confirmation display, which is a parallel line or a grid at equal intervals in a range, and performs the search. If wherein objects in said medium having a longitudinal axis in a specific direction, claim 1 of the parallel lines of the equal intervals, to dispose inclined with respect to the longitudinal axis of the object to be estimated The exploration method described in. 3. The exploration method according to claim 2 , wherein the angles of the parallel lines at equal intervals with respect to the estimated longitudinal axis direction of the object are in the range of 30 ° to 90 °. 4. The exploration method according to claim 1 , wherein the parallel lines at equal intervals are arranged so as to be inclined at an angle within the range of 30 ° to 60 ° with respect to the vertical direction. 5. The position confirmation sheet is made of a transparent material.
Exploration according to any one of claims 1 to 4
Method. 6. A position confirmation sheet which is used as the position confirmation sheet of the exploration method according to claim 1 and is provided with the position confirmation display.