JP2016114455A - Measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measuring apparatus capable of consecutively and quantitatively measuring the degree of creep damage of piping.SOLUTION: A measuring apparatus comprises an electromagnetic ultrasonic sensor T1 which measures the wall thickness of piping P, a mobile body K to which the electromagnetic ultrasonic sensor T1 is attached so that the measurement surface of the electromagnetic ultrasonic sensor T1 faces the outer peripheral surface of the piping P, and which moves along the longitudinal direction of the piping P; and guide members T102-T105 which are interposed between the electromagnetic ultrasonic sensor T1 and the piping P to guide the mobile body K so that the distance between the electromagnetic ultrasonic sensor T1 and the piping P is held at a constant distance when the mobile body K moves along the longitudinal direction of the piping P.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a measuring apparatus.

  In the boiler of a thermal power plant, many thin pipes (for example, diameter 50 mm) which circulate steam, such as a superheater and a heat exchanger tube of a reheater, pass. These pipes are subjected to high-temperature and high-pressure (for example, 580 ° C., 3 MPa) steam and the like, and are placed in a high-temperature environment, so that creep damage and oxidation thinning may occur. If these pipes break due to creep damage or reduced strength due to oxidation thinning, they will lead to major accidents. Therefore, periodic remaining life inspections are conducted, and replacement and repair are performed according to the remaining life.

  However, the inside and outside of these pipes are attached with oxide films formed by steam and deposits resulting from combustion gas generated by burning fuel in the boiler. When the temperature rises, creep damage and oxidation thinning may progress. Such creep damage and oxidation thinning are difficult to predict the damage location, so at present, one of the indicators that the worker uses the visual or ring-shaped jig to indicate the degree of creep damage. The work of confirming the degree of bulging of the pipe over a plurality of locations in the longitudinal direction is performed. However, there is a limit to judging the degree of bulging of the pipe using visual inspection or a jig, and considering that creep damage proceeds rapidly after exceeding a certain amount, quantitative determination without error Is needed. In addition, since these pipes are densely arranged innumerably, it is difficult to use a large measuring device.

  Against this background, various studies have been made on methods for continuously measuring creep damage of pipes used in boilers. For example, Patent Document 1 discloses the use of ultrasonic terminals to An apparatus for continuously measuring wall thickness is described.

JP 2007-187593 A

  However, in Patent Document 1 and the like, since it is assumed that the thickness of the pipe is measured using a contact-type ultrasonic sensor, the measurement is performed after removing the oxide film and deposits attached to the surface of the pipe by washing. It is necessary to carry out, and it cannot be said that it is a measuring apparatus suitable for continuous measurement over a plurality of locations in the longitudinal direction.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a measuring apparatus that can continuously and quantitatively measure the degree of creep damage of piping.

  The main present invention for solving the above-mentioned problems is an electromagnetic ultrasonic sensor for measuring the thickness of a pipe, and the electromagnetic ultrasonic sensor is attached so that the measurement surface of the electromagnetic ultrasonic sensor faces the outer peripheral surface of the pipe. And when the moving body moves along the longitudinal direction of the pipe, the distance between the electromagnetic ultrasonic sensor and the pipe is a constant distance. And a first guide member that is interposed between the electromagnetic ultrasonic sensor and the pipe and guides the moving body. Other features of the present invention will become apparent from the accompanying drawings and the description of this specification.

  According to the measuring apparatus according to the present invention, it is possible to continuously and quantitatively measure the degree of creep damage and oxidative thinning of piping. In particular, the measuring device according to the present invention is such that the measurement surface of the electromagnetic ultrasonic sensor is maintained at a certain distance from the surface of the measurement position of the pipe at each point in the longitudinal direction of the pipe, and the measurement position of the pipe Therefore, the thickness of the pipe can be continuously measured with high accuracy without performing pretreatment such as cleaning and polishing on the pipe.

It is a figure which shows the structure of piping of the measuring object in 1st Embodiment of this invention. It is a perspective view which shows the structure of the measuring apparatus in 1st Embodiment of this invention. It is a side view which shows the structure of the measuring apparatus in 1st Embodiment of this invention. It is a side view which shows the structure of the measuring apparatus in 1st Embodiment of this invention. It is a top view which shows the structure of the measuring apparatus in 1st Embodiment of this invention. It is a top view which shows the structure of the measuring apparatus in 1st Embodiment of this invention. It is a top view which shows the structure of the measuring apparatus in 1st Embodiment of this invention. It is a figure which shows the structure of the thickness measurement part in 1st Embodiment of this invention. It is a figure which shows the structure of the thickness measurement part in 1st Embodiment of this invention. It is a figure which shows the structure of the 1st outer diameter measurement part in 1st Embodiment of this invention. It is a figure which shows the structure of the 2nd outer diameter measurement part in 1st Embodiment of this invention. It is a top view which shows the structure of the measuring apparatus in 1st Embodiment of this invention.

  At least the following matters will become apparent from the description of this specification and the accompanying drawings.

<First Embodiment>
In the present embodiment, a mode in which the thickness and outer diameter of a pipe (hereinafter simply referred to as “pipe”) used in a boiler is continuously measured in the longitudinal direction using a measuring apparatus will be described.

  In FIG. 1, an example of piping which is a measuring object which concerns on this embodiment is shown. The piping used for the boiler is composed of a large number of thin pipes (for example, 50 mm in diameter) extending substantially in parallel, and the intervals between the pipes are approximately the same as the pipe diameter, and the pipes are in a dense state. . The pipe P to be measured is one of the pipes used in the dense boiler shown in FIG. 1, and is made of, for example, a material such as low alloy steel. The cross-sectional diameter in a direction substantially perpendicular to the direction is widened (hereinafter referred to as “bulging”). Therefore, creep damage and oxidation thinning can be detected by measuring the thickness and outer diameter of these pipes.

  The measuring apparatus according to the present embodiment transmits and receives ultrasonic waves in a non-contact manner to continuously measure changes in the thickness of the pipe without performing pretreatment such as cleaning and polishing on the pipe P. An electromagnetic ultrasonic sensor (Electro Magnetic Acoustic Transducer: EMAT) capable of performing measurement is used, and a cart mechanism suitable for continuous measurement using the sensor is provided. Furthermore, the measuring apparatus according to the present embodiment includes an outer diameter measuring unit configured by a laser dimension measuring apparatus or the like so that the outer diameter of the pipe P can be continuously measured in addition to the thickness of the pipe P. Is.

