JP2022000653A - Standard test body for state evaluation device - Google Patents

Abstract

To accurately perform a state evaluation of an inspection object.SOLUTION: A state evaluation device 10 detects hammering sound generated when a surface of an exterior material 2 adhered to a building skeleton is hammered with a hammer 20, creates a hammering sound detection waveform, detects an amplitude value of a first waveform, when a first waveform among a plurality of waveforms of one cycle constituting the hammering sound detection waveform is set as the first waveform, and calculates a normalization amplitude value obtained by dividing the amplitude value by a standard amplitude value, in order to perform a state evaluation of an inspection object according to the normalization amplitude value. A standard test body 54F for obtaining the standard amplitude value is constituted of: a hammered board 58 having a hammered surface 5802 to be struck with the hammer 20; and a holding part 55 for securing a space S in a state of holding the hammered board 58. The holding part 55 is composed of: a pedestal part 68; and a spacer member 72 having a hole 70 in the center. The space S is formed between an inner peripheral surface and an upper surface 6802 of the hole 70.SELECTED DRAWING: Figure 13

Description

The present invention relates to a standard test piece for a state evaluation device that evaluates the state of an object to be inspected.

Various methods for diagnosing the condition of a building have been proposed in order to prevent peeling and peeling of the exterior material (outer wall material) of the building.
In Patent Document 1, the tapping sound generated when the surface of the inspection object is hit with a microphone is detected by using a microphone, and the tapping sound detection waveform is generated based on the signal from the microphone to obtain the tapping sound detection waveform. A state evaluation device for an inspection object that evaluates the state of the inspection object based on the amplitude of the waveform for one cycle generated has been proposed.

Japanese Unexamined Patent Publication No. 2016-205900

In the above-mentioned conventional technique, there is a concern that the amplitude of the generated tapping sound detection waveform may vary due to the influence of the variation of each state evaluation device, for example, the individual difference of the sensitivity of the microphone, the individual difference of the actuator that drives the hammer, and the like. Will be done.
If the amplitude of the tapping sound detection waveform varies, there is a disadvantage that the state evaluation result varies depending on the state evaluation device even for the same inspection object.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a standard test body for a state evaluation device which is advantageous for accurately evaluating the state of an inspection object.

In order to achieve the above object, the present invention detects the tapping sound generated by hitting the inspection object with a hammer by using a microphone, and generates a tapping sound detection waveform based on the signal from the microphone. It is a standard test body for a state evaluation device for an inspection object that evaluates the state of the inspection object based on a tapping sound detection waveform, and has a hit surface hit by the hammer and a back surface located opposite to the hit surface. A space facing the entire circumference of the entire circumference of the impacted plate on the back surface while holding the impacted plate and the entire circumference of the impacted plate. A hitting target of the hammer is provided at a position where the center of the space and the hit surface intersect with each other in a state where the hit plate is viewed in a plan view, and the space is opened downward. It is characterized by being.
In the present invention, the holding portion is formed of a cylindrical main body member having a through hole, the entire circumference around the impacted plate is held by the main body portion, and the through hole is closed by the impacted plate. The space is characterized in that it is formed by the through hole.
In the present invention, the impacted plate is attached to the end of the main body member in the axial direction of the through hole, and the back surface of the impacted plate is aligned with the end of the main body member or the impacted plate. It is characterized in that at least one of the end faces of the main body member to be fitted to the main body member is formed of a flat surface.
In the present invention, a flange extending over the entire circumference of the inner peripheral surface is provided on the inner peripheral surface of the through hole at a position near the end in the axial direction of the through hole, and the impacted plate is the impacted plate thereof. The outer peripheral portion is held by the flange and arranged inside the through hole, and the impacted surface of the impacted plate and the surface of the end portion of the main body member in the axial direction of the through hole are flush with each other. It is characterized by being located on top.
In the present invention, the impacted plate is arranged so that the outer peripheral portion thereof is embedded in the inner peripheral surface of the through hole, and the impacted surface is the surface of the end portion of the main body member in the axial direction of the through hole. It is characterized by being located in a recessed area.
The present invention is characterized in that the impacted plate is located at the end of the main body member in the axial direction of the through hole, and the impacted plate and the main body member are integrally molded.
The present invention is characterized in that the impacted plate is detachably provided with respect to the holding portion.
The present invention is characterized in that the impacted plate is made of glass.
The present invention is characterized in that the impacted plate is made of a metal material.
The present invention is characterized in that the impacted plate is made of a synthetic resin.

According to the present invention, when a striking target is struck by a hammer, a striking sound is surely generated by the space, and the variation of the striking sound, that is, the variation of the striking sound detection waveform is generated by holding the entire circumference around the impacted plate. Can be suppressed.
Therefore, by evaluating the inspection object by the state evaluation device using the tapping sound detection waveform when the standard test piece is hit, the influence of the variation of each state evaluation device can be suppressed, and the state of the inspection object can be suppressed. It is advantageous for accurate evaluation of.
According to the present invention, the holding portion can be easily configured, which is advantageous in reducing the cost.
According to the present invention, a gap is unlikely to occur between the hit plate and the tubular member, which is advantageous in firmly attaching the hit plate and the tubular member. Therefore, the hit target is hit with a hammer. Since the variation in the tapping sound generated at that time is suppressed, it is more advantageous to accurately evaluate the state of the inspection object.
According to the present invention, it is advantageous in making the standard test piece compact and smoothly performing the operation of positioning the hammer at the striking target.
According to the present invention, it is advantageous in protecting the impacted plate.
According to the present invention, it is advantageous in reducing the cost.
According to the present invention, a hit plate corresponding to the material or thickness of the inspection object can be selected and attached to the main body.

It is a block diagram which shows the structure of the state evaluation apparatus of the inspection object to which the standard test body which concerns on 1st Embodiment is applied. It is a side view of the detection unit of the state evaluation apparatus of an inspection object. FIG. 2 is a view taken along the line AA of FIG. It is the B arrow view of FIG. It is a diagram which shows the relationship between the state of an exterior material, and the sound pressure of the tapping sound of an exterior material. (A) is a plan view of the standard test piece according to the first embodiment, and (B) is a front sectional view of (A). It is a flowchart explaining the determination process of the reference amplitude value using a standard test piece. It is an operation flowchart of the state evaluation apparatus of an inspection object. (A) is a plan view of the standard test piece according to the second embodiment, and (B) is a front sectional view of (A). (A) is a plan view of the standard test piece according to the third embodiment, and (B) is a front sectional view of (A). (A) is a plan view of the standard test piece according to the fourth embodiment, and (B) is a front sectional view of (A). (A) is a plan view of the standard test piece according to the fifth embodiment, and (B) is a front sectional view of (A). (A) is a plan view of the standard test piece according to the sixth embodiment, and (B) is a front sectional view of (A). (A) is a plan view of the standard test piece according to the seventh embodiment, and (B) is a front sectional view of (A). (A) is a plan view of the standard test piece according to the eighth embodiment, and (B) is a front sectional view of (A). (A) is a plan view of the standard test piece according to the ninth embodiment, and (B) is a front sectional view of (A). (A) is a plan view of the standard test piece according to the tenth embodiment, and (B) is a front sectional view of (A).

