JP2002250719A - Equipment for inspecting architectural structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an equipment for inspecting an architectural structure provided with a contactor movable smoothly on a wall face to be inspected with no resistance. SOLUTION: The equipment for inspecting an architectural structure comprises a shaking contactor for converting an electric signal into a mechanical vibration being imparted to the architectural structure and a receiving contactor for converting a mechanical vibration generated from the architectural structure into an electric signal, disposed in a detector body incorporating a signal processing circuit, wherein the shaking contactor 5 and the receiving contactor 6 are provided, respective, with a rolling member comprising a ball 12 or a roller 13 at a part touching the architectural structure 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building structure inspection apparatus for non-destructively detecting a defect in a concrete of a building or a peeling or a defect of a tile used on a wall, and more particularly to an apparatus for contacting a building structure. The present invention relates to an improvement of a contact for recirculation and reception.

[0002]

2. Description of the Related Art Hitherto, various inspection means have been proposed for predicting in advance concrete defects in building structures and peeling and falling of tiles used on wall surfaces. For example, Japanese Unexamined Patent Publication No. 7-20926 discloses a method of hitting an object to be inspected with a hammer, converting the hitting sound at that time into a digital signal, and analyzing the digital signal with a computer. That is, the object to be inspected is hit with a hammer or other hitting means, and a crest factor is calculated from the reflected sound obtained at that time. When the crest factor is equal to or greater than a first predetermined value, the object to be inspected is determined to be sound. When the crest factor is less than the first predetermined value, the expected frequency is calculated from the reflected sound. When the deviation between the expected frequency and the expected frequency of the sound inspection object is smaller than the second predetermined value, the inspection object Is determined to be sound, and when the deviation is equal to or greater than the second predetermined value, the object to be inspected is determined to be defective.

[0003] Japanese Patent Application Laid-Open No. 2000-131290 discloses a method of analyzing the frequency of an impact sound using a plurality of bandpass filters. In other words, the external force when an external force is applied to the inspected object with a hammer to generate a striking sound is detected by the excitation force sensor, and the ratio between the result and the external force reference value is obtained. The generated impact sound is detected by a microphone, and the result is separated into time-series signals for each frequency by a band-pass filter, further rectified, and a peak hold is used to extract an instantaneous maximum value in each frequency band. The maximum value is corrected based on the previously calculated ratio, and a comparison result signal is output when the value deviates from a predetermined relationship by comparing with a preset vibration reference value in the comparator,
The alarm issues an alarm when the number of comparison result signals is, for example, three or more. That is, the maximum value of the time-series signal for each of a plurality of frequency bands is extracted and compared.

[0004]

However, the prior art as described above has the following problems. That is, in the sensory evaluation in which the inspector hits the tile surface with a hammer or the like and determines the difference of the hitting sound at that time, as in the technique of Japanese Patent Application Laid-Open No. 7-20926, the quantitative evaluation is performed based on the individual differences and skills of the inspector. Judgment was difficult, and the accuracy and reproducibility were incomplete.

There have been some attempts to mechanically and electrically process this determination.
Expensive measuring instruments were required. For example, JP-A-7-2092
In the method disclosed in Japanese Patent Application Publication No. 62-62, an apparatus and a computer for hitting a tile to be inspected with a hammer and processing the hitting sound with a computer are required. In the method disclosed in Japanese Patent Application Laid-Open No. 2000-131290, the structure is complicated because a plurality of band-pass filters are prepared for analyzing the frequency. In addition, since the hammering sound is collected by the microphone, accurate measurement cannot be performed if there is another noise source that causes noise.

[0006] Further, even in the case where an oscillation probe and a reception probe of a non-destructive inspection device having an excitation probe and a reception probe are brought into contact with a wall to be inspected, inspection is performed. However, there were the following problems. That is, when the vibrating probe and the receiving contact are moved in contact with the inspected wall for inspection, the frictional resistance between the contact and the inspected wall is large, so that the inspected wall may be damaged. (Especially for tiles),
There has been a problem that the tip of the probe is worn or that an unpleasant friction sound is generated. The present invention has been made in order to solve the above-described problems, and has as its object to provide a building structure inspection apparatus including a contact that can move smoothly without resistance on a wall surface to be inspected.

