JPH0724412Y2 - Floating body of a breakwater - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a floating body of a floating breakwater used for maintenance of fishing grounds for the purpose of breaking waves in aquaculture facilities, and maintenance of fishing ports for the protection of fishing boats. It is a thing.

[Prior Art] As shown in FIG. 5, a floating breakwater is a floating body b floating on a water surface a.
Is moored to an anchor c fixed to the seabed via a mooring line d, and the incoming wave e is extinguished by the floating body b.
Generally, when a short wavelength wave with a short cycle is targeted for extinction,
The cross section of the floating body b in the wave e direction is formed in a box shape. Thus, conventional floating bodies having a box-shaped cross-section include those made of steel plate and those made of concrete.

A conventional floating body b having a box-shaped cross-section made of steel plate will be described with reference to FIG. 3. A rectangular box-shaped outer shell s is manufactured by a bottom plate f and side plates h arranged on four sides and an upper plate g. A hollow portion i is formed inside the outer shell s, and a reinforcing beam j is fixed along the inner surface of the outer shell s.

In the figure, k is a stiffening material, and 1 is a pillar material.

A conventional floating body b having a box-shaped cross section made of concrete will be described with reference to FIG. 4. The floating body b is provided in an outer shell t and an inner hollow portion n of the outer shell t, and includes a top portion o, a bottom portion p, and side portions q. The connecting material r that is connected is integrally formed of concrete such as reinforced concrete or prestressed concrete.

[Problems to be Solved by the Invention] However, the above-described conventional floating body b having a box-shaped cross section has the following problems.

(I) In the case of the steel plate floating body b, since the floating body b is installed on the sea or in the sea, the corrosion of the steel material particularly in the part exposed to the splash zone on the sea is severe, and a large amount of corrosion allowance is expected in advance. It is uneconomical because it requires a large amount of steel material and requires frequent coating, which increases maintenance costs and requires a structure to obtain the desired height of the center of gravity in terms of wave-dissipation performance. .

(II) In the case of a concrete-made floating body b, there is a risk that the concrete will crack and the interior of the floating body will be submerged and sink, which will increase the cost in quality control for preventing this cracking, and the formwork for manufacturing. This also causes an increase in cost.

(III) In any floating body b made of steel plate or concrete,
When the size and weight exceed the limits of lifting machines such as floating cranes, they have to be built in a dock for launching, which often limits the place of production.

Therefore, the present invention has been made in view of the above circumstances and has as its object to solve the above-mentioned problems that a floating body made of a steel plate and a floating body made of concrete have respectively.

[Means for Solving the Problem] The present invention forms a hollow steel outer shell having a box-shaped cross section by a bottom plate, a side plate, and an upper plate, and the upper plate has an upper surface,
It is characterized in that concrete having a predetermined thickness is placed so that the draft and height of the center of gravity of the floating body can be adjusted.

[Operation] Since concrete material is placed on the upper surface of the upper plate, corrosion of the upper plate is prevented, and the amount of concrete placed on the upper surface of the upper plate or the amount of concrete placed on the inner surfaces of the upper plate and the bottom plate is adjusted. By doing so, the draft required for wave-dissipating performance,
The height of the center of gravity can be easily determined, and even if the concrete on the upper plate is cracked, the upper plate prevents water from entering and the sinking of the floating body can be avoided, and the life of the floating breakwater can be extended. The draft and height of the center of gravity are adjusted by adjusting the amount of this material when sand, stone or other material other than concrete is put on the inner surface of the bottom plate.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which a rectangular plate-like bottom plate 1 and an upper plate 2 made of a steel material extending horizontally in parallel at predetermined vertical intervals extend vertically to the peripheral surface 4 surface. An outer shell 14 is formed by fixing the steel side plate 4 by welding or the like, the upper end of the side plate 4 is extended above the upper plate 2, and concrete is provided in a space between the extension and the upper plate 2. 6 is cast, and a hollow portion 7 formed inside the outer shell 14
The reinforcing girder material 9 is fixedly attached to the bottom plate 1, and concrete 10 is placed on the upper surface of the bottom plate 1.

