Hammering test method and hammering test system of existing structure

Abstract

To provide a hammering test method and a hammering test system which allow an inspector to execute an accurate hammering test in a feeling similar to that when the inspector is at the site, even when the inspector is at a place separated from the site where an existing structure exists.SOLUTION: A hammering test method is for testing a deterioration state of an existing structure 40 using striking sound caused by striking to a test object region on the existing structure and the method comprises: a striking sound recording step S12 for recording sound recording data of the striking sound in association with striking position data; an image display step S14 of the test object region for displaying on a display part 26, an image of the test object region with which a coordinate system for identifying each position of the existing structure and the recorded sound recording data of the striking sound are associated; a striking sound output point specification step S15 for allowing a user to select and specify a point where output of the striking sound is desired on the displayed image of the test object region; and a striking sound output step S16 for outputting the sound recording data of the striking sound at a position closest to the specified point.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a hammering inspection method and a hammering inspection system, and more particularly to a hammering inspection method and a hammering inspection system for an existing structure that associates hammering sounds with hammering positions and stores them to inspect the condition of the structure being inspected. [Background technology]

[0002] Existing structures such as tunnels and bridges inevitably deteriorate over many years of use. For example, in concrete structures, the properties of the concrete change over time, causing spalling, cracks, water leakage, etc., so it is important to identify and manage such damaged areas and carry out appropriate repair work in order to prevent accidents such as spalling.

[0003] Methods for inspecting the deterioration of existing structures include non-destructive inspections such as hammering inspections, infrared inspections, and ultrasonic inspections. In particular, hammering inspections are used at various construction sites because they are highly reliable contact inspections that directly strike existing structures. In hammering inspections, inspectors evaluate the degree of deterioration by hitting the existing structure with a hammer or similar tool on-site and listening to the hammering sounds that are produced. If the inspector detects any abnormality in the hammering sounds, he or she records the location in the inspection ledger.

[0004] As a device used for the hammering inspection, Patent Document 1 describes a hammering inspection recording device that records the hammering sound and the striking position in a computer. This hammering inspection recording device is equipped with a contact vibration sensor that detects the hammering sound and the range sensor that detects the striking position of the hammer using laser light. Then, the hammering sound generated by striking an existing structure with a hammer and the striking position are associated and automatically recorded in the memory of the device. An inspector who strikes the existing structure can see the striking position history displayed on the display of the hammering inspection device in real time during the inspection, and can eliminate any remaining strikes. By automatically recording the hammering sound and striking position in this way, it is possible to reduce the inspection labor by eliminating the need for a person to manually record the strike in an inspection ledger. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6846742 Summary of the Invention [Problem to be solved by the invention]

[0006] In the hammering inspection recording device described in Patent Document 1, a user can specify a striking position of an existing structure recorded in memory, and play back and listen to the striking sound generated at this striking position. However, even if an arbitrary position on an existing structure is specified, if there is no recording of the striking sound at the specified position, the striking sound cannot be played back.

[0007] Therefore, when listening to the impact sounds recorded after the fact at a location away from the site, it was not possible to arbitrarily and continuously select the impact position and listen to the continuous changes in the impact sounds, as would be possible when performing an impact sound inspection on site. In other words, since the impact sound was listened to by selecting and specifying the impact position where the impact sound was recorded, it was not possible to take an effective inspection method such as continuously listening to the changes in the impact sounds while moving the arbitrary position.

[0008] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a hammering inspection method and a hammering inspection system that make it possible to carry out an effective hammering inspection in a manner approximating the situation of listening to hammering sounds while actually striking at the site where an existing structure is located, while being located away from the site. [Means for solving the problem]

[0009] In order to achieve the above object, the hammering inspection method according to claim 1 comprises: A hammering inspection method for inspecting a deterioration state of an existing structure by using hammering sounds generated by striking an inspection target area of ​​the existing structure, comprising: a striking sound recording step of recording the striking sound data in association with striking position data that identifies the striking position; an image display process of the inspection target area, which displays an image of the inspection target area on a display unit, to which a coordinate system for identifying each position of the existing structure and the recorded data of the hammering sounds are linked; a hammering sound output point designation step in which a user selects and designates a point at which the hammering sound is desired to be output on the image of the inspection target area displayed on the display unit; a hitting sound output step of outputting recording data of the hitting sound at a position closest to the designated point when a designated action is performed in the hitting sound output point designation step; The present invention is characterized by comprising:

[0010] With this configuration, at a site where an existing structure exists, a worker or a self-propelled impact device or the like strikes the inspection area of ​​the existing structure with an impact tool, and using recorded data of the impact sound, and impact position data that identifies the position of the strike, it is possible to perform an inspection at a location away from the site in a manner similar to the situation in which an inspector performs an inspection at the site while listening to the impact sounds. That is, when checking the impact sounds at the site, it is effective to listen to the changes in the impact sounds by continuously impacting while changing the impact position. According to the above configuration, it is possible to continuously select and specify (such as by clicking on the image) any position where you want to listen to the impact sounds, just like in the case of impact work at the site, and listen to the output impact sounds. That is, since there is no need to search for and select the position where the impact sounds are recorded, it is possible to continuously listen to the impact sounds while shifting the position you want to impact, and it is possible to accurately listen to the changes in the impact sounds. The hammering sound output is the hammering sound at the closest position, so there is no risk of significantly reducing the accuracy of the hammering inspection, and by closely recording the hammering sound data, the accuracy can be easily improved. As described above, it is possible to output hammering sounds at any position, and since the hammering sounds can be output by clicking on the image, etc., it is possible to output hammering sounds at a higher speed than by striking while moving the position on-site, and the inspection accuracy is higher.

[0011] The invention described in claim 2 is the hammering inspection method described in claim 1, The image display step is characterized in that the striking position at which the striking sound was recorded is displayed on the image of the inspection target area.

[0012] According to this configuration, when listening to the hitting sound reproduction sound at any position, the position where the hitting sound is actually recorded is displayed on the image, so that the user can select and designate the position where the hitting sound is desired to be output while referring to the actual hitting position. This allows the user to listen to the hitting sound while recognizing the sense of distance between the selected position and the actual hitting position, and makes it possible to more accurately judge the quality of the hitting sound based on the hitting sound.

