JP5111588B2 - Structural member inspection apparatus and structural member inspection method - Google Patents

Description

  The present invention relates to a structural member inspection apparatus and a structural member inspection method, and in particular, a structural member inspection apparatus capable of efficiently performing a nondestructive inspection of a structural member used for a structure such as a steel tower that supports a power transmission line, The present invention relates to a structural member inspection method.

  The steel tower installed in order to support a power transmission line is comprised by structural members, such as angle iron and a steel pipe. In the case of angle steel, the deterioration status such as corrosion, cracking, rusting, etc. can be observed directly from the outside, but in the case of steel pipe, even if the same deterioration occurs inside the steel pipe, it cannot be directly visually confirmed. .

  For this reason, in order to determine the deterioration status inside the conventional steel pipe, for example, a skilled inspector hits the steel pipe to be inspected with a hammer or the like, and the sound generated by the steel pipe at that time is based on the experience and intuition of the inspector. The method of judging is carried out. However, this method has a problem that the inspection result may vary depending on the skill of the individual inspector. A method is also used in which a fiberscope is inserted inside the steel pipe and the inside is visually inspected. However, the locations that can be diagnosed by a single measurement are limited, and in a short time over a wide range in the axial direction of a long steel pipe. It is difficult to carry out inspection efficiently.

  On the other hand, apart from visual inspection, various methods of nondestructive inspection using ultrasonic waves have been tried. In general, an ultrasonic signal is transmitted from the outer surface of the steel pipe inward in the radial direction, and the time until reception of the reflected wave from the inner surface is measured to obtain the thickness of each part of the steel pipe. In this method, since the time until reception of the reflected wave is shortened in the portion where the thinning has occurred due to the deterioration such as corrosion, it is possible to identify the portion where the deterioration has occurred. However, since the measurement direction is the radial direction of the steel pipe, there is a problem that it is not practical to perform measurement over the entire length of a long steel pipe because the number of measurements is too large.

  In this regard, in recent years, in the maintenance of piping for thermal power plants and the like, application verification of a long-distance inspection method using ultrasonic waves called guide waves has been advanced, and some have already been put into practical use. Guide waves are generally defined as elastic waves that are formed by interference of longitudinal and transverse waves that travel through reflections and mode conversion in an object having a boundary surface such as pipes and plates. The This inspection by the guide wave propagates low-frequency ultrasonic waves with little attenuation in the axial direction of the pipe, and it is assumed that flaw detection in a range of 10 m or more in the pipe axial direction is possible with one sensor.

  For example, in Patent Document 1, in a nondestructive inspection using a guide wave, for the purpose of improving the detection accuracy of the thinned portion, a guide wave is transmitted to the tube body and a guide wave is received from the tube body, Guided wave flaw detector that acquires received information based on the received signal, flaw detection waveform storage device that stores the received information, flaw detection result imaging device that visualizes flaw detection results based on the received information, and flaw detection results Disclosed is a nondestructive inspection apparatus including a flaw detection result diagnosis apparatus that performs a calculation process for identifying a defect signal and a virtual image signal by correlating a plurality of guide wave inspection images for different frequencies visualized by an imaging apparatus. ing.

JP 2010-151490 A

  Although patent document 1 has proposed the structure for raising the measurement precision of the pipe thinning part using a guide wave, in the case of the steel pipe used as a structural member of a power transmission tower, along the longitudinal direction, angle steel Since the members such as diagonal members using stepping bolts, which are used as scaffolding when workers climb up and down the tower, are installed by welding, bolt fastening, etc., when sending a guide wave in the axial direction, In addition to the target locations such as the degradation thinning part, the reflected waves return from these member mounting locations, so it was difficult to accurately extract the degraded locations from the various reflected waves. .

  The present invention has been made to solve the above and other problems, and one object of the present invention is to enable efficient non-destructive inspection of structural members used in steel towers that support transmission lines. A structural member inspection apparatus and a structural member inspection method are provided.

