JP5635715B1 - Structure inspection tool - Google Patents

Abstract

An inspection tool such as a structure having good detection accuracy is provided. An inspection tool includes a contact member that slides on a surface of a structure, a support body that the contact member is indirectly installed and supported, and a vibration that is installed on the support body and includes sound waves. A first microphone unit for detecting noise, and a second microphone unit that is installed in parallel in the vicinity of the first microphone unit and detects vibration while suppressing detection of sound waves, and the first microphone The unit and the second microphone unit are installed between the sound collection unit 40 in which the respective sound collection units are arranged in the same direction or in the opposite direction, and between the contact member 20 and the support body 10, and are elastic. A deformable buffer member 30; and an arithmetic unit for adding or subtracting the output signal of the second microphone unit from the output signal of the first microphone unit so as to cancel the output signal. That. [Selection] Figure 1

Description

  The present invention relates to a structure inspection tool.

  If a tile, mortar, concrete, etc. that forms the outer wall or floor of a building is peeled, deteriorated, expanded, mixed with air or foreign matter, a serious accident may be induced. In order to prevent accidents, the building is regularly inspected for exfoliation and deterioration.

  Generally, this inspection is a sensory evaluation, and a person hits the surface of the structure with an inspection hammer, and distinguishes between a healthy part and an unhealthy part based on the difference in the hitting sound. However, because it is difficult to detect a wide range of unhealthy parts because it is judged from the difference in the hitting sound between adjacent hitting parts, and because it is a sensory evaluation, there are variations in discrimination depending on the person performing the inspection, and quantitative data does not remain There was a problem that the deterioration over time could not be grasped. For this reason, there is a demand for a method for inspecting peeling, deterioration, etc. of a structure without destruction based on quantitative data.

  As an inspection tool inspected nondestructively, for example, there is an inspection tool disclosed in Patent Document 1. This inspection tool is rotatably supported by a support part and rolls while contacting a surface of a structure or the like, and a rolling element generated when the rolling element is rolled on the surface of an inspection object. A microphone for detecting a hitting sound is provided, and a sound part and an unhealthy part are discriminated based on a rolling sound detected by the microphone.

JP 2007-132720 A

  A microphone is a device that converts sound into an electric signal by vibrating a diaphragm provided in the inside. However, in the inspection tool of Patent Document 1, the microphone has conducted not only the rolling sound but also the support portion. Since the vibration at the time of rolling is also detected, the detection accuracy of the unhealthy part of the structure is lowered.

  The present invention has been made in view of the above matters, and an object of the present invention is to provide an inspection tool such as a structure having good detection accuracy.

The structural inspection tool according to the present invention is:
A contact member that slides on the surface of the structure;
A support body on which the contact member is indirectly installed and supported;
The installed on a support, a first microphone unit for detecting vibrations including ultrasonic, said installed in parallel in proximity to the first microphone unit, a second detecting vibration wave detected is suppressed A microphone unit, and the first microphone unit and the second microphone unit are arranged so that the respective sound collectors face the same direction or the opposite direction; and
A shock-absorbing member that is installed between the contact member and the support and is elastically deformable;
An arithmetic device for adding or subtracting the output signal of the second microphone unit from the output signal of the first microphone unit so as to cancel the output signal ;
The buffer member that is formed of silicone rubber,
It is characterized by that.

  Moreover, it is preferable that the first microphone unit and the second microphone unit are installed on the support via a vibration absorbing member.

In addition, the first microphone unit and the second microphone unit are arranged with their respective sound collection parts directed toward the contact member,
The sound collecting unit of the first microphone unit is opened, and the sound collecting unit of the second microphone unit is closed;
The arithmetic unit preferably subtracts the output signal of the second microphone unit from the output signal of the first microphone unit.

  With the structural inspection tool according to the present invention, it is possible to accurately detect an unhealthy part such as deterioration or peeling of the structural body.

It is a perspective view of an inspection tool. It is a top view of an inspection tool. It is an internal structure figure of a sound collection unit. It is a figure explaining the inspection work situation, such as deterioration of a wall, using an inspection tool. It is a photograph of the inspection tool provided with the buffer member used for the Example. It is the photograph of the tile for outer walls which is not deteriorated used for the Example. It is a photograph of the deteriorated exterior wall tile used in the examples. It is a photograph of the inspection tool which is not provided with the buffer member used for the Example. It is a graph (Drawing 9 (A)) which shows output data of a healthy part detected using an inspection tool provided with a buffer member in an example (Drawing 9 (B)) which shows output data of an unhealthy part. It is a graph (Drawing 10 (A)) which shows output data of a healthy part detected using an inspection tool which is not provided with a buffer member in an example (Drawing 10 (B)) which shows output data of an unhealthy part. .

  The inspection tool 1 according to this embodiment is used to check whether tiles, mortar, concrete, and the like that form the outer walls and floors of the structure are not peeled, deteriorated, expanded, mixed with air or foreign matter. Used. As shown in FIGS. 1 and 2, the inspection tool 1 includes a support 10, a contact member 20, a buffer member 30, a sound collection unit 40, and a vibration absorbing member 50.

