JP6685882B2 - Eddy current flaw detection jig, eddy current flaw detection inspection device, and eddy current flaw detection inspection method - Google Patents

Description

  The present invention relates to a high-altitude measuring jig for eddy current flaw detection inspection, an eddy current flaw detection inspection device, and an eddy current flaw detection inspection method.

  Patent Document 1 describes a pipe outer surface inspection device which is self-propelled on the outer surface of the pipe for inspection of the pipe for flaw detection, wall thickness, and the like.

JP-A-2-19763

  An eddy current flaw detection method, for example, a pulse eddy current flaw detection method is known. This inspection is usually performed by an inspector holding an inspection probe and applying the inspection probe to the inspected part. In some cases, for example, an inspection at a high place that is beyond the reach of the inspector is required. In that case, it is necessary to lay a scaffold for the inspectors to climb, but the construction period and costs are actually a serious problem.

  As another measure, a test probe is attached to the tip of a long rod of, for example, several meters. The inspector can lift the test probe with such an extension rod while in a low place. Therefore, scaffolding is unnecessary. However, in reality, the weight of the extension rod and the inspection probe is relatively heavy, and the workload of the inspector is large. There are also safety concerns such as the inspector falling, the probe falling, and the probe contacting nearby equipment. These disadvantages become more pronounced as the rod is lengthened to inspect higher altitudes.

  One of the exemplary objects of an aspect of the present invention is to provide an inspection technique for performing an eddy current flaw detection inspection at a high place at low cost and more safely.

  According to an aspect of the present invention, there is provided a height measuring jig for performing an eddy current flaw detection on a columnar or wall-shaped structure to be inspected. The high-altitude measuring jig is a pillar that is supported by the structure to be inspected during inspection, and a probe lifting tool that is attached to the pillar and that suspends the eddy current flaw detection inspection probe at a height specified for inspection, Equipped with.

  According to an aspect of the present invention, there is provided an eddy current flaw detection inspection apparatus for performing eddy current flaw detection inspection on a columnar or wall-shaped structure to be inspected. The eddy current flaw detection inspection device is an eddy current flaw detection inspection probe, a high-altitude measuring jig, and a support column which is supported by the structure to be inspected and stands at the time of inspection, and a height specified for the inspection. In addition, a high-altitude measurement jig including a probe lifting tool that suspends the eddy current flaw detection inspection probe is provided.

  According to an aspect of the present invention, there is provided an eddy current flaw detection method for a columnar or wall-shaped structure to be inspected. The eddy current flaw detection method is to install a height measurement jig on the structure to be inspected and hang the eddy current flaw detection probe at a height designated for the inspection using the height measurement jig. And using the eddy current flaw detection probe to perform eddy current flaw detection inspection at the designated height.

  It should be noted that any combination of the above constituent elements and constituent elements and expressions of the present invention that are mutually replaced among methods, devices, systems, etc. are also effective as an aspect of the present invention.

  According to the present invention, it is possible to provide an inspection technique for safely performing an eddy current flaw detection test at high cost at low cost.

FIG. 1 is a front view schematically showing a height measuring jig and an eddy current flaw detection inspection device for eddy current flaw detection inspection according to an embodiment. FIG. 3 is a side view schematically showing a high-altitude measuring jig and an eddy current flaw detector for eddy current flaw detection according to the embodiment. It is a figure which illustrates the structure to which the eddy current flaw detection according to the embodiment is applied. It is a figure which shows schematically the mode which looked at the eddy current flaw detection probe and its operation rope concerning an embodiment with a pedestal from the upper part. It is a flow chart which shows the flow of the eddy-current flaw detection inspection method concerning an embodiment.

  Hereinafter, modes for carrying out the present invention will be described in detail. The configurations described below are examples, and do not limit the scope of the present invention. In the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description. Further, in the drawings referred to in the following description, the size and thickness of each constituent member are for convenience of description, and do not necessarily indicate actual dimensions and ratios.

  1 and 2 are a front view and a side view schematically showing a high-altitude measuring jig and an eddy-current flaw detector for eddy-current flaw-detection inspection according to an embodiment, respectively. FIG. 3 is a diagram illustrating a structure to which the eddy current flaw detection according to the embodiment is applied.

