JPS59199484A - Large-sized marine structure for storage - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is an open ocean, but it is located in an earthquake-prone sea area where seismic force is predominant as an external force, and at a water depth of 10 f'IL to 3.
Regarding large offshore structures constructed in shallow waters of approximately 0m,
More specifically, the present invention relates to a large storage structure constructed as a so-called offshore stockpiling plant form for the purpose of storing oil and the like.

(Background Art) Conventionally, gravity-type (bottom-mounted) marine structures constructed in shallow waters are mainly classified into the construction types shown in FIGS. 1 to 3.

Figures A and B show two artificial islands protruding above the sea level W-L, and a facility 32 on the artificial island 2.
The revised format is shown. Figure B shows an example in which two artificial islands were constructed on the improved ground 4 by performing ground improvement when the submarine ground was soft.

This type of construction is safe against natural conditions. However, as the water depth increases, the mass of the artificial island 2 increases, and the number of steps and costs involved in its construction increase dramatically, and the construction method also becomes difficult. Furthermore, if the artificial island 2 is not a water-filled structure, it is difficult to dismantle and remove it.

Figures 2A and 2B show five ready-made concrete structures installed on the seabed. Figure 3 A and B are the same ready-made structures as before! This shows a model where IJ5 is completely buried under the sea, and only Denki 6 is protruding above the sea surface. In this type of construction, a large buoyant force acts due to the part of the structure 5 buried under the sea (storage space). Therefore, in order to stabilize the structure 5, a large amount of ballast material is required in addition to its own M amount. As a result, Structure 5 was extremely large, and had drawbacks such as being unable to be constructed using existing docks. By the way, among external forces, ground force is particularly dominant, and other wave forces,
The stability of a structure 5 constructed in a so-called earthquake-prone area where tidal forces can be ignored is checked using the formula: F8=(w-V)μn. Here, F8 is the safety factor, W is the amount of borrowed vehicles of the structure 5, ■ is the buoyant force acting on the structure 5, k is the earthquake seismic intensity, and μ is the Masasashi coefficient.

The above equation is transformed into F,=dak(1-V-).

Here is a constant number. Therefore, in order to secure the safety factor F8 Akaneme Soreke, '! -You can see that it is necessary to make the purple smaller. Very, vk smaller Katajima or w2
It turns out that it should be made larger.

However, increasing the air weight W2 of the structure means that
Ballast part? It's about being a good listener. This will increase the size of the structure and increase the cost, so W should be made as small as possible from the standpoint of ease of construction. Therefore, it is understood that in order to ensure the nJ safety factor F8, the buoyant force V acting on the structure should be reduced by /h as much as possible.

(Objective of the Invention) Therefore, the object of the present invention is to improve the seismic safety factor Fsk of marine structures of the construction type using ready-made structures as shown in the above @ Fig. 2 or Fig. 3. Specifically, 〃)〃A large offshore structure for storage that has been improved so that it can be sold under conditions that are easy to construct. It is about providing.

(Configuration and effects of the first invention) In order to achieve the above object, the large marine F4 structure for storage of the present invention is a mound (artificial ground) at a predetermined height on the seabed.
A structure (tank) that protrudes above sea level is installed on the mound. The structure is built in advance at the nearest dock and towed out to sea. The mound is constructed by dropping stones of terror. The height of the mound shall be appropriate for installing the towed structure.

First, this invention is characterized by the fact that the mound does not raise the bottom of the structure and reduces the volume of water inundation. Therefore, even if the W value is small, the V value can be made even smaller, resulting in an earthquake safety factor of F8? ! Therefore, it is possible to secure a higher l-value. In other words, the scale of the structure, especially the scale of the ballast tank, can be reduced, and such a structure can be constructed (constructed) using an existing dock.

Therefore, when considered comprehensively, it is possible to achieve high safety and safety while reducing costs. In addition, as a result of the buoyancy force (2) acting on the structure being reduced, it is particularly effective when a 4FW is constructed as a non-oil/water displacement type oil storage tank because the load on the ballast is small.

(Structure and effect of the second invention) The large-sized ocean +1 relic for storage of this invention has all the main parts of the 4N configuration of the first invention, and is furthermore attached to the above sea level part of the structure. It is said to have a configuration with ballast tanks installed.

In other words, while reducing the buoyant force Vk acting on the structure,
The floating weight of the structure is increased by the use of offshore ballast tanks, which increases the current safety factor of F8, which is determined by the above formula! It has some characteristics.

In the case of this invention, the ballast tank is made of 414! Is it watery when being towed? It will be manufactured integrally with the pre-fabricated relic to be immersed in water for the necessary and sufficient amount to preserve rJI'M, and the remaining ballast tank will be installed in an aerial location where it will not be affected by buoyancy. As the ballast material, seawater or sand canisters are used. Therefore, this invention can reduce the amount of water generated during towing of relics, make the mound that much higher, and increase the height of the mound. In addition to being effective in reducing Il, it also has the same effects as the first invention above? It is played.