[0013] The invention described in claim 3 is the hammering inspection method described in claim 1 or 2, In the hammering sound recording step, an image of the inspection target area acquired when recording the hammering sound is recorded, The image display step is characterized in that an image of the inspection target area when the hitting sounds are recorded is displayed on the display unit.

[0014] According to this configuration, when a striking position is specified from an image of the inspection target area displayed on the display unit at a location away from the site and striking sounds are output, the image of the inspection target area at the time the striking sounds were recorded is displayed, so that the deterioration state of the existing structure can be judged based on an auditory evaluation from the striking sounds as well as a visual evaluation from the image. This allows the deterioration state of the existing structure to be inspected with higher accuracy.

[0015] The invention described in claim 4 is the hammering inspection method described in claim 1 or 2, The image display process is characterized in that a wide-area image of the existing structure which includes the area to be inspected as a part of it and a mark indicating the location of the area to be inspected on the wide-area image are displayed on the display unit, and when the user selects the mark, an image of the selected area to be inspected is enlarged and displayed on the display unit.

[0016] According to this configuration, the inspection target area can be easily found by displaying a mark indicating the location of the inspection target area from the wide-area image of the existing structure displayed on the display unit, and further, by selecting the mark, the inspection target area where the hammering was performed can be enlarged and displayed on the display unit. This makes it possible to select the inspection target area and perform the hammering inspection more smoothly and efficiently in large-scale existing structures.

[0017] The invention described in claim 5 is the hammering inspection method described in claim 2, In the hammering sound recording step, the results of a primary evaluation in which the recorded hammering sounds are evaluated by a machine analysis or an inspector who listens to the hammering sounds on-site to determine whether the hammering sounds are abnormal are recorded for each hammering sound; The image display step is characterized in that the result of the primary evaluation is displayed at a striking position displayed on the image of the inspection target area.

[0018] According to this configuration, in the image display process of the inspection target area, the results of the machine analysis or the primary evaluation of the hammering sounds by an inspector who listened to the hammering sounds on-site are displayed on the image of the inspection target area, so that it is possible to roughly determine which part of the inspection target area is deteriorated. Therefore, in the secondary evaluation stage, which is the subsequent evaluation, evaluation is performed by referring to the recording data of the hammering sounds for the part evaluated as having an abnormal sound in the primary evaluation and the parts nearby, so that it is possible to efficiently perform a highly accurate inspection.

[0019] The invention described in claim 6 is the hammering inspection method described in claim 5, The display of the result of the primary evaluation of the hitting sounds is performed by color-coding the hitting positions on the image of the inspection target area according to whether the hitting sounds are abnormal or not.

[0020] With this configuration, the difference in color displayed at the impact position on the image of the inspection target area makes it easy to visually distinguish between abnormal parts of an existing structure where abnormal sounds are occurring and which are presumed to be deteriorating, and healthy parts where no abnormal sounds are occurring.

[0021] The invention described in claim 7 is the hammering inspection method described in claim 1 or 2, a hitting sound re-recording step of recording a hitting sound produced by hitting the inspection target area after a predetermined period of time has elapsed since the hitting sound recording step, and recording the hitting sound in association with hitting position data identifying the hitting position; a step of comparing a first hitting sound in the hitting sound recording step and a second hitting sound in the hitting sound re-recording step, the first hitting sound being associated with the closest position coordinate in the coordinate system, to determine the deterioration state; The present invention is characterized by comprising:

[0022] According to this configuration, by comparing the first hitting sound recorded at the striking position closest to the inspection target area with the second hitting sound recorded a predetermined period after the first hitting sound, the progress of deterioration can be objectively judged from, for example, changes in the pitch of the hitting sound, changes in the muddiness of the hitting sound, etc. This makes it possible to grasp the deterioration state more accurately.

[0023] The invention described in claim 8 is the hammering inspection method described in claim 7, The deterioration state is determined by comparing the frequencies of the first hitting sound and the second hitting sound.

[0024] According to this configuration, the speed of deterioration can be estimated from the change in frequency between the first and second hitting sounds, and the time when the striking position will need to be repaired can be estimated. This makes it possible to perform highly accurate inspections that take into account the degree of future deterioration, and to repair necessary areas before spalling, cracks, etc. occur in existing structures.

[0025] In order to achieve the above object, the hammering inspection system according to claim 9 comprises: A hammering inspection system for use in the hammering inspection method according to claim 1, an impact position detection unit that detects a position where an inspection target area of ​​an existing structure is impacted by a striking tool; A recording unit that records the hitting sound generated at the hitting position; a storage unit that records the recording data of the striking sound in association with striking position data that identifies the striking position detected by the striking position detection unit, and records an image of the inspection target area associated with a coordinate system that identifies each position of the existing structure; an input unit for accepting data input from a user; a display unit that displays an image of the inspection target area stored in the storage unit; a sound output unit that outputs the recording data of the hitting sounds recorded in the storage unit; a control unit that, when a point at which a hitting sound is desired to be output is selected and designated by the input unit from the image of the inspection target area displayed on the display unit, outputs recording data of the hitting sound at a position closest to the designated point to the sound output unit; The present invention is characterized by comprising:

[0026] According to this configuration, when an inspection target area of ​​an existing structure is hit with a striking tool by a worker or a self-propelled striking device, the sound recording data of the striking sound generated at the striking position is recorded in the storage unit, linked to the striking position data detected by the striking position detection unit. After that, when the user is in a location away from the site, from the image of the inspection target area displayed on the display unit, selects and designates a point at which the striking sound is desired to be output using the input unit, and the sound recording data of the striking sound at the position closest to the designated point is output from the sound output unit. As with striking work at the site, the user can continuously select and designate any position at which the user desires to listen to the striking sound, and listen to the output striking sound. This makes it possible to perform an effective striking inspection in a location away from the site where the existing structure is located, using a method similar to the situation of actually striking and listening to the striking sound at the site. Effect of the Invention

[0027] According to the hammering inspection method and hammering inspection system of the present invention, even if a location for which hammering data is not available is selected on the image of the inspection target area displayed on the display unit, recorded data of the hammering sound at the nearest position is output, making it possible to check the hammering sounds at any position. This enables the inspector to carry out an effective hammering inspection even if he is in a location away from the site, using a method that approximates the situation of listening to the hammering sounds while actually striking the target on site. [Brief description of the drawings]

