JP7388644B2 - Standard test specimen for condition evaluation equipment - Google Patents

Description

The present invention relates to a standard test body for a condition evaluation device for evaluating the condition of an object to be inspected.

Various methods have been proposed for diagnosing the condition of buildings in order to prevent peeling and peeling of exterior materials (external wall materials) of buildings.
Patent Document 1 discloses that a microphone is used to detect the hitting sound generated when the surface of an inspection target is hit with a hammer, a hitting sound detection waveform is generated based on the signal from the microphone, and a hitting sound detection waveform is generated based on the signal from the microphone. 2. Description of the Related Art An apparatus for evaluating the condition of an object to be inspected has been proposed, which evaluates the condition of the object based on the amplitude of one cycle of the generated waveform.

JP2016-205900A

With the above conventional technology, there is a concern that the amplitude of the generated hitting sound detection waveform will vary due to variations among the condition evaluation devices, such as individual differences in the sensitivity of the microphone and individual differences in the actuator that drives the hammer. be done.
If the amplitude of the hitting sound detection waveform varies, there is a disadvantage that the state evaluation results vary depending on the state evaluation device even for the same object to be inspected.
The present invention has been made in view of these circumstances, and its purpose is to provide a standard test specimen for a condition evaluation device that is advantageous in accurately evaluating the condition of an object to be inspected.

In order to achieve the above-mentioned object, the invention according to claim 1 detects the hitting sound generated by hitting the inspection object with a hammer using a microphone, and generates a hitting sound detection waveform based on the signal from the microphone. A standard test specimen for a condition evaluation device for an inspection object that generates a sound and evaluates the condition of the inspection object based on the detected hitting sound waveform, and is located opposite to the hit surface hit by the hammer. a struck board having a back surface that is shaped like a ball, and a struck board that holds the entire periphery of the struck board, and faces the entire inner portion of the periphery of the struck board with the back surface while holding the struck board; and a holding part that secures a space, and a striking target of the hammer is provided at a location where the center of the space and the striking surface intersect when the striking plate is viewed in plan. .
In the invention according to claim 2, the holding part is formed of a cylindrical main body member having a hole, the entire circumference of the hit plate is held by the main body part, and the hole is closed by the hit plate. and the space is formed by the hole.
In the invention according to claim 3, the hit plate is attached to an end of the main body member in the axial direction of the hole, and the back surface of the hit plate is attached to a surface that is aligned with the end of the main body member, or At least one of the surfaces of the end of the main body member that is matched with the hit plate is formed as a flat surface.
In the invention according to claim 4, a flange extending around the entire circumference of the inner circumferential surface is provided at a location near an end in the axial direction of the hole on the inner circumferential surface of the hole, and the hit plate is , an outer peripheral portion thereof is held by the flange and disposed inside the hole, and the hit surface of the hit plate and the end surface of the main body member in the axial direction of the hole are on the same plane. It is characterized by being located at the top.
In the invention according to claim 5, the outer circumference of the struck plate is embedded in the inner circumferential surface of the hole, and the struck surface is located at an end of the main body member in the axial direction of the hole. It is characterized by being located in a recessed area than the surface of the area.
The invention according to claim 6 is characterized in that the hit plate is located at an end of the main body member in the axial direction of the hole, and the hit plate and the main body member are integrally formed. do.
According to a seventh aspect of the invention, the holding portion includes a pedestal portion having an upper surface, and a spacer member disposed on the upper surface and having a hole in the center, and the hit plate is arranged around the entire periphery of the back surface. is held by the spacer member, and the space is formed between the inner peripheral surface of the hole and the upper surface.
The invention according to claim 8 is characterized in that the hit plate is provided to be detachably attached to the holding portion.
In the invention according to claim 9, the struck plate and the holding portion are integrally formed as a holding member, the struck plate is located at one end of the holding member in the axial direction, and the space is arranged such that the struck plate The holding member is provided opposite to the entire inner part around the periphery of the hit plate on the back surface of the holding member, and the space is filled with a material having lower strength and rigidity than the material constituting the holding member. .

According to the invention set forth in claim 1, when the hammer hits the hitting target, the hitting sound is reliably generated in the space, and by holding the entire periphery of the plate to be hit, variations in the hitting sound, that is, hitting sound can be detected. Waveform variations can be suppressed.
Therefore, by evaluating the object to be inspected by the condition evaluation device using the detected waveform of the hitting sound when hitting the standard test object, it is possible to suppress the influence of variations between condition evaluation devices.
This is advantageous in accurately evaluating the state of the object to be inspected.
According to the second aspect of the invention, the holding portion can be easily configured, which is advantageous in reducing costs.
According to the third aspect of the invention, a gap is unlikely to be formed between the struck plate and the cylindrical member, which is advantageous in firmly attaching the struck plate and the cylindrical member. Since variations in the hitting sound generated when hitting the target are suppressed, it is more advantageous in accurately evaluating the state of the object to be inspected.
According to the invention set forth in claim 4, it is advantageous in making the standard test specimen compact and in smoothly performing the operation of positioning the hammer to the striking target.
According to the invention set forth in claim 5, it is advantageous in protecting the hit plate.
According to the invention set forth in claim 6, it is advantageous in terms of cost reduction.
According to the invention set forth in claim 7, it is advantageous in simplifying the configuration of the holding portion and reducing costs.
According to the invention set forth in claim 8, it is possible to select a hit plate corresponding to the material or thickness of the object to be inspected and attach it to the main body.
According to the invention described in claim 9, it is advantageous in terms of cost reduction.