  As an example of the eddy current flaw detection inspection, a pulse eddy current flaw detection inspection method is known. The pulse eddy current flaw detection method is a method in which a pulsed magnetic field is applied to a member from a heat insulating material or a covering material, and the average wall thickness is measured from the time change of the eddy current, and the member can be inspected without removing the covering. . The pulsed eddy current inspection method can be applied to, for example, corrosion inspection of a spherical tank pedestal on a fire-resistant concrete coating, corrosion inspection of tar-impregnated jute winding piping, quayside steel sheet pile corrosion and pier steel column corrosion inspection. . The pulse eddy current flaw detection inspection method is performed as a screening inspection for determining the necessity of more precise inspection.

  Hereinafter, a case where the pulse eddy current flaw detection test is applied to a columnar structure to be inspected such as the column 1 of the spherical tank shown in FIG. 3 will be described as an example. The pedestal 1 includes a fireproof coating material 1a such as concrete, and a structural material such as a steel material embedded therein. Needless to say, the coating material 1a is a non-magnetic material. The base end of the pedestal 1 is fixed to the pedestal foundation 2, and the pedestal foundation 2 is installed on the ground 3. The pedestal 1 is erected vertically upward from the pedestal foundation 2, and a spherical shell 4 serving as a tank is attached to the tip end portion 1b of the pedestal by, for example, welding. The pedestal 1 is covered with a covering material 1a except for the tip 1b of the pedestal. Two pedestal braces 5 that intersect each other are provided between adjacent pedestals 1. The pedestal brace 5 extends obliquely from the base end portion of one pedestal 1 to the upper portion of the other pedestal 1.

  As shown in FIG. 2, the pulse eddy current flaw detection inspection device 6 includes a pulse eddy current flaw detection inspection probe (hereinafter, also simply referred to as an inspection probe) 7, a measurement cable 8, and a control device 9. The inspection probe 7 contains a coil (not shown) for generating a pulsed magnetic field and detecting an eddy current. The measurement cable 8 controls the inspection probe 7 so that the coil control signal output from the control device 9 can be communicated to the inspection probe 7 and the measurement data signal measured by the inspection probe 7 can be communicated to the control device 9. Connect to device 9. Note that the measurement cable 8 is shown by a broken line for easy understanding. The control device 9 is configured to control the inspection probe 7 and calculate and output the structural material thickness distribution of the pedestal 1 from the received measurement data. The control device 9 may select, for example, an inspection condition suitable for the present inspection from a plurality of inspection conditions stored in advance, and control the inspection probe 7 according to the selected inspection condition. The control device 9 may be a general-purpose computer such as a commercially available personal computer in which a pulse eddy current flaw detection inspection program is installed.

  On the surface of the pedestal 1, a plurality of inspection positions are designated in advance. The inspection position is predetermined, for example, by the inspection procedure manual. Alternatively, the inspector may make an appropriate determination according to experience and local circumstances. These inspection positions correspond to the positions where the inspection probe 7 is to be positioned on the surface of the pedestal 1 (more accurately, the surface of the coating material 1a). It should be noted that the mark indicating the inspection position is not actually displayed on the surface of the pedestal 1 (however, such a mark may be displayed). The inspection probe 7 is positioned at a certain inspection position, acquires measurement data at the inspection position, and transmits it to the control device 9. When finished, the inspection probe 7 is moved to the next inspection position. This is repeated until the inspection at all inspection positions is completed.

  In order to inspect the entire pedestal 1, the inspection positions are evenly distributed in the height direction and the circumferential direction of the pedestal 1, respectively. The inspection positions are specified, for example, at regular intervals of several tens of cm in the height direction and at regular angular intervals of several tens of degrees (for example, 45 degrees, 60 degrees, or 90 degrees) in the circumferential direction. At a specific circumferential position, a plurality of inspection positions are lined up in the height direction. In addition, a plurality of inspection positions are lined up in the circumferential direction at a specific height. In this way, a plurality of inspection positions are designated on the surface of the pedestal 1 in a grid pattern.

  The length of the pedestal 1 is usually much higher than the height of the inspector, and is, for example, several meters to ten and several meters. The inspection position is also placed at a high place. Since the inspector on the ground 3 cannot reach the upper part of the pedestal 1, the inspection probe 7 cannot be directly positioned at such a high place. Therefore, as described below, the height measuring jig 10 is used.