Reference numeral 11 is a stiffening material, and 12 is a pillar material for connecting the bottom plate 1 and the upper plate 2.

Since the steel upper plate 2 of the floating body 5 is covered with the concrete 6, it is not directly exposed to the splash zone on the sea, and the corrosion of the surface of the upper plate 2 can be prevented.
Further, the draft and the height of the center of gravity required for wave-dissipating performance can be easily determined by adjusting the amount and distribution of the concrete 6 and 10 on the upper plate 2 and the bottom plate 1 regardless of the amount of steel material. Become. Further, even if the concrete 6 on the upper plate 2 is cracked, the upper plate 2 made of steel is used for waterproofing, so that it is possible to prevent sinking of the floating body due to water leakage entering the hollow portion 7.

FIG. 2 shows another embodiment of the present invention, which is an upper plate 13
The upper surface of the upper plate 13 is formed in an uneven shape so that the concrete 6 can be poured and the strength of the upper plate 13 can be increased.

Also in this embodiment, the same operation as in the case of the embodiment of FIG. 1 can be brought about.

The concrete 10 on the bottom plate 1 is useful for preventing corrosion of the bottom plate 1, but since the bottom plate 1 is a portion that originally has a smaller amount of corrosion than the upper plate 2, the concrete 10 may be used for the purpose of ballast. Many, and therefore for this purpose,
Instead of concrete 10, it is possible to use other materials such as sand, stone, etc. other than concrete. Moreover, reinforcing bars are installed in concrete 6 and 10 to provide top plate 2 and bottom plate 1. Can be designed more economically.

[Effects of the Invention] According to the present invention, various excellent effects as described below can be obtained.

(I) Since it is possible to prevent corrosion of the upper plate, which is a portion where the steel material is severely corroded, the amount of steel material used can be reduced and the economic efficiency can be improved.

(II) Draft of floating body, concrete with low height of center of gravity,
Since it can be easily and accurately adjusted with sand, stone, etc., it is possible to ensure the wave-dissipating performance and also be economically advantageous.

(III) It is possible to extend the life of the floating breakwater without fear of water leakage due to cracks such as reinforced concrete and prestressed concrete floating bodies.

(IV) When manufacturing a floating body with a size and weight that exceeds the limit of a lifting machine, a steel outer shell is made on land such as a quay, and it is floated to the sea by a floating crane before placing concrete. Therefore, it is possible to manufacture a much larger floating body than the conventional floating body without using a dock, and there are fewer restrictions on the manufacturing location, and a small lifting machine is required.

(V) Unlike conventional reinforced concrete and prestressed concrete floating bodies, concrete pouring can be performed without using a formwork, which facilitates construction and reduces costs.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial sectional view of an embodiment of a floating breakwater floating body according to the present invention, and FIG. 2 is a partial sectional view of another embodiment of a floating breakwater floating body according to the present invention. Figure is a partial sectional view of an example of a conventional floating breakwater, Figure 4 is a partial sectional view of another example of a conventional floating breakwater, and Figure 5 is a general floating breakwater using a box-shaped floating body. FIG. In the figure, 1 is a bottom plate, 2 and 13 are upper plates, 3 is a water surface, 4 is a side plate, 5
Is a floating body, 6 and 10 are concrete, and 14 is an outer shell.

Claims (3)

[Scope of utility model registration request] 1. A bottom shell, a side plate, and an upper plate as well as a hollow shell made of a steel material having a box-shaped cross-section, and the draft and the height of the center of gravity of the floating body can be adjusted on the upper surface of the upper plate. A floating body of a breakwater, which is made by placing concrete of a predetermined thickness. 2. A hollow steel shell having a box-shaped cross section is formed by a bottom plate, a side plate, and an upper plate, and the draft and height of the center of gravity of the floating body are adjusted on the upper plate upper surface and the bottom plate inner surface. A floating body of a breakwater, which is made by placing concrete of a predetermined thickness so as to obtain. 3. The floating body of the floating breakwater according to claim 2, wherein a material other than concrete such as sand or stone is stored on the inner surface of the bottom plate instead of the concrete cast on the inner surface of the bottom plate.