JPS58208614A - Device for measuring bending of pipe - Google Patents

Abstract

PURPOSE:To measure the bent state of a pipe body readily, by linking two rod members so that they can be freely bent, providing a bent angle detector in one rod member, and detecting relative bending direction of both rod members that are inserted in the pipe body. CONSTITUTION:A bending measuring device 3 is constituted by front and rear guiding pipe 20 and 23 and first and second detecting pipes 21 and 22. The pipes are linked together so that they can be freely bent. A coordinate detector 31, which detects XY coordinates, and a rotary quantity detector 32 are provided in the second detecting pipe 22. When the bending measuring device 3 is inserted in a pipe (not shown) and there is a bent part in the pipe (not shown), difference in relative direction is yielded between the first and second detecting pipes 21 and 22 and detected by the coordinate detector 31. When the bending measuring device 3 is rotated, the rotation is detected by the rotary quantity detector 32. The detected signals are computed and processed by a processing device (not shown), and the result is memorized as the coordinate data. Thus the bent state of the pipe (not shown) can be readily measured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe bending measuring device. In particular, this pipe bending measuring instrument is used in the bi-roof construction method.
Poling f: A method that allows the bending of a buried tube (pipe) etc. to be easily and accurately measured on site, and is provided with bendable first and second rod members.

The pipe roof construction method works by loosening the ground due to tunnel excavation.
This is an excavation method that prevents subsidence of the ground surface as much as possible.Poling is performed in advance along the outer circumference of the excavated tunnel, and steel casing tubes (steel pipes) are buried and supported by shoring. The excavation continues.

Here, as the length of polling increases, especially
It is easy to understand.

In such pipe roof construction methods, construction accuracy is an important factor. In other words, considering that the main reason for adopting the pipe roof construction method is to suppress ground subsidence, it is best to directly support the steel pipes. However, judging from past results, this is difficult. Therefore, the quality of this construction method is determined by checking the condition of the bent hole in the steel pipe with sufficient precision and performing work such as correcting the bent hole. Furthermore, in order to judge the quality of the construction results, it is necessary to accurately measure and evaluate them.

Conventionally, in this type of construction method, there are two ways to measure hole bending in steel pipes: ① Measurement directly with a transit, ② Measurement with an industrial television (camera), etc.
The disadvantage of using a transit system (2) is that it becomes impossible to measure if a single steel pipe bends to a certain extent.On the other hand, when using an industrial television (camera) (2), the accuracy decreases when the pipe is long. In view of this problem, the present invention has been made, and its purpose is to eliminate the drawbacks and problems of the prior art described above.

Special C2: In this invention, the continuous bending of one steel pipe can be measured as a more accurate value even if there is a hole bending that cannot be directly read by transit (2). Even if the amount of bending is large, it can be measured.Furthermore, by using a computer, etc., to process and display the measured values, you can immediately obtain data for correcting the hole bending on site. It means that it is possible.Also,
The measuring device itself can be provided in a small size.

In order to achieve the above object, the present invention has the following configurations as shown in the accompanying drawings and the description of the embodiments thereof.
First and second rod members (first detection tube 21, second detection tube 22) inserted into tube body 1 having a circular cross-sectional shape
and a bending angle detector (coordinate detector 31) built in at least one of the rod members (21/22), the pipe bending measuring device 3 comprising:
21, 22) are bendable (the two are connected, and the second rod member (the first detection tube 21 or the second detection tube 22) is bent relative to the second rod member (the first detection tube 21 or the second detection tube 22). The present invention relates to a pipe bending measuring device that detects a bending direction using the bending angle detector.

With this configuration, by simply inserting the first and second rod members into the tube body, it is possible to move the tube body in the left and right direction.
Vertical bends can be detected.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram illustrating the usage state of a pipe bending measuring device to which the present invention is applied.

