JPS5938369B2 - Floating and sinking oil fence flotation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flotation device for a floating oil boom, and particularly to a flotation device that allows an oil boom to float and sink to a fixed position.

Generally, a floating type oil fence is installed by attaching one end of an anchor rope at a suitable distance along the length of the oil fence, and fixing the other end to an anchor sunk in the seabed.

In recent years, as petroleum cargo handling facilities have become larger due to the increase in demand for petroleum, there has been a trend towards the construction of many dolphin sea berth-type cargo handling facilities 3, which can berth two tankers a and b at the same time, as shown in Figure 1. be.

For such a sea berth 3, a floating oil fence 1 is arranged so as to surround two tankers, assuming simultaneous berthing of two tankers, and is fixed with an anchor rope 2.

The oil fence 1 arranged in this way is floated at the same time as one tanker a docks for cargo handling.
Surround the tanker a.

When another tanker b approaches for cargo handling while tanker a is carrying out cargo handling operations, the oil fence 1 is lowered and is floated again at the same time as tanker b docks at the berth.

Furthermore, when tanker a finishes cargo handling work first and sets sail, oil fence 1 is lowered again and tanker a
After setting sail, it will be resurfaced.

However, while this type of floating and sinking operation of the boom is repeated, for example, if an oil spill occurs on one tanker during cargo handling, another tanker approaches and it is necessary to lower the boom. , the oil fence is completely defenseless against this oil spill accident, and the oil fence itself is unable to perform its function, which is extremely dangerous.

In order to eliminate these drawbacks, as shown in Figure 2,
Although it is conceivable to arrange an additional oil fence 1 across directly beneath the sea berth 3 and surround each berth independently with an oil fence, this has not yet been put into practical use for the following reasons.

Under the interface below the sea berth 3, a large number of piles and the like for supporting the sea berth 3 are arranged at narrow intervals.

When the oil fence 1 is moored directly under the sea berth to an anchor sunk on the seabed using a conventional anchor rope 2 and floated and lowered, the oil fence 1 is caused to float and sink due to the influence of ocean currents, etc., as shown in Fig. 3. It is possible to move within the arc drawn by the length of the anchor rope 2 (indicated by diagonal lines), and if there is a pile etc. in this shaded area, there is a possibility that the oil fence will come into contact with the pile, and the oil fence will not be able to move. There is a high risk of damaging the float part.

The purpose of the present invention is to provide a device for smoothly floating and lowering a floating oil fence to a predetermined position without being moved by the influence of ocean currents, etc., and the present invention is a guide member disposed between an offshore structure and the seabed. is formed by fixing sliding member segments each having four hemispherical parts connected via a connecting plate to abutment plates fixed to both sides of each end of the opposing oil fence so that the four hemispherical parts face each other. The flotation device of a flotation-type oil fence is characterized by being inserted into a through-hole.

The invention will now be explained in detail with reference to the drawings.

FIGS. 4 and 5 show an embodiment of the flotation device of the present invention.

In the figure, 3 is a marine structure such as a sea berth, and 4 is a pile that supports the structure.

Note that 1 is a floating oil fence that floats and sinks between piles 4 that stand under the offshore structure 3.

In this case, as the oil fence 1, a float hose 11 that controls the buoyancy of the oil fence, fins 12 extending at the upper part in the length direction of the float hose 11, and a skirt 13 extending at the lower part are integrated by a conventional method. Use one constructed by press molding.

In the figure, reference numeral 14 denotes a weight fixed to the lower end of the skirt 13 with bolts or the like (not shown) at appropriate intervals in the longitudinal direction.

5 is a guide member disposed between the offshore structure 3 and the seabed;
It constitutes a part of the flotation device of the present invention.

In the illustrated example, the guide member 5 is a bundle of several wire ropes that is stretched through a binding device 9 between the offshore structure 3 and an anchor 8 fixed to the seabed, and extends substantially perpendicularly to the water surface.

The guide member 5 may be a rigid body such as a rail in addition to the wire rope shown in the illustrated example.

Further, the guide member 5 may be arranged not only in a straight line substantially perpendicular to the water surface but also in a curved or inclined shape depending on the position of the piles 4 etc. that stand in the sea.

A connecting portion 20 connecting the oil fence 1 facing the guide member 5 is slidably inserted.

