JPS5912804B2 - breakwater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a breakwater in a tank yard for offshore storage of flammable liquids.

In recent years, offshore oil stockpiling has been considered in order to provide a stable and sustainable supply of oil and to safely store it.

At offshore tank yards that serve this purpose, the breakwaters are usually constructed of concrete caissons that are sunk onto and connected to rubble mounds on the seabed, but some breakwaters are built with tanks inside the yard. It must be installed after installation, and the breakwater must be constructed so that the tank can be removed from the tank yard for inspection and repair.

This invention is intended to reduce external forces acting on some of the breakwaters described above by constructing them with hollow breakwaters, and to provide a breakwater with an excellent structure that is suitable for offshore stockpiling. purpose.

Hereinafter, the present invention will be specifically explained with reference to illustrated embodiments.

In Fig. 1, 1 is a rectangular offshore oil tank yard surrounded by a seawall 2 and a breakwater 3 shaped like ] when viewed from above, 4 is a plurality of box-shaped storage tank ships moored within the yard, and 5 is a This is a managed road bridge built across a seawall 2 and a breakwater 3a on one side facing it.

As shown in FIGS. 2 to 4, the breakwater 3a facing the seawall 2 consists of a plurality of tanks arranged on the seabed 6 at intervals slightly wider than the width of the box-shaped storage tank ship 4. It consists of a support caisson 7 and a hollow breakwater member 8 that is constructed across the support caisson 7 and whose lower part is submerged in the sea.

The connecting portion between the support caisson 7 and the hollow breakwater member 8 has an oil-proof structure using packing or the like.

The hollow breakwater material 8 is divided into a number of small compartments 1 by vertical partition walls 9.
It is divided into 0.

Among these small compartments 10, four end compartments 10a located at both ends have seawater introduction holes 11 in their upper surfaces, and these compartments 10a serve as ballast tanks filled with seawater.

Moreover, one central compartment 10b located in the center remains hollow and serves as a buoyancy tank.

Furthermore, each of the three intermediate compartments 10c located between the end compartments 10a and the central compartment 10b is provided with through holes 12 at the top and bottom, so that seawater can freely enter and exit the tank. being done.

According to this invention, a part of the breakwater 3 includes a plurality of support caissons 7 arranged on the seabed at predetermined intervals, and a hollow breakwater built over these support caissons 7 and whose lower part is submerged in the sea. Since it is made of corrugated material 8, hollow wave-breaking material 8
Seawater can freely flow under the breakwater, and therefore there is no risk of large seawater pressure being applied to the breakwater 3 due to the ebb and flow of the tide, making it extremely safe.

In addition, the inside of the hollow breakwater material 8 is divided into a number of small compartments 10 by vertical partition walls 9, and the compartments 10a at both ends are ballast tanks filled with seawater, so the hollow breakwater material 8 can be used regardless of the tide. The weight of the material 8 can be supported by the mooring caisson 7 with an appropriate load, the central compartment 10b remains hollow and serves as a buoyancy tank, and the intermediate compartment 10c located between the end compartments 10a and the central compartment 10b is Since it is a tank with open holes at the top and bottom that allows seawater to freely enter and exit, buoyancy and gravity cancel each other out, and an even force is always applied to the hollow breakwater material 8 in the vertical direction at any position along its length. Therefore, the central portion is not bent in the vertical direction and no unreasonable force is generated or excessive force is transmitted to the mooring caisson 7, and the safety and durability of the hollow breakwater material 8 and the mooring caisson 7 are ensured.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; Fig. 1 is a plan view of the yard, Fig. 2 is an enlarged view of section A in Fig. 1, Fig. 3 is a partial vertical cross-sectional view of the breakwater, and Fig. 4 is IV-IV in Figure 2
It is a sectional view along a line. 1...Tank yard, 2...Revetment wall,
3... Breakwater, 4... Box storage tank ship, 6... - Seabed, 7... Support caisson, 8... Hollow defense. Corrugated material, 9...Vertical partition wall, 10...Small compartment, 10a...Both end compartments, 10b...Central compartment, 10c.
...Middle division room.

Claims (1)

[Claims] 1 At least a part of the breakwater 3 includes a plurality of support soakers T arranged at predetermined intervals on the seabed 6, and a hollow breakwater material 8 that is constructed across these support soakers T and whose lower part is submerged in the sea. The inside of this hollow wave-break material 8 is divided into a large number of sub-compartments 10 by vertical partition walls 9,
The end compartments 10a are used as ballast tanks filled with seawater, the center compartment 10b remains hollow and serves as a buoyancy tank, and the middle compartment 10c is located between the end compartments 10a and the center compartment 10b. is a breakwater characterized by a tank with through holes at the top and bottom that allow seawater to freely enter and exit.