JPH09158152A - Arch type floating breakwater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for troublesome work by forming a levee body in an arch type floating structure. SOLUTION: A plurality of box-shaped floating bodies 2 are interconnected with each other and floated in the form of an arch, thereby forming a levee 1. Both ends of this levee 1 are provided on a sea bottom ground 3 and supported on a pile type fixed structure where water 7 is sealed between each floating body 2 and the sea bottom ground 3 and a plurality of rubber-made dampers 6 are interposed between them, thereby resisting against waves surging from the open sea (a) with the arch effect produced by the pile type fixed structure and the levee 1 and contriving the purification of sea water by distributing sea water under the levee 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breakwater, and more particularly to a floating breakwater having an arch type floating structure as a breakwater body.

[0002]

2. Description of the Related Art A conventional breakwater is a gravity type one in which caissons are continuously installed on a rubble mound formed on the seabed, and each caisson is filled with a filling material to stabilize it, or is cast on the seabed ground. A legged type in which a frame was assembled in a cross-shaped manner on a large number of piles was generally used.

[0003]

However, according to the above-mentioned conventional breakwater, in the case of the gravity type, not only a great amount of time and cost are required to construct the rubble mound, but in some cases, the foundation for ground improvement etc. On the other hand, in the case of the legged type, on the other hand, not only a large number of large piles have to be driven, but also a lot of man-hours are required for assembling the frame to these piles, and in any case, the breakwater There is a problem that it takes a long time to build and a great deal of cost.

The present invention has been made in view of the above-mentioned problems of the prior art. The problem is that the levee body has a floating structure, which eliminates the need for troublesome construction, thereby shortening the construction period and reducing the construction cost. It is to provide a floating breakwater that greatly contributes to the reduction of

[0005]

In order to solve the above-mentioned problems, the present invention relates to a plurality of box-shaped floating bodies which are connected to each other and float in an arch shape to form a bank, and the bank is formed by a convex surface of the arch. Is arranged so as to face the incoming wave direction, and both ends of the bank are supported by a fixed structure.

In the arch type floating breakwater constructed as described above, by forming the levee body from a box-shaped floating body, it is not necessary to construct a rubble mound and ground improvement as in the gravity type, and the legged type breakwater is used. It eliminates the need for multiple stakeouts and frame assembly as in. In addition, the movement of the bank is restricted by the connection between the fixed structure and the floating body at both ends, and the wave effect resists the arch effect of the entire bank, so it is sufficiently stable even for large wave forces. Sex is secured.

In the present invention, the fixed structure for supporting both ends of the dam body may be a pile type structure cast on the seabed, and when extending the dam body from an existing revetment, One of the fixed structures can be reveted. If the fixed structure is a pile type structure, it will be more stable in strength, and if one of the fixed structures is an existing revetment, the construction period will be further shortened.

As the floating body, it is desirable to use one having a sufficient width to allow the passage of the vehicle, which enables effective use of the breakwater.

According to the present invention, a plurality of rubber dampers may be interposed at a predetermined interval between each floating body and the seabed, and in this case, the rubber dampers are used to form the floating body. Since swaying is suppressed, it can be applied stably even in sea areas with poor sea conditions. Then, a liquid can be further enclosed inside the rubber damper, and in this case, the capability of the damper is increased and the swing of the floating body is further suppressed.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a levee body in which a plurality of box-like floating bodies 2 made of reinforced concrete are connected to each other and floated in an arch shape. The levee body 1 has its arch convex surface on the open sea a. The pile structure (fixed structure) 4 placed on the seabed 3 is supported at both ends. In the present embodiment, the bank 1 is continuously installed with an appropriate span, and the pile structure 4 between adjacent spans is commonly used to support the two banks 1. Floating body 2
Has a width W of 5 to 10 m and a length L of 15 to 30 m as an example. These are manufactured in a factory and then carried into an installation site to be described later (see FIGS. ) Will be connected to each other. Although it is desirable to provide the tide wall 5 on the floating body 2 at the edge portion on the side of the open sea a, even if the tide wall 5 is integrally formed when the floating body 2 is manufactured, You may make it attach after setting.

Reference numeral 6 denotes a rubber damper interposed between each floating body 2 and the seabed 3, and here, two rubber dampers are provided in the widthwise direction and three in the lengthwise direction, a total of six dampers. It is arranged.
Each damper 6 has a bag shape, and water 7 is enclosed in the inside thereof. The damper 6 is suspended and supported on the bottom surface of the floating body 2 in advance, and the damper 6 bottoms on the seabed ground 3 at the same time when the floating body 2 is installed. The floating body 2 has its upper surface projected above the sea surface and maintains a horizontal state by the buoyant force applied to itself and the elastic force of the damper 6.