  As shown in FIGS. 1 and 2, the high-altitude measuring jig 10 is attached to the support column 12 and the support column 12 which is supported by the pedestal 1 at the time of the inspection and is mounted at the support column 12 to be inspected at the designated height for the inspection. And a probe lifting tool 14 for lifting the probe 7.

  The column 12 is a long, non-self-supporting, rigid member that can be carried, and has one end (hereinafter, also referred to as a base end) arranged on the ground 3 and the other end (hereinafter, also referred to as a tip) at the pedestal 1. It is installed so as to abut. For convenience of description, the portion of the column 12 other than the tip portion 12a is generically referred to as a main body portion 12b. The tip portion 12a may be detachably attached to the body portion 12b with a bolt. In the longitudinal direction of the column 12 (the vertical direction in FIG. 1), the length of the tip portion 12a may be, for example, 20% or less, or 10% or less, or 5% or less of the length of the main body portion 12b.

  The front end portion 12a of the column 12 includes two vertical members 16 and a horizontal member 18 that connects the two vertical members 16 to each other. The vertical members 16 and the horizontal members 18 are made of a non-magnetic non-metallic material such as wood. The vertical member 16 and the horizontal member 18 may be formed of a plastic or resin material.

  While the vertical members 16 and the horizontal members 18 are rigid members, a flexible member, for example, a string member 20 made of a soft resin material is attached between the two vertical members 16 above the horizontal members 18. There is. The string member 20 may be, for example, a nylon rope. The string-shaped member 20 is bridged between the two vertical members 16 substantially in parallel with the horizontal member 18. The string-shaped member 20 can be brought into contact with the surface of the pedestal 1 and deformed according to the surface shape when the front end 12 a of the stanchion 12 is supported by the pedestal 1. This helps stabilize the posture of the column 12.

  The tip portion 12a that directly contacts the pedestal 1 is made of a softer material such as wood or a resin material than the main body portion 12b. Therefore, the column 12 is less likely to damage the column 1. Further, by forming the tip portion 12a with such a non-magnetic material, it is possible to reduce or prevent a magnetic adverse effect on the inspection at the inspection position close to the tip portion 12a.

  The main body portion 12b of the column 12 includes two vertically extending vertical columns 22 and a plurality of horizontal members 24 that connect the two vertical columns 22 to each other. The main body portion 12b of the column 12 may be a commercially available twin ladder. The vertical columns 22 and the horizontal members 24 of the main body portion 12b may be made of metal such as aluminum alloy. Each vertical member 16 of the tip portion 12a is fixed to the tip of each vertical column 22.

  By constructing the support column 12 in a ladder shape in this manner, the self-supporting stability of the support column 12 is enhanced as compared with the case where there is only one vertical column. Further, by extending and contracting the vertical column 22, the column 12 can be adjusted to an appropriate length according to the total height of the column 1. The vertical column 22 may be foldable. If the support column 12 is shortened when the height measuring jig 10 is not used and is conveyed, it is convenient for storing and conveying the height measuring jig 10.

  It is not necessary for an inspector to climb the support column 12 when using the height measuring jig 10. It is not essential that the columns 12 be ladder-shaped. The column 12 may have only one vertical column, or may have three or more vertical columns. The pillar 12 may have at least one cross member. The columns 12 may be non-stretchable or non-foldable.

  The probe hoisting tool 14 includes a hoisting rope 26 that hoists the inspection probe 7, and a support tool 28 that is attached to the column 12 and that supports the hoisting rope 26 so that the hoisting height of the test probe 7 can be adjusted. . For the sake of easy understanding, the hoisting rope 26 is shown by a chain line.

  One end of the lifting rope 26 is attached to the inspection probe 7. A probe attachment hook (not shown) may be provided at one end of the lifting rope 26, and the inspection probe 7 may be attached thereto. The other end (hereinafter, also referred to as an operation end) of the lifting rope 26 is a low place near the ground 3 (for example, a height within a reach of an inspector of 2 m or less or 1.5 m or less). Or place 1m or less).