[0007]

In order to achieve the above object, a building structure inspection apparatus according to the present invention converts an electric signal into a mechanical vibration in a detector body incorporating a signal processing circuit. In a building structure inspection device provided with a vibrating contact for applying to an object and a receiving contact for converting mechanical vibration generated in the building structure into an electric signal, The contact element and the receiving contact element are characterized in that a rolling member is provided at a portion in contact with the building structure.

According to the building structure inspection apparatus of the present invention, when the vibrating contact and the receiving contact are brought into contact with the inspected wall surface of the building structure and moved, the rolling member rolls on the wall surface. In addition, since it can be moved lightly with a small frictional force, workability is improved, and the wall surface is not scratched by the wall surface, and no unpleasant friction noise is generated.

The rolling member of the contact of the building structure inspection apparatus according to the present invention may be a ball. With this configuration, the inspection can be performed by moving the ball in any direction while keeping the ball in contact with the wall surface to be inspected.

[0010] Further, the rolling member of the contact of the building structure inspection apparatus according to the present invention may be a roller. With this configuration, a large contact area with the wall surface can be obtained, and thus, when the inspected wall surface has a large area, work efficiency is improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a building structure inspection apparatus according to the present invention will be described below in detail with reference to the drawings. Figure 1
1 is a block diagram illustrating a configuration example of a signal processing circuit of a building structure inspection device of the present invention. This building structure inspection apparatus includes an oscillator 1, first and second amplifiers 2 and 3, a multiplier 4, a vibrating contact 5, a receiving contact, and a low-pass filter 7. ing. The vibrating contact 5 converts an electric signal into mechanical vibration, and is composed of, for example, a piezoelectric speaker. The receiving contact 6 converts mechanical vibration into an electric signal, and is composed of, for example, a piezoelectric element.

While the vibrating contact 5 and the receiving contact 6 are in contact with the wall 8 to be inspected, such as a tile or a concrete structure, for example, a sine wave signal is generated by the oscillator 1, and the sine wave signal is generated by the amplifier 2. The signal is amplified and output as an excitation signal Vr. The excitation signal Vr is applied to the excitation contact 5, and the vibration of the excitation contact 5 causes the wall surface 8 to be inspected of the building structure to vibrate. This vibration is received by the receiving contact 6, converted into an electric signal, amplified by the amplifier 3, and output as a received signal Vi. The two signals Vr and Vi are multiplied by a multiplier 4 and passed through a low-pass filter 7 to obtain a judgment output voltage V0. The determination output voltage V0 is a signal that reflects the amplitude and phase of the received signal with respect to the frequency change of the excitation signal. Therefore, the judgment output voltage V0 indicates the frequency characteristic of the wall surface 8 to be inspected. Since the normal wall surface and the abnormal wall surface have different frequency characteristics, an abnormal wall surface such as a peeled tile can be distinguished.

FIG. 2 is a diagram showing a waveform of a judgment output voltage V0 of a normal tile and a tile having a peeled portion,
(A) is an output voltage waveform in a normal tile,
(B) is an output voltage waveform in a tile having a peeled portion. Normal tiles are completely in contact with the building, so the excited energy is absorbed and does not return much to the receiving side, but the tiles that have peeled off are only partially in contact with the structure The exfoliated portion does not absorb the excited energy, and the frequency characteristics of the vibration of the tile itself can be observed. Therefore, it is possible to determine the separation of the tile by observing the difference in the frequency characteristics appearing in the output voltage Vo.

