JPH08184425A - Apparatus for measuring thickness of piping - Google Patents

Abstract

PURPOSE: To measure the thickness of piping very easily and accurately. CONSTITUTION: The apparatus for measuring the thickness of piping comprises a clamp 5 disposed around piping 1, a plurality of struts 6 arranged radially on the inside of the clamp 5 while abutting against the surface of the piping 1 in order to secure the clamp 5 around the piping 1, a probe sensor 7 touching the surface of the piping 1, and a probe holder 9 fixed to the inside of the clamp 5 in order to hold the probe sensor 7 while pressing against the surface of the piping 1 and moving in the circumferential direction along with the probe sensor 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe wall thickness measuring device mainly used for diagnosing deterioration of pipes installed in buildings such as office buildings for water supply and drainage or for air conditioning equipment. .

[0002]

2. Description of the Related Art As a method for diagnosing the deterioration state of piping installed in buildings such as office buildings for water supply and drainage or for air conditioning equipment, a method of measuring the wall thickness of the piping using an ultrasonic thickness gauge It has been known.

FIG. 3 shows an example of a conventional method of measuring the wall thickness of a pipe using an ultrasonic thickness gauge. In the figure, reference numeral 1 is the pipe to be measured, and 2 is the meat of the pipe 1. An ultrasonic thickness gauge main body for measuring the thickness, and a reference numeral 3 is a probe sensor which is connected to the adjusted thickness gauge main body 2 via a measurement cord 4 and is pressed against the surface of the pipe 1. .

To measure the wall thickness of the pipe 1 with such a structure, first, the measuring points (16 measuring points) are marked on the surface of the pipe 1 at equal intervals in the circumferential direction by a compact or the like. Plot while adding. Next, the ultrasonic measurement thickness gauge main body 2 is activated, and the probe sensor 3 is pressed against the measurement point of the pipe 1 with a finger. Then, the ultrasonic wave emitted from the probe sensor 3 is reflected on the inner surface of the pipe 1 and the remaining wall thickness of the pipe 1 at the measurement point is measured depending on the length of time it returns to the probe sensor 3 again. It is a thing.

[0005]

The conventional method for measuring the wall thickness of the pipe is configured as described above, and since the probe sensor 3 is pressed against the measurement point of the pipe 1 with a finger for measurement, The measurement data varies due to the force of the fingertip and the contact angle of the probe sensor 3, and
There was a problem that the thickness of the In addition, when measuring, it is necessary to mark the measurement points in advance, which causes a problem that extra work is required.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a pipe wall thickness measuring device capable of easily and accurately measuring the deterioration state of a pipe. .

[0007]

According to a first aspect of the present invention, there is provided a thickness measuring device for a pipe, wherein a clamp installed around the pipe and a surface radially inside the clamp and on the surface of the pipe. A plurality of fixed struts that project so as to abut against the pipe, fix the clamp around the pipe, a probe sensor that is pressed against the surface of the pipe, and a probe sensor that is attached inside the clamp. And a probe holder that holds the probe sensor in a state of being pressed against the surface of the pipe and that moves the probe sensor in the circumferential direction of the pipe.

A pipe wall thickness measuring device according to a second aspect of the present invention is the pipe wall thickness measuring device according to the first aspect, wherein the pipe wall thickness measuring device is attached to the probe holder inside the clamp. A traveling rail on which the traveling roller travels is provided along the circumferential direction of the clamp, and while the traveling rail measures the wall thickness of the pipe, the traveling roller engages with the probe holder. A plurality of stop recesses for positioning are provided on the traveling rail at predetermined intervals.

[0009]

In the pipe wall thickness measuring device according to the first aspect of the present invention, the probe sensor is held by the probe holder while being pressed against the surface of the pipe at a constant pressure,
Moreover, the probe sensor moves in the circumferential direction of the pipe together with the probe holder, so that the wall thicknesses at a plurality of positions of the pipe are measured.

In the pipe wall thickness measuring device according to the second aspect of the present invention, while the wall thickness of the pipe is being measured by the probe sensor, the traveling roller is engaged with the recessed portion for stopping the probe. A probe holder that holds the child sensor is positioned.

