JPH0958575A - Three-point catenary mooring device for buoy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a three-point catenary mooring device for a buoy to keep the advantage of a three-point intermediate floating body catenary mooring device, better a defect, such as water bottom contact wear of a mooring cable and intertwinement of a fishing bank, and reduce the occurrence of whirling, and be stable. SOLUTION: The terminal of a mooring cable 2 for a buoy is connected to the mooring ring 6 for a buoy of a column body 3 with a floating body pulled in water by a sinker 9 sunk on a sea bottom at each of mooring three points.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a three-point catenary mooring device for mooring a buoy.

[0002]

2. Description of the Related Art (1) One-point catenary mooring device (see FIG. 7) (2) One-point intermediate floating catenary mooring device (see FIG. 8) (3) Three-point catenary mooring device Device (see FIG. 9) (4) There is a three-point intermediate floating body catenary mooring device (see FIG. 10).

The one-point catenary mooring device of (1) is generally used as a mooring device although it has a drawback that the water bottom contact portion of the mooring line is largely worn and the buoy swings around greatly.

In the one-point intermediate floating body catenary mooring device of (2), the bottom mooring line has no contact with the bottom of the water, and there is little fear of wear, but the buoy swings around greatly and the upper mooring line may entangle with the intermediate floating body. Yes Used for special purposes.

In the three-point catenary mooring device of (3), whirling of the buoy can be reduced, but the weight of the mooring line is large.
It is necessary to increase the buoyancy of the buoy, and the water bottom contact part of the mooring line is heavily worn.

In the three-point intermediate floating body catenary mooring device of (4), the intermediate floating body supports the weight of the mooring line, the buoy buoyancy can be reduced and the size can be reduced, the water bottom contact portion of the mooring line can be reduced, and the abrasion can be reduced.
There are few swings around the buoy.

[0007]

However, the lower mooring line becomes a catenary, and it is easy for entanglement to the roots of fish reefs, etc. Especially when there is a water bottom slope, there is water bottom contact near the sinker of the mooring line. (See FIG. 11) Abrasion and root entanglement are more likely to occur. In addition, the intermediate floating body makes an elliptical motion due to waves, and when the vertical oscillation period and the change in the catenary amount of the lower mooring line and the mooring line expansion and contraction natural period due to the tension of the intermediate floating body become close to each other, resonance occurs and May adversely affect function. The present invention is a stable three-point catenary mooring device for buoys, which retains the advantages of the three-point intermediate floating catenary mooring device, improves the above-mentioned drawbacks, and has less swinging.

[0008]

In order to achieve this object, in the present invention, in a three-point catenary mooring device for a buoy, which is moored to three points on the bottom of the water by using three mooring lines, each mooring point is three points. , A sinker sinking on the bottom of the water, a buoyant body at the top of the column, a buoy mooring ring at the top of the column, and a mooring ring for the sinker at the lower end of the column, and the mooring tool pulls the mooring ring to moor it, which results in buoyancy. A three-point catenary mooring device for buoys, which consists of a column with a buoyant body so that the body is completely submerged in water, and each terminal of three mooring lines for a buoy is moored to a mooring ring for a buoy at the top of the column. .

In the above three-point catenary mooring device for buoys, when the water area where the buoy is installed is a sloping land, the length of the pillars is adjusted by the inclination so that the water depth of the buoy mooring ring at the top of each pillar is the same. It is a three-point catenary mooring device for buoys.

[0010]

Function: The column with buoyancy body installed at 3 points of mooring stands upright by buoyancy, but since the buoy is moored, the weight of the mooring rope for buoys causes mooring force on the mooring ring for buoys in the axial direction of the catenary. Acting, the column with buoyancy body leans toward the buoy, but at an inclination angle that balances the restoring force and the mooring force.
Attempts to separate by an external force such as wind and water flow, but when an external force acts on the buoy direction of one mooring line, the separation length of the mooring line and the inclination of the column with buoyancy body become maximum, The maximum separation (see Fig. 5) occurs, and the slack of the mooring line becomes maximum when the external force acts in the sinking direction of one mooring line, and the inclination of the column with buoyancy body becomes minimum, and the maximum separation in that direction occurs. Out (see FIG. 6). The maximum swing range of the buoy is 1 in Figure 2
It becomes like a dotted chain line (an arc centered on each sinker and having a radius of the maximum separation distance in FIG. 5).

Since the column with the buoyancy body is movably tilted to the sinker by a short mooring tool, swaying around the mooring point may occur due to buoyancy, but the swaying cycle (15 to 30 seconds).
Does not resonate much differently from the wave cycle (6 to 12 seconds), and because the swaying resistance of the column with buoyancy body is large,
No upset. Therefore, the column with a buoyancy body changes the inclination angle of the column with a buoyancy body to some extent according to the buoy departure direction by the external force acting on the buoy, but there is no shaking and it is stable. It will be raised to the position. Further, the column body with the buoyant body absorbs the impact force due to the external force applied to the mooring line for the buoy by its inclination restoring force, and greatly relieves the mooring force acting on the mooring line. In addition, even if the mooring ring for buoys acts on the buoy mooring ring due to the restoring force of the column with a buoyant body, the tilt is suppressed by the restoring force even when the column body tilts. Since it is provided below the body, the restoring force of the buoyancy body is increased and the inclination is further reduced, so that the buoys are separated from the conventional three-point intermediate floating body catenary mooring device even further.

When the water bottom is a sloping ground, the mooring device for buoys is used in which the length of the pillars is adjusted according to the water depths of the three mooring points and the water depth of the mooring rings for buoys at the top of each pillar is the same. As a result, it is in a state of being horizontally raised to the position of the mooring ring for the buoy at the upper part of the column, and the same operation as described above is achieved.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view of a three-point catenary mooring device for buoys embodying the present invention, and FIG. 2 is a plan view thereof. 1 in the figure
Is a buoy, 2 is a mooring line, and a chain or wire rope is used. 3 is a column with a buoyancy body, 4 is a buoyancy body, 5 is a column body, 6 is a mooring ring for buoys, 7 is a mooring ring for sinkers, and 8 is a mooring tool such as a shackle, swivel or open ring. , 9 are sinkers, which are made of concrete.

FIG. 3 is a front view of the column body 3 with a buoyant body. The column 5 is a steel pipe, and the buoyant body 4 is a steel plate hollow float. Reference numeral 10 is a construction suspension ring, 11 is an anticorrosion plate, and 12 is a flange joint. By providing the mooring ring 6 for the buoy on the upper part of the column below the buoyancy body, the restoring force acting on the mooring line by the buoyancy body is increased by the arm difference of the action point, so that the buoyancy body can be made small and the mooring line There is no entanglement or entanglement with the buoyancy body.

FIG. 4 is a front view of an embodiment of the present invention when the water bottom is a sloping ground. The two-dot chain line shows the state where the external force acts in the direction of the arrow and the buoy is closest to the sinking weight. Although the length of the pillar differs depending on the inclination of the water bottom, the water depth of each mooring ring 6 for buoys is the same and the length of each mooring line 2 is the same. FIG. 5 is A- of FIG.
A view shows a state where the external force acts along one mooring line in the direction of the arrow and is most separated, and FIG. 6 is a similar view in which the external force is along one mooring line and the direction of the sinking weight (direction of the arrow). ) Of the mooring line that is closest to the sinker, and even when the buoy comes to the lowest point of the wave at low tide, even if the mooring line is the most slack, the length of the mooring line that does not catch roots such as fish reefs on the bottom of the water Set to. FIG.
Even if the bottom of the water is sloping, the two-dot chain line is set to the length of the mooring line where the mooring line is the most slack and the root of the bottom of the water does not get caught.

FIGS. 7 to 11 are explanatory views of a conventional floating buoy catenary mooring device, FIG. 7 is a one-point catenary mooring device, FIG. 8 is a one-point intermediate floating catenary mooring device, and FIG.
Is a front view of the three-point catenary mooring device, FIG. 10 is a front view of the three-point intermediate floating catenary mooring device, and FIG. 11 is an explanatory diagram showing the front of the three-point intermediate floating catenary mooring device on a sloping ground. The two-dot chain line in each figure shows the state of being separated by an external force in the direction of the arrow, and shows the state of the mooring line in each case.

[0017]

When the three-point catenary mooring device for a buoy according to claim 1 is used, the bottom of the water is raised to the position of the mooring ring for the buoy at the upper part of the column, and the same effect as if the water depth becomes shallower is obtained. The mooring lines are simplified and easy to design. Part of the weight of the mooring line is supported by the column with a buoyancy body, and the shocking mooring force due to the external force applied to the buoy is mitigated by the tilting of the column, and the stress applied to the mooring line is reduced compared to the conventional example. The cross-sectional size of the rope can be reduced, the weight of the mooring rope can be reduced, the buoyancy of the buoy can be reduced accordingly, the buoy can be made smaller, and the external force such as waves applied to the buoy can be further reduced, and the entire apparatus becomes economical. In addition, there is no fear of vibration of the column with buoyancy body, there is little sway, there is little wear on the mooring line, there is no adverse effect of the mooring line on the buoy, and it is suitable for mooring buoys with precision equipment such as observation buoys. A suitable device. In the conventional mooring method, a feeding buoy can be moored on a group of fish reefs that form the root of mooring lines, and it is an optimal mooring device for feeding fish there.

With the buoy mooring device according to the second aspect of the present invention, even when the buoy mooring device is installed on an inclined water bottom, the water bottom is horizontally raised to the position of the buoy mooring ring at the upper part of the pillar so that the water depth is shallow and flat. The same effect as described above is obtained, and the same effect as described above is obtained.

In any of the above cases, a floating mooring device for buoys has the least buoy departure and is a stable mooring device with little shaking, and the buoys are free from the adverse effects of mooring lines. It is a catenary mooring device for buoys that can be installed without problems even on cliffs and sloping lands, and has little wear with the water bottom and wear of the connecting tool. Further, since the column with the buoyancy body is hardly swayed and the mooring tool is not worn, maintenance and inspection can be performed only with the mooring line above the mooring ring for the buoy at the upper part of the column for easy diving work. In addition, since the buoyant body is located at a sufficient depth, the buoyant body and mooring lines do not hinder the navigation of the vessel.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a front view of a column with a floating body.

FIG. 4 is a front view showing an embodiment of the present invention when the water bottom is a sloping ground.

5 is a diagram showing a state in which an external force acts and separates in the direction of the arrow in the AA view of FIG. 2. FIG.

FIG. 6 is a diagram showing a state where an external force acts in the direction of the arrow in FIG.

FIG. 7 is an explanatory diagram of a one-point catenary mooring device.

FIG. 8 is an explanatory diagram of a one-point intermediate floating body catenary mooring device.

FIG. 9 is an explanatory view of a conventional three-point catenary mooring device.

FIG. 10 is an explanatory diagram of a conventional three-point intermediate floating body catenary mooring device.

FIG. 11 is an explanatory diagram of a conventional three-point intermediate floating body catenary mooring device having a sloping water bottom.

[Explanation of symbols]

 1 buoy 2 mooring line 3 column with buoyancy body 4 buoyancy body 5 column 6 mooring ring for buoy 7 mooring ring for sinking weight 8 mooring tool 9 sinking weight 10 suspension ring for construction 11 anticorrosion plate 12 flange 13 fish reef 14 intermediate floating body

Claims (2)

[Claims] 1. A three-point catenary mooring device for buoys that uses three mooring lines to moor at three points on the bottom of the water. At each of the three points of mooring, a sinker sunk on the bottom of the water and a buoyancy on the top of the column. It has a buoy mooring ring at the top of the body and the pillar, and a sinking mooring ring at the lower end of the pillar, and it is pulled into the sinker by a mooring tool and moored so that the buoyant body is completely submerged. In addition, a three-point catenary mooring device for buoys, characterized in that each of the terminals of the three mooring lines for buoys is connected to the mooring ring for buoys at the top of each column. 2. The three-point catenary mooring device for buoys according to claim 1, wherein the length of the columns is adjusted by the inclination of the water bottom, and the water depth of the mooring rings for buoys at the top of each column is made the same. 3 point catenary mooring equipment for buoys.