  The support 10 supports the contact member 20, the buffer member 30, and the sound collection unit 40. The support 10 also serves as a grip that the person to inspect has. The support 10 is composed of a hard rod-like body such as metal or a tubular body.

  The contact member 20 is connected to the support 10 by a buffer member 30. Further, the buffer member 30 and the contact member 20 are connected via the connecting member 11. The contact member 20 is a member that slides on the surface of a structure that is a subject, and is made of a hard material such as metal or ceramics. The contact member 20 is preferably a sphere or an ellipsoid.

  The buffer member 30 is made of an elastically deformable member such as silicone rubber. The buffer member 30 maintains a constant contact pressure when the contact member 20 slides on the surface of the structure due to elastic deformation, and absorbs variation in force applied when the inspection tool 1 is operated. The buffer member 30 further has a function of reducing vibration during sliding that occurs in the contact member 20 conducted to the support 10.

  The sound collection unit 40 is installed on the support 10 via the vibration absorbing member 50. The vibration absorbing member 50 is made of a material having vibration absorption such as sponge or rubber. The vibration absorbing member 50 has a function of absorbing vibration conducted to the sound collecting unit 40 via the support 10.

  The sound collection unit 40 includes two microphone units 41 and 42 and an arithmetic device 43 inside. The microphone unit 41 includes a diaphragm 41a and a sound collecting unit 41b for transmitting air vibration to the diaphragm 41a. The microphone unit 42 has a similar structure, and includes a diaphragm 42a and a sound collection unit 42b.

  The sound collecting portion 41b of the microphone unit 41 is provided with an opening 41c toward the contact member 20, and is configured to detect sound waves generated when the contact member 20 slides on the surface of the structure. However, the microphone unit 41 also detects vibrations conducted through the support 10 as a secondary matter.

  On the other hand, the sound collecting portion 42b of the microphone unit 42 is sealed, and does not detect sound waves generated when the contact member 20 slides on the surface of the structure. In other words, the microphone unit 42 is configured to detect only vibration conducted through the support 10.

  The microphone unit 41 and the microphone unit 42 are arranged close to each other in parallel, and face the same direction as the longitudinal direction of the support 10. Thereby, the microphone units 41 and 42 similarly detect the vibration conducted to the sound collection unit 40 via the support body 10 including the frequency, amplitude and phase.

  Note that if the microphone unit 41 senses vibration including sound waves and the microphone unit 42 has a function to be insensitive to sound waves, it is not necessary to adopt a configuration such as opening or sealing.

  The microphone units 41 and 42 and the arithmetic device 43 are electrically connected. Signals related to the frequency and amplitude detected by the microphone units 41 and 42 are output to the arithmetic unit 43.

  The arithmetic device 43 subtracts the signal input from the microphone unit 42 from the signal input from the microphone unit 41 and outputs the result. As a result, the output signal of the arithmetic device 43 has only the component of the sound wave generated when the component related to vibration is removed and the contact member 20 slides on the surface of the structure.

  The sound collection unit 40 is configured to be able to communicate with an external personal computer or the like by a wired or wireless communication mechanism (not shown). Then, the signal of the sound wave component extracted by the arithmetic unit 43 is output to an external personal computer or the like, and the signal is observed on the monitor.

  Then, the inspection method using the inspection tool 1 mentioned above is demonstrated. 4, the inspector holds the support 10 of the inspection tool 1 and presses the contact member 20 against the wall Wa so that the contact member 20 slides on the wall Wa. Move along. Due to the elastic deformation of the buffer member 30, the contact member 20 slides on the surface of the wall Wa while maintaining a constant contact pressure with respect to the wall Wa according to the unevenness of the wall Wa.

  Since the contact member 20 slides on the wall Wa with the unevenness, sound waves and vibrations are generated by friction and minute impact. Among these, the sound wave is detected by the microphone unit 41 from the opening 41 c of the sound collection unit 40. On the other hand, since the microphone unit 42 has no opening, no sound wave is detected.

  The microphone units 41 and 42 also detect vibrations conducted through the support 10 respectively. The contact member 20 is connected to the support body 10 by a buffer member 30. Further, although the sound collecting unit 40 is installed on the support body 10 via the vibration absorbing member 50, the contact member 20 slides on the wall Wa. The vibration absorbing member 50 is not completely absorbed by the vibration absorbing member 50, and the sound collecting unit 40 is moved with the movement of the support 10, so that slight vibration is generated. 42.

  In this manner, the addition signal of the sound wave and vibration detected by the microphone unit 41 and the vibration signal detected by the microphone 42 are input to the arithmetic device 43. The arithmetic device 43 subtracts the signal input from the microphone unit 42 from the signal input from the microphone unit 41. Thereby, only the component of the sound wave detected by the microphone unit 41 is extracted.