  The support tool 28 is attached to the distal end portion 12 a of the column 12, for example, the string-shaped member 20. The support tool 28 has a pulley 28 a that guides the lifting rope 26. The hoisting rope 26 reaches the pulley 28a from the inspection probe 7 and is bent by the pulley 28a toward the base end portion of the height measuring jig 10.

  Therefore, the inspection probe 7 can be moved upward in the height direction of the pedestal 1 by pulling the operation end of the hoisting rope 26 downward (see arrow A in FIG. 2). On the contrary, the inspection probe 7 can be moved downward in the height direction of the pedestal 1 by moving the operating end of the hoisting rope 26 upward (see arrow B in FIG. 2). In this way, the inspector can easily move the inspection probe 7 to the designated height for inspection by operating the lifting rope 26.

  The height measuring jig 10 is attached to the hoisting rope 26 and includes a length measuring device for measuring the hoisting height of the inspection probe 7, for example, a rope counter 30. The hoisting rope 26 is inserted through the rope counter 30 in advance. The rope counter 30 is configured to display the length of the hoisting rope 26 that has been drawn in (or the hoisting rope 26 that has been drawn out). The inspector can grasp the lifting height of the inspection probe 7 by reading the numerical value displayed on the rope counter 30.

  The rope counter 30 is installed on the main body portion 12b of the column 12. The rope counter 30 is arranged at a low place like the operation end of the lifting rope 26 so that the inspector can easily see the length display. For example, the rope counter 30 is attached to one of the horizontal members 24 (for example, the horizontal member 24 closer to the base end portion than the front end portion 12a of the column 12).

  The rope counter 30 may be provided with a reset switch for resetting the length display. The reset switch may be operated by the inspector when the inspection probe 7 is in a so-called ground cutting state (the inspection probe 7 is lifted so as to be slightly separated from the ground 3). Alternatively, the reset switch may be operated by the inspector when the inspection probe 7 is in the uppermost position.

  A rope winding pipe 32 and a rope stopper 34 are provided on the main body portion 12b of the column 12. The rope winding pipe 32 is attached below the rope counter 30, and the rope stopper 34 is attached below the rope winding pipe 32. The rope-wound pipe 32 projects laterally from the vertical column 22 so that the hoist rope 26 can be wound. The rope stopper 34 is attached to the vertical column 22, and the lifting rope 26 is previously inserted through the rope stopper 34. The rope stopper 34 is configured to switch between a fixed state in which the lifting rope 26 is fixed and an operable state in which the lifting rope 26 is allowed to pass.

  When moving the inspection probe 7 in the height direction, the rope stopper 34 is switched to the operable state. Further, the operation end of the lifting rope 26 is unwound from the rope winding pipe 32. In this way, the inspector can move the operating end of the lifting rope 26 up and down. When the inspection probe 7 is at a desired height or when it is prohibited to move the inspection probe 7 up and down, the inspector winds the lifting rope 26 around the rope winding pipe 32 and fixes the rope stopper 34 in a fixed state. Switch to. In this way, it is possible to prevent the inspection probe 7 from being accidentally displaced or dropped.

  In addition to the lifting rope 26, an auxiliary rope 36 that connects the inspection probe 7 to the support 12 may be provided. This is shown in FIG. One end of the auxiliary rope 36 is attached to, for example, the tip portion 12 a of the column 12, and the other end is attached to the inspection probe 7. The auxiliary rope 36 is provided to give redundancy to the protection of the inspection probe 7. Even if the lifting rope 26 breaks, the auxiliary rope 36 can prevent the inspection probe 7 from colliding with the ground 3.

  The high-altitude measuring jig 10 includes a fixture for attaching the support 12 to the pedestal 1, for example, a fall prevention chain 38. The fall prevention chain 38 is attached to the tip of the height measuring jig 10 in a ring shape. For example, the tipping prevention chain 38 is detachably attached to each of the two vertical members 16 of the tip portion 12a at both ends thereof. The fall prevention chain 38 may be a commercially available yellow plastic chain. The fall prevention chain 38 is hung between the two vertical members 16 so as to pass the pedestal 1. This helps to keep the stanchion 12 in contact and proximity to the pedestal 1. The fall prevention chain 38 can prevent the height measuring jig 10 from falling over, which may occur, for example, in a strong wind.