In the figure, 1 is a steel pipe buried in the mountain 2. Reference numeral 3 denotes a pipe bending measuring device according to an embodiment of the present invention, which is fixed to the tip side of an insertion rod (conduit pipe) 4. 5 is a processing device with a built-in microcomputer that performs arithmetic processing on the detection signal detected by the pipe bending measuring device 3 and performs coordinate display, printing, recording, etc.
It is connected to a pipe bend measuring device 3 by a cable and a nylon rope line 6. Note that the insertion rod 4 and the pipe bending measuring device 6 are detachable, and the figure shows the state in which they are set.

FIG. 2 is a diagram showing the external configuration of a pipe bending measuring instrument 3 which is an embodiment of the present invention.

The tube bending measuring device 3 includes a tip guide tube 20 and a first detection tube 21.
, the second detection tube 22, and the rear guide tube 23, and around each tube member, guide rollers 24, 25 are provided on the front end side and the rear end side, respectively.
It is provided.

In addition, the tip guide tube 20, the first detection tube 21, the second detection tube 2
2 and the rear guide tube 23 are bently connected internally, and the outer periphery C2 of the connecting portion is provided with a bellows material 26 (for example, bellows rubber) to cover it, and is waterproof. It has a structure.

The rear end of the rear guide tube 26 (: indicates that the nylon lobe 27 is fixed, the cable 28 is pulled out, and the rod 4 is inserted into the insertion 7.
The tips of the two are the same amount.

FIG. 3 is a sectional view showing the opening of the first detection tube 21 and the second detection tube 22.

The $1 detection tube 21 and the second detection tube 22 are based on this invention C.
First of two. This is a specific example of the second rod member. These are connected via a connecting shaft 30, and the second detection tube 22 includes therein a coordinate detector 61 for detecting XY coordinates and a rotation amount detector 32. In addition, the coordinate detector 3
1 is a specific example of a bending angle detector or an instrument for detecting a bending angle according to the present invention.

The connecting shaft 30 has one end connected to the connecting plate 301L at a joint plate 30b, and the other end connected to the coordinate detector 31.
is combined with In addition, here, the coupling plate 30! L is
It is connected to the first detection tube 21 with a bolt. A connecting portion is constituted by these.

The coordinate detector 31 includes an X-axis potentiometer 311L,
It has a Y-axis potentiometer 31b, and is fixed to the inner wall of the second detection tube 22 with a bolt via a coupling plate 31C. Here, the cable 34 is connected to the line 6 (cable), and is connected to the X of the coordinate detector 61.
The signals of the axis and Y-axis potentiometers 3-11L and 31b are taken out.

Note that this cable 34 is a metal fitting 34 fixed to the inner wall of the second detection tube 22! It is held at L.

The rotation amount detector 32 includes a rotation transducer 62 that generates a direction determination signal and a rotation angle signal, and a weight 32k fixed to this shaft. Then, it is fixed to the side wall of the second detection tube 22 with bolts. A cable 65 takes out the signal from this rotary transducer filter 2a and is also connected to the line 6.

FIG. 4 shows this rotary transducer 32a and the weight 32.
It is an explanatory diagram showing the relationship between the weight 32b and the rotary transducer 32! L axis 320ζ2, pol) 3
2(i).The shape of the weight 32b is a flat diamond, and its weight is, for example, about 2 mm.

FIG. 5 is a sectional view of a main part illustrating the connection state between the first detection tube 21 and the front guide tube 20° or the second detection tube 22 and the rear guide tube 26.

The first detection tube 21 and the tip guide tube 2o are connected via a connecting shaft 36. The connecting shaft 36 is
One end thereof is connected to a connecting plate 36a with a nut 36b. Here, the coupling plate 36a is bolted to the tip guide tube 20.

The other end of the connecting shaft 36 is a ball-and-socket joint 36c, which is connected to a connecting plate 36e, and is movable left and right, up and down, and diagonally.

Here, the coupling plate 366 is bolted to the first detection tube 21.

Here, the connecting shaft 36 and the connecting plate 561L.

