JP6555801B2 - Maintenance method for attachments in concrete structures - Google Patents

Description

  The present invention relates to a maintenance method for an attachment attached by an anchor placed in a concrete structure.

  Various attachments such as interior panels and support members are installed on the concrete structure, and maintenance is regularly performed on the attachment state of these attachments. During regular maintenance without replacement of the attachment, a hammering inspection is often performed as a simple inspection method to confirm the integrity of the anchor used to fix the attachment. In regular maintenance, the anchor is driven into a new location and moved, and an attachment is often attached using the new anchor.

  In addition to the anchor that is driven into the concrete structure and supports the attachment during maintenance, a new anchor is placed to reinforce the attachment state of the attachment, It has also been proposed to secure the soundness of the attachment state of the attachment by fixing the attachment using both anchors (see Patent Document 1).

JP 2010-150792 A

  By the way, in the method based on moving the anchor to a new location or additionally placing a new anchor, the reinforcing bars embedded in the concrete structure often hinder the new anchor construction. . Since this reinforcing bar is structurally necessary to ensure the required strength, it is not desirable to cut the reinforcing bar, and it is required to avoid the embedded reinforcing bar in the anchor construction. However, even if a reinforcing bar probe is used to avoid a reinforcing bar failure, an accurate search result is not always obtained, and the frequency of encountering a reinforcing bar failure can only be reduced.

  If a reinforcing bar becomes an obstacle during anchor construction, as a first countermeasure, it may be possible to re-install all the anchors used to fix one attachment, but there is always the possibility of a reinforcing bar failure. ing. As a second measure, re-install only the anchors that actually failed the bar among the multiple anchors used to fix one attachment, and install the anchor bolts on the attachment side. It is conceivable to adjust the position of the drilling hole provided for insertion in accordance with the position of the anchor that has been completed, or to add an adjustment member that accompanies a change in the anchor position. However, in any of the measures, the maintenance work becomes large, and the use limit of the concrete structure and its surroundings is prolonged, and the cost increases. In particular, when there is a need to repair the attachment due to an accident such as a natural disaster or man-made disaster, there is no predetermined repair plan, and an extremely prompt response is required, and the construction period and cost are problematic. Become.

  In the first place, as described above, the anchors are relocated uniformly to new locations, or new anchors are additionally placed because there is a risk of deterioration over time in the already placed anchors. This is because it is difficult to accurately determine sex with appropriate cost and time. That is, when evaluating the soundness of anchors placed on concrete with a large-scale strength confirmation test using a force measuring device, a large amount of cost and time are required, and only the sound test is relied on. In this case, since it depends on the hearing of the inspector, the objectivity is poor and the safety is questioned.

  The present invention is proposed in view of the above problems, and the soundness and safety of an anchor placed on a concrete structure and supporting an attachment are accurately determined at an appropriate cost and time for maintenance work. It aims at providing the maintenance method of the attachment of a concrete structure which can aim at reduction of a required cost and shortening of a construction period.

