JP5297338B2 - template - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a marking template capable of correctly marking a mark indicating an area for measuring the wall thickness of a small pipe on a surface of the small pipe. <P>SOLUTION: The marking template 10 includes an arc 12 which is carved along a circle of a small radius r corresponding to the magnitude of a sensor 3a in a state of being opened to one ridge 11 around a position 12a separated from the plate by a distance t1/2 of one half of the thickness t of a pen tip 40a of a marking pen 40 at a right angle from a predetermined position 11a of the ridge 11 of the plate with transparency and flexibility, a first indication line 13 which is cut on a plate below the arc 12 at a right angle to the ridge 11 from the center 12a and indicates the direction of the center position 12a of the arc 12, a first circular hole 14 which is opened in the plate with the small radius r corresponding to the arc 12, and a second indication line 15 which is carved at a right angle at four sides in the radial direction of the first circular hole 14 and indicates the center position 14a of the first circular hole 14. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a template, and more particularly, to a marking template capable of accurately marking a mark indicating a region for measuring the thickness of a small pipe on the surface of the small pipe.

  Pipes installed in nuclear power plants, etc., through which high-temperature and high-pressure water or steam (hereinafter referred to as fluid) flows are used for many years. Erosion (also referred to as erosion) or corrosion due to electrochemical action (also referred to as corrosion) occurs, and the thickness of the pipe decreases with time.

  If the thickness of the pipe decreases, it becomes easier to apply the internal fluid load to the reduced thickness and the pipe itself is more likely to be damaged. Therefore, continuous pipe thickness measurement (also called aging monitoring) This is also an important task for predicting the timing of the breakage.

  As a method for measuring the wall thickness of the pipe, generally, a destructive inspection (method) for measuring the wall thickness of the pipe cut by a caliper or a gauge, and a non-measurement for measuring the wall thickness of the pipe using ultrasonic waves. Destructive inspection (method) is known. Although the destructive inspection can accurately measure the thickness because the pipe is cut, it is not practical when performing aging monitoring, and the non-destructive inspection is mainly performed for the thickness measurement related to aging monitoring.

  In the nondestructive inspection, the pipe thickness can be easily measured without cutting the pipe, but the thickness of the pipe surface to be contacted by the ultrasonic probe as the sensor detection unit (hereinafter referred to as the wall thickness) is to be measured. There is a problem that a thickness measurement error is likely to occur due to a positional deviation of the thickness measurement region, and accurate thickness measurement is difficult.

  As a technique for solving such a problem, Japanese Patent Application Laid-Open No. 2009-109388 (Patent Document 1) discloses a long groove that is cut into at least two locations in a plate and a sensor detection unit that measures an object to be measured. A marking template having a circular hole opened to a size corresponding to the size is disclosed. With this configuration, when performing pipe wall thickness measurement work, a marking template can be placed on the pipe surface by placing a circular hole in a predetermined wall thickness measurement area and placing a linear mark corresponding to the long groove on the pipe surface. No matter how many times it is attached or detached, it is possible to accurately place the marking template at the position where the mark has been once given. That is, by aligning the linear mark and the long groove, it is possible to accurately apply the circular hole of the marking template to a predetermined thickness measurement region without causing a positional shift. Therefore, no matter how many times the work of applying or wiping off the ultrasonic contact medium, rust preventive agent, etc., or removing the annular mark (or circular mark) corresponding to the circular hole, The wall thickness measurement region is specified at the same position, and it is possible to obtain a wall thickness measurement result with high accuracy even if the pipe wall thickness measurement operation is repeated many times. As a result, even if a predetermined period elapses or a measurement person changes, it is possible to continue aging monitoring without reducing the pipe wall thickness measurement accuracy.

JP 2009-109388 A

  However, in the technique described in Patent Document 1, it is necessary to design the shape of the marking template in a cross shape or a T shape corresponding to the circular hole and the long groove. When used for a pipe having a small outer diameter (for example, a pipe having an inner diameter of 20 mm or 25 mm, hereinafter referred to as a small pipe), there is a problem that a linear mark or an annular mark cannot be applied.

  FIG. 5 is a diagram illustrating a usage state of the marking template 60 according to the related art. FIG. 5E1 shows a state in which the marking template 60 according to the prior art is used for a pipe 61 having a large outer diameter (a pipe having an inner diameter of 40 mm or more, hereinafter referred to as a large pipe), and FIG. 5E2 and FIG. The state which is using the template 60 for marking which concerns on a prior art for the small piping 62 is shown. The vertical direction shown in FIG. 5 corresponds to the vertical direction of the marking template 60 according to the conventional technique, and the horizontal direction shown in FIG. 5 corresponds to the horizontal direction of the marking template 60 according to the conventional technique.

  As shown in FIG. 5E1, the large pipe 61 has a small circumferential surface curvature (since the circumferential outer radius of curvature is large), so the measurer can use the marking template 60 (cross-shaped) according to the prior art. The cross-shaped marking template 60 can be easily brought into contact with the surface of the large-sized pipe 61 without greatly bending the marking template 60). For this reason, an annular mark 61b for specifying the thickness measurement region 61a by applying the circular hole 60a of the cross-shaped marking template 60 to the predetermined thickness measurement region 61a, and the annular mark 61b The four linear marks 61c indicating the center position can be accurately applied with the marking pen 61d.

