JP2015038431A - Measurement base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and correctly measure an amount of a reduction in thickness of a cylinder structure.SOLUTION: A bottom face of a gauge base 20, fixed with a depth gauge 10, is adhered with gauge base legs 21A, 21B separated at a predetermined interval so as to be parallel to each other. This allows the gauge base 20 to be firmly fixed to a steel pipe cylinder 100, and an amount of reduction in thickness of the steel pipe cylinder 100 can be measured more correctly. Further, with the depth gauge 10 fixed to an end of the gauge base 20, an amount of reduction in thickness of a near-ground portion of the steel pipe cylinder 100 can be measured. The gauge base 20 includes a projection part 20A which is projected from the gauge base legs 21A, 21B and has a measuring groove 22 for measuring an amount of reduction in thickness in the projection part 20A. Thus, an amount of reduction in thickness of a thickness-reduced part 110 can be measured by installing the gauge base legs 21A, 21B on a sound part of the steel pipe cylinder 100.

Description

  The present invention relates to a technique for measuring a thinning amount of a steel material of a cylindrical structure.

  Electric poles are widely used as equipment for supporting communication cables, power cables, etc., and are roughly classified into two types: concrete pillars made of concrete and reinforcing bars, and steel pipe pillars made of carbon steel. The latter steel pipe column is generally protected by hot dip galvanization or the like, but corrosion in the air is inevitable.

  From the knowledge so far, corrosion accompanied by thinning of the steel pipe column is often generated particularly near the ground. There is an example in which thinning due to corrosion near the ground has progressed, leading to a collapse accident (see Non-Patent Document 1). In order to prevent the collapse of the steel pipe column, it is necessary to check the thinning of the steel material of the steel pipe column and replace the one with reduced strength as a structure.

“Moriguchi City Pole Collapse Causes and Preventive Measures” [online], July 16, 2009, Kansai Electric Power Co., Inc. [Search June 24, 2013], Internet <URL: http: / /www1.kepco.co.jp/pressre/2009/0716-1j.html>

  As a method of measuring the thinning of a cylindrical structure such as a steel pipe column, two methods are conceivable: a measurement method using a commercially available depth gauge and a measurement using an ultrasonic thickness gauge.

  Depth gauge is intended to measure the depth from a flat surface with reference to a flat surface. Therefore, it is difficult to take a reference surface on the side of a cylindrical structure such as a steel pipe column. There is a problem that cannot be implemented. Further, when the measurement location is paved near the ground with asphalt or the like, there is a problem that the depth gauge cannot be used because the reference surface on one side cannot be taken. Furthermore, even if the rust at the location where the thinning is measured is completely removed, there is also a problem that the thinning measurement cannot be performed accurately without taking out the reference plane correctly because of the unevenness on the surface.

  On the other hand, the method of measuring using an ultrasonic thickness gauge has a problem that the degree of rust removal on the surface greatly affects the measurement result, and even if rust is completely removed, an error occurs due to surface irregularities.

  This invention is made | formed in view of the above, and aims at measuring the thinning amount of a cylindrical structure simply and accurately.

  A measuring table according to the present invention is a measuring table for measuring a thinning amount of a cylindrical structure by placing a depth gauge, and a plate provided with a through hole into which a gauge gauge probe can be inserted in a plane on which the depth gauge is arranged. And a pair of gauge base legs that are arranged on a surface opposite to the plane so as to be spaced apart from each other at a predetermined interval and in parallel with each other, and are installed in close contact with the cylindrical surface. And

  In the measuring table, the gauge table has a protruding portion that protrudes from the gauge table leg, and the through hole is formed in the protruding portion.

  In the measurement table, the gauge table includes at least one through hole in a direction parallel to the gauge table leg.

  According to the present invention, the gauge base can be firmly fixed to the side surface of the cylindrical structure by providing the gauge base with a pair of gauge base legs that are spaced apart and arranged in parallel. Can be measured easily and accurately.

It is a perspective view which shows the structure of the measuring device in 1st Embodiment. It is the figure which looked at a mode that the measuring instrument was installed in the steel pipe pillar from the A side of FIG. It is a figure which shows a mode that the thinning amount of a steel pipe column is measured. It is a perspective view which shows the structure of the measuring device in 2nd Embodiment. It is a figure which shows a mode that the thinning amount of a steel pipe column is measured using the measuring device in 2nd Embodiment.

