JP2009109388A - Template - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a marking template for use in marking the wall-thickness measuring position of a sensor detection unit for measuring wall thickness. <P>SOLUTION: The marking template 10 is provided having slots 12 cut in at least two portions, and a circular hole 11 opened in a size matching the size of a sensor detection unit for measuring the subject of measurement. With this configuration, the circular hole 11 is applied to the center of a predetermined wall-thickness measuring position and a linear mark 3 is made on a piping surface 1 via the slots 12, thereby it is possible to uniquely specify the predetermined wall-thickness measuring position while an intersection point that intersects an extension line of the mark 3 is used as a center. Thus, even if the operation of applying and then wiping off a circular mark 5 or an ultrasonic contact medium or the like to the predetermined wall-thickness measuring position is performed many times, it is possible to obtain accurate wall thickness measurements, without displacement from the previous wall-thickness measuring position. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a template, and more particularly, to a marking template used for marking a thickness measurement position of a thickness detection sensor detector.

  For example, piping that handles high-temperature and high-pressure water or steam installed in nuclear power plants, etc., has been used for many years, erosion (also called erosion) due to physical or mechanical action such as collision of fluid inside the piping. ) Or electrochemical action (also referred to as corrosion) occurs, and the thickness of the pipe decreases with time.

  If the pipe thickness is reduced, the internal fluid load is likely to be applied to the reduced thickness and the pipe itself is likely to be damaged.Consequently, the pipe thickness measurement, i.e. It is also an important task for prediction.

  As methods for measuring the thickness of the pipe, a destructive inspection method for measuring the thickness of a pipe cut with a caliper or a gauge and a nondestructive inspection method for measuring using ultrasonic waves are known. Although the above destructive inspection method can accurately measure the wall thickness because the pipe is cut, it is not practical when monitoring over time, and the non-destructive inspection method is mainly used as the method for measuring wall thickness over time. Yes.

  Although this non-destructive inspection method can easily measure the pipe thickness without destroying the pipe, the measurement error of the wall thickness is caused by the deviation of the thickness measurement position where the ultrasonic probe that is the sensor detection unit is in contact. There is a problem that it is easy to occur and accurate thickness measurement is difficult.

  Therefore, for example, Japanese Patent Laid-Open No. 6-258063 (Patent Document 1) has a plurality of engaging portions that are provided at positions corresponding to the thickness measuring positions of the object to be measured and that engage with the transducer. There is disclosed a measuring jig for a transducer comprising a magnet sheet that is attracted to an object. According to the above configuration, since the transducer can be measured after being directed in the correct direction at the correct position, the measurement accuracy by the transducer can be improved and the measurement time can be shortened.

  Furthermore, in Japanese Patent Laid-Open No. 10-269033 (Patent Document 2), a slider on which an ultrasonic probe is mounted is arranged on an annular rail, and the thickness of the pipe is measured using an ultrasonic echo. Piping diagnosis that measures the thickness of the defective part by re-adjusting the attitude of the ultrasonic probe from the ultrasonic probe's attitude and the feature quantity of the ultrasonic echo for the part judged to be in poor contact state An apparatus is disclosed. With the above configuration, by correcting the attitude of the ultrasonic probe, it is possible to measure points that could not be measured accurately and to improve measurement accuracy.

Japanese Patent Laid-Open No. 2000-346632 (Patent Document 3) discloses a probe jig for rotatably holding an ultrasonic probe, a roller mechanism having a roller made of a permanent magnet, and a pulling traction. An apparatus for measuring a wall thickness of a pipe provided with a wire is disclosed. With the above configuration, the thickness of a small-diameter pipe installed in a narrow environment can be measured efficiently and accurately without destruction.
JP 2001-326951 A Japanese Patent Laid-Open No. 10-269033 Japanese Unexamined Patent Publication No. 2000-346632

  However, since the technique described in Patent Document 1 has a plurality of engaging portions, the magnet sheet becomes long and is troublesome to wrap around the pipe, and the thickness measurement position cannot be easily specified. There was a problem.