[0028] [Figure 1] 1 is a schematic configuration diagram of a hammering inspection system according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic explanatory diagram of a data acquisition unit of the hammering inspection system. [Diagram 3] FIG. 2 is a schematic explanatory diagram of a user interface device of the hammering inspection system. [Figure 4] FIG. 1 is a flowchart of a hammering inspection method according to an embodiment of the present invention. [Diagram 5] FIG. 13 is a diagram illustrating an image of an existing structure displayed on a display unit. [Figure 6] 4A and 4B are diagrams illustrating an image of an inspection target area displayed on a display unit. [Figure 7A] 13A and 13B are diagrams for explaining how a point on an image of an inspection target area is selected and designated with a cursor; [Figure 7B] FIG. 13 is an explanatory diagram of a database of impact position data and recorded data of impact sounds associated with an image of an area to be inspected. [Figure 8] FIG. 11 is a flowchart of a hammering inspection method according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, a hammering inspection method and a hammering inspection system 10 according to an embodiment of the present invention will be described with reference to the drawings. The hammering inspection method is a method for inspecting the deterioration state of an existing structure 40 by using hammering sounds generated by striking an inspection target area of ​​the existing structure 40. The hammering inspection system 10 according to an embodiment of the present invention is a system used for striking the surface of an existing structure (for example, a concrete structure constructed using concrete) with an inspection striking tool and inspecting the deterioration state of the existing structure by the hammering sounds generated by this striking. As shown in FIGS. 1 to 3, the hammering inspection system 1 of this embodiment includes an inspection data acquisition device 10 for acquiring hammering data and the like at a site where the existing structure 40 exists, and a user interface device 20 used by an inspector 44 to evaluate the hammering sounds based on the acquired hammering sound data. Note that FIG. 2 is a schematic explanatory diagram of the inspection data acquisition device 10 of the hammering inspection system 1, and shows a state in which a worker 42 is striking the wall surface of the existing structure 40 with a striking tool 11 at a site where the existing structure 40 exists. FIG. 3 is a schematic diagram of the user interface device 20 of the hammering inspection system 1, and shows an inspector 44 looking at an image displayed on the display unit 26 at a location away from the site where the existing structure 40 is located.

[0030] As shown in Fig. 1 and Fig. 2, the test data acquisition device 10 includes a striking tool 11, a striking position detection unit 12, a sound recording unit 14, an imaging unit 15, a display unit 16, a control device 18 serving as a control unit, and a communication unit 19. Fig. 1 shows a state in which the control device 18 and the display unit 16 are placed on a mounting table 48. The control device 18 includes a storage unit 17, a striking sound extraction unit 18a, a linking unit 18b, and a striking sound evaluation unit 18c. As shown in Fig. 1 and Fig. 3, the user interface device 20 includes an input unit 22, a sound output unit 24, a display unit 26, a control device 28 serving as a control unit, and a communication unit 29. The control device 28 includes a storage unit 27 and a deterioration rate calculation unit 28a. In the following description, in order to distinguish between the display units 16, 26, the control units 18, 28, the memories 17, 27, and the communication units 19, 29, the display unit 16, memory 17, and communication unit 19 on the inspection data acquisition device 10 side will also be referred to as the first display unit 16, the first control unit 18, the first memory unit 17, and the first communication unit, and the display unit 26, memory unit 27, and communication unit 29 on the user interface device 20 side will also be referred to as the second display unit 26, the second control unit 28, the second memory unit 27, and the second communication unit 29.

[0031] The inspection data acquisition device 10 will be described in detail below with reference to FIGS. The impact tool 11 is a tool that impacts the existing structure 40 to generate impact sounds, and in this embodiment, a hammer is used that is held by the worker 42 and impacts the existing structure 40. Note that the impact tool 11 is not limited to this, and for example, an impulse hammer capable of measuring vibration characteristics, an impact device that impacts using mechanical power, etc. can be used. The impact device can be a self-propelled type or a non-self-propelled type in which the worker 42 moves the impact part, and further, it may be an impact device that is capable of continuous impacts.

[0032] The impact position detection unit 12 detects the position (impact position) at which the impact tool 11 impacts an inspection target area where a hammering test is to be performed in the existing structure 40. The impact position detection unit 12 can be, for example, a position detection sensor that measures the distance and position from the impact position detection device by emitting light or ultrasonic waves and detecting that these are reflected by the impact tool 11. The impact position detection unit 12 may also be configured to capture an image of the inspection target area with an imaging device such as a camera, and detect the impact position from the image of the impact made by the impact tool 11.

[0033] The recording unit 14 records the impact sound generated at the impact position of the inspection target area by the impact of the impact tool 11. The recording unit 14 can be, for example, a microphone that converts sound into an electric signal. The impact sound recorded data converted into an electric signal is recorded in the memory unit 17 of the control device 18. The impact position detection unit 12 and the recording unit 14 each constitute a data acquisition unit that acquires the impact position data and the impact sound recorded data, respectively.

[0034] The imaging unit 15 captures still images and / or videos, and can be configured, for example, with an imaging device such as a camera. The imaging unit 15 is optional, and can be used to obtain an image of the inspection target area as accompanying visual inspection data when obtaining recorded data of the hitting sounds.

[0035] The control device 18 includes, for example, an interface (I / F) for receiving data, a central processing unit (CPU) for executing a control program, a ROM for storing the control program, a RAM used as a work area when the CPU executes processing, and a recording medium for storing various data. The control device 18 is electrically connected to the impact position detection unit 12, the recording unit 14, and the first display unit 16, and is configured to be capable of communicating with these. When the impact tool 11 is an impulse hammer, the impact tool 11 is electrically connected to the control device 18, and data on vibration characteristics can be input to the control device 18.

[0036] The first storage unit 17 stores the input data, and in this embodiment is an internal memory built into the control device 18. Note that the first storage unit 17 may be an external memory externally connected to the control device 18. As the external memory, for example, a hard disk drive (HDD) or a solid state drive (SSD) can be used.

[0037] The first storage unit 17 stores a program for hammering inspection, and records data of an image (wide-area image) showing the entire image and / or a wide area of ​​the existing structure 40. A coordinate system for expressing a position on the existing structure 40 is set for the existing structure 40, and this coordinate system is linked to the image of the existing structure 40 stored in the first storage unit 17. The image of the existing structure 40 is not limited to an image of the actual existing structure 40 captured by an imaging device such as a camera, but may be an image of the existing structure 40 represented by computer graphics. In the following description, this coordinate system is also referred to as a "reference coordinate system." The reference coordinate system can be a three-dimensional coordinate system that indicates position coordinates using, for example, coordinate axes in the X-direction, Y-direction, and Z-direction that are orthogonal to each other. In this embodiment, when the sound recording unit 14 acquires hammering data, an image of the inspection target area captured by the imaging unit 15 is stored in the first storage unit 17.

[0038] The tapping sound extraction unit 18a extracts each tapping sound from the tapping sound data recorded by the recording unit 14, that is, from the recording data including a plurality of tapping sounds struck at a plurality of tapping positions, and records the individual tapping sounds in a divided state in the first storage unit 17 as tapping sound recording data. As the tapping sound extraction process, for example, the time of the tapping by the tapping instrument 11 is extracted, and a sound of a predetermined length (for example, 0.5 seconds) is cut out from a predetermined time before the tapping time (for example, 0.1 seconds before) and extracted as unit tapping sound data. The tapping time can be set as the time when the peak value of the amplitude spectrum in a predetermined frequency range becomes equal to or exceeds a threshold value from the recorded tapping sound data. In addition, when using a tapping device that strikes at regular intervals, if there is a period in which the peak value cannot be detected due to the influence of noise or the like, a tentative tapping timing is extracted at an interval equal to the tapping timing at which the peak value was continuously detected, and the peak value of the amplitude spectrum is detected in the vicinity of this timing, and the time when the peak value is reached is set as the tapping time, whereby the unit tapping sound data can be extracted with high accuracy. In addition, when the impact device strikes the workpiece by the reciprocating motion of a solenoid, the time of impact can be identified by capturing the drive signal of the solenoid and recording it together with a video of the impact work. In addition, an acceleration sensor may be attached to the impact tool to identify the time of impact from the change in acceleration.

[0039] The linking unit 18b links the striking position data of the inspection target area of ​​the existing structure 40 struck by the striking tool 11 with the recording data of the striking sound generated at the striking position. The striking position and the striking sound can be linked, for example, by linking the time when the striking position is detected with the striking sound generated at the striking time. The linked striking position data and the recording data of the striking sound are linked to the position coordinates corresponding to the striking position in the reference coordinate system set in the existing structure 40, and are recorded in the first storage unit 17. The linking unit 18b also links the image of the inspection target area acquired when the striking sound was recorded with a mark indicating the inspection target area displayed on the image of the existing structure 40 acquired in advance. The position of the mark can be set, for example, on the reference coordinate system. The image of the inspection target area linked with the mark is recorded in the first storage unit 17.

[0040] The tapping sound evaluation unit 18c evaluates whether or not each tapping sound divided by the tapping sound extraction unit 18a is an abnormal sound indicating deterioration by mechanical analysis. The tapping sound evaluation unit 18c can evaluate the tapping sound from frequency characteristics, etc., based on a reference sound that is a criterion for determining whether or not the tapping sound is an abnormal sound. The tapping sound evaluation unit 18c may be configured to evaluate the tapping sound acquired by a machine learning program based on teacher data input in advance to evaluate whether or not the tapping sound is an abnormal sound. The tapping sound evaluation unit 18c is optional, and the inspection data acquisition device 10 may not be configured to include the tapping sound evaluation unit 18c.

[0041] The first display unit 16 outputs data etc. so that it can be visually recognized, and may be, for example, a liquid crystal display and / or a head mounted display (HMD) such as VR goggles. The first display unit 16 can display an image of the existing structure 40, an image of the inspection target area captured by the imaging unit 15 when the hammering sound is recorded, etc. Although not shown, it is also possible to connect a sound output unit such as a speaker to the control device 18 and output the recorded hammering sound on-site.

[0042] The first communication unit 19 and the second communication unit 29 of the user interface device 20 transmit and receive data. The control device 20 and the user interface device 20 are configured to be able to transmit and receive data via the first communication unit 19 and the second communication unit 29 in a wired and / or wireless manner.

[0043] Next, the user interface device 20 will be described in detail with reference to FIGS. The input unit 22 receives data from outside the user interface device 20, data input from a user, etc. As the input unit 22, for example, a combination of a mouse 22a, a keyboard 22b, and / or a touch panel, etc., shown in FIG.

[0044] The sound output unit 24 outputs data etc. so that it can be audibly recognized, and for example, an acoustic device such as a speaker or a headphone can be used. In the present embodiment, a speaker is used as the sound output unit 24. As will be described later, in the hammering inspection system 10, the recorded data of the hammering sounds recorded in the second storage unit 27 can be output to the outside by the sound output unit 24.

[0045] The second display unit 26 outputs data etc. so that the data can be visually recognized, and may be, for example, a display device such as a liquid crystal display, a head mounted display (HMD) and / or a projector. The second display unit 26 can display data such as images and numerical data output by a program for hammering inspection executed by the second control device 28.

[0046] The second control device 28 includes, for example, an interface (I / F) for receiving data, a central processing unit (CPU) for executing a control program, a ROM for storing the control program, a RAM used as a working area when the CPU executes processing, and a recording medium for storing various data, and functions as a control unit for controlling the operation of the user interface device 20. The second control device 28 is electrically connected to the input unit 22, the sound output unit 24, and the second display unit 26, and is configured to be able to communicate with these.

[0047] The second storage unit 27 stores the input data, and in this embodiment, it is an internal memory built into the second control device 28, and stores a program for the hammering test. The second storage unit 27 may be an external memory externally connected to the second control device 28. Data transmitted from the test data acquisition device 10 via the first and second communication units 19 and 29 is stored in the second storage unit 27. When the user selects and specifies a point at which the hammering sound is to be output from the image of the test target area displayed on the second display unit 26 by the input unit 22 (i.e., when the position coordinates are selected and specified), the control device 28 outputs the recorded data of the hammering sound at the position closest to the specified point from the sound output unit 24. It is also possible to configure the device not to output the recorded data when the recorded striking position and the selected and specified point are apart by a predetermined distance or more. For example, if there is no recorded impact position within a radius of 10 cm, preferably within a radius of 5 cm, from the designated point, the recorded impact sounds are not output, thereby improving the accuracy of the evaluation of the deterioration state based on the output impact sounds.