  Depending on the material of the pipe or how the stress is applied to the pipe, the creep damage may be detected only by the thickness reduction amount or the outer diameter bulge amount. Therefore, the measurement apparatus according to the present embodiment has a configuration in which both the thickness and the outer diameter can be continuously measured over each point in the longitudinal direction of the pipe P, and based on the measurement result, creep damage and oxidation thinning Can be detected.

=== Configuration of measuring device ===
Hereinafter, an example of the configuration of the measuring apparatus according to the present embodiment will be described with reference to FIGS. 2 is a perspective view of the measuring device, FIGS. 3A to 3B are side views of the measuring device, and FIGS. 4A to 4C are plan views of the measuring device. 4A, FIG. 4B, and FIG. 4C are plan views of the measuring device when cut along AA ′, BB ′, and CC ′ in FIG. 3A, respectively. Moreover, in FIG. 2, the piping P is abbreviate | omitted and the perspective view of the measuring apparatus is represented.

  2, 3 </ b> A to 3 </ b> B, and 4 </ b> A to 4 </ b> C, the Z axis is an axis along the longitudinal direction of the pipe P to be measured. Further, the X axis and the Y axis are axes indicating directions perpendicular to the longitudinal direction of the pipe P to be measured (the X axis and the Y axis are also in a relationship indicating a direction perpendicular to each other). In the following description, they are simply expressed as “X direction”, “Y direction”, and “Z direction”, respectively, the direction indicated by the arrow indicates the + direction, and the direction opposite to the arrow indicates the − direction. Further, the measuring apparatus is assumed to advance in the + Z direction along the pipe P, and the + Z direction is referred to as “front side” and the −Z direction is referred to as “rear side”.

  In the measuring apparatus according to the present embodiment, the thickness measuring unit T1, the first outer diameter measuring units T2, T3, the second outer diameter measuring units T4, T5, and the mirrors M1, M2 move along the longitudinal direction of the pipe P. It is configured to be attached to the moving body K. Then, the measuring device measures the thickness of the pipe P by the thickness measuring unit T1 while the moving body K moves along the longitudinal direction of the pipe P, and the first outer diameter measuring units T2, T3, second outer The outer diameter (swelling) of the pipe P is measured by the diameter measuring units T4 and T5.

  The thickness measuring unit T1 is an electromagnetic ultrasonic sensor that measures the thickness of the pipe P by outputting electromagnetic ultrasonic waves to the pipe P and detecting the electromagnetic ultrasonic waves reflected from the inside of the pipe P.

  The first outer diameter measuring portions T2 and T3 are arranged so as to emit laser parallel beams having a certain width with respect to the measurement position of the pipe P from the emitting portions T2A and T3A, respectively, and face each other across the pipe P. This is a laser dimension measuring device that measures the outer diameter of the pipe P in accordance with the laser parallel rays received by the received light receiving portions T2B and T3B. The first outer diameter measuring portions T2 and T3 are provided with the emitting portions T2A and T3A and the light receiving portions T2B and T3B so as to face each other across the pipe P in the X direction, and the light receiving portions T2B and T3B are the emitting portions T2A and T3A. By receiving the laser parallel rays L2 and L3 emitted from the laser beam, the width in the Y direction of the pipe P is measured, and the measurement result of the first outer diameter measurement unit T2 and the measurement result of the first outer diameter measurement unit T3 are measured. Based on this, the outer diameter of the pipe P in the Y direction, that is, the bulging amount is measured. Note that arrows L2 and L3 in the figure represent laser parallel rays emitted from the emission portions T2A and T3A.

  The second outer diameter measuring portions T4 and T5 emit linear laser beams with respect to the measurement position of the pipe P from the emitting portions T4A and T5A, respectively, and are arranged at substantially the same positions as the emitting portions T4A and T5A. This is a laser distance measuring device that measures the distance to the pipe P at the opposite position based on the reflected laser from the surface of the pipe P received by the light receiving portions T4B and T5B. The second outer diameter measuring unit T4 and the second outer diameter measuring unit T5 are arranged so as to face each other with the pipe P sandwiched in the X direction, and the second outer diameter measuring unit T4 and the second measurement result Based on the measurement result of the outer diameter measuring portion T5, the outer diameter of the pipe P in the X direction, that is, the bulging amount is measured. In the drawing, the emitting portions T4A and T5A and the light receiving portions T4B and T5B are installed in the respective housings of the laser distance measuring devices T4 and T5, and the emitting portion and the light receiving portion are not distinguished from each other. . Arrows L4 and L5 in the figure represent laser beams emitted from the emission portions T4A and T5A.

  The mirrors M1 and M2 reflect the lasers L2, L3, L4, and L5 emitted from the emission portions T2A, T3A, T4A, and T5A of the first outer diameter measurement units T2 and T3 and the second outer diameter measurement units T4 and T5. Thus, the lasers L2, L3, L4, and L5 are made to reach the respective light receiving portions T2B, T3B, T4B, and T5B.

  The details of the configuration of the thickness measuring unit T1, the first outer diameter measuring units T2, T3, and the second outer diameter measuring units T4, T5 will be described later.

  The moving body K is arranged through wheels R1 to R4 disposed so as to surround the periphery of the cross section in the direction substantially perpendicular to the longitudinal direction of the pipe P to be measured (hereinafter referred to as “the periphery of the pipe”). It is a cart that moves along the longitudinal direction (Z direction) of the pipe P while pinching the periphery.

  Specifically, the moving body K includes a first frame member K1, a second frame member K2, a connecting member K3, and wheels R1 to R4 (see FIG. 2).

  The first frame member K1 is a frame member that is arranged on the + X direction side of the pipe P and is formed by framing a rod-shaped member, and the second frame member K2 is arranged on the −X direction side of the pipe P. This is a frame member in which a rod-shaped member is framed. And the 1st frame member K1 and the 2nd frame member K2 are arrange | positioned so that it may oppose on both sides of the piping P, and the frame surrounding the circumference | surroundings of the piping P is formed by connecting with the connection member K3. Hereinafter, it is also simply referred to as “frames K1, K2”). And the frame bodies K1 and K2 exhibit the shape surrounding the circumference | surroundings of the piping P so that it may have a fixed space | interval with respect to the circumference | surroundings of the piping P. FIG. In addition, the 1st frame member K1 and the 2nd frame member K2 are comprised by the arbitrary materials which an external shape does not change easily.

  For example, when the connecting member K3 is arranged so that the first frame member K1 and the second frame member K2 are opposed to each other with the pipe P interposed therebetween, the opposing portions are connected at an arbitrary length position to It is a fixing member that can be fixed. And when the 1st frame member K1 and the 2nd frame member K2 arrange | position so that it may oppose on both sides of the piping P, the both sides (the side of + Y direction with respect to the piping P, and -Y direction) Side) and is fixed by the connecting member K3. The first frame member K1 and the second frame member K2 are fixed by the connecting member K3 on the front side (+ Z direction) and the rear side (−Z direction) of the measuring apparatus. That is, when viewed in the YZ plane, each of the first frame member K1 and the second frame member K2 has a rectangular shape, and the first frame member K1 has rod-shaped members extending in the −X direction at its four corners. The two-frame member K2 has a rod-like member extending in the + X direction, and they are fixed at an arbitrary length position by the connecting member K3. And when attaching the mobile body K to the piping P, the 1st frame member K1 and the 2nd frame member K2 are connected by the connection member K3 so that the circumference | surroundings of the piping P may be clamped via wheel R1-R4. The Note that “clamping” means a state in which the periphery of the pipe P is pressed by the frame bodies K1 and K2 so that the movable body K can be held at a predetermined position of the pipe P.

  The wheel R1 and the wheel R2 are attached to the front side (+ Z direction) of the frame bodies K1, K2 so as to face each other across the pipe P in the X direction, and the wheel R3 and the wheel R4 are attached to the frame body K1, It is attached to the rear side (−Z direction) of K2 so as to face across the pipe P in the X direction. And the moving body K moves along a longitudinal direction (Z direction) by the wheel R1-R4 rotating in the direction (Z direction) along the longitudinal direction of the piping P. As shown in FIG.

  The wheels R <b> 1 to R <b> 4 exhibit a curved concave shape along the outer shape of the pipe P at the rim portion. The wheels R1 to R4 are arranged on the frame bodies K1 and K2 so that the shape along the outer periphery of the pipe P is in contact with the pipe P, and the axles extend in the Y direction of the frame bodies K1 and K2, respectively. Is supported rotatably. The wheels R <b> 1 to R <b> 4 are made of an elastic member, for example, an elastic rubber material, and are deformed according to the outer shape of the pipe P at the bulging portion of the pipe P. That is, the moving body K moves while holding the pipe P in a state where these wheels R1 to R4 are in contact with the pipe P, so that the shape of the frame bodies K1 and K2 is maintained. It moves along the central axis in the longitudinal direction of the lens without shifting in the X direction and the Y direction. The wheels R1 to R4 are examples of a guide member (second guide member) that guides the moving body K while sandwiching the outer peripheral surface of the pipe P so that the moving body K moves along the longitudinal direction of the pipe P. It is.

=== About thickness measurement part ===
Hereinafter, the configuration of the thickness measuring unit T1 will be described with reference to FIGS. 5 and 6 and FIGS. 3 to 4 described above.

  The thickness measuring unit T1 is an electromagnetic ultrasonic sensor (hereinafter also referred to as “electromagnetic ultrasonic sensor T1”), an electromagnetic ultrasonic transmitting / receiving unit T101, rollers T102 to T105, biasing springs T106 to T109, and a control unit T110 ( (Not shown). In addition, the dotted line in FIG. 5 represents the housing | casing of electromagnetic ultrasonic sensor T1.

  The electromagnetic ultrasonic sensor T1 transmits an ultrasonic wave having a predetermined frequency to the inner peripheral surface of the pipe P and receives an ultrasonic wave reflected and bounced off the inner peripheral surface of the pipe P by an electromagnetic method. The sensor measures the wall thickness of the pipe P by detecting the frequency at which resonance occurs.

  More specifically, the electromagnetic ultrasonic transmission / reception unit T101 includes a transmission coil T101A, a reception coil T101B, and a permanent magnet T101C. These are used to transmit ultrasonic waves to the inner peripheral surface of the pipe P, and The ultrasonic wave reflected and bounced off the inner peripheral surface is received. The transmission coil T101A and the reception coil T101B are planar coils configured by winding a conductive wire in the outer peripheral direction, and a surface formed by winding the conductive wire (hereinafter referred to as “measurement surface”) is a pipe P. Are arranged so as to oppose the surface of the measurement position at a certain interval and substantially in parallel (hereinafter also referred to as “transmission / reception coils T101A, T101B”). In the present embodiment, the transmission coil T101A and the reception coil T101B are shown using the same coil, but different coils may be used.

  The permanent magnet T101C is a magnet (the S pole on the pipe P side) around the center magnet (the N pole facing the pipe P side) through a non-magnetic material and the N and S poles of the magnetic poles are opposite to each other. The magnet is surrounded by a magnet). The surface of the permanent magnet T101C in which the N and S poles of the magnetic poles are staggered has a certain interval with respect to the surface of the measurement position of the pipe P across the transmission / reception coils T101A and T101B, and Are arranged so as to face each other substantially in parallel.

  The electromagnetic ultrasonic transmission / reception unit T101 is controlled by the control unit T110 to induce an eddy current that periodically fluctuates on the surface of the pipe P by applying an alternating current to the transmission coil T101A, and the eddy current and the permanent magnet Longitudinal ultrasonic waves are transmitted to the inner peripheral surface (depth direction) of the pipe P by the Lorentz force generated by the magnetic field of T101C. On the other hand, the electromagnetic ultrasonic wave transmitting / receiving unit T101 is configured to reverse the vibration of the surface of the pipe P that is generated when the ultrasonic wave transmitted to the inner peripheral surface of the pipe P is reflected by the inner peripheral surface of the pipe P. Thus, it is detected as an electromotive force by the receiving coil T101B.

  The control unit T110 is a CPU that controls the electromagnetic ultrasonic sensor T1 according to a computer program. The control unit T110 supplies an alternating current having a predetermined frequency to the transmission coil T101A. Further, the control unit T110 acquires an electromotive force detected through the reception coil T101B. And control part T110 changes the frequency of the alternating current supplied to transmitting coil T101A, and measures the thickness of piping P by detecting the frequency when resonance occurs.

