JPH02201216A - Measuring apparatus for hole bend - Google Patents

Abstract

PURPOSE:To enable accurate measurement of an angle of inclination by subtracting a set value from a correction value setting section from an inclination angle signal from a sensor section to the output of an angle of inclination of a hole to be measured. CONSTITUTION:A digital signal being fed from a sensor section is received with a transmitting/receiving section 41, an output of which is sent to a computing/controlling section 43. In the setting of an correction value of a bias value of an accelerometer, both heights at the tip and the rear end of a signal converting section 19 are measured to calculate an angle of inclination of the sensor section from a difference between the heights and a distance between both measuring positions. An output value of the computing/controlling section 43 is outputted to determine the output value and a measured value and then, a value of the difference is set with a correction value setting section 45. The value set is read out with the computing/controlling section 43 to be subtracted from a digital value of an inclination signal from the accelerator fed from the sensor section ad the resulting output value is displayed or printed out with an output section 44. Thus, an highly accurate angle of inclination can be measured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hole bending measuring device for measuring the three-dimensional position of a small-diameter hole used in civil engineering work and the like.

[Conventional technology]

In various hole drilling works carried out in civil engineering works, etc.,
BACKGROUND OF THE INVENTION Large-scale construction works of various diameters are being constructed, from relatively small diameter holes used for water, electricity, gas, sewage, etc. to large diameter holes typified by subways, tunnels, etc. During these various hole drilling operations, due to obstacles, bedrock, etc.
There are many demands for holes with various curves in addition to straight holes in the horizontal plane, and three-dimensional understanding of the position of the drilled hole is an extremely important issue.

Conventionally, when drilling large-diameter holes, the method used was to measure the location by human surveying, adjust the direction and posture of the drilling machine, and proceed with drilling. Due to recent machine automation, the latest hole drilling machines are equipped with a gyro compass and inclinometer, and measure the azimuth angle, distance, roll angle, and pitch angle from the gyro compass, so that the hole drilling machine can be drilled from time to time. Know the location of excavation equipment,
It has a function to automatically correct deviations from the planned course.

However, automation of drilling machines for these holes is limited to large-diameter shield machines, and it is often impossible to even measure small-diameter holes with a diameter of 10 cm or less. For example, in the case of a straight hole, a sensor with multiple light emitting sources arranged linearly at equal intervals at the tip is inserted into the hole to be measured, and depending on how far the light emitting sources are visible from the hole entrance, There was a way to measure the bending angle. However, if the hole was significantly bent, the light source could not be seen using this method, making it impossible to measure.

Another method is a hole bending measuring device using a free gyro and an inclinometer as shown in FIGS. 2 and 3.

FIG. 2 shows an outline of this conventional hole bending measuring device. Second
In the figure, (1) is a sensor unit that measures the azimuth and inclination angle of the hole to be measured, and this is configured by housing various sensors such as a gyro accelerometer in a water pressure container.

Signals from various sensors built into this water pressure container are
Connector (2) and long distance cable (3) (e.g. 5
00m long) to the display/operation unit (4), where the system displays the output values of each sensor. In FIG. 2, (SW) indicates an on/off switch of the device.

By the way, the sensor section (1) inside the water pressure container shown in Fig. 2
The internal structure is as shown in FIG. The input axis (Z-Z') direction of the sensor section (1) in FIG. 2 coincides with the (Z-Z') direction in FIG. 3.

In Fig. 3, (5) is a free gyro with two degrees of freedom that is fixed to a water pressure vessel, and its input axis is in the (Z-Z') direction and the (Y-Y') direction. (vertical direction)
is set, and the (Z-Z') axis and (Y
-Y') The turning angle in the axial direction is being measured. Also, (10
) is a platform, and on this platform (10), there are two accelerometers (11) and (12), and the input axis of one (12) is (Y-Y') and (Z-Z') (
7) In the (X-X') axis direction perpendicular to both wheels, the other (11)
The input shaft of is installed so as to be in the (Z-Z') axis direction. This platform (10) is rotated in the (Z-Z') direction by two shafts (8) and (9) supported by two bearings (6) and (7) fixed to a water pressure vessel. It can be rotated around.

A signal from an accelerometer (12) that measures the inclination angle of the platform (10) in the (X-X') direction is supplied to a servo motor (14) via a servo amplifier (15) to drive it; rotating the shaft (9) via the gear train (13);
The platform (lO) is in the (X-X') axis direction,
This is controlled so that the posture is always constant. Therefore,
The accelerometer (11) installed on the platform (10) with its (Z-Z') direction as the input axis measures the inclination angle from within the horizontal plane including the (Z-Z') axis direction of the platform (10). I will do it. The output signal of this accelerometer (11) is supplied to an A/D converter (17) via a slip ring (not shown) and a low-pass filter (16), thereby converting it into a digital signal.

On the other hand, the azimuth signal around the (Y-Y') direction of the free gyro (5) is converted into a digital signal by the A/D converter (18). Both A/D converters (17), (18)
The output digital signal is converted into a signal by a signal conversion section (19), and this is transferred as an output of the sensor section (1) to a display/operation section (4) shown in FIG.