  In order to achieve the above object, one aspect of the present invention is a structural member inspection apparatus for detecting deterioration occurring inside a structural member, wherein ultrasonic waves are applied in a longitudinal direction of the structural member to be inspected. An ultrasonic transmission / reception unit that receives the transmitted reflected wave of the ultrasonic wave, and the structure attached to the structural member, the type of the structure and the distance from the ultrasonic transmission position The structural member attribute data which is data indicating the attribute of the structural member and the structural member identification data which is stored in association with the structural member identification data which is data for mutually identifying the structural member, and the structural member attribute data Reflected wave waveform which is data representing the type of the structure or the deterioration factor generated in the structural member and the waveform of the reflected wave generated by the type of structure or the deterioration factor. A waveform data holding unit that holds data in association with each other, an actual reflected wave waveform that is a waveform of a reflected wave received by the ultrasonic wave transmitting / receiving unit, and the reflected wave recorded in the waveform data holding unit It is determined whether there is a match with the waveform data. If it is determined that there is a match, it is determined whether the type of the structure corresponds to the matched reflected wave waveform data. If it is determined, the distance from the ultrasonic transmission position to the structure that has generated the actual reflected wave waveform is calculated according to the elapsed time from the ultrasonic transmission to the reception of the reflected wave, and the structure data It is determined whether or not there is a match with the distance recorded in the holding unit, and when it is determined that there is a match, the actual reflected wave waveform is caused by the structure attached to the structural member. Yes, before Characterized in that it includes a not a determining reflected wave waveform judgment unit due deterioration occurring in the structural member.

  According to the structural member inspection apparatus and the structural member inspection method according to one aspect of the present invention, it is possible to efficiently perform a nondestructive inspection of a structural member used for a structure such as a steel tower that supports a power transmission line.

It is a figure which shows the condition of the steel pipe test | inspection by the steel pipe test | inspection apparatus 100 which concerns on one Embodiment of this invention. It is a figure which shows the condition of the steel pipe test | inspection by the steel pipe test | inspection apparatus 100 which concerns on one Embodiment of this invention. It is a schematic diagram which shows an example of the reflected wave detected by the steel pipe inspection apparatus. It is a figure which shows an example of the hardware constitutions of the steel pipe inspection apparatus. It is a figure which shows an example of the software structure of the steel pipe inspection apparatus. It is a figure which shows an example of a structure of the data storage part for determination 156. FIG. It is a figure which shows an example of the steel pipe inspection process flow performed by the steel pipe inspection apparatus.

  Hereinafter, the present invention will be described in accordance with an embodiment thereof with reference to the accompanying drawings.

== Overview of steel pipe inspection using guide waves ==
FIG. 1 and FIG. 2 schematically show how a nondestructive inspection of a steel pipe, which is a structural member such as a transmission line tower, is performed using a guide wave. The example of FIG. 1 shows the situation which inspects deterioration of the structural member 10 which comprises the support | pillar of a power transmission line tower, etc. using a guide wave, and the structural member 10 is comprised with the steel pipe 11 (tubular structural member), The steel pipe 10 includes a horizontal member provided between the structural member 10 and a reinforcing member 12 such as a diagonal member, a step bolt 13 used as a scaffold for an operator to raise and lower the structural member 10 at the time of inspection, and the like. However, it is attached by welding, bolt fastening or the like. FIG. 2 shows a cross section of the structural member 10 including the ultrasonic probe unit 20 described later.

  The state of deterioration inside the steel pipe 11 constituting the structural member 10 is inspected using a guide wave. First, the ultrasonic probe unit 20 connected to the steel pipe inspection apparatus 100 is installed in a ring shape so as to surround the steel pipe 11 at an installation position determined in advance for each structural member 10. The steel pipe inspection apparatus 100 is a structural member inspection apparatus according to an embodiment of the present invention, and the configuration and operation thereof will be described later.

  The ultrasonic probe unit 20 is a jig that can be attached to the periphery of the steel pipe 11 in a ring shape, and is configured as a pair of semicircular arc members that can be fixed to each other by appropriate fastening means, for example. . A plurality of ultrasonic probes 30 (eight in the example of FIG. 2) are arranged on the inner surface side of the ultrasonic probe unit 20 in close contact with the outer periphery of the steel pipe 11 at equal intervals. ing.

