JP2001141431A - Device for measuring bend in embedded pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for measuring a bend in a pipe capable of measuring horizontal and vertical hole bends in an embedded pipe even in the case that there are protrusions in the inner surfaces of the pipe without causing errors in measurement by adjusting the intervals between the protrusions and the length of a pipe to be measured to avoid the protrusions, in the case that a bend in the pipe is large to obstruct a view from the mouth to the tip of the pipe, and in the case that the pipe is filled with fresh water and slurry inside. SOLUTION: This measuring device S is composed of a front vehicle 1, a rear vehicle 2, and a universal joint 31 provided with an intermediate wheel 3 so that the vehicles 1 and 2 are freely bent at their connection part. A laser beam R radiated from a laser beam emitting device 12 on the shaft of the front vehicle 1 in which the edge of the measuring instrument S is brought into contact with the wheel 11 and the intermediate wheel 3 is off the center of a screen 23 inside the rear vehicle 2. By reading the center coordinates of the laser beam R projected onto the screen 23 through the use of a CCD camera 24 provided with an automatic pattern recognizing function, a bend in an embedded pipe P is accurately measured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instrument for measuring the bending of a buried pipe in a freezing method for accurately measuring the horizontal and vertical bending (bending of a hole) of a pipe buried underground, and other methods. It is about.

[0002]

2. Description of the Related Art Generally, in the freezing method, the measurement of the bending of a buried freezing tube or casing tube is indispensable for controlling the state of formation of frozen soil, and high precision is required. Similarly, pipes such as electricity and gas buried diagonally by boring are used for data in ex-post management by measuring their horizontal and vertical bends.

[0003] Conventionally, the detection of bending of a buried pipe has been originally aimed at from the position of a contact point where the wire comes into contact with the inner wall of the pipe when the wire is stretched from the tip of the buried pipe to the mouth and the wire is further extended. There is a so-called wire method of measuring the inclination with respect to the direction and determining the amount of hole bending, but in this method, in the case of a long tube having a tube length exceeding 10 m, not only an error due to the bending of the wire occurs but also When the bending of the pipe becomes large, it becomes impossible to see through to the tip, and the measurement itself may be impossible.

If there is no protrusion on the inner surface of the buried pipe,
Although there is a bending measuring instrument that combines an acceleration sensor and a vibration gyro, it cannot be used when there is a projection on the inner surface of the pipe such as a frozen pipe or casing, so the above wire method is applied. Even with the method, if the pipe length is long, the tip becomes invisible even with a small bend, and a change in the tension of the wire causes a problem in accuracy that a highly accurate measurement result cannot be obtained.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned prior art, the present invention is directed to the horizontal and vertical directions of a frozen pipe or casing buried in a freezing method or a buried pipe buried in an electric or gas work. Even if there is a projection on the inner surface of the tube, the hole bend can be measured without adjusting the spacing between the projections and the length of the measurement tube to escape the projection and cause a measurement error.
It is another object of the present invention to provide a pipe bending measuring instrument that can measure even if the pipe has a large bend and cannot be seen from the mouth to the tip or even if the pipe is filled with fresh water or muddy water.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a method according to the present invention comprises: a front vehicle in which a wheel is mounted on a front portion of a tubular body and a laser light emitting device is mounted inside; A wheel mounted on the rear part of another tubular body, a screen receiving the laser light inside, and a rear wheel equipped with a CCD camera equipped with a pattern automatic recognition function for measuring the position of the light reflected on the screen, and an intermediate wheel. The inside of the pipe body is connected while maintaining the inside of the pipe body in a watertight manner by a universal joint having a joint, and the connected front and rear wheels and the joint are inserted into a pipe to be measured for a hole bend, and are interposed between the laser light emitting device and the front wheel. A laser beam parallel to a line connecting the axes of the wheels is directed toward the screen, and the laser beam received on the screen is measured by a CCD camera. Reduction of the distance is also corrected by calculation, it is characterized in that to detect the bending of the tube located between the preceding vehicle wheels and intermediate wheels.