A method for maintaining a concrete structure attachment according to the present invention includes a first step of removing an attachment attached to a machine-fixed anchor placed in a concrete structure, and a probe for an ultrasonic inspection apparatus. A healthy state in which the ultrasonic wave is brought into contact with the anchor, the ultrasonic wave is transmitted and the reflected wave that is multiply reflected is received, and the ultrasonic inspection apparatus generates and stores the waveform data indicating the attenuation state of the ultrasonic wave from the received reflected wave A second step of collating the set waveform data of the model anchor in a fixed state with the waveform data generated for the anchor and outputting a collation result, and when the collation result satisfies a predetermined criterion, a third step of attaching another new fittings and the fittings or the fittings to the anchor, the ultrasonic inspection apparatus, model anchor and a plurality of kinds of plurality of types The set waveform data of the model anchor corresponding to each combination of the model concrete is stored, and the ultrasonic inspection apparatus is set as the inspection object in the second step or the step before the second step. The anchor type and the concrete type of the concrete structure in which the anchor is placed are input, and the ultrasonic inspection apparatus extracts the set waveform data of the model anchor corresponding to the combination of the input types. In the second step, the set waveform data of the extracted model anchor is collated with the waveform data generated for the placed anchor .
According to this, the integrity of the anchoring state of the anchor can be directly inspected without being interfered by the attachment in a state where the attachment is removed. In addition, ultrasonic nondestructive inspection can objectively evaluate the integrity and safety of anchors placed in concrete structures, and obtain highly accurate and reliable inspection results. In addition, the test result can be obtained immediately in real time. In addition, by using the ultrasonic inspection apparatus, a great amount of cost and time generated when a large-scale strength test apparatus is used becomes unnecessary. Therefore, it is possible to accurately determine the soundness and safety of anchors placed on concrete structures and supporting fixtures with appropriate costs and time, reducing the cost of maintenance work and shortening the construction period. Can be planned. In addition, it is possible to use healthy anchors as they are based on high-precision and high-reliability inspection results, and only to replace anchors with low soundness. It is not necessary to perform the inspection, and it is not necessary to construct an inspection anchor which takes time and cost. From these points, the cost required for the maintenance work can be reduced and the construction period can be shortened. In addition, among various combinations of anchors and concrete, it is possible to evaluate the soundness based on the set waveform data of the model anchor that matches the combination of the specific anchor to be inspected and the specific concrete. It is possible to evaluate the soundness of the anchoring state of a specific anchor placed on the concrete with higher accuracy. Moreover, since it becomes possible to adapt to various combinations of anchors and concrete, versatility can be improved.

In the maintenance method for a concrete structure attachment according to the present invention, in the second step, the ultrasonic inspection apparatus acquires the similarity between the set waveform data and the generated waveform data by the verification, and the ultrasonic inspection The apparatus compares the stored threshold value with the acquired similarity degree, and performs output that can confirm that the threshold condition is satisfied as the collation result when the similarity satisfies the threshold condition. It is characterized by.
According to this, since the ultrasonic inspection apparatus acquires the similarity between the set waveform data and the generated waveform data, a similarity with high objectivity and homogeneity can be obtained. Furthermore, since the ultrasonic inspection device outputs satisfaction of the threshold condition of similarity and automatically distinguishes anchors with high soundness and anchors with low soundness, there is an artificial decision on the soundness of the anchor at the site. It becomes unnecessary, and the soundness evaluation of the anchor can be performed more objectively and reliably. In addition, maintenance work can be made more efficient by eliminating the need for on-site judgment on the integrity of the anchor.

In the maintenance method of a concrete structure attachment according to the present invention, in the second step, the ultrasonic inspection apparatus acquires the similarity between the set waveform data and the generated waveform data by the collation, and the collation result is obtained. The similarity is output.
According to this, since the ultrasonic inspection apparatus acquires the similarity between the set waveform data and the generated waveform data, a similarity with high objectivity and homogeneity can be obtained. In addition, since there is room for artificial determination of anchor health on the site based on the output similarity, anchor health can be evaluated on a flexible basis for individual cases. In addition, since the similarity is obtained by the ultrasonic inspection apparatus, it is possible to reduce the labor of field judgment with respect to the soundness of the anchor and to improve the efficiency of the maintenance work.

The method for maintaining an attachment of a concrete structure according to the present invention is characterized in that, in the second step, the probe of the ultrasonic inspection device is brought into contact with a rear end surface of the sleeve of the anchor to contact the anchor. .

  According to the maintenance method for a concrete structure attachment according to the present invention, the soundness and safety of an anchor placed on the concrete structure and supporting the attachment are accurately determined at an appropriate cost and time, and maintenance is performed. The cost required for the work can be reduced and the construction period can be shortened.