  The four linear marks 61c are composed of two linear marks applied in the vertical direction and two linear marks applied in the horizontal direction. The intersection of the extension line of the linear mark and the extension lines of the two linear marks in the left-right direction just indicates the center position of the thickness measurement region 61a (the center position of the annular mark 61b).

  However, as shown in FIG. 5E2, since the curvature of the surface in the circumferential direction is large in the small pipe 62 (because the radius of curvature of the outer shape in the circumferential direction is small), the measurer determines the curvature of the entire cross-shaped marking template 60. It is necessary to forcibly bend the marking template 60 so as to match the curvature of the surface of the small pipe 62 in the circumferential direction. As shown in FIG. 5E2, even if the measurer forcibly deflects the wing 60a in the vertical direction of the cross-shaped marking template 60, the curvature of the circumferential surface of the small pipe 62 is large. It is understood that the marking template 60 cannot be appropriately bent because the cross-shaped marking template 60 is long in the vertical direction. For this reason, there is a problem that the marking template 60 cannot be brought into contact with the surface of the small pipe 62 and an annular mark or a linear mark cannot be applied to the surface of the small pipe 62.

  Further, for example, instead of the marking template 60 according to the prior art, a commercially available rectangular ruler 63 is used, as shown in FIG. 5E3, two marking pipes 61d in the vertical direction of the small pipe 62 are used. Attempt to make a straight mark. Then, since the ruler 63 bends in the vertical direction, it can be brought into contact with the surface of the small pipe 62, but the ruler 63 does not have a line indicating the direction of the center position of the wall thickness measurement region 61a. There is a problem that the ruler 63 cannot be brought into contact with the thickness measurement region 61a accurately.

  As shown in FIG. 5E3, even if the side 63a of the ruler 63 that is in contact with the ruler 63 can be accurately placed on the center position 61e of the thickness measurement region 61a, the side of the ruler 63 is aligned along the side 63a. When the linear mark 61f is provided with the marking pen 61d, the pen tip of the marking pen 61d has a predetermined thickness, and thus the axial center line 61g of the applied linear mark 61f and the thickness measurement are performed. There is a positional deviation between the center position 61e of the region 61a by an interval of ½ of the thickness. For this reason, the commercially available ruler 63 cannot provide a linear mark indicating the direction of the center position 61e of the thickness measurement region 61a, and provides four linear marks accurately indicating the center position 61e. There is a problem that it cannot be done.

  Accordingly, the present invention has been made to solve the above-described problem, and a marking template capable of accurately marking a mark indicating a region for measuring the thickness of a small pipe on the surface of the small pipe is provided. It is to provide.

  In order to solve the above-described problems and achieve the object, a marking template according to the present invention is formed at a right angle from a predetermined position on one side of a plate material having transparency and flexibility, and the tip of a marking pen is used. An arc engraved in a state of being opened on the one side along a circle having a diameter corresponding to the size of the sensor part of the measuring instrument, centered on a position separated from the plate material by a distance of 1/2 the thickness, A first line indicating the direction of the center position of the arc, engraved on the lower plate of the arc perpendicular to the one side from the center, and the arc opened to the plate. A circular hole having a corresponding diameter, and a second indicating line that is engraved at right angles to the four radial directions of the circular hole and that indicates the center position of the circular hole.

  With this configuration, when carrying out wall thickness measurement work for small pipes, the arc is aligned with the wall thickness measurement area, and the center position of the arc indicated by the first line is located at the center position of the wall thickness measurement area. By aligning the direction, aligning the tip of the marking pen along one side of the marking template, and applying a linear mark, it is easy to create a linear mark that accurately indicates one direction of the center position of the thickness measurement area. Can be applied. Furthermore, it is possible to prevent a positional shift between the axial center line of the linear mark and the center position of the thickness measurement region, which is caused by the thickness of the pen tip of the marking pen. Since the marking template according to the present invention is plate-shaped and has a simple configuration, the marking template can be bent and brought into contact with the surface of a small pipe, which was not possible with the prior art. It becomes possible to accurately mark a straight line on the surface of a small pipe.

  In addition, after applying four linear marks to indicate the center position of the thickness measurement area, if a second line is superimposed on the four linear marks, the thickness measurement area Since the center position coincides with the center position of the circular hole indicated by the second indicating line, when an annular mark having a predetermined diameter is applied to the circular hole, the central position of the annular mark is It becomes possible to match the center position of the thickness measurement region. Therefore, it becomes possible to make the sensor detection part of a measuring device contact | abut correctly to the thickness measurement area | region using the said annular | circular shaped mark. Moreover, even if the annular mark once applied is wiped off, if the annular mark is applied again using the four linear marks, the annular mark will be the same as the one where the previous thickness measurement was performed. Since it is applied to the position of the thickness measurement region, it is possible to obtain a highly accurate thickness measurement result. Furthermore, even if the measurer changes to another measurer, it is possible to continue the aging monitoring without reducing the thickness measurement accuracy of the small pipe by the four linear marks. Since the marking template according to the present invention has a simple configuration, there is no cost.

  In the marking template, at least two or more circular holes are opened in the plate material at intervals corresponding to intervals between a plurality of annular marks provided on the surface of the pipe.