[0011]

1 and 2 show an embodiment of a pipe wall thickness measuring apparatus according to the present invention. In the drawings, the same parts as those of the conventional example are designated by the same reference numerals, and the description thereof will be omitted. In the figure, reference numeral 5 is a circular ring-shaped clamp, which is installed around the pipe 1, and 6 is radially projected inside the clamp 5, and the clamp 5 is provided around the pipe 1 and the pipe 1
The fixed column, which is fixed during the measurement of the wall thickness of the pipe, is connected to the wall thickness meter main body (not shown) of the pipe via the connection cord 8 and is pressed against the surface of the pipe 1 to A probe sensor 9 for measuring the thickness, 9 is installed inside the clamp 5, holds the probe sensor 7 pressed against the surface of the pipe 1, and holds the probe sensor 7 along with the circumference of the pipe 1. A probe holder that moves in the same direction, and the reference numeral 10 is continuously projecting inside the clamp 5 in the circumferential direction thereof, and the probe holder 9 together with the probe sensor 7 surrounds the circumference of the pipe 1. It is a traveling rail that travels in the direction.

The clamp 5 is provided with two arcuate bodies 5a, 5a formed in a circular arc shape by a metal plate or a synthetic resin plate, and attached to one end of the arcuate bodies 5a, 5a.
a and 5a, a connecting pin 5b for rotatably connecting one end,
It is attached to the other ends of the arc bodies 5a, 5a,
The other end of 5a is provided with a lock hook 5c for connecting the other end so as to be easily connected and disconnected.

The fixed support column 6 is provided with an outer tube 6a projecting from the inside of the arcuate body 5a, and a distal end of the outer tube 6a slidably inserted in the radial direction of the clamp 5 so that the front end of the outer tube 6a is on the surface of the pipe 1. The inner pipe 6b which abuts and the inner pipe 6a
and a coil spring 6c pressing the tip portion of b to the surface of the pipe 1. The outer tube 6a is detachably attached to the arc body 5a by a fixing nut 11. Further, the fixed column 6 is provided with the outer pipe 6a and the inner pipe 6b so as to be expandable and contractible so that the fixed column 6 can be freely adapted to the pipes 1 having different outer diameters.

The probe holder 9 is supported on the traveling rail 10 via traveling rollers 12 traveling on the traveling rail 10, and an outer frame 9a that moves in the circumferential direction of the pipe 1 and inside the outer frame 9a. An inner frame 9b installed movably in the radial direction of the pipe 1, a coil spring 9c interposed between the outer frame 9a and the inner frame 9b, and pressing the inner frame 9b toward the pipe 1; 9b, a probe column 9d protruding from both sides of the probe column 9b and having a traveling roller 13 traveling on the surface of the pipe 1 attached to the tip of the probe column 9d. A probe storage frame 9e in which the child sensor 7 is stored,
A holding rod 9 which is attached to each rear portion of the probe sensor 7 and holds the probe sensor 7 in the probe storage frame 9e.
f and a coil spring 9g that presses the probe sensor 7 against the surface of the pipe 1.

The inner frame 9b and the probe column 9d are fixed to the outer frame 9a by an adjusting screw 14 composed of a thumbscrew. By loosening the adjusting screw 14, the probe column 9d projects according to the outer diameter of the pipe 1. The length can be freely adjusted.

The holding rod 9f is fixed to a horizontal rod 9h projecting from the probe column 9d by an adjusting screw 15, and by loosening the adjusting screw 15, the holding rod 9f projects according to the outer diameter of the pipe 1. By changing the length, the amount of protrusion of the probe sensor 7 from the probe storage frame 9e can be adjusted.

As described above, since the projecting length of the probe column 9d and the projecting amount of the probe sensor 7 from the probe housing frame 9e can be adjusted, the probe sensor 7 is provided. Has an effect that the pressing force for pressing the surface of the pipe 1 can be kept constant.

The running rail 10 is formed with a stopping recess 10a for engaging and stopping the running roller 12 running on the running rail 10. While the probe sensor 7 measures the wall thickness of the pipe 1, the running rail 10 runs. The roller 12 is provided with a recess 10a for stopping.
By engaging with, the movement of the probe holder 9 can be suppressed and the wall thickness of the pipe 1 can be accurately measured.

The stop recesses 10a are formed at predetermined intervals in the circumferential direction of the pipe 1, and are usually formed by the number (about 16) of measurement points of the pipe 1.