56e, etc. i: A connecting portion is formed, and such a connecting portion is also present between the second detection tube 22 and the rear guide tube 23.

By configuring the connection part in this way, the $1 detection tube 21. The second detection tube 22 and the like are relatively bendable.

FIG. 6 shows a coordinate detector 6 installed inside the second detection tube 22.
FIG. 6(!L) is a longitudinal section along the tube, and FIG. 6(b) is a longitudinal section perpendicular to the tube.

3D is a connecting shaft shown in FIG. 3, and the other end is equipped with a ball joint 30 (1).
The tightening mechanism is attached by an adjusting plate 61 and is rotatable.

In addition, at the tip of this ball joint 30 (1), there is a detection arm s.
oe is planted. A bearing 62 and an X-axis potentiometer 31!L are attached to the upper and lower parts of the outer housing 60, and a tooth plate 63 is disposed to bridge the space between them. At both ends,
It is fixed to a shaft 64 supported by a bearing 62 and a shaft 65 of the X-axis potentiometer 311L via fixing members 64a and 65a.

As seen in FIG. 6 (bl), a bearing 66 and a Y-axis potentiometer 31b are also provided on the left and right sides of the outer peripheral housing 6o, and similarly, a toothed metal plate 67 is connected to a shaft 68 and a Y-axis potentiometer 31b on both sides. It is fixed to the shaft 69 of the potentiometer 31b via fixing members 681L and 69!L.

Here, the toothed metal plates 63 and 67 can be rotated in the left-right direction and the up-down direction (twice).These toothed metal plates 63.
67 is an elongated opening 661 as shown in FIG. 6(b).
L, 67L, and these openings are 6iS! L,
67&-2 The tips of the detection arms 30e are inserted.

Since the rear end of the detection arm 306 is implanted in the ball of the ball-and-socket joint 30 (1), the detection arm 306 can freely move left and right and up and down in accordance with the rotation of the ball.

FIG. 7 shows the first detection tube 21Φ guide roller 24 as an example of the guide rollers 24 and 25 shown in FIG. The vertical cross-sectional view of measuring device 3 in the direction perpendicular to the tube, $7 diagram (kl), is
FIG.

Four guide rollers 24 are provided around the first detection tube 21 at 90 degree intervals 1'-1.

Each guide roller 24 includes a shaft 24a and a rubber roller 24b. The rubber roller 24b is supported by a support member 24c, which is supported by a port 70.
(through the shirt) 24 a +: It is a structure that can be detachably attached. Furthermore, the shirt 24t is inserted into the fixing member 71 and moves forward and backward. In this structure, as shown in FIG. 7I'b), a fixing member 71 has a cylindrical shape, and a compressed coil spring 7 is inserted into the inner part of the fixing member 71.
2, the head 76 of the shirt 24a is pressed. Note that the fixing member 71 is fixed to the first position by the port 74.
The detection tube 21 is attached around C2 and can be removed. On the other hand, the coil spring 72 is
(Secondly, inside the tube of the fixing member 71 (: inserted and fixed, and similarly removable.

By removing the port 70, the support member 24c can be removed from the jumper 241L, and a rubber roller with a longer support member can be attached.

The configuration of the bending measuring device 3 has been described above, and its operation will be explained next.

As shown in FIG. 1C, when the bend measuring device 3 is inserted into the pipe 1, if the pipe 1 has a bend, the first detection tube 21 and the second detection tube 22 will change their relative directions. are different.

As a result, the skewer arm 306 shown in FIG. 6 is bent and tilted in accordance with the bending direction Z2, and accordingly, the tooth plate 63 moves left and right, and the tooth plate 67 moves up and down. At this point, the X-axis potentiometer 31a and the Y-axis potentiometer 311) rotate according to this amount of movement.

Therefore, an output voltage is generated in the cable 34 according to the amount of rotation of each potentiometer.

This output voltage is a value that indicates the bending direction, and here,
It is separated and taken out in two directions: the X direction and the Y direction. Here, when tilting in either the X direction or the Y direction, only one of the outputs can be obtained.