  With this configuration, if the marking template is brought into contact with the surface of the pipe, a plurality of circular holes are located at positions where an annular mark is to be applied to the surface of the pipe. A plurality of annular marks can be continuously formed at predetermined intervals using holes. Therefore, it becomes possible to apply a plurality of annular marks all at once, and it is possible to carry out the thickness measurement operation easily and quickly. In particular, when an annular mark is applied on the surface of a small pipe, the interval between the annular marks to be applied (the preset annular mark) is close, so that the use of the marking template is effective. In particular, the time required for the thickness measurement work can be greatly reduced.

  Further, the marking template is provided with a tapered surface that is inclined inward of the circular hole at a predetermined angle at a peripheral portion of the circular hole.

  With this configuration, if the pen tip of the marking pen is brought into contact with the taper surface, the tip of the pen tip is just guided to the circumferential end of the circular hole. It becomes possible to make the diameter exactly match the predetermined diameter of the circular hole.

  According to the marking template of the present invention, it is possible to apply a linear mark and an annular mark so as to accurately indicate the center position of the thickness measurement region even in a small pipe. It becomes possible to continue the pipe wall thickness measurement work with high accuracy.

It is the top view and AA sectional view taken on the line which show the template for marking which concerns on 1st embodiment. It is a 1st figure which shows the use condition of the template for marking which concerns on 1st embodiment. It is a 2nd figure which shows the use condition of the template for marking which concerns on 1st embodiment. It is the top view which shows the template for marking which concerns on 2nd embodiment, and a BB sectional drawing. It is. It is a figure which shows the use condition of the template for marking which concerns on a prior art.

  Hereinafter, embodiments of a marking template according to the present invention will be described in detail with reference to the drawings. However, the present invention is not limited thereto.

<First embodiment>
FIG. 1A1 is a plan view showing a marking template according to the first embodiment of the present invention, and FIG. 1A2 is a cross-sectional view taken along line AA shown in FIG. 1A1. 1A1 and 1A2 corresponds to the vertical direction of the marking template according to the first embodiment of the present invention, and the horizontal direction illustrated in FIGS. 1A1 and 1A2 is the first direction of the present invention. This corresponds to the left-right direction of the marking template according to the embodiment.

  The marking template 10 according to the first embodiment of the present invention includes an annular mark (or a circular mark) having a predetermined diameter corresponding to the size of the sensor detection unit of the pipe thickness measuring instrument, and the annular shape. This is a marking template 10 for marking (marking) two linear marks perpendicular to each other indicating the center position of the mark.

  That is, as shown in FIG. 1A1, the marking template 10 is formed at a right angle from a predetermined position 11a on one side 11 (upper long side) of a rectangular plate material having transparency and flexibility. A diameter r (hereinafter referred to as a small diameter r) corresponding to the size of the sensor portion of the measuring instrument, centered on a position 12a away from the rectangular plate material (one side 11) by a distance t1 / 2 that is ½ of the thickness t of the nib 40a. A circular arc 12 engraved in an open state on the one side 11. Further, the marking template 10 is a first indicating the direction of the center position 12a of the arc 12 engraved on a rectangular plate material below the arc 12 at a right angle to the side 11 from the center 12a. The line 13 is provided. The marking template 10 includes a first circular hole 14 having a small diameter r corresponding to the circular arc 12 opened in the rectangular plate member, and four radial directions (vertical and horizontal directions) of the first circular hole 14. And a second indicating line 15 indicating the center position 14a of the first circular hole 14, which is cut at a right angle to the first circular hole 14. Note that the center position 12a of the arc 12 is located outside the rectangular plate, and is present at a position away from the predetermined position 11a on one side 11 of the rectangular plate by the distance t1 / 2. The first indicator line 13 indicates the direction of the center position 12a of the arc 12 from below.

  In addition, the first indicating line 13 is engraved in a straight line and is subjected to a process of adding black ink. As a result, when the marking template 10 is handled, even if the finger of the measurer touches the first indicator line 13 from above, it does not disappear and can be used repeatedly. Note that the same processing is performed for the lines shown later.

  Further, the second indicating line 15 is engraved in the left and right direction with two indicating lines 15a and 15b engraved in the vertical direction around the center position 14a of the first circular hole 14, respectively. It consists of two indicating lines 15c and 15d. The first extension line 15e passing through the upper and lower two indicating lines 15a and 15b and the second extension line 15f passing through the two left and right indicating lines 15c and 15d are the center position 14a of the first circular hole 14. A cross is formed at the intersection. That is, the first extension line 15e and the second extension line 15f are orthogonal to each other. Thereby, the center position 14a of the first circular hole 14 can be accurately specified using the second indicating line 15.

  As shown in FIG. 1A1, the first indicating line 13 and the upper indicating line 15a that is a part of the second indicating line 15 have a common configuration, that is, a straight line extending in the vertical direction. This is configured as an indicating line 135. Thus, by configuring the first indicating line 13 and the upper indicating line 15a in common, the number of indicating lines engraved in the marking template 10 can be reduced, and the configuration can be simplified. .