  Since the electromagnetic ultrasonic sensor T1 transmits and receives ultrasonic waves by an electromagnetic method, the thickness of the pipe P can be measured without any vibration medium interposed between the pipe P to be measured. It has the characteristics. That is, in this embodiment, by using the electromagnetic ultrasonic sensor T1, ultrasonic waves can be transmitted and received without performing pretreatment such as removal and polishing of deposits and oxide films adhering to the surface of the pipe P. Is possible. On the other hand, depending on the positional relationship between the measurement surfaces of the transmission / reception coils T101A and T101B and the surface of the measurement position of the pipe P, the measurement accuracy becomes unstable.

  Therefore, in the electromagnetic ultrasonic sensor T1 according to this embodiment, the measurement surfaces of the transmission / reception coils T101A and T101B are at a certain distance from the surface of the measurement position of the pipe P at each point in the longitudinal direction of the pipe P (in FIG. 5). And is attached to the movable body K so as to face the surface of the measurement position of the pipe P substantially in parallel. With this configuration, the electromagnetic ultrasonic sensor T1 can continuously measure the thickness of the pipe P with high accuracy.

  Specifically, the electromagnetic ultrasonic sensor T1 is attached to the frame bodies K1 and K2 of the moving body K via biasing springs T106 to T109 so as to press in the direction of the surface of the position to be measured on the pipe P. The surface of the housing of the electromagnetic ultrasonic sensor T1 facing the pipe P surrounds the transmission / reception coils T101A and T101B, and is a roller formed of a highly rigid material such as stainless steel so as to contact the pipe P. T102 to T105 are attached. The transmission / reception coils T101A and T101B are at a certain distance from the surface of the measurement position of the pipe P at each point in the longitudinal direction of the pipe P by the biasing springs T106 to T109 and the rollers T102 to T105. Maintained. The moving body K moves while holding the pipe P in a state where the wheels R1 to R4 are in contact with the pipe P, so that the moving body K moves along the central axis in the longitudinal direction of the pipe P, that is, in the X direction and the Y direction. Move without shifting in the direction. Therefore, the transmission / reception coils T101A and T101B of the electromagnetic ultrasonic sensor T1 attached to the moving body K also move so as to face the surface of the measurement position of the pipe P substantially in parallel. The rollers T102 to T105 are guide members that contact the pipe P (first) in order to maintain the measurement surface of the electromagnetic ultrasonic sensor T1 at a certain distance from the surface of the measurement position of the pipe P. It is an example of a guide member.

  In this embodiment, in order to grasp the measurement position (Z coordinate) in the longitudinal direction of the pipe P, a rotary encoder is provided on any of the rollers T102 to T105 of the wall thickness measurement unit T1 (not shown). The electromagnetic ultrasonic sensor T1 is configured to be able to detect a measurement position in the Z direction by acquiring measurement data of the rotary encoder.

=== About the outer diameter measuring part ===
Hereinafter, with reference to FIGS. 7A and 7B and FIGS. 3 to 4 described above, configurations of the first outer diameter measuring units T2 and T3 and the second outer diameter measuring units T4 and T5 will be described. For ease of understanding, the mirrors M1 and M2 are omitted in FIGS. 7A and 7B.

= 1st outer diameter measuring part =
The first outer diameter measuring section T2 and the first outer diameter measuring section T3 are independent laser dimension measuring apparatuses (hereinafter also referred to as “laser dimension measuring apparatuses T2, T3”), and the emission sections T2A, T3A, Light receiving units T2B and T3B and control units T2C and T3C (not shown) are provided.

  The emitting portions T2A and T3A are configured to include, for example, a semiconductor light emitting element, a laser diffusion unit, and a collimator lens. The GaN laser generated by the semiconductor light emitting element is diffused by the laser diffusion unit, and is transmitted in the Y direction via the collimator lens. Are emitted in a direction perpendicular to the longitudinal direction of the pipe P (+ X direction) as laser parallel rays L2 and L3 having a certain width. The light receiving portions T2B and T3B are configured to include, for example, a photodetector and a telecentric optical system, and lasers (lasers that have passed through) other than the portion of the laser parallel rays L2 and L3 that are shaded by the pipe P, The laser beam condensed by the telecentric optical system is measured by the photodetector. The control units T2C and T3C are CPUs for controlling the first outer diameter measuring unit T2 and the first outer diameter measuring unit T3 according to the computer program, respectively, and the operations of the emitting units T2A and T3A and the light receiving units T2B and T3B. And the width of the laser received by the light receiving portions T2B and T3B is calculated. And the outer diameter Py of the Y direction of the piping P is calculated by synthesize | combining the measurement result of laser dimension measuring apparatus T2, and the measurement result of laser dimension measuring apparatus T3.

  More specifically, the frames K1 and K2 are arranged such that the emitting part T2A and the light receiving part T2B of the laser dimension measuring apparatus T2 are opposed to the pipe P at the −Y side position with the pipe P in the X direction. Attached to. Further, the emitting part T3A and the light receiving part T3B of the laser dimension measuring device T3 are attached to the pipes P of the frames K1 and K2 so as to face each other with the pipe P interposed in the X direction at a position on the + Y side. Then, the light receiving unit T2B receives the laser parallel beam L2 emitted from the emitting unit T2A in the + X direction with respect to the pipe P, thereby measuring the dimension on the −Y side of the pipe P, and the light receiving unit T3B is used as the emitting unit T3A. Therefore, by receiving a laser parallel beam L3 emitted in the + X direction with respect to the pipe P, the dimension on the + Y side of the pipe P is measured. As will be described later, the emission part T2A and the emission part T3A change the path of the laser parallel rays L2 and L3 via the mirror M1, and have a constant width from the −X direction to the Y direction with respect to the pipe P. The laser parallel rays L2 and L3 having

  The calculation of the outer diameter Py in the Y direction of the pipe P is performed, for example, after the laser dimension measuring devices T2 and T3 perform measurement at each point in the longitudinal direction of the pipe P, and then the respective measurement data (position in the Z direction, emission part) The laser parallel rays L2 and L3 emitted from T2A and T3A are transmitted in the Y direction, and the laser parallel rays L2 and L3 received by the light receiving portions T2B and T3B are transmitted to the arithmetic unit (not shown). , Using an arithmetic unit. At this time, the arithmetic device extracts measurement data at the same point in the longitudinal direction of the pipe P of the laser dimension measurement devices T2 and T3 based on the position data in the Z direction among the measurement data, and the emission portions T2A and T3A. Of the parallel laser beams L2 and L3 emitted in the Y direction and a predetermined interval between the laser dimension measuring device T2 and the laser dimension measuring device T3 (the interval between the emitting portion T2A and the emitting portion T3A, and the light receiving portion T2B). By subtracting the width in the Y direction of the laser parallel rays L2 and L3 received by the light receiving portions T2B and T3B from the width in the Y direction obtained by adding the interval between the light receiving portions T3B), each point in the longitudinal direction of the pipe P The outer diameter Py in the Y direction at is calculated. Each of the laser dimension measuring devices T2 and T3 detects the measurement position in the Z direction by acquiring the measurement data of the rotary encoder provided on any of the rollers T102 to T105 of the above-described thickness measuring unit T1. It is the structure which can do.

