JPH0511116Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a single point mooring device.

[Conventional technology]

Crude oil is produced on the ocean floor, which is far away from land.
In many cases, oil is temporarily stored on an oil storage barge (hereinafter referred to as a barge) moored offshore, and then transferred to a tanker and transported to land.

In order to safely moor this type of barge in harsh environments such as wind, waves, and currents, conventional methods have been used to moor it to the seabed A with multiple anchor chains B, as shown in the side view in Figure 3 and the plan view in Figure 4. A guide rod protruding from the tip of a yoke G whose base end is pivotally supported on the barge F is loosely inserted into a through hole in a connecting part D protruding from the top of the stopped buoy C, and then connected to a pair of front and rear stoppers. One-point mooring devices are known in which the mooring device is fixed to the connecting portion D at E.

However, such a structure has the following drawbacks.

(1) Since buoy C and barge F are connected using a rigid yoke G with no margin at all in the front-back direction, the upper connecting part D of buoy C
An extremely large force acts on the connecting portion D, which poses a problem in designing the strength of the connecting portion D.

(2) When barge F is urgently evacuated from the moored area under severe weather and sea conditions, it is necessary to remove the stopper E that connects the connecting part D of yoke G and buoy C. Such work is not easy and involves considerable risks.

[Problem that the invention attempts to solve]

The present invention was proposed in view of these circumstances, and is a single-point mooring device that does not apply excessive force to the connection between the yoke and the buoy and can safely and easily disconnect the barge from the buoy. The purpose is to provide.

[Means for solving problems]

To this end, the present invention provides a one-point mooring device in which the tip of a mooring yoke protruding from a moored hull is anchored to a connecting portion protruding from the turntable at the upper end of the mooring buoy. A pair of left and right mooring cables connected to the moored hull at a distance apart, a relatively long guide rod that projects from the tip of the mooring yoke in its longitudinal direction, and the guide rod that projects from the pivot of the turntable. The present invention is characterized by comprising a guide rod support member having a substantially horizontal through hole into which the guide rod is loosely inserted from its tip over its entire length, and a buffer member fitted to the guide rod near the yoke.

[Effect]

With the above configuration, it is possible to obtain a one-point mooring device that can safely and easily disconnect the barge from the buoy without applying excessive force to the connection between the yoke and the buoy.

〔Example〕

An embodiment of the present invention will be explained with reference to the drawings.
FIG. 1 is a side view thereof, and FIG. 2 is a plan view of FIG. 1.

In the above figure, the same symbols as in Figs. 3 and 4 indicate the same members as in the same figure, and 1 is a hawser for mooring barge F to buoy C. Hawser 1 is a hawser for mooring barge F to buoy C. upper turntable C
It consists of a pair of left and right hawser cables connecting 1.

1a is a pair of left and right hawser locking fittings each provided at the front of the barge F for attaching and detaching the hawser; 2;
a is a guide rod protruding from the front end of the yoke 2 in the longitudinal direction of the yoke 2 in order to prevent the barge F from colliding with the buoy C; the guide rod 2a has a length that exceeds the maximum extension position of the hawser 1; At the same time, it is supported by being slidably inserted into a substantially horizontal hole in a guide rod support member 3 which is provided on the upper part of the buoy C and protrudes on the axis of the turntable C1. .

2b is a buffer material for preventing the yoke 2 from violently colliding with the guide rod support member 3; the buffer material 2b
is attached to the end surface of the guide rod support member 3 on the yoke 2 side.

In such a device, first, when barge F is affected by relatively large waves, wind, and tidal currents and a retreating force is applied, barge F is moored to mooring buoy C by hawser 1. , barge F is always rocking back and forth in the direction of wave travel, that is, around its average position, which is drifted downwind.
Therefore, the force based on the back and forth rocking of the barge F does not directly act on the upper part of the buoy C via the rigid member.

In addition, when the barge F is almost unaffected by waves, wind, and tidal currents and is occasionally given a small forward force, when the barge F moves toward the buoy C, the guide rod 2a is moved from the guide rod support member. After sliding along the through hole 3, the buffer material 2b comes into contact with the guide rod support member 3, so the force based on the back and forth rocking of the barge F does not directly act on the upper part of the buoy C via the rigid member. .

Furthermore, when the weather or sea conditions become severe and barge F needs to be evacuated from the moored water area in an emergency, barge F can be removed from hawser 1 using hawser locking fitting 1a, and barge F will be protected from the retreating force caused by waves, wind, and currents. The barge F can be moved away from the buoy C because the barge F moves backward and the guide bar 2a of the yoke 2 comes out of the guide bar support member 3.

According to such a device, the following effects can be achieved.

(1) Even if the barge swings back and forth, its influence does not directly act on the top of the buoy, so the design strength of the buoy connection can be lowered.

(2) The barge can be moved away from the buoy without having to transfer workers onto the buoy, improving work safety.

[Effect of idea]

In short, according to the present invention, in a single point mooring device in which the tip of a mooring yoke protruding from a moored hull is anchored to a connecting portion protruding from the turntable at the upper end of a mooring buoy, the turntable is a pair of left and right mooring cables connected to the moored hull at an appropriate distance; a relatively long guide bar protruding from the tip of the mooring yoke in the longitudinal direction; and a guide bar protruding from the pivot of the turntable. By providing a guide rod support member having a substantially horizontal through hole into which the rod is loosely inserted over its entire length from the tip, and a buffer member fitted to the guide rod near the yoke, the yoke and The present invention is extremely useful industrially because it provides a single point mooring device that can safely and easily disconnect the barge from the buoy without applying excessive force to the connection between the barge and the buoy.

[Brief explanation of the drawing]

Figure 1 is a side view showing one embodiment of the present invention;
The figure is a plan view of FIG. 1, FIG. 3 is a side view of a known single point mooring device, and FIG. 4 is a plan view of FIG. 3. 1...Hawser, 1a...Hawser locking fitting,
2... Yoke, 2a... Guide rod, 2b... Cushioning material, 3... Guide rod support member, A... Seabed, B...
...anchor chain, C...buoy, C1...turntable,
F... Oil storage barge.

Claims (1)

[Scope of utility model registration request] In a single point mooring device, the tip of a mooring yoke protruding from the moored hull is anchored to a connecting part protruding from the turntable at the upper end of the mooring buoy. A pair of left and right mooring cables connected to the ship's hull, a relatively long guide rod protruding from the tip of the mooring yoke in its longitudinal direction, and a relatively long guide rod protruding from the tip of the turntable along its entire length from the tip. A one-point mooring device comprising: a guide rod support member having a substantially horizontal through hole that is loosely inserted across the guide rod; and a buffer member fitted on the guide rod closer to the yoke.