(First Embodiment)
Hereinafter, embodiments of the present invention will be described.
First, a state evaluation device (hereinafter referred to as a state evaluation device) for an inspection object to which the standard test piece of the present invention is applied will be described.
In the present embodiment, a case where the state evaluation device evaluates the state of the outer surface of the building, which is the object to be inspected, that is, the state of adhesion such as floating or peeling of the exterior material such as tiles will be described.
In the present specification, the inspection target is a building or a structure, and when the inspection target is a building, the inspection target is, for example, an indoor floor, ceiling, wall surface, in addition to the outer surface of the building. It includes a wide range of indoor concrete skeletons.
Further, in the present specification, the outer surface of the building means the outer surface of the building located on the outermost side of the building, and the outer surface of the building is added to the outer surface of the building when exterior materials such as tiles and mortar are not provided. , Including the internal condition near the outer surface of this building. In addition, when exterior materials such as tiles and mortar are provided, the exterior surface of the building is not only the surface of the exterior material, but also the exterior material part inside the surface of the exterior material and the building frame inside the exterior material. It shall include the surface and the interior near the surface.

As shown in FIG. 1, the state evaluation device 10 includes a detection unit 12 and a main body unit 14.
The detection unit 12 is used by being held by an operator and applied to the surface of the exterior material 2 whose state should be evaluated, and the main body unit 14 represents a tapping sound or vibration detected by the detection unit 12. The state of the exterior material 2 is evaluated based on the signal.
The detection unit 12 and the main body unit 14 are connected by a cable (not shown) for transmitting the above signal.

As shown in FIGS. 2 to 4, the detection unit 12 includes a housing 16, three rollers 18A, 18B, 18C, a hammer 20, an actuator 22, a first microphone 24A, and a second microphone 24B. , And a striking force sensor 26 are included.
The housing 16 is an upper wall connecting a rectangular bottom wall 1602, four side walls 1604, 1606, 1608, 1610 rising from the four sides of the bottom wall 1602, and the upper portions of the four side walls 1604, 1606, 1608, 1610. It is equipped with 1612.
The bottom wall 1602 is provided with an opening 1620 in which the hammer 20, which will be described later, appears.
Of the three rollers 18A, 18B, 18C, the two rollers 18A, 18B are rotatably attached to the pair of opposite end faces of the bottom wall 1602 and are arranged coaxially.
The remaining one roller 18C is rotatably attached to the lower part of the side wall 1608 via the metal fitting 17, and when viewed in a plan view, the roller 18C is on an axis parallel to the axes of the two rollers 18A and 18B. Have been placed.
The three rollers 18A, 18B, 18C have the lower surface of the bottom wall 1602 and the surface of the exterior material 2 in a state where the outer peripheral surfaces of the three rollers 18A, 18B, 18C are in contact with the surface of the exterior material 2. And are provided so as to be parallel to each other at regular intervals.

As shown in FIG. 3, the hammer 20 hits the exterior material 2 which is an inspection target, and the actuator 22 applies a driving force in the hitting direction to the hammer 20.
In this embodiment, the solenoid 22A is used as the actuator 22.
The solenoid 22A is arranged inside the housing 16 and attached to one side wall 1606.
The solenoid 22A is a plunger provided so that the solenoid main body 2202 having a coil and three rollers 18A, 18B, 18C can move in a direction orthogonal to the surface of the exterior material 2 in a state of being in contact with the surface of the exterior material 2. It is equipped with 2204.
The plunger 2204 is moved to a protruding position protruding from the solenoid main body 2202 when the driving power is supplied to the coil, and is moved to an immersive position immersed in the solenoid main body 2202 when the supply of the driving power is stopped. It is configured.
As shown in FIGS. 3 and 4, the hammer 20 is provided at the lower end of the plunger 2204, and when the plunger 2204 moves, it appears and disappears through the opening 1620 of the bottom wall 1602.
The hammer 20 hits the surface of the exterior material 2 by moving the plunger 2204 to the protruding position while the outer peripheral surfaces of the three rollers 18A, 18B, and 18C are in contact with the surface of the exterior material 2, and the plunger 2204. Moves to the immersion position, so that the hammer 20 separates from the surface of the exterior material 2.

The first microphone 24A and the second microphone 24B collect the tapping sound generated when the hammer 20 hits the surface of the exterior material 2 and generate a detection signal corresponding to the tapping sound.
As shown in FIGS. 2, 3 and 4, the first microphone 24A is attached to the lower surface of the bottom wall 1602, and the second microphone 24B is attached to the lower part of the outer surface of the side wall 1610 via the anti-vibration rubber 23. It is worn.
In the present embodiment, the case where two microphones, the first microphone 24A and the second microphone 24B, are provided will be described, but the number of microphones may be one or three or more.

As shown in FIG. 3, the striking force sensor 26 is attached to the hammer 20, and detects and impacts the reaction force generated on the hammer 20 by the impact of the hammer 20 on the exterior material 2, in other words, the impact force of the hammer 20. It generates a detection signal corresponding to the force. As such a striking force sensor 26, various conventionally known sensors such as a piezoelectric sensor can be used.
The striking force sensor 26 is attached to the hammer 20 and detects the vibration of the hammer 20 generated by the impact of the hammer 20 on the exterior material 2 to generate a detection signal corresponding to the vibration. As such a striking force sensor 26, various conventionally known sensors such as a piezoelectric sensor can be used.

As shown in FIG. 1, the main body unit 14 includes a drive unit 30, an operation unit 32, an adjustment unit 34, a detection circuit 36, a striking force waveform detection circuit 38, a sampling unit 40, and a striking force waveform sampling unit. It includes 42, an amplitude value detection unit 44, a normalized amplitude value calculation unit 46, a reference amplitude value determination unit 48, an evaluation unit 50, and an output unit 52.

The drive unit 30 supplies drive power to the coil of the solenoid body 2202.
The operation unit 32 is operated by an operator to instruct the drive unit 30 to supply drive power to the coil, and is configured by a push button switch or the like.
The adjusting unit 34 controls the driving unit 30 to adjust the driving force applied to the hammer 20.
In the present embodiment, the adjusting unit 34 increases or decreases the voltage of the driving power supplied to the coil of the solenoid main body 2202 by being operated by an operator, and is configured by, for example, a rotating volume (variable resistor). Has been done.
By making it possible to adjust the driving force applied to the hammer 20 in this way, the striking force of the hammer 20 can be adjusted so that an appropriate sound pressure striking sound can be obtained according to the condition and material of the inspection object, and the inspection target can be inspected. It is designed to be advantageous in accurately evaluating the condition of an object.

The detection circuit 36 A / D-converts the detection signals generated by the first microphone 24A and the second microphone 24B to generate a tapping sound detection waveform.
In the present embodiment, the case where the detection circuit 36 generates the tapping sound detection waveform by the detection signals detected by the first microphone 24A and the second microphone 24B will be described, but the first microphone 24A and the second microphone 24B will be described. Only one of the above may be used. However, generating a detection signal using two microphones as in the present embodiment is advantageous in reliably detecting the tapping sound.
Further, the number of microphones may be one or three or more.

