JPS60219191A - Single point mooring device - Google Patents

Abstract

PURPOSE:To absorb pitching and rolling of moored vessel and pitching of buoy by coupling one end of yoke having the other end coupled rotatably around a bouy rotatably to an arm journaled rollably to the hull while having a weight at one end. CONSTITUTION:Yokes 3, 5 are coupled such that one ends are rotatable through bearings 4 around a buoy 1. The yokes 3, 5 are rotatable around axes through the bearings 6. An arm 7 is journaled 10 rollably to a moored vessel 12 where a weight 11 is provided at one end while the other end is coupled rotatably to the yoke 5. An opening for making the arm 7 and the weight 11 rollable is made through said vessel 12. When constructing a weight mechanism in the yoke 3, 5 through the arm 7, pitching, rolling of moored vessel and pitching of buoy can be absorbed effectively.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a single point mooring device using a yoke.

(Prior Art) Figures 4 and 5 show conventional single-point mooring devices, in which 1a is a buoy, 2a is a yoke, 3a is a tanker,
4a is a roller bearing, 5a is a bottle, 6a is an anchor chain, and 7a is an oil transport pipe.

This device is a mooring facility that allows a tanker or purge to be moored offshore for a long period of time in order to temporarily store crude oil extracted from an offshore oil field.

In this device, a tanker 3a is moored to a buoy 1a by a rigid yoke 2a, and the buoy 1a is moored by a plurality of chains 6a and anchors. One end of the yoke 2a is connected to the tanker 3a by a bottle structure, and the yoke 2a is rotatable in the vertical direction around the pin 5a. On the other hand, the other end is a buoy 1a and a roller bearing 4a.
The center 6 of the buoy 1a is rotatable around the vertical axis.

However, in the conventional single-point mooring device using a yoke, since the yoke is a rigid body, there is no degree of freedom, and the mooring force generated on the device due to the surrounding environment such as waves is large9, and the strength of each part is adjusted accordingly. needed to be sufficient.

(Problems to be Solved by the Invention) In view of the above, the present invention is proposed for the purpose of reducing the mooring force applied to a single-point mooring device.

(Means for Solving the Problem) The one-point mooring device according to the present invention includes a yoke whose one end is rotatably connected to a rotary shaft of a buoy via a bearing, and an arm having a weight at one end. The main feature is that a substantially central portion of the arm is rotatably supported on a moored ship, and the other end of the yoke and the other end of the arm are rotatably connected to each other by a shaft. .

(Function) In the single-point mooring device according to the present invention, when an external force is applied to the moored boat due to the surrounding environment such as waves, the moored boat moves from the moored position and tries to sway, but the yoke does not allow the moored boat to sway. Since it is pivotally connected to a rotatably supported arm, the pitching of the buoy and the moored vessel due to the external force is absorbed.

Furthermore, in response to external forces that try to move the buoy and moored boat toward or away from each other, the distance between the buoy and the moored boat expands and contracts due to the lifting and lowering of the weight, that is, the pendulum motion of the arm. The result will be the same as doing so, and those external forces will be absorbed.

(Example) The present invention will be described below based on an example shown in FIGS. 1 to 3.

In the figure, 1 is a buoy, 2 is an anchor chain and anchor, 3 is a floating body side yoke, 4 is a bearing, and 5 is a purge body
6 is a bearing, 7 is an arm, 8 is a bearing, 9 is a column, 10
11 is a bearing, 11 is a weight, and 12 is a purge or tanker.

Buoy 1 is moored by a plurality of anchor chains and anchors 2. One end of the floating body side yoke 3 is attached to the buoy 1
It is rotatable by a bearing 4 about a vertical axis passing through the center of. One end of the purge-side yoke 5 is connected to the other end of the floating body-side yaw 3 via a bearing 6, and is mutually rotatable about the axial direction of the yoke. A pair of columns 9 fixed on one end of the purge 12 supports a certain point of the intermediate portion of the arm 7 via a bearing 10. The arm 7 is therefore rotatable relative to the column 9. One end of the arm 7 is connected to the other end of the purge side yoke 5 via a bearing 8 so that they can rotate together.
1 is installed. Therefore, when the purge or tanker 12 attempts to move away from the buoy 1, as shown in FIG. An opening 14 is provided at one end of the purge 12 around which the zero weight 11 that is about to rise rotates, so that the rotation of the weight 11 cannot be prevented. This weight mechanism consists of a weight that can accommodate the maximum load generated on the mooring device and a lever of the arm 7.

Therefore, in addition to a single point mooring system consisting of the above-mentioned components and functions, purge or tanker 12
When an external force is applied, the purge or tanker 12 tends to move from its mooring position and oscillates. Since the moored purge or tanker 12 is connected to the buoy 1 via the yoke, the buoy 1 moves until the tension generated in the anchor chain 2 and the external force due to the external force acting on the purge or tanker 12 are balanced. . On the other hand, when an external force acts on the purge or tanker 12, the weight mechanism at one end of the yoke lifts the weight 11 to a point that balances the external force, so the distance between the floating body 1 and the purge or tanker 12 increases, and when the external force disappears, , since the downward distance of the weight becomes shorter, the result is the same as that of the yoke expanding and contracting.

The bearing 6 between the floating body side yoke 3 and the purge side yoke 5 absorbs the rolling that occurs in the buoy 1 and the purge or tanker 12 without transmitting it to each other. A bearing 8 at the other end of the purge side yoke 5 absorbs pitching of the buoy 1 and the purge or tanker 12. The back and forth rocking of the purge or tanker 12 is absorbed by the weight mechanism. Further, the whirling of the bulge or tanker 12 is absorbed by the bearing 4 between the buoy 1 and one end of the floating body side yoke 3.

In addition, when applying the present invention to the deep sea, the buoy and the plurality of anchor chains and anchors in the above embodiment can be replaced with an oblong pillow-shaped buoy and a pile or tower and pile that fixes it to the seabed. good.

(Effects of the Invention) As described above, according to the present invention, 1) By providing the yoke with a weight mechanism, elasticity of the yoke itself, which could not be obtained with conventional yoke mechanisms, can be obtained, which reduces the It is possible to reduce the amount of external force applied.

By providing a weight mechanism on the second yoke, it is possible to absorb the pitching (pitching) of a moored vessel such as a purge or tanker, the back and forth rocking, and the pitching of a buoy.

Therefore, the required mooring force is smaller than conventional ones,
The strength of each part of the device can be kept to the minimum necessary, and the manufacturing cost of the device is reduced.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the present invention,
1 and 2 are side views, and FIG. 3 is a plan view. FIG. 4 is a side view of the conventional device, and FIG. 5 is a plan view thereof. 1... Buoy, 4... Bearing, 3, 5... Yoke, 7...
・Arm, 11... Weight.

Claims (1)

[Claims] It is equipped with a yoke whose one end is rotatably connected around the buoy via a bearing, and an arm with a weight at one end, and the arm is pivotally supported approximately in the center on a moored ship so as to be able to swing. , and a single point mooring device characterized in that the other end of the yoke and the other end of the arm 9 are mutually rotatably connected by a shaft.