  Further, although the techniques described in Patent Document 2 and Patent Document 3 have high measurement accuracy, a slider or a probe jig on which an ultrasonic probe is mounted is required separately from the ultrasonic probe. There was a problem that the cost was very high.

  Furthermore, when measuring the wall thickness of pipes using an ultrasonic probe, it is said to be Sonicoat in order to improve the signal-to-noise ratio of the ultrasonic probe and minimize the measurement error of the wall thickness. The ultrasonic contact medium that also functions as a rust preventive agent is applied to the thickness measurement position. However, in the techniques described in the above-described patent techniques 1 to 3, the ultrasonic contact medium is applied and then the thickness measurement is performed. The implementation is a laborious operation, and there is a problem that the thickness measurement operation cannot be easily performed.

  Accordingly, the present invention has been made to solve the above-described problems, and provides a marking template used for marking the measurement position of the thickness-measurement sensor detection unit.

  In order to solve the above-described problems and achieve the object, the marking template according to the present invention has a long groove cut into at least two places in the plate and the size of the sensor detection unit that measures the object to be measured. And a circular hole opened to a size corresponding to.

  Moreover, it shape | molds with a flexible member or a transparent member.

  In addition, the long groove is cut at three or four points, with two straight lines orthogonal to each other with the center of the circular hole as an intersection.

  Further, the marking template is provided with a magnet that can adhere to the object to be measured.

  According to the marking template of the present invention, a long groove cut into at least two locations in the plate, and a circular hole opened to a size corresponding to the size of the sensor detection unit for measuring the object to be measured. It is configured to provide.

  As a result, when performing pipe wall thickness measurement work, if a circular hole is applied to the center of a predetermined wall thickness measurement position and a mark corresponding to the long groove is provided on the pipe surface, the marking template can be placed on the pipe surface. Even if it is detached, it can be left still at the position once marked. In other words, the circular hole is accurately applied to the predetermined thickness measurement position without any deviation. For this reason, no matter how many times a round mark corresponding to the circular hole, ultrasonic contact medium, rust inhibitor, etc. is applied or wiped off, the wall thickness measurement position is identified as the same position, and the pipe wall thickness is determined. Even in the thickness measurement operation, it is possible to obtain a highly accurate thickness measurement result. 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. Furthermore, since the marking template has a simple structure, there is no cost.

  Moreover, it shape | molds with a flexible member or a transparent member.

  Thus, when the marking template is applied to the pipe surface, the template can be bent by the flexibility of the marking template to match the curved surface of the pipe surface, and the marking operation can be performed. Moreover, when marking, it becomes possible to visually recognize the pipe surface through the marking template due to the transparency of the marking template, and the marking operation can proceed smoothly without deviation.

  Moreover, the said long groove is comprised so that it may be cut in three or four places centering on the two straight lines orthogonal to the center of the said circular hole as an intersection.

  As a result, the minimum number of long grooves for accurately specifying the center of the circular hole is sufficient. For this reason, the shape of the template plate for providing the long groove becomes the minimum necessary shape, and the work for marking the pipes can be reduced. As a result, it is possible to easily and quickly advance the wall thickness measurement operation without reducing the pipe wall thickness measurement accuracy. Further, since the template plate may be the minimum necessary shape, it can be easily carried without being unnecessarily large.

  Furthermore, the marking template is configured to be provided with a magnet that can adhere to the object to be measured.

  Thereby, when performing the operation | work which applies a mark, if the template for marking is made to adhere on the piping surface, it will become possible to advance the said operation | work using both hands, without shifting a thickness measurement position. Therefore, it is freed from the conventional work, that is, the inconvenient work of placing the marking template on the pipe surface with one hand and marking with the other hand, resulting in a mark mistake. In addition, there is no measurement error caused by the displacement of the wall thickness measurement position.

  The above-described marking template is particularly effective when used for pipe thickness measurement work in which marking is performed many times on the same position, since the same position can be specified with high accuracy.