  In addition, the rectangular plate member has a second circular hole 16 and a third circular hole 17 corresponding to the circle 21 having a small diameter r corresponding to the interval between a plurality of annular marks provided on the surface of the small pipe. At the interval y, the first circular holes 14 are opened in a line in the left direction. The central position 14a of the first circular hole 14, the central position 16a of the second circular hole 16, and the central position 17a of the third circular hole 17 are positioned on the second extension line 15f. It is configured. As a result, if the marking template 10 is brought into contact with the surface of the small pipe, a plurality of annular marks can be continuously applied at the intervals y using the plurality of circular holes 14, 16, and 17. Become. Specifically, the interval y corresponds to the interval between a plurality of annular marks provided on the surface of a small pipe having an inner diameter of 20 mm.

  Further, as shown in FIG. 1A2, the peripheral portion 14b of the first circular hole 14 has a predetermined angle α (for example, 45 degrees) with respect to the vertical line 14c. A tapered surface inclined in the direction is provided. As a result, if the pen tip 40a of the marking pen 40 is brought into contact with the tapered surface 14b, the tip of the pen tip 40a is just guided to the peripheral end of the first circular hole 14. It is possible to accurately match the diameter of the annular mark to be made with the small diameter r of the first circular hole 14. In addition, the peripheral part of the 2nd circular hole 16 and the peripheral part of the 3rd circular hole 17 are each provided with a taper surface similarly to the peripheral part of the 1st circular hole 14 mentioned above.

  Furthermore, the configuration of the marking template 10 according to the first embodiment will be described in detail.

  A third indicating line 18 and a fourth indicating line 19 are formed on one side 11 of the rectangular plate material, with the first extension line 15e as a symmetry axis and at a predetermined distance d from the symmetry axis 15e. They are engraved symmetrically. Here, the first intersection 12b and the second intersection 12c, which are the intersections of the one side 11 of the rectangular plate and the arc 12, respectively, exist symmetrically with respect to the symmetry axis 15e. The distance x between the third line 18 and the first intersection 12b corresponds to the value obtained by subtracting the small diameter r from the distance d, and the optimum length of the linear mark applied to the surface of the small pipe Designed to be The optimum length is the length of the linear mark known from experience, and a part of the second indicating line 15 ( 1), it means the length of a linear mark that makes it possible to make the center position of the thickness measurement region coincide with the center position 14a of the first circular hole 14. Accordingly, if the measurer places the pen tip 40a of the marking pen 40 along the one side 11 of the rectangular plate material between the first intersection 12b and the third indicating line 18, a linear shape with an optimal length is obtained. This mark can be easily applied. The interval x between the fourth indicating line 19 and the second intersecting point 12c is the same, and a linear shape having an optimal length is obtained using the second intersecting point 12c and the fourth indicating line 19. The mark can be easily applied.

  A fifth indicating line 20 indicating the center position 17a of the third circular hole 17 is engraved in the vertical and horizontal directions of the third circular hole 17. Similarly to the second indicator line 15, the fifth indicator line 20 includes two indicator lines 20 a and 20 b that are engraved in the vertical direction around the center position 17 a of the third circular hole 17. It consists of two indicating lines 20c and 20d each engraved in the direction. The two left and right indicating lines 20c and 20d pass on the second extension line 15f, and the third extension line 20e and the second extension line 15f passing through the upper and lower two indicating lines 20a and 20b are the third extension line 15f. A cross shape is formed with the center position 17a of the circular hole 17 as an intersection. Thereby, the center position 17a of the third circular hole 17 can be accurately specified using the fifth indicating line 20. The right indicating line 20d, which is a part of the fifth indicating line 20 engraved between the second circular hole 16 and the third circular hole 17, is The center position 16a is shown from the left direction, and the center position 17a of the third circular hole 17 is shown from the right direction, which leads to a reduction in the number of lines indicated.

  Further, a fourth circular hole 22 corresponding to a circle having a small radius r and a large radius R (hereinafter referred to as a large diameter R) is opened in the rectangular plate material in the right direction with respect to the first circular hole 14. ing. Here, the said large diameter R respond | corresponds to the diameter of the circle corresponding to the magnitude | size of the sensor detection part for measuring the thickness of large sized piping. Further, the center position 22a of the fourth circular hole 22 is configured to be positioned on the second extension line 15f, and a right indicating line 15d which is a part of the second indicating line 15 is The center position 22a of the fourth circular hole 22 is configured to be shown from the left direction. And the 6th indicating line 23 which shows the center position 22a of the 4th circular hole 22 is engraved in the up-down direction of the 4th circular hole 22, and the right direction. Similarly to the second indicating line 15, the sixth indicating line 23 has two indicating lines 23 a engraved in the upward and downward directions around the center position 22 a of the fourth circular hole 22, respectively. 23b, a display line 23c cut in the right direction, and a right display line 15d, which is a part of the second display line 15 cut in the left direction. This makes it possible to apply a large-diameter R-shaped mark suitable for large-sized piping using the fourth circular hole 22 and the sixth indicating line 23, and at various sites where piping enters. The measurer responds to the occasion and makes a circular mark using the first to third circular holes 14, 16 and 17 for the small pipe, and the fourth circle for the large pipe. An annular mark can be applied using the hole 22. In addition, as a part of the sixth display line 23, the display line 15d on the right side of a part of the second display line 15 is used, which leads to reduction of the display lines. Further, a tapered surface is provided on the peripheral edge of the fourth circular hole 22 in the same manner as the peripheral edge of the first circular hole 14 described above.