  As shown in the examples to be described later, from the data of the inspection tool 1 according to the above-described form, for the wall Wa or the like that has not deteriorated, the component of the low frequency band does not appear in the extracted sound wave component, and the deterioration or the like In the generated wall Wa or the like, the amplitude of the sound wave increases in the entire frequency band, and a component in the low frequency band appears. For this reason, the healthy part and the unhealthy part can be discriminated by paying attention to the amplitude of the sound wave and the low frequency band component.

  In addition, a threshold is set for the frequency, and when a frequency lower than the threshold is detected, a determination unit that determines that the structure has deteriorated, and further, it is determined that deterioration has occurred. In this case, an informing unit for informing by video or sound may be provided. These discrimination | determination part and alerting | reporting part may be attached to the inspection tool 1, and may be installed in the personal computer etc. which were connected outside.

  In the above configuration, the microphone units 41 and 42 are arranged in the same direction, but the microphone unit 42 may be arranged in the opposite direction. In this case, the arithmetic device 43 is configured to add the signal detected by the microphone unit 41 and the signal detected by the microphone unit 42 to cancel the vibration component detected via the support 10.

  An inspection tool in which a buffer member 30 was installed between the support 10 and the contact member 20 shown in FIG. A conical silicone rubber having no apex angle was used as the buffer member 30. The contact member 20 is an iron ball. The sound collection unit 40 is installed on the support 10 via the vibration absorbing member 50. The vibration absorbing member 50 is a sponge. The sound collection unit 40 includes two microphone units having the same structure, and the two microphone units are arranged in parallel with the respective sound collection parts facing the contact member 20, and one microphone unit has a sound collection part. Sealed so that sound waves cannot be detected.

  Then, the outer wall tile without deterioration (hereinafter referred to as healthy part) shown in FIG. 6 and the deteriorated outer wall tile (hereinafter referred to as unhealthy part) shown in FIG.

  In addition, as a reference example, an inspection tool similar to the above was prepared, except that the contact member 20 was not directly connected to the support 10 without the buffer member shown in FIG.

  FIG. 9A and FIG. 9B show the inspection results of the healthy part and the unhealthy part performed using the inspection tool provided with the buffer member. Moreover, the inspection result of the healthy part and unhealthy part which were performed using the inspection tool which is not provided with a buffer member is shown to FIG. 10 (A) and FIG. 10 (B), respectively. 9A, 9B, 10A, and 10B, the horizontal axis represents time (seconds) and the vertical axis represents frequency (sound quality). Then, the larger the amplitude (volume) at the corresponding frequency, the darker the display.

  Comparing FIG. 9A and FIG. 9B, in FIG. 9A, no signal appears in a frequency band of about 3 kHz or less in the healthy part. On the other hand, in FIG. 9B, in the unhealthy part, in addition to the amplitude increasing in all frequency bands, a signal appears in a frequency band of about 3 kHz or less. The low frequency band signal that appears in the unhealthy part hardly appears in the healthy part. That is, when a signal appears in a low frequency band, it can be easily determined that peeling or deterioration occurs at the sliding position.

  On the other hand, in FIGS. 10 (A) and 10 (B), in the inspection tool that does not include the buffer member, the signal appears in the frequency band of 3 kHz or less, and there is a large difference between the healthy part and the unhealthy part. You can see that there is no. From this result, in the inspection tool that does not include the buffer member, it may be difficult to determine whether the detected signal is deteriorated, whether it is a healthy part or an unhealthy part. Recognize.

DESCRIPTION OF SYMBOLS 1 Inspection tool 10 Support body 11 Connection member 20 Contact member 30 Buffer member 40 Sound collection unit 41 Microphone unit 41a Diaphragm 41b Sound collection part 41c Opening part 42 Microphone unit 42a Diaphragm 42b Sound collection part 43 Arithmetic device 50 Vibration absorption member Wa wall

Claims (3)

A contact member that slides on the surface of the structure;
A support body on which the contact member is indirectly installed and supported;
The installed on a support, a first microphone unit for detecting vibrations including ultrasonic, said installed in parallel in proximity to the first microphone unit, a second detecting vibration wave detected is suppressed A microphone unit, and the first microphone unit and the second microphone unit are arranged so that the respective sound collectors face the same direction or the opposite direction; and
A shock-absorbing member that is installed between the contact member and the support and is elastically deformable;
An arithmetic device for adding or subtracting the output signal of the second microphone unit from the output signal of the first microphone unit so as to cancel the output signal ;
The buffer member that is formed of silicone rubber,
A structural inspection tool characterized by that. The first microphone unit and the second microphone unit are installed on the support via a vibration absorbing member;
The structure inspection tool according to claim 1, wherein: The first microphone unit and the second microphone unit are arranged with their respective sound collecting portions facing the contact member;
The sound collecting unit of the first microphone unit is opened, and the sound collecting unit of the second microphone unit is closed;
The arithmetic device subtracts the output signal of the second microphone unit from the output signal of the first microphone unit;
Inspection tool structure according to claim 1 or 2, characterized in that.