The striking force waveform detection circuit 38 A / D-converts the detection signal generated by the striking force sensor 26 to generate a striking force detection waveform.

The sampling unit 40 samples the tapping sound detection waveform generated by the detection circuit 36 in a predetermined sampling cycle.

The striking force waveform sampling unit 42 samples the striking force detection waveform generated by the striking force waveform detection circuit 38 in a predetermined sampling cycle.

When the amplitude value detection unit 44 uses the Nth (N is a natural number of 1 or more) waveform as the first waveform among the plurality of waveforms of one cycle constituting the tapping sound detection waveform sampled by the sampling unit 40, The amplitude value of this first waveform is detected.
The larger the amplitude of the first waveform, the more advantageous it is in accurately measuring the amplitude value or the wavelength value. Therefore, in the present embodiment, the waveform for one cycle that occurs first in the tapping sound detection waveform has a larger amplitude than the waveforms of the second and subsequent cycles, and therefore, the waveform that occurs first in the tapping sound detection waveform 1 A case where the waveform for the cycle is set as the first waveform will be described.
However, depending on various conditions such as the characteristics of the first microphone 24A, the second microphone 24B, the detection circuit 36, the environment at the time of detection, or the state of the inspection object, the waveform generated after the second of the tapping sound detection waveforms. May have the largest amplitude.
Therefore, in that case, the waveform having the largest amplitude generated after the second one may be the first waveform.
In the present embodiment, the amplitude of the first waveform is the absolute value of the difference between the maximum value and the minimum value of the first waveform. However, the amplitude of the first waveform may be the absolute value of the peak value (extreme value) of the first half of one cycle of the first waveform with reference to the reference value (0V) of the amplitude, or the first. It may be the absolute value of the peak value (extreme value) of the waveform in the latter half of one cycle of the waveform of.

Here, among the striking force detection waveforms detected by the striking force waveform detection circuit 38 and sampled by the striking force waveform sampling unit 42, the waveform for one cycle that generates the first waveform of the striking sound detection waveform is used as the second waveform. The waveform is defined as the time corresponding to the earlier value of the maximum value or the minimum value of the second waveform as the reference time.
In the present embodiment, the waveform for one cycle generated first among the striking force detection waveforms is used as the second waveform.
The amplitude value detection unit 44 determines the reference time based on the striking force detection waveform supplied from the striking force waveform sampling unit 42.
The amplitude value of the first waveform is detected by the amplitude value detecting unit 44 based on the waveform data sampled from a time point earlier than the reference time among the waveform data sampled by the sampling unit 40.
By doing so, the first waveform can be accurately obtained, which is advantageous in accurately diagnosing the state of the exterior material 2.

The reference amplitude value determining unit 48 hits the standard test body 54A described later with the hammer 20 and detects the amplitude value by the amplitude value detecting unit 44 a plurality of times, and the reference amplitude is the average value of a plurality of amplitude values obtained. It is determined as a value.
That is, the operator hits the hitting target 5408 of the standard test piece 54A with the hammer 20 using the state evaluation device 10 and repeats the operation of detecting the amplitude value by the amplitude value detecting unit 44 a plurality of times. You can get the value.
The reference amplitude value determining unit 48 calculates the average value of the obtained plurality of amplitude values, and determines the average value as the reference amplitude value.
In this way, since the average value of the plurality of amplitude values obtained by hitting the standard test piece 54A with the hammer 20 and detecting the amplitude value a plurality of times is determined as the reference amplitude value, the reference amplitude value can be determined. Since the accuracy can be improved, the normalized amplitude value can be obtained more accurately, which is more advantageous for accurately evaluating the state of the inspection object.

The normalized amplitude value calculation unit 46 calculates a normalized amplitude value obtained by dividing the amplitude value detected by the amplitude value detecting unit 44 by the reference amplitude value determined by the reference amplitude value determining unit 48.
The reason for using the normalized amplitude value is as follows.
The microphones constituting the state evaluation device 10 have individual differences in sensitivity, and even if a tapping sound having the same sound pressure is detected, the magnitude of the detected signal to be output varies.
Therefore, when the normalized amplitude value obtained by dividing the amplitude value detected by the amplitude value detecting unit 44 by the reference amplitude value is obtained, it is possible to detect the tapping sound of the same sound pressure without being affected by the variation in the sensitivity of the microphone. The same normalized amplitude value can be obtained.

The evaluation unit 50 evaluates the state of the inspection object based on the normalized amplitude value.
More specifically, the evaluation unit 50 determines whether or not the inside of the inspection object, that is, the exterior material 2, is peeled off, based on the comparison result between the normalized amplitude value and the predetermined first threshold value.
Therefore, it is advantageous in easily and surely determining whether or not the exterior material 2 is peeled off.

Here, the relationship between the amplitude of the first waveform and the presence or absence of peeling of the exterior material 2 will be described.
FIG. 5 is a diagram showing the relationship between the state of the exterior material 2 and the sound pressure of the tapping sound of the exterior material 2, in other words, the tapping sound detection waveform. In FIG. 5, the horizontal axis shows the elapsed time (μs) after hitting the exterior material 2 with the hammer 20, and the vertical axis shows the sound pressure (Pa) of the hitting sound.
The following four locations are selected as the locations of the exterior material 2 to be hit by the hammer 20.
In the present specification, the sound part of the exterior material 2 means a part where the exterior material 2 has a good adhesive state to the building frame and there is no peeling, and the peeled part of the exterior material 2 is a part where the exterior material 2 is a building. The part peeled off from the skeleton is shown.
a: Healthy part b: Healthy part Kiwa (The part of the healthy part where the exterior material 2 is peeled off from the building frame and is close to the peeled part)
c: Peeling part wrinkles (the part of the peeling part that is close to the healthy part)
d: Peeling part As is clear from FIG. 5, the amplitude of the tapping sound detection waveform of the c-peeling part and d peeling part is a large value with respect to the amplitude of the tapping sound detection waveform of the a-healthy part and b-healthy part. You can see that it is.
From such knowledge, it is possible to determine the presence or absence of peeling of the exterior material 2 based on the comparison result between the normalized amplitude value corresponding to the amplitude of the first waveform and the predetermined first threshold value. Become.
As shown in FIG. 5, the first threshold value is the normalized amplitude value corresponding to each of the adhesive state of the exterior material 2, in other words, the presence or absence of peeling of the exterior material 2, and the peeling of the exterior material 2. It suffices to set a first threshold value sufficient to reliably determine.
Alternatively, the normalized amplitude value may be obtained from the sound portion of the exterior material 2, and the first threshold value may be set by multiplying the normalized amplitude value by a predetermined constant or adding a constant.

Further, the evaluation unit 50 evaluates the state of the exterior material 2 when the amplitude of the striking force detection waveform, in other words, the amplitude of the first striking force detection waveform falls below a predetermined second threshold value. To cancel.
That is, if the hammer 20 does not hit the surface of the exterior material 2 (blank shot) for some reason, or if the hit is insufficient, the evaluation of the state of the exterior material 2 is stopped. It is advantageous for accurately evaluating the state of the exterior material 2.
The second threshold value is the amplitude of the impact force detection waveform detected in each of the case where the surface of the exterior material 2 is hit by the hammer 20 and the case where the outer material 2 is hit, and the amplitude is measured with respect to the exterior material 2. It suffices to set a second threshold value sufficient to reliably determine the state in which the hit is made accurately and the state in which the hit is blank or insufficiently hit.

