JP5740135B2 - Plate thickness measuring device - Google Patents

Description

  The present invention relates to a plate thickness measuring apparatus, and more particularly, to a plate thickness measuring apparatus capable of measuring the thickness of the ground and the underground where it cannot be directly measured from the outer surface.

  A method for measuring the corrosion state of a steel pipe column at a ground portion in contact with soil is disclosed in, for example, Japanese Patent Laid-Open No. 5-126804 (Patent Document 1). According to the publication, an ultrasonic probe is inserted through a hole for fixing a scaffolding nail of a steel pipe column, and the inserted balloon is inflated to bring the ultrasonic probe into contact with the inner surface of the steel pipe column. It is measured using. Specifically, the ultrasonic probe is driven to input ultrasonic waves to the steel pipe column and the like, and at the same time, the ultrasonic probe receives multiple reflected ultrasonic waves on the outer surface side and the inner surface side of the steel tube column. By calculating the periodicity of the multiple reflected ultrasonic waves from the received ultrasonic waves and comparing the received ultrasonic data with the corrosion amount obtained separately in advance, the thickness of the steel tube column outer surface side By determining the deterioration status, the underground corrosion is measured without digging up the steel pipe column.

Japanese Patent Laid-Open No. 5-126804

  A conventional method for measuring the underground corrosion of a steel pipe column has been performed as described above. Although it was possible to measure without excavating the periphery of the steel pipe column, according to this method, it takes time to measure the entire steel pipe column because the probe is pressed and fixed with an inflated balloon. There was a problem.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a plate thickness measuring device that can easily measure the degree of corrosion of the steel pipe column at the ground and underground.

  The plate thickness measuring apparatus according to the present invention includes a scanning unit for holding a probe and a control unit for controlling the scanning unit, and the scanning unit is placed at a desired position on the inner periphery of the cylindrical steel pipe column. The thickness of the steel pipe column is measured using a probe. In the plate thickness measuring device, the positioning means for positioning the probe held by the scanning unit at a desired position on the inner periphery of the steel pipe column, and scanning when the probe is placed at the desired position by the positioning means. Moving means for moving the section along the inner circumference of the steel pipe column, and transmission means for transmitting the flaw detection data detected by the probe to the control section.

  Preferably, the moving means includes a magnet roller that moves while the scanning unit is in contact with the inner periphery of the steel pipe column. The probe may also include a magnet roller that moves while contacting the inner periphery of the steel pipe column.

  The scanning unit may include a magnet.

  Since the probe is held by the scanning unit and moved and measured at a desired position inside the steel pipe column, measurement of a desired portion of the steel pipe column can be easily performed.

  As a result, it is possible to provide a plate thickness measuring device that can easily measure the thickness of the underground and underground portions of the steel pipe column.

It is a figure which shows the principal part of the plate | board thickness measuring apparatus which concerns on this invention. It is a block diagram which shows the principal part of a plate thickness measuring apparatus. It is a figure which shows the scanning part mounted in the probe sending jig | tool. It is a figure which shows the flaw detection state of a probe. It is a figure which shows the state which attached the probe to the scanning part. It is a figure which shows the scanning part which attached the probe. It is a flowchart which shows operation | movement of a plate thickness measuring apparatus. It is a flowchart which shows the content of the measurement process shown by S15 of FIG.

  An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram (FIG. 1 (A)) showing a use state of a plate thickness measuring apparatus according to this embodiment, and a state of the scanning unit 20 at the time of plate thickness measurement in a steel pipe column 42, which is a measurement target. FIG. 2 is a diagram (FIG. 1B) of the steel pipe column 42 seen from above, and FIG. 2 is a block diagram showing the overall configuration of the plate thickness measuring apparatus.

  With reference to FIG. 1 and FIG. 2, the plate | board thickness measuring apparatus 10 which concerns on this Embodiment measures the corrosion state of the steel pipe column 42 in the subsurface part 41 which is contacting with soil. Measurements below the ground are also possible. Here, the steel pipe column 42 is, for example, a cylindrical member that fixes the guard rail. The plate thickness measuring apparatus 10 includes a scanning unit (moving means) 20 that detachably holds a probe 11 that measures a plate thickness in a steel pipe column 42 and a control unit 30 connected to the scanning unit 20. The scanning unit 20 is positioned at a desired plate thickness measurement position by a probe feeding jig described later. The scanning unit 20 and the control unit 30 are connected by a transmission line 25. Supply of power from the control unit 30 to the scanning unit 20, transmission of control signals for the scanning unit, measurement data from the scanning unit, and the like are performed via the transmission line 25.

