JPH11263288A - Floating body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floating structure free from a seesaw movement due to sealevel fluctuation or waves. SOLUTION: This floating body structure F is provided with a deck structure F1, buoyancy adjusting mechanisms 10, and seating mechanisms K'. The respective buoyancy adjusting mechanisms 10 include buoyancy bodies 13 serving as buoyancy generating sources and cylindrical bodies 11 serving as structures of connecting the buoyancy bodies 13 with the deck structure F1. The side surfaces of the cylindrical bodies 11 are formed with a plurality of openings 12 respectively. The respective seating mechanisms K' are constituted of dolphins 4 and piles 5 reaching the bottom of sea. The deck structure F1, receiving buoyancy slightly insufficient for its total weight from the buoyancy adjusting mechanisms 10, leaves remaining weight to the seating mechanisms K'. Sea water invading under the deck structure F1 due to sea-level fluctuation or waves passes the inside and outside of the cylindrical bodies 11 through the openings 12, or passes through the whole bottom surface of the deck structure F1, thereby giving no buoyancy fluctuation to the deck structure F1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating structure used as an oil drilling rib, an airport, a mooring facility, an artificial island, a waste treatment facility, and the like provided on the sea surface.

[0002]

2. Description of the Related Art It has been considered to construct facilities such as airports and artificial islands that require a relatively large area on a large floating structure. This type of floating structure has many advantages over providing similar facilities on land. For example, if the floating structure is an airport, there is no concern about noise and the like. In addition, in principle, facilities can be constructed on an arbitrary area at sea, and there is an advantage that restrictions on land area and land acquisition costs imposed in the case of construction on land can be greatly eased. In addition, unlike the conventional landfill method that is generally used when constructing a structure on the sea, the floating structure does not require a large amount of earth and sand, and also works to protect the coast adjacent to this structure. Since there is no need for this, there is a great advantage in terms of construction costs.

[0003] Since the above-mentioned floating structure is installed in a state of floating on the sea surface, it always receives a force due to waves, that is, a oscillating power (vertical movement) or a drifting force (horizontal movement). The floating structure is provided with seabed mooring means K as shown in FIG. 5 in order to prevent the influence of the rocking power and the drifting force. The seabed mooring means K is, as shown in the figure, a mooring dolphin 1 located on the sea surface L.
And a pile 2 connected to the mooring dolphin 1 and reaching the seabed M. The floating structure F is moored at a certain point on the sea surface L by being connected to the mooring dolphin 1. In addition, a breakwater 3 is provided in the direction of the open sea as viewed from the floating structure F, and also has a function of weakening the swinging power and the drifting force received by the floating structure F.

[0004] In addition to the above-mentioned structure, there is also a structure in which a floating structure F is constituted by a deck structure F1 and a floating body F2 as shown in FIG. In such a configuration, the floating body 2 is a main buoyancy source for the floating structure F. Incidentally, such a floating structure F is called a semi-sub type floating structure.

[0005]

However, in the seabed mooring means K described above, it was difficult to prevent the floating structure F from moving up and down due to tide fluctuations and waves.
This is due to the influence exerted on the floating structure F by the oscillating power according to the classification of the oscillating power and the drifting force acting on the floating structure F described above. Thus, in the case of the semi-sub type floating structure F shown in FIG. 6, the mooring dolphin 1 is of a side support type corresponding to the vertical movement of the floating structure F.

When the floating structure F moves up and down as described above, the construction of roads, buildings, and other structures built on the upper surface of the floating structure F is limited. Also, in consideration of the case where the land is actually used, it can be easily understood that the use of the swinging land becomes unfavorable. Thus, the conventional floating structure F
, There was a problem in the above-mentioned function.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a floating structure that does not move up and down due to tide level fluctuation and waves.

[0008]

The present invention adopts the following means to solve the above-mentioned problems. That is, claim 1
The floating structure according to the present invention includes a deck structure that provides a facility construction site on the sea surface, a buoyancy adjustment mechanism that generates buoyancy for floating the deck structure on the sea surface, and a semi-floating state by the buoyancy adjustment mechanism. And a seating mechanism for the deck structure to be seated.

According to this, the deck structure is in a semi-floating state due to the buoyancy generated by the buoyancy adjusting mechanism, and has a form in which a part of its weight is given to the seating mechanism. That is, the deck structure is not in a completely floating state, nor is its entire weight given to the seating mechanism, but both states appear.

