JPH0156956B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