When the sensor part (1) configured in this way is inserted into the hole to be measured and kept stationary, the sensor part (1)
) in a rectangular coordinate system in which the position of the hole to be measured before insertion is the origin 0 and the xoy plane is the horizontal plane, and if point P is the current position of the sensor part (1) in the hole to be measured, then the origin 0
and the straight line 100' that connects the projected point P' on the horizontal plane of point P and X
The angle Φ with the axis and the angle θ with OP from the straight line 100' in the horizontal plane are measured as the output signal of the free gyro (5) and the inclination angle signal of the accelerometer (11). Therefore, the length of the straight line OP is longer than the length of the cable (3) from the display/operation section (4) to the sensor section (1)! When measuring, the position of point P (ΔX, Δy, Δ2) is Δx=l−cosθ' cosΦ−・・・(1)Δ
y=j2-cosθ・sinΦ,... (2
) Δz=f−sinθ (3). Therefore, the position of the hole to be measured can be measured by sequentially moving the sensor section (1) inside the hole to be measured and adding together the values obtained from equations (1) to (3). .

[Problem to be solved by the invention]

However, in such conventional hole bending measuring devices for small diameter holes, the output value of the accelerometer that measures the inclination angle fluctuates depending on the temperature, making it impossible to accurately measure the inclination angle.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a hole bending measuring device that solves the above problems.

[Means and effects for solving the problem] The hole bending measuring device according to the present invention includes a correction value setting section (45) consisting of a digital switch for correcting the bias value of the accelerometer, etc. in the display/operation section (4). The accelerometer (
By subtracting the steady bias value in the usage environment from the output of step 11), an accurate tilt angle that is not affected by the usage environment is obtained.

〔Example〕

Hereinafter, one embodiment of the present invention will be explained using FIG. 1.

FIG. 1 is a block diagram showing the display/operation section (4) of the present invention. The other configurations of the present invention, although not shown, are completely the same as the conventional example shown in FIGS. 2 and 3.

That is, as shown in FIGS. 2 and 3, an accelerometer (11
) is output from the signal converter (19) of the sensor unit (1).
The signal is then sent as a digital signal to the display/operation section (4) via the cable (3).

In the present invention, as shown in FIG. 1, the digital signal sent from the sensor section (1), that is, the signal conversion section (19) via the cable (3) is transmitted to the transmitting/receiving section of the display/operating section (4). 41) and sends its output to the calculation/control unit (43). (45) is a correction value setting unit for setting a value for bias value correction of the accelerometer (11), and is composed of a digital switch and the like. To set this correction value, for example, after fixing the sensor section (1) so that it does not move, measure the heights of both the tip and rear ends of the sensor section (1) by rotating the transit within the same horizontal plane. The inclination angle of the sensor section (1) is calculated from the difference in height and the distance between the fixed positions on both sides. In addition, the output value of the calculation/control unit (43) is transmitted to the output unit (43).
4) or print it out, and print it out on the output section (4).
4) Find the difference between the output value and the above measured value. The value of this difference is set by a correction value setting section (45).

The value set by the correction value setting section (45) is read by the calculation/control section (43) and subtracted from the digital value of the tilt angle signal from the accelerometer (11) sent from the sensor section (1). The output value is displayed or printed out at the output section (44). In this way, the environmental conditions in which the hole bending measuring device can be used are widened, and the inclination angle can be determined correctly even in extremely cold or hot regions without being affected by the bias temperature sensitivity of the accelerometer (11). It can be measured. The operation section (42) is an operation switch section for starting and stopping the sensor section (1), a measurement start switch, a printout command, and the like.

〔Effect of the invention〕

According to the present invention, the inclination angle can be measured with high accuracy using an inexpensive accelerometer regardless of the environmental temperature being measured, and the acceleration needle can be easily calibrated at the actual construction site. are doing.

In addition, when the planned drilling hole has a fixed inclination, if a fixed inclination angle is used from the inclination angle correction value setting unit of the present invention in measuring the inclination angle of the hole after excavation, the output from the output unit represents the inclination error of the hole during construction, so
Data analysis becomes unnecessary, making it easier to understand the construction status.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the display/operation section of the present invention, Fig. 2 is a configuration diagram of a conventional hole bending measuring device, Fig. 3 is a perspective view of the main part of the sensor section of the conventional device, and Fig. 4 is a block diagram of the display/operation section of the present invention. FIG. 2 is a route map for explaining the operation of a conventional device. In the figure, (1) is the sensor section, (4) is the display/operation section,
(41) is a transmitting/receiving section, (42) is an operating section, (43) is an arithmetic/control section, (44) is an output section, and (45) is a correction value setting section.

Claims (1)

[Claims] a sensor unit that measures the azimuth and inclination angle of the hole to be measured;
It has an azimuth and inclination angle measuring device consisting of a connection cable that transmits the signal of the sensor section, and a display/operation section that transmits, receives, controls, and displays the signal of the sensor section. A correction value setting section is provided, and the set value from the correction value setting section is subtracted from the inclination angle signal from the sensor section to output the inclination angle of the hole to be measured. Bending measurement device.