= 2nd outer diameter measuring part =
The second outer diameter measuring unit T4 and the second outer diameter measuring unit T5 are independent laser distance measuring devices (hereinafter also referred to as “laser distance measuring devices T4 and T5”), and the emitting units T4A and T5A, respectively. , Light receiving units T4B and T5B, and control units T4C and T5C.

  The emitting portions T4A and T5A are each configured to include a modulation signal oscillator and a semiconductor light emitting element, for example, and direct linear He-Ne laser beams L4 and L5 subjected to intensity modulation at a high frequency toward the measurement position of the pipe P. And exit. Each of the light receiving portions T4B and T5B includes, for example, a photodetector and a phase meter. The laser beams L4 and L5 reflected from the measurement position of the pipe P by the photodetector and the internal reference standard The laser beam is received, and the phase difference of the modulated wave between them is measured by a phase meter. The control units T4C and T5C are CPUs for controlling the second outer diameter measuring unit T4 and the second outer diameter measuring unit T5 according to the computer program, respectively, and the operations of the emitting units T4A and T5A and the light receiving units T4B and T5B. Are controlled, and the distance between the point where the laser beams L4 and L5 of the pipe P are reflected and the laser distance measuring devices T4 and T5 is calculated based on the measured phase difference (phase difference method). Then, the outer diameter Px of the pipe P in the X direction is calculated by combining the measurement result of the laser distance measurement device T4 and the measurement result of the laser distance measurement device T5.

  More specifically, the laser distance measuring device T4 and the laser distance measuring device T5 are attached to the frames K1 and K2 so as to face each other in the X direction across the position of the central axis in the longitudinal direction of the pipe P. Then, the laser distance measuring device T4 measures the dimension (distance) on the −X side of the pipe P by the light receiving portion T4B receiving the laser beam L4 emitted from the emitting portion T4A, and the light receiving portion T5B is the emitting portion. By receiving the laser beam L5 emitted from T5A, the dimension (distance) on the + X side of the pipe P is measured. As will be described later, the emission part T4A and the emission part T5A change the paths of the laser beams L4 and L5 via the mirrors M1 and M2, and are linear laser beams from the ± X direction with respect to the pipe P. L4 and L5 are emitted.

  The calculation of the outer diameter Px in the X direction of the pipe P is performed, for example, after the laser distance measuring device T4 and the laser distance measuring device T5 perform measurement at each point in the longitudinal direction of the pipe P, and then the respective measurement data (Z direction The position, the point where the laser of the pipe P is reflected, and the distance between the laser distance measuring devices T4 and T5) are transmitted to an arithmetic device (not shown), and are performed by the arithmetic device. At this time, the arithmetic device extracts the measurement data at the same point in the longitudinal direction of the pipe P of the laser distance measuring devices T4 and T5 based on the position data in the Z direction among the measurement data, and the laser of the pipe P is used. Subtract the distance between the mirrors M1 and M2 and the laser distance measuring devices T4 and T5 from the sum of the reflected point, the distance between the laser distance measuring devices T4 and T5, and the initial outer diameter of the pipe P. Thus, the outer diameter Px in the X direction at each point in the longitudinal direction of the pipe P is calculated. Each of the laser distance measuring devices T4 and T5 detects the measurement position in the Z direction by acquiring the measurement data of the rotary encoder provided on any of the rollers T102 to T105 of the above-described thickness measuring unit T1. It is the structure which can do.

  As described above, the moving body K according to the present embodiment maintains the shapes of the frames K1 and K2 by moving while holding the pipe P in a state where the wheels R1 to R4 are in contact with the pipe P. In the state, it moves along the central axis in the longitudinal direction of the pipe P without shifting in the X direction and the Y direction. Therefore, the first outer diameter measuring units T2, T3, the second outer diameter measuring units T4, T5 are respectively the coordinates used as the reference for the measurement position of the pipe P and the reference for the measurement position of the pipe P before and after the movement. The moving body K is configured to move integrally with the frames K1 and K2 of the moving body K so that the moving direction is maintained constant. That is, the emission positions and emission directions of the laser parallel light beams L2 and L3 of the laser dimension measuring devices T2 and T3 with respect to the measurement position of the pipe P are kept constant before and after the movement. Similarly, the emission positions and emission directions of the laser beams L4 and L5 of the laser distance measuring devices T4 and T5 with respect to the measurement position of the pipe P are maintained constant before and after the movement. Thereby, the laser dimension measuring devices T2 and T3 and the laser distance measuring devices T4 and T5 can continuously measure the pipe P while moving along the longitudinal direction. Note that the electromagnetic ultrasonic sensor T1, the laser dimension measuring devices T2, T3, and the laser distance measuring devices T4, T5 can measure without moving the positioning as described above. It is good also as measuring wall thickness and an outer diameter continuously, moving, and good also as measuring at fixed intervals (for example, 10 cm).

= Arrangement of outer diameter measuring part =
Next, arrangement of an outer diameter measuring unit (laser dimension measuring apparatus T2, laser dimension measuring apparatus T3, laser distance measuring apparatus T4, laser distance measuring apparatus T5) for reducing the size of the measuring apparatus in the X direction and the Y direction. The configuration will be described. FIG. 8 is a plan view showing the positional relationship between the pipe and the measuring device taken along line AA ′ in FIG. 3A. As shown in FIG. 1, the pipe used for the boiler is composed of a large number of thin pipes (for example, 50 mm in diameter) extending substantially in parallel, and the interval between the pipes is approximately the same as the pipe diameter. Is in a dense state. In particular, the interval between the pipes is such that the width Fy in the Y direction is narrower than the width Fx in the X direction. On the other hand, since the laser dimension measuring device and the laser distance measuring device need to store the optical system for emitting the laser in the casing, a certain size is required in the laser emitting direction, and even a small one is required. It exhibits a shape extending in the laser emission direction. In consideration of these, the measuring apparatus according to the present embodiment has the following configuration in order to reduce the size in the X direction and the Y direction.