Ultrasound probe 30, a transmission unit for transmitting the guided waves G _T in the axial direction of the steel pipe 11, and a receiver for receiving the incoming reflected wave G _R that reflected back by the steel tube 11 inside the degraded portion such It is configured as a unit. As described above, since members such as the reinforcing member 12 and the step bolt 13 are attached to the steel pipe 11, not only the deteriorated portion (for example, the reduced thickness due to corrosion) generated inside the steel pipe 11, but also these members. The reflected wave also returns from the mounting portion and is received by the receiving portion of the ultrasonic probe 30. For the purpose of inspecting the deterioration inside the steel pipe, the reflected wave caused by such an attachment member becomes noise.

In the example of FIG. 1, the step bolt 13 and the reinforcing member 12 are attached at positions of distances L ₁ and L ₃ from the attachment position of the ultrasonic probe unit 20, respectively. Further, at a distance L ₂ from the mounting position of the ultrasonic probe unit 20 and that there is thinning portion 14 due to corrosion. In this case, when observing the reflected wave G _R sends a guided wave G _T from the ultrasound probe 30, the reflected wave waveform shown schematically in Figure 3 obtained for example. Figure 3 is an amplitude M on the vertical axis, the horizontal axis represents the time T from the guide wave G _R transmits shows schematically the reflected waveform.

As described above, the distance from the ultrasonic probe 30 increases in the order of the step bolt 13, the thinned portion 14, and the reinforcing member 12, and the reflected waves thereof are within the steel pipe 11 as illustrated in FIG. 3. depending on the distance from the ultrasonic wave sound velocity and ultrasonic probe 30 to propagate, and is received by the guide wave G _T from each transmission time t _1, t _2, t ₃ after the ultrasonic probe 30 . When the physical characteristics of the steel pipe 11, for example, the material, outer diameter, thickness, etc. of the steel pipe 11 are specified, the reflection corresponding to the factors that reflect the guide wave, such as the step bolt 13, the thinned portion 14, the reinforcing member 12, etc. The wave waveform can be specified in advance. Therefore, for members attached to the steel pipe 11 such as the step bolt 13 and the reinforcing member 12, if the reflected wave waveform with respect to the physical characteristics of the steel pipe 11 is recorded by experiments or the like in association with the attachment position, By comparing the actual reflected wave waveform actually obtained by the ultrasonic probe 30 with a method such as pattern matching, it is possible to reliably discriminate the reflected wave from the deteriorated portion such as the thinned portion 14. it can. In addition, for the deteriorated portion where corrosion, cracking, rusting, etc. occur, if the reflected wave waveform with respect to the physical characteristics of the steel pipe 11 is recorded by experiments or the like, it is actually measured by the ultrasonic probe 30. By comparing the actual reflected wave waveform obtained in this way with a method such as pattern matching, it is possible to identify the reflected wave from the deteriorated portion.

== Configuration of Steel Pipe Inspection Apparatus 100 ==
Next, the structure of the steel pipe inspection apparatus 100 of this embodiment is demonstrated with reference to FIGS. 4 is a diagram illustrating an example of a hardware configuration of the steel pipe inspection apparatus 100, and FIG. 5 is a diagram illustrating an example of a software configuration of the steel pipe inspection apparatus 100. As shown in FIGS. 1 and 2, the steel pipe inspection apparatus 100 is connected to an ultrasonic probe unit 20 installed in a steel pipe 11 to be inspected.

  As shown in FIG. 4, the steel pipe inspection apparatus 100 includes a guide wave transmission / reception unit 110 (ultrasonic transmission / reception unit), an A / D conversion unit 120, an input / output interface (hereinafter “input / output I / F”) 130, a processor 141, A memory 142, an auxiliary storage device 143, an input device 144, an output device 145, and a communication interface (hereinafter “communication I / F”) 146 are provided. The input / output I / F 130, the processor 141, the memory 142, the auxiliary storage device 143, the input device 144, the output device 145, and the communication I / F 146 are connected via a bus 147 so as to communicate with each other.

  The guide wave transmission / reception unit 110 is electrically connected to the ultrasonic probe 30 illustrated in FIGS. 1 and 2, and an oscillator that generates a transmission signal for causing the ultrasonic probe 30 to transmit a guide wave. A transmitter including an amplifier, and a receiver that receives an electrical signal (hereinafter referred to as a “reflected wave signal”) based on the reflected wave received by the ultrasonic probe 30.