[0048] The deterioration rate calculation unit 28a calculates the deterioration rate of the existing structure 40 from two hitting sounds whose data were acquired at different times. In this embodiment, the deterioration rate at approximately the same hitting position on the existing structure 40 is calculated from a first hitting sound whose data was acquired first and a second hitting sound whose data was acquired a predetermined period after the acquisition of the first hitting sound. The identity of the hitting positions is determined by the position coordinates of the reference coordinate system, and approximately the same means not only a perfect match of coordinates but also close position coordinates.

[0049] In the hammering sound inspection system 1 described above, the control device 18 in the inspection data acquisition device 10 and the second control device 28 of the user interface device 20 may be the same computer. In this case, it is possible to eliminate the need for data transmission and reception between the first communication unit 19 and the second communication unit 29. Also, the first display unit 16 and the second display unit 26 may be the same unit.

[0050] Next, the procedure of the hammering inspection method using the hammering inspection system 1 will be described with reference to the flowchart of FIG. First, as shown in Fig. 2, an operator 42 goes to a site where an existing structure 40 exists and strikes an inspection target area of ​​the existing structure 40 with a striking tool 11. At this time, a striking position of the striking tool 11 in the existing structure 40 is detected by a striking position detection unit 12 of the inspection data acquisition device 10, and a striking sound at the time of striking is recorded by a recording unit 14 (data acquisition step S10). In addition, when striking sound data is acquired using the recording unit 14, image data of the inspection target area captured by the imaging unit 15 is input to the control device 18.

[0051] The control device 18 records the hitting sounds by linking them to hitting position data that specifies the hitting position detected by the hitting position detection unit 12 (hitting sound recording step S12). The hitting position data and the hitting sound data are recorded in the first storage unit 17 by linking them to position coordinates corresponding to the hitting position in a coordinate system set in the image of the existing structure 40. The hitting sound recording step can be performed automatically by executing a hitting sound inspection program stored in the control device 18 when detecting the hitting position and recording the hitting sounds at the site where the existing structure 40 is located.

[0052] In this embodiment, when recording the hammering sounds, the imaging unit 15 further images the inspection target area to obtain an image of the inspection target area on the day the hammering sound data was obtained, and the obtained image is linked to a mark indicating the inspection target area, which is set in the reference coordinate system of the existing structure 40, and is recorded in the first storage unit 17. Note that the image of the inspection target area linked to the mark is not limited to an image simply taken of the surface of the existing structure 40 by a camera, but can also include an image of the state of sand after scraping the concrete surface of the existing structure 40, an image of investigating neutralization by spraying a phenolphthalein solution on the concrete surface and coloring the surface, and other images obtained when the deterioration is inspected on site by a method other than hammering sound.

[0053] Data of the existing structure 40 for which the reference coordinate system is set and recorded in the control device 18, striking position data, striking sound data, image data of the inspection target area, etc. are transmitted to the user interface device 20 via the first and second communication units 19, 29. The user interface device 20 stores the received various data in the second storage unit 27.

[0054] As shown in FIG. 3, when an inspector 44 (i.e., a user of the hammering inspection system 10) starts the hammering inspection program of the user interface device 20, the second control device 28 displays an image of the inspection target area of ​​the existing structure 40, to which a coordinate system for identifying each position of the existing structure 40 and the recorded data of the hammering sounds are linked, on the second display unit 26 (image display process S14 of the inspection target area). In this embodiment, as shown in FIG. 5, first, an image 30 of the existing structure 40 (hereinafter also referred to as the existing structure image 30) recorded in the second storage unit 27 is displayed on the second display unit 26. This existing structure image 30 is a wide-area image of the existing structure 40 including the inspection target area. The second control device 28 further displays a mark 32 indicating the location of the inspection target area where the hammering was performed on the displayed existing structure image 30. In FIG. 5, an image 30 of the inside of a subway, which is an example of the existing structure 40, is shown. In this manner, by starting the hammering inspection program incorporated in the second control device 28, it is possible to cause the display unit 26 to display the existing structure image 30 and the mark 32.

[0055] In FIG. 5, a plurality of marks 32-1 to 32-6 are shown on an image 30 of a subway, which is an existing structure 40, displayed on the display unit 26, indicating that there are a plurality of areas to be inspected. Also, in FIG. 5, an inspection area 33-1 indicated by the mark 32-1 is indicated by a virtual line. In the present embodiment, as an example, the marks 32 are indicated by chromatic dots. When the inspector 44 selects one mark 32 from the existing structure image 30 using the input unit 22 of the user interface device 20, the second control device 28 enlarges and displays one inspection area corresponding to the selected mark 32 on the display unit 26. Note that the mark 32 is not limited to this, and may be, for example, a point cloud of a number of striking points indicating the striking position by the striking tool 11. When the mark 32 is a point cloud of striking points, when any position within the range of the inspection area is selected and designated by the input unit 22, the inspection area can be enlarged and displayed. As shown in Fig. 6, in this embodiment, when the mark 32 is selected, an image 36 of the inspection target area acquired when the hammering sounds are recorded is displayed together with an enlarged image 34 (hereinafter also referred to as "inspection target area image 34") of the inspection target area in which the reference coordinate system is set. Furthermore, in this embodiment, the date (year, month, and day) on which the image 36 was acquired is displayed on the display unit 26 together with the image 36. Note that the image 36 of the inspection target area when the hammering sounds are recorded can be configured to be selectable between display and non-display by the input unit 22.

[0056] Next, the inspector 44 uses the input unit 22 to select and designate a point on the displayed inspection target area image 34 where the inspector 44 wishes to output the hammering sound (hammering sound output point designation step S15). The hammering sound output point can be designated by moving the cursor 39 on the inspection target area image 34 to designate a position, as shown in Fig. 6. When the hammering sound output point is designated, the recording data of the hammering sound associated with the position closest to the designated point is output through the sound output unit 24 (hammering sound output step S16).