FIG. 1 is a block diagram showing the configuration of a condition evaluation device for an inspection object to which the standard test specimen according to the first embodiment is applied. FIG. 3 is a side view of a detection unit of the inspection object condition evaluation device. 3 is a view taken along line AA in FIG. 2. FIG. 3 is a view taken along arrow B in FIG. 2. FIG. FIG. 7 is a diagram showing the relationship between the state of the exterior material and the sound pressure of the hitting sound of the exterior material. (A) is a plan view of the standard test specimen according to the first embodiment, and (B) is a front sectional view of (A). 12 is a flowchart illustrating a process for determining a reference amplitude value using a standard test specimen. It is an operation flow chart of a state evaluation device of an object to be inspected. (A) is a plan view of a standard test specimen according to a second embodiment, and (B) is a front sectional view of (A). (A) is a plan view of a standard test specimen according to a third embodiment, and (B) is a front sectional view of (A). (A) is a plan view of a standard test specimen according to a fourth embodiment, and (B) is a front sectional view of (A). (A) is a plan view of a standard test specimen according to a fifth embodiment, and (B) is a front sectional view of (A). (A) is a plan view of a standard test specimen according to a sixth embodiment, and (B) is a front sectional view of (A). (A) is a plan view of a standard test specimen according to a seventh embodiment, and (B) is a front sectional view of (A). (A) is a plan view of a standard test specimen according to an eighth embodiment, and (B) is a front sectional view of (A). (A) is a plan view of a standard test specimen according to a ninth embodiment, and (B) is a front sectional view of (A). (A) is a plan view of a standard test specimen according to a tenth embodiment, and (B) is a front sectional view of (A).

(First embodiment)
Embodiments of the present invention will be described below.
First, a condition evaluation device for an object to be inspected (hereinafter referred to as a condition evaluation device) to which the standard test specimen of the present invention is applied will be described.
In this embodiment, the condition evaluation device evaluates the condition of the outer surface of the building that is the object to be inspected, that is,
A case will be explained in which the adhesion state of exterior materials such as tiles is evaluated, such as lifting or peeling.
Note that in this specification, the object to be inspected is a building or a structure, and when the object to be inspected is a building, the object to be inspected is not only the outer surface of the building but also the interior floor, ceiling, wall surface, etc. This includes a wide range of indoor concrete structures.
In addition, in this specification, the building exterior refers to the exterior of the building located at the outermost side of the building,
The building exterior includes not only the exterior of the building but also the interior near the exterior of the building if no exterior materials such as tiles or mortar are provided. In addition, when an exterior material such as tile or mortar is installed, the building exterior refers to the surface of the exterior material, as well as the part of the exterior material inside the surface of the exterior material and the building frame inside the exterior material. This shall include the surface and the interior near the surface.

As shown in FIG. 1, the condition evaluation device 10 includes a detection unit 12 and a main unit 14.
The detection unit 12 is used by a worker by holding it against the surface of the exterior material 2 whose condition is to be evaluated, and the main unit 14 represents the tapping sounds and vibrations detected by the detection unit 12. The condition of the exterior material 2 is evaluated based on the signal.
The detection unit 12 and the main unit 14 are connected by a cable (not shown) that transmits the above-mentioned signals.

As shown in FIGS. 2 to 4, the detection unit 12 includes a housing 16, three rollers 18A,
18B, 18C, hammer 20, actuator 22, first microphone 24A, and second
It is configured to include a microphone 24B and a striking force sensor 26.
The housing 16 includes a rectangular bottom wall 1602 and four side walls 1 rising from the four sides of the bottom wall 1602.
604, 1606, 1608, 1610 and four side walls 1604, 1606, 1608,
1610 and an upper wall 1612 that connects the upper part of the housing.
The bottom wall 1602 is provided with an opening 1620 through which a hammer 20, which will be described later, enters and exits.
Of the three rollers 18A, 18B, 18C, two rollers 18A, 18B are attached to the bottom wall 1.
It is rotatably attached to a pair of opposing end faces of 602 and arranged coaxially.
The remaining roller 18C is rotatably attached to the lower part of the side wall 1608 via the metal fitting 17, and when viewed from above, the roller 18C is on an axis parallel to the axes of the two rollers 18A and 18B. It is located.
And the three rollers 18A, 18B, 18C are the three rollers 18A, 18B.
, 18C are in contact with the surface of the exterior material 2, and the lower surface of the bottom wall 1602 and the surface of the exterior material 2 are provided parallel to each other at a constant interval.

As shown in FIG. 3, the hammer 20 hits the exterior material 2, which is the object to be inspected.
The actuator 22 applies a driving force to the hammer 20 in the striking direction.
In this embodiment, a 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 includes a solenoid main body 2202 including a coil, three rollers 18A,
18B and 18C are provided with a plunger 2204 that is movable in a direction perpendicular to the surface of the exterior material 2 while in contact with the surface of the exterior material 2.
The plunger 2204 is connected to the solenoid body 2202 by supplying driving power to the coil.
The solenoid body 2 is moved to the protruding position where it protrudes from the
202 and is configured to be moved to an immersed position.
As shown in FIGS. 3 and 4, the hammer 20 is provided at the lower end of the plunger 2204, and moves in and out through the opening 1620 in the bottom wall 1602 as the plunger 2204 moves.
With the outer peripheral surfaces of the three rollers 18A, 18B, and 18C in contact with the surface of the exterior material 2,
When the plunger 2204 moves to the protruding position, the hammer 20 hits the surface of the exterior material 2, and when the plunger 2204 moves to the retracted position, the hammer 20 separates from the surface of the exterior material 2.

The first microphone 24A and the second microphone 24B collect the hitting sound generated when the hammer 20 hits the surface of the exterior material 2, and generate a detection signal corresponding to the hitting sound.
As shown in FIG. 2, FIG. 3, and FIG. It is worn.
In this embodiment, a case will be described in which two microphones, the first microphone 24A and the second microphone 24B, are provided, but the number of microphones may be one or three or more.

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

As shown in FIG. 1, the main unit 14 includes a drive section 30, an operation section 32, an adjustment section 34, a detection circuit 36, a striking force waveform detection circuit 38, a sampling section 40, and a striking force waveform sampling section. 42, an amplitude value detection section 44, a normalized amplitude value calculation section 46, a reference amplitude value determination section 48, an evaluation section 50, and an output section 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 with a push button switch or the like.
The adjustment section 34 controls the drive section 30 to adjust the driving force applied to the hammer 20.
In this embodiment, the adjustment section 34 is operated by the operator to adjust the solenoid main body 2.
It increases or decreases the voltage of the driving power supplied to the coil 202, and is configured, for example, by a rotary volume (variable resistor) or the like.
By making the driving force applied to the hammer 20 adjustable in this way, the striking force of the hammer 20 can be adjusted so that a striking sound with an appropriate sound pressure is obtained depending on the condition and material of the object to be inspected. This is designed to be advantageous in accurately evaluating the state of objects.

The detection circuit 36 detects the detection signals generated by the first microphone 24A and the second microphone 24B.
/D conversion to generate a hitting sound detection waveform.
In this embodiment, a case will be described in which the detection circuit 36 generates a tapping sound detection waveform based on the detection signals detected by the first microphone 24A and the second microphone 24B. Only one of them may be used. However, generating detection signals using two microphones as in the present embodiment is advantageous in reliably detecting tapping sounds.
Further, the number of microphones may be one or three or more.

The striking force waveform detection circuit 38 performs A/D conversion on 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 at a predetermined sampling period.

The impact force waveform sampling section 42 samples the impact force detection waveform generated by the impact force waveform detection circuit 38 at a predetermined sampling period.

When the amplitude value detection unit 44 sets the Nth waveform (N is a natural number of 1 or more) among the plurality of one-period waveforms constituting the tapping sound detection waveform sampled by the sampling unit 40 as the first waveform, The amplitude value of this first waveform is detected.
Note that 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 this embodiment, the amplitude of the first cycle of the hitting sound detection waveform is larger than that of the second and subsequent waveforms. A case will be described in which the waveform corresponding to the period is used as the first waveform.
However, depending on various conditions such as the characteristics of the first microphone 24A, the second microphone 24B, and the detection circuit 36, the environment at the time of detection, or the state of the object to be inspected, the waveform that occurs after the second of the tapping sound detection waveforms may have the largest amplitude.
Therefore, in that case, the second and subsequent waveforms with the largest amplitude may be used as the first waveform.
In this 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 waveform in the first half of one cycle of the first waveform with reference to the amplitude reference value (0V), or 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.

Here, among the striking force detection waveforms detected by the striking force waveform detection circuit 38 and sampled by the striking force waveform sampling section 42, one period of the waveform that generates the first waveform of the striking sound detection waveform is converted into a second waveform. The reference time is the time corresponding to the earlier value of the maximum value or the minimum value of the second waveform.
In this embodiment, the first waveform for one period of the striking force detection waveform is defined as the second waveform.
The amplitude value detection section 44 determines the reference time based on the striking force detection waveform supplied from the striking force waveform sampling section 42 .
Detection of the amplitude value of the first waveform by the amplitude value detection section 44 is performed based on waveform data sampled from a time point before the reference time among the waveform data sampled by the sampling section 40.
By doing so, the first waveform can be accurately obtained, which is advantageous in accurately diagnosing the condition of the exterior material 2.

The reference amplitude value determination unit 48 determines the average value of a plurality of amplitude values obtained by hitting a standard test specimen 54A (described later) with the hammer 20 and detecting the amplitude value by the amplitude value detection unit 44 multiple times as a reference amplitude. It is determined as a value.
That is, by repeating the operation of hitting the hitting target 5408 of the standard test object 54A with the hammer 20 and detecting the amplitude value with the amplitude value detection unit 44 several times using the condition evaluation device 10, a plurality of amplitudes can be detected. You can get the value.
The reference amplitude value determination unit 48 calculates the average value of the plurality of obtained amplitude values, and determines the average value as the reference amplitude value.
In this way, the average value of a plurality of amplitude values obtained by hitting the standard test specimen 54A with the hammer 20 and detecting the amplitude value a plurality of times is determined as the reference amplitude value. Since the accuracy can be improved, the normalized amplitude value can be obtained more accurately, which is intended to be more advantageous in accurately evaluating the state of the object to be inspected.

The normalized amplitude value calculation unit 46 calculates a normalized amplitude value by dividing the amplitude value detected by the amplitude value detection unit 44 by the reference amplitude value determined by the reference amplitude value determination unit 48.
The reason for using the normalized amplitude value is as follows.
The microphones constituting the condition evaluation device 10 have individual differences in sensitivity, and even if they detect tapping sounds of the same sound pressure, the magnitude of the output detection signal varies.
Therefore, by calculating the normalized amplitude value by dividing the amplitude value detected by the amplitude value detection unit 44 by the reference amplitude value, it is possible to detect hitting sounds of the same sound pressure without being affected by variations in microphone sensitivity. 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.
To explain in detail, the evaluation unit 50 determines whether or not there is peeling on the inside of the inspection object, that is, the exterior material 2, based on the comparison result between the normalized amplitude value and a predetermined first threshold value.
Therefore, this is advantageous in easily and reliably determining whether or not the exterior material 2 has 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 explained.
FIG. 5 is a diagram showing the relationship between the state of the exterior material 2 and the sound pressure of the hitting sound of the exterior material 2, in other words, it shows the hitting sound detection waveform. In FIG. 5, the horizontal axis shows the elapsed time (μs) after the exterior material 2 is hit with the hammer 20, and the vertical axis shows the sound pressure (Pa) of the hitting sound.
The following four locations on the exterior material 2 to be struck with the hammer 20 are selected.
In this specification, a healthy part of the exterior cladding 2 refers to a part where the exterior cladding 2 has a good adhesion to the building frame and does not peel off, and a peeled part of the cladding 2 refers to a part where the exterior cladding 2 is partially attached to the building frame. Shows the part that has peeled off from the body.
a: Healthy area b: Healthy area edge (part of the healthy area close to the peeled part where the exterior material 2 has peeled off from the building frame)
c: Edge of the peeled part (part of the peeled part close to the healthy part)
d: Peeling part As is clear from FIG. 5, c
It can be seen that the amplitude of the hitting sound detection waveform near the peeled portion and the peeled portion d has a large value.
Based on 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 a predetermined first threshold value. Become.
The first threshold value is determined by determining the normalized amplitude value corresponding to the adhesion state of the exterior material 2, in other words, the presence or absence of peeling of the exterior material 2, as shown in FIG. What is necessary is to set a first threshold value that is sufficient to reliably determine.
Alternatively, the first threshold value may be set by determining a normalized amplitude value in a healthy portion of the exterior material 2, and multiplying or adding a predetermined constant to the normalized amplitude value.