The output unit 52 outputs the determination result of the presence or absence of peeling of the exterior material 2 by the determination unit and the position detection result of the cavity by the determination unit.
The following is exemplified as the output unit 52.
A display device that displays the judgment result.
A printer device that prints the judgment result on a print medium.
A recording device that records the judgment result on a recording medium.
A communication device that sends the judgment result to various terminal devices and data loggers via a line.

The amplitude value detection unit 44, the normalized amplitude value calculation unit 46, the reference amplitude value determination unit 48, and the evaluation unit 50 can be configured by a computer.
The computer has a CPU, ROM, RAM, a hard disk device, a keyboard, a mouse, a display device, an input / output interface, and the like.
The ROM stores a predetermined control program and the like, and the RAM provides a working area.
The hard disk device stores a control program for realizing the amplitude value detection unit 44, the normalized amplitude value calculation unit 46, the reference amplitude value determination unit 48, and the evaluation unit 50.
The keyboard and mouse accept operation input by the operator.
The display device displays an image, and is composed of, for example, a liquid crystal display device. The display device can function as an output unit 52.

Next, the standard test body 54A according to the present embodiment will be described.
As shown in FIGS. 6A and 6B, the standard test piece 54A includes a holding portion 55 and a hit plate 58.
The hit plate 58 has a hit surface 5802 hit by the hammer 20 and a back surface 5804 located opposite to the hit surface 5802.
The holding portion 55 holds the entire circumference of the hit plate 58, and secures a space S facing the entire inner portion around the hit plate 58 on the back surface 5804 while holding the hit plate 58. It is a thing.
In the present embodiment, the holding portion 55 is formed of a cylindrical main body member 56 having a hole 60.
The impacted plate 58 is attached to the upper end of the main body member 56 in the axial direction of the hole 60.
The entire circumference of the impacted plate 58 is held by the upper surface of the main body member 56, the upper portion of the hole 60 is closed by the impacted plate 58, and the space S is formed by the hole 60.
At least one of the surface where the back surface of the impacted plate 58 is fitted to the end of the main body member 56 or the surface of the end of the main body member 56 to be fitted to the impacted plate 58 is formed of a flat surface.
In the present embodiment, the main body member 56 has a cylindrical shape, the hole 60 is formed by an inner peripheral surface having a uniform inner diameter, and the axial center of the outer peripheral surface of the main body member 56 and the axial center of the hole 60 coincide with each other.
Further, the upper surface 5602, which is one end in the axial direction of the main body member 56, is formed of a flat surface.
In the present embodiment, the main body member 56 has an outer diameter of 300 mm, a thickness of 60 mm along the axial direction, and a hole 60 having a diameter of 160 mm.
In the present embodiment, concrete is used as the material of the main body member 56, but various conventionally known solid materials (solid materials) such as metal materials and synthetic resin materials can be used as the material of the main body member 56.

The impacted plate 58 closes the hole 60, is formed with a contour larger than the cross section of the hole 60, and has a uniform thickness.
In the present embodiment, the impacted plate 58 has a disk shape having the same outer diameter as the main body member 56 and a thickness of 10 mm.
Both the hit surface 5802 and the back surface 5804 of the hit plate 58 are formed of a flat surface.
In the present embodiment, the impacted plate 58 is attached to the main body member 56 by adhering the back surface 5804 to the upper surface 5602 with an adhesive in a state where the center of the impacted surface 5802 and the axis of the hole 60 are aligned with each other. It is attached.
It should be noted that the entire area of the back surface 5804 except for the portion facing the hole 60 is adhered to the upper surface 5602 with an adhesive to strengthen the attachment between the impacted plate 58 and the upper surface 5602 by the impact of the hammer 20. This is preferable in suppressing the variation in the tapping sound that occurs.
In addition, various conventionally known adhesives such as epoxy adhesive, silicone resin adhesive, modified silicone resin adhesive, acrylic resin adhesive, urethane resin adhesive, and rubber adhesive can be used as the adhesive. Is.
The point where the central axis of the hole 60 and the hit surface 5802 intersect is set as the hitting target 62 of the hammer 20, and the hitting target 62 and the center point of the hit plate 58 coincide with each other.
In the present embodiment, the straight lines CL1 and CL2 orthogonal to each other are displayed on the hit surface 5802, and the hitting target 62 is indicated by the intersection of the straight lines CL1 and CL2.

In the present embodiment, glass is used as the impacted plate 58, but various conventionally known solid materials such as concrete, metal material, and synthetic resin material can be used as the material of the impacted plate 58.
It should be noted that the thickness of the hit plate 58 is the same as or almost the same as the thickness of the tile to be inspected, which is detected from the hitting sound generated by hitting the hit plate 58 with the hammer 20. Since the sound detection waveform can be brought close to the tapping sound detection waveform detected from the tapping sound generated by hitting the inspection object with the hammer 20, it is possible to determine the reference amplitude value corresponding to the material of the inspection object. It will be advantageous.
The thickness of a general tile is about 7 to 20 mm.
Further, assuming that the material of the impacted plate 58 is the same as or similar to that of the object to be inspected, the hammer 20 produces a tapping sound detection waveform detected from the tapping sound generated by striking the impacted plate 58 with the hammer 20. Since it can be made close to the tapping sound detection waveform detected from the tapping sound generated by hitting the inspection object, it is advantageous in determining the reference amplitude value corresponding to the material of the inspection object.
When the inspection target is a tile and the state evaluation device 10 is used for the purpose of evaluating the presence or absence of a peeled portion of the tile as in the present embodiment, the material of the impacted plate 58 is a material similar to the tile. The use of certain glass is advantageous in determining the reference amplitude value corresponding to the material of the object to be inspected.
Further, when the object to be inspected is a concrete filled steel pipe structure (CFT) and the state evaluation device 10 is used for the purpose of evaluating the presence or absence of voids on the back surface side of the steel pipe, the material of the impacted plate 58. When a steel plate is used as the material, the steel pipe and the steel plate are made of almost the same material, which is advantageous in determining the reference amplitude value corresponding to the material of the inspection object.

