JPS6128551B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a buoy having a resistance plate for reducing tilting of a specimen due to tidal currents or the like.

Display buoys or light buoys used for navigational aids or underwater construction are floating on the water.
It is moored with mooring lines to keep it in place.

When such a buoy has a current such as a tidal current, the buoy tilts due to the resistance of the water current hitting the buoyant body. In order to correct this inclination, we installed a marker column extending downwards on the bottom surface of the buoyant body, and at the bottom end there was a cross-shaped resistance plate (hereinafter referred to as a cross-shaped resistance plate) with wings of equal length that also served as a heavy peg. Attach a locking piece for locking the mooring line to the middle position of the target column where the resistance of the water hitting this resistance plate and the water resistance of the buoyant body are balanced, and the buoy I try to stay upright.

In this type of buoy, the locking piece was provided in the same direction as the blades of the cross-shaped resistance plate.

Even if such a buoy has good uprightness,
The buoy may rotate, causing the mooring line to become entangled with the resistance plate or the marker, the marker and the mooring line rubbing against each other and causing wear, or the mooring piece and the mooring line becoming severely worn. There was a problem.

Regarding this, as a result of field surveys and experiments, we found that when a cross-shaped resistance plate is allowed to rotate freely, the midway direction of the angle formed by the two blades should match the direction of the water flow. It was found that it was stable in some directions, but unstable in other directions.

Based on the above-mentioned characteristics of the cross-shaped resistance plate against water flow, the present invention provides a mechanism for rotating the buoy even in water flow by attaching a locking piece in the middle direction of the angle formed by the blades of the resistance plate. The purpose of this invention is to provide a buoy that prevents movement, does not cause entanglement of mooring lines, and does not cause accidents such as wear and tear of mooring parts, and has good uprightness with stable orientation of the buoy. Explain in detail.

In the drawings, FIGS. 1 to 3 are plan views of a cross-shaped resistance plate for explaining the principle, FIG. 5 is a front view of a buoy showing one embodiment, and FIG. 6 is a cross-sectional view taken along line C-C in FIG. 5. 4 is an enlarged sectional view taken along the line DD in FIG. 5.

First, to explain the principle of the present invention, the first
The figure shows a state in which the direction of the bisector of the angle formed by the cross-shaped resistance vanes AO and A'O coincides with the direction of the water flow indicated by the arrow.

Figure 2 shows that when the cross-shaped resistance plate rotates slightly clockwise, an angle of Θ ₁ is created between the direction of the bisector of the angle formed by the blades AO and A′O and the direction of the flow. Indicates when a difference occurs.

In this case, the water flow hits the blades AO and A′O, and dynamic pressure acts on it, but the flow is blocked by the blades AO and A′O, and almost the same pressure is applied to both blades. , rotational force is not generated much.

However, the water flow that bypasses the tips A and A′ of the blade becomes faster near the tips of A and A′, and the faster flow causes B′ to protrude from the projection plane of the blade AO on the blade B′O. A counterclockwise rotational force acts on the cruciform resistance plate to return it to the state shown in Fig. 1. In this case, the blade BO
is in the wake of the blade A′O, so no force is exerted on it. Therefore, in the case of polarization, there is a force that tends to return the state as a whole to the state shown in FIG.

Figure 3 shows the case where the blade AO swings slightly by Θ ₂ from the direction of the water flow indicated by the arrow.

In this case, the flow shown in the diagram hits the blade AO, and it acts like a rudder on a boat, with a force acting to turn the cross-shaped resistance plate counterclockwise.

Near the center of the blade A′O, there is a blade
The flow from the AO causes a flow along the blade OA′. Therefore, in blade A′O, resistance mainly acts between A′A″.

On the other hand, the gap between OB in the blade OB′ enters the wake of the blade AO, and resistance mainly acts between B′B.
Almost balanced with the resistance acting between A′A″, almost no rotational force acts between them.As a whole,
Due to the rotational force acting on the blade AO, the resistance plate rotates counterclockwise to the state shown in the first diagram.

In this way, when the cross-shaped resistance plate is free to rotate, the state of polarization shown in FIG. 1 is reached, and the resistance body is stably stationary. That is, the state shown in FIG. 1 is the most stable state of the cross-shaped resistance plate against water flow.

FIG. 4 shows a configuration of the present invention in which the mooring line locking piece attached to the middle of the marker pole body is oriented in a stable direction of the cross-shaped resistance plate with respect to the water flow.

That is, when attaching the mooring line locking piece to the marker pole body, the locking piece is oriented in the direction of the bisector of the angle formed by the adjacent blades of the cross-shaped resistance plate.