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. 1 is a plan view showing a first embodiment of the present invention.

  The marking template 10 is provided with a circular hole 11 corresponding to the size of the sensor detection unit in the center of a flexible transparent plate provided with a cross-shaped wing. A long groove 12 having two straight lines perpendicular to the center of the circular hole as an intersection is provided. Furthermore, magnets 13 that can be attached to the pipe surface are provided at two positions facing the center of the circular hole 11.

  Next, a method of using the marking template 10 will be described. 2 and 3 show a state in which the marking template according to the first embodiment is used.

  As shown in FIG. 2A, the marking template 10 is first placed on the pipe surface 1 so that the circular hole 11 hits the position where the thickness of the pipe should be measured, and the marking pen 2 is placed in the long groove 12 of the marking template 10. Along the line, four linear marks 3 are drawn on the pipe surface 1. Subsequently, after removing the marking template 10, the rust inhibitor, paint, and rust previously applied to the position to be measured for thickness are removed by a grinder or a solvent, and the linear mark 3 and the long groove 12 are again formed. The marking template 10 is allowed to stand on the pipe surface 1. As a result, the circular hole 11 accurately overlaps the position where the wall thickness is to be measured without the marking template 10 being displaced to the position where the linear mark 3 is first attached.

  In addition, since the magnet 13 provided in the marking template 10 is fixed on the pipe surface 1, even if the linear mark 3 and the long groove 12 are slightly deviated, they are easily corrected and the circular hole 11 is corrected. Can be accurately adjusted to the position where the thickness is to be measured.

  When the circular hole 11 and the position where the thickness is to be measured are combined, the sensor detection unit pen 4 having the same size as the edge of the sensor detection unit is applied to the edge of the circular hole 11, and the circular mark 5 is piped. Mark on surface 1. Even if the marking template 10 is removed from the pipe surface 1, the circular mark 5 makes it possible to recognize the position where the thickness of the pipe should be measured at a glance. Further, when the sensor detection unit 6 is applied to the circular mark 5, if the sensor detection unit 6 is displaced from the circular mark 5, the circular mark 5 protrudes from the sensor detection unit 6, and Since the shift can be recognized immediately, the position of the sensor detection unit 6 can be easily corrected.

  Now, as shown in FIG. 2B, the marking template 10 is removed, and the sensor mark 6 is brought into contact with the circular mark 5 after the sonicoat is applied to measure the thickness of the pipe. After the wall thickness measurement, as shown in FIG. 3C, the marking mark 10 is again placed on the pipe by aligning the linear mark 3 and the long groove 12, and the circular mark 5 is filled with the marking pen 2. The portion where the thickness was measured last time is made visible from the appearance (FIG. 3D). In places other than the circular mark 5 and where the rust inhibitor on the pipe surface 1 has been removed, the rust inhibitor is applied again to prevent rust on the pipe.

  In the case where the thickness measurement is performed again after the predetermined period has elapsed, the thickness of the marking template 10 after removing the filled circular mark 7 and the applied rust inhibitor and rust with a grinder or solvent is measured. Using the long groove 12 and the linear mark 3, the circular mark 5 is applied again at the same position where the thickness was measured last time, and the thickness measurement is performed.

As described above, even if the work of applying or wiping the circular mark 5, the ultrasonic contact medium, the rust inhibitor, etc. is performed many times, the thickness measurement position is the same position when the marking template 10 is used. It is possible to obtain a highly accurate wall thickness measurement result even in a pipe wall thickness measurement operation including the above operation.
(Second embodiment)
FIG. 4 is a plan view showing a second embodiment of the present invention. FIG. 5 shows a state in which the marking template of the second embodiment is used.

  Compared to the first embodiment, the second embodiment is different from the first embodiment in that the cross shape is changed to a T-shape. Although the number of the long grooves 12 is reduced to three by changing to the above T-shape, for example, when measuring the thickness around the edge 8 of the pipe, as shown in FIG. The marking template 20 can be placed on the pipe surface 1 without the 20 blades protruding from the edge 7 of the pipe. Therefore, accurate marking and wall thickness measurement can be performed without the protruding wings of the marking template being in the way.