Furthermore, the evaluation unit 50 evaluates the state of the exterior material 2 when the amplitude of the impact force detection waveform, in other words, the amplitude of the first impact force detection waveform is below a predetermined second threshold. cancel.
That is, if for some reason the hammer 20 does not strike the surface of the exterior material 2 (dry strike) or the impact is insufficient, the evaluation of the condition of the exterior material 2 is stopped. This is advantageous in accurately evaluating the condition of the exterior material 2.
The second threshold value is determined by actually measuring the amplitude of the impact force detection waveform detected when the surface of the exterior material 2 is struck with the hammer 20 and when it is struck blankly. What is necessary is to set a second threshold value that is sufficient to reliably determine whether the ball has been hit accurately or whether it has been a blank hit or an insufficient hit.

The output unit 52 outputs the result of the determination by the determination unit as to whether the exterior material 2 has peeled off, and the result of the position detection of the cavity by the determination unit.
The following are exemplified as the output section 52.
A display device that displays judgment results.
A printer device that prints judgment results on print media.
A recording device that records judgment results on a recording medium.
A communication device that sends judgment results to various terminal devices and data loggers via a line.

Note that the amplitude value detection section 44, the normalized amplitude value calculation section 46, the reference amplitude value determination section 48, and the evaluation section 5
0 can be configured by a computer.
A computer has a CPU, ROM, RAM, hard disk device, keyboard, mouse, display device, input/output interface, etc.
The ROM stores predetermined control programs and the like, and the RAM provides a working area.
The hard disk device stores a control program for realizing the amplitude value detection section 44, the normalized amplitude value calculation section 46, the reference amplitude value determination section 48, and the evaluation section 50.
The keyboard and mouse accept operation input from the operator.
The display device displays images, and is composed of, for example, a liquid crystal display device. The display device can function as the output section 52.

Next, the standard test specimen 54A according to this embodiment will be explained.
As shown in FIGS. 6(A) and 6(B), the standard test specimen 54A includes a holding portion 55 and a hit plate 58.
It is equipped with
The hit plate 58 has a hit surface 5802 that is hit by the hammer 20 and a back surface 5804 located opposite thereto.
The holding part 55 holds the entire circumference of the hit plate 58, and secures a space S facing the entire inner part of the periphery of the hit plate 58 on the back surface 5804 while holding the hit plate 58. It is something.
In this embodiment, the holding portion 55 is formed of a cylindrical main body member 56 having a hole 60.
The hit 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 hit plate 58 is held by the upper surface of the main body member 56, the upper part of the hole 60 is closed by the hit plate 58, and the space S is formed by the hole 60.
At least one of the surface of the back surface of the hit board 58 that is matched with the end of the main body member 56 or the surface of the end of the main body member 56 that is matched with the hit board 58 is formed as a flat surface.
In this embodiment, the main body member 56 has a cylindrical shape, the hole 60 is formed with an inner circumferential surface having a uniform inner diameter, and the axis of the outer circumferential surface of the main body member 56 and the axis of the hole 60 coincide with each other.
Further, an upper surface 5602, which is one end of the main body member 56 in the axial direction, is formed of a flat surface.
In this embodiment, the main body member 56 has an outer diameter of 300 mm and a thickness of 60 mm along the axial direction.
mm, and the diameter of the hole 60 is 160 mm.
In this embodiment, concrete is used as the material for the main body member 56;
Various conventionally known solid materials (solid materials) such as metal materials and synthetic resin materials can be used as materials.
is available.

The hit plate 58 closes the hole 60, has a larger profile than the cross section of the hole 60, and has a uniform thickness.
In this embodiment, the hit plate 58 has a disk shape with 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 flat surfaces.
In this embodiment, the hit plate 58 is attached to the main body member 56 by bonding the back surface 5804 to the top surface 5602 with adhesive, with the center of the hit surface 5802 and the axis of the hole 60 aligned. installed.
It should be noted that the entire area of the back surface 5804 excluding the portion facing the hole 60 is adhered to the upper surface 5602 with adhesive without any gaps, and the hit plate 58 and the upper surface 5602 are firmly attached by the impact of the hammer 20. This is preferable in terms of suppressing variations in the generated hitting sounds.
In addition, various conventionally known adhesives such as epoxy adhesives, silicone resin adhesives, modified silicone resin adhesives, acrylic resin adhesives, urethane resin adhesives, and rubber adhesives can be used as adhesives. It is.
The point where the center axis of the hole 60 intersects the hit surface 5802 is the hitting target 62 of the hammer 20, and the hitting target 62 and the center point of the hitting plate 58 coincide.
In this embodiment, straight lines CL1 and CL2 that are perpendicular 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 this embodiment, glass is used as the hit plate 58, but various conventionally known solid materials such as concrete, metal materials, synthetic resin materials, etc. can be used as the material for the hit plate 58.
Note that the thickness of the hit board 58 is the same 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 board 58 with the hammer 20. Since the sound detection waveform can be brought close to the hitting sound detection waveform detected from the hitting sound generated by hitting the object to be inspected with the hammer 20, this is useful in determining the reference amplitude value corresponding to the material of the object to be inspected. It will be advantageous.
The thickness of a typical tile is about 7 to 20 mm.
Furthermore, if the material of the hit plate 58 is the same as or similar to the material to be inspected, the hammer 20 can detect the hitting sound detection waveform detected from the hitting sound generated by hitting the hit plate 58 with the hammer 20. Since it can be made close to the hitting sound detection waveform detected from the hitting sound generated by hitting the object to be inspected, this is advantageous in determining the reference amplitude value corresponding to the material of the object to be inspected.
As in this embodiment, when the object to be inspected is a tile and the condition evaluation device 10 is used for the purpose of evaluating the presence or absence of a peeled part of the tile, a material similar to the tile can be used as the material of the hit plate 58. Using a certain glass is advantageous in determining a reference amplitude value that corresponds to the material of the object to be inspected.
In addition, the object to be inspected is a concrete filled steel tube structure (CFT).
When the condition evaluation device 10 is used for the purpose of evaluating the presence or absence of voids on the back side of a steel pipe, if a steel plate is used as the material of the hit plate 58, the inspection will be difficult because the steel pipe and the steel plate are made of almost the same material. This is advantageous in determining the reference amplitude value corresponding to the material of the object.