By doing this, when the mooring line locking piece is provided in the same direction as the blade of the cross-shaped resistance plate as in the conventional case, if the buoy swings even at a slight angle,
The resistance plate became unstable against the tidal current, and its vibration increased, making it more likely to cause rotational movement.

In addition, the locking point of the locking piece is separated by a distance e from the center of the marker pole body, and this acts as the arm length of the restoring moment, but it depends on the relationship between this arm length e and the speed of the water flow. If the mooring line matches its own rotation period, it resonates and causes a reciprocating rotational movement, causing the mooring line to become entangled with the resistance plate or marker body, or wear out due to rubbing against each other, or cause severe wear on the mooring part. had caused an accident. However, with the configuration of the present invention, the cross-shaped resistance plate stands still stably even in water flow, as described above, and the buoy stands still with the direction of the locking piece facing the direction of the current. do.

In addition, the arm length e of the locking piece acts as a restoring moment arm and helps stabilize the buoy, so even if the locking piece is installed slightly unbalanced, the buoy will not be shaken. The buoy can be kept stationary in a stable state in the direction of the current.

FIG. 5 shows one of the most effective applications of the invention.

In the figure, 1 is a floating body, 2 is a marker that projects above and below the floating body, 3 is a lamp attached to the top of the marker, and 4 is the lower end of the marker 2 below the floating body 1. It is a cross-shaped resistance plate attached to.

5 is located midway between the floating body 1 and the cross-shaped resistance plate 4,
A mooring rope locking piece attached to the marker body 2, as shown in FIGS. 6 and 4, and is attached in the direction of approximately the bisector of the crisscross angle formed by the blades of the cross-shaped resistance plate 4. .

6 is a mooring line. In the above, the light color of the lamp device 3 is different in the direction of the locking piece 5 and in the opposite direction. For example, the direction of the locking piece 5 is blue, and the opposite side is red.

In addition, the floating body 1 is used as a daylight marker by taking advantage of its large volume, and its surface is colored so that it can be easily recognized from a distance.
The color of the locking piece 5 matches the light color of the lamp device 3.
The half side in the direction of is painted blue, and the opposite side is painted red.

In this way, the blue color indicates the upstream side of the flow, and the red color indicates the downstream side, so if you make everyone aware of this color-coding relationship, you can see the buoys both day and night.
The direction of the current can be immediately identified.

With the configuration of the present invention, even if the buoy is in a place with rapid currents, the buoy will remain stable and stationary, and accordingly, the light equipment and the direction signs of the daytime marker will always point correctly upstream (blue) and downstream (red), so navigation will be easier. When a buoy is seen by a vessel, the direction of the current can be immediately identified, allowing safe navigation and helping to prevent maritime accidents.

Further, it is possible to provide a stable buoy with good directionality and excellent uprightness without rotational oscillation with respect to water flow. This buoy is suitable for places such as straits and canals where there is constant current and the direction of the flow changes over time.However, since the buoy always remains stable, the mooring line can be attached to a beacon or a cross-shaped resistance plate. This eliminates the possibility of entanglement, which eliminates the wear and tear accidents that previously occurred, and also greatly reduces the severe wear and tear caused by friction on the moorings, resulting in a long life and economical design. It has excellent features that can provide a good buoy.

[Brief explanation of the drawing]

1 to 3 are plan views of a cross-shaped resistance plate for explaining the principle, and FIG. 5 is a front view of a buoy showing an embodiment.
Figure 6 is a cross-sectional view taken along the line C-C in Figure 5, and Figure 4 is a cross-sectional view of Figure 5.
It is a sectional view taken along the line DD in the figure. 1 is a floating body, 2 is a marker body, 3 is a lamp, 4 is a cross-shaped resistance plate, 5 is a locking piece, and 6 is a mooring rope.

Claims (1)

[Scope of Claims] 1. A marker column is installed below the center of the lower surface of the buoyant body, a cross-shaped resistance plate of equal length is provided at the lower end of the marker column, and it is moored between the resistance plate and the lower surface of the buoyant body. In a floating buoy equipped with a cable locking piece, the direction of the locking piece is determined by the angle 2 between the adjacent blades of the cross-shaped resistance plate and the blade.
A buoy characterized by being oriented in the direction of equal division. 2. A mooring cable locking piece is provided in the direction that bisects the angle between the adjacent blades of the cross-shaped resistance plate of equal length,
The buoy according to claim 1, wherein the lamp light or the daytime sign is colored differently in the front and rear directions of the locking piece.