The outputs of these X-axis and Y-axis potentiometers 31a and 31b have a voltage value of "0" at their center positions.

When moving to the left or up, the voltage value is “positive” and to the right.

In the downward movement, the voltage value becomes "negative". In addition, positive and negative are opposite: two.

The output voltages of the X-axis and Y-axis potentiometers 31L and 31b may be read directly from the portometer C2 and used as the amount of bending, but it is preferable to perform arithmetic processing to be described later and record it as coordinate information.

On the other hand, the distance to the bent position is the distance at which the bending measuring device 3 is inserted (distance to the coordinate detector 31), which is the distance at which the nylon rope 27 is inserted and the distance at which the bending measuring device 6 is inserted. Let the length to the detector 61 be the distance.

In this bending measurement, measurement may be performed at regular distance intervals (two measurements may be performed), or the bending direction and distance may be measured corresponding to a certain degree of bending position.

Measuring at fixed distance intervals is not very suitable when the radius of curvature of the bend is small, but since the bends in this type of pipe are not so small, there is no problem as long as the measurement intervals are not large. The total length of this measuring device B is approximately 2 meters, and the length of each pipe is approximately 50 cm. Therefore, the measurement interval is
For example, every 50σ is adopted.

By the way, since this measuring device 3 is inserted into the tube body 1, it is quite difficult to measure without rotating the measuring device. Therefore, in order to correct the measured value when rotated,
A rotation amount detector 32 is required. This forms part of the bend angle detector if required, but if it can be inserted without rotation, this detector is unnecessary.

A weight fixed to the shaft 32c of the rotation amount detector 32! 2b is always, even if the bending measuring device 3 is rotated.
Vertical direction (-direction. Therefore, the rotation amount detector 32 generates a signal that is the amount (two parts) of the rotation of the bending measuring instrument 6. In this case, when performing arithmetic processing, it is simply a correction value as a digital value. When outputting, a signal indicating the rotation angle and direction is generated using an analog value.In addition, here,
It is designed to output as a digital value.

On the other hand, the tip guide tube 20. First detection tube 21. Second detection tube 22. Guide rollers 24,25 mounted around the rear guide tube 23 allow these to be easily moved. Furthermore, the two compression coils 72+2 split into two symmetrical C branches balance each other, and the tip and rear guide tubes 20.23 degrees first. The centers of the second detection tubes 21 and 22 and the coordinate detector 31 are always located at the center of the tube body 1. In addition, the bending measuring device 3 sequentially measures the insertion rod 4.
You will have to insert it while making additional connections.

FIG. 8 shows a measurement processing device that arithmetic processes the output signal from the bending measuring device 3, displays the coordinates, and sequentially arranges or graphs this and prints it by pulling. An example is shown below.

The measurement processing device 80 is a processing device with a built-in microcomputer shown as 5 in FIG. 1, and includes a measurement section 81 and a computer section 82.

The measuring section 81 first consists of an electric wire resistance correction circuit 86, a scanner 84, and a digital portometer 85.
, Y coordinate analog-to-digital conversion circuit.

In addition, a waveform shaping circuit 86° counter 87a, a counter 8
It has a rotation amount digital value setting circuit consisting of 7b,
Furthermore, it has a distance signal digital value setting circuit consisting of the aforementioned waveform shaping circuit 86 and a distance counter 87c.

The measurement unit 81 receives signals from the X-axis potentiometer 31a and the Y-axis potentiometer 31b at its input terminals 88L and 88b, and converts the signals into digital values. Moreover, the input terminal 880 is connected to the rotary transducer 321L.
The origin signal pulse is input. This is for starting from the reference position at the time of starting measurement. That is, at the set position shown in FIG. 1, an origin signal pulse is generated to set the storage shelf to -0 and the Y coordinate to -0.

Input terminals 88d and 88e respectively receive (+1 direction rotation pulse signals) of the rotation transducer 321L.