  The high-altitude measuring jig 10 is equipped with a fixture, for example, a fixed rope 40, for attaching the support column 12 to surrounding structures. One end of the fixed rope 40 is attached to the column 12 (for example, the vertical column 22 of the main body portion 12b). The fixed rope 40 may be provided for each vertical column 22. The other end of the fixed rope 40 is attached to another pedestal 1 (for example, the pedestal 1 adjacent to the pedestal 1 to be inspected) or the pedestal brace 5. This also helps prevent the height measuring jig 10 from falling.

  Further, the height measuring jig 10 includes an operation tool for bringing the inspection probe 7 into contact with the surface of the pedestal 1, for example, a set of operation ropes 42. One of the two operation ropes 42 is attached to one side of the inspection probe 7, and the other operation rope 42 is attached to the opposite side of the inspection probe 7. The two operation ropes 42 extend from the inspection probe 7 to the ground 3 or a low place in the vicinity thereof so as to sandwich the pedestal 1. The inspection probe 7 can be brought into contact with the surface of the pedestal 1 by the inspector holding the operation rope 42 and pulling it toward himself.

  FIG. 4 is a diagram schematically showing the inspection probe 7 and its operating rope 42 according to the embodiment as viewed from above together with the pedestal 1. As shown, the pedestal 1 has a circular horizontal cross section. The pedestal 1 is a cylinder and has a curved surface (specifically, a cylindrical surface).

  The inspection probe 7 has a flat probe surface 7 a facing the curved surface 46 of the pedestal 1. When the inspector pulls the inspection probe 7 to the pedestal 1 with the operation rope 42, if the flat probe surface 7a hits the curved surface 46 with one line, the inspection probe 7 swings left and right around the contact line. You can. It is not preferable that such a swing occurs in the inspection probe 7 during the inspection.

  Therefore, the inspection probe 7 is provided with a probe swing suppressing portion 44 that makes the inspection probe 7 stand still with respect to the curved surface 46 of the pedestal 1 by contact with the curved surface 46 of the pedestal 1. The probe rocking | swiveling suppression part 44 has a set of convex part 48 formed in the probe surface 7a so that it may be symmetrical with respect to the center line 7b of the test probe 7. Each protrusion 48 is a linear protrusion extending in the height direction of the pedestal 1 on the probe surface 7a. The two protrusions 48 have the same protrusion height from the probe surface 7a. The convex portion 48 may be a plurality of small protrusions arranged in the height direction of the pedestal 1 on the probe surface 7a.

  Each convex portion 48 is formed on the probe surface 7 a by a hollow pipe member fixed to the inspection probe 7. The hollow pipe member is tied to the inspection probe 7 so as to extend in the height direction of the pedestal 1 on the probe surface 7a by a string-like member 50 passing through the hollow pipe member. In this way, the hollow pipe member is fixed adjacent to the probe surface 7a. The hollow pipe member may be a so-called vinyl chloride pipe (a pipe made of vinyl chloride resin), and the string-like member 50 may be a tube made of silicone rubber.

  Since the inspection probe 7 hits the curved surface 46 of the pedestal 1 with two lines on the left and right of the center line 7b of the inspection probe 7, it is possible to suppress the oscillation of the inspection probe 7.

  It should be noted that, as shown in the drawing, when the probe swing suppressing portion 44 contacts the pedestal 1, the probe surface 7 a may be separated from the curved surface 46 of the pedestal 1 to some extent. There may be some gap between the probe surface 7a and the surface of the pedestal 1 as long as the inspection probe 7 is in the inspectable range.

  FIG. 5 is a flowchart showing the flow of the eddy current flaw detection method according to the embodiment.

  As a preliminary preparation, the inspector carries the column 12 of the height measuring jig 10 near the pedestal 1 to be inspected, and properly attaches the lifting rope 26 and other accessories to the column 12. For example, the hoisting rope 26 is inserted through the pulley 28a of the support tool 28, the rope counter 30, and the rope stopper 34. When the tip portion 12a of the column 12 is removed, the tip portion 12a is attached to the main body portion 12b. However, at this stage, the inspection probe 7 is not yet attached to the lifting rope 26.

