JPS5975889A - Mooring system - Google Patents

Abstract

PURPOSE:To moor safely and reliably through simple structure, by providing a receiving section contacting against the inner wall face of recess upon deformation of roll in a resilient elevatable roll supporting frame coupled to a float on the water surface in the recess at the end of a floating structure. CONSTITUTION:A resilient roll 10 to be engaged with inner wall face 9 of a recess 8 formed in up/down direction at the end of a floating structure to guide relative up/down motion of said structure is supported through a supporting frame 11. A float on the surface of water in the recess 8 is coupled to the lower section of said frame 11 which is coupled to the end of a mooring rope 14 anchored to land side. A receiving section 11a contactable upon deformation of said roll 10 is formed at the inner wall face 9 side of the recess 8 of said frame 11. Said roll 10 will follow to ebb and flow of the tide and wave to enable mooring work safely and reliably without producing excessive surface pressure onto said roll 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for mooring a floating structure on water, such as an offshore petroleum storage tank, via a mooring line (including a mooring chain and a mooring rod).

In general, for a single mooring such as an offshore storage tank, the amount of change in draft is large, and because several tanks are installed close to each other in parallel, it is difficult to maintain a large distance between the mooring hardware and the mooring post. For these reasons, efficient mooring means have not been established.

For example, if the tank is floating and the position of the mooring hardware on the tank is higher than the mooring hardware on the mooring column, only the horizontal component of the tension of the mooring line connecting the two will be used for mooring. In addition to reducing efficiency, the tension direction also changes, making the root stop structure complicated.
In cases where it is necessary to maintain a constant distance between the tank and the mooring pole, the length of the mooring rope must also be varied according to the draft, and the maximum tension per mooring rope is 150 to 200 tons. In many cases, it becomes large, reaching even more than 3000 yen, causing various problems.

The present invention aims to solve these problems, and aims to provide a mooring device that allows floating structures to be moored efficiently and safely using mooring lines. do.

The mooring device of the present invention has a recess formed downwardly at the end of the floating structure, and engages with the inner wall surface of the 7th turn, relative to the floating structure. a floating elastic roller that guides the downward movement of the elastic roller; a float that supports the elastic roller via a roller support frame and floats on the water surface in the recess;
A mooring pole erected on the seabed near the float,
A mooring line for mooring the float is provided to the mooring column,
1. The roller support frame is characterized in that a receiving portion that can come into contact with the inner wall surface of the recess when the elastic roller is deformed is provided on the roller support frame.

Hereinafter, a mooring device as an embodiment of the present invention will be explained with reference to the drawings. FIG. 1 is a plan view thereof, and FIG.
Figure 3 is a cross-sectional view taken along the line ■-■ in the figure.
FIG. 4 is a sectional view taken along the lV'IV arrow in FIG. A partial plan view, FIG. 6 is a sectional view taken along the line Vl--Vl in FIG. 5.

As shown in Figures 1 to 4, an ark-like floating structure used for oil storage, etc. (7 tanks 1) has a dovetail-shaped horizontal section inside the recess 2 at its end. recess with 8
are formed in the vertical direction.

A float 12 is floated on the water surface inside the recess 8, and the rubber elastic roller 10 supported by the float 12 via the roller support frame 11 engages with the inner wall surface 9 of the recess 8. It is configured to guide the relative vertical movement of the tank l.

A mooring column 3 is installed on the seabed near the float 12, and one end of the mooring line (including a mooring chain) 14 is attached to a stopper 3a attached to the top surface of the mooring column 3. The other end of the mooring cable 14 passes through the opening 8a of the recess 8 and is removably connected to the roller support frame 11 on the float 12. At the same level, the aforementioned elastic rollers 10 are pivoted in pairs on the right.

Furthermore, in the mooring device of the present invention, the elastic roller 10 is the fifth
, 15, receiving portions 11a are provided in the roller support frame 11 above and below the elastic roller 10, so that the receiving portions 11a can be deformed by a heavy load and come into contact with the inner wall surface 9 of the recess 8.

As this receiving part 11a, in addition to a flat contact part as shown, a rigid roller (not shown) may be provided.

In addition, with respect to the movement of the tank 1 in the longitudinal direction, its end face is supported by a fender 6 attached to the mooring column 3, and as shown in FIG.
In the recess 2, the movement of the lever 7 in the short side direction is supported by the fender 5 of the mooring post 3, and both sides of the tank 1 are supported by the fenders 5' of the other mooring posts 4, 4.

5'.

With the configuration described above, one end of the tank 1 is attached to the mooring column 4.
・The movement in the short side direction is regulated by 1, and the other end is regulated from moving upward in the short side direction and in the long side direction to the right in the figure by the mooring post 3. The impact is absorbed by fenders 5°5' and 6.