  The total length of the marking template 10 is 100 mm in the left-right direction of the plan view of FIG. 1A1, 30 mm in the up-down direction, the interval t1 / 2 is 2 mm, the interval d is 25 mm, and the small diameter r is 14 mm. The interval y is 20 mm, and the large diameter R is 17 mm. Moreover, it is 1 mm in the up-down direction of sectional drawing of FIG. 1A2. The marking template 10 is made of a soft polyvinyl chloride resin having transparency and flexibility.

<How to use the template for marking>
Next, a method for using the marking template 10 according to the first embodiment of the present invention will be described. FIG. 2 is a first diagram showing a usage state of the marking template 10 according to the first embodiment of the present invention. FIG. 3 is a second view showing a usage state of the marking template 10 according to the first embodiment of the present invention. The vertical direction shown in FIGS. 2 and 3 corresponds to the vertical direction of the marking template 10 according to the first embodiment, and the horizontal direction shown in FIGS. 2 and 3 is the marking according to the first embodiment. Corresponds to the left and right direction of the template.

  First, a method of using the marking template 10 in the case of carrying out a thickness measurement operation for a small pipe that is not given any linear marks will be described.

  As shown in FIG. 2B1, the measurer searches the surface of the small pipe 1 for the wall thickness measurement area 1a instructed in advance by an administrator or the like, and assumes the wall thickness measurement area 1a by the arc 12 of the marking template 10. The marking template 10 is placed on the surface so that the circle 21 having the small diameter r hits (step 11). Specifically, the measurer aligns the arc 12 with the thickness measurement region 1a, and sets the center position 1b of the thickness measurement region 1a to one of the center positions 12a of the arc 12 indicated by the first indicated line 13. The position of the marking template 10 is adjusted so as to match the direction.

  Next, the measurer applies the first linear mark 2a and the second linear mark 2b along the pen tip 40a of the marking pen 40 along one side 11 of the placed marking template 10. (Step 12, FIG. 2B1). Here, the first linear mark 2a is applied corresponding to the range from the first intersection 12b to the third indicating line 18 of the marking template 10, and the second intersecting point from the fourth indicating line 19 to the second intersecting point. When the second linear mark 2b is applied corresponding to the range up to 12c, the length of the first linear mark 2a and the length of the second linear mark 2b are respectively the optimum values described above. It becomes a long length and is preferable. The axial center line 2a1 of the applied first linear mark 2a and the axial center line 2b1 of the second linear mark 2b coincide with each other, and the first linear mark One direction of the center position 1b of the thickness measurement region 1a is accurately indicated by 2a and the second linear mark 2b.

  Then, as shown in FIG. 2B2, the measurer rotates the marking template 10 in the rotation direction of the watch by 90 degrees, and then the first indicating line 13 of the marking template 10 is applied first. It is made to correspond to one linear mark 2a, and one direction of the center position 12a of the arc 12 indicated by the first indicating line 13 is aligned with the center position 1b of the thickness measurement region 1a. Then, the measurer brings a circle 21 assumed by the arc 12 of the marking template 10 into contact with the thickness measurement region 1a (step 13). Here, since the marking template 10 has a plate shape (rectangular shape) and has a simple configuration, the marking template 10 can be bent and brought into contact with the surface of the small pipe 1. The same applies when the first indicating line 13 is made to coincide with the second linear mark 2b instead of the first linear mark 2a.

  Next, the measurer places the pen tip 40a of the marking pen 40 along the one side 11 of the marking template 10 and, similarly to the above, the third linear mark 2c and the fourth linear mark 2d. (Step 14, FIG. 2B2). In the same manner as described above, the third linear mark 2c is used using the third indicating line 16 and the first intersection 12b, and the fourth linear mark 2c is used using the fourth indicating line 17 and the second intersecting point 12c. The linear mark 2d is preferably applied.

  Here, the extension line 2cd1 passing through the axial center line of the applied third linear mark 2c and the axial center line of the fourth linear mark 2d is the center of the thickness measurement region 1a. Orthogonal to the extension line 2ab1 passing through the axial center line 2a1 of the first linear mark 2a and the axial center line 2b1 of the second linear mark 2b, with the position 1b as an intersection. Become. Therefore, the measurer can accurately specify the center position 1b of the thickness measurement region 1a by the first to fourth linear marks 2a to 2d.

  Subsequently, the measurer removes the marking template 10 from the surface of the small pipe 1 and uses a grinder or a solvent to remove the rust inhibitor, paint, rust, etc., which have been applied in advance to the thickness measurement region 1a ( Step 15).

  Then, as shown in FIG. 2B3, the measurer puts the second indicating line 15 of the marking template 10 on the first to fourth linear marks 2 a to 2 d provided on the surface of the small pipe 1. (Step 16, FIG. 2B3). As a result, the center position 14a of the first circular hole 14 of the marking template 10 accurately overlaps the center position 1b of the thickness measurement region 1a.

  Further, as shown in FIG. 2B4, in a state where the center position 14a of the first circular hole 14 and the center position 1b of the wall thickness measurement region 1a are matched, the measurer measures the size (small diameter r) of the sensor detection unit. The sensor detection unit pen 41 having an annular pen point 41a equivalent to the size of the circle 21 is taken out, and the pen point 41a of the sensor detection unit pen 41 is applied to the peripheral edge of the first circular hole 14. Then, an annular mark 2e is applied to the thickness measurement region 1a (step 17, FIG. 2B4). Thereby, the center position 2e1 of the annular mark 2e can be made coincident with the center position 1b of the thickness measurement region 1a, and the annular mark 2e can be easily applied to the surface of the small pipe 1. The marking pen 40 may be used instead of the sensor detection unit pen 41.