  The control unit 30 includes a controller 31 that controls the scanning unit and an ultrasonic flaw detector 32. The ultrasonic flaw detector 32 includes a monitor showing a measurement result waveform.

  As shown in FIG. 1B, the scanning unit 20 placed at a desired measurement position uses the probe 11 while moving along the inner surface of the steel pipe column 42 as indicated by an arrow A in the figure. And measure the thickness at that point. FIG. 1B also shows a fixing bolt 43 for fixing the guard rail in the cylindrical member.

  As shown in FIG. 2, the scanning unit 20 includes a probe holding unit 29 that holds the probe 11, a scanning motor 23, an encoder 24, a magnet roller 26, and the probe 11 with a steel pipe column 42. And a rotation drive unit 28 that rotates in a direction in contact with the rotation drive unit 28.

  The probe holding unit 29 includes a probe 11 that emits ultrasonic waves, a magnet roller 12 that causes the probe 11 to face the inner circumference of the steel pipe column 42, and ultrasonic inspection of received ultrasonic signals. And a transmission device (transmission means) 13 for transmitting to the device 32. Note that the ultrasonic flaw detector 32 has a built-in memory card, and measurement data is sent via the memory card to a personal computer 33 provided at another location, where data analysis and graphing are performed.

  FIG. 3 is a view showing a state in which the scanning unit 20 is fed into the steel pipe column 42 using the probe feeding jig (positioning means) 50. In addition, the steel pipe column 42 is also shown in FIG. Moreover, the upper end part of the steel pipe column 42 shows the state opened. Referring to FIG. 3, the probe feeding jig 50 is attached to the insertion plate 51, the scanning unit holding unit 52 provided at the distal end of the insertion plate 51, and the insertion plate end opposite to the holding unit 52. And a handle portion 53 provided. The scanning unit 20 is held by the scanning unit holding unit 52, and the user holds the jig 50 with the holding unit 53 and lowers the steel pipe column 42 to a desired height. Note that the probe feeding jig 50 has a size that can pass through the gap between the fixing bolt 43 and the steel pipe column 42 without problems when the scanning unit 20 is held and lowered to a desired height. Measurements can be made without removal, reducing work time. In addition, since the measuring device is downsized, it is possible to measure the thickness of a steel pipe having a small diameter.

  Next, a specific measuring method using the plate thickness measuring apparatus 10 will be described. FIG. 4 is a diagram showing a state in which the plate thickness of the steel pipe column 42 is being measured, and is a cross-sectional view showing a state in which the scanning unit 20 shown in FIG. 1 (B) is located on the inner surface of the steel pipe column 42. . As shown in FIG. 4, the scanning unit 20 that abuts the steel pipe column 42 with a magnet (not shown) holds the probe 11. The probe 11 is an array-type probe, and can measure a certain width w of the steel pipe column 42 at the same time. However, measurement with a single probe is also possible. By scanning the scanning unit 20 in the circumferential direction indicated by the arrow in FIG. 4 and flaw detection of the steel pipe column 42 by the probe 11, the plate thickness of the steel pipe column 42 at a desired position such as the ground can be easily measured. It is.

  FIG. 5 is a schematic diagram showing an outline of the scanning unit 20. FIG. 5A is a perspective view showing an overview of the entire scanning unit 20, and FIG. 5B is a schematic arrow view of a portion indicated by arrows BB in FIG. 5A. Referring to FIG. 5, the entire scanning unit 20 has a probe holder 29 that detachably holds the probe 11 at the center, and has a rectangular parallelepiped shape. When viewed from the short side, the scanning unit 20 includes a rectangular portion and a trapezoidal portion that shares one side of the rectangular portion provided at the lower portion thereof, and an intersection portion between the short side and the oblique side of the trapezoidal portion. A magnet roller 26 is provided as a drive unit. A pair of magnet rollers 26 are provided at both ends of the scanning unit 20 in the longitudinal direction.