(→This is the terminal into which the direction rotation pulse signal is input.

These pulse signals are waveform-shaped, respectively, and the values of counters 871L and 87b are counted up. Here, the actual rotational position of the measuring instrument 3 is obtained by subtracting the value of the counter 87b from the counter 871L.

Instead of using such two counters, one up/down counter may be provided to count up with a signal in the positive direction and count down with a signal in the negative direction.

A signal indicating the distance by which the nylon rope 27 is inserted into the pipe 1 is input to the input terminal 88f. This signal is obtained by rotating the shaft of a rotary transducer built in the lower part of the processing device 5 through the delivery of the nylon rope 27 (two pairs of windows).

If measurements are to be taken every 50 cm, the rotary transducer is shifted by one rotation or one step when the nylon rope 27 is pulled out by 50 cIn. This is accomplished by wrapping the nylon rope 27 once around the rotating drum and delivering it as the drum rotates, causing the rotating drum to engage the shaft of the rotating transducer at a specific rotation ratio.

As described above, when the signal generated from the rotary transducer is input to the terminal 88f, it is waveform-shaped and counts up the distance counter 87C.
Second, use this as a digital voltmeter.

As a result, each time a signal is input to the input terminal 88f, the digital portometer 85 and each counter 871L
, 87k), and 87C are sent to the computer section 82.

On the other hand, the computer section 82 includes an arithmetic processing device 8 2 1
L, CRT display 82b, keyboard 82C,
It is composed of a printer 82 (i) and an auxiliary storage device 826, and based on the signal from the measuring section 81, the output value of the X-axis potentiometer i51a is corrected with respect to the rotation amount of the rotary transducer 622L, and the X-coordinate is Similarly, the output value of the Y-axis potentiometer 31b is corrected for the rotation amount (2), and then calculated as a Y-coordinate value (2) This is sequentially displayed, printed, and recorded. At the same time, at this time, the distance counter 87c
The measured position is calculated from the value of , and is displayed, printed, and recorded in a storage device or the like.

Incidentally, the processing steps of the measurement processing device 80 that performs such processing are shown in FIG. 9 for reference.

Here, since the position of the bend measuring device 6 is measured based on the length of the nylon rope 27 pulled out, the distance of the nylon rope 27 from the measurement processing device 80 (processing device 5) to the entrance of the tube body 1 is measured. The length is calculated in advance, and this is corrected as an offset value before measurement.

As described above in detail, the structure of the bend measuring instrument 3 of the embodiment mentioned here has guide tubes 20 and 23 provided at the front and rear, which are comprised of a first detection tube and a second detection tube. This is provided to protect the detection tube, and is not necessarily necessary. Further, the first detection tube and the second detection tube may be positioned first.

The tip of the tip guide tube 20 is rounded to facilitate insertion. In addition, the objects to be inserted are not limited to pipes such as steel casing tubes of the pipe roof construction method mentioned above, but also various underground pipes such as gas, water pipes, and well frames, and various facility pipes. It can be used to measure bends in lines, etc.Furthermore, the cross section of the tube is not limited to a circular one, but may be rectangular or other shapes.

In this case, the cross-sectional shape of each detection tube may be matched to the cross-sectional shape of the pipe to be measured.

By combining the long and short support members 24c of No. 25, it is possible to match the inner cross-sectional shape of the pipe. In addition, by adopting a guide roller with a long support member 24c for pipes with a large inner diameter, and using a guide roller with a short support member 24c for pipes with a small inner diameter, it is possible to However, due to the relationship with the inner diameter of the tube, it is possible to perform measurements without a guide roller.

The tip and rear guide tubes 20.25 and the first and second detection tubes 21.22 mentioned here are tubular, but they are not limited to tubular shapes, and can be inserted into the inside of the pipe. Any rod-shaped member is sufficient. In particular, a tube-shaped one is used here, and a detector is installed inside.
Not limited to the embodiments, for example, optical sensors such as various electronic circuits may be used and attached externally.

