JPH0535802B2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> This invention relates to a hole bending measuring device, and in particular to a hole bending measuring device for measuring the degree of bending of small-diameter excavated holes such as boreholes and advanced guide holes that cannot be accessed by humans. Concerning a measuring device.

≪Conventional technology≫ A hole drilled using a boring machine or the like is usually
They do not have perfect straightness and are curved in either direction, and horizontal boreholes in particular tend to slope downward due to the force of gravity acting on the boring machine.

Incidentally, in the case of comparatively small-diameter excavated holes such as advanced guide holes in oil fields, wells, and tunnels, for example, in advanced guide holes, the bending of the guide hole must be measured in order to accurately determine the positional relationship with the main shaft.

For this reason, in order to measure the degree of curvature of such small-diameter excavated holes such as boreholes and advanced guide holes that cannot be accessed by humans, conventional methods have been to use two cylindrical bodies containing, for example, a laser oscillator and a television camera. Measurement using a measurement tube connected by a flexible member, inserted into a borehole, and detecting the difference in inclination angle between the front and rear cylinders of the flexible member using a laser beam and a television camera. equipment was used.

This type of measuring device takes measurements while sequentially moving inside the borehole, but the movement is done in an inchworm-like manner so that the optical axis from the previous measurement becomes the reference optical axis for the next measurement. Ta.

<<Problems to be Solved by the Invention>> With the above-mentioned type of measuring device, unless the initial settings of the measuring device are accurately determined at the transmitting position in the borehole, large errors will be accumulated in subsequent measurements. However, there was a lack of consideration regarding this initial setting.

In other words, with this type of measuring device, bending is measured using the cylinder at the rear of the hole as a reference, and in the initial settings of the measuring device, the rear cylinder is used as a reference, and this determines the bending in the hole to be measured. Even if it is set to , the relative hole curvature is measured because measurements are repeated sequentially based on that state.

Additionally, if the laser oscillator and television camera are incorrectly attached to the barrel, this cannot be confirmed from the outside, so the device itself will contain errors, and measurement accuracy may be affected in this respect as well. It was lowering it.

This invention was made in view of these problems, and its purpose is to measure the degree of curvature of small-diameter excavated holes such as boreholes and advanced guide holes that cannot be accessed by humans. It is an object of the present invention to provide a hole curvature measuring device which can measure hole curvature with high precision without producing cumulative errors.

<<Means for Solving the Problems>> In order to achieve the above object, the hole bending measuring device of the present invention is inserted into a small diameter excavation hole such as a borehole or an advanced guide hole that cannot be accessed by humans.
A measuring tube that moves along this axis is rotatably connected to one end of a pair of leading and trailing cylinders, a light receiver built in the leading cylinder, and a measuring tube built in the trailing cylinder. It has a laser emitting device that projects light in the front-rear direction on the same optical axis, and a light receiving device installed at the mouth of the excavation hole, and the laser beam is projected to the light receiver in front of the leading cylinder and measured. The method is characterized in that the deflection of the hole is measured while comparing the deflection with the deflection of the trailing cylinder at the same position, which is measured by projecting a laser onto the light receiving device at the rear. .

<<Operation>> In the hole bending measuring device having the above configuration, a laser beam is projected in the front-rear direction on the same optical axis, and the initial setting state of the measuring device is measured by receiving the laser beam with the light receiving device.

In addition, since the light projected in the front-back direction on the same optical axis is provided simultaneously by the light receiver and the light-receiving device, the deviation of the borehole can be measured individually, so by comparing these, the measurement status can be accurately determined. This enables accurate understanding and improves measurement accuracy.

<<Example>> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 and 2 show an embodiment of the hole bending measuring device according to the present invention, and FIG. 3 is an explanatory diagram of the measuring method.

The measuring device shown in the figure consists of a measuring tube 16, which is rotatably connected to one end of a pair of hollow cylindrical leading and trailing cylinders 10 and 12 of approximately the same length through a ball joint 14, and A light receiver 18 is installed near the front end of the cylinder body 10 so as to be perpendicular to the cylinder axis, and a light receiver 18 is installed on the cylinder axis near the front end of the trailing cylinder body 12 and is on the same optical axis that almost coincides with the cylinder axis. Light in front and back direction (S1,
S2) and a laser emitting device 20 for projecting.

The light receiver 18 includes, for example, a CCD element in X and Y directions.
A target placed in the direction is used so that the position of the area irradiated with the beam S1 from the laser emitting device 20 can be determined.

A plurality of rotating rollers 22, 22 for moving the measuring tube 16 are mounted below the cylinders 10, 12, and the moving length of the rotating roller 22 is controlled by, for example, a stepping motor. The length of the movement is detected, and this measuring device
The measurement is performed by sequentially moving in an inchworm-like manner by 1/2 the length (2L) between the rotating rollers 22 at the ends.

The measurement pipe 16 is located in an approximately horizontally dug hole 24.
However, the pipe 2 is inserted into the excavation hole 24 in advance.
6 is inserted.

The pipe 26 is flexible enough to deform along the curve of the excavated hole 24, and is suitably made of, for example, a vinyl chloride pipe or a relatively solid aluminum pipe.

