JP2682513B2 - Inclination measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for measuring the amount of tilt of a building, a drilling support or the like.

[0002]

2. Description of the Related Art A conventional inclination amount measuring device of this type is shown in FIG.
As shown in FIG. 2, a laser emitting device 22 that is attached to one end of a long column 21 (a cylindrical support frame for confirming whether or not an excavation hole is vertically excavated) and emits a laser beam in the axial direction thereof. , A gimbal structure 23 that is interposed between the long pillar 21 and the laser emitting device 22 to keep the direction of the laser light unchanged regardless of the inclination of the long pillar 21, and the other end of the long pillar 21. A rotary table 26 provided on the axis and rotating at a constant speed on a plane orthogonal thereto, a rotary light-receiving arm 24 mounted on the rotary table 26, and a drive circuit 2 for rotating the rotary table 26.
5, a plurality of photoelectric conversion elements (not shown) provided side by side on the rotary light-receiving arm 24, and a rotation table 26 provided inside the rotary base 26 to detect the rotation angle of the rotary light-receiving arm 24, such as rotation of a potentiometer or resolver. The angle detecting means is provided, and the laser light which is relatively displaced due to the inclination of the long column 21 is rotated and received by the rotating light receiving arm 2.
The amount of tilt of the long column 21 is measured from the position and rotation angle of the photoelectric conversion element that receives light when 4 crosses (JP-A-57-7509).

That is, in FIG. 3, since the laser emitting device 22 is mounted on the gimbal 23, the long column 21
However, the laser beam is always emitted in the vertical direction. Therefore, when the long column 21 is inclined by the angle β, the axis of the long column 21 with respect to the vertical downward axis is from the initial position Z−Z to Z _0.
Tilt to the Z ₀ axis.

[0004]

In this conventional tilt amount measuring device, it is necessary to dispose the light-transmitting part and the light-receiving part separately, and if the distance is large, the setting and adjustment of the device become very complicated. However, a gimbal structure that always keeps the direction of the laser light unchanged is required, and there is a drawback that the device is complicated and expensive.

An object of the present invention is to provide an inclination amount measuring device having a relatively simple structure and easy to adjust and set.

[0006]

A tilt amount measuring device of the present invention is attached to one end of a structure of a long column, rotates about an axis parallel to the longitudinal axis of the long column, and is preset. A reflection mirror obliquely attached to the rotation axis at a predetermined angle, a rotation angle detector for detecting a rotation angle of the reflection mirror, and a laser beam with respect to the reflection mirror parallel to the rotation axis of the reflection mirror. A laser transmitting section for emitting the laser beam, a laser receiving section for receiving the laser beam reflected by the reflecting mirror in parallel to the rotation axis of the reflecting mirror, and a laser beam emitted from the laser transmitting section for the reflecting mirror. From the reflection point of the laser light on the reflection mirror to the laser on the plane from the time until the laser light is received by the laser receiving section and the propagation speed of the laser light. A distance calculation device for calculating a distance to the reflection point of the light, and a memory circuit for storing the distance corresponding to the rotation angle of the reflecting mirror, and said set angle,
It has a tilt angle calculation device for calculating the tilt angle of the long column from distance data at a plurality of rotation angles stored in the memory circuit.

[0007]

[Operation] Since the laser light transmitter and the light receiver are housed in an integrated unit and the inclination angle is calculated in advance from the irradiation angle of the laser light and a plurality of different distance data, the inclination angle measurement is simplified. In addition, since the conventional gimbal structure is unnecessary, the cost of the device is reduced.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a tilt amount measuring apparatus according to one embodiment of the present invention, and FIGS. 2A and 2B are laser irradiation angles θ and measurement when the apparatus according to this embodiment is applied to a building. It is a figure which shows the relationship of the distance R about the case where there is no inclination and the case where there is inclination.

The reflecting mirror 4 is rotationally driven by the mirror driving unit 5 with an axis parallel to the longitudinal axis of the long cylinder as a rotation axis.
It is attached to the rotating shaft at an angle of 90 ° -θ. The rotation angle detector 6 detects the rotation angle of the reflection mirror 4 . The laser light transmitter 2 is, for example, a laser diode, and emits laser light 7 to the reflection mirror 4 so as to be parallel to the rotation axis of the reflection mirror 4. The laser light receiving unit 3 receives the laser light reflected by the reflection mirror 4 in parallel with the rotation axis of the reflection mirror 4. The amplifier circuits 8 ₁ and 8 ₂ amplify the electric signals from the laser light transmitter 2 and the laser light receiver 3, respectively, and the waveform shaping circuits 9 ₁ and 9 ₂ waveform-shape the outputs of the amplifier circuits 8 ₁ and 8 ₂ , respectively. . The flip-flop 10 is set by the light transmission signal pulse of the laser light transmission unit 2 and reset by the light reception signal pulse of the laser light reception unit 3. The gate circuit 12 opens the gate when the flip-flop 10 is set. The counter 13 counts the clock signal output from the clock generator 11 while the gate circuit 12 is open. The distance calculation circuit 14 obtains the distance R from the reflection point of the laser light 7 on the reflection mirror 4 to the reflection point on the ground from the value T of the counter 13 and the propagation speed C of the laser light by a calculation formula of R = C · T / 2. . The memory circuit 15 stores the distance R corresponding to the rotation angle of the reflection mirror 4. As shown in FIG. 2B , the B-C distance calculation circuit 16 calculates 180 degrees from each other based on the distance data acquired from the memory circuit 15 while the reflection mirror 4 makes one rotation .
The distance R ₂ to the point B on the plane located at the rotation angle of
Use a large value), the distance to the point C R ₁ (minimum value), the two points B
The separation distance L between the -C L = from equation ^{_{(1) {R 1 2 +}} R 2 2 -2R 1 R 2 cos2θ} 1/2 ···· (1) obtaining. The inclination angle calculation circuit 17 obtains the inclination angle α of the long cylinder from the equation (2). Note that FIG. 2B shows that
The points of maximum and minimum distances that occur are defined as points B and C, respectively.
The distance R ₂ is always the maximum and the distance R ₁ is the minimum.
It doesn't happen.