The connecting portion 20 is a block consisting of a pair of abutting plates 21 fixed to the ends of the oil fence 1 from both sides with bolts, etc., a sliding member segment 6a having four hemispherical parts, and a connecting plate 22 connecting the two. The hemispherical recesses of the segments 6a are butted against each other and fixed with bolts or the like (not shown).

Since the guide member 5 is inserted into the through hole defined by the butt of the hemispherical recesses in this way, the connecting portion 2
0 can slide up and down with respect to the guide member 5.

At the connection part 20 of the oil fence 1, the air intake and exhaust hoses 7 are each independently connected to the float hose 11 of the oil fence 1 to the injection port.

In addition, numeral 23 in the figure is a block-shaped float member made of foam or the like to supplement the buoyancy of the connecting portion 20.

The operation of the flotation device of the present invention having the above-mentioned configuration will be explained below.

In the oil fence deployed as shown in Figure 2, for example, when tanker a comes alongside the right bank of sea berth 3 for cargo handling work, the oil fence passing directly under the sea berth 3 surrounding tanker a and the right side Raising only the oil fence and leaving the left oil fence submerged is a normal method for raising and lowering the oil fence.
This can be easily carried out by a sinking operation.

Due to the existence of the oil fence that passes directly under the sea berth 3, when tanker b comes alongside, the oil fence on the left side can be floated to surround tanker b without sinking the oil fence surrounding tanker a. All measures are in place to prevent oil spills.

The oil fence 1 installed directly below the sea berth 3 is constructed by enclosing air through an air intake/exhaust hose 7 so that a wire rope 5 is installed around the sliding member segment 6a.
It begins to float along the line and is expanded into a fixed position.

Further, when the oil fence 1 is to be lowered by exhausting the air, the oil fence 1 starts to sink from the forced sinking part by a forced sinking member (not shown) provided on any side at an appropriate position in the longitudinal direction of the oil fence 1.

After a while after the forced subsidence part sinks, the oil fence 1 will remain bent around the flotation device of the present invention, that is, air will remain in the vicinity of the flotation device, and this portion will remain floating.

However, in the flotation device of the present invention, air is also exhausted from the air intake/exhaust hose 7, which prevents air from accumulating near the flotation device and prevents part of the oil fence 1 from sinking into the sea. There is no possibility that the oil fence 1 will remain, and the oil fence 1 can be smoothly lowered into a fixed position.

As described above, according to the flotation device of the present invention, the guide member 5 such as a guide rope is disposed between the sea berth and the seabed, and the guide member 5 is provided with the connecting portion 20 that can slide up and down. By attaching the oil fence 1 to the connecting part 20 and allowing it to float and sink, the oil fence 1 can float to a fixed position without being damaged by contact with the piles 4, etc., even in places where there are many piles 4, etc. in the sea.・Can be submerged.

Furthermore, by providing the air intake/exhaust hose I on the oil fence float part near the connection part 20, the oil fence 1 can float and sink smoothly along the guide member 5, and especially when it sinks, air is completely released. A situation in which part of the oil fence 1 remains floating on the sea never occurs.

Therefore, if the flotation device of the present invention is installed directly below the sea berth 3, it can float and sink smoothly for each berth independently without damaging the oil fence 1, which can be a perfect countermeasure against oil spill accidents. This is a floating device for a floating oil boom that is extremely useful in practice.

[Brief explanation of drawings]

Figures 1 and 2 are schematic diagrams showing installation examples of floating oil booms installed surrounding a sea berth, respectively;
FIG. 3 is an explanatory diagram showing a conventional installation example of a floating oil fence, and FIG. 4 is a front view showing an example of a floating device of the present invention.
FIG. 5 is a plan view thereof. 1...floating oil fence, 2...
Anchor rope, 3... Marine structure, 4...
... Pile, 5... Guide member, 6a...
... Sliding member segment, 7 ... Air intake and exhaust hose, 8 ... Anchor, 20 ...
Connection part, 21...Abutment plate, 22...Connection plate.

Claims (1)

[Claims] 1. A guide member disposed between an offshore structure and the seabed is connected to sliding member segments having hemispherical recesses connected via contact plates fixed to both sides of each end of opposing oil fences. 1. A flotation device for a flotation-type oil fence, characterized in that the flotation device is inserted into a through hole formed by fixing the recessed portions facing each other.