[0057] Fig. 7A is a diagram for explaining how a point on the inspection target area image 34 at which a hitting sound is desired to be output is selected and designated with a cursor 39, and in the illustrated example, the cursor 39 is moved to designate three points A, B, and C. When point A is selected and designated, the control device 28 outputs a hitting sound determined to be closest to point A from the database shown in Fig. 7B. Similarly, hitting sounds determined to be closest to points B and C are also output.

[0058] The inspector 44 who listens to the hitting sound output from the sound output unit 24 evaluates whether the hitting sound is an abnormal sound or not based on the hitting sound (hitting sound evaluation step S18). The evaluation result can be input to the second control device 28 by the input unit 22 and recorded in the second storage unit 27. When the inspector 44 specifies the hitting sound output point, a symbol or the like indicating the recorded hitting position is not displayed on the inspection target area image 34. However, in the image display step S14, it is also possible to display the recorded hitting position on the inspection target area image 34 and select and specify the hitting sound output point in this state. As an example, in the hitting sound evaluation step S18, in order to eliminate hitting sounds that have not been evaluated, it is also possible to indicate the hitting position where the hitting sound that has not been evaluated exists on the inspection target area image 34 using a symbol such as "x".

[0059] In the above-mentioned hammering inspection method, at a site where an existing structure 40 exists, a worker 42 strikes an inspection target area of ​​the existing structure 40 with a striking tool 11, and the striking position data obtained by striking the inspection target area of ​​the existing structure 40 and the recording data of the striking position are linked to the position coordinates in a reference coordinate system set in an image of the existing structure 40 and recorded in the storage units 17 and 27 of the hammering inspection system 1. An inspector 44 who evaluates the hammering sounds can use the recorded data to perform an inspection in a place away from the site (e.g., an office, etc.) in a manner similar to the situation of performing an inspection while listening to the hammering sounds at the site. That is, an inspector 44 executes a program for hammering inspection stored in the control device 28 of the user interface device 20, and continuously selects and designates any position at which the hammering sounds are desired to be listened to from the inspection target area image 34 displayed on the display unit 26 while shifting the position using the input unit 22, as in the case of striking work at the site, thereby continuously listening to the hammering sounds. In this way, since there is no need to search for and select the position where the hammering sound is recorded, it is possible to perform an effective hammering inspection with a method similar to the situation of listening to the hammering sound while actually performing the hammering at the site. In addition, this allows a skilled inspector 44 with excellent experience and hearing to perform a highly accurate hammering inspection based on the displayed inspection target area image 34 and the reproduced hammering sound without going to the site where the existing structure 40 is located, with a feeling of being at the site. In addition, since the hammering sound can be output by clicking on the image, it is possible to output the hammering sound at a higher speed than the hammering action while moving the position at the site, and it is also possible to accurately listen to the change in the hammering sound. Since the output hammering sound is the hammering sound at the closest position, there is no risk of significantly reducing the accuracy of the hammering inspection, and the accuracy can be easily improved by recording the hammering sound data as densely as possible.

[0060] Furthermore, in the above-described hammering inspection method, by selecting a mark 32 indicating the location of the inspection target area from the existing structure image 30 displayed on the display unit 26, an enlarged image 34 of the inspection target area where the impact was performed with the impact tool 11 can be displayed on the display unit 26. This allows the inspector 44 to grasp the location of the inspection target area in the existing structure 40 with the sensation of being on-site.

[0061] Furthermore, in this embodiment, by selecting the mark 32, the image 36 of the inspection target area when the hammering sound was recorded can be displayed on the display unit 26. This makes it possible to visually evaluate the deterioration state from, for example, water leakage or cracks of the existing structure 40 displayed in the image. For example, if the image 36 at the time of recording the hammering sound includes an image of carbonation investigation by spraying a phenolphthalein solution on the concrete surface of the existing structure 40, or an image of water leakage traces on the concrete surface, the deterioration state can be judged from visual information and added to the evaluation by the inspector 44. In this way, by judging the deterioration state of the existing structure 40 based on the auditory evaluation by hammering sounds and the visual evaluation by the image, the deterioration state can be inspected with higher accuracy.

[0062] In addition, in the image display step S14, since the striking position can be displayed on the inspection target area image 34, the inspector 44 can accurately recognize the striking position where the striking sound was generated. This makes it possible to perform highly accurate inspections, for example, by inspecting the boundary between abnormal sounds and healthy sounds from the accurate striking position.

[0063] Next, another embodiment of the hammering inspection method using the hammering inspection system 1 described above will be described with reference to FIG. 8. The hammering inspection method of this embodiment includes a data acquisition step S10, a primary evaluation step S11, a hammering recording step S12, an image display step S14, a hammering output point designation step S15, a hammering output step S16, a hammering evaluation step 18, a re-recording step S20, and a deterioration rate calculation step S22. In the following description, the data acquisition step S10 is the same as in the previous embodiment, so details are omitted. In addition, in the hammering recording step S12, the image display step S14, the hammering output point designation step S15, the hammering output step S16, and the hammering evaluation step 18 of this embodiment, the same procedures as in the previous embodiment are performed, so descriptions of the similar procedures are omitted and the added procedures are described in detail.

[0064] In the primary evaluation step S11 after the data acquisition step S10, the recording data of the hitting sounds and the data of the hitting position acquired in the data acquisition step S10 are evaluated by mechanical analysis by the hitting sound evaluation unit 18c of the first control device 18 to determine whether the hitting sounds are abnormal sounds. Note that the primary evaluation may be an evaluation by the hearing of the worker 42 who was on-site when the hitting sound data was acquired (i.e., an evaluation by the first inspector) instead of the mechanical analysis.

[0065] In the hammering sound recording step S12, the acquired hammering sound and hammering position data are recorded in the first storage unit 17 in association with the position coordinates corresponding to the hammering position in the reference coordinate system set in the image of the existing structure 40, and the result of the primary evaluation for each hammering sound is recorded in the first storage unit 17 in association with the position coordinates corresponding to the hammering position of the hammering sound. As a result, the hammering sound and the result of the primary evaluation of the hammering sound are recorded in association with the position coordinates corresponding to one hammering position. In addition, in the data acquisition step S10, when an image of the inspection target area at the time of recording the hammering sound is acquired, the image is recorded in the first storage unit 17 in association with the mark 32 indicating the inspection target area. The association process is automatically performed by the hammering sound inspection program stored in the control device 18. These data are transmitted to the user interface device 20 via the first and second communication units 19 and 29.