Next, the operation of the condition evaluation device 10 will be explained.
First, determination of the reference amplitude value using the standard test specimen 54A will be explained with reference to the flowchart of FIG.
First, the detection unit 12 of the condition evaluation device 10 is placed on the hit plate 58 of the standard test object 54A, and the hammer 20 is positioned directly above the hitting target 62 (step S
10).
Next, the operator operates the operation unit 32 (step S12), and thereby the hammer 20 hits the hitting target 62 on the hit plate 58 (step S14).
The hitting sound generated when the hammer 20 hits the hitting target 62 on the hit plate 58 is detected by the first microphone 24A and the second microphone 24B, and a detection circuit generates a sound based on the detection signals generated from these two microphones. 36 generates a hitting sound detection waveform, the generated hitting sound detection waveform is sampled by the sampling section 40, and the sampled waveform data is supplied to the amplitude value detecting section 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 determining unit 48 displays on the display device that operation of the operating unit 32 is required, and 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 a plurality of amplitude values obtained by hitting the standard test specimen 54A with the hammer 20 and detecting the amplitude value a plurality of times is determined as the reference amplitude value,
Since the accuracy of the reference amplitude value can be improved, the normalized amplitude value can be obtained more accurately.
This is more advantageous in accurately evaluating the state of the object to be inspected.

Next, referring to the flowchart of FIG. 8, a case will be described in which the condition of the exterior surface of the building, which is the object to be inspected, is evaluated using the condition evaluation device 10, that is, the adhesion condition such as lifting or peeling of the exterior material 2 such as tiles. explain.
First, the operator brings the three rollers 18A, 18B, and 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 operating section 32 (step S32), thereby causing the striking section 20 to strike the surface of the exterior material 2 (step S34).
The hitting sound generated when the hitting unit 20 hits 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 these two microphones. A hitting sound detection waveform is generated, and the generated hitting sound detection waveform is sampled by the sampling section 40 and supplied to the amplitude value detecting section 44 (step S36).
Further, the impact force generated by the hammer 20 when the impact unit 20 hits the surface of the exterior material 2 is detected by the impact force sensor 26, and the impact force waveform is detected based on the detection signal generated from the impact force sensor 26. A striking force detection waveform is generated by the circuit 38, the striking force detection waveform is sampled by the striking force waveform sampling section 42, and the sampled waveform data is supplied to the amplitude value detecting section 44. A reference time is determined (step S38).

The amplitude value detection unit 44 is configured based on the sampled hitting sound detection waveform. The amplitude value is detected based on the waveform of No. 1 and is supplied to the normalized amplitude value calculation unit 46 (step S40).
The normalized amplitude value calculation unit 46 calculates a normalized amplitude value 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 calculates the normalized amplitude value by dividing the amplitude value detected by the amplitude value detection unit 44, that is, the waveform data sampled by the sampling unit 40, (Step S42).

The evaluation unit 50 determines whether the amplitude of the striking force detection waveform is less than a predetermined second threshold (step S44).
If it is determined that the amplitude of the impact force detection waveform is less than the second predetermined threshold, the evaluation section 50 stops evaluating the state of the exterior material 2, and outputs the measured value from the output section 52. A notification is issued to prompt the user to try again (step S50). Such notification is made, for example, by displaying a comment urging a predetermined redo on a display device.
Then, the process moves to step S30.
On the other hand, if it is determined in step S44 that the amplitude of the striking force detection waveform is not less than the predetermined second threshold, the evaluation unit 50 compares the normalized amplitude value with the first threshold. Based on the comparison, it is determined whether or not the exterior material 2 has peeled off (step S46).
The output unit 52 outputs the determination result of the presence or absence of peeling of the exterior material 2 supplied from the evaluation unit 50 (
Step S48), the series of operations ends. From this point on, the same process as described above is repeated for the exterior material 2 to be next diagnosed.

In addition, a processing step (step S44) of determining whether the amplitude of the striking force detection waveform is less than a predetermined second threshold value, and a processing step (step S44) in which the amplitude of the striking force detection waveform is If it is determined that it is less than the threshold value, the evaluation unit 50 stops evaluating the state of the exterior material 2, and performs a processing step (step S5) of notifying the output unit 52 to restart the measurement.
0) may be performed at any time after the detection of the impact force detection waveform.

As described above, the condition evaluation device 10 detects the hitting sound generated when the surface of the exterior material 2 bonded to the building frame is hit with the hammer 20, generates the hitting sound detection waveform, and generates the hitting sound detection waveform. When the first waveform among the plurality of one-period waveforms constituting is the first waveform, the amplitude value of the first waveform is detected, and this amplitude value is divided by the reference amplitude value to obtain a normalized amplitude value. is calculated, and the state of the inspection object is evaluated based on the normalized amplitude value.
In this embodiment, the standard test object 54A for obtaining the reference amplitude value includes a hit plate 58 having a hit surface 5802 that is hit by the hammer 20 and a back surface 5804 located opposite thereto.
While holding the entire circumference of the hit plate 58, the back surface 580 is held while holding the hit plate 58.
4, and a holding part 55 that secures a space S facing the entire inner part of the periphery of the hit board 58, and when the hit board 58 is viewed from above, the center of the space S and the hit surface 5802 are A striking target 62 of the hammer 20 is provided at the intersection.
Therefore, when the hitting target 62 is hit with the hammer 20, by securing the space S on the back surface 5804 of the hit plate 58, a hitting sound can be reliably generated, and the entire circumference of the hit plate 58 can be By maintaining this, it is possible to suppress variations in the hitting sound, and therefore, variations in the amplitude of the hitting sound detection waveform are suppressed, and the reference amplitude value is stabilized.
Therefore, even if the amplitude of the generated hitting sound detection waveform varies due to variations among the condition evaluation devices 10, for example, due to individual differences in the sensitivity of the microphone, individual differences in the actuator 22 that drives the hammer 20, etc. Since the normalized amplitude value obtained based on the stable reference amplitude value is not affected by variations, it is advantageous in accurately evaluating the state of the object to be inspected.

Further, in this embodiment, the holding portion 55 is formed by a cylindrical main body member 56 having a hole 60, and the main body member 56 holds the entire circumference of the hit plate 58, and the hole 60 is formed by the hit plate 58. The hole 60 was closed to form a space S.
Therefore, the standard test specimen 54A can be realized with a simple configuration, which is advantageous in reducing costs.

