JPS5917964Y2 - oil fence - Google Patents

Description

[Detailed explanation of the idea] This idea concerns oil fences.

In recent years, with the aim of ensuring a stable and continuous supply and safe storage of petroleum, offshore stockpiling of petroleum using a plurality of storage tanks moored within a tank yard surrounded by a breakwater or the like has been considered.

In such tank yards, in order to minimize the spread of oil leakage from the tank,
An oil boom is provided for each tank or several tanks.

Oil fences must be sufficiently high above the sea surface and sufficiently deep below the sea surface to reliably prevent oil spills.

However, when an oil fence is fixedly attached to a breakwater, etc., the height and depth mentioned above change depending on changes in the tide level, so if you try to always meet the above requirements, the height of the entire oil fence will increase. This is uneconomical.

This idea was made in view of the above-mentioned circumstances, and it is an oil fence that can follow the changes in the tide level and can be constructed in a small size and reliably prevent oil spills. This is what we provide.

This invention will be explained in detail below with reference to embodiments shown in the drawings.

Figure 1 shows a tank yard surrounded by a sea wall 1 and a breakwater 2. A plurality of oil storage tanks 3 arranged in parallel are moored on the sea surface inside the yard. A pair of moored dolphins 4 are erected on the seabed on the sides of the tank 3 at both ends.

One side of the breakwater 2 facing the seawall 1 has fixed parts 5 erected on the seabed corresponding to each pair of dolphins 4, and is arranged between the fixed parts 5, and can be removed when the tank 3 is taken in or taken out. A movable part 6 is provided between the fixed part 5 and the movable part 6, and the structure is such that oil can be prevented from flowing out.

Bridges 7 for management, piping, etc. are constructed between every other breakwater fixed part 5 and the seawall 1.

Oil fences 10 are installed between the adjacent oil storage tanks 3, 3, between the breakwater fixing part 5 and the dolphin 4, between the pair of dolphins 4, 4, and between the dolphin 4 and the revetment wall 1. (See Figure 2)
.

The oil fence 10 includes a vertical plate-shaped fence main body 11 floating on the sea surface, and structures fixedly installed on the sea surface (breakwater fixed part 5, mooring dolphin 4, seawall 1, etc.) at both ends of the fence main body 11. It consists of a connecting part 12 that connects the parts.

As shown in FIG. 4, the fence main body 11 has a vertical cross section ■
It is composed of a relatively thin steel plate, and a buoyant body 14 made of styrene foam is provided above the center via a slip stopper 13, and vertical stiffeners 15 are arranged as necessary. .

The upper and lower flanges 16, 17 of the fence body 11 increase the rigidity of the fence body 11, and in particular the upper flange 16 prevents waves and oil from flying over, but these are not always necessary.

Further, the material of the buoyancy body can be changed as appropriate, and the buoyancy body can also be made into a tank.

The shape and dimensions of the fence main body 11 are such that it floats on the sea surface and maintains a vertical state with a single layer, and has sufficient height above the sea surface and depth below the sea surface to reliably prevent oil leakage. As such, it is determined.

Details of the connecting portion 12 are shown in FIG.

Side frames 21 and 22 corresponding to each other are vertically provided at both ends of the fence main body 11 and the revetment wall 1, etc., and a pair of upper and lower elastic frames parallel to each other are provided at the upper and lower ends of these frames 21 and 22. Both ends of the plate holding member 23 23 are rotatably attached by pins 24 .

These members 23,23 are made of channel steel, and the pair of flange portions 25 of the upper member 23 protrudes downward, and the pair of flange portions 25 of the lower member 23 protrudes upward.

The pin 24 on the frame 22 of the seawall 1 etc. is the holding member 2
The holding member 23 is fitted into a long hole 26 formed in the frame 22 so that the horizontal distance between the revetment wall 1 etc. and the fence body 11 does not change even if the fence body 11 moves up and down. It is designed to be able to rotate and move slightly in the longitudinal direction (see Figure 7).