  The A / D conversion unit 120 has a function of receiving a reflected wave signal obtained from the reflected wave received by the ultrasonic probe 30 from the guide wave transmitting / receiving unit 110 and converting the reflected wave signal into a digital signal. An A / D conversion circuit provided. The converted reflected wave digital signal is transmitted to the input / output I / F 130.

  The input / output I / F 130 includes an input interface unit as an interface circuit that delivers a reflected wave digital signal from the A / D conversion unit 120 to a processor 141 described later, and a guide wave transmission trigger signal from the processor 141 as a guide wave transmission / reception unit 110. And an output interface unit handed over to the transmitting unit.

  The processor 141 is a central processing unit for executing each program for realizing the functions of the steel pipe inspection device 100 described later, and is configured as a CPU (Central Processing Unit), an MPU (Micro Processing Unit), or the like, for example. The memory 142 is a storage medium that stores programs, various tables, and the like, and includes, for example, a RAM (Random Access Memory) and a ROM (Read Only Memory). The auxiliary storage device 143 is a storage medium for storing a program, various determination result data, and the like, and includes, for example, a hard disk drive (Hard Disk Drive, HDD), a semiconductor storage drive (Solid State Drive, SSD), and the like.

  The input device 144 is a user interface for accepting an operation input from a user of the inspection apparatus 100, and includes, for example, devices such as a keyboard, a mouse, and a touch panel. The output device 145 is a data output unit for outputting a user interface screen, determination result data, and the like, and includes, for example, a liquid crystal monitor, a printer, and the like. The communication interface 146 is a part that provides a communication function with other devices, and includes, for example, a NIC (Network Interface Card). Since this inspection apparatus 100 is frequently used in a remote place where a transmission tower is installed, it is desirable that the communication I / F 146 has a wireless LAN function or a data exchange function with a mobile communication network. .

  In general, the input / output I / F 130, the processor 141, the memory 142, the auxiliary storage device 143, the input device 144, the output device 145, and the communication I / F 146 are configured as a mobile computer such as a notebook personal computer (notebook PC). Can do. In that case, the guide wave transmission / reception unit 110, the A / D conversion unit 120, and the input / output I / F 130 unique to the inspection apparatus 100 have a unit structure that can be connected to a notebook PC through an external interface such as a USB (Universal Serial Bus). Can be configured. Of course, the steel pipe inspection apparatus 100 illustrated in FIG. 4 can be integrally configured as a dedicated apparatus.

  In addition, although mentioned later, the operating system (Operating System, OS) which operate | moves with this test | inspection apparatus 100 is not specifically limited to a specific system. For example, Windows (registered trademark) and UNIX (registered trademark) operating systems such as Linux (registered trademark) are preferably used as the OS.

  Next, the software configuration of the steel pipe inspection apparatus 100 of this embodiment will be described. FIG. 5 shows an example of the software configuration of the steel pipe inspection apparatus 100. As shown in FIG. 5, the steel pipe inspection apparatus 100 includes a data I / O unit 151, an OS 152, a measurement management unit 153, a reflected wave waveform determination unit 154, a determination result processing unit 155, and a determination data storage unit 156. Yes.

  The data I / O unit 151 executes data input / output processing between the processor 141 and the input device 144, output device 145, communication I / F 146, and input / output I / F 130 under the control of the OS 152.

  The OS 152 is basic software that provides a basis for data input / output processing by the data I / O unit 151, operations of the measurement management unit 153, the reflected wave waveform determination unit 154, and the determination result processing unit 155. As the OS 152, various kinds of software exemplified above with respect to the hardware configuration of the inspection apparatus 100 can be adopted.

  The measurement management unit 153 is a trigger that instructs the guide wave transmission / reception unit 110 to transmit a guide wave through the input / output I / F 130 after installing the ultrasound probe unit 20 on the structural member 10 (see FIG. 1) to be measured. A process of transmitting a signal, receiving a reflected wave digital signal from the guide wave transmitting / receiving unit 110 through the A / D conversion unit 120, and delivering the data to a reflected wave waveform determination unit 154 to be described later is mainly realized. In addition to this, the measurement management unit 153 performs other data processing (such as time calculation from transmission of the guide wave to reception of each reflected wave) necessary for realizing the function of the steel pipe inspection apparatus 100 of the present embodiment. It can be configured to execute, and what kind of data processing is executed can be appropriately determined according to a design requirement.

  The reflected wave waveform determination unit 154 stores a reflected wave digital signal (actual reflected wave waveform) input through the guide wave transmission / reception unit 110, the A / D conversion unit 120, and the input / output I / F 130 in advance as a determination data storage described later. 6 is a functional block that executes pattern matching processing for performing comparison calculation processing with waveform sample data stored in the unit 156. As will be described later, the waveform sample data is generated when the guide wave is reflected at a structure such as a reinforcing member 12 attached to the steel pipe 11 or the like, a step bolt 13 or a deterioration portion such as corrosion inside the steel pipe 11. Waveform data obtained by sampling the reflected wave is stored. As a pattern matching processing technique, for example, arithmetic processing using a support vector machine is preferably applied. For more information on support vector machines, see, for example, Shotaro Ako, “Kernel Multivariate Analysis”, Iwanami Shoten, November 2008. Of course, other techniques other than the support vector machine may be applied.

  In addition, about each received reflected wave, the reflected wave reception time which is a required time from guide wave transmission to reflected wave reception is calculated and received by the measurement management part 153 with the reflected wave digital signal which shows a reflected wave waveform. Therefore, the reflected wave waveform determination unit 154 can also obtain the distance from the ultrasonic probe 30 to the target object that caused the reflected wave using the reflected wave reception time.

  The determination result processing unit 155 receives the determination result of the reflected wave digital signal by the reflected wave waveform determination unit 154, and inspects the object that caused the reflected wave, the distance to the object, and the like in a predetermined output format. A process of transmitting to the output device 145 or the like of the device 100 is executed.

  Next, the determination data storage unit 156 will be described. FIG. 6 shows an example of the determination data storage unit 156. The determination data storage unit 156 determines what causes the reflected wave received by the guide wave transmission / reception unit 110 is generated, and thereby the structural member 10 including the steel pipe 11 or the like to be inspected. It stores determination data for determining whether deterioration such as corrosion has occurred. The determination data storage unit 156 is set and stored in the memory 142 or the auxiliary storage device 143, for example.

  As shown in FIG. 6, in this embodiment, a structure data table 1561 (structure data holding unit) and a waveform sample data table 1562 (waveform data holding unit) are set in the determination data storage unit 156. It is remembered. The structure data table 1561 is a factor that generates a reflected wave with respect to the guide wave, but is a factor that is distinguished from a deteriorated part, that is, a structure that is attached to the steel pipe 11 in advance such as the reinforcing member 12 and the step bolt 13. Stores data about things. In the structure data table 1561, items of structural member identification data 15611, structural member attribute data 15612, structure type 15613, and distance 15614 are stored in association with each other.

  The structural member identification data 15611 is obtained by classifying structural members constituting a power transmission tower or the like by a unit to be measured and attaching an identification code thereto. For example, as shown in FIG. 6, a steel pipe strut arranged at one corner of a certain power transmission tower “first tower”, the steel pipe at the bottom is named “No. 1 steel pipe” as a unit of measurement object, On the table 1561, it can be recorded as “No. 1 steel tower No. 1 steel pipe”. What is necessary is just to determine suitably how to select a unit measurement object and the naming method.

  The structural member attribute data 15612 records attributes of the structural member specified by the structural member identification data 15611, and in this embodiment, the material, outer diameter, and thickness of the structural member. In the example of FIG. 6, it is a carbon steel pipe that is used for the No. 1 steel tower No. 1 steel pipe, and its outer diameter and wall thickness are 190.7 mm and 7.0 mm, respectively.

  The structure type 15613 represents the type of the structure attached to the structural member specified by the structural member identification data 15611 with an identification code, and is associated with an item of distance 15614 described later. In the example of FIG. 6, “SB (Step Bolt)” (= step bolt) and “BR (BRace)” (= diagonal material) are recorded as the structure type 15613. An identification code can be determined and additionally recorded.

  The distance 15614 records in millimeters how far the structure indicated by the associated structure type 15613 is from the position of the ultrasonic probe 30 at the time of measurement. In the example of FIG. 6, it is shown that the step bolt 13 is attached to the first steel tower No. 1 steel pipe, for example, at a position of 500 mm from the position of the ultrasonic probe 30 at the time of measurement.

  The structure data table 1561 is set for each structural member to be measured before starting the operation of the test apparatus 100 based on design data, repair records, and the like.

  Next, the waveform sample data table 1562 will be described. The waveform sample data table 1562 is a table that records, as a sample, reflected wave waveform data when a guide wave is reflected by various factors for each structural member having a specific attribute. The waveform sample data table 1562 records a factor type 15622 and waveform sample data 15623 in association with each other for each structural member attribute data 15621.

  The structural member attribute data 15621 has the same contents as the structural member attribute data 15612 in the structure data table 1561. The factor type 15622 is an item that identifies the target object that reflects the guide wave. For example, a degradation portion (degradation (crack)) with a crack in the steel pipe 11, a step bolt attached to the steel pipe 11 13 (SB) or the like is recorded. The waveform sample data table 1562 is an item in which waveform sample data of a reflected wave generated when a guide wave is reflected by each factor type 15622 is recorded as a digital value. The reflected wave waveform determination unit 154 includes a guide wave. By comparing the reflected wave waveform data at the time of measurement received from the transmission / reception unit 110 with the waveform sample data, it is possible to specify which factor caused the reflected wave. The waveform sample data 15623 is accumulated in advance by sampling the reflected wave waveform data actually measured by each factor for the structural member specified by the structural member attribute data 15621.

== Explanation of steel pipe inspection processing flow ==
Next, data processing executed by the steel pipe inspection apparatus 100 realized by the above configuration will be described. In FIG. 7, an example of the processing flow performed by the steel pipe inspection apparatus 100 is shown. In FIG. 7, the letter “S” of the reference numerals given to the respective processing steps represents “Step”. As a premise for starting this processing flow, it is assumed that the ultrasonic probe unit 20 is installed at a predetermined position in the steel pipe 11 to be measured.

  First, the measurement management unit 153 of the inspection apparatus 100 has a structure based on structural member identification data 15611 (for example, “No. 1 steel tower No. 1 steel pipe”) that is information specifying a measurement object input from the input device 144 by the measurer. The object data table 1561 is acquired from the determination data storage unit 156 as determination data (S701, S702). At this time, the measurement management unit 153 also acquires the waveform sample data table 1562 associated with the structural member attribute data 15612, 15621.

  Next, the measurement management unit 153 transmits a guide wave transmission trigger signal to the guide wave transmission / reception unit 110 to transmit a guide wave from the ultrasonic probe 30 to the steel pipe 11 (S703). With respect to the transmitted guide wave, a reflected wave is returned from the steel pipe 11 to be measured due to various factors, and these reflected waves are received by the ultrasonic probe 30 and guided wave transmission / reception unit 110, The measurement management unit 153 receives the reflected wave digital signal through the A / D conversion unit 120 (S704).

  The measurement management unit 153 extracts a reflected wave waveform from the received reflected wave (S705). At this time, the measurement management unit 153 compares the amplitude of the received reflected wave with a predetermined threshold value, determines that the portion where the reflected wave amplitude is greater is a reflected wave due to some factor, and extracts the waveform. However, other criteria and other extraction methods may be employed. At this time, the reception time measured from the guide wave transmission is calculated for each extracted reflected wave waveform.

  Next, the reflected wave waveform determination unit 154 of the steel pipe inspection apparatus 100 has the first reflected wave waveform (the waveform of the reflected wave detected earliest after transmission of the guide wave) among the reflected wave waveforms extracted from the measurement management unit 153. (S706), and compared with the waveform sample data 15623 recorded in the waveform sample data table 1562 acquired in S702, the factor type 15622 corresponds to the structure such as the reinforcing member 12 (reference symbol BR). Whether or not (S707). When it is determined that the object corresponds to the structure (S707, Yes), the reflected wave waveform determination unit 154 is recorded in the structure data table 1561 with the time from the guide wave transmission obtained in S705 to the reception of the reflected wave to be determined. Based on the material of the structural member attribute data 15612, the distance from the ultrasonic probe 30 to the structure is calculated, and it is determined whether the corresponding structure that matches the distance 15614 of the structure data table 1561 is recorded. (S708). When it is determined that there is a corresponding structure (S708, Yes), the reflected wave waveform determination unit 154 determines that the reflected wave waveform of the target is a structure registered in advance with respect to the structural member to be measured. Without checking, the measurement management unit 153 checks whether there is a next undecided reflected wave waveform (S712). As used in this specification, the term “match” the numerical values or waveforms includes the case where the numerical values or waveforms to be compared are completely the same and the difference between the two is within a certain allowable range. Shall be.

  When it is determined that there is a next waveform in S712 (S712, Yes), the reflected wave waveform determination unit 154 acquires the next waveform and returns to the structure determination process in S707 (S713). When it is determined that there is no next waveform (S712, No), the reflected wave waveform determination unit 154 records any deterioration / unknown data described later (S714, in this case, since neither is recorded, skip), A series of processing ends.

  On the other hand, when it is determined in S708 that the reflected wave is from the structure but it is determined that there is no corresponding structure in the structure data table 1561 (S708, No), the reflected wave waveform determination unit 154 is determined. Records the data as unknown data (S711), and moves the process to S712. This determination result is considered to occur when, for example, a new structure that was not present when the structure data table 1561 was registered is attached to the structural member. Alternatively, it may also occur when the reflected wave waveform determination unit 154 erroneously determines that it is any structure due to the disturbance of the reflected wave waveform or the like. In any case, in this case, the cause can be clarified by separately investigating unknown data.

  Next, when it is determined in S707 that the waveform sample data 15623 does not correspond to the structure recorded in the waveform sample data table 1562 (No in S707), the reflected wave waveform determination unit 154 displays the target reflected wave waveform. Compared with the waveform sample data 15623, it is determined whether the factor type 15622 matches the waveform sample data 15623 associated with any deterioration (S709). When it is determined that the factor type 15622 matches the waveform sample data 15623 indicating deterioration (S709, Yes), the reflected wave waveform determination unit 154 records the reflected wave waveform as deterioration data (S710), and the process is performed in S712. Move to check if there is an unprocessed next waveform.

  When it is determined in S709 that the factor type 15622 does not coincide with the waveform sample data 15623 indicating deterioration (No in S709), the reflected wave waveform determination unit 154 records the reflected wave waveform as unknown data (S711), and in S712 The process is shifted to check whether there is an unprocessed next waveform.

  When it is determined in S712 that there is no next waveform (No in S712), the degradation data and unknown data recorded in S710 and S711 are transferred to the determination result processing unit 155, and displayed on a monitor in a predetermined output format. An output process is performed and a series of processes are terminated (S714). As this output format, for example, the structural member identification data 15611 (“No. 1 steel tower No. 1 steel pipe”, etc.), the type of reflected wave waveform factor (“deterioration”, “unknown”, etc.), and the position (transmission position) Can be recorded in association with each other, but there is no particular limitation. The factors recorded in this way can be investigated in more detail by performing a conventional ultrasonic flaw detection in the tube diameter direction.

  As described above, according to the present embodiment, the reflected wave from the structure such as the reinforcing member 12 attached to the structural member 10 to be inspected is reflected from the deteriorated portion where the structural member 10 is corroded. Since it can be clearly discriminated from the wave and the deteriorated part can be reliably detected, the nondestructive inspection of the long structure such as the steel pipe 11 can be efficiently carried out.

  In addition, this invention is not limited to said embodiment, A various change is possible in the range which does not deviate from the summary.

DESCRIPTION OF SYMBOLS 10 Structural member (Steel tower etc.) 11 Steel pipe 12 Reinforcement member 13 Step bolt 20 Ultrasonic probe unit 30 Ultrasonic probe 100 Steel pipe inspection apparatus 110 Guide wave transmission / reception part 120 A / D conversion part 130 Input / output interface 141 Processor 142 memory 143 auxiliary storage device 144 input device 145 output device 146 communication interface 151 data I / O unit 152 operating system 153 measurement management unit 154 reflected wave waveform determination unit 155 determination result processing unit 156 data storage unit for determination 1561 structure data table 1562 Waveform sample data table

Claims (6)

