JPS5913682B2 - Ship positioning method for offshore civil engineering work - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for positioning a ship's platform when performing civil engineering work while securing a fixed position at sea.

As part of civil engineering work to improve the soft ground in coastal areas, a construction method has been developed and implemented in which hardening material is injected into the soft soil beneath the ocean floor and kneaded to create hardened continuous walls.

In this construction method, it is necessary to accurately determine the position of the platform on which the kneading processing machine is mounted in order to provide continuity, directionality, etc. to the wall.

Conventionally, in order to position the berth at sea, a reference stand is installed near the work area, distance and direction are measured from this reference stand using a tape measure or transit, and these measurement results are communicated to the helm of the berth via radio. A method using gyros, magnets, etc. used for navigation was used.

However, this method has the following problems.

(1) Tape measures need to be corrected for tension and temperature.

(2) The measurement distance range on the sea is limited to 50 to 60 m.

(3) Radio communication from the reference platform to the boat platform is required.

(4) Multiple measurement personnel are required. Therefore, the present invention
This was done as a result of consideration in view of the above-mentioned conventional circumstances, and its purpose was to enable a single person to more accurately determine the position of the berth using extremely simple equipment. The gist of this is that the light projected from the light wave rangefinder on the ship's platform is reflected by the reflector at the reference position to measure the distance from the reference position to the ship's stand, and the light is emitted from the same point as the light wave rangefinder. The emitting laser emitting device is swung at a pre-calculated angle, then the laser emitting device is switched to visual observation, and the position is determined by moving the platform in a direction that allows viewing of the reflector at the reference position and the pole at an arbitrary distance. After that, the torsion angle is measured by projecting a laser beam onto a laser light receiving device installed in a spaced relationship with the laser emitting device so that the direction of the boat platform can be set in advance, and the torsion is corrected based on the measured value.

Hereinafter, the present invention will be described in detail based on one embodiment shown in the drawings. In FIG. Set up the measurement target.

On the boat platform 4, for example, a light wave distance meter 5 and a laser emitting device 6 are installed at the same point at the stern, and a laser light receiving device 14 is installed at the bow.

Further, the laser light receiving device 14 can be used for example when the reflecting plate 2 is set as a point a, the pole 3 is set as a point, and the light wave distance meter 5 and the laser emitting device 6 are set as a point C, a straight line connecting points a and b. , a straight line connecting points C and C is installed at an arbitrary distance t2 on the straight line connecting points C and C, and is spaced apart from and facing the optical distance meter 5 and the laser emitting device 6, as shown in FIG. , the laser light receiving device 14 is arranged at right angles to the straight line g connecting the bow and stern.

Furthermore, the laser emitting device 6 is provided so as to be able to switch between laser beam emission and visual viewing, and a third
As illustrated in FIG. 4, the optical distance meter 5 is rotatably supported by an axis perpendicular to the optical axis, and the optical axis d is set at an arbitrary angle with respect to the optical axis e of the optical distance meter 5. It is now possible to take.

As shown in FIG. 5, a control box 7 equipped with a start button, a set button, etc. (not shown), which can be operated while looking into the light wave range meter 5, is installed next to the light wave range meter 5. A light intensity meter 8 for detecting the amount of light 9' projected onto the light wave distance meter 5 is installed on the upper surface of the light wave distance meter 5.

The light wave distance meter 5, control box 7, and light intensity meter 8 are connected to a distance meter 10, and the distance meter 10 is connected to a power supply box 11 and, if necessary, a digital printer 12 and a digital display device 13.

Note that this optical distance meter 5 is a commercially available one.
The principle is that, for example, light is emitted from a light wave distance meter 5 with two wavelengths, long and short, and reflected by a light wave reflector 2. At this time, the light 9 projected onto the reflector 2 and the light reflected by the reflector 2 The distance is measured by converting the time difference between the light 9' and the light 9' which enters the light wave distance meter 5 into an electric signal as a time difference.

Since the present invention is implemented using the above-mentioned equipment,
In Figure 1, if we consider the case where there is a boat 4 at point C'7 on the sea and we want to position it at point 0, first we project a light wave from the light range meter 5 to the reflector 2 at the reference position, and the light wave is reflected. The distance between points a and c"7 is measured as described above using the light reflected from the plate 2 and projected onto the light wave distance meter.

In the figure, the distance from point a to C"' is considerably farther than the distance t3 from point a to positioning set point C, so
At this time, the distance t3 is measured while moving the pedestal 4, and the pedestal 4 is moved to, for example, c.