  The inspector installs the column 12 of the height measuring jig 10 on the column 1 (S10 in FIG. 5). The inspector first winds the fall prevention chain 38 around the pedestal 1 with the column 12 lying on the ground 3. The inspector gradually lifts the tip portion 12a along the pedestal 1, and at the same time, gradually brings the base end portion of the column 12 closer to the pedestal 1. In this way, the inspector starts up the height measuring jig 10. The inspector may pull the fixed rope 40 to assist this start-up operation. When the tip 12a of the column 12 has reached the desired height beyond all the inspection positions, the inspector leans the column 12 against the pedestal 1. The struts 12 may be extended if desired. A fixed rope 40 may be attached to the surrounding structure for fixing the column 12. In this way, the column 12 is set on the column 1. In addition, staff or staff may be attached to the pedestal 1 in order to accurately measure the height of the inspection probe 7.

  The inspector attaches the inspection probe 7 to the height measuring jig 10 (S12). The inspection probe 7 is attached to the lifting rope 26. Along with that, the auxiliary rope 36 may be attached to the inspection probe 7. Thus, the installation work of the height measuring jig 10 is completed. Then, the inspection work is started.

  The inspector hangs the inspection probe 7 using the height measuring jig 10 (S14). By operating the lifting rope 26 as described above, the inspector can move the inspection probe 7 upward or downward. The inspector confirms that the inspection probe 7 is at the designated height for the inspection, in other words, at the desired inspection position by referring to the rope counter 30 or by visually inspecting the staff. In that case, the inspector pulls the operation rope 42 to fix the inspection probe 7 at the inspection position. The inspector operates the control device 9 of the pulse eddy current flaw detection inspection device 6 to operate the inspection probe 7 to perform the pulse eddy current flaw detection inspection at the inspection position (S16).

  The vertical movement (S14) and the inspection (S16) of the inspection probe 7 are repeated until all the inspections at a plurality of inspection positions arranged in the height direction at a certain circumferential position are completed. When this is completed, the inspector releases the fixation of the support column 12 once, moves the support column 12 to the next circumferential position, and fixes the support column 12 again. The inspection probe 7 is similarly lifted at the circumferential position, and a plurality of inspection positions arranged in the height direction are inspected. The circumferential movement of the column 12 and the suspension inspection of the inspection probe 7 are repeated until the inspection of all the inspection positions on the surface of the pedestal 1 is completed. When this is completed, the inspector puts away the height measuring jig 10 (S18). In this way, the inspector completes the pulse eddy current flaw detection inspection. It is efficient for multiple inspectors to jointly perform the above work.

  The scaffolding assembled around the pedestal 1 as in the conventional art is usually constructed as a self-supporting structure and is for a worker to ascend and descend, and therefore requires a strength corresponding thereto and a relatively complicated structure. Therefore, when using scaffolding, it takes a certain period and cost. On the other hand, the high-altitude measuring jig 10 uses a portable, non-self-supporting column 12, which is supported by the pedestal 1 during the inspection. Further, it is not necessary for an inspector to climb the height measuring jig 10. Therefore, the height measuring jig 10 may have a simple structure. Therefore, the pulse eddy current flaw detection inspection at a high place can be performed at low cost.

  Further, the inspection probe 7 is suspended from the height measuring jig 10. The inspector can easily move the inspection probe 7 to a designated height for inspection by operating the probe lifting tool 14. The inspection probe 7 is supported by the column 12 during the inspection. Unlike conventional extension bars, the inspector does not have to bear the weight. The work load of the inspector is reduced and the work safety is improved.

  The present invention has been described above based on the embodiments. It is understood by those skilled in the art that the present invention is not limited to the above-described embodiment, various design changes are possible, various modifications are possible, and such modifications are also within the scope of the present invention. By the way.

  The probe hoisting tool 14 of the high-altitude measuring jig 10 may include a rope-shaped member such as a cable, a belt, a chain, or another cord-like object in place of the hoisting rope 26 in order to suspend the inspection probe 7. Good. Similarly, various rope-shaped members can be used for the auxiliary rope 36, the fall prevention chain 38, the fixed rope 40, and the operation rope 42. For easy identification, the lifting rope 26, the auxiliary rope 36, the anti-tip chain 38, the fixed rope 40, and the operating rope 42 may be different from each other in color, material, and / or other properties.