Between the two frames 21 and 22, a longitudinally grooved elastic plate 28 having a trapezoidal cross section and having a pair of flange portions 27 whose tips are widened is arranged such that the upper and lower ends thereof are connected to the pair of flange portions 25 and 25 of the holding member 23. so that the flange portions 27 are pressed into contact with each other, and are held in between.
They are installed side by side in a compressed manner.

The outer surface of the flange portion 27 of each elastic plate 28 and the flange portion 2
7, grooves 29 extending in the vertical direction are formed to face each other, and the adjacent flange portions 2
7.27 Between each other and between the flange portion 27 and the frame 21
．． 22 is kept watertight by vertical rod-shaped sealing material 30 fitted in opposing grooves 29 and 29 (see FIG. 8).

These elastic plates 28 are moved vertically to deform the connecting portion 12 while keeping the water content, thereby allowing the fence body 11 to follow changes in the tide level.

In addition, the height of the connecting portion 12 is set such that it can always maintain a sufficient height above the sea surface and a sufficient depth below the sea surface even when the tide level changes.
It is larger than the total height of the fence body 11.

In the above, the fence main body 11 moves up and down according to changes in the tide level, and the connecting part 12 assumes a rectangular shape as shown in FIGS. 2 and 5 when the tide level is at its highest (at high tide); When the tide is low (during low tide), the elastic plate 28 is deformed into a parallelogram by shifting up and down, as shown in FIGS. 3 and 6.

Even if the tide level changes, by deforming the connecting portion 12 in this way, the water in the fence body 11 is always kept constant, and any part of the fence body 11 or the connecting portion 12 is always above sea level. By ensuring sufficient height and sufficient depth below the sea surface, oil spills can be reliably prevented.

In addition, since the fence body 11 follows changes in the tide level,
By suppressing the height to the necessary minimum, the entire oil fence 10 can be configured to be compact.

As described above, in the oil fence according to this invention, the vertical plate-shaped fence main body 11 is floated on the sea surface, and the end portion of the fence main body 11 is connected to a structure fixedly installed on the sea surface.
Both ends of a pair of upper and lower elastic plate holding members 23 are rotatably attached to each other, and a pair of flange portions 2 with widened tips are provided.
A plurality of longitudinal groove-shaped elastic plates 28 having a plurality of vertical grooves 7 are held at both upper and lower ends by the holding member 23, and their respective flange portions 27 are pressed against each other so that they can move up and down relative to each other while maintaining moisture. In addition, since they are installed in a compressed manner between the structure and the end of the fence body 11, they can follow changes in the tide level.
As a result, it is possible to have a compact structure and to reliably prevent oil and the like from flowing out.

[Brief explanation of drawings]

The drawings show an embodiment of this invention; Fig. 1 is a plan view of the tank yard where the oil fence is installed, Figs. 2 and 3 are front views showing the oil fence at high tide and low tide, respectively, and Fig. 4 is a plan view of the tank yard where the oil fence is installed. The figure is a perspective view of the fence body, Figures 5 and 6 are enlarged perspective views of part A in Figure 2 and part B in Figure 3, respectively, Figure 7 is a partially enlarged view of Figure 5, and Figure 8 is a perspective view of the fence body. Fifth
It is an enlarged cross-sectional view taken along the line in FIG.

Claims (1)

[Scope of utility model registration request] A vertical plate-shaped fence body 11 is floated on the sea surface, and both ends of a pair of upper and lower elastic plate holding members 23 are rotatably attached to a structure fixedly installed on the sea surface and to the ends of the fence body 11. , a plurality of vertically grooved elastic plates 28 each having a pair of flange portions 27 widened between their tips are held at both upper and lower ends by the holding member 23, and the respective flange portions 27 are pressed against each other to retain water. The oil fence is installed in a compressed manner between the structure and the end of the fence main body 11 so that the oil fences can move vertically relative to each other in a compressed state.