As a result, the distance t3' of the boat platform 4 from the reflecting plate 2 becomes equal to the distance t3 at the set position.

Next, point a at the pre-calculated set position C point.

The angle α between C and points c and b is set by the laser emitting device 6 at seven points C, and the angle α between points a and c and points c and b is taken.

(α=α') At this time, the laser emitting device 6 is switched from laser emission to visual viewing, and the pole 3 is viewed.

In this way, when there is a distance difference between point C and point C' as shown in the figure, a difference X occurs between the eye viewpoint f and the pole 30 point.

However, by setting X to O, the platform 4 can be positioned at point 0, so while maintaining the distance t3' from point 07 to the reflector 2, move the platform 4 in the direction where the above-mentioned X becomes smaller, for example. The point C' indicated by the two-dot broken line in the figure is moved in the force direction while bringing X closer to 0, and the point where X finally becomes 0 is the position of point C, and the platform 4 is at the set position point C. It is reached.

Next, at point C, the boat platform 4 moves, for example, as shown in FIG.
In some cases, the point b of the pole 3 is not on the extension of the straight line g connecting the center points of the bow and stern of the boat platform 4 according to the set orientation, resulting in a twist at an angle θ.

At this time, the laser light emitting device 6 is switched from visual observation to laser beam projection and is swung by a set angle α to irradiate the laser light receiving section 14 with the laser beam.

Therefore, if the distance between the laser emitting device 6 and the laser receiving device 14 is t2 for the torsion θ of the boat platform 4, then X'=12s
A difference in X' values occurs, indicated by inθ.

Therefore, by setting this X' value to O, that is, by rotating the landing of the pedestal 4 around the 0 point so that the angle θ is zero, the twisting of the pedestal 4 is eliminated and the direction of the pedestal 4 can be corrected. It will be done.

Thereafter, the pontoon 4 is positioned on the sea using an anchor wire or the like.

As explained above, according to the cradle positioning method according to the present invention, the distance t3 from the reflector 2 at the reference position is measured by the light wave distance meter 5 installed on the cradle 4, and the cradle 4 is moved to that distance. At that point, the laser emitting device 6, which is on the same point as the light wave distance meter 5, is swung by a pre-calculated setting angle α, and then the laser emitting device is switched to visual observation to set it at an arbitrary distance from the reflector 2 at the reference position. By moving the boat platform 4 in the direction in which the installed pole 3 is visible, the boat platform 4 can be positioned at a set position, and at the positioning point, the laser light emitting device 6 is connected to the laser light receiving device 14 that is spaced apart from each other. By irradiating light from
Since the direction can be corrected by rotating the platform in the direction that makes the intersection value O with the set direction, such a simple operation can be used to It is possible to measure the position and direction of the ship's platform by a single person, except for the light wave rangefinder and the laser emitting device, without requiring regular personnel. Therefore, the light wave rangefinder and the laser emitting device are installed in the wheelhouse. Then, the above-mentioned measurement and positioning of the boat platform can be easily performed by one person, and even the direction can be corrected, so that the positioning can be performed accurately and with high precision.

[Brief explanation of drawings]

FIG. 1 is an overall plan view showing a specific example of a method for positioning a boat platform according to the present invention. FIG. 2 is a plan view showing a specific example of measuring the torsion of a boat platform using the same method. FIG. 3 and FIG. 4 are a plan view and a surface diagram showing a light wave distance meter and a laser emitting device used in the method. FIG. 5 is an explanatory diagram when measuring and digitally displaying the distance from the base position to the boat platform in the same method. Brief explanation of symbols 1...Reference position, 2...Reflector, 3...Pole, 4...Ship, 5...Light wave distance meter, 6...Laser emitting device, t3...・Positioning distance from the reflector to the boat platform, α...Angle between points a, e, c, and b, θ...Twist angle of the boat platform, 14...Laser light receiving device.

Claims (1)

[Claims] 1. Install a reflector, a pole, etc. at an arbitrary distance from the reference position, and install a light wave distance meter and a laser emitting device that can switch between laser emission and visual observation at the same point on the ship's platform. The distance from the reference position to the ship's platform is measured by reflecting the light projected from the reflector on a reflector, and the laser emitting device is swung at a pre-calculated angle with respect to the optical axis, and then the laser emitting device is switched to visual viewing. The position is determined by moving the platform in the direction in which the pole is viewed, and then the laser beam is
The torsion angle is measured by projecting the beam onto a laser receiving device installed at a distance from the laser emitting device so that the direction of the boat platform can be set in advance.
A method for positioning a ship's platform in marine civil engineering work, which is characterized by correcting torsion based on the measured values.