  Instead of the operation rope 42 or the rope-shaped member for operation, the height measuring jig 10 may include other operation tools such as an operation rod. One end of the operation rod is attached to the inspection probe 7, and the other end is defined by the inspector standing on the ground 3 so as to have a full length. The operating rod may be removable from the inspection probe 7. The operating rod may be extendable. The inspector can press the inspection probe 7 against the pedestal 1 by operating the operation rod. As described above, instead of pulling the inspection probe 7 with the operation rope to bring it into contact with the pedestal 1, the inspection probe 7 may be pressed against the pedestal 1 with the operation rod to make contact therewith.

  The shape of the structure to be inspected is not limited to the column. The structure to be inspected may be a columnar structure having a curved surface. The structure to be inspected may be a columnar structure having a flat surface (for example, a prism having a rectangular horizontal cross section such as a rectangle). The probe rocking | fluctuation suppression part 44 of the inspection probe 7 is comprised so that the inspection probe 7 may be made to stand still with respect to the curved surface of a to-be-inspected structure by contact with the curved surface of an inspected structure, or another surface. Good.

  The eddy current flaw detection using the high-altitude measuring jig 10 can be applied not only to a columnar inspected structure but also to a wall-shaped or other inspected structure.

  1 pedestal, 7 inspection probe, 10 high-altitude measuring jig, 12 stanchion, 12a tip part, 14 probe hoisting tool, 22 vertical pillar, 24 horizontal material, 26 hoisting rope, 28 support tool, 30 rope counter, 38 Fall prevention chain, 40 fixed rope, 42 operation rope, 44 probe rocking suppression portion, 46 curved surface.

Claims (9)

A high-altitude measuring jig for performing an eddy current flaw detection inspection on a columnar or wall-shaped structure to be inspected,
A pillar that is supported and supported by the structure to be inspected during inspection,
A probe lifting tool that is attached to the column and that suspends the eddy current flaw detection inspection probe at a specified height for inspection,
An operation tool for bringing the eddy current flaw detection inspection probe into contact with the surface of the structure to be inspected, a height measuring jig.   The height measuring jig according to claim 1, wherein the support column includes two vertical columns that can be expanded or contracted or folded, and a horizontal member that connects the two vertical columns to each other. The probe lifting device,
A rope-shaped member for lifting the eddy current flaw detection probe,
3. A height measuring jig according to claim 1 or 2, further comprising: a support tool that is attached to the support column and that supports the rope-shaped member so that a lifting height of the eddy current flaw detection inspection probe can be adjusted. Ingredient The pillar includes a tip portion formed of a non-magnetic non-metal material, the tip portion being supported by the structure to be inspected,
The height measuring jig according to claim 3, wherein the support of the probe hoisting tool is attached to the tip of the support column.   The height measuring jig according to claim 3 or 4, further comprising a length measuring device attached to the rope-shaped member, the length measuring device measuring a lifting height of the eddy current flaw detection inspection probe.   The height measuring jig according to any one of claims 1 to 5, further comprising a fixture for attaching the support to the structure to be inspected or a surrounding structure. The structure to be inspected has a curved surface,
7. The eddy current flaw detection probe is provided with a probe swing suppressing portion that makes the eddy current flaw detection probe stand still with respect to the curved surface by contact with the curved surface. The high-altitude measuring jig described in any one of 1. An eddy current flaw detector for performing eddy current flaw detection on a columnar or wall-shaped structure to be inspected,
Eddy current inspection probe,
A high-altitude measuring jig,
A pillar that is supported and supported by the structure to be inspected during inspection,
An eddy current flaw detection inspection device, comprising: a height measuring jig including a probe lifting tool that is attached to the support column and that suspends the eddy current flaw detection inspection probe at a designated height for inspection. An eddy current flaw detection method for a columnar or wall-shaped structure to be inspected, which is performed using the eddy current flaw detection inspection apparatus according to claim 8.
Installing the height measuring jig on the structure to be inspected,
Using the height measuring jig, suspending the eddy current flaw detection probe at a specified height for inspection,
An eddy-current flaw detection inspection method comprising: performing an eddy-current flaw detection inspection at the specified height using the eddy-current flaw detection inspection probe.

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