In addition, in this embodiment, the surface of the hit plate 58 that is aligned with the end of the main body member 56 (the back surface 5
804) and the upper end surface 5602 of the end of the main body member 56 that is matched with the hit plate 58 are both formed of flat surfaces, so there is no gap between the back surface 5804 of the hit plate 58 and the upper end surface 5602. This is advantageous in firmly attaching the hit plate 58 and the main body member 56.
Therefore, variations in the hitting sound generated when hitting the hitting target 62 with the hammer 20 are suppressed, and the reference amplitude value becomes stable, which is more advantageous in accurately evaluating the condition of the inspection object. .
Note that if at least one of the surface (back surface 5804) of the struck plate 58 that is matched with the end of the main body member 56 and the upper end surface 5602 of the main body member 56 that is matched with the struck plate 58 is formed as a flat surface. , it is difficult to form a gap between the hit plate 58 and the main body member 56, which is advantageous in firmly attaching the hit 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 struck plate 58 and the main body member 56.

Further, in this embodiment, since the hole 60 is reliably closed by the hit plate 58 formed with a larger outline than the cross section of the hole 60, the striking sound generated when the hammer 20 hits the hitting target 62 This suppresses the variation in the state of the object to be inspected, which is more advantageous in accurately evaluating the state of the object to be inspected.

Note that in this embodiment, the case where the cross-sectional shape of the hole 60 is circular has been described;
The cross-sectional shape of 0 may be a triangle or a polygon.
However, in this embodiment, the striking target 62 and the hole 60 are
Since the distance from the inner surface of the hole 60 does not change over the circumferential direction of the hole 60, this is advantageous in suppressing the influence of the shape of the hole 60 on the hitting sound.
Furthermore, in this embodiment, the case has been described in which the main body member 56 is cylindrical, the hit plate 58 is disc-shaped, and the axis of the hole 60 and the center of the hit surface 5802 coincide. The main body member 56 has a triangular or polygonal cylindrical shape, the hit plate 58 has a triangular or polygonal plate shape, and the axis of the hole 60 and the center of the hit surface 5802 are aligned. may be configured so that they match.
However, in this embodiment, the back surface 5804 of the hit plate 58 is
The portion attached to 602 is annular with a uniform width.
Therefore, the attachment strength of the struck plate 58 to the upper end surface 5602 does not change along the circumferential direction of the main body member 56, compared to the case where the attachment strength of the struck plate 58 to the upper end surface 5602 changes along the circumferential direction. This is advantageous in suppressing the influence on the hitting sound.

In addition, in this embodiment, a reference amplitude value is obtained from the tapping sound detection waveform detected using the standard test object 54A, and the amplitude value obtained from the hitting sound detection waveform of the actual test object is divided by the reference amplitude value. The case where the normalized amplitude value is determined and the inspection object is evaluated has been explained.
However, the detection circuit 36 is provided with an amplification section that amplifies the detection signal from the microphone and an adjustment section that adjusts the amplification factor of the amplification section. The amplification factor of the amplification section may be adjusted by operating the adjustment section so that the value becomes a predetermined value.
In this case, the influence of variations among the condition 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 section. This is advantageous in accurately evaluating the state of the object.
That is, it is arbitrary how to utilize the hitting sound detection waveform detected using the standard test body 54A.
Therefore, the hitting sound generated by hitting the inspection object with the hammer 20 is detected using a microphone, a hitting sound detection waveform is generated based on the signal from the microphone, and the hitting sound is detected based on the hitting sound detection waveform. The standard test specimen 5 of the present invention can be used as a condition evaluation device for an object to be inspected.
4A is widely applicable.
In other words, regardless of the evaluation method used to evaluate the condition of the object to be inspected, the object to be inspected can be evaluated using the detected waveform of the hitting sound when the standard specimen 54A is hit with the hammer 20. For example, the standard test specimen 54A of the present invention can be applied.

(Second embodiment)
Next, a second embodiment will be described with reference to FIGS. 9(A) and 9(B).
In the following embodiments, parts and members similar to those in the first embodiment are given the same reference numerals as in the first embodiment, and their explanations are omitted, and different parts will be mainly explained. do.
In the standard test specimen 54B of the second embodiment, the hit plate 58 is attached to the holding portion 55 (main body member 56
) is removably attached to the
Specifically, a plurality of internal threads 5604 are provided on the upper end surface 5602 of the main body member 56 at intervals along the circumferential direction.
A bolt insertion hole 5810 is formed in the hit plate 58 at a location corresponding to each female screw 5604.
The hit plate 58 is removably attached to the holding portion 55 by fastening a plurality of bolts 64 to the female screws 5604 through the washers 65 and bolt insertion holes 5810, respectively.
Therefore, by preparing a plurality of hit plates 58 made of the same or similar material as the object to be inspected or formed with the same thickness as the object to be inspected, it is possible to 58 can be selected and attached to the body member 56.
Therefore, according to the second embodiment, in addition to achieving the same effects as the first embodiment, inspection can be performed by using the hit plate 58 that corresponds to the material and thickness of the object to be inspected. This is advantageous in determining the reference amplitude value corresponding to the material and thickness of the object.
Furthermore, in the first embodiment, the number of standard specimens 54A must be prepared in accordance with the material of the object to be inspected, but in the second embodiment, the number of standard specimens 54A must be prepared in accordance with the material of the object to be inspected. If the hit plate 58 is prepared, only one main body member 56 is required, which is advantageous in reducing the cost of the standard test specimen 54B.

(Third embodiment)
Next, a third embodiment will be described with reference to FIGS. 10(A) and 10(B).
In the standard test specimen 54C of the third embodiment, a flange 66 extending around the entire circumference of the inner circumferential surface is provided on the inner circumferential surface of the hole 60 at a location near the end of the hole 60 in the axial direction. There is.
The hit plate 58 is disposed inside the hole 60 with its outer peripheral portion held by the flange 66 .
The hit surface 5802 of the hit 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 plane.
Further, between the back surface 5804 of the hit plate 58 and the upper surface 6602 of the flange 66 and between the outer circumferential surface of the hit plate 58 and the inner circumferential surface of the hole 60 are bonded with adhesive. Since it is firmly attached to the main body member 56, it is advantageous in suppressing variations in the striking sound generated by the impact of the hammer 20.
According to the third embodiment, in addition to achieving the same effects as the first embodiment, since the hit plate 58 is arranged inside the hole 60, the standard test specimen 54C can be compacted. This will be advantageous for promoting
Further, since the hit surface 5802 and the upper end surface 5602 are located on the same plane, the detection unit 12 of the condition evaluation device 10 is placed on the hit surface 5802 and the hammer 20 is moved to the hitting target 6.
This is advantageous in smoothly performing the positioning operation.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIGS. 11(A) and 11(B).
The standard test specimen 54D of the fourth embodiment is a modification of the third embodiment, and the struck plate 58 is disposed with its outer circumference embedded in the inner circumferential surface of the hole 60. The surface 5802 is located at a location recessed from the upper end surface 5602, which is the end surface of the main body member 56 in the axial direction of the hole 60.
Such a standard test body 54D can be manufactured by pouring concrete or molten synthetic resin into a mold in which the hit plate 58 is placed and hardening it.
According to the fourth embodiment, in addition to achieving the same effects as the first embodiment,
As in the third embodiment, the hit plate 58 is disposed inside the hole 60, which is advantageous in making the standard test specimen 54C more compact.
In addition, since the hit plate 58 is located at a location recessed from the upper end surface 5602, it is possible to prevent the hit plate 58 from hitting an object and being damaged when the standard test object 54D is moved. This is advantageous in terms of protecting the environment.

(Fifth embodiment)
Next, a fifth embodiment will be described with reference to FIGS. 12(A) and 12(B).
In the standard test specimen 54E of the fifth embodiment, the hit plate 58 is located at the end of the main body member 56 in the axial direction of the hole 60, and the hit plate 58 and the main body member 56 are integrally molded. There is.
Such a standard test body 54E can be molded by pouring concrete or molten synthetic resin into a mold and hardening it.
According to the fifth embodiment, not only the same effects as the first embodiment can be achieved, but also adhesives and bolts are not required, which reduces the cost of the standard test specimen 54E. It is advantageous.

(Sixth embodiment)
Next, a sixth embodiment will be described with reference to FIGS. 13(A) and 13(B).
In the standard test specimen 54F of the sixth embodiment, the holding part 55 has a pedestal part 68 and a hole 7 in the center.
0 and a spacer member 72 having a diameter of 0.
The base portion 68, the spacer member 72, and the hit plate 58 are formed to have the same outer diameter.
The pedestal portion 68 has a cylindrical shape and has a circular top surface 6802 made of a flat surface and a circular bottom surface made of a flat surface.
The spacer member 72 has a uniform thickness, and is placed on and attached to the upper surface 6802 of the pedestal portion 68.
The entire circumference of the back surface 5804 of the hit plate 58 is placed on and attached to the spacer member 72.
The base portion 68, the spacer member 72, and the hit plate 58 are arranged coaxially.
A space S is formed between the inner peripheral surface of the hole 70 and the upper surface 6802.
According to the sixth embodiment, not only the same effects as the first embodiment can be achieved, but also the structure of the pedestal part 68 can be simplified by using the spacer member 72. In other words, This is advantageous in simplifying the configuration of the holding portion 55 and reducing costs.

(Seventh embodiment)
Next, a seventh embodiment will be described with reference to FIGS. 14(A) and 14(B).
The standard test specimen 54G of the seventh embodiment is a modification of the sixth embodiment, and the hit plate 58 is detachably attached to the holding part 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.
A bolt insertion hole 7202 is provided in the spacer member 72 at a location corresponding to each female thread 6804.
A bolt insertion hole 5810 is formed in the hit plate 58 at a location corresponding to each female screw 6804.
The hit plate 58 has a plurality of bolts 64 connected to washers 65 and bolt insertion holes 7202 and 5810.
By being fastened to the female screws 6804 through the respective screws, the holding portion 55 is removably attached to the holding portion 55.
Therefore, by preparing a plurality of hit plates 58 made of the same or similar material as the object to be inspected or formed with the same thickness as the object to be inspected, it is possible to 58 can be selected and attached to the body member 56.
Therefore, according to the seventh embodiment, in addition to the same effects as the sixth embodiment, the number of hit plates 58 that match the material and thickness of the object to be inspected can be prepared. If this is done, only one main body member 56 is required, and the same effects as in the second embodiment can be achieved.

(Eighth embodiment)
Next, an eighth embodiment will be described with reference to FIGS. 15(A) and 15(B).
In the standard test specimen 54H of the eighth embodiment, the hit plate 58 and the holding portion 55 are connected to the holding member 7.
4 is integrally formed.
The hit 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 to face the entire inner part of the periphery of the hit plate 58, and the space S has a cylindrical shape with a small height.
The space S is filled with a material 76 having lower strength and rigidity than the material constituting the holding member 74, and when the hammer 20 hits the hit plate 58, a hitting sound is reliably generated, and the hitting sound is transmitted to the first microphone. 24A and the second microphone 24B so that detection can be performed without any trouble.
For example, if the main body member 74 is made of concrete, the material 7 has low strength and rigidity.
As the material 6, various conventionally known materials such as expanded polystyrene resin can be used.
Therefore, according to the eighth embodiment, in addition to the same effects as the first embodiment, the hit plate 58 and the holding portion 55 are integrally formed as a holding member 74. Therefore, this is advantageous in reducing the cost of the standard test specimen 54H.

(Ninth and tenth embodiments)
Next, regarding the ninth and tenth embodiments, FIGS. 16(A), (B), and FIGS. 17(A), (B)
Explain with reference to.
Both the ninth and tenth embodiments are modifications of the first embodiment.
As shown in FIGS. 16(A) and 16(B), in the standard test specimen 54I of the ninth embodiment, the cylindrical main body member 56 forming the holding portion 55 has a rectangular shape in plan view, and This embodiment differs from the first embodiment in that the plate 58 has a rectangular plate shape with the same shape and size as the outline of the main body member 56, but other than that, the second embodiment is the same as the first embodiment.
Further, as shown in FIGS. 17(A) and 17(B), in the standard test specimen 54J of the tenth embodiment, the cylindrical main body member 56 forming the holding portion 55 has a rectangular shape in plan view. This embodiment differs from the first embodiment in that it has a square shape.
When viewed from above, the four sides of the square that forms the outline of the main body member 56 are in contact with the circular outline that forms the outline of the hit plate 58 .
The ninth and tenth embodiments also provide the same effects as the first embodiment.