Next, the operation of the state evaluation device 10 will be described.
First, the determination of the reference amplitude value using the standard test piece 54A will be described with reference to the flowchart of FIG. 7.
First, the detection unit 12 of the state evaluation device 10 is placed on the impacted plate 58 of the standard test piece 54A, and the hammer 20 is positioned so as to be directly above the impact target 62 (step S10).
Next, the operator operates the operation unit 32 (step S12), whereby the hammer 20 hits the hit target 62 of the hit plate 58 (step S14).
The hitting sound generated by the hammer 20 hitting the hitting target 62 of the hit plate 58 is detected by the first microphone 24A and the second microphone 24B, and the detection circuit is based on the detection signals generated from these two microphones. The tapping sound detection waveform is generated by 36, the generated tapping sound detection waveform is sampled by the sampling unit 40, and the sampled waveform data is supplied to the amplitude value detection unit 44 (step S16).
The amplitude value detection unit 44 detects the amplitude value of the first waveform based on the supplied waveform data (step S18).
The reference amplitude value determination unit 48 determines whether or not the first amplitude value detection operation by the amplitude value detection unit 44 for determining the reference amplitude value has been performed a predetermined number of times (step S20).
If the determination result is negative, the reference amplitude value determination unit 48 causes the display device to indicate that the operation unit 32 needs to be operated, whereby the control returns to step S12.
If the determination result is affirmative, the reference amplitude value determination unit 48 calculates the average value of the amplitude values, determines the reference amplitude value, and supplies the reference amplitude value to the normalized amplitude value calculation unit 46 (step S22).
This completes the operation of determining the reference amplitude value.
In this way, since the average value of the plurality of amplitude values obtained by hitting the standard test piece 54A with the hammer 20 and detecting the amplitude value a plurality of times is determined as the reference amplitude value, the reference amplitude value is determined. Since the accuracy of the above can be improved, the normalized amplitude value can be obtained more accurately, which is more advantageous in accurately evaluating the state of the inspection object.

Next, refer to the flowchart of FIG. 8 regarding the case where the state of the outer surface of the building, which is the object to be inspected, is evaluated by using the state evaluation device 10, that is, the state of adhesion such as floating or peeling of the exterior material 2 such as tiles. explain.
First, the operator brings the three rollers 18A, 18B, 18C of the detection unit 12 into contact with the surface of the exterior material 2 to be diagnosed (step S30).
Next, the operator operates the operation unit 32 (step S32), whereby the striking unit 20 strikes the surface of the exterior material 2 (step S34).
The tapping sound generated by the striking portion 20 striking the surface of the exterior material 2 is detected by the first microphone 24A and the second microphone 24B, and is detected by the detection circuit 36 based on the detection signals generated from the two microphones. The tapping sound detection waveform is generated, and the generated tapping sound detection waveform is sampled by the sampling unit 40 and supplied to the amplitude value detection unit 44 (step S36).
Further, the striking force generated by the hammer 20 when the striking portion 20 strikes the surface of the exterior material 2 is detected by the striking force sensor 26, and the striking force waveform is detected based on the detection signal generated from the striking force sensor 26. The striking force detection waveform is generated by the circuit 38, the striking force detection waveform is sampled by the striking force waveform sampling unit 42, and the sampled waveform data is supplied to the amplitude value detection unit 44, whereby the amplitude value detection unit 44 The reference time is determined (step S38).

The amplitude value detection unit 44 is formed based on the sampled tapping sound detection waveform, in other words, the waveform data sampled from the time point before the reference time among the waveform data sampled by the sampling unit 40. The amplitude value is detected based on the waveform of No. 1 and supplied to the normalized amplitude value calculation unit 46 (step S40).
The normalized amplitude value calculation unit 46 calculates a normalized amplitude value obtained by dividing the amplitude value detected by the amplitude value detection unit 44, that is, the waveform data sampled by the sampling unit 40, by the reference amplitude value, and the evaluation unit 50. (Step S42).

The evaluation unit 50 determines whether or not the amplitude of the striking force detection waveform is less than a predetermined second threshold value (step S44).
When it is determined that the amplitude of the striking force detection waveform is less than a predetermined second threshold value, the evaluation unit 50 stops the evaluation of the state of the exterior material 2 and measures from the output unit 52. Notify that the user is urged to start over (step S50). Such notification is made, for example, by displaying a comment to the effect that a predetermined redo is urged by the display device.
Then, the process proceeds to step S30.
On the other hand, when it is determined in step S44 that the amplitude of the striking force detection waveform is not less than a predetermined second threshold value, the evaluation unit 50 sets the normalized amplitude value and the first threshold value. Based on the comparison, it is determined whether or not the exterior material 2 is peeled off (step S46).
The output unit 52 outputs a determination result of presence / absence of peeling of the exterior material 2 supplied from the evaluation unit 50 (step S48), and ends a series of operations. After that, the same treatment as above is repeated for the exterior material 2 to be diagnosed next.

In addition, a processing step (step S44) for determining whether or not the amplitude of the striking force detection waveform is less than a predetermined second threshold value, and a second predetermined amplitude of the striking force detection waveform. If it is determined that the value is less than the threshold value, the evaluation unit 50 stops the evaluation of the state of the exterior material 2 and notifies the output unit 52 that the measurement is to be repeated (step S50). It may be performed at any time after the impact force detection waveform is detected.

As described above, the state evaluation device 10 detects the tapping sound generated when the surface of the exterior material 2 adhered to the building frame is hit with the hammer 20, and generates the tapping sound detection waveform, and generates the tapping sound detection waveform. When the first waveform is the first waveform among the plurality of waveforms of one cycle constituting the above, the amplitude value of the first waveform is detected, and this amplitude value is divided by the reference amplitude value to obtain the normalized amplitude value. Is calculated, and the state of the inspection object is evaluated based on the normalized amplitude value.
In the present embodiment, the standard test piece 54A for obtaining the reference amplitude value is a hit plate 58 having a hit surface 5802 hit by the hammer 20 and a back surface 5804 located opposite to the hit surface 5802, and a hit plate 58. In a state where the entire circumference of the hit plate 58 is held and the hit plate 58 is held, the back surface 5804 is composed of a holding portion 55 that secures a space S facing the entire inner portion around the hit plate 58. A hitting target 62 of the hammer 20 is provided at a position where the center of the space S and the hitting surface 5802 intersect with the hitting plate 58 in a plan view.
Therefore, when the hitting target 62 is hit by the hammer 20, the hitting sound can be surely generated by securing the space S on the back surface 5804 of the hit plate 58, and the entire circumference of the hit plate 58 can be generated. It is possible to suppress the variation in the tapping sound by holding the above, and therefore, the variation in the amplitude of the tapping sound detection waveform is suppressed, and the reference amplitude value is stabilized.
Therefore, even if the amplitude of the generated tapping sound detection waveform varies due to the influence of the variation of each state evaluation device 10, for example, the individual difference of the sensitivity of the microphone, the individual difference of the actuator 22 for driving the hammer 20, and the like. Since the normalized amplitude value obtained based on the stable reference amplitude value is not affected by the variation, it is advantageous for accurately evaluating the state of the inspection object.

Further, in the present embodiment, the holding portion 55 is formed of a cylindrical main body member 56 having a hole 60, the entire circumference of the impacted plate 58 is held by the main body member 56, and the hole 60 is formed by the impacted plate 58. It was closed and the space S was formed by the holes 60.
Therefore, the standard test piece 54A can be realized with a simple configuration, which is advantageous in terms of cost reduction.

