JPS587014A - Floating type shock-proof and oil-proof breakwater - Google Patents

Abstract

PURPOSE:To sharply improve shock-proofing, oil-proofing, and water-break capacity, by a method wherein a subbank body is positioned such that it projects from a weir body at a side of a bank consisting of a fence suspending along a longitudinal direction of a lower part of a floating body and diagonally to the lower of a floating body. CONSTITUTION:If a colliding object 9 such as ship collides with a bank 2, the bank moves in the advancing direction of the colliding object, and a fluid force is exerted on the bank body 2. But, a subbank body 13 is located in a lower position than that of the center of gravity, and thereby the bank almost balances with a moment around the center of gravity produced by a collision force 11 exerting on the subbank body. Thus, the bank body 2 is prevented from inclining, and from the occurence of a trouble such as increase in an apparent depth of an underwater fence 7 due to the inclination.

Description

[Detailed Description of the Invention] To protect floating marine facilities from collisions due to mishandling of vessels navigating outside the floating facilities, and to prevent floating materials such as oil spilled into the open ocean due to accidents at the floating facilities, This invention relates to a floating anti-oil breakwater that has the effect of reducing the energy of waves from the open ocean as a secondary effect. The function of a shock absorber is to convert the energy of the colliding vessel into the energy of inertia, damping force, and restoring force acting on the shock absorber and absorb it. However, it was difficult to simultaneously function as an oil dike.

A conventional general type floating type anti-shock/oil breakwater is shown in Figs. 1 and 2.

FIG. 1 shows a plan view in which an appropriate number of elongated embankments 2 are arranged in a row surrounding a protected offshore facility, and adjacent embankments 2 are connected by connecting members 3. , and a flexible barrier 4 is interposed at the connecting portion thereof. FIG. 2 is a view in the direction of the n-1 arrow in FIG. 1. The embankment body 2 has a floating fence 6 disposed above the floating body 5 and an underwater fence 7 disposed below the floating body 5, and each floating body 5 is moored to the seabed with a mooring anchor chain 8. In this type of anti-impact, anti-oil breakwater, the underwater fence 7 provided at the bottom in particular exhibits remarkable effects in terms of its anti-shock, anti-oil, and wave-proofing performance. In other words, regarding the impact protection performance, the fluid force (additional mass,
This has the effect of increasing the damping force (damping force) to effectively absorb collision energy, and increasing the depth of the embankment body 2 has the effect of improving the oil and wave protection performance. Furthermore, the deeper the depth of the underwater fence 7, the more remarkable these effects will be.

Next, FIG. 3 will be explained. FIG. 3 shows the behavior of the embankment body 2 when a colliding object 9 such as a ship collides with the embankment body 2. In this way, in the conventional example, the embankment body 2 has
Collision force 1! When the resulting fluid force lO is applied, the embankment body 2 tilts significantly, and the depth of the underwater fence 7 appears to be shallower. It had the disadvantage of significantly lowering the

The present invention aims to eliminate the above-mentioned drawbacks, and aims to provide a floating type anti-impact, oil-proof breakwater designed to reduce the deterioration of the anti-impact, oil-proof and breakwater performance due to collisions of ships and the like.

For this reason, the floating anti-impact oil breakwater of the present invention includes a floating body,
In an embankment body consisting of an underwater fence whose upper end is fixed along the longitudinal direction of the lower part of the floating body and hangs downward, a secondary body is disposed diagonally below the floating body on the side of the embankment body, It is characterized in that it protrudes from the embankment body.

Below, a floating type anti-oil breakwater as an embodiment of the present invention will be explained with reference to the drawings. Fig. '4 is a view taken in the direction of the arrows corresponding to Fig. 2, and the levee body is constructed in the same manner as the conventional example. Steel, wood, bamboo, rubber,
A sub-body 13 made of synthetic resin or the like is installed in parallel with the main floating body 5. The secondary body 13 is installed below the center of the main floating body 5 or the center of gravity of the entire embankment body 2.

In Figure 4, the secondary aircraft 13 is located only on the opposite side of the protected offshore facility.
However, if there is a possibility of a collision with a small vessel operating inside the anti-shock and oil breakwater, the secondary aircraft 13 may be installed on the side of the protected offshore facility to improve the situation. good.

FIG. 5 shows a state in which a collision object 9 such as a ship collides with the anti-impact and oil breakwater according to the present invention. Since the collision object 9 pushes the dam body 2 against the secondary body 13, the levee body 2 moves in the advancing direction of the collision object 9 and receives the fluid force 10. is located below the center of gravity of the embankment body 2, so the moment around the center of gravity due to the collision force 11 acting on the secondary body 13 is the same as the moment around the center of gravity due to the fluid force 1θ acting on the underwater fence 7 and floating body 5. It fits about 9. Therefore, the embankment body 2 does not slope, and problems such as a decrease in the apparent depth of the underwater fence 7 due to the slope do not occur.

FIG. 6 shows an enlarged view of the vicinity of the sub-body 13 in FIG. 5. If the collision-proof oil breakwater collides with the colliding object 9, it will naturally result in partial destruction, but in the collision-proof oil breakwater according to the present invention, the collision object 9 collides with the sub-aircraft 13, so the destruction occurs only in the sub-aircraft 13. This occurs to the support structure member 12, but no damage is caused to the embankment body 2 including the floating body 5. That is, the auxiliary body 13 and the support structure member 12 also exhibit the same effect as the ノ(non)(-) of an automobile.

As described above, according to the floating type anti-shock, oil-proof breakwater of the present invention, the impact-proof, oil-proof, and breakwater performance can be greatly improved by the simple configuration of providing a secondary body on the side of the breakwater body. There are advantages.

[Brief explanation of the drawing]

Figures 1 to 3 show a floating type anti-oil breakwater as a conventional example, where Figure 1 is a plan view, Figure 2 is a view taken along arrow 1-u in Figure 1, and Figure 3 is the levee body. FIGS. 4 to 6 are explanatory diagrams showing a state in which a ship collided with FIG. 5, and FIG. 5 is an explanatory diagram corresponding to FIG.

Claims (1)

[Claims] In an embankment body consisting of a floating body and an underwater fence whose upper end is fixed along the longitudinal direction of the lower part of the floating body and hangs downward, on the side of the embankment body and diagonally below the floating body. A floating anti-impact and oil breakwater, characterized in that a sub-body is provided protruding from the breakwater body.