JPS6126602B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for positioning a working platform at sea.

There are various types of offshore work vessels that operate on a predetermined location on the sea.For example, they mix the soft ground on the seabed with a stirring treatment machine and mix it with caking agents. In the work of hardening and forming a support layer, the agitation processing machine is supported by a boat platform positioned on the sea, so the positioning of the boat platform is important for accurately constructing the support layer in the set position. This is an important element.

The positioning of the platforms used in such offshore operations generally uses transit, laser,
Equipment such as a light wave distance meter and a gyro compass reflector are used, but according to the conventional method of positioning the ship's platform, the measurement operation is complicated because it is performed by a combination of these equipment, or the angle measurement using a transit is too small. There are still problems with accuracy and operation, such as the error increasing in proportion to the distance between the reference point and the platform.

Therefore, as a result of studies in view of the above-mentioned conventional circumstances, the present invention proposes a method for positioning a boat platform at sea, which can be performed quickly and accurately with simple operations, and with a small number of operators. The purpose of this is to place two reflecting mirrors at the distance from the reference position, two light wave rangefinders on the ship's platform at any two points, and one light wave distance. Calculate the coordinates of the two points on the ship's platform based on the measured values obtained by sighting one point on the reflector with the meter and the two points on the reflector with the other light wave distance meter, and aligning these with the planned values. The purpose of this is to set the boat platform in a predetermined position.

The method of the present invention will be explained in detail below based on the drawings. First, in FIG.
1 is a ship's platform floating on the sea, and 2 is a reference position set on a survey platform or land.

As shown in the figure, two light wave distance meters 3 and 4 are placed on the boat platform 1 at two points A and B at arbitrary distances, and a reflector 5 is placed at two points C and D at arbitrary distances at the reference position 2. ，
6, and the two optical distance meters 3 and 4 mentioned above.
are connected by lead wires 8 and 9 to a computer 7 placed on the boat platform 1, respectively, and two display sections 10 and 11 are connected to the computer 7.

The light wave rangefinders 3 and 4 are designed to measure the distance between the lightwave rangefinder and the reflector based on the time required for the light wave to enter the lightwave rangefinder after the projected light is reflected by the reflector. A known method can be used.

Therefore, measurements for positioning the boat platform 1 are performed according to the following procedure.

First, on the boat platform 1, one of the optical distance meters 3
The reflecting mirror 5 is collimated with the light wave distance meter 4, and the reflecting mirrors 5 and 6 are collimated with the other light wave distance meter 4.

Of course, one lightwave rangefinder 3 may be used to collimate the reflectors 5 and 6, and the other lightwave rangefinder 4 may be used to collimate the reflector 6. It is sufficient to sight one point on the reflecting mirror, and sight two points on the other reflecting mirror using the other light wave distance meter.

Through such operations, the distance 1 between points A and C, the distance 2 between points B and D, and the distance 3 between points B and C are measured by the optical distance meters 3 and 4, respectively.

After measuring each of the above distances 1, 2, and 3, the coordinates of points A and B on the platform 1 are calculated using the formula described below based on these measured values, and the results of the calculation are set in advance. The calculated positioning values of the boat platform 1 are compared and the differences are displayed on the display units 10 and 11, respectively.
However, the boat operator determines the direction and amount of movement of the platform 1 with respect to the planned values while looking at the coordinates of the points A and B displayed on the display sections 10 and 11, and moves the platform 1 in a predetermined direction. While moving closer to the planned position, the platform 1 is positioned at the planned position where the coordinates of the points A and B coincide with the planned values.

After positioning in this way, the boat platform 1 is supported in a predetermined position with, for example, an anchor rope, and the boat platform 1 is
is fixed at a predetermined position, and marine operations are performed on the platform 1.

The above-mentioned collimation between A and C, between B and C, and between B and D is performed artificially by a total of two operators assigned to the two optical distance meters 3 and 4, respectively, and as a result, The measurement of the distances 1, 2, and 3 between the above distances and the calculation of the coordinates of point A and point B based on these measured quantities are carried out by storing calculation formulas described later in advance in each light wave distance meter 3 and 4. This is done mechanically and electrically by the computer 7.

In addition, the display units 10 and 11, as shown in FIG.
The intersection O of the x-axis 12 and y-axis 13 is the above point A and B, respectively.
The ship operator can move the platform 1 by looking at the coordinates of point A and point B at the measurement position, which are set in advance as planned values for positioning points, and which are represented by (x1, y1) and (x2, y2) in the figure. It is made easy to judge the direction and amount to be used.