The block diagram of the ultrasonic inspection apparatus used with the maintenance method of the attachment thing of the concrete structure of embodiment by this invention. The figure which shows the correspondence table of anchor classification code-concrete classification code-setting waveform data code. The figure which shows the example of setting waveform data. The perspective view which shows the example of the attachment in which a maintenance is performed. (A)-(d) is sectional explanatory drawing explaining the process of the maintenance method of the attachment thing of the concrete structure of embodiment. The figure which shows three setting waveform data from which frequency differs. (A) is a cross-sectional perspective view of the anchor in a healthy fixed state, (b) is a cross-sectional perspective view of the anchor in an unhealthy fixed state. (A) is a figure which shows the waveform data of the reflected wave which carried out multiple reflection at the time of transmitting the ultrasonic wave of 3 types of different frequency with respect to the anchor of a healthy fixing state, (b) is an anchor of an unhealthy fixing state The figure which shows the waveform data of the reflected wave which carried out multiple reflection at the time of transmitting the ultrasonic wave of 3 types of different frequencies with respect to it.

[Maintenance Method for Attachment of Concrete Structure of Embodiment]
The method for maintaining a concrete structure attachment according to an embodiment of the present invention is performed using the ultrasonic inspection apparatus 10 of FIG. The ultrasonic inspection apparatus 10 includes a control unit 11 including a CPU, a storage unit 12 including a ROM, a RAM, a hard disk, an input unit 13 such as a button and a touch panel, an output display unit 14 such as a liquid crystal display, The sound wave generation unit 15, the ultrasonic transmission / reception unit 16, and the probe 17 electrically connected to the ultrasonic transmission / reception unit 16 are provided. The input unit 13 and the output display unit 14 can be integrated with a touch panel that can input and output.

  The storage unit 12 includes a program storage unit 121 in which a predetermined control program such as an ultrasonic inspection program is stored, and the control unit 11 executes a predetermined process according to the predetermined control program. The storage unit 12 also stores a set waveform data storage unit 122 that stores model anchor setting waveform data in a healthy fixing state, and a threshold value that serves as a reference for whether a degree of similarity, which will be described later, satisfies a predetermined criterion. Threshold storage unit 123.

  In the set waveform data storage unit 122, as shown in FIG. 2, the set waveform data code of the set waveform data of each model anchor is stored so as to correspond to the type of model anchor and the type of concrete, and further stored. Set waveform data is stored corresponding to the set waveform data code. That is, the model anchor setting waveform data is set so as to correspond to each combination of a plurality of types of model anchors and a plurality of types of model concrete, and each of a specific type of model anchor and a specific type of model concrete. The set waveform data is specified corresponding to the combination. A configuration in which the set waveform data corresponding to different types of the model anchor and the model concrete is the same may be included. FIG. 3 shows an example of model anchor setting waveform data. In FIG. 3, the horizontal axis represents time, and the vertical axis represents ultrasonic intensity (echo height).

  The type of model anchor corresponding to the set waveform data and the type of model concrete can be set by an appropriate method.For example, only the model number that defines the outer diameter, material, shape, etc. of the anchor as the type of model anchor, Alternatively, the anchor model number and embedment length may be used, and the model concrete type may be a concrete type, a concrete strength value such as a compressive strength value, or a combination thereof. The types corresponding to these are input or selected on the input screen displayed on the output display unit 14, and the control unit 11 extracts set waveform data corresponding to these inputs.

  Furthermore, the storage unit 12 includes an ultrasonic data storage unit 124 that stores ultrasonic data generated by the ultrasonic generation unit 15, and the control unit 11 receives ultrasonic waves according to an input from the input unit 13. The ultrasonic data in the data storage unit 124 is recognized, and the ultrasonic generation unit 15 generates corresponding ultrasonic waves. In addition, the storage unit 12 includes a matching result storage unit 125. The matching result storage unit 125 includes, for example, model anchor setting waveform data and waveform data generated for the anchor that has been placed, and the matching date and time. These similarities, the history of soundness determination results, and the like are stored.