[0066] 3 and 5, in the image display step S14, the inspector 44 causes the second display unit 26 of the user interface device 20 to display the existing structure image 30 recorded in the second hypochondrium 27 and a mark 32 indicating the location of the inspection target area. The inspector 44 can select one mark 32 from the image 30 using the input unit 22, thereby causing one inspection target area image 34 corresponding to the selected mark 32 to be displayed on the second display unit 26.

[0067] In this embodiment, when the mark 32 is selected, the recorded striking position is displayed on the inspection target area image 34 displayed on the second display unit 26, and the result of the primary evaluation of the striking sound is displayed at this striking position. The result of the primary evaluation of the striking sound is displayed by color-coding the striking position on the image of the inspection target area displayed on the second display unit 26 according to whether the striking sound is an abnormal sound or not. In this embodiment, a colored dot is displayed at the striking position, and the color of this dot is color-coded according to whether the striking sound is normal or abnormal (for example, normal sound is colored blue, and abnormal sound is color-coded red). Note that the result of the primary evaluation is not limited to color coding, and may be in any form that can be visually distinguished, for example, by marking the striking position of normal sound with a circle and the striking position of abnormal sound with a cross. Note that the result of the primary evaluation and the image 36 of the inspection target area at the time of recording the striking sound (see FIG. 6) can be configured to be selectable between display and non-display by the input unit 22.

[0068] In the next tapping sound output point designation step S15, the inspector 44 selects and designates a point from which the inspector 44 desires to output a tapping sound from the displayed inspection target area image 34. The inspector 44 can select the desired output point based on the striking position displayed on the display unit 26 and the result of the primary evaluation. In the tapping sound output step S16, the control device 28 outputs a tapping sound from a position close to the designated point from the sound output unit 24. The inspector 44 (if the primary evaluation is performed by the first inspector, the second inspector) who listens to the output tapping sound evaluates whether the tapping sound is an abnormal sound or not based on the tapping sound, that is, performs a secondary evaluation of the tapping sound (tap sound evaluation step S18). If the primary evaluation of the tapping sound is performed by the first inspector in the primary evaluation step S11, the second inspector 44 who performs the secondary evaluation based on the played tapping sound in the tapping sound evaluation step S18 is preferably a skilled inspector having better experience hearing than the first inspector. The results of the secondary evaluation are input to the second control device 28 by the input unit 22 and recorded in the second storage unit 27. If the results of the primary evaluation and the secondary evaluation differ, it is possible to delete the results of the primary evaluation and overwrite them with the results of the secondary evaluation, or to leave the results of the primary evaluation as history.

[0069] Furthermore, in this embodiment, after a predetermined period of time has elapsed after the hammering sound recording step S12, the inspection data acquisition device 10 records the hammering sound produced by striking the inspection target area of ​​the existing structure 40 with the striking tool 11, and performs a hammering sound re-recording step S20 in which the hammering sound is recorded in the first storage unit 17 in association with striking position data that identifies the striking position. The data acquired in the re-recording step S20 is transmitted to the user interface device 20 via the first and second communication units 19 and 29.

[0070] The deterioration rate calculation unit 28a of the second control device 28 of the user interface device 20 compares the first hitting sound recorded in the hitting sound recording step S12, which is linked to the closest position coordinate in the reference coordinate system, with the second hitting sound recorded in the hitting sound re-recording step S20, based on the data of the hitting position and the hitting sound received in the hitting sound re-recording step S20, to determine the deterioration state. The comparison can be, for example, a comparison of frequencies, and by comparing the frequencies, the speed of deterioration can be estimated, and the time when the hitting position needs to be repaired can be estimated. In the hitting sound inspection system 10 of this embodiment, the deterioration rate is calculated using the deterioration rate calculation unit 28a from the first hitting sound, the second hitting sound, and the change in frequency. The calculation result of the deterioration rate can be displayed on the second display unit 26. The deterioration rate may be displayed numerically, or, for example, a threshold value for the deterioration rate may be set and impact positions with a high deterioration rate, where the deterioration rate is equal to or greater than the threshold, may be color-coded from impact positions with a low deterioration rate, where the deterioration rate is less than the threshold, so that areas with rapid deterioration can be visually identified.

[0071] In addition, the inspector 44 can select the first hitting sound and the second hitting sound after a predetermined period of time, which are linked to substantially the same position coordinates in the reference coordinate system, and output them from the sound output unit 24 by specifying the hitting position from the inspection target area image 34 displayed on the second display unit 26. The inspector 44 can also estimate the part with a high deterioration rate from the first hitting sound and the second hitting sound. For example, the progress of deterioration can be objectively judged from the change in the pitch of the hitting sound or the change in the muddiness of the hitting sound. This makes it possible to grasp the deterioration state more accurately. In addition, the second control device 28 can simultaneously display both the hitting position of the first hitting sound and the hitting position of the second hitting sound on the second display unit 26, and this makes it possible to identify the identity of the hitting positions of the first and second hitting sounds to be compared.

[0072] The deterioration rate calculation unit 28a may be provided in the first control device 18 and configured to transmit the calculation result of the deterioration rate by the deterioration rate calculation unit 28a to the second control device 28. In the flowchart shown in Fig. 6, the hammering sound re-recording step S20 and the deterioration rate calculation step S22 are performed after the hammering sound evaluation step S18, but these may be performed after the hammering sound recording step S12 and after a predetermined period (for example, several months to several years) has passed.

[0073] The hammering inspection method of this embodiment has the same effect as the hammering inspection method shown in Fig. 4, and can improve the inspection accuracy by performing a secondary evaluation by the inspector 44 in addition to a primary evaluation by machine analysis for the same hammering sounds. For example, when the results of the primary evaluation and the secondary evaluation are different, a highly accurate inspection result can be obtained by prioritizing the result of the secondary evaluation by the skilled inspector 44 who has better experience hearing than the machine analysis. In addition, the accuracy of the machine analysis can be improved by feeding back the result of the secondary evaluation to the hammering evaluation unit 18c and having it learn.