Therefore, the coordinates (x1, y1), (x2, y2) of point A and point B displayed on the respective display sections 10 and 11
The operator moves to the platform 1 in the direction approaching the planned position O, O.
can be moved to position the platform 1 at the planned position.

Next, A based on the above measurement distances 1, 2, and 3
The basic formulas for the coordinates (x1, y1) and (x2, y2) of point B will be described.

In the explanatory diagram of FIG. 3, the coordinates of point A and point B at the planned position of the boat platform 1 are (O, O),
(d ₁ , O), and the distance between A and C is 1, B,
The distance between C is 3, the distance between B and D is 2,
The distance between A and B is d1, the distance between C and D is d2, the perpendicular from point C is S, the intersection of S with the straight line connecting A and B is (P, O), and the point A and (P, O) The distance between P and B
D from the intersection of the perpendicular line from the point and the straight line connecting C and D
Let the distance to the point be g, the point c be (P, S), and the point D be (P+d2, S), and at the current position of the platform 1.
The coordinates at point A' and point B' are (x1, y1), (x
2, y2), and the distance between points A′ and C is ′1, B′,
Assuming that the distance between points C is '3, B' and the distance between points D is '2, and the angles formed by these are assumed as shown in the figure, the known numbers are d1, d2, S, P,
Since the 1, 2, 3 survey values are '1,'2,'3, the values to be found from this are the coordinates (x1, y1) and (x2, y2) of points A' and B'.

However, from the above known numbers and measured values, g=d1−d2−P ……(1) d1 ² =′1 ² +′3 ² −2′1′3cosθ′1 ……(2) d2 ² =′2 ² + ′3 ² −2′2′3cosθ′2 ……(3) ′2cosξ=′3cos(θ′2+ξ) ……(4) is obtained. Therefore, x2=′2sinξ−g……(5) y2=S−′2cosξ……(6). Also, cosΣ=P/1...(7) Λ=π/2-(Δ+β)...(8) Δ=π/2-(θ'2+ξ)...(9) α+β+Λ-θ=θ'1... (10) Therefore, x1=P′−′1cos(θ+Σ) ……(11) y1=S−′1sin(θ+Σ)……(12) From equations 5 and 6, the coordinates of point B′ ( x2, x2)
is obtained, and the coordinates (x1, y1) of point A' are obtained from equations 11 and 12.

Therefore, the above known numbers and the above general formulas (1)......(12)
If these are stored in the computer 7 on the platform 1, the measured quantities '1, '2, and '3 can be stored on the computer 7 at the site.
The current position of slipway 1 is
Calculated coordinates of points A′, B′ (x1, y1), (x
2, y2) is displayed on the display units 10 and 11, so that it can be easily known.

As explained above, according to the cradle positioning method according to the present invention, one operator is placed on each of the two light wave distance meters 3 and 4 placed on the cradle 1, and one of the operators is used to collimate one point on the reflector. However, on the other hand, it is very simple and easy to operate, as it is only necessary to aim at two points on the reflector and measure the distances '1,'2,'3 between the optical distance meter and the reflector. It is possible to save the labor of surveyors, and because distances in three directions are measured using two optical distance meters with high measurement accuracy, the resulting coordinate calculation of points A and B on the ship's platform is possible. The values can be obtained accurately, and the positioning of the ship's platform on vast oceans can be performed with high precision.In addition, positioning is possible because the only manual operation is to use the optical distance meter 3 and 4 to aim the reflector. Measurement and positioning for this purpose can be carried out quickly.

Therefore, after implementing the present invention, it is possible to carry out offshore work using a boat platform efficiently and with high precision.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the arrangement of measuring instruments in the present invention, FIG. 2 is a front view showing a display section in an embodiment of the boat positioning method according to the present invention, and FIG.
The figure is an explanatory diagram showing an embodiment of the method. Explanation of symbols, 1...Ship, 2...Reference position,
3, 4...Light wave distance meter, 5, 6...Reflector.

Claims (1)

[Claims] 1. In a device that determines the position of a ship's berth at sea by setting a reference line on land and installing reflectors at certain sections of the reference line, that is, at two points, a reference line is also provided on the ship's berth, A light wave distance meter is installed at each of two points in a certain area, and one light wave range meter is used to sight one point on the reflector, and the other light wave range meter is used to aim at two points on the reflector, and the respective distances, that is, land reflections are measured. Sight the reflector with the distance between the mirrors and the distance between the lightwave rangefinders and the lightwave rangefinder above, calculate the coordinates of the two points on the boat platform from the measured distances, and adjust the location of the boat by matching the coordinates with the planned values. A method for positioning a boat platform, characterized by setting it in a predetermined position.