Further, in the present embodiment, both the surface (back surface 5804) at which the impacted plate 58 is fitted to the end portion of the main body member 56 and the upper end surface 5602 of the end portion of the main body member 56 fitted to the impacted plate 58 are both. Since it is formed of a flat surface, a gap is unlikely to occur between the back surface 5804 of the impacted plate 58 and the upper end surface 5602, which is advantageous in firmly mounting the impacted plate 58 and the main body member 56.
Therefore, the variation in the hitting sound generated when the hitting target 62 is hit with the hammer 20 is suppressed, the reference amplitude value becomes stable, and it is more advantageous for accurately evaluating the state of the inspection object. ..
If at least one of the surface (back surface 5804) where the impacted plate 58 is fitted to the end of the main body member 56 and the upper end surface 5602 of the main body member 56 fitted to the impacted plate 58 is formed as a flat surface. , A gap is unlikely to occur between the impacted plate 58 and the main body member 56, which is advantageous in firmly attaching the impacted plate 58 and the main body member 56. A gap is less likely to occur between the striking plate 58 and the main body member 56, which is more advantageous in firmly attaching the striking plate 58 and the main body member 56.

Further, in the present embodiment, since the hole 60 is surely closed by the hit plate 58 formed with a contour larger than the cross section of the hole 60, the hitting sound generated when the hitting target 62 is hit with the hammer 20. Since the variation in the inspection target is suppressed, it is more advantageous to accurately evaluate the condition of the inspection target.

In the present embodiment, the case where the cross-sectional shape of the hole 60 is a circle has been described, but the cross-sectional shape of the hole 60 may be a triangle or a polygon.
However, according to the present embodiment, since the distance between the striking target 62 and the inner surface of the hole 60 does not change in the circumferential direction of the hole 60 in a plan view, the influence of the shape of the hole 60 on the hitting sound is suppressed. It will be advantageous in doing so.
Further, in the present embodiment, the case where the main body member 56 is cylindrical, the impacted plate 58 is disk-shaped, and the axis of the hole 60 and the center of the impacted surface 5802 coincide with each other has been described. The main body member 56 has a triangular cylindrical shape or a polygonal tubular shape, and the hit plate 58 has a triangular plate shape or a polygonal plate shape, with the axis of the hole 60 and the center of the hit surface 5802. May be configured to match.
However, according to the present embodiment, the portion where the back surface 5804 of the impacted plate 58 is attached to the upper end surface 5602 becomes an annular shape having a uniform width.
Therefore, since the attachment strength of the impacted plate 58 to the upper end surface 5602 does not change along the circumferential direction of the main body member 56, the attachment strength of the impacted plate 58 to the upper end surface 5602 changes along the circumferential direction. This is advantageous in suppressing the influence on the tapping sound.

Further, in the present embodiment, the reference amplitude value is obtained from the tapping sound detection waveform detected using the standard test piece 54A, and the amplitude value obtained from the tapping sound detection waveform of the actual inspection object is divided by the reference amplitude value. The case where the normalized amplitude value is obtained and the inspection object is evaluated has been described.
However, the detection circuit 36 is provided with an amplification unit that amplifies the detection signal from the microphone and an adjustment unit that adjusts the amplification factor of the amplification unit, and the amplitude obtained from the tapping sound detection waveform detected using the standard test body 54A. The amplification factor of the amplification unit may be adjusted by operating the adjustment unit so that the value becomes a predetermined predetermined value.
In this case, the influence of variations among the state evaluation devices 10, such as individual differences in microphone sensitivity and individual differences in the actuator 22 that drives the hammer 20, can be suppressed by adjusting the amplification factor of the amplification unit. It is advantageous for accurately evaluating the condition of the object.
That is, how to use the tapping sound detection waveform detected by using the standard test piece 54A is arbitrary.
Therefore, the tapping sound generated by hitting the inspection object with the hammer 20 is detected by using the microphone, the tapping sound detection waveform is generated based on the signal from the microphone, and the inspection object is inspected based on the tapping sound detection waveform. The standard test piece 54A of the present invention is widely applicable as long as it is a state evaluation device for an inspection object for evaluating the state of the above.
That is, regardless of the evaluation method for evaluating the state of the inspection object, the inspection object can be evaluated by using the tapping sound detection waveform when the standard test piece 54A is hit with the hammer 20. For example, the standard test piece 54A of the present invention can be applied.

(Second embodiment)
Next, the second embodiment will be described with reference to FIGS. 9A and 9B.
In the following embodiments, the same parts and members as those in the first embodiment are designated by the same reference numerals as those in the first embodiment, the description thereof is omitted, and the different parts are mainly described. do.
In the standard test body 54B of the second embodiment, the impacted plate 58 is detachably attached to the holding portion 55 (main body member 56).
Specifically, a plurality of female threads 5604 are provided on the upper end surface 5602 of the main body member 56 at intervals along the circumferential direction thereof.
The impacted plate 58 is formed with a bolt insertion hole 5810 at a position corresponding to each female screw 5604.
The impacted plate 58 is detachably attached to the holding portion 55 by fastening a plurality of bolts 64 to the female screw 5604 via the washer 65 and the bolt insertion hole 5810, respectively.
Therefore, by preparing a plurality of hit plates 58 formed of the same or similar material as the inspection target or formed with the same thickness as the inspection target, the hit plates corresponding to the inspection target can be prepared. 58 can be selected and attached to the main body member 56.
Therefore, according to the second embodiment, in addition to achieving the same effect as that of the first embodiment, the inspection is performed by using the impacted plate 58 corresponding to the material and thickness of the inspection object. It is advantageous in determining the reference amplitude value corresponding to the material and thickness of the object.
Further, in the first embodiment, it is necessary to prepare a number of standard test pieces 54A according to the material of the inspection object, but in the second embodiment, the number of standard test pieces 54A according to the material of the inspection object is prepared. If the impacted plate 58 is prepared, only one main body member 56 is required, which is advantageous in reducing the cost of the standard test piece 54B.

(Third embodiment)
Next, the third embodiment will be described with reference to FIGS. 10A and 10B.
In the standard test piece 54C of the third embodiment, a flange 66 extending over the entire circumference of the inner peripheral surface is provided at a position near the end of the inner peripheral surface of the hole 60 in the axial direction of the hole 60. There is.
The outer peripheral portion of the impacted plate 58 is held by the flange 66 and is arranged inside the hole 60.
The impacted surface 5802 of the impacted plate 58 and the upper end surface 5602 of the main body member 56 in the axial direction of the hole 60 are located on the same surface.
Further, between the back surface 5804 of the impacted plate 58 and the upper surface 6602 of the flange 66, and between the outer peripheral surface of the impacted plate 58 and the inner peripheral surface of the hole 60, the impacted plate 58 is bonded to the impacted plate 58. Since it is firmly attached to the main body member 56, it is advantageous in suppressing the variation in the tapping sound generated by the impact of the hammer 20.
According to the third embodiment, in addition to the same effect as that of the first embodiment, the impacted plate 58 is arranged inside the hole 60, so that the standard test piece 54C is compact. It will be advantageous in trying to make it.
Further, since the impacted surface 5802 and the upper end surface 5602 are located on the same surface, the detection unit 12 of the state evaluation device 10 is placed on the impacted surface 5802 to position the hammer 20 at the impact target 62. It is advantageous for smooth operation.