  Next, as shown in FIG. 3B5, the measurer removes the marking template 10 from the surface of the small pipe 1, applies a sonicoat (contact medium) to the annular mark 2 e, and the sensor of the wall thickness measuring device 3. The detector 3a is brought into precise contact with the annular mark 2e, and the thickness of the small pipe 1 is measured (step 18). By accurately contacting the sensor detection unit 3a with the annular mark 2e, the sensor detection unit 3a can be accurately brought into contact with the thickness measurement region 1a.

  Then, after the thickness measurement is completed, as shown in FIG. 3B6, the measurer uses the marking pen 40 to fill the inside of the annular mark 2e into a circular mark 2f (step 19). As a result, the circular mark 2f covers the surface of the thickness measurement region 1a, so that the circular mark 2f performs a rust prevention function, and the thickness measurement is performed next due to the presence of the circular mark 2f. In this case, it is possible to easily find the thickness measurement region 1a in which the previous thickness measurement was performed from the outside. After this, the measurer applies the rust inhibitor again to the area where the rust inhibitor on the surface of the small pipe 1 has been removed in the area other than the circular mark 2f, and the small size is obtained. Rust generated on the surface of the pipe 1 is prevented.

  In this way, the work of measuring the thickness of the first small pipe is completed.

  Next, a method of using the marking template 10 in the case of carrying out the work of measuring the thickness of a small pipe already provided with a linear mark and a circular mark will be described.

  When the time point at which the next measurement of the thickness of the small pipe 1 is performed after the predetermined period has elapsed, the measurer makes a circle on the small pipe 1 in order to newly measure the wall thickness in the thickness measurement region 1a. The shape mark 2f, the rust inhibitor and rust are removed with a grinder or a solvent (step 21). Even if the circular mark 2 f is removed, the four straight marks 2 a to 2 d remain on the surface of the small pipe 1.

  Next, as shown in FIG. 3C1, the measurer aligns the second indicating line 15 of the marking template 10 with the first to fourth linear marks 2a to 2d (step 22, FIG. 3C1). . As a result, the center position 14a of the first circular hole 14 can be accurately matched again with the center position 1b of the thickness measurement region 1a.

  Then, the measurer applies an annular mark 2e on the surface of the small pipe 1 using the sensor detection pen 41 as in Step 17 (Step 23). As a result, the applied annular mark 2e is accurately reproduced at the same position in the thickness measurement region 1a which has been previously measured for thickness.

  Thereafter, the measurer performs the wall thickness measurement in the same manner as in the step 18 and fills the inside of the annular mark 2e in the same manner as in the step 19 to complete the wall thickness measurement operation (step 24). .

  Thus, even if the operation | work which apply | coats and wipes off the annular mark 2e, Sonicoat, a rust preventive agent, etc. on the surface of the small piping 1 repeatedly is performed, the marking template which concerns on 1st embodiment of this invention If 10 is used, the wall thickness measurement region 1a on the surface of the small pipe 1 can be accurately specified at the same position, so that a highly accurate wall thickness measurement result can be obtained.

  In step 21, when the measurer removes the circular mark 2f, if all or part of the four linear marks 2a to 2d are removed, the above-described steps 11 to 14 are performed. And the removed straight mark may be reproduced on the surface of the small pipe 1.

  For example, as shown in FIG. 3C2, the measurer aligns one direction of the center position 12a of the arc 12 indicated by the first line 13 of the marking template 10 with the center position 1b of the thickness measurement region 1a. A circle 21 assumed by the arc 12 of the marking template 10 is brought into contact with the thickness measurement region 1a. Then, the measurer may reproduce the first linear mark 2a and the second linear mark 2b by placing the pen tip 40a of the marking pen 40 along one side 11 of the marking template 10. The same applies when reproducing the third linear mark 2c and the fourth linear mark 2d. If some of the four linear marks 2a to 2d remain on the surface of the small pipe 1, they are removed using the remaining linear marks and the marking template 10. The straight mark may be reproduced on the surface of the small pipe 1.

  As described above, the marking template 10 according to the first embodiment has a thickness of the nib 40a of the marking pen 40 at a right angle from the predetermined position 11a on one side 11 of the plate material having transparency and flexibility. Centered at a position 12a away from the plate material by a distance t1 / 2 that is ½ of t, and opened to the one side 11 along a circle with a small diameter r corresponding to the size of the sensor unit 3a of the measuring device 3 A first indication showing the direction of the center position 12a of the arc 12 engraved on the plate 12 below the arc 12 at a right angle to the side 11 from the center 12a. The first circular hole 14 having a small diameter r corresponding to the arc 12 and opened in the plate material, and the first circular hole 14 cut at right angles in the four radial directions of the first circular hole 14. A second indicating line 15 indicating the center position 14a of the circular hole 14 .