Α = cos ⁻¹ (R ₁ sin2θ / L) −θ or θ−cos ⁻¹ (R ₂ sin2θ / L) (2) R ₁ = R ₂ (FIG. 2A) When, L = 2R sin θ
And α = 0. In the above embodiment, the tilt amount in the plane of ABC was obtained from the two data R ₁ and R ₂ , but it is also possible to obtain the tilt amount three-dimensionally using a plurality of data. Moreover, although the example applied to the beam 1 of a building was described, it can generally be applied to the measurement of the inclination of a long column.

[0012]

As described above, the present invention has a structure in which the laser light transmitting portion and the laser light receiving portion are housed in an integrated unit, and the laser light irradiation angle and a plurality of different distance data are used in advance. By calculating the angle, the tilt angle can be easily measured, and the conventional gimbal structure is not required, so that an inexpensive device can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram of a tilt amount measuring device according to an embodiment of the present invention.

[FIG. 2] When the beam of the building is not inclined (FIG. 2 (A)),
It is a figure which shows the relationship between the laser irradiation angle and the measurement distance R when there is an inclination ((B) of the same figure).

FIG. 3 is a side view (FIG. 3A) of a tilt amount measuring device of a conventional example, and a sectional view taken along the line AA of FIG. 3A (FIG. 3B).

[Explanation of symbols]

1 Building Beam 2 Laser Transmitter 3 Laser Receiver 4 Reflecting Mirror 5 Mirror Drive 6 Rotation Angle Detector 7 Laser Light 8 ₁ , 8 ₂ Amplifying Circuit 9 ₁ , 9 ₂ Wave Shaping Circuit 10 Flip-Flop 11 Clock Generation Circuit 12 Gate circuit 13 Counter 14 Distance calculation circuit 15 Memory circuit 16 BC distance calculation circuit 17 Tilt angle calculation circuit

Claims (3)

(57) [Claims] 1. Attached to one end of a long column structure,
A reflection mirror that rotates about an axis parallel to the longitudinal axis of the long column and is obliquely attached to the rotation axis at a preset angle, and a rotation angle detection that detects the rotation angle of the reflection mirror. And a laser transmitting unit that emits laser light to the reflection mirror in parallel with the rotation axis of the reflection mirror, and receives the laser light reflected by the reflection mirror in parallel with the rotation axis of the reflection mirror. Laser receiving section and the laser light emitted from the laser transmitting section is reflected by the reflection mirror, reflected by a certain plane, reflected by the reflection mirror, and the time until the laser reception section receives light and the laser. A distance calculation device that calculates the distance from the reflection point of the laser light on the reflection mirror to the reflection point of the laser light on the plane from the propagation velocity of light; and the distance corresponds to the rotation angle of the reflection mirror. And a tilt angle measuring device for calculating the tilt angle of the long column from the set angle and distance data at a plurality of rotation angles stored in the memory circuit. . 2. The distance calculating device amplifies the signal from the laser light transmitting section to shape the waveform and a first amplifier circuit and a first waveform shaping circuit, and amplifies the signal from the laser light receiving section. A second amplifier circuit and a second waveform shaping circuit for shaping the waveform, a flip-flop set by the output signal of the first waveform shaping circuit and reset by the output signal of the second waveform shaping circuit, and a clock generation Circuit, a gate circuit that outputs a clock signal output from a clock generation circuit while the flip-flop is set, a counter that counts the clock signal output from the gate circuit, a count value of the counter, and a laser The tilt amount measuring device according to claim 1, further comprising a distance calculation circuit that calculates the distance from a propagation velocity of light. 3. The tilt angle calculating devices are 180 ° from each other.
A distance calculation circuit that calculates the distance between the two points located at the rotation angle of the point and the set angle, the set angle, the distance, and the distance to the two points. 3. The tilt amount measuring device according to claim 1, further comprising a tilt angle calculating circuit that calculates a tilt angle of the long column from either one of the above.