The screen is attached to an annular tube half filled with liquid, the level of the liquid is visually checked by a camera, the level of the measuring instrument body is detected, and the screen follows the bend but rotates. By correcting the horizontality with the push rod which can be made to be able to be made, the measuring instrument can always be kept horizontal and high accuracy can be maintained.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view schematically showing a state in which a tube is bent by an example of the measuring instrument of the present invention, and FIG.
Is a schematic view schematically showing a state in which the measuring instrument of the present invention of FIG. 1 has advanced leftward for a distance of P1 for measurement, FIG. 3 is a front view of a screen showing the state of FIG. 1, and FIG. 3 is a table illustrating the positional relationship between the position of the vehicle and the wheels of the front vehicle.

In the figure, reference numeral 1 denotes a wheel 11 at the front of one tubular body.
The front car equipped with the laser light emitting device 12 inside, 2
A wheel 21 is attached to the rear of another tube body, and a screen 23 in which a tube 22 formed here in an annular shape is attached to an outer periphery thereof for confirming a horizontal level in which an outer periphery is half filled with a liquid 22a, A car equipped with a small CCD camera 24 equipped with a pattern automatic recognition function for automatically measuring the position of the laser beam reflected on the screen 23 by a computer automatically. 3 is an intermediate wheel provided on a universal joint 31. 3, the front vehicle 1 and the rear vehicle 2
Are connected to form a tube bending measuring instrument S according to an example of the present invention. In the drawing, reference numeral 25 denotes a miniature bulb for illumination for observing the state of the liquid 22a, and T denotes a push rod for pushing the measuring instrument S into the buried pipe P.

[0010] The measuring instrument S of the present invention configured as described above.
Is pushed into the buried pipe P to be bent by a push rod T and inserted to a desired position.
The level of the measuring instrument S itself is confirmed by visually checking the state of the liquid 22a. If the level is not horizontal, the level is adjusted by an external operation so that the level becomes horizontal. The laser light R parallel to 3 is emitted toward the screen 23, and the central coordinates of the light R projected on the screen 23 are automatically measured by the CCD camera 24, thereby correcting the reduction of the distance P1 caused by the bending created in advance. The bending of the pipe P is measured by a possible measuring program.

That is, the measuring device S of the present invention comprises a front vehicle 1 and a rear vehicle 2
And a universal joint 31 provided with an intermediate wheel 3 so that both can freely bend at a connection portion thereof, and a section between the wheel 11 of the front vehicle 1 and the intermediate wheel 3 is measured at a measurement pitch P1.
It measures the bending during this period, and can follow minute bending in both the horizontal and vertical directions of the buried pipe P to be measured. As a result, in the illustrated example, the measuring device S
The laser light R emitted from the laser light emitting device 12 on the axis of the front wheel 1, the tip of which contacts the wheel 11, deviates from the center of the screen 23 inside the rear wheel 2.
By reading the center coordinates of the laser light R shown above using the CCD camera 24 having an automatic pattern recognition function, the bending of the buried pipe P can be measured with high accuracy.

FIG. 3 shows the relationship between the position of the laser beam R on the screen 23 and the degree of bending of the buried tube P. When the laser beam R is located at the center (coordinate origin) of the screen 23, the buried tube P No bend, laser light R is on screen
When it is located on the lower right side (the fourth quadrant) of the coordinates 23, the tip of the buried pipe P is bent to the upper left, and the laser light R
Is located on the upper left side (second quadrant) of the screen 23, indicating that the tip of the buried pipe P is bent to the lower right.

When the bending of the pipe P in one measurement section P1 is measured, the measuring instrument S is further pushed in for the next one section P1 with a push rod and the measurement is repeated, whereby the buried pipe P is measured. The bending from the mouth to the tip can be measured both vertically and horizontally.