  With this configuration, when carrying out the wall thickness measurement operation of the small pipe 1, the arc 12 is aligned with the wall thickness measurement region 1a, and the center position 1b of the wall thickness measurement region 1a is indicated by the first line 13. If the direction of the center position 12a of the circular arc 12 is aligned, the pen tip 40a of the marking pen 40 is placed along one side 11 of the marking template 10, and the linear marks 2a to 2d are applied, the thickness measurement region 1a It becomes possible to easily apply linear marks 2a to 2d that accurately indicate one direction of the center position 1b. Further, the positional deviation between the axial center line of the linear marks 2a to 2d and the center position 1b of the thickness measurement region 1a, which is caused by the thickness of the pen tip 40a of the marking pen 40, is prevented. It becomes possible to do. And since the marking template 10 according to the first embodiment is plate-shaped and has a simple configuration, it is possible to bend the marking template 10 and bring it into contact with the surface of the small pipe 1. It is possible to accurately mark the straight marks 2a to 2d on the surface of the small pipe 1 that could not be achieved by the prior art.

  In addition, after the four linear marks 2a to 2d are applied so as to indicate the center position 1b of the thickness measurement region 1a, the second indicating line 15 is superimposed on the four linear marks 2a to 2d. For example, since the center position 1b of the thickness measurement region 1a and the center position 14a of the first circular hole 14 indicated by the second indicating line 15 coincide with each other, the diameter corresponding to the first circular hole 14 is small. When the r-shaped mark 2e is applied, the center position 2e1 of the ring-shaped mark 2e can be matched with the center position 1b of the thickness measurement region 1a. For this reason, the sensor detection unit 3a of the measuring instrument 3 can be accurately brought into contact with the thickness measurement region 1a using the annular mark 2e. Moreover, even if the annular mark 2e once applied is wiped off, if the annular mark 2e is applied again using the four linear marks 2a to 2d, the annular mark 2e will be Since the measurement is performed at the position of the same thickness measurement region 1a where the measurement is performed, a highly accurate thickness measurement result can be obtained. Furthermore, even if the measurer changes to another measurer, the four linear marks 2a to 2d can continue the aging monitoring without reducing the thickness measurement accuracy of the small pipe. And since the template 10 for marking which concerns on 1st embodiment is simple structure, it does not cost.

<Second Embodiment>
4D1 is a plan view showing a marking template 50 according to the second embodiment of the present invention, and FIG. 4D2 is a cross-sectional view taken along line BB shown in FIG. 4D1. 4D1 and 4D2 correspond to the vertical direction of the marking template 50 according to the second embodiment of the present invention, and the horizontal direction illustrated in FIGS. 4D1 and 4D2 corresponds to the second direction of the present invention. This corresponds to the left-right direction of the marking template 50 according to the embodiment. Moreover, in FIG. 4D1 and FIG. 4D2, the same code | symbol shown by 1st embodiment about the structure similar to 1st embodiment is attached | subjected.

  Compared with the first embodiment, the second embodiment is different from the first embodiment in that a second arc 52 drawn assuming a circle 51 having a large diameter R, and the center of the second arc 52. This is a point provided with a seventh indicating line 53 indicating the direction of the position 52a.

  That is, as shown in FIG. 4D1, the marking template 50 according to the second embodiment has the above-mentioned distance t1 perpendicular to a predetermined position 54a of the second lower side 54 (lower long side) of the rectangular shape. A second circular arc engraved in a state of being opened on the second side 54 along a circle 51 having a large diameter R, centered on a position 52a away from the rectangular plate (second side 54) by / 2. 52 and the direction of the center position 52a of the second arc 52 engraved on the rectangular plate above the second arc 52 at a right angle to the second side 54 from the center 52a. And a seventh indicating line 53. Accordingly, it is possible to apply a linear mark indicating the center position of the thickness measurement region of the large pipe using the second arc 52 and the seventh indicating line 53. For this reason, it is possible to perform the wall thickness measurement operation using both the small pipe and the large pipe by using the marking template 50 according to the second embodiment.

  In addition, in the marking template 50 according to the second embodiment, as shown in FIG. 4D1, instead of separating the first indicating line 13 and the second indicating line 15, the first indicating line 13 and the first indicating line 13 The seventh display line 53 is configured as a common structure, that is, a straight display line 1353 extending in the vertical direction. As a result, the second arc 52 and the seventh indicating line 53 can be added to the marking template 50, and the number of indicating lines provided in the marking template 50 can be reduced to simplify the configuration. It becomes possible to do.

  Similarly to the arc 12 (first arc) according to the first embodiment, the second arc 52 has a fourth extension line 53a as an axis of symmetry and a predetermined distance e from the axis of symmetry 53a. At a distance, an eighth indicating line 55 and a ninth indicating line 56 are provided symmetrically in the vicinity of the second side 54 of the rectangular plate. Here, a third intersection point 52b and a fourth intersection point 52c, which are the intersection points of the second one side 54 of the rectangular plate material and the second arc 52, respectively exist symmetrically with respect to the symmetry axis 53a. However, the interval z between the eighth indicating line 55 and the third intersection 52b corresponds to the value obtained by subtracting the large diameter R from the interval e, and the linear mark applied to the surface of the large pipe Designed for optimal length. The same applies to the distance z between the ninth indicating line 56 and the fourth intersection 52c. As a result, the measurer can easily apply a linear mark having an optimal length even to a large pipe.