[First Embodiment]
FIG. 1 is a perspective view showing a configuration of a measuring instrument according to the first embodiment. FIG. 2 is a view of a state in which a measuring instrument is installed on a cylindrical steel pipe column as viewed from the A side in FIG. 1.

  The measuring instrument 1 in the first embodiment includes a depth gauge 10, a gauge base 20, and gauge base legs 21A and 21B.

  The gauge base 20 is a rectangular thick plate, and the gauge base legs 21A and 21B are attached to one surface (hereinafter referred to as “bottom surface”), and the depth gauge 10 is attached to the other surface (hereinafter referred to as “top surface”). .

  The gauge base legs 21A and 21B are affixed along the long sides of the bottom surface of the gauge base 20 so as to be spaced apart from each other at a predetermined interval and parallel to each other. The gauge bases 21A and 21B have a triangular prism shape, and the length of the gauge bases 21A and 21B (the height of the triangular prism) is the same as the length of the long side of the gauge base 20. The distance between the gauge bases 21A and 21B is determined according to the thickness of the steel pipe column 100 to be measured. The lengths of the gauge bases 21 </ b> A and 21 </ b> B do not have to be the same as the length of the long side of the gauge base 20 as long as they are stable when the gauge base 20 is installed on the steel pipe column 100. Further, the interval between the gauge bases 21 </ b> A and 21 </ b> B may be adjustable according to the thickness of the steel pipe column 100.

  The depth gauge 10 includes a display unit 11 for displaying a measurement result, a ZERO button 12 for adjusting the zero point, and a main scale 13 that is disposed through the depth gauge 10 in a movable state with respect to the depth gauge 10 main body. The tip of the is a measuring element 14 to be brought into contact with the measurement surface. The distance to which the main scale 13 is moved is displayed on the display unit 11. A depth gauge 10 that can measure the moving distance of the main scale 13 in units of 0.1 mm is used.

  The depth gauge 10 is attached to the upper end of the gauge table 20. A through hole (not shown) for inserting the probe 14 is formed in the gauge base 20. The depth gauge 10 is attached so that the measuring element 14 is exposed from the bottom surface of the gauge base 20 and can move vertically with respect to the bottom surface, and can measure the distance in the vertical direction of the bottom surface.

  As shown in FIG. 2, at the time of measurement, the gauge bases 21 </ b> A and 21 </ b> B are installed in close contact along the longitudinal direction of the columnar steel pipe column 100. Thereby, the measuring instrument 1 is firmly fixed to the steel pipe column 100. In this state, the distance to the steel pipe column 100 can be measured by pressing the probe 14 of the depth gauge 10 against the steel pipe column 100. By comparing the distance to the steel pipe column 100 between the healthy part of the steel pipe column 100 and the reduced thickness part 110 of the steel pipe column 100, the thickness reduction amount of the reduced thickness part 110 can be measured.

  Next, a procedure for measuring the thinning amount of the steel pipe column using the measuring instrument in the first embodiment will be described.

  FIG. 3 is a diagram illustrating a state in which the thickness reduction of the steel pipe column 100 is measured.

  First, the measuring instrument 1 is installed with the gauge bases 21 </ b> A and 21 </ b> B in close contact with the sound part (the part without thickness loss) of the steel pipe column 100.

  The measuring scale 14 exposed from the bottom surface of the gauge base 20 is pressed against the steel pipe column 100 by moving the main scale 13 of the depth gauge 10, and the ZERO button 12 is pressed to adjust the zero point.

  Subsequently, the gauge bases 21 </ b> A and 21 </ b> B are placed in close contact with each other at the position where the thinned portion 110 of the steel pipe column 100 can be measured.

  The main scale 13 of the depth gauge 10 is moved to press the measuring element 14 against the thinning portion 110, and the numerical value displayed on the display portion 11 is read to measure the thinning amount.

  In the above description, the case of measuring the amount of thinning of the thinned portion 110 of the steel pipe column 100 has been described as an example. However, the size of the dent of the cylindrical structure can be measured by the same method. Moreover, the columnar structure to be measured is not limited to the steel pipe column, and can also be used for measuring the thinning amount of the columnar structure such as an illumination column or a signal column.