  In the marking templates in the first and second embodiments, the circular hole 11 is provided so as to match the size of the sensor detection unit 6, but the size corresponds to the size of the sensor detection unit to be used. You may provide the circular hole 11 in. For example, the size of the circle may be adjusted or the shape itself may be changed to a square or the like depending on the type of the sensor detection unit 6.

  Moreover, in the marking template in the first and second embodiments, it is configured to have a cross shape or a T shape corresponding to the position where the long groove 12 is provided. Any shape may be used as long as it is suitable for use in the work, and it may be configured to have various shapes such as a circle, an ellipse, a square, and a rectangle according to the convenience of the wall thickness measurement work.

  In the marking templates in the first and second embodiments, the three or four long grooves 12 are provided. However, if at least two or more are provided, the marking template is statically placed at the position where the marking template was previously placed. It is possible to place it. For example, it is preferable that the extended lines of the two long grooves are provided at positions orthogonal to each other, because the marking plate can be placed still more accurately at the position where the marking plate was previously placed. Further, the number of the long grooves 12 may be further increased. When the long groove 12 is increased, the work of making the linear mark 3 on the pipe through the long groove 12 is increased, but the circular hole 11 can be placed at the thickness measurement position with high accuracy.

  In the marking templates in the first and second embodiments, the long groove 12 is cut so as to have a predetermined linear shape. However, the predetermined linear shape allows the marking template to stand uniquely on the pipe surface 1. Any shape can be used, and the length, width, and the like may be changed according to the convenience of pipe thickness measurement work, for example, the ease of application of the marking pen 2.

  In the marking templates in the first and second embodiments, the entire surface is uniform and smooth with a predetermined thickness, but the marking template is bent so as to be left on the pipe surface 1 without deviation. May be formed. The bending allows a part of the marking template to be left on the pipe surface 1 without leaving the pipe, so that the circular mark 6 or the linear mark 3 is positioned at the position where the thickness is to be measured. Can be accurately attached.

  In the marking templates in the first and second embodiments, the two magnets 13 are provided. However, the number of magnets 13 is further increased to more firmly fix the marking template to the pipe surface 1. You may comprise so that it may be made. For example, if the magnets 13 are provided in the end portions of the blades provided with the long grooves 12 by the number of the long grooves 12, the linear grooves 3 can be attached without the long grooves 12 being displaced from the piping. Thickness measurement position can be specified well.

  As described above, the marking template according to the present invention is useful when periodically performing a pipe wall thickness measurement operation, easily and inexpensively without reducing the accuracy of the wall thickness measurement result. It is effective as a marking template for quickly measuring the thickness of pipes.

It is a top view which shows the template for marking of 1st embodiment. It is a 1st figure which shows the use condition of the template for marking of 1st embodiment. It is a 2nd figure which shows the use condition of the template for marking of 1st embodiment. It is a top view which shows the template for marking of 2nd embodiment. It is a figure which shows the use condition of the template for marking of 2nd embodiment.

Explanation of symbols

10 Marking template 11 having a cross-shape 11 Circular hole 12 Long groove 13 Magnet 1 Piping surface 2 Marking pen 3 Linear mark 4 Detection unit pen 5 Circular mark 6 Sensor detection unit 7 Filled circular shape Mark 8 Pipe edge 20 Marking template having a T-shape

Claims (4)

A long groove cut into at least two places in the plate,
A circular hole opened to a size corresponding to the size of the sensor detection unit for measuring the object to be measured;
Marking template with   The marking template according to claim 1, wherein the marking template is formed of a flexible member or a transparent member. The long groove was cut at three or four points with two straight lines orthogonal to the center of the circular hole as an intersection.
The marking template according to claim 1 or 2. Furthermore, the marking template is provided with a magnet that can adhere to the object to be measured.
The marking template according to any one of claims 1 to 3.

Images