JPH0754255B2 - Position measurement method for cylindrical structures - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the position of a cylindrical structure, and more particularly to a method for measuring the position on the outer peripheral surface of a cylindrical structure from a remote location outside in the horizontal direction. .

"Prior art and its problems" When installing accessories such as nozzles on the peripheral wall due to additional work after the standing of a cylindrical structure such as a tank, the cylindrical structure is determined by actually measuring the mounting position determined on the drawing. Things need to be marked.

Conventionally, when measuring a mounting position or the like of a cylindrical structure, an azimuth angle such as a mounting position is designated on a drawing with respect to a reference azimuth line preset in the cylindrical structure, The mounting position and the like are calculated by measuring the designated azimuth angle from the center position of the curvature using a transit or the like.

However, with such a measuring method, when the cylindrical structure is filled with oil, gas, etc. and cannot enter, or when another structure is arranged at the center of curvature of the cylindrical structure. However, there is a problem that it becomes impossible to measure.

"Object of the Invention and Means for Achieving the Same" The present invention effectively solves the above-mentioned problems, and an object thereof is to provide a method of measuring from the outside of a cylindrical structure. A gyrocompass and a distance meter are installed at a position spaced horizontally outward from the polar coordinate distances and true north directions at arbitrary three points along the circumferential direction on the outer peripheral surface of the cylindrical structure with the installation position as the origin. While measuring each azimuth angle, the center of curvature of the cylindrical structure and the outer diameter are calculated based on these measured values, and the calculation result and the difference in angle between the true north direction of the reference azimuth line and the designated azimuth angle are calculated. Due to
The feature is that the measured position is determined and measured and determined by a gyro compass and a distance meter, and the measured position is determined by measurement from a remote place outside the cylindrical structure and calculation based on the measured value. It was done like this.

[Example] An example of the method for measuring the position of a cylindrical structure according to the present invention will be described below with reference to the drawings.

First, the measuring device used for carrying out the method of the present invention will be described. The measuring device 1 is the “azimuth measuring device” of Japanese Patent Application No. 58-192470 filed by the applicant of the present invention. As shown in FIG. 1, a gyro compass 2 and a range finder 3 are provided, and a central processing unit 4 that performs calculations and the like to be described later based on these measured values is connected in series. ing. The gyro compass 2 has an indicator needle having a finger northing property, measures the azimuth angle of the measured position with respect to the true north direction N indicated by the indicator needle, and includes a horizontal level adjusting mechanism and the like. ing. Further, the range finder 3 remotely measures the linear distance to the measured position using light waves, laser light, ultrasonic waves, etc., and measures the distance from the rotation center of the pointer to the gyro compass 2. It is mounted so that it can be rotated horizontally. The central processing unit 4 includes a gyro compass 2 and a rangefinder 3
The measured values input from and are calculated, and the calculated values are displayed on the printer 4a.

Next, using the measuring device 1 as described above, the designated azimuth angle θ is set with respect to the reference azimuth line Tn of the cylindrical structure 5 in the standing state.
A method of measuring the position X on the outer peripheral surface at a distance will be described.

First, as shown in FIG. 1, the measuring device 1 is installed at an arbitrary position outside the horizontal of the cylindrical structure 5, fixed at a horizontal level, and the gyro compass 2 is activated to bring it into a static state.
Then, with the installation position of the measuring device 1 as the origin of polar coordinates, azimuths with respect to the true north direction N at arbitrary three points A, B, and C along the circumferential direction on the outer peripheral surface of the cylindrical structure 5 shown in FIG. The angles θ ₁ , θ ₂ , and θ ₃ are set by the gyro compass 2 and the horizontal straight line distances (polar coordinate distances) ρ ₁ , ρ ₂ , and ρ ₃
Are measured by the distance meter 3, respectively. Next, based on these measured values, the polar coordinate distance ρ ₀ about the center of curvature P of the cylindrical structure 5 and the azimuth angle θ with respect to the true north direction N.
₀ and the outer diameter D of the cylindrical structure 5 are calculated as follows.