[0074] In addition, in the hammering sound inspection method of the present embodiment, the display step S14 displays the results of the primary hammering sound evaluation together with an image of the inspection target area, making it possible to roughly determine which part of the inspection target area is deteriorated. The primary evaluation results are color-coded to show the striking positions of normal sounds and abnormal sounds, so that the inspector 44 can easily visually grasp the abnormal parts of the existing structure 40 where abnormal sounds are generated and deterioration is presumed, and the healthy parts where no abnormal sounds are generated. As a result, in the subsequent hammering sound evaluation step S18, for example, a precise secondary evaluation is performed by the skilled inspector 44 on the parts evaluated as having abnormal sounds in the primary evaluation and their neighboring parts, making it possible to efficiently perform a highly accurate inspection.

[0075] In addition, in the above-mentioned hammering inspection method, the deterioration rate can be calculated from the change (e.g., change in the frequency of the hammering sound) between the first hammering sound recorded in the hammering sound recording step S12 and the second hammering sound recorded in the hammering sound re-recording step S20, which occurs in the inspection target area of ​​the existing structure 40, at a position closest to the striking position of the first hammering sound. For example, the first hammering sound and the second hammering sound are compared, and when the change in the peak frequency of the hammering sound is large, it can be estimated that the deterioration rate is high. In addition, the deterioration rate may be estimated from the change in sound pressure in a predetermined frequency band. By calculating the deterioration rate, it is possible to estimate the time when repairs will be required for the existing structure 40. As an example, it is possible to estimate the time when repairs will be required for the striking position from the period (i.e., time) from the first hammering sound to the acquisition of the second hammering sound, and the change in the peak value of the frequency and / or the change in the frequency spectrum. By calculating the deterioration rate from the hammering sounds in this manner, it is possible to carry out highly accurate inspections that take into account the future deterioration degree of the existing structure 40, and it becomes possible to repair necessary areas before spalling, cracks, etc. occur in the existing structure 40.

[0076] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the invention. [Explanation of symbols]

[0077] 1. Impact sound inspection system 10. Data acquisition device for inspection 11 Striking equipment 12 Impact position detection unit 14 Recording section 17 First memory section 18 Control device 18a Hit sound extraction section 18b Stringing section 18c Impact sound evaluation section 19 First Communications Department 20 User interface device 22 Input section 24 Sound output section 26 Display section 27 Second memory section 28 Second control device 28a Deterioration rate calculation section 29 Second Communication Department 30 Images of existing structures 32 Landmark 34 Image of the area to be inspected 39 Cursor 40 Existing Structures 42 Worker 44 Inspector

Claims

1. A hammering inspection method for inspecting a deterioration state of an existing structure by using hammering sounds generated by striking an inspection target area of ​​the existing structure, comprising: a striking sound recording step of recording the striking sound data in association with striking position data that identifies the striking position; an image display process of the inspection target area, which displays an image of the inspection target area on a display unit, to which a coordinate system for identifying each position of the existing structure and the recorded data of the hammering sounds are linked; a hammering sound output point designation step in which a user selects and designates a point at which the hammering sound is desired to be output on the image of the inspection target area displayed on the display unit; a hitting sound output step of outputting recording data of the hitting sound at a position closest to the designated point when a designated action is performed in the hitting sound output point designation step; A hammering inspection method comprising:

2. 2. The hammering sound inspection method according to claim 1, wherein, in the image display step, the striking position at which the hammering sound was recorded is displayed on the image of the inspection target area.

3. In the hammering sound recording step, an image of the inspection target area acquired when recording the hammering sound is recorded; 3. The hammering inspection method according to claim 1, wherein the image display step displays an image of the inspection target area when the hammering sounds are recorded on the display unit.

4. 3. The hammering inspection method according to claim 1, wherein in the image display step, a wide-area image of the existing structure including the inspection target area as a part thereof and a mark indicating a location of the inspection target area on the wide-area image are displayed on the display unit, and when the user selects the mark, the image of the selected inspection target area is enlarged and displayed on the display unit.

5. In the hammering sound recording step, the results of a primary evaluation in which the recorded hammering sounds are evaluated by a machine analysis or an inspector who listens to the hammering sounds on-site to determine whether the hammering sounds are abnormal are recorded for each hammering sound; 3. The method according to claim 2, wherein in the image display step, the result of the primary evaluation is displayed at a striking position displayed on the image of the inspection target area.

6. 6. The hammering sound inspection method according to claim 5, wherein the result of the primary evaluation of the hammering sounds is displayed by color-coding the striking positions on the image of the inspection target area according to whether the hammering sounds are abnormal sounds or not.

7. a hitting sound re-recording step of recording a hitting sound produced by hitting the inspection target area after a predetermined period of time has elapsed since the hitting sound recording step, and recording the hitting sound in association with hitting position data identifying the hitting position; a step of comparing a first hitting sound in the hitting sound recording step and a second hitting sound in the hitting sound re-recording step, the first hitting sound being associated with the closest position coordinate in the coordinate system, to determine the deterioration state; 3. The hammering inspection method according to claim 1, further comprising:

8. 8. The hammering inspection method according to claim 7, wherein the deterioration state is determined by comparing a frequency of the first hammering sound with a frequency of the second hammering sound.

9. A hammering inspection system for use in the hammering inspection method according to claim 1, an impact position detection unit that detects a position where an inspection target area of ​​an existing structure is impacted by a striking tool; a recording unit for recording the striking sound generated at the striking position; a storage unit that records the recording data of the striking sound in association with striking position data that identifies the striking position detected by the striking position detection unit, and records an image of the inspection target area associated with a coordinate system that identifies each position of the existing structure; an input unit for accepting data input from a user; a display unit that displays an image of the inspection target area stored in the storage unit; a sound output unit that outputs the recording data of the hitting sounds recorded in the storage unit; a control unit that, when a point at which a hitting sound is desired to be output is selected and designated by the input unit from the image of the inspection target area displayed on the display unit, outputs recording data of the hitting sound at a position closest to the designated point to the sound output unit; A hammering inspection system comprising:

Images