(Fourth Embodiment)
Next, the fourth embodiment will be described with reference to FIGS. 11A and 11B.
The standard test body 54D of the fourth embodiment is a modification of the third embodiment, and the impacted plate 58 is arranged so that the outer peripheral portion thereof is embedded in the inner peripheral surface of the hole 60 and is impacted. The surface 5802 is located at a position recessed from the upper end surface 5602, which is the surface of the end portion of the main body member 56 in the axial direction of the hole 60.
Such a standard test piece 54D can be manufactured by pouring concrete or a molten synthetic resin into a mold in which a hit plate 58 is arranged and hardening the test piece 54D.
According to the fourth embodiment, in addition to the same effect as that of the first embodiment, the impacted plate 58 is arranged inside the hole 60 as in the third embodiment. Therefore, it is advantageous for making the standard test piece 54C compact.
Further, since the impacted plate 58 is located at a position recessed from the upper end surface 5602, it is possible to prevent the impacted plate 58 from hitting an object and being damaged when the standard test piece 54D is moved, and the impacted plate 58 can be prevented from being damaged. It is advantageous in trying to protect the body.

(Fifth Embodiment)
Next, the fifth embodiment will be described with reference to FIGS. 12A and 12B.
In the standard test piece 54E of the fifth embodiment, the impacted plate 58 is located at the end of the main body member 56 in the axial direction of the hole 60, and the impacted plate 58 and the main body member 56 are integrally molded. There is.
Such a standard test piece 54E can be molded by pouring concrete or a molten synthetic resin into a mold and curing it.
According to the fifth embodiment, it goes without saying that the same effect as that of the first embodiment is obtained, and since no adhesive or bolt is required, the cost of the standard test piece 54E can be reduced. It becomes advantageous in.

(Sixth Embodiment)
Next, the sixth embodiment will be described with reference to FIGS. 13 (A) and 13 (B).
In the standard test body 54F of the sixth embodiment, the holding portion 55 includes a pedestal portion 68 and a spacer member 72 having a hole 70 in the center.
The pedestal portion 68, the spacer member 72, and the impacted plate 58 are formed to have the same outer diameter.
The pedestal portion 68 has a columnar shape and has a circular upper surface 6802 formed of a flat surface and a circular bottom surface formed of a flat surface.
The spacer member 72 has a uniform thickness and is placed and attached to the upper surface 6802 of the pedestal portion 68.
The impacted plate 58 is attached by placing the entire circumference around the back surface 5804 on the spacer member 72.
The pedestal portion 68, the spacer member 72, and the impacted plate 58 are arranged coaxially.
The space S is formed between the inner peripheral surface of the hole 70 and the upper surface 6802.
According to the sixth embodiment, it goes without saying that the same effect as that of the first embodiment can be obtained, and the configuration of the pedestal portion 68 can be simplified by using the spacer member 72, in other words, It is advantageous in simplifying the configuration of the holding portion 55 and reducing the cost.

(7th embodiment)
Next, the seventh embodiment will be described with reference to FIGS. 14 (A) and 14 (B).
The standard test body 54G of the seventh embodiment is a modification of the sixth embodiment, and the impacted plate 58 is detachably attached to the holding portion 55.
That is, a plurality of female threads 6804 are provided on the upper surface 6802 of the pedestal portion 68 at intervals along the circumferential direction thereof.
The spacer member 72 is provided with a bolt insertion hole 7202 at a position corresponding to each female screw 6804.
The impacted plate 58 is formed with a bolt insertion hole 5810 at a position corresponding to each female screw 6804.
The impacted plate 58 is detachably attached to the holding portion 55 by fastening a plurality of bolts 64 to female threads 6804 via washers 65, bolt insertion holes 7202, and 5810, respectively.
Therefore, by preparing a plurality of hit plates 58 formed of the same or similar material as the inspection target or formed with the same thickness as the inspection target, the hit plates corresponding to the inspection target can be prepared. 58 can be selected and attached to the main body member 56.
Therefore, according to the seventh embodiment, in addition to achieving the same effect as that of the sixth embodiment, a number of impacted plates 58 corresponding to the material and thickness of the inspection object are prepared. If this is done, only one main body member 56 is required, so that the same effect as that of the second embodiment can be obtained.

(8th embodiment)
Next, the eighth embodiment will be described with reference to FIGS. 15A and 15B.
In the standard test body 54H of the eighth embodiment, the impacted plate 58 and the holding portion 55 are integrally formed as a holding member 74.
The impacted plate 58 is located at one end of the holding member 74 in the axial direction.
The space S is provided on the back surface 5804 of the hit plate 58 so as to face the entire inner portion around the hit plate 58, and the space S has a columnar shape having a small height.
The space S is filled with a material 76 having a strength and rigidity smaller than that of the material constituting the holding member 74, and the hammer 20 hits the hit plate 58 to surely generate a hitting sound, and the hitting sound is generated by the first microphone. It is designed so that it can be detected without any trouble by the 24A and the second microphone 24B.
For example, when the main body member 74 is made of concrete, various conventionally known materials such as Styrofoam resin can be used as the material 76 having low strength and rigidity.
Therefore, according to the eighth embodiment, in addition to the same effect as that of the first embodiment, the impacted plate 58 and the holding portion 55 are integrally formed as the holding member 74. Therefore, it is advantageous in reducing the cost of the standard test piece 54H.

(9th and 10th embodiments)
Next, the ninth and tenth embodiments will be described with reference to FIGS. 16A, 16B, 17A, and 17B.
The ninth and tenth embodiments are both modifications of the first embodiment.
As shown in FIGS. 16A and 16B, in the standard test body 54I of the ninth embodiment, the tubular main body member 56 forming the holding portion 55 has a rectangular shape in a plan view and is impacted. The plate 58 is different from the first embodiment in that it has a rectangular plate shape having the same shape and the same size as the contour of the main body member 56, and is the same as the first embodiment except that.
Further, as shown in FIGS. 17A and 17B, in the standard test body 54J of the tenth embodiment, the tubular main body member 56 forming the holding portion 55 has a rectangular shape in a plan view. The present embodiment is different from the first embodiment in that it exhibits a square shape.
When viewed in a plan view, the circular contour lines forming the contour of the impacted plate 58 are in contact with the four sides of the square constituting the contour of the main body member 56.
In such 9th and 10th embodiments, the same effect as that of the 1st embodiment is obtained.

In the embodiment, the inspection target of the state evaluation device 10 to which the standard test pieces 54A to 54E are applied is a building, and the adhesive state such as floating or peeling of the exterior material 2 such as the tile 206 is evaluated. explained.
However, when the exterior material 2 such as tile 206 or mortar is not provided, the state evaluation device 10 evaluates the internal state near the outer surface of the building in addition to the outer surface of the building, or the tile 206 or mortar or the like. When the exterior material 2 is provided, in addition to the surface of the exterior material 2, the surface of the exterior material 2 inside the surface of the exterior material 2 and the inside of the building frame inside the exterior material 2 or the inside near the surface are covered. When the state evaluation device 10 evaluates, it is possible to apply the standard test pieces 54A to 54E.
Further, the standard test bodies 54A to 54E of the present invention can be widely applied to the state evaluation device 10 for evaluating the floor, ceiling, wall surface, concrete frame in the room, and the like in the room of the building.
Further, the standard test bodies 54A to 54E of the present invention are not limited to buildings as the inspection target of the state evaluation device 10, and can be widely applied when evaluating structures such as viaducts and dams.