  Further, the interval u between the first circular hole 14, the second circular hole 16, and the third circular hole 17 corresponding to the circle 21 with the small diameter r is the marking template 10 according to the first embodiment. The first circular hole 14, the second circular hole 16, and the third circular hole 17 are configured to be larger than the interval y between them. Specifically, the interval u corresponds to the interval between a plurality of annular marks provided on the surface of a small pipe having an inner diameter of 25 mm. As described above, the intervals between the first circular hole 14, the second circular hole 16, and the third circular hole 17 may be appropriately changed as necessary.

  Further, instead of providing the seventh indicating line 53 described above, two upper and lower indicating lines 15a and 15b, which are part of the second indicating line 15, are connected to the center position 21a of the second circular hole 21. The second indicating line 15 indicating the center position 14 a of the first circular hole 14 is configured to indicate the center position 21 a of the second circular hole 21 by being provided vertically. As described above, if the second indicating line 15 is configured to indicate the center position of any one of the first to third circular holes 14, 16, and 17, the second indicating line 15 is appropriately set as necessary. The design may be changed.

  Further, the right indicating line 20d which is a part of the fifth indicating line 20 provided in the marking template 10 according to the first embodiment is the same as that in the marking template 50 according to the second embodiment. It is configured to be provided to the right of the center position 14a of one circular hole 14. As described above, the design of the indicated line may be changed as appropriate according to the configuration of the marking template.

  In addition, the first to fourth circular holes 14, 16, 17, 22 are each provided with a tapered surface in the same manner as the marking template 10 according to the first embodiment. In FIG. 4D2, the taper surface with which the peripheral part 16b of the 2nd circular hole 16 was equipped is shown.

  Note that the total length of the marking template 50 is 100 mm in the left-right direction of the plan view of FIG. 4D1, 30 mm in the up-down direction, the interval t1 / 2 is 2 mm, the interval e is 27 mm, and the interval u is 25 mm. The large diameter R is 17 mm. Moreover, it is 1 mm in the up-down direction of sectional drawing of FIG. 4D2.

  Even if it is the template 50 for marking which concerns on 2nd embodiment mentioned above, it has the same effect as the template 10 for marking which concerns on 1st embodiment. Moreover, since the usage method of the marking template 50 which concerns on 2nd embodiment is the same as that of the marking template 10 which concerns on 1st embodiment, the description is omitted.

  In the marking templates according to the first and second embodiments, three circular holes corresponding to the circle 21 having the small diameter r are provided. However, two or more may be provided. .

  In the marking templates according to the first and second embodiments, soft polyvinyl chloride resin is used as a material. However, any resin having transparency and flexibility can be used. May be adopted. As the resin, for example, various thermoplastic resins such as polyolefin resin, polystyrene resin, polyester resin, polyacrylic resin, and polycarbonate resin may be adopted.

  Further, in the marking templates according to the first and second embodiments, although they are formed in a rectangular shape, a triangular shape, a quadrangular shape, a hexagonal shape, an octagonal shape, a polygonal shape can be used as long as it is a plate shape whose one side is a straight line. Any shape such as a shape may be used.

  In the marking templates according to the first and second embodiments, the entire surface is uniformly and smooth with a predetermined thickness, but the marking template can contact the surface of the small pipe 1 without deviation. Thus, it may be formed with a predetermined deflection. Since the bending allows a part of the marking template to come into contact with the surface of the small pipe 1 without leaving the pipe, an annular mark or a straight mark can be accurately placed on the wall thickness measurement region. It becomes possible to attach.

  In the marking templates according to the first and second embodiments, a magnet that can adhere to the surface of the small pipe 1 may be further provided. With this configuration, if the magnet of the marking template is attached to the surface of the small pipe, it is possible to proceed with the marking operation using both hands without shifting the thickness measurement region. Therefore, it is possible to reduce a measurement error caused by a deviation of the thickness measurement region without causing a mark mistake.

  As described above, the marking template according to the present invention is useful when periodically performing a wall thickness measurement operation of a small pipe, and can be easily performed with an inexpensive material without reducing the accuracy of the wall thickness measurement result. It is also effective as a template for marking for quickly measuring the thickness of small pipes.

DESCRIPTION OF SYMBOLS 10 Marking template which concerns on 1st embodiment 11 One side 12 Arc 13 First indicating line 14 1st circular hole 15 2nd indicating line 50 Marking template which concerns on 2nd embodiment

Claims (3)

A sensor part of a measuring instrument, centered at a position that is perpendicular to a predetermined position on one side of a plate material having transparency and flexibility and is separated from the plate material by a distance that is half the pen tip thickness of the marking pen. An arc engraved in an open state on the one side along a circle with a diameter corresponding to the size of
A first line indicating the direction of the center position of the arc, engraved on the lower plate of the arc perpendicular to the one side from the center;
A circular hole having a diameter corresponding to the arc, opened in the plate,
A second line indicating the center position of the circular hole engraved at right angles to the four radial directions of the circular hole;
Marking template with   The marking template according to claim 1, wherein at least two or more circular holes are opened in the plate material at intervals corresponding to intervals between a plurality of annular marks provided on a surface of the pipe.   The marking template according to claim 1 or 2, wherein a tapered surface that is inclined inwardly of the circular hole at a predetermined angle is provided at a peripheral portion of the circular hole.

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