  First, the measuring apparatus according to the present embodiment is configured to measure the outer diameter Py in the Y direction of the pipe P using two laser dimension measuring apparatuses, a laser dimension measuring apparatus T2 and a laser dimension measuring apparatus T3. The laser distance measuring device T4 is installed in the region between the emitting unit T2A and the emitting unit T3A, and the laser distance measuring device T5 is installed in the region between the light receiving unit T2B and the light receiving unit T3B. Thereby, without attaching the apparatus for measuring the outer diameter etc. of the piping P to the side surface of the movable bodies K on the ± Y side of the frames K1, K2, the two laser dimension measuring devices T2, T3 The outer diameter Py in the Y direction can be measured, and the outer diameter Px in the X direction of the pipe P can be measured by the two laser distance measuring devices T4 and T5.

  Secondly, the measuring apparatus according to the present embodiment directs the laser emission direction of the emission parts T2A, T3A, T4A, T5A of the laser dimension measuring apparatuses T2, T3, laser distance measuring apparatuses T4, T5 to the + Z direction, The paths of the lasers L2, L3, L4, and L5 are changed using the mirrors M1 and M2, and the light receiving directions of the light receiving units T2B, T3B, T4B, and T5B are set in the −Z direction.

  Specifically, the emission units T2A and T3A of the laser dimension measuring apparatuses T2 and T3 are attached to the moving body K so that the emission direction is along the longitudinal direction of the pipe P, and the light receiving units T2B and T3B are similarly configured. The light receiving direction is attached to the moving body K so as to be along the longitudinal direction of the pipe P (+ Z direction). The emitting portions T2A and T3A emit laser parallel rays L2 and L3 in a direction along the longitudinal direction of the pipe P (+ Z direction), and the laser parallel rays L2 and L3 emitted in the + Z direction are directed to the mirror M1. The reflected laser beam is changed in the + X direction perpendicular to the longitudinal direction of the pipe P. Of the laser parallel rays L2 and L3, lasers other than the shadowed part of the pipe P are reflected by the mirror M2, and − The route can be changed in the Z direction. With this configuration, the light receiving portions T2B and T3B receive the laser parallel rays other than the shadowed portion of the pipe P among the laser parallel rays L2 and L3 reflected from the mirror M2. Similarly, the emitting portions T4A and T5A of the laser distance measuring devices T4 and T5 are attached to the moving body K so that the emitting direction is along the longitudinal direction of the pipe P, and the light receiving portions T4B and T5B are also in the light receiving direction. Is attached to the movable body K along the longitudinal direction of the pipe P (+ Z direction). The emitting portions T4A and T5A emit linear laser beams L4 and L5 in a direction along the longitudinal direction of the pipe P (+ Z direction), and the laser beams L4 and L5 emitted in the + Z direction are respectively Reflected by the mirrors M1 and M2, the path can be changed in the + X direction and the −X direction perpendicular to the longitudinal direction of the pipe P. The laser beams L4 and L5 are reflected on the surface of the measurement position of the pipe P and then reflected on the mirrors M1 and M2, respectively, so that the path is changed in the longitudinal direction -Z direction of the pipe P. With this configuration, the light receiving portions T4B and T5B receive the laser beams L4 and L5 reflected from the mirrors M1 and M2. The reflecting surfaces of the mirrors M1 and M2 have shapes that can change the laser parallel rays L2 and L3 and the laser rays L4 and L5 to the above-described paths.

  In the present embodiment, creep damage or oxidation thinning of the pipe P is detected based on at least one of the thickness reduction amount of the pipe P or the bulge amount of the outer diameter. On the other hand, depending on the material of the pipe P or how the stress is applied to the pipe P, creep damage may be detected only by the thickness reduction amount or the outer diameter expansion amount. For example, if oxidation thinning occurs in the pipe P at the same time as the expansion, the outer diameter may not change even if the expansion occurs. Therefore, as described above, the measuring apparatus according to the present embodiment is configured to be able to continuously measure both the wall thickness and the outer diameter over each point in the longitudinal direction of the pipe P, based on the measurement results. In addition, it is possible to detect creep damage and oxidation thinning.

  If it is determined that one of creep damage or oxidation thinning is proceeding dominantly, the remaining life is determined based only on one of the thinning amount of the pipe or the bulging amount of the outer diameter of the pipe. You may judge. In that case, the relationship between the pipe thinning amount and the remaining life, or the relationship between the bulging amount of the outer diameter of the piping and the remaining life, is the same type as the piping P to be measured (for example, the same material and the same thickness). The remaining life may be evaluated based on the detection result of creep damage or oxidation thinning by performing an experiment on the pipe P. On the other hand, if it is determined that both creep damage and oxidation thinning have progressed, it is difficult to determine the remaining life with only one value of creep damage or oxidation thinning. A detailed remaining life evaluation may be performed by a crystal grain deformation method by observing the structure of a replica collected by polishing the surface of a portion where damage or oxidation thinning is detected.

  And the time of replacement | exchange of pipe | tube P and repair is judged based on the detection result of creep damage or oxidation thinning. At this time, the thickness reduction / expansion amount of the reference pipe is an amount reduced with respect to the thickness of the design standard pipe and an amount expanded with respect to the outer diameter, respectively. Alternatively, the degree of reduction relative to the wall thickness of the design standard pipe, or the degree of expansion (ratio) with respect to the outer diameter of the design standard pipe may be used. In addition, the thickness / outside diameter of the pipe P is equal to the thickness / outside diameter of the pipe P when the thickness / outside diameter of the pipe P is constant over the length direction in the design standard. It can be calculated by subtracting the constant value from the measurement result. Further, if not constant, the thickness / outer diameter of the pipe P is measured in advance in each point in the length direction (Z direction) before the pipe P is thinned / bulged, and is associated with the point. The thickness / outer diameter stored in advance and associated with the point of the pipe P measured in advance can be calculated by comparing the thickness / outer diameter after thickness reduction / bulging.

  In addition, when determining creep damage and oxidation thinning based on the measurement result of the thickness / outer diameter of the pipe at each point in the longitudinal direction of the pipe P, the calculation process includes the first outer diameter measuring unit T2, Similar to the calculation processing of T3, the second outer diameter measurement unit T4, T5, other calculation devices may perform, or the thickness measurement unit T1, the first outer diameter measurement unit T2, T3, the second outer diameter measurement unit. Each of T4 and T5 may be provided as its functional configuration. For example, after measuring at each point in the longitudinal direction of the pipe P, the measuring device performs creep of the pipe at each point in the longitudinal direction of the pipe based on the measurement result of the thickness / outer diameter. You may provide the structure which displays damage and oxidation thinning so that identification is possible.