Further, in the present embodiment, the tapping sound generated by hitting the inspection object with a hammer is detected by using a microphone, the tapping sound detection waveform is generated based on the signal from the microphone, and the tapping sound detection waveform is generated. The case of evaluating the state of the inspection object based on the above is described, but in addition to the hitting sound detection waveform, the case of evaluating the state of the inspection object based on the hitting sound detection waveform and the striking force generated by the hammer is also described. Of course, the standard test piece of the invention is applicable.
In this case, the state evaluation device of the inspection object generates a hitting sound detection waveform based on a hitting portion for hitting the inspection target with a hammer, a microphone for detecting the hitting sound, and a signal from the microphone. The generation unit, the maximum striking force detection unit that detects the maximum striking force that is the maximum value of the striking force generated by the hammer when striking by the hammer, and N of the plurality of one-cycle waveforms constituting the striking sound detection waveform. When the second waveform (N is a natural number of 1 or more) is used as the first waveform, the amplitude value detection unit that detects the amplitude value of the first waveform and the detected amplitude value are divided by the maximum striking force. This was calculated by the primary normalized amplitude value calculation unit that calculates the primary normalized amplitude value, and the primary normalized amplitude value calculation unit when a predetermined standard test piece is used as the inspection target. When the primary normalized amplitude value is used as the reference amplitude value, the secondary normalized amplitude is obtained by dividing the primary normalized amplitude value calculated by the primary normalized amplitude value calculation unit by the reference amplitude value. It is provided with a secondary normalized amplitude value calculation unit for calculating a value and an evaluation unit for evaluating the state of an inspection object based on the secondary normalized amplitude value.

According to such a state evaluation device for an inspection object, the primary normalized amplitude value is normalized by dividing the amplitude value of the first waveform by the maximum striking force. Therefore, the primary normalized amplitude value is not affected by the variation in the striking force of the hammer generated for each striking motion of the surface of the exterior material by the hammer.
Further, the secondary normalized amplitude value is normalized by dividing the primary normalized amplitude value by a reference amplitude value obtained based on a standard test piece. Therefore, the secondary normalized amplitude value is affected by the variation of each state evaluation device, and even if the amplitude of the generated tapping sound detection waveform varies from state to state evaluation device, the secondary normalized amplitude value is It is not affected by the variation of each condition evaluation device.
Therefore, the condition of the inspection object is not affected by both the variation in the striking force of the hammer that occurs each time the condition of the inspection object is evaluated by one condition evaluation device and the variation in each condition evaluation device. It is advantageous for accurate evaluation of.

2 Exterior material 10 Condition evaluation device 20 Hammer 24A, 24B 1st and 2nd microphones 54A to 54J Standard test piece 55 Holding part 56 Main body member 5602 Upper end surface 5604 Female screw 58 Impacted plate 5802 Impacted surface 5804 Back surface 60 Hole 62 Impact target 66 Flange 68 Pedestal 70 Hole 72 Spacer member 74 Holding member 76 Material with low strength and rigidity S Space

In order to achieve the above object, the present invention detects the tapping sound generated by hitting the inspection object with a hammer by using a microphone, and generates a tapping sound detection waveform based on the signal from the microphone. A standard test body for a state evaluation device for an inspection object that evaluates the state of the inspection object based on a tapping sound detection waveform, and a surface to be hit by the hammer and a back surface located opposite to the hit surface. A space facing the entire circumference of the entire circumference of the impacted plate on the back surface while holding the impacted plate and the entire circumference of the impacted plate. The hitting target of the hammer is provided at a position where the center of the space and the hitting surface intersect in a state where the hitting surface is viewed in a plan view, and the hitting surface is made of glass. It is characterized by being done.
In the present invention, the holding portion includes a pedestal portion having an upper surface and a spacer member arranged on the upper surface and having a hole in the center. It is held by a member, and the space is characterized in that it is formed between the inner peripheral surface of the hole and the upper surface.
The present invention is characterized in that the impacted plate is detachably provided with respect to the holding portion.

According to the present invention, when a striking target is struck by a hammer, a striking sound is surely generated by the space, and the variation of the striking sound, that is, the variation of the striking sound detection waveform is generated by holding the entire circumference around the impacted plate. Can be suppressed.
Therefore, by evaluating the inspection object by the state evaluation device using the tapping sound detection waveform when the standard test piece is hit, the influence of the variation of each state evaluation device can be suppressed, and the state of the inspection object can be suppressed. It is advantageous for accurate evaluation of.
According to the present invention, it is advantageous in simplifying the configuration of the holding portion and reducing the cost.

Claims (10)

The tapping sound generated by hitting the inspection object with a hammer is detected by using a microphone, a tapping sound detection waveform is generated based on a signal from the microphone, and the tapping sound detection waveform is used as the basis for the inspection target object. A standard test piece for a condition evaluation device for an inspection object that evaluates the condition.
A hit plate having a hit surface hit by the hammer and a back surface located opposite to the hit surface,
A holding portion that holds the entire circumference of the impacted plate and secures a space facing the entire inner circumference of the entire circumference of the impacted plate on the back surface while holding the impacted plate. Prepare,
A hitting target of the hammer is provided at a position where the center of the space and the hitting surface intersect with each other in a plan view of the hitting plate.
The space is open downwards,
A standard test piece characterized by that. The holding portion is formed of a cylindrical main body member having a through hole, and is formed of a tubular main body member.
The entire circumference of the impacted plate is held by the main body, and the through hole is closed by the impacted plate.
The space is formed by the through hole.
The standard test body according to claim 1. The impacted plate is attached to the end of the main body member in the axial direction of the through hole.
At least one of the surface where the back surface of the hit plate is fitted to the end of the main body member or the surface of the end of the main body member to be fitted to the hit plate is formed of a flat surface.
2. The standard test piece according to claim 2. A flange extending over the entire circumference of the inner peripheral surface is provided at a position near the end of the inner peripheral surface of the through hole in the axial direction of the through hole.
The outer peripheral portion of the impacted plate is held by the flange and arranged inside the through hole.
The impacted surface of the impacted plate and the surface of the end portion of the main body member in the axial direction of the through hole are located on the same surface.
2. The standard test piece according to claim 2. The impacted plate is arranged so that its outer peripheral portion is embedded in the inner peripheral surface of the through hole.
The impacted surface is located at a position recessed from the surface of the end portion of the main body member in the axial direction of the through hole.
2. The standard test piece according to claim 2. The impacted plate is located at the end of the main body member in the axial direction of the through hole.
The impacted plate and the main body member are integrally molded.
2. The standard test piece according to claim 2. The impacted plate is detachably provided with respect to the holding portion.
The standard test piece according to any one of claims 1 to 4, wherein the standard test piece is characterized by the above. The impacted plate is made of glass.
The standard test piece according to any one of claims 1 to 5 or 7, wherein the standard test piece is characterized by the above. The impacted plate is made of a metal material,
The standard test piece according to any one of claims 1 to 5 or 7, wherein the standard test piece is characterized by the above. The impacted plate is made of synthetic resin.
The standard test piece according to any one of claims 1 to 5 or 7, characterized in that.

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