According to this breakwater, the levee body 1 has an arch shape, and the pile structures 4 at both ends of the levee body 1 resist the movement of the floating body 2 against waves rushing from the open sea a. Therefore, the mutual connection of the floating bodies 2 can be a simple structure that can cope with the ebb tide from the inland sea b. 4 and 5 show such a connecting structure. In the one shown in FIG. 4, the key 10 is provided on the end surface of one floating body 2 and extends longitudinally on the end surface of the other floating body 2. A key method of fitting in the key groove 11 is adopted, and in the one shown in FIG. 5, a prestress method of tensioning the floating bodies 2 with each other by a prestress wire or a steel rod 12 is adopted. In addition to this, it goes without saying that a bolt joining method in which the floating bodies 2 are fastened together with bolts and nuts can be adopted.

On the other hand, the pile structure 4 can have a structure as shown in FIG. 6 as an example. That is, the pile structure 4 includes a plurality of steel pipe piles 13 placed on the seabed 3 and a concrete column 1 placed so as to surround the steel pipe piles 13.
It consists of four. Concrete pillar 14 is steel pipe pile 1
After the 3 is cast, it can be formed by surrounding it with a sheet pile wall and casting concrete in the sheet pile wall in situ. In addition, it is desirable to embed a means for connecting with the floating body 2, for example, an anchor (not shown) in the concrete pillar 14.

In the floating breakwater constructed as described above, the movement of the levee body 1 is restricted by the connection between the pile structures 3 and the buoyant bodies 2 at both ends thereof, and the arch of the entire levee body 1 is protected against the wave force. The rubber damper 6 that encloses the water 7 suppresses the swinging of the floating body 2 by the effect, and therefore the floating body 2 is sufficiently resistant to installation in a sea area where the sea condition is severe such that a large wave rushes. Further, since the lower side of the bank 1 has a permeable structure, seawater flow is promoted between the outer sea a and the inner sea b, and water quality deterioration of the inner sea b can be prevented in advance.
It is suitable as a breakwater facility for recreational beaches. Further, since the upper surface of the bank 1 has a width (width) sufficient to allow the passage of vehicles, it can be used for various purposes such as a pier or a fishing ground.

In the above embodiment, the bank 1 is continuously installed with an appropriate span, but the present invention may be implemented as a single span system. FIG. 7 shows an embodiment in which such a single span method is used. Here, the existing revetment 15 is used as one of the fixed structures, and one end of the bank 1 is supported by this revetment 15. I am letting you. In this case, it is not necessary to drive the above-mentioned pile structure 4 at two places on the left and right of the dam body, so that the construction can be completed in a short period of time.

The fixed structure for supporting both ends of the dam body 1 is replaced by the pile structure 4 described above, for example, a gravity type one such as a caisson filled with a filling material, or is placed on the seabed. It is possible to use a legged type in which a frame is assembled like a cross on the pile. The rubber damper 6 can be omitted in the sea area where the sea condition is favorable. Further, instead of using the rubber damper 6, for example, a so-called water ballast in which the inside of the floating body 2 is partitioned into a plurality of chambers and water is pumped to adjust the ballast can be adopted.

[0018]

As described above in detail, according to the arch type floating breakwater according to the present invention, it is of course not necessary to construct a rubble mound or ground improvement as in the gravity type, but to use the leg type. This eliminates the need for a large number of piles and assembling of the frame, which makes it possible to significantly reduce the construction period and cost. Further, since the lower side of the bank is a permeable structure, the exchange of seawater between the open sea and the inland sea is promoted, which greatly contributes to the purification of seawater in the inland sea.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing the structure of an arch type floating breakwater according to the present invention.

FIG. 2 is a cross-sectional view of a levee body forming the arch type floating breakwater.

FIG. 3 is a side view of a levee body forming the arch type floating breakwater.

FIG. 4 is a plan view schematically showing an example of a combined structure of floating bodies.

FIG. 5 is a plan view schematically showing another example of the floating body coupling structure.

FIG. 6 is a plan view of a pile structure that constitutes the arch type floating breakwater.

FIG. 7 is a plan view schematically showing another embodiment of the arch type floating breakwater.

[Explanation of symbols]

 1 Embankment 2 Floating Body 3 Seabed 4 Pile Structure (Fixed Structure) 5 Seawall 6 Rubber Damper 7 Water 15 Seawall

Claims (6)

[Claims] 1. A plurality of box-shaped floating bodies are connected to each other and floated in an arch shape to form a bank body, and the bank body is arranged such that the convex surface of the arch faces the direction of incoming waves. An arch-type floating breakwater, in which both ends of the are supported by fixed structures. 2. The arch type floating breakwater according to claim 1, wherein the fixed structure is a pile type structure cast on the seabed. 3. The arch type floating breakwater according to claim 1, wherein one of the fixed structures comprises an existing revetment. 4. The arch type floating breakwater according to claim 1, wherein the floating body has a width sufficient to allow passage of a vehicle. 5. The arch according to any one of claims 1 to 4, wherein a plurality of rubber dampers are provided at a predetermined interval between each floating body and the seabed. Floating breakwater. 6. The arch type floating breakwater according to claim 5, wherein a liquid is enclosed in a rubber damper.