(Example) Next, the fourth embodiment and the embodiment shown in FIG. 5 will be explained.

In the figure, 11 is the seabed, 12 is improved ground that has improved the 11 soft seabeds, 13 is a mound built on the seabed 11 including the 12 improved ground, 14 is a structure installed on the mound 13, and 15 is a structure installed on the mound 13. This is a deck installed elevated above the structure 14. The illustrated marine structure is an example of an oil storage plant constructed in a summer shallow sea area with a water depth of about 22 nL as an oil storage plant with a storage capacity of about 50,000 kl.

The mound 13 is constructed by piling up all the stones and the like.

The diameter of the bottom surface is rroom, and the actual height of the bottom of the sea is about 7 to 8 meters.

The structure 14 is made of reinforced concrete, and is constructed as a ready-made product at the nearest dock, and is towed and installed onto the mound 13. This structure 14 consists of an oil tank portion 14a and ballast around its outer periphery. Tank part 14h
, and so on.

The structure 14 is manufactured to have a maximum outer diameter of tg90~pioom, a substantial height of 20"m for the ballast tank portion 14b, a substantial height of 27"m for the oil tank portion 14a, and a height of approximately IQm above the ballast tank portion 14b. It is assumed that the extending portion protrudes above the sea level W-L.

The towed water of the structure 1 and 14 is approximately 12.571L, and the ballast tank portion 14bO size is installed as the size necessary to secure this water.

Iii] The story of the story of the history of the history of history 14 Mc water (12.5 m) and the taste of mound 13 (7-8 nol) for 4 minutes (4,5 m).
5 to 5.5 m) is secured as a necessary clearance for the work of installing the structure 14 on the mound 13.

In addition, the remaining ballast tanks 16 that are required
is the above sea level part of the structure 14, which is shown by the dotted line in Figure 5, and is additionally installed as needed or from the beginning of the construction of the structure. .

The deck 15 is mounted on the pillar 11 erected on the ballast tank portion 14b of the structure 14, and the deck
It is supported via elevated structure at a stable height.

This deck 15 is a space for managing the operation and maintenance of the structure 14, and various equipment for operation and maintenance and a residential facility for the manager are provided here.
4゜Incidentally, the effects of the above example constructed as an oil storage plant form with an oil storage capacity of 50,000μ are quantitatively different from those of the conventional example (Fig. 2 or 3), which is assumed to be constructed under the same conditions. The comparison is as follows.

The contoured volume of the oil tank portion 14a of the structure 14 is 63,000-at, a figure common to conventional structures. Shi sword, ballast tank part 14
The contour volume of b is 4 s in the above example,
o o o m, the conventional one is 1.78,
000m is also slow, and there is a big difference. If we calculate this simply by H1, the ballast tank part of the above embodiment is reduced to about 1/4 the scale of the conventional one, and is lighter and cheaper by the difference 13o,ooo= of the contour body)ljt. It becomes. By the way, the mound 13, which is essential in the above embodiment, is made of cheap stone (since it is dyed, ff1j).Compared to the difference in concrete volume, the mound 13 is insignificant and the economic burden is small. few.

[Brief explanation of the drawing]

Figure 1 A, B-3rd figure A and B are conventional marine structures? The explanatory drawings, which are divided into construction types, and FIGS. 4 and 5 are a plan view and a front view showing a try-out structure which is an embodiment of the present invention ψ1. 11...Mr. Umino 13...Mount WIL・
...21σ surface level 14...hon't construction #muse
16...Ballast tank inventor: Tamaki Fuki (Kakumei name: Momohide Tsu - inventor: Kawahara 1) Minoru Fig. 1 A B Fig. 2 A B Fig. 3 A B Fig. 4 7 7 Fig. 5 14a 12 Continued from page 10 Inventor Takashi Oguro 8-21-1 Ginza, Chuo-ku, Tokyo Takenaka Corporation Tokyo Head Office 0 Inventor Yogo Nishinaka 2-5-14 Minamisuna, Koto-ku, Tokyo Takenaka Corporation Technical Research Center 0 Inventor Tetsuo Mochida 2-5-14 Minamisuna, Koto-ku, Tokyo Takenaka Corporation Technical Research Center

Claims (3)

[Claims] (1) A doll marine structure for storage, which is characterized by constructing a mound of a predetermined height on the seabed, and installing all ready-made structures protruding above sea level on the mound. (2) Scope of Patent Request The mound described in item 1 is a large marine storage structure having a height that maintains a predetermined construction clearance between the structure and the towed water. (3) A mound of a predetermined height is constructed on the seabed, and all ready-made structures that protrude above the sea level are installed on the mound, and a pantyhose tank T8 is placed above the sea surface of the structure. A large offshore structure for storage consisting of: