JP2002250721A - Device for inspecting architectural structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance transportation, portability and workability by incorporating an inspection hammer. SOLUTION: The equipment for inspecting an architectural structure comprises a shaking contactor 5 for converting an electric signal into a mechanical vibration being imparted to the architectural structure and a receiving contactor 6 for converting a mechanical vibration generated from the architectural structure into an electric signal, disposed in a detector body 10 incorporating a signal processing circuit, wherein the detector body 10 is fixed removably to the inspection hammer 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building structure inspection apparatus for non-destructively detecting a concrete defect of a building or a peeling or a defect of a tile used on a wall, and more particularly to a building structure incorporating an inspection hammer. The present invention relates to an object inspection device.

[0002]

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

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

[0004]

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

There have been some attempts to mechanically and electrically process this determination, but all of them have required a large-sized apparatus or an expensive measuring instrument. For example, JP-A-7-2
In the method disclosed in Japanese Patent Application Laid-Open No. 09262, an apparatus and a computer for hitting a tile to be inspected with a hammer and processing the hitting sound with a computer are required. In the method disclosed in Japanese Patent Application Laid-Open No. 2000-131290, the structure is complicated because a plurality of band-pass filters are prepared for analyzing the frequency. In addition, since the hammering sound is collected by the microphone, accurate measurement cannot be performed if there is another noise source that causes noise.

Further, in order to solve the above problems,
2. Description of the Related Art There is a simple and accurate nondestructive inspection device in which an excitation probe and a reception probe are brought into contact with a wall surface to be inspected to perform inspection. However, this non-destructive inspection device also
There were the following issues. As mentioned above, in the inspection of building structures such as tiles, hit the tiles with an inspection hammer,
A method of inspecting tile peeling by hearing is generally used. Although the impact test with this hammer is incomplete in terms of accuracy and reproducibility, it is excellent in terms of inspection speed,
By using together with the above-mentioned inspection device, an inspection with high accuracy can be efficiently performed. However, in order to use both the inspection with the inspection device and the impact test in this way, it is necessary to prepare two inspection devices and a hammer for inspection, which is inconvenient to transport and carry, and has poor workability. Was. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides a building structure inspection apparatus that incorporates an inspection hammer and enables a blow test without impairing transportation, portability, and workability. The purpose is to do.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a vibrating contact for converting an electric signal into a mechanical vibration and applying it to a building structure on a detector body incorporating a signal processing circuit. In a building structure inspection device provided with a receiving contact for converting mechanical vibration generated in a structure into an electric signal, the detector main body is detachably attached to an inspection hammer. Features. In the present invention, since the detector main body is attached to the inspection hammer, it is not necessary to separately prepare an inspection hammer, and it is not necessary to take the inspection hammer to a place, thereby improving workability.

The present invention also provides a vibrating contact for converting an electric signal into mechanical vibration and applying it to a building structure on a detector body incorporating a signal processing circuit. In a building structure inspection apparatus provided with a receiving contact for converting mechanical vibration into an electric signal, a handle holding the detector body is formed of a hollow telescopic rod, and the inside of the handle is The inspection hammer is removably inserted into the inspection hammer. In the present invention, since the inspection hammer is provided in the handle holding the detector main body, it is not necessary to separately prepare the inspection hammer, and it is not necessary to go to the place where the inspection hammer is placed, and the inside of the handle is saved. It is easy to put in and out.

Further, the present invention is characterized in that the detector main body is held so as to be swingable with respect to the handle of the inspection hammer. In the present invention, the detector main body can be arranged parallel to the inspected wall surface regardless of the angle of the inspected wall surface. Further, the present invention is characterized in that the inspection hammer is configured so that its handle can expand and contract. In the present invention, the length of the inspection hammer can be freely adjusted according to the height of the wall surface to be inspected.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a construction structure inspection apparatus according to an embodiment of the present invention. Figure 1
1 is a block diagram illustrating a configuration example of a signal processing circuit of a building structure inspection device of the present invention. This building structure inspection apparatus includes an oscillator 1, first and second amplifiers 2 and 3, a multiplier 4, a vibrating contact 5, a receiving contact 6, and a low-pass filter 7. Have been. The vibrating contact 5 converts an electric signal into mechanical vibration, and is composed of, for example, a piezoelectric speaker. The receiving contact 6 converts mechanical vibration into an electric signal, and is composed of, for example, a piezoelectric element.

While the vibrating contact 5 and the receiving contact 6 are in contact with the wall 8 to be inspected such as a tile or a concrete structure, for example, a sine wave signal is generated by the oscillator 1, The signal is amplified and output as an excitation signal Vr. The excitation signal Vr is applied to the excitation contact 5, and the vibration of the excitation contact 5 causes the wall surface 8 to be inspected of the building structure to vibrate. This vibration is received by the receiving contact 6, converted into an electric signal, amplified by the amplifier 3, and output as a received signal Vi. The two signals Vr and Vi are multiplied by a multiplier 4 and passed through a low-pass filter 7 to output a judgment output voltage V0 from an output terminal 9. The determination output voltage V0 is a signal that reflects the amplitude and phase of the received signal with respect to the frequency change of the excitation signal. Therefore, the judgment output voltage V0 represents the frequency characteristic of the building structure. Since the frequency characteristics are different between the normal wall surface and the abnormal wall surface, an abnormal wall surface such as a peeled tile can be determined.

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

FIGS. 3 to 7 show an embodiment of the present invention, and show the structure of a building structure inspection apparatus incorporating a hammer. FIG. 3 shows a first embodiment of the present invention, in which a building structure inspection apparatus A includes a detector main body 10 in which a signal processing circuit is incorporated, and
And a hammer 12 to which the frame 11 is attached. A vibrating contact 5, a receiving contact 6, and a spacer 16 are provided on one side surface of the detector main body 10.

The inspection hammer 12 comprises a handle 12a and a hammer head 12b provided at the tip thereof. The handle 12a is a telescopic rod antenna. The hammer head 12b has a shape in which a flat surface 13 is formed on a side portion of a spherical body, and a screw hole 14 is formed in the flat surface 13. 1
It is fixed at 7.

Next, the operation will be described. When inspecting the wall surface 8 to be inspected such as a tile attached to the building structure 20, the handle 12 a is held in hand, and the vibrating contact 5 and the receiving contact 6 are brought into contact with the wall 8 to be inspected. Perform an inspection. At this time, the detector main body 10 swings via the shaft 15, and the spacer 16 serves to keep the detector main body 10 parallel to the wall surface 8 to be inspected. Next, when performing a hammer inspection, after removing the screw 17 and removing the hammer head 12b from the frame 11 (see FIG. 5B), the hammer head 1 is held with the handle 12a.
In step 2b, the wall surface 8 to be inspected is hit and the inspection is performed by listening sound.
As described above, since the detector main body 10 is attached to the inspection hammer 12, it is not necessary to separately prepare an inspection hammer, and it is not necessary to take the inspection hammer to a place for each inspection, thereby improving workability.

Although the handle 12a has the shape of an extendable rod antenna, the structure of the handle 12a is not limited. Further, the fixing means to the frame 11 is not limited to the screw 15, and for example, an insertion key, a pin, or any other fixing means that can be removed can be used.

FIGS. 6A and 6B show a second embodiment of the present invention. FIG. 6A is a partial front view of an inspection hammer and a frame, and FIG. 6B is a partial side view thereof. Inspection hammer 12
Is designed so that a spherical hammer head 12b 'can be inserted and fixed in a substantially hemispherical recess 11 "formed in a frame 11'. Then, insert the hammer head 12b 'into the recess 11''.
And fixed by screws 17 with screw holes formed in the hammer head 12 '' and screw holes formed in the recessed portions 11 ''.