In the embodiment, the object to be inspected by the condition evaluation device 10 to which the standard test specimens 54A to 54E are applied is a building, and the case where the adhesion state such as lifting or peeling of the exterior material 2 such as the tile 206 is to be evaluated is described. explained.
However, if the exterior material 2 such as tiles 206 or mortar is not provided,
When the condition evaluation device 10 evaluates the internal condition near the building exterior surface in addition to the exterior surface of the building, and when exterior material 2 such as tiles 206 or mortar is provided, in addition to the surface of exterior material 2, , when the condition evaluation device 10 evaluates the portion of the exterior material 2 inside the surface of the exterior material 2, the surface of the building frame inside the exterior material 2, or the interior near the surface, the standard test specimens 54A to 54E are applied. is possible.
Further, the standard test specimens 54A to 54E of the present invention are widely applicable to the condition evaluation apparatus 10 for evaluating indoor floors, ceilings, wall surfaces, indoor concrete frames, etc. of buildings.
Further, the standard test bodies 54A to 54E of the present invention are widely applicable to the case where the object to be inspected by the condition evaluation device 10 is not limited to buildings, but structures such as viaducts and dams are evaluated.

Furthermore, in the present embodiment, a hammer is used to detect a hammering sound generated by hitting an object to be inspected with a hammer, a hammering sound detection waveform is generated based on a signal from the microphone, and a hammering sound detection waveform is generated based on a signal from the microphone. Although we have explained the case where the condition of the inspection object is evaluated based on the hammer sound detection waveform, this book also applies when evaluating the condition of the inspection object based on the hammer sound detection waveform and the impact force generated on the hammer. The standard test specimen of the invention is of course applicable.
In this case, the inspection object condition evaluation device includes a striking unit that hits the inspection object with a hammer, a microphone that detects the hitting sound, and a waveform that generates a hitting sound detection waveform based on the signal from the microphone. a maximum impact force detection unit that detects a maximum impact force that is the maximum value of the impact force generated on the hammer during impact with the hammer; (N is a natural number of 1 or more) as a first waveform; an amplitude value detection unit that detects the amplitude value of the first waveform; and dividing the detected amplitude value by the maximum striking force. A primary normalized amplitude value calculation unit that calculates a primary normalized amplitude value by When the primary normalized amplitude value is set as a 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. The present invention includes a secondary normalized amplitude value calculation unit that calculates a value, and an evaluation unit that evaluates the state of the inspection object based on the secondary normalized amplitude value.

According to such an apparatus for evaluating the condition of an object to be inspected, the primary normalized amplitude value is normalized by dividing the amplitude value of the first waveform by the maximum impact force. Therefore, the primary normalized amplitude value is not affected by variations in the striking force of the hammer that occurs each time the hammer strikes the surface of the exterior material.
Further, the secondary normalized amplitude value is normalized by dividing the primary normalized amplitude value by a reference amplitude value determined based on a standard test specimen. Therefore, even if the amplitude of the generated tapping sound detection waveform varies depending on the condition evaluation device due to the influence of variations among the condition evaluation devices, the second order normalized amplitude value is It is not affected by variations among condition evaluation devices.
Therefore, the condition of the object to be inspected is not affected by both the variation in the striking force of the hammer that occurs each time the condition of the object to be inspected is evaluated by one condition evaluation device, and the variation between each condition evaluation device. This is advantageous in making accurate evaluations.

2 Exterior material 10 Condition evaluation device 20 Hammers 24A, 24B First and second microphones 54A to 54J Standard test object 55 Holding section 56 Main body member 5602 Upper end surface 5604 Female thread 58 Hit plate 5802 Hit surface 5804 Back surface 60 Hole 62 Hit target 66 Flange 68 Pedestal portion 70 Hole 72 Spacer member 74 Holding member 76 Material S with low strength and rigidity Space

Claims (5)

A hitting sound detection waveform corresponding to the hitting sound and a hitting force detection waveform corresponding to the hitting force are detected by hitting the object to be inspected, and a point in time before a reference time determined based on the hitting force detection waveform. A standard test body for a condition evaluation device that evaluates the condition of the object to be inspected based on waveform data of the hitting sound detection waveform sampled from the
a cylindrical main body member having one hole penetrating in the thickness direction;
a circular hit plate located on the upper surface of the main body member;
The hit surface is located on the opposite side of the hit plate from the main body member,
A standard test specimen in which the center of the hit surface and the axis of the hole coincide. A hitting sound detection waveform corresponding to the hitting sound and a hitting force detection waveform corresponding to the hitting force are detected by hitting the object to be inspected, and a point in time before a reference time determined based on the hitting force detection waveform. A standard test body for a condition evaluation device that evaluates the condition of the object to be inspected based on waveform data of the hitting sound detection waveform sampled from the
a cylindrical main body member having one hole penetrating in the thickness direction;
a circular hit plate located on the upper surface of the main body member;
The main body member and the hit plate are integrally molded,
The hit surface is located on the opposite side of the hit plate from the main body member,
A standard test specimen in which the center of the hit surface and the axis of the hole coincide. A hitting sound detection waveform corresponding to the hitting sound and a hitting force detection waveform corresponding to the hitting force are detected by hitting the object to be inspected, and a point in time before a reference time determined based on the hitting force detection waveform. A standard test body for a condition evaluation device that evaluates the condition of the object to be inspected based on waveform data of the hitting sound detection waveform sampled from the
a main body member having a rectangular shape in plan view and having one hole penetrating in the thickness direction;
a rectangular hit plate located on the upper surface of the main body member;
The hit surface is located on the opposite side of the hit plate from the main body member,
A standard test specimen in which the center of the hit surface and the axis of the hole coincide. The standard test specimen according to any one of claims 1 to 3, wherein the hit plate is made of glass. The standard test specimen according to any one of claims 1 to 3, wherein the main body portion is made of concrete.

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