In the floating structure according to the second aspect, as the buoyancy adjusting mechanism, a buoyant body having an opening formed in a side surface thereof, and a buoyant body installed at a lower end of the cylindrical body and serving as a buoyancy generating source And a plurality of the buoyancy adjusting mechanisms are provided so that an upper end of the cylindrical body is in contact with a lower surface of the deck structure.

According to this, in the buoyancy adjusting mechanism, the source of buoyancy is the buoyancy body.
The tubular body is a structure for connecting the deck structure and the buoyant body to each other. Further, since an opening is formed on the side surface of the cylindrical body, seawater that has entered the lower surface of the deck structure due to tide level fluctuations and waves passes through the space inside and outside the cylindrical body due to the opening. . Therefore, buoyancy fluctuation does not occur in the entire floating structure.

Further, the floating structure according to a third aspect of the present invention includes a truss structure and a buoyant body located below the truss structure and serving as a buoyancy generating source, as the buoyancy adjusting mechanism. The truss structure is provided on the lower surface of the deck structure so as to be in contact with the upper part of the truss structure.

In the buoyancy adjusting mechanism, the buoyancy is generated by a buoyant body, and a structure for connecting the deck structure and the buoyant body to each other is a truss structure. It is. Of these, in the truss structure, seawater that has entered the lower surface of the deck structure due to tide level fluctuations and waves passes between the beams constituting the truss structure. Therefore, as described above, the buoyancy does not fluctuate in the entire floating structure.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. It is to be noted that the reference numerals used in the drawings referred to in the description of the prior art and the like refer to the same reference numerals. Signs shall be used.

1 and 2, the floating body structure F is generally constituted by a deck structure F1, a buoyancy adjusting mechanism 10, and a seating mechanism K '. The upper surface of the deck structure F1 is a site for building a building, a road, or another structure. Therefore, the floating structure F is at sea level L
The deck structure F is normally installed in an area with
1 is always located on the sea surface L.

The buoyancy adjusting mechanism 10 comprises a cylindrical body (cylindrical body) 11 and a buoyancy body 13, as shown in FIGS. As shown in FIGS. 1 and 2, a plurality of such members are provided such that the upper end of the cylindrical body 11 contacts the lower surface of the deck structure F1. A plurality of openings 12 are formed on the side surface of the cylindrical body 11. These openings 12 allow seawater to enter and exit the cylindrical body 11 both inside and outside. The buoyancy body 13 is a buoyancy source that brings the deck structure F1 into a floating state. This is formed in a rectangular parallelepiped shape, and secures a volume for generating buoyancy for the entire deck structure F1. As shown in FIG. 1, the buoyancy body 10 is entirely located below the sea level L. The attachment of the buoyancy adjusting mechanism 10 and the deck structure F1 is performed by bolts 14 as shown in FIG. Therefore,
The attachment and detachment of the buoyancy adjusting mechanism 10 can be easily performed.

The seating mechanism K 'includes a dolphin 4 and a pile 5. This seating mechanism K 'has the same configuration as the seabed mooring means K described in the section of the prior art, as is apparent from this configuration and FIG.
That is, in a configuration including the dolphin 4 located on the sea surface L and the pile 5 connected to the dolphin 4 and reaching the seabed M, the dolphin 4 and the deck structure F1 are in contact with each other. However, in the present embodiment, as shown in FIGS. 1 and 2, the deck structure F1 is configured to be mounted on the upper surface of the dolphin 4. See).

As described above, the deck structure F1 is located on the sea surface L by the buoyancy generated from the total volume of the plurality of buoyancy adjusting mechanisms 10, that is, the plurality of buoyant bodies 13. This buoyancy can be changed by adjusting the size of the volume of the buoyant body 13 and the number of the buoyancy bodies 13 to be installed. In the present embodiment,
The buoyancy generated for the deck structure F1 is set to be slightly smaller than the overall weight of the deck structure F1. That is, the deck structure F1 is in a so-called semi-floating state. As a result, the deck structure F1 is seated on the seat structure K ', that is, the upper surface of the dolphin 4.