  The output display unit 14 outputs, for example, an operation screen for ultrasonic inspection processing, a model waveform setting waveform data, a collation result of waveform data generated with respect to the placed anchor, and the like. The ultrasonic transmission / reception unit 16 transmits the ultrasonic wave generated by the ultrasonic wave generation unit 15 to the probe 17 so that the ultrasonic wave is transmitted from the probe 17, and the probe 17 transmits the transmitted ultrasonic wave. The reflected wave is received by the ultrasonic wave transmitting / receiving unit 16.

  The attachment of the concrete structure to be maintained using the ultrasonic inspection apparatus 10 is appropriate as long as it is an attachment attached to a machine-fixed anchor placed in the concrete structure. Supporting members such as panels and cables, building equipment, tunnel interior panels, sound insulation panels, road supporting equipment such as pillars for information display panels, and the like.

  4 and 5A show an interior panel 40 attached to a concrete structure 50 with an anchor 20, a nut 31 as an attachment auxiliary member, and a washer 32 as an example of an attachment to be maintained. The anchor 20 of this example is a machine fixing type that is fixed to the concrete structure 50 by expanding in a perforation 51 provided in the concrete structure 50, and has a tapered extension portion 21 at the tip. A bolt portion 22 and an expandable sleeve 23 provided on the outer periphery of the bolt portion 22.

  The anchor 20 is disposed in the perforation 51 of the concrete structure 50 in a state where the sleeve 23 is disposed rearward from the expansion portion 21, and the sleeve 23 is driven in the direction of the expansion portion 21 to expand the sleeve 23. By fastening the nut 31 via the washer 32 after the panel 40 is arranged at the rear part of the bolt part 22, the sleeve 23 is followed and expanded, so that it is firmly fixed to the concrete structure 50 and the interior panel 40 is fixed. Supports stably.

  And when performing the maintenance method of this embodiment, as shown to Fig.5 (a), (b), the nut 31 currently screwed by the anchor 20 is loosened, and the nut 31 attached to the anchor 20 is shown. The washer 32 and the interior panel 40 are removed. In the conventional maintenance for exchanging the attachment, the portion of the anchor 20 that protrudes outward from the concrete structure 50 is cut, and the anchor 20 is newly placed at another location.

  Further, the type of the anchor 20 to be inspected and the type of concrete of the concrete structure 50 on which the anchor 20 is placed are input to the ultrasonic inspection apparatus 10, and the control of the ultrasonic inspection apparatus 10 is performed accordingly. The unit 11 extracts the model anchor setting waveform data corresponding to the combination of types input from the setting waveform data storage unit 122, and reads the setting waveform data used in the collation.

  Thereafter, as shown in FIG. 5C, the probe 17 of the ultrasonic inspection apparatus 10 is brought into contact with the anchor 20. In this example, the probe 17 is in contact with the rear end surface near the outer peripheral surface of the anchor 20 and is in contact with the rear end surface of the sleeve 23. This contact state includes a case of direct contact and a case where a jelly or other medium provided for ensuring the transmission of ultrasonic waves is interposed.

  In this state, the ultrasonic inspection apparatus 10 outputs the ultrasonic wave generated by the ultrasonic wave generation unit 15 based on the ultrasonic data in the ultrasonic data storage unit 124 to the probe 17 via the ultrasonic wave transmission / reception unit 16. The ultrasonic wave is transmitted from the probe 17 so as to be substantially along the direction in which the anchor 20 is driven. The ultrasonic waves to be transmitted are vertical P waves (burst waves), surface SH waves (pulse waves), surface SV waves (lateral waves), etc., and the frequency is preferably about 2 to 10 MHz. The ultrasonic wave transmitted from the probe 17 is a contact point of the probe 17 and a point where a line extending in the driving direction of the anchor 20 from the contact point collides with the tip part of the anchor 20, in this example, the tip surface or the extension part of the sleeve 23. Multiple reflections are repeated between 21 and 21. The probe 17 receives the reflected waves that are reflected by multiple reflection, and the received reflected waves are taken into the ultrasonic inspection apparatus 10 via the ultrasonic transmission / reception unit 16.