Further, a concave rail 27 is installed inside the pipe 26 and extends along the axial direction of the pipe 26.
Each of the rollers 22, 22 of 6 is placed on this rail 27, and supported so that the central axis of the pipe 26 and the axis of the measurement tube 16 coincide at the three points where the rollers 22 and the rail 27 contact. do.

In the measurement method, first, the device is adjusted so that the light beam (S1) from the laser emitting device 20 of the measurement tube 16 irradiates the center of the light receiver 18, and then the device is installed at the starting position in the excavation hole 24.

After that, electricity is supplied to the laser emitting device 20 to project the light beams S1 and S2 in the front-back direction.

The forward light beam S1 illuminates the light receiver 18, and the deviation between the leading and trailing cylinders 10, 12 is measured.

The rear light beam S2 is received by a light receiving device 28 such as a camera, a screen, or the same as the light receiving device 18 described above, and the positional relationship between the light receiving device 28 and the excavation hole 24 is determined. How the hole 24 is initially set is measured.

Once the initial state measurements have been taken, measurements are repeated one after another while moving the measuring tube 16 by L towards the back of the excavated hole 24. The method will be explained based on FIG. 3.

The figure shows 1/2 of the length 2L between the support points of the measurement tube 16,
In other words, the point L is shown as P0 to Pn, and in the initial state set at the starting position, there is no error due to the initial setting measurement described above, and the diagram assumes that the measurement pipe 16 is installed at the center of the excavation hole 24. Moreover, only one of the orthogonal coordinates is shown.

In the first measurement, the measurement tube 16 moves forward by L, and P0 moves to P1.

Here, if the leading cylinder 10 is deviated by an angle of θ1 with respect to the trailing cylinder 12, the forward laser beam S1 to the light receiver 18 will irradiate a position deviated by X1.

Expressing this state in a formula, regarding the light receiver 18, X1=Lsinθ1.

When the measurement of X1 is completed, turn the measurement tube 16 to L again.
only move forward.

In this state, the deviation X2 of the photoreceiver 18 is X1 + Lsin (θ1 + θ2).

On the other hand, the backward laser beam S toward the light receiving device 28
starts with the second measurement and irradiates a location shifted by d1. That is, regarding the light receiving device 28, X1 = d1/2 (here, each deviation angle θ1, θ2... is small,
It is assumed that the approximations of sin θ≒θ and cos θ≒1 hold true. ), and the deviation X1 obtained by measuring d1 in the light receiving device 28 and the deviation X1 regarding the light receiving device 18 can be determined separately. Hereinafter, in the third measurement, the deflection X3 of the light receiver 18 is X2 + Lsin (θ1 + θ2 + θ3), whereas the deflection X2 of the light receiver 28 is (4d1 + d2)/3. It can be compared with X2 determined by the light receiver 18. Therefore, the n-th deviation Xn at the optical receiver 18 is Xn-1+Lsin _o 〓 ^i=l θi, which is
= {(n+2)dn-1+dn}/(n+1).

The measurement of the deviation amount of the borehole 24 by the light receiver 18 and the light receiver 28 as described above can be carried out until the backward laser beam S2 can no longer reach the starting position of the borehole 24. Since the curve is gentle, this measurement can be made quite deep.

As described above, the measurement values of the forward laser beam S and the light receiver 18 by the original measurement tube 16 and the measurement values of the rear laser beam S and the light receiver 28 are measured at several locations from the starting position of the drilling hole 24. By comparing points, the reliability of subsequent measurements by the measurement tube 16 can be ensured.

In addition, until the rear laser beam S2 is no longer visible from the starting position, highly accurate measurements are performed by comparing the individually measured values, so the starting point of the measurement point can be effectively advanced to this point in the drilling hole 24. The actual measurement length is reduced by this amount, and the measurement accuracy is improved.

≪Effects of the Invention≫ As detailed above, the hole bending measuring device of the present invention can be used in small-diameter excavated holes such as boreholes and advanced guide holes that cannot be accessed by humans.
The deflection of the hole is measured by comparing the deflection measured by projecting the laser to the front receiver and the deflection measured by projecting the laser to the rear receiver at the same position at any time during the measurement. By doing so, it is possible to prevent measurement errors from accumulating due to errors in initial setting of the device, and to easily obtain accurate measurement results.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the installed state of the device of the present invention, Figure 2
The figure is a longitudinal sectional view of FIG. 1, and FIG. 3 is an explanatory diagram of the measurement state. 10... Leading cylinder body, 12... Trailing cylinder body, 14...
...Ball joint, 16...Measuring tube, 18...
Light receiver, 20...Laser emitting device, 22...Rotating roller, 24...Drilling hole, 26...Pipe, 2
8... Light receiving device.

Claims (1)

[Claims] 1. A measurement method in which one end of a pair of leading and trailing cylinders is rotatably connected to each other, and is inserted into a small-diameter excavation hole such as a borehole or an advanced guide hole that cannot be accessed by humans, and moves along the borehole. a tube, a light receiver built into the leading barrel, a laser emitting device built into the trailing barrel that projects light in the front-rear direction on the same optical axis, and a light receiver provided at the mouth of the excavation hole. a device, and measures the deflection of the leading barrel body by projecting a laser onto the light receiver in front at the same position.
A hole curvature measuring device characterized in that the curvature of the hole is measured while comparing the deflection of the trailing cylinder body measured by projecting a laser onto the light receiving device at the rear.