  The magnet rollers 26a to 26d are magnetized rollers, and move along the magnetic body by rotating the magnet rollers 26a to 26d while adsorbing to the magnetic body such as the steel pipe column 42. Since the magnet rollers are provided on one side and the other side of the scanning unit 20 in the longitudinal direction, a total of four magnet rollers are provided.

  The rotation axis of the magnet roller is a direction along the longitudinal direction of the traveling device 23, and is thereby movable along the arc in the direction indicated by the arrow BB in FIG.

  As shown in FIG. 5A, the probe holder 21 accommodates a probe holder 29 that holds the probe 11. The probe holding portion 29 has a rectangular parallelepiped shape, and a pair of magnet rollers 12a to 12d are provided at both ends in the longitudinal direction. The rotation axes of the magnet rollers 12a to 12d are in the same direction as the rotation axes of the magnet rollers 26a to 26d of the scanning unit 20. As shown in FIG. 5B, when viewed from the short side of the scanning unit 20, the magnet rollers 12a to 12d of the probe holding unit 29 are sandwiched by the magnet rollers 26a to 26d of the scanning unit 20 and below the magnet rollers 12a to 26d. Accordingly, the magnet rollers 12a to 12d of the probe holding unit 29 and the magnet rollers 26a to 26d of the scanning unit 20 can move on the same arc (that is, the inner peripheral surface of the steel pipe column 42). .

  The probe holder 21 has a rectangular parallelepiped-shaped probe holding portion 29 which can be accommodated by two opposing surfaces in the longitudinal direction, and cylindrical shapes provided at the center of each wall surface 21a. And a protruding portion 21b. The probe holding portion 29 has cylindrical engagement concave portions 14 that are engaged with the protruding portion 21b and rotate in accordance with the rotation of the protruding portion 21b on each of two opposing surfaces in the longitudinal direction. The scanning unit 20 includes a rotation driving unit 28 (see FIG. 2) for rotationally driving the protrusion 21b, whereby the probe holding unit 29 moves the arrow C in FIG. It can be rotated in the direction indicated by.

  That is, the probe 11 is in contact with the steel pipe column 42 around the center in the longitudinal direction of the scanning unit 20 while the scanning unit 20 moves in the circumferential direction along the inner peripheral surface of the steel pipe column 42, or , Can be rotated in the direction of separation.

  As shown in FIG. 5A, magnets 22a and 22b are provided at both ends of the scanning unit 20 in the longitudinal direction. The magnets 22a and 22b are provided on the side where the magnet rollers 26a to 26d are provided. As a result, the scanning unit 20 is more stably held on the inner peripheral surface of the steel pipe column 42.

  Next, details of the scanning unit 20 will be described. 6A is a plan view of the scanning unit 20 (an arrow view of a portion indicated by VIA-VIA in FIG. 6B), and FIG. 6B is a side view thereof (VIB in FIG. 6A). -Arrow view of the part indicated by VIB). Referring to FIG. 6, probe holder 21 having a rectangular shape in a plan view is attached to scanning unit 20 by attachment knobs 28 a to 28 d provided in scanning unit 20. The attachment knobs 28a to 28d hold the probe holder 21 having a rectangular shape at its four corners.

  In addition, a contact medium supply port 27 for supplying a contact medium (water here) necessary for measurement is provided at a substantially central portion of the probe holding unit 29.

  Next, the operation of the plate thickness measuring apparatus 10 according to this embodiment will be described. FIG. 7 is a flowchart showing the operation of the plate thickness measuring apparatus in this embodiment. Referring to FIG. 7, first, preliminary preparation is performed (step S11, hereinafter, steps are omitted). Specifically, for calibrating the probe 11, the scanning unit 20, the ultrasonic flaw detector 32, the probe feeding jig 50, and the plate thickness measuring device, which are members constituting the plate thickness measuring device, Prepare test specimens for adjustment having a predetermined thickness.

  Next, the probe 11 is set on the probe holder 29, and the plate thickness measuring device is calibrated using the adjustment test piece (S12). The probe holder 29 is attached to the scanning unit 20 (S13). The scanning unit 20 holding the probe 11 is sent into the steel pipe column 42 using the probe sending jig 50 (S14). After feeding to a predetermined height, the scanning unit 20 is self-propelled so as to face the inner peripheral surface of the steel pipe column, and thereafter, the measurement of the plate thickness of the steel pipe column 42 is started by moving the scanning unit 20 to a predetermined start position. (S15). When the measurement is completed, the scanning unit 20 is collected (S16). Then, it moves to another steel pipe column to be measured (S17). This is performed for all steel pipe columns. If the measurement is completed for all the steel pipe columns, the post-operation is performed (S18). After the post-operation is completed, the measurement result is analyzed using a personal computer in the office or the like (S19).

  Next, in FIG. 7, the measurement process shown in S15 will be described. FIG. 8 is a flowchart showing the contents of this measurement process. This process is an operation performed by the controller 31 (specifically, the CPU included in the controller) included in the control unit 30.

  Referring to FIG. 8, here, first, the scanning unit 20 is moved from the top of the probe feeding jig 50 along the inner periphery of the steel pipe column 42 (S151). It is determined whether the scanning unit 20 has moved 360 ° within the steel pipe column, that is, whether the scanning unit 20 has made a round within the steel pipe column 42 (S152). If it makes one round (YES in S152), it is determined whether or not appropriate flaw detection data is obtained, and the process is terminated (S153). This is because foreign matter or the like accumulates on the inner peripheral surface of the steel pipe column 42 or paint partially accumulates at the time of painting, and the scanning unit 20 (probe 11) cannot adhere to the inner peripheral surface of the steel pipe column 42. This is because it can happen. If the circuit has not made a round in S152 (NO in S152) or if appropriate flaw detection data has not been obtained in S153 (NO in S153), the process returns to S151 and the scanning unit 20 is moved.

  In the above embodiment, the case where the scanning unit is placed at a desired position by the probe feeding jig has been described. However, the present invention is not limited to this, and the scanning unit is set at the opening at the upper end of the steel pipe column. From there, it may be moved to a desired flaw detection position under the control of the control unit. In this case, it is preferable that the axial direction of the magnet roller is rotatable in an arbitrary direction.

  Further, the plate thickness may be measured not only in the circumferential direction but also in the axial direction by scanning in the axial direction of the steel pipe column.

  In the above embodiment, the magnet roller is provided not only in the scanning unit but also in the probe, but the probe may not be provided with a magnet roller.

  Moreover, in the said embodiment, although the case where the magnet was provided in the scanning part was demonstrated, it does not need to provide not only this but a magnet.

  Further, in the above embodiment, the case where the communication between the probe and the control unit is performed by wire, but the present invention is not limited to this, and may be performed wirelessly.

  Although one embodiment of the present invention has been described with reference to the drawings, the present invention is not limited to the illustrated embodiment. Various modifications can be made to the illustrated embodiment within the same scope or equivalent scope as the present invention.

  In the plate thickness measuring apparatus according to the present invention, since the probe held by the scanning unit moves in the circumferential direction at a predetermined position inside the steel pipe column, measurement of a desired portion of the steel pipe column is easy. It can be advantageously used as a plate thickness measuring apparatus that can be used for

  DESCRIPTION OF SYMBOLS 10 Thickness measuring apparatus, 11 Probe, 12, 26 Magnet roller, 20 Scan part, 21 Probe holder, 22 Magnet, 23 Motor, 24 Encoder, 25 Transmission line, 27 Contact medium supply port, 29 Probe Holding part, 30 control part, 31 controller, 32 ultrasonic flaw detector, 33 personal computer, 41 edge part, 42 steel pipe pillar, 50 probe feeding jig.

Claims (3)

A scanning unit that holds the probe; and a control unit that controls the scanning unit. A plate thickness measuring device for measuring the plate thickness of the steel pipe column using:
Positioning means for positioning the probe held by the scanning unit at a desired position on the inner periphery of the steel pipe column;
When the probe is placed at a desired position by the positioning means, a rectangular parallelepiped moving means that moves the scanning unit along the inner periphery of the steel pipe column;
Transmitting means for transmitting flaw detection data detected by the probe to the control unit,
The probe may have a magnet roller moves while in contact with the inner periphery of the tubular columns,
The moving means includes a probe holder that detachably holds the probe,
The probe holder is a plate thickness measuring device that holds the probe rotatably about an axis that intersects the longitudinal direction of the moving means . The plate thickness measuring apparatus according to claim 1, wherein the moving unit includes a magnet roller that moves the scanning unit while contacting the inner periphery of the steel pipe column. The scanning unit includes a magnet, a plate thickness measuring apparatus according to claim 1 or 2.

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