FIGS. 3 to 8 show an embodiment of the present invention, in which the above-mentioned vibrating contact 5 and receiving contact 6 are described.
Is shown. FIG. 3 shows a vibrating contact 5 and a receiving contact 6 according to the first embodiment, and a detector main body 10 in which the signal processing circuit shown in FIG. A contact 5 for a vibrator, such as a piezoelectric speaker, and a receiving contact 6, such as a piezoelectric element, provided on one side of the device. As shown in FIG. 4, the outer shape of the vibrating contact 5 (the same applies to the receiving contact 6) has a conical shape, and a ball 12 is rotatably attached to a tip (a vertex of the cone). More than half of the surface of the ball 12 is buried in the vibrating contact 5 so that it can rotate in an arbitrary direction without falling off like the tip of a ballpoint pen. With this structure, the detector body 10 can perform inspection by moving the ball 12 of the vibrating contact 5 and the receiving contact 6 in any direction while keeping the ball 12 in contact with the wall surface 8 to be inspected.

As described above, according to the present embodiment, the ball 1 is attached to the contact portion between the vibrating contact 5 and the receiving contact 6.
When the contact 5 for the shaker and the contact 6 for the vibrator are moved on the wall 8 to be inspected of the building structure because the ball 2 is provided, the ball 12 rolls on the wall and can be moved lightly. In addition to the improvement, it is possible to prevent the wall surface (especially in the case of a tile) from being scratched by the wall surface and generating an unpleasant friction sound.

FIG. 5 shows a second embodiment of the present invention, in which a vibrating contact 5 (the same is true for a receiving contact 6) has a triangular prism shape oriented parallel to the detector main body 10. Instead of a ball, a thin roller 13 is rotatably mounted on the vertex.

FIG. 7 shows a third embodiment of the present invention. A vibrating contact 5 (similar to the receiving contact 6) is provided with a rib-shaped protrusion 5a at the tip thereof. The roller 13 is rotatably attached to the tip of the portion 5a.
As described above, in the second and third embodiments, since the rollers 13 are provided on the vibrating and receiving contacts 5a and 6a, the same effects as those of the first embodiment can be obtained. Since the contact area with the wall surface is larger than that of the ball 12, the work efficiency is improved when the inspected wall surface 8 has a large area.

[0018]

As described above, according to the present invention,
Rolling members are provided for the vibrating and receiving contacts, so when the contact is moved by contacting the wall to be inspected, the ball rolls on the wall and can be moved lightly with small frictional force. As a result, it is possible to prevent the wall surface from being scratched by the wall surface and unpleasant friction noise from being generated. Further, by using a ball as the rolling member, the ball can be moved in an arbitrary direction while being in contact with the wall surface to be inspected, and inspection can be performed.

Further, since the rolling member is a roller, a large contact area with the wall surface can be obtained, so that when the wall surface to be inspected has a large area, work efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a circuit configuration of a building structure inspection apparatus according to the present invention.

2A and 2B are diagrams illustrating an example of a measurement result obtained by the building structure inspection apparatus in FIG. 1, wherein FIG. 2A is an output voltage waveform diagram of a normal tile, and FIG. 2B is an output voltage waveform diagram of a tile having a peeled portion; It is.

3A and 3B show a first embodiment of a building structure inspection apparatus of the present invention, wherein FIG. 3A is a side view and FIG. 3B is a front view.

FIG. 4 is a partially cutaway side view showing the vibration contactor in an enlarged manner.

FIG. 5 is a side view showing a second embodiment of the building structure inspection apparatus of the present invention.

FIG. 6 is a partially cutaway front view of the second embodiment.

FIG. 7 is a side view showing a third embodiment of the building structure inspection apparatus of the present invention.

FIG. 8 is a partially cutaway front view of the third embodiment.

[Explanation of symbols]

 5 Contact for vibration 6 Contact for reception 8 Wall surface to be inspected 10 Detector body 12 Ball (rolling member) 13 Roller (rolling member)

Claims (3)

[Claims] 1. A vibrating contact for converting an electric signal into mechanical vibration and applying it to a building structure, and a mechanical vibration generated in the building structure. In the building structure inspection device provided with a receiving contact for converting the electrical signal into an electrical signal, the vibrating contact and the receiving contact, a rolling member in a portion that contacts the building structure An inspection device for a building structure, which is provided. 2. The building structure inspection apparatus according to claim 1, wherein said rolling member is a ball. 3. The building structure according to claim 1, wherein said rolling member is a roller.