  The control unit 11 of the ultrasonic inspection apparatus 10 generates waveform data indicating the attenuation state of the ultrasonic wave from the captured reflected wave, and sets the model anchor in a healthy fixing state read from the setting waveform data storage unit 122. The waveform data and the waveform data generated for the anchor 20 placed in the concrete structure 50 are collated, and the collation result is output by the output display unit 14.

  In the present embodiment, the control unit 11 collates the set waveform data with the waveform data generated for the anchor 20 placed in the concrete structure 50, so that the set waveform data and the generated waveform data are compared. The similarity is acquired, the threshold stored in the threshold storage unit 123 is compared with the acquired similarity, and when the similarity satisfies the threshold condition such as the threshold or more, the threshold condition is satisfied as a matching result For example, a message indicating that the anchor 20 is in a fixed state is output, and the collation result is stored in the collation result storage unit 125. In addition to the soundness message, the set waveform data and the generated waveform data may be output together on the output display unit 14 so that they can be visually confirmed.

  As the acquisition of the similarity, for example, the difference between the maximum value Px of the reflected wave shown in FIG. 6, the difference in time Qx until convergence, the wave phase phase deviation (maximum time) Rx due to the frequency difference, and the set waveform data are generated. A wave phase phase deviation (convergence point) Sx due to a frequency difference from the waveform data is acquired as a similarity. FIG. 6 shows three set waveform data having different frequencies.

  That is, the difference in the maximum value Px of the reflected wave between the set waveform data and the generated waveform data, the difference in time Qx until convergence between the set waveform data and the generated waveform data, the set waveform data and the generated waveform Waveform phase deviation (maximum time) Rx due to frequency difference between data and waveform phase deviation (convergence time) Sx due to frequency difference between set waveform data and generated waveform data are obtained as similarity. When the threshold values set corresponding to these are all within the threshold values, it is determined that the anchor 20 satisfies the predetermined criterion, that is, the anchor 20 having a healthy fixing state.

  Here, the healthy anchor 20 that is in close contact with the concrete as shown in FIG. 7 (a), and the unhealthy state in which the bite into the concrete as shown in FIG. 7 (b) is not sufficiently fixed. The difference in the waveform data of the reflected wave that has been multiple-reflected with the anchor 20 will be described. The ultrasonic wave transmitted from the probe 17 of the ultrasonic inspection apparatus 10 repeats multiple reflections as indicated by the thick arrows in FIG.

  In the case of the healthy anchor 20, the received ultrasonic wave attenuates rapidly as shown in FIG. 8A, whereas in the case of the unhealthy anchor 20, it is received as shown in FIG. 8B. The attenuation of the ultrasonic wave becomes gradual, and a reception signal reflecting the contact state between the anchor 20 and the concrete, in other words, a reception signal reflecting whether the anchor 20 is firmly hard to concrete can be obtained. Therefore, it is possible to determine a healthy anchor 20 and an unhealthy anchor 20 by using this.

  The example of FIG. 8 shows a case where three types of P waves having different frequencies are simultaneously transmitted and received, and a reflected wave that has undergone multiple reflection is received. The received signal at the healthy anchor 20 becomes maximum at the time when the ultrasonic wave makes one reciprocation at any frequency, and after that, multiple reflections are repeated and the ultrasonic wave is rapidly attenuated. In addition, the received signal at the unhealthy anchor 20 becomes the maximum when the ultrasonic wave makes one reciprocation as in the case of the healthy anchor 10, but the attenuation of the ultrasonic wave that repeats multiple reflections thereafter becomes moderate. Yes.