  In addition, the measuring apparatus has a creep damage or oxidation thinning in each of the thickness measuring unit T1, the first outer diameter measuring unit T2, T3, and the second outer diameter measuring unit T4, T5. Set the amount of thinning / bulging as a threshold indicating the time of repair, and determined that the amount of thinning / bulging at the position to be measured exceeds the amount of thinning / bulging as the threshold In this case, a function (warning unit) that issues a warning by sound or the like may be provided. As a result, the operator can determine the time for replacement and repair by an extremely simple operation. As the creep damage of the pipe progresses, the degree of progress becomes faster, and the thinning / bulging also increases abruptly, leading to breakage. Therefore, for example, by setting the thinning amount / bulging amount at the time when the progress degree becomes fast as a threshold value for issuing a warning, it is possible to reliably prevent the pipe from being broken.

  As described above, according to the measurement apparatus according to the present embodiment, the measurement surface of the electromagnetic ultrasonic sensor T1 is maintained at a certain distance from the surface of the measurement position of the pipe P at each point in the longitudinal direction of the pipe P. And it can be set as the structure which opposes substantially parallel with respect to the surface of the measurement position of the piping P. As shown in FIG. Accordingly, it is possible to continuously measure the thickness of the pipe P with high accuracy without performing pretreatment such as cleaning and polishing on the pipe P.

  Moreover, according to the measuring apparatus which concerns on this embodiment, the mobile body K exhibits the shape which surrounds the outer peripheral surface of the piping P, and is comprised by the elastic member arrange | positioned so that the circumference | surroundings of the outer peripheral surface of the piping P may be surrounded. The electromagnetic ultrasonic sensor T1 can continuously measure the wall thickness of the pipe P even at a location where the pipe P bulges because the pipe P moves while holding the outer peripheral surface of the pipe P via R1 to R4. In addition, the direction in which the emitting portions T2A and T3A of the laser dimension measuring devices T2 and T3 emit the laser parallel rays L2 and L3 with respect to the measurement position, and the distance between the emitting portions T2A and T3A and the light receiving portions T2B and T3B are also constant. The configuration is maintained. Similarly, the direction in which the emitting portions T4A and T5A of the laser distance measuring devices T4 and T5 emit the laser beams L4 and L5 with respect to the measurement position and the distances of the laser distance measuring devices T4 and T5 are also maintained constant. . Therefore, it is possible to continuously measure both the wall thickness and the outer diameter at each point in the longitudinal direction of the pipe P, and it is possible to reliably detect a portion that may be creep damaged.

<Other embodiments>
In the above embodiment, the movable body K is provided with the first outer diameter measuring parts T2, T3 and the second outer diameter measuring parts T4, T5. However, the creep damage of the pipe P is only measured by the thickness. These configurations are not necessary if they can be detected reliably. Also, in the case of providing a configuration for measuring the outer diameter of the pipe P, the mirrors M1, M2, etc. may be omitted or the arrangement relationship thereof may be appropriately determined according to the separation state between the pipe P to be measured and the surrounding pipe. It is possible to change. In addition, the configuration for measuring the outer diameter of the pipe P may use a digital caliper or the like instead of the laser dimension measuring device or the laser distance measuring device. In this case, for example, the first measuring member and the second measuring member formed of stainless steel or the like are placed on the moving body K so as to face each other with the pipe P sandwiched in a direction substantially perpendicular to the longitudinal direction of the pipe P. The moving body K may be configured to be movable while attaching and abutting them to the pipe P.

  In the above embodiment, the movable body K is surrounded by the pipe P so as to move the movable body K along the central axis in the longitudinal direction of the pipe P while maintaining the shapes of the frames K1 and K2. It is configured to move along the longitudinal direction of the pipe P while sandwiching the periphery thereof through the elastic members (wheels R1 to R4) disposed in the pipe P. However, if there is a guide member (rollers T102 to T105, etc.) that is interposed between the electromagnetic ultrasonic sensor T1 and the pipe P and guides the moving body K, it is between the electromagnetic ultrasonic sensor T1 and the pipe P. The moving body K can move so that the distance is maintained at a constant distance, and according to the configuration of the first outer diameter measuring units T2, T3, the second outer diameter measuring units T4, T5, etc. The aspect can be variously changed. For example, the moving body K may be configured to move along a rail laid along the longitudinal direction of the pipe P. Further, instead of the rollers T102 to T105 formed of a highly rigid material, the guide member may be made of a highly rigid material whose surface is coated with a lubricating oil, such as stainless steel.

  Moreover, in the said embodiment, although the wheel R1-R4 comprised with an elastic rubber material was used as an elastic member arrange | positioned so that the circumference | surroundings of the piping P might be enclosed, it replaced with wheel R1-R4 and was urged | biased spring Alternatively, a buffer material may be disposed in the frames K1 and K2 so as to surround the periphery of the pipe P, and these may be interposed between the pipe P and the moving body K.

  Moreover, in the said embodiment, although it was set as the structure which transmits / receives an ultrasonic wave using Lorentz force as electromagnetic ultrasonic sensor T1 which measures the thickness of piping, the material of piping P is ferromagnetics, such as steel. In such a case, a configuration may be adopted in which ultrasonic waves are transmitted and received using the magnetostrictive effect.

  Each of the above embodiments discloses an invention specified by the following description.

  The main present invention for solving the above-described problem is that the electromagnetic ultrasonic sensor T1 for measuring the thickness of the pipe P and the electromagnetic ultrasonic sensors T1A and T101B of the electromagnetic ultrasonic sensor T1 are opposed to the outer peripheral surface of the pipe P. The movable body K to which the acoustic wave sensor T1 is attached and moves along the longitudinal direction of the pipe P, and when the movable body K moves along the longitudinal direction of the pipe P, between the electromagnetic ultrasonic sensor T1 and the pipe P The first guide members T102 to T105 are provided between the electromagnetic ultrasonic sensor T1 and the pipe P so as to guide the moving body K so that the distance is maintained at a constant distance. Measuring device. Thereby, it is possible to continuously measure the thickness of the pipe P with high accuracy without performing pretreatment such as cleaning and polishing on the pipe P.