The operation and effects of the floating structure F having the above-described structure will be described below. When the floating structure F is installed on a certain sea surface L, the deck structure F1 is mounted on the buoyancy body 1 of the buoyancy adjusting mechanism 10.
3 does not mean that it is in a completely floating state due to the buoyancy generated, and that it does not give its entire weight to the seating mechanism K '. In other words, while the deck structure F1 is in a semi-floating state, the remaining load is applied to the seating mechanism K '. In addition, since the opening 12 is formed on the side surface of the cylindrical body 11, seawater that has entered the lower surface of the deck structure F1 due to tide level fluctuations and waves can prevent the seawater from entering the opening 1
2 passes through the space inside and outside the cylindrical body 11.
Therefore, buoyancy fluctuation does not occur in the entire floating structure F.

As described above, since the deck structure F1 of the floating structure F always gives a part of its load to the seating mechanism K ', even if the water level fluctuates due to the ebb and flow of the tide,
When viewed from the land, the upper surface of the deck structure F1 does not move up and down, which is extremely advantageous in the loading function. Further, since the total weight of the deck structure F1 and the buoyancy generated by the buoyant body 13 are well balanced as described above, the seating mechanism K 'is not subjected to an unreasonable load, and from the viewpoint of strength. Is also advantageous.
Further, by the function of the opening 12 formed in the cylindrical body 11 described above, buoyancy does not fluctuate due to seawater that has entered the lower surface of the deck structure F1 due to tide level fluctuations and waves. The upper surface does not move up and down.

The buoyancy adjusting mechanism 1 according to the embodiment is described.
0, that is, the cylindrical body 11 and the buoyancy body 13 are located below the sea level L, and therefore are always exposed to a severe corrosive environment. In particular, the cylindrical body 11 is considered to be in an environment more susceptible to corrosion since seawater enters and exits through the opening 12 on the side surface thereof. Therefore,
It is preferable that the cylindrical body 11 and the buoyant body 13 be surface-treated with a corrosion-resistant material, or that the entire body be made of a corrosion-resistant material such as titanium. However, the buoyancy adjustment mechanism 1 in the present embodiment
0 has a structure attached to the lower surface of the deck structure F1 with the bolts 14 as described with reference to FIG.
It is easily removable. From this, as an anti-corrosion measure, an alternative to the buoyancy adjustment mechanism 10 in which the cylindrical body 11 and the buoyancy body 13 are integrated is prepared in advance, and in consideration of the progress of corrosion, the floating body structure F A measure may be taken in which the buoyancy adjusting mechanism 10 is appropriately replaced while being installed on the sea surface L.

The opening 12 formed on the side surface of the cylindrical body 11 is not limited to the form shown in the enlarged view of FIG. 1 or FIG. For example, the opening 12 may have a slit shape. In short, what is necessary is just to be able to enter and exit seawater inside and outside the cylindrical body 11 without interruption.

Hereinafter, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the configuration of the buoyancy adjusting mechanism is different from that of the previous embodiment, and the other configurations are the same. Therefore, the following description will focus on this point. In the drawings referred to,
The reference numerals used in the drawings referred to in the description of the above-described embodiment are the same as those used in the drawings when indicating the same contents.

In FIG. 4, a buoyancy adjusting mechanism 20, which is a component of the floating structure F ', is a truss structure T composed of a plurality of pipes 21, and is located below the truss structure T and is a source of buoyancy. The buoyancy member 22 is provided. The truss structure T has a sufficient resistance from the viewpoint of strength against the load of the deck structure F1 or the buoyancy generated from the buoyant body 22 and transmitted to the deck structure F1 by combining the pipes 21 each being a single body. It has become something. Buoyancy body 2
Reference numeral 2 denotes a rectangular parallelepiped structure in which a volume for generating buoyancy for the entire deck structure F1 is secured.
The buoyant body 22 is entirely located below the sea level L.

The buoyancy adjusting mechanism 20 is connected to the deck structure F1.
Is set to be slightly smaller than the overall weight of the deck structure F1. As a result, the deck structure F1 is seated on the upper surface of the dolphin 4 in the seating mechanism K 'while being in a semi-floating state, as in the previous embodiment. In addition, seawater that has entered the lower surface of the deck structure F1 due to tide level fluctuations and waves will pass through the gaps between the respective pipes 21. Therefore, buoyancy fluctuation does not occur as the whole floating structure F ′.

Thus, it can be seen that the floating structure F 'can achieve exactly the same effects as in the previous embodiment. That is, this floating structure F ′ is
It can be said that the upper surface does not easily move up and down due to tide level fluctuations and waves, and has an advantageous mounting function. Further, the seating mechanism K 'is not subjected to an unreasonable burden, and has an advantage in strength.