FIG. 7 shows a third embodiment of the present invention. A detector body 10 (not shown) is fixed to the upper end of the handle 18. This handle 18 is made of a tubular telescopic rod,
An inspection hammer 20 is inserted into the internal space of the handle 18, and a cap 19 is detachably attached to a lower end of the handle 18. The inspection hammer 20 comprises a telescopic rod 20a and a spherical hammer head 20b provided at the tip thereof.
It is configured to fit inside the handle 18.

When transporting or storing, the inspection hammer 20 is inserted into the handle 18 as shown in FIG. 6A, and when inspecting, the cap 19 is removed as shown in FIG. 6B. The hammer 20 is taken out of the handle 18 and the detector body 10 is removed.
The inspection is performed by both the inspection hammer 20 and the inspection hammer 20. As described above, since the inspection hammer 20 is provided on the handle 18 holding the detector main body 10, it is not necessary to separately prepare an inspection hammer, and it is possible to save the trouble of having to place the inspection hammer every time an inspection is performed. Also, the operation of taking in and out of the handle 18 is easy.

[0020]

As described above, according to the present invention,
Since the detector body is attached to the inspection hammer, it is not necessary to prepare a separate inspection hammer, it is convenient to carry and store, and it is not necessary to take the inspection hammer to the place for each inspection. Workability is improved. Also,
According to the present invention, since the inspection hammer is provided in the handle holding the detector main body, it is not necessary to separately prepare an inspection hammer, and it is convenient to carry and store. It saves you the trouble of getting to the place,
The workability is improved, and the operation of taking the inspection hammer in and out of the handle is easy. Further, according to the present invention, since the detector main body is held so as to be able to swing with respect to the handle of the inspection hammer, the detector main body is arranged parallel to the inspected wall regardless of the angle of the inspected wall. can do. Further, according to the present invention, since the pattern of the inspection hammer is configured to be extendable, the length of the inspection hammer can be freely adjusted according to the height of the wall surface to be inspected.

[Brief description of the drawings]

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

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

FIG. 3 is a side view showing the first embodiment of the building structure inspection apparatus of the present invention.

FIG. 4 is a front view of FIG. 3;

FIG. 5 (a) is a front view of the building structure inspection apparatus of FIG. 3,
(B) is a front view of the inspection hammer.

FIG. 6A is a partial front view showing a second embodiment of the building structure inspection apparatus of the present invention, and FIG. 6B is a partial side view.

FIG. 7A is a longitudinal sectional side view showing a third embodiment of the building structure inspection apparatus of the present invention, and FIG. 7B is an exploded side view.

[Explanation of symbols]

 5 Contact for vibration 6 Contact for reception 8 Wall surface to be inspected 10 Detector body 11 Frame 15 Axis 12 Inspection hammer 12a Handle 12b Hammer head 18 Handle 20 Inspection hammer 20a Handle 20b Hammer head

Claims (4)

[Claims] 1. A vibrating contact for converting an electric signal into mechanical vibration and applying it to a building structure, and a mechanical vibration generated in the building structure. A building structure inspection apparatus provided with a receiving contact for converting the light into an electric signal, wherein the detector body is detachably attached to an inspection hammer. . 2. A vibrating contact for converting an electric signal into mechanical vibration and applying it to a building structure, and a mechanical vibration generated in the building structure. In a building structure inspection device provided with a receiving contact for converting an electric signal into an electric signal, a handle holding the detector body is formed of a hollow telescopic rod, and an inspection hammer is provided inside the handle. An inspection apparatus for a building structure, which is detachably inserted. 3. The building structure inspection apparatus according to claim 1, wherein the detector main body is held swingably with respect to a handle of the inspection hammer. 4. The building structure inspection apparatus according to claim 1, wherein a pattern of the inspection hammer is configured to be extendable and contractible.