  As described above, according to the present embodiment, by attaching the gauge base legs 21A and 21B to the bottom surface of the gauge base 20 to which the depth gauge 10 is attached so as to be spaced apart from each other at a predetermined interval and parallel to each other, Since the gauge base 20 can be firmly fixed to the cylindrical steel pipe column 100, the thickness reduction of the steel pipe column 100 can be measured more accurately.

  According to the present embodiment, by attaching the depth gauge 10 to the end of the gauge base 20, it is possible to measure the thinning amount in the vicinity of the ground of the steel pipe column 100.

  The depth gauge 10 may be removable from the gauge table 20 or may be fixed to the gauge table 20.

  Moreover, although the shape of the gauge bases 21A and 21B is a triangular prism, the gauge bases 21A and 21B are not limited to this as long as the gauge bases 21A and 21B can be brought into close contact with the steel pipe column 100.

[Second Embodiment]
In the measuring instrument of the first embodiment, when the place where the measuring instrument is installed is lifted up by rust etc., the gauge base cannot be brought into close contact with the steel pipe column, and the amount of thinning is measured accurately. I can't. Moreover, in the measuring instrument of 1st Embodiment, when measuring a thinning amount, it is necessary to fix a measuring instrument to a steel pipe pillar, and a measurement error may become large. Therefore, in the second embodiment, a measuring device that can fix the measuring device at a position away from the thinning portion and can perform zero-point adjustment and measurement of the thinning amount with the measuring device fixed is shown.

  FIG. 4 is a perspective view showing the configuration of the measuring instrument in the second embodiment.

  The measuring instrument 1 in the second embodiment includes a depth gauge 10 attached to a support base 15, a gauge base 20, and gauge base legs 21A and 21B. The measuring instrument 1 according to the second embodiment is different from the first embodiment in that the gauge base 20 is longer than the gauge base legs 21A and 21B and includes measurement grooves 22 that can be measured at a plurality of positions on the gauge base 20. Different from the measuring instrument 1 in the form.

  The depth gauge 10 is fixed to a support base 15 having a flat bottom surface. When the depth gauge 10 is placed on the gauge table 20, the bottom surface of the support table 15 and the upper surface of the gauge table 20 are brought into close contact with each other. Thereby, the measurement direction of the depth gauge 10 can be made perpendicular to the bottom surface of the gauge base 20 more reliably.

  The gauge base legs 21A and 21B are affixed along the long sides of the bottom surface of the gauge base 20 so as to be spaced apart from each other at a predetermined interval and parallel to each other. The lengths of the gauge bases 21A and 21B are shorter than the length of the long side of the gauge base 20, and are attached to one short side of the bottom surface of the gauge base 20. The gauge base 20 has a protruding portion 20A that protrudes from the gauge base legs 21A and 21B. In the present embodiment, the length of the protruding portion 20A is substantially the same as the length of the gauge bases 21A and 21B. Here, the lengths of the gauge bases 21A and 21B and the protruding part 20A of the gauge base are substantially the same, but differ if the length is sufficient to be stable when the gauge base 20 is installed on the steel pipe column 100. Also good.

  A measuring groove 22 for inserting the probe 14 of the depth gauge 10 is formed in the protruding portion 20A of the gauge base 20 in parallel with the gauge base legs 21A and 21B. By simply changing the position at which the probe 14 is inserted into the measurement groove 22, that is, the position at which the depth gauge 10 is disposed, measurement at a plurality of locations can be performed while the gauge base 20 is fixed to the steel pipe column 100. Specifically, the zero point adjustment is performed at the position inside the gauge base 20 of the measurement groove 22 indicated by reference numeral 22A, and the thickness reduction is measured at the end position of the gauge base 20 of the measurement groove 22 indicated by reference numeral 22B. To do. In the present embodiment, the measurement groove 22 for performing the zero point adjustment and the measurement of the thinning amount is provided. However, the through hole for performing the zero point adjustment and the through hole for performing the measurement of the thinning amount are respectively provided. It may be provided separately. Further, the measurement groove 22 may be formed not only from the protruding portion 20A but also from the protruding portion 20A to a position corresponding to between the gauge bases 21A and 21B.