  The measuring apparatus further includes biasing members T106 to T109 that are interposed between the moving body K and the electromagnetic ultrasonic sensor T1 and press the electromagnetic ultrasonic sensor T1 toward the outer peripheral surface of the pipe P. May be.

  The first guide members T102 to T105 may be a plurality of rollers.

  The movable body K has a shape surrounding the outer peripheral surface of the pipe P, and guides the movable body K while holding the outer peripheral surface of the pipe P so that the movable body K moves along the longitudinal direction of the pipe P. It may further include second guide members R1 to R4.

  Further, the second guide members R <b> 1 to R <b> 4 may be configured by an elastic member disposed so as to surround the periphery of the outer peripheral surface of the pipe P. As a result, the movable body K can move along the central axis in the longitudinal direction of the pipe P in a state where the shapes of the frames K1 and K2 are maintained. That is, before and after the movement, the electromagnetic ultrasonic sensor T1 can be maintained parallel to the surface of the measurement position of the pipe P.

  Further, light emitting portions T2A and T3A that emit laser parallel rays L2 and L3 having a certain width with respect to a direction substantially perpendicular to the longitudinal direction of the pipe P, and light receiving portions T2B and T3B that receive the laser parallel rays L2 and L3. Are attached to the movable body K so as to face each other across the pipe P in a direction substantially perpendicular to the longitudinal direction of the pipe P, and among the laser parallel rays L2 and L3 emitted from the emission parts T2A and T3A, the light receiving part T2B , T3B may further include laser dimension measuring devices T2 and T3 that measure the outer diameter of the pipe P based on the laser parallel rays L2 and L3 that are not received. This makes it possible to continuously measure both the wall thickness and the outer diameter of the pipe.

  In addition, the measuring device has a warning unit that issues a warning indicating that creep damage or oxidation is reduced based on the measurement result of the thickness and outer diameter of the pipe P measured at each point in the longitudinal direction of the pipe P. Further, it may be provided. As a result, the operator can determine creep damage and oxidation thinning by an extremely simple operation.

  Further, the pipe to be measured may be a pipe P used for a boiler.

  As mentioned above, although the specific example of this invention was demonstrated in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

P Piping K Moving object T1 Thickness measuring part T2, T3 First outer diameter measuring part T4, T5 Second outer diameter measuring part M1, M2 Mirror

The main present invention that solves the above-described problems includes an electromagnetic ultrasonic sensor that measures the thickness of a pipe, a laser dimension measuring device that measures the outer diameter of the pipe, and a measurement surface of the electromagnetic ultrasonic sensor that is the surface of the pipe. The electromagnetic ultrasonic sensor is attached so as to face the outer peripheral surface, exhibits a shape surrounding the outer peripheral surface of the pipe, and moves along the longitudinal direction of the pipe. When moving along the direction, the movement is interposed between the electromagnetic ultrasonic sensor and the pipe so that the distance between the electromagnetic ultrasonic sensor and the pipe is maintained at a constant distance. When the movable body moves along the longitudinal direction of the pipe , the first guide member that guides the body guides the movable body while sandwiching the outer circumferential surface of the pipe, and the outer circumferential surface of the pipe To surround A second guide member constituted by an elastic member disposed, wherein the laser dimension measuring device emits a first laser parallel beam having a constant width in a cross-sectional direction substantially perpendicular to the longitudinal direction of the pipe, A first light emitting unit that emits light, a first light receiving unit that receives the first laser parallel light beam, and a second laser parallel light beam having a certain width in the cross-sectional direction of the pipe are emitted from the first laser parallel light beam. A second light emitting portion that emits parallel to the direction, a second light receiving portion that receives the second laser parallel light beam, and a control portion that calculates an outer diameter of the pipe, the first light emitting portion and the The second emission part is disposed so as to be separated from each other in the cross-sectional direction of the pipe, and a part of the first laser parallel beam and a part of the second laser parallel beam are respectively blocked by the pipe, The first light receiving part and the second light receiving part It arrange | positions so that the said 1st radiation | emission part and the said 2nd radiation | emission part may be opposed on both sides of piping, and the said control part is a said 1st light reception among the said 1st laser parallel rays radiate | emitted from the said 1st radiation | emission part. On the basis of the width of the portion received by the portion and the width of the portion received by the second light receiving portion of the second laser parallel light emitted from the second emitting portion. It is a measuring device characterized by calculating a diameter . Other features of the present invention will become apparent from the accompanying drawings and the description of this specification.

Claims (8)

An electromagnetic ultrasonic sensor for measuring the thickness of the pipe;
The electromagnetic ultrasonic sensor is attached so that the measurement surface of the electromagnetic ultrasonic sensor faces the outer peripheral surface of the pipe, and a moving body that moves along the longitudinal direction of the pipe;
When the movable body moves along the longitudinal direction of the pipe, the electromagnetic ultrasonic sensor and the pipe are arranged so that the distance between the electromagnetic ultrasonic sensor and the pipe is maintained at a constant distance. A first guide member for guiding the movable body interposed between
A measuring apparatus comprising: The measuring apparatus according to claim 1, further comprising an urging member that presses the first guide member in a direction of an outer peripheral surface of the pipe. The measuring apparatus according to claim 1, wherein the first guide member is a plurality of rollers. The movable body has a shape surrounding the outer peripheral surface of the pipe,
The second guide member for guiding the moving body while sandwiching the outer peripheral surface of the pipe so that the moving body moves along the longitudinal direction of the pipe. 4. The measuring device according to any one of 3. The measuring apparatus according to claim 4, wherein the second guide member is configured by an elastic member disposed so as to surround the periphery of the outer peripheral surface of the pipe. A light emitting portion for emitting a laser parallel light beam having a certain width with respect to a direction substantially perpendicular to the longitudinal direction of the pipe, and a light receiving portion for receiving the laser parallel light beam are substantially perpendicular to the longitudinal direction of the pipe. Attached to the moving body so as to face each other with the piping interposed therebetween,
The apparatus further comprises a laser dimension measuring device that measures an outer diameter of the pipe based on a laser parallel beam that has not been received by the light receiving unit among the laser parallel beams emitted by the emitting unit. Item 6. The measuring device according to Item 5. The measuring device is a warning unit that issues a warning indicating that creep damage or oxidation thinning based on the measurement results of the thickness and outer diameter of the pipe measured at each point in the longitudinal direction of the pipe, The measuring apparatus according to claim 6, further comprising: The measurement apparatus according to claim 1, wherein the pipe is a pipe used for a boiler.

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