On the other hand, although distances are measured at each measurement point using a nylon rope, a distance meter may be provided inside the first detection tube 21 or the second detection tube 22 to calculate the moving distance. In this case, a two-rotation transducer may be provided, and a roller or the like that engages with this shaft may be run along the pipe side surface ζ2 to measure the distance.

Furthermore, in the previous embodiment, n H in the second detection tube 22
A two-rotation transducer 32 is arranged to calculate the amount of rotation of the measuring instrument and correct it.
If a servo motor is inserted between 1 and 2 m and the detector 31 is rotated according to the output signal of the rotary transducer so that the coordinate detector 31 is always set at the reference position, the correction can be made. It is also possible to obtain each coordinate value without

As described above in detail, in the invention described above, first and second rods are inserted into a tube having a circular or rectangular cross section to measure the bending of the tube. and a bending angle detector provided on at least one of the rod members. The first and second rod members are relatively bendable in the left and right, up and down, and diagonal directions (the two are connected, and the relative Since the bending direction is detected by the angle of focus detector, the bending state of the pipe, etc. can be easily measured by inserting a rod member into the pipe. Measurements can be made even if the curve is large, such as
We can provide small measuring instruments.

Furthermore, by arithmetic processing the output signal of the target angle detector, coordinates indicating the bending angle can be displayed immediately.
Distances between measurement points can also be calculated, and these can be graphed and printed or recorded on a printer, making it easy to obtain data for hole bend correction work on site.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the usage state of a pipe curvature measuring device to which the present invention is applied, and FIG. 3 is a sectional view showing the relationship between the first detection tube and the second detection tube, which are the components of the bend measuring instrument shown in FIG.
An explanation showing the relationship between the rotary transducer and the weight, which are the components of the bend measuring instrument shown in the figure, and FIG. Similarly, FIG. 6 is a sectional view of the main parts explaining the connection state of
FIG. 6) is a partial cross-sectional view of the second detection tube.
a) is a longitudinal cross-sectional view along the tube, FIG. 6 1'b) is
FIG. 3 is a longitudinal section perpendicular to the tube; FIG. 7 is an explanatory diagram of the mounting structure of the guide roller, which is a component of the bending measuring instrument shown in FIG.
is a longitudinal section thereof in the direction perpendicular to the tube, FIG.
FIG. 3 is a longitudinal cross-sectional view along the tube; FIG. 8 is a block diagram of a measurement processing device that performs arithmetic processing on signals from a bending measuring device, and FIG. 9 is an explanatory diagram of processing steps of this measurement processing device. 1... Pipe body, 3... Bend measuring device, 4... Insertion rod, 5
...processing device, 20...tip guide tube, 21...first
Detection tube, 22...Second detection tube, 23...Rear guide tube,
24.25...Guide roller, 31...Coordinate detector, 32...Rotation amount detector, 4 m, +J 5 Prisoner 6 (a) Figure 6 (b) 4b Table 8 Figure

Claims (1)

[Scope of Claims] ;1) An instrument that is inserted into a tube having a circular or rectangular cross section to measure its bending, comprising first and second rods inserted into the tube. and at least one of the members and a bending angle detector, and the first and second rod members are connected so as to be bendable. A pipe bending measuring device, wherein the bending angle detector detects a relative bending direction of the second rod member with respect to the first rod member. (2) The bending angle detector includes an instrument for detecting the bending angle and a rotation amount detector for detecting the amount of rotation of the first or second rod member, and the first or second rod member is tubular. and the detecting instrument and the rotation amount detector,
The pipe bending measuring device according to claim (1), characterized in that the pipe bending measuring device is built in the tubular interior. (3) The device for detecting bend angles includes two potentiometers each detecting a bend in a right angle direction, and the rotation amount detector includes a rotation transducer, and these two potentiometers and rotation A pipe bending measuring device according to claim 2, wherein the output signal of the transducer is subjected to arithmetic processing to obtain coordinate values.