  In addition, two confirmation holes 23 are formed at positions on the extension line of the measurement groove 22 of the gauge base 20. The confirmation hole 23 is used to confirm whether or not the gauge table 20 is installed in parallel to the steel pipe column 100.

  The gauge table 20 is made of, for example, acrylic, and has a thickness that does not bend even when the depth gauge 10 is arranged and measured at the end of the protruding portion 20A.

  Next, a procedure for measuring the thinning amount of the steel pipe column using the measuring instrument in the second embodiment will be described.

  FIG. 5 is a diagram showing a state in which the amount of thinning of the steel pipe column is measured using the measuring instrument in the second embodiment.

  First, the measuring instrument 1 is arranged so that the gauge bases 21 </ b> A and 21 </ b> B are in close contact with the sound part of the steel pipe pillar 100, and the measuring instrument 1 is fixed to the steel pipe pillar 100 with the rubber band 30. At this time, the measuring instrument 1 is arranged in the steel pipe column 100 so that the position of the measurement groove 22 indicated by reference numeral 22A is a healthy part of the steel pipe column 100 and the position of the measurement groove 22 indicated by reference numeral 22B is the thinned part 110. . In addition, if a magnet is attached between the gauge base legs 21A and 21B on the bottom surface of the gauge base 20, the magnet is attracted to the steel pipe column 100, so that the gauge base 20 can be firmly fixed in parallel to the steel pipe column 100. It becomes possible.

  And the depth gauge 10 is arrange | positioned in the position shown with the code | symbol 22A, the measuring scale 14 exposed from the measurement groove | channel 22 is moved to the steel pipe pillar 100 by moving the main scale 13 of the depth gauge 10, and the ZERO button 12 is pushed and zero adjustment is carried out. .

  Subsequently, the depth gauge 10 is arranged at the position of the confirmation hole 23, the main scale 13 of the depth gauge 10 is moved, the measuring element 14 exposed from the confirmation hole 23 is pressed against the steel pipe column 100, and the numerical value displayed on the display unit 11 is displayed. read. When the read numerical value is within 0 ± 0.1 mm, it is assumed that the gauge base 20 is installed in parallel to the steel pipe column 100. Any one of the two confirmation holes 23 may be used.

  Then, the depth gauge 10 is disposed at the position indicated by reference numeral 22B, the main scale 13 of the depth gauge 10 is moved, the measuring element 14 exposed from the measurement groove 22 is pressed against the thinned portion 110, and the numerical value displayed on the display portion 11 Read the thinning amount.

  As described above, according to the present embodiment, the gauge base 20 includes the protrusion 20A protruding from the gauge base legs 21A and 21B, and the measurement groove 22 for measuring the thinning amount is provided in the protrusion 20A. By providing, it becomes possible to install the gauge bases 21 </ b> A and 21 </ b> B in the sound portion of the steel pipe column 100 and measure the amount of thinning of the thinned portion 110.

  According to the present embodiment, since the gauge base 20 includes the measurement grooves 22 that can be measured at a plurality of locations, the zero point adjustment and the measurement of the thickness reduction can be performed while the gauge base 20 is fixed. .

DESCRIPTION OF SYMBOLS 1 ... Measuring device 10 ... Depth gauge 11 ... Display part 12 ... ZERO button 13 ... Main scale 14 ... Measuring element 15 ... Supporting base 20 ... Gauge base 20A ... Protruding part 21A, 21B ... Gauge base 22 ... Measuring groove 23 ... Confirmation hole 30 ... Rubber band 100 ... Steel pipe pillar 110 ... Thinning part

Claims (3)

A measuring table for measuring a thinning amount of a cylindrical structure with a depth gauge,
A plate-like gauge base having a through hole into which a gauge gauge probe can be inserted in the plane on which the depth gauge is arranged;
A pair of gauge bases disposed on the surface facing the flat surface so as to be spaced apart from each other at a predetermined interval and in parallel with each other;
A measuring table characterized by comprising: The gauge base has a protruding portion that protrudes from the gauge base leg,
The measuring table according to claim 1, wherein the through hole is formed in the protruding portion.   The measurement table according to claim 1, wherein the gauge table includes at least one through hole in a direction parallel to the gauge table leg.

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