  Then, when the collation result is output and the collation result satisfies a predetermined standard, that is, when the anchor 20 is in a fixed state, the anchor 20 is replaced with the anchor 20 at the time of periodic maintenance for replacing the attachment. A new interior panel 40 a different from the interior panel 40 is attached, and when the attachment is not required to be replaced, the detached interior panel 40 is attached to the anchor 20.

  In addition, when the anchoring state of the anchor 20 is unhealthy because the matching result does not satisfy the predetermined criterion, in this example, it is possible to confirm that the threshold condition is not satisfied as the matching result without satisfying the threshold value of the similarity. When output is performed, the control unit 11 stores the collation result in the collation result storage unit 125 together with the output. And about the applicable unhealthy anchor 20, it cuts the part which protrudes outside from the concrete structure 50 of the anchor 20, or pulls out the anchor 20, etc., and drills a new part a little apart and newly The interior panel 40a or the interior panel 40 is attached in such a manner that the anchor 20 is driven and supported.

  According to the present embodiment, the soundness of the anchored state of the anchor 20 can be directly inspected without being interfered by the attachment in a state where the attachment is removed. Further, the ultrasonic non-destructive inspection can objectively evaluate the soundness and safety of the anchor 20 placed in the concrete structure 50, and the highly accurate and reliable inspection result. And the test result can be obtained immediately in real time. Further, the use of the ultrasonic inspection apparatus 10 eliminates the great cost and time required when using a large-scale strength test apparatus. Accordingly, it is possible to accurately determine the soundness and safety of the anchor 20 placed on the concrete structure 50 and supporting the attachment with appropriate cost and time, reducing the cost required for maintenance work, Shortening can be achieved.

  In addition, it is possible to use the healthy anchor 20 as it is based on the highly accurate and reliable inspection results, and to perform uniform anchoring and attachments during maintenance by only replacing the anchor 20 with low soundness. There is no need to relocate, and it is not necessary to construct an inspection anchor that requires time and cost. From these points, the cost required for maintenance work can be reduced and the construction period can be shortened.

  Moreover, since the ultrasonic inspection apparatus 10 acquires the similarity between the set waveform data and the generated waveform data, a similarity with high objectivity and homogeneity can be obtained. Furthermore, since the ultrasonic inspection apparatus 10 outputs satisfaction of the threshold condition of the similarity and automatically distinguishes the anchor 20 having high soundness and the anchor 20 having low soundness, an artificial response to the soundness of the anchor in the field is performed. Therefore, the soundness evaluation of the anchor 20 can be performed more objectively and reliably. Moreover, the maintenance work can be made more efficient by eliminating the need for on-site judgment on the soundness of the anchor 20.

  In addition, among various combinations of anchors and concrete, it is possible to evaluate the soundness based on the setting waveform data of the model anchor that matches the specific anchor 20 to be inspected and the specific concrete combination, The soundness of the fixed state of the specific anchor 20 placed on the specific concrete can be evaluated with higher accuracy. Moreover, since it becomes possible to adapt to various combinations of anchors and concrete, versatility can be improved.

[Modifications of Embodiment, etc.]
The invention disclosed in this specification is specified by changing these partial configurations to other configurations disclosed in this specification, in addition to the respective inventions, embodiments, and examples, to the extent applicable. Those that are specified by adding other configurations disclosed in this specification to these configurations, or those that have been identified by deleting these partial configurations to the extent that partial effects can be obtained and specifying them The following modifications are also included.

  For example, in the above-described embodiment, the ultrasonic inspection apparatus 10 compares the stored threshold value with the acquired similarity degree, and confirms that the threshold condition is satisfied as a collation result when the similarity satisfies the threshold condition. However, the ultrasonic inspection apparatus 10 obtains the similarity between the set waveform data and the generated waveform data by collation, and outputs the similarity as a collation result. On the other hand, it is possible to artificially determine and evaluate the soundness of the anchor fixing state in light of a predetermined standard.