A structural member inspection device for detecting deterioration occurring inside a structural member,
An ultrasonic transmission / reception unit that transmits ultrasonic waves in the longitudinal axis direction of the structural member to be inspected and receives a reflected wave of the transmitted ultrasonic waves;
For the structure attached to the structural member, the structural member attribute data and the structural member are identified with respect to the type of the structure and the distance from the ultrasonic transmission position. A structure data holding unit held in association with the structural member identification data, which is data to be
For each of the structural member attribute data, reflected wave waveform data that is data representing the type of the structure or a deterioration factor that occurs in the structural member, and the type of the structure or a reflected wave that is generated due to the deterioration factor; A waveform data holding unit that holds
It is determined whether there is a match between the actual reflected wave waveform that is the waveform of the reflected wave received by the ultrasonic transmission / reception unit and the reflected wave waveform data recorded in the waveform data holding unit. If it is determined that there is a structure type corresponding to the matched reflected wave waveform data, and if it is determined that it is a structure type, the process from ultrasonic transmission to reflected wave reception is determined. The distance from the ultrasonic transmission position to the structure that has generated the actual reflected wave waveform is calculated according to the elapsed time, and it is determined whether there is an object that matches the distance recorded in the structure data holding unit. However, if it is determined that there is a match, the actual reflected wave waveform is caused by the structure attached to the structural member, and is determined not to be caused by deterioration caused in the structural member. And wave waveform judgment unit,
A structural member inspection apparatus comprising: The structural member inspection apparatus according to claim 1,
When the reflected wave waveform determination unit determines whether there is a match between the actual reflected wave waveform and the reflected wave waveform data recorded in the waveform data holding unit, and determines that there is a match, It is determined whether or not the corresponding reflected wave waveform data corresponds to the deterioration that has occurred in the structural member. When it is determined that the deterioration is the deterioration, the actual reflection is determined according to the elapsed time from the ultrasonic transmission to the reception of the reflected wave. A structural member inspection apparatus that calculates a distance from the ultrasonic transmission position to the deterioration factor that has generated a wave waveform, and records the distance as a generation position of the deterioration factor in the structural member. The structural member inspection apparatus according to claim 1,
When the reflected wave waveform determination unit determines whether there is a match between the actual reflected wave waveform and the reflected wave waveform data recorded in the waveform data holding unit, and determines that there is no match The actual reflected wave waveform is determined not to be caused by any of the structure attached to the structural member or a deterioration factor generated in the structural member, and the fact is recorded. Member inspection device. The structural member inspection apparatus according to claim 1,
The structural member is a tubular structural member constituting a structural body that supports an electric wire, and the structural body includes a reinforcing member or a step bolt attached to the structural body. The structural member inspection apparatus according to claim 4,
2. The structural member inspection apparatus according to claim 1, wherein the deterioration factor includes a portion where corrosion, cracking, or rust is generated inside the tubular structural member. A structural member inspection method for detecting deterioration occurring inside a structural member,
In a computer with a processor and memory,
A process of transmitting an ultrasonic wave in the longitudinal axis direction of the structural member to be inspected and receiving a reflected wave of the transmitted ultrasonic wave;
For the structure attached to the structural member, the structural member attribute data and the structural member are identified with respect to the type of the structure and the distance from the ultrasonic transmission position. Processing associated with structural member identification data that is data to be stored,
For each of the structural member attribute data, reflected wave waveform data that is data representing the type of the structure or a deterioration factor that occurs in the structural member, and the type of the structure or a reflected wave that is generated due to the deterioration factor; And associating and holding
It is determined whether there is a match between the actual reflected wave waveform that is the waveform of the reflected wave received by the ultrasonic transmission / reception unit and the reflected wave waveform data recorded in the waveform data holding unit. If it is determined that there is a structure type corresponding to the matched reflected wave waveform data, and if it is determined that it is a structure type, the process from ultrasonic transmission to reflected wave reception is determined. The distance from the ultrasonic transmission position to the structure that has generated the actual reflected wave waveform is calculated according to the elapsed time, and it is determined whether there is an object that matches the distance recorded in the structure data holding unit. However, when it is determined that there is a match, the actual reflected wave waveform is caused by the structure attached to the structural member, and is determined not to be caused by deterioration caused in the structural member. And,
The structural member inspection method characterized by performing this.

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