In the second embodiment, the pipes 21 and the buoyant members 22 constituting the truss structure T are provided with some corrosion resistance in the same manner as described for the cylindrical body 11 and the buoyant members 13 in the previous embodiment. It is preferable that measures have been taken. As for the pipe 21, it is preferable to use a pipe as thin as possible. This is because if the truss structure T is configured using the thin pipe 21, the buoyancy fluctuation caused by the tide level fluctuation and the waves can be reduced. Further, the embodiment of the truss structure T, that is, the manner of assembling the pipe 21 is not limited to the one shown in FIG. In short, any structure may be used as long as it can play a role of transmitting the own weight of the deck structure F ′ and the buoyancy generated from the buoyant body 22.

In each of the two embodiments described above, the seating mechanism K 'composed of the dolphin 4 is used. However, for example, another seating structure such as a caisson may be used. May be something. The present invention includes such cases within the scope of the concept.

[0029]

As described above, the floating structure according to the first aspect has a deck structure, a buoyancy adjusting mechanism, and a seating mechanism. Due to the buoyancy adjustment mechanism and the seating mechanism, the deck structure does not appear to be completely floating in the normal state, nor does it allow the entire weight to be shared by the seating mechanism. Situation. Therefore,
First of all, since the deck structure is completely seated on the seating mechanism, the tide level does not fluctuate, and the upper surface position of the deck structure can be kept constant.
An excellent loading function can be exhibited. Further, since the deck structure is in a so-called semi-floating state, a floating structure excellent in strength can be provided without imposing an excessive load on the seating mechanism.

According to a second aspect of the present invention, in the floating structure, the buoyancy adjusting mechanism includes a buoyant body serving as a source of buoyancy and a connecting structure between the deck structure and the buoyant body. And a formed cylindrical body. Of these, in the opening on the side surface of the cylindrical body, seawater that has entered the lower surface of the deck structure due to tide level fluctuations or waves passes through the space inside and outside the cylindrical body by the opening. Therefore, the floating structure does not fluctuate as a whole, and the upper surface of the deck structure can be held at a fixed position. That is, it can be said that this floating structure is suitable for realizing the above-mentioned effect.

Further, the floating structure according to a third aspect of the present invention comprises, as the buoyancy adjusting mechanism, a buoyant body and a truss structure which is a connecting structure between the buoyant body and the deck structure. Therefore, as described above, the upper surface of the deck structure does not fluctuate by passing between the beams constituting the truss structure that has entered the lower surface of the deck structure. With this, the above effect can be realized.

[Brief description of the drawings]

FIG. 1 is a side view showing a floating structure according to an embodiment of the present invention.

FIG. 2 is a top view of the floating structure shown in FIG.

FIG. 3 is a side view showing a buoyancy adjusting mechanism provided in the floating structure shown in FIG. 1;

FIG. 4 is a side view showing a floating structure having a form different from that of FIG. 1;

FIG. 5 is a side view showing a conventional floating structure.

FIG. 6 is a side view showing a conventional floating structure having a form different from that of FIG.

[Explanation of symbols]

 F, F 'Floating structure F1 Deck structure K' Seating mechanism L Sea surface T Truss structure 10, 20 Buoyancy adjustment mechanism 11 Cylindrical body (cylindrical body) 12 Opening 13, 22 Floating body

Claims (3)

[Claims] 1. A deck structure for providing a facility construction site on the sea surface, a buoyancy adjusting mechanism for generating buoyancy for floating the deck structure on the sea surface, and a semi-floating state by the buoyancy adjusting mechanism. And a seating mechanism for seating the deck structure. 2. The buoyancy adjusting mechanism includes a cylindrical body having an opening formed on a side surface thereof, and a buoyant body installed at a lower end of the cylindrical body and serving as a buoyancy generating source. The floating structure according to claim 1, wherein a plurality of mechanisms are provided such that an upper end of the cylindrical body is in contact with a lower surface of the deck structure. 3. The buoyancy adjusting mechanism comprises: a truss structure;
And a buoyancy body serving as a buoyancy source located below the truss structure. The buoyancy adjustment mechanism is provided on a lower surface of the deck structure so as to be in contact with an upper part of the truss structure. Floating structure.