Further, the movement of the tank 10 to the left in the figure is regulated by the elastic roller 10 of the float 12, but at this time, the tension of the mooring line 14 toward the mooring column is applied to the root stop 3a via the cushioning material 7. The float side acts on the inner wall surface 9 of the recess 8 through the elastic roller 10. Accordingly, the elastic roller 10 is pressed against the recess inner wall surface 9 either by itself or together with the receiving portion 11a in the roller support frame 11, and the elastic roller 10 attempts to follow the movement of the tank 1 together with the roller float 12 and the mooring line 14. The elastic roller 10 is used during cargo handling when the magnitude of external force is less than a certain value.
Since the deformation of is small and the receiving part lea does not contact the recess inner wall surface 9, the draft change of the tank 1 (up to about 20 m O) is resisted downward by the buoyant force of the flow 1-12. In the upward direction, an elastic roller 10. Roller support frame 1
1. The elastic roller 10 rotates against the weight of the float 12, the mooring rope 14, etc., thereby moving relatively. In other words, it does not follow the vertical movement of tank 1,
It always tries to maintain a constant height above the water surface.

In addition, the tank l is horizontally aligned with each fender at 5°5' and 6'.
When the elastic roller 10 swings within the range of elastic deformation, the elastic roller 10 follows the movement of the tank 1 together with the roller support frame 11 and the float 12.

If the drifting force of the tank 1 is smaller than the repulsive force within the range of elastic deformation of the elastic roller 10, the mooring force will be exerted with the roller The generated reaction force is reduced, and fatigue failure due to repetition can be prevented.

Extremely large external forces, such as during typhoons, which are nearly 10 times the external force that would normally occur under sea conditions, are applied to the receiving part 1.
Since the elastic roller 10 is supported by the elastic roller 1a, no excessive surface pressure is generated on the elastic roller 10, and its rotational performance can be reliably maintained.

By slightly increasing the repulsion force within the range of elastic deformation of the elastic roller 10 compared to the magnitude of the external force that occurs under normal sea conditions, it is possible to increase the repulsion force within the range of elastic deformation of the elastic roller 10. Since the receiving portion 11a of the roller support frame 11 does not come into contact with the recess inner wall surface 9, the elastic roller 10 rotates in response to changes in draft and can move relatively smoothly.

Elastic roller 110. Roller support frame 11 and mooring cable 14
When tank 1 is lowered, it is resisted by the buoyancy of flow 12, and when tank 1 is still rising, it is resisted by its own weight and tries to maintain a constant height above the water surface. It is possible to prevent the mooring cable 14 and the like from being damaged due to large energy during movement. Further, since these operations are performed completely automatically, conventional work such as adjustment of the mooring system depending on changes in the draft of the tank 1 can be omitted.

During mooring, elastic rollers 10. The mooring system, such as the roller support frame 11 and the mooring rope 14, is all supported by the float 12 and floating on the sea surface, and their movements are all in synchronization with the movement of the tank 1, so it is completely natural and efficient. Good mooring function is obtained.

In addition to the tank mooring method shown in Fig. 1, this device can also be applied to a single point mooring method, and the mooring rope 14 in the above-mentioned embodiment can be replaced with a rod or chain. .

It is.

As described in detail above, the mooring device of the present invention has an elastic roller that engages with the inner wall surface of the recess so as to allow relative vertical movement of the floating structure, and a roller support frame for the elastic roller. In addition to providing a mooring column for the float to support the floating structure through the floating structure, the roller support frame is provided with a receiving part that can come into contact with the inner wall surface of the recess when the elastic roller is deformed. There is an advantage that mooring can be carried out efficiently and safely.

[Brief explanation of the drawing]

The figure shows a mooring device as an embodiment of the present invention.
Fig. 1 is a plan view thereof, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, Fig. 3 is a partial plan view showing the enlarged section ■ in Fig. 1, and Fig. 4 is a sectional view taken along the line ■-■ in Fig. 1. FIG. 3 is a sectional view taken along the line IV-IV in FIG. 3, FIG. 5 is a partial plan view corresponding to FIG. FIG. ■...tank as a floating structure on water, 2... recess, 3
... Mooring column, 3a... Root stop part, 4... Mooring column, 5.
5', 6...Fender 17...Buffer material, 8...Recess, 8a...Recess opening, 9...Recess inner wall surface, 10
... Elastic roller, 11... Roller support frame, lla... Receiving part, 12... Float, 14 @ Mooring cable 0 Sub-agent Patent attorney Yoshihiko Iinuma Fig. 1 Fig. 4 Fig. 2 Fig. 3 Fig. 5 Figure 4 Figure 6

Claims (1)

[Claims] A recess formed in the vertical direction at the end of the floating structure; an elastic roller that engages with the inner wall surface of the recess to guide relative vertical movement of the floating structure; The elastic roller includes a float supported via a support frame and floating on the water surface in the recess, a mooring column erected on the seabed near the float, and a mooring line for mooring the float to the mooring column. A mooring device characterized in that the roller support frame is provided with a receiving portion that can come into contact with an inner wall surface of the recess when the mooring device is deformed.