That is, the polar equation of the circle is ρ ² −2ρ ₀ ρcos (θ′−θ ₀ ′) + ρ ₀ ² − (D / 2) ² = 0, but the azimuth angle measured by the measuring device 1 is the true north direction N. Θ ′ = (π / 2) −θ,
θ ₀ ′ = (π / 2) −θ ₀ , and when this is substituted into the above equation, ρ ² −2ρ ₀ ρcos (θ ₀ −θ) + ρ ₀ ² − (D / 2) ² = 0. This polar equation is measured at each measurement point A (ρ ₁ , θ ₁ ′), B
(Ρ ₂ , θ ₂ ′) and C (ρ ₃ , θ ₃ ′) are respectively obtained, ρ ₁ ² −2ρ ₀ ρ ₁ cos (θ ₀ −θ ₁ ) + ρ ₀ ² − (D / 2) ² = 0 ρ ₂ ² -2 ρ ₀ ρ ₂ cos (θ ₀ −θ ₂ ) + ρ ₀ ² − (D / 2) ² = 0 ρ ₃ ² −2 ρ ₀ ρ ₃ cos (θ ₀ −θ ₃ ) + ρ ₀ ² − ( D / 2) ² = 0, and from these equations However, α = ρ ₁ (ρ ₂ ² −ρ ₃ ² ) β = ρ ₂ (ρ ₃ ² −ρ ₁ ² ) γ = ρ ₃ (ρ ₁ ² −ρ ₂ ² ) Are required respectively.

Next, an angle difference θn between these θ ₀ , ρ ₀ , and D and the true north direction N in the reference azimuth line Tn of the cylindrical structure 5 preset in the design stage, and the designated azimuth from the reference azimuth line Tn. Angle θa
By using, the azimuth angle θx and the polar coordinate distance ρx with respect to the true north direction N of the measured position X are obtained. That is, as shown in FIG. θb = (θa + θn) − (θ ₀ + π), and θx = θ ₀ −θy from these θy and θb. Becomes

Such calculation is performed by the central processing unit 4, and the final data θx, ρx is displayed while displaying each data of θ ₀ , ρ ₀ , D by the printer 4a as necessary. Then, these θx and ρx are actually measured by the gyro compass 1 and the distance meter 2, and the position X on the outer peripheral surface of the cylindrical structure 5 is determined.

As for the position of the measured position in the height direction, the measuring point of the measuring position 1 is previously aligned with the designated height dimension of the measured position, or the position obtained by measuring the measuring position 1 is the measuring device. It can be obtained by correcting according to the height of 1.

"Effects of the Invention" As described above, according to the position measuring method for a cylindrical structure of the present invention, the gyro compass and the distance meter are installed at the horizontal outer position of the cylindrical structure, and the installation position is set. Measures the azimuth angle and distance at any three points on the outer peripheral surface of the cylindrical structure as the origin of polar coordinates, and performs the measurement by a relatively simple calculation from the curvature center position and the outer diameter calculated based on these measured values. The position can be determined, and the position can be actually measured by a gyrocompass and a distance meter to mark the cylindrical structure. Therefore, the measurement can be performed from a remote place without entering the inside of the cylindrical structure, and the measurement can be effectively performed when the measurement inside the cylindrical structure is difficult. Since the measurement can be performed from the position, the limitation of the measurement conditions is reduced, and the present invention can be applied to various cylindrical structures.

[Brief description of drawings]

The drawings show an embodiment of the method for measuring the position of a cylindrical structure according to the present invention, and FIG. 1 is a schematic view showing an example of a measuring apparatus used for carrying out the measurement method according to the present invention.
FIG. 3 and FIG. 3 are polar coordinate diagrams of FIG. 1 shown for explaining the method of calculating measured values. 1 ... Measuring device, 2 ... Gyro compass, 3 ... Distance meter, 4 ... Central processing unit, 4a ... Printer, 5 ... Cylindrical structure.

Claims (1)

[Claims] 1. A method for measuring a position on an outer peripheral surface of a cylindrical structure in an upright state at a designated azimuth angle with respect to a reference azimuth line, wherein the gyro is located at a position spaced horizontally outward from the cylindrical structure. A compass and a distance meter are installed, and polar coordinate distances and azimuths with respect to the true north direction at arbitrary three points along the circumferential direction on the outer peripheral surface of the cylindrical structure with the installation position as the origin are measured, respectively. Based on the value, the polar coordinate distance about the center of curvature of the cylindrical structure and the azimuth angle with respect to the true north direction, and the outer diameter of the cylindrical structure are calculated, and these calculation results and the angle difference with respect to the true north direction of the reference azimuth line and From the specified azimuth angle, the polar coordinate distance and the azimuth angle with respect to the true north direction of the measured position are determined, and the polar coordinate distance and the azimuth angle are calculated from the gyrocompatibility Position measuring method of the cylindrical structure and determining a measured position measured by and rangefinder.