  According to the configuration of this modified example, since the ultrasonic inspection apparatus 10 obtains the similarity between the set waveform data and the generated waveform data, a similarity with high objectivity and homogeneity can be obtained and output. Since there is room for artificial judgment on the soundness of the anchor 20 on the site based on the similarity, the soundness of the anchor 20 can be evaluated on a flexible basis with respect to individual cases. In addition, since the similarity is obtained by the ultrasonic inspection apparatus 10, it is possible to reduce the labor of field judgment with respect to the soundness of the anchor 20 and to improve the efficiency of the maintenance work.

  In addition, the ultrasonic inspection apparatus 10 compares the stored waveform data of the model anchor in a healthy fixed state with the waveform data generated for the anchor 20 placed in the concrete structure 50. It is also possible to output as a verification result, and the worker on site can visually check this and determine the soundness.

  In addition, the setting waveform data stored in the setting waveform data storage unit 122 and the like in the present invention is not limited to those stored so as to correspond to the type of model anchor and the type of concrete. It is also possible to adopt a configuration in which only the type is stored, or a configuration in which only single set waveform data is stored.

  INDUSTRIAL APPLICABILITY The present invention can be used when performing maintenance of an attachment such as an interior panel or a support member attached by an anchor placed on a concrete structure.

DESCRIPTION OF SYMBOLS 10 ... Ultrasonic inspection apparatus 11 ... Control part 12 ... Memory | storage part 121 ... Program storage part 122 ... Setting waveform data storage part 123 ... Threshold value storage part 124 ... Ultrasound data storage part 125 ... Collation result storage part 13 ... Input part 14 ... Output display unit 15 ... Ultrasonic wave generation unit 16 ... Ultrasonic wave transmission / reception unit 17 ... Probe 20 ... Anchor 21 ... Extension unit 22 ... Bolt part 23 ... Sleeve 31 ... Nut 32 ... Washer 40, 40a ... Interior panel 50 ... Concrete structure 51 ... perforation

Claims (4)

A first step of removing an attachment attached to a machine-fixed anchor placed in a concrete structure;
The probe of the ultrasonic inspection apparatus is brought into contact with the anchor, the ultrasonic wave is transmitted and the reflected wave that is multiply reflected is received, and the ultrasonic inspection apparatus generates waveform data indicating the attenuation state of the ultrasonic wave from the received reflected wave. A second step of collating the set waveform data of the model anchor in a healthy fixed state generated and stored with the waveform data generated for the anchor, and outputting a collation result;
A third step of attaching the attachment or a new attachment different from the attachment to the anchor when the verification result satisfies a predetermined standard ;
The ultrasonic inspection apparatus stores the setting waveform data of the model anchor corresponding to each combination of a plurality of types of model anchors and a plurality of types of model concrete,
In the second step or the step before the second step, the type of the anchor to be inspected and the type of concrete of the concrete structure in which the anchor is placed are input to the ultrasonic inspection apparatus. The ultrasonic inspection apparatus extracts the set waveform data of the model anchor corresponding to the input combination of types,
In the second step, a method for maintaining an attachment of a concrete structure is characterized in that the set waveform data of the extracted model anchor is compared with the waveform data generated for the anchor that has been placed.   In the second step, the ultrasonic inspection apparatus acquires the similarity between the set waveform data and the generated waveform data by the collation, and the ultrasonic inspection apparatus acquires the stored threshold and the similarity. 2. The concrete structure attachment according to claim 1, wherein, when the similarity satisfies the threshold condition, an output capable of confirming the satisfaction of the threshold condition is performed as the comparison result. Maintenance method of things.   The said 2nd process WHEREIN: The said ultrasonic inspection apparatus acquires the similarity of the said setting waveform data and the produced | generated waveform data by the said collation, and outputs a similarity as the said collation result. Maintenance method for concrete structure attachments. The concrete structure according to any one of claims 1 to 3, wherein, in the second step, the probe of the ultrasonic inspection apparatus is brought into contact with a rear end surface of the sleeve of the anchor to be brought into contact with the anchor . How to maintain attachments.

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