[0014]

The present invention is as described above, wherein a wheel is mounted on the front of one tube and a laser light emitting device is mounted inside, and a wheel is mounted on the rear of another tube and mounted inside. CC having a screen for receiving the laser light and an automatic pattern recognition function for measuring the position of the light reflected on the screen
The rear vehicle equipped with the D camera is connected by a universal joint having an intermediate wheel while maintaining the inside of the pipe in a watertight manner, and before and after the connection, the rear vehicle and the joint are placed in a pipe to be measured for hole bending. The laser light emitted from the laser light emitting device is directed toward the screen in parallel with a line connecting the axis of the front wheel and the axis of the intermediate wheel, and the laser light received on the screen is measured by a CCD camera. Since the bend of the pipe located between the wheel and the intermediate wheel is detected, the pipe is bent even if the pipe is too large to see from the mouth to the tip or even if the pipe is filled with fresh water or muddy water. Can be measured, and even if there is a protrusion on the inner surface of the tube, this portion can be removed by a wheel to measure the bending without causing a measurement error.

Further, since the bending of the pipe in each section can be measured with high accuracy, the measuring operation is performed for each section by sequentially leading the sections, so that the vertical and horizontal directions from the mouth to the tip of the pipe can be measured. The bend in the direction can be measured with high accuracy, and therefore, it is extremely useful as a bend measuring device for a pipe buried underground. In particular, in the freezing method, since the occurrence of hole bending exceeding the allowable value causes a partial loss of the formed frozen soil wall, etc., if the high-precision bending measurement according to the present invention becomes possible, such an inconvenience is caused. This makes it possible to prevent the occurrence of a state beforehand, which is useful.

[Brief description of the drawings]

FIG. 1 is a schematic diagram schematically showing a state in which a hole bending of a pipe is measured by a measuring instrument according to an example of the present invention.

FIG. 2 is a schematic diagram schematically showing a state in which the measuring instrument of the present invention in FIG. 1 has advanced leftward by a distance P1 for measurement.

FIG. 3 is a front view of the screen showing the state of FIG. 1;

FIG. 4 is a table showing a positional relationship between a position of a laser beam and wheels of a front vehicle.

[Explanation of symbols]

 Reference Signs List 1 front car 11 wheels 2 rear car 21 wheels 22 tube 22a liquid 23 screen 24 CCD camera with automatic recognition function 25 miniature bulb 3 intermediate wheel 31 universal joint P tube to bend measured R laser beam T push rod

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Koichi Sakami 2-11-16 Kawaraya-cho, Chuo-ku, Osaka-shi, Osaka Inside Seiken Co., Ltd. (72) Inventor Satoshi Yoshida 2, Kawaya-cho, Chuo-ku, Osaka-shi, Osaka No. 11-16, Seken Co., Ltd. F-term (reference) 2D047 AC00 2F065 AA17 AA46 BB08 FF01 FF04 GG04 JJ03 JJ14 JJ26

Claims (4)

[Claims] 1. A front vehicle having wheels mounted on a front portion of one tube body and a laser light emitting device mounted inside, a screen mounted on a rear portion of another tube body and receiving the laser light inside, and a screen for receiving the laser light. A car equipped with a CCD camera equipped with a pattern automatic recognition function for measuring the position of the captured light was connected to a car by holding the inside of the pipe body in a watertight manner by a universal joint having intermediate wheels, and connected. The front and rear wheels and the joint are inserted into the pipe where the bending of the hole is to be measured, and a laser beam is emitted from the laser emitting device toward the screen in a direction parallel to the line connecting the wheels of the front vehicle and the axes of the intermediate wheels. A buried pipe bend measuring device, which measures a laser beam received by a CCD camera to detect a bend of a pipe located between a front wheel and an intermediate wheel. 2. The distance between the front vehicle wheel and the intermediate wheel and the distance between the rear vehicle wheel and the intermediate wheel are equal.
The bending measuring instrument for a buried pipe described in the above. 3. The bending pipe bending measuring instrument according to claim 2, wherein the distance between the front wheel and the intermediate wheel is defined as one measurement section, and the measurement is performed by moving the measuring instrument at the section pitch. 4. The screen is mounted on an annular tube whose outer periphery is half filled with liquid, the level of the liquid is visually recognized by a camera, and the level of the measuring instrument body is detected and corrected. 4. The bending measuring instrument for a buried pipe according to any one of 3 above.