Next, a method for measuring the wall thickness of the pipe 1 with the pipe wall thickness measuring apparatus according to the present invention having the above-mentioned structure will be described. First, connect the wall thickness measuring device to piping 1
And the degree of contact and the contact angle of the probe sensor 7 with respect to the surface of the pipe 1 are adjusted at the same time. This adjustment is performed by loosening the adjusting screw 14 fixing the inner frame 9b and the probe column 9d to the outer frame 9a, adjusting the protruding length of the probe column 9d, and holding the rod 9f by the horizontal bar 9h. This is done by loosening the adjusting screw 15 which is fixed to, changing the protruding length of the holding rod 9f, and further adjusting the protruding amount of the probe sensor 7 from the probe housing frame 9e. In this case, the force with which the probe sensor 7 presses the surface of the pipe 1 is adjusted to be the same as the force with which the fingertip presses it.

Next, the probe holder 9 is moved along the circumferential direction of the pipe 1 to the first stop recess 10a. next,
The roller holder 12 is engaged with the first stop recess 10a to fix the probe holder 9 at one point around the pipe 1. Next, the ultrasonic thickness gauge (not shown) is operated to measure the wall thickness of the first measurement point of the pipe 1.

When the measurement of the first measurement point is completed, the roller 12 is removed from the first stop recess 10a, the probe holder 9 is moved to the next stop recess 10a, and the roller 12 is moved to the stop recess 10a. Are again engaged to fix the probe holder 9, and the wall thickness at the next measurement point of the pipe 1 is measured. Thereafter, similarly, while moving the probe holder 9 in the circumferential direction of the pipe 1, the probe sensor 7 sequentially measures the wall thickness of the pipe 1.

By providing a plurality of sets of fixed columns 6 having different lengths and probe holders 9 having different lengths of the probe columns 9d, it is possible to reduce the wall thickness of a wide range of pipes having different diameters. It becomes possible to measure with a single device.

[0024]

The pipe wall thickness measuring device according to the first aspect of the present invention, which has the above-described structure, has a clamp installed around the pipe and a radial inside of the clamp. Projected so as to contact the surface of the pipe,
A plurality of fixed struts for fixing the clamp around the pipe, a probe sensor pressed against the surface of the pipe, and provided inside the clamp, the probe sensor on the surface of the pipe. Since it is provided with a probe holder that is held in the pressed state and that moves in the circumferential direction of the pipe together with the probe sensor, there is no variation in the measurement results and the wall thickness of the pipe is extremely accurate. And, there is an effect that it can be easily measured.

A pipe wall thickness measuring device according to a second aspect of the present invention is the pipe wall thickness measuring device according to the preceding paragraph.
Inside the clamp, a traveling rail on which the traveling roller attached to the probe holder travels is provided along the circumferential direction of the clamp, and on the traveling rail, while measuring the wall thickness of the pipe, Since the traveling rail is provided with a plurality of recesses for stopping the positioning of the probe holder by engagement of the traveling rollers, movement of the probe sensor can be prevented while measuring the wall thickness of the pipe. As compared with the measurement of the wall thickness of the pipe according to claim 1, there is an effect that the wall thickness of the pipe can be measured more accurately. Further, since it is not necessary to plot the measurement points in advance, the time required for the measurement can be short, and the measurement work can be performed in a short time.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a pipe wall thickness measuring device according to an embodiment of the present invention showing its usage, taken along the radial direction of the pipe.

FIG. 2 is a cross-sectional view taken along the axial direction of the pipe shown in FIG.

FIG. 3 is a diagram showing a conventional example of a method for measuring the wall thickness of a pipe.

[Explanation of symbols]

1 piping, 5 clamps, 6 fixed columns, 7 probe sensor, 9 probe holder, 10 running rail, 10a
Stop recess.

Claims (2)

[Claims] 1. A pipe wall thickness measuring device for measuring the wall thickness of a pipe by an ultrasonic thickness gauge, wherein a clamp installed around the pipe and a surface of the pipe radially inside the clamp. A plurality of fixed struts that project so as to abut against the pipe, fix the clamp around the pipe, a probe sensor that is pressed against the surface of the pipe, and a probe sensor that is attached inside the clamp. A pipe holding a probe sensor in a state of being pressed against the surface of the pipe, and a probe holder that moves in the circumferential direction of the pipe together with the probe sensor. Wall thickness measuring device. 2. A traveling rail on which a traveling roller attached to a probe holder travels is provided inside the clamp along the circumferential direction of the clamp, and the traveling rail includes:
During the measurement of the wall thickness of the pipe, a plurality of stop recesses for engaging the traveling roller to position the probe holder are provided in the traveling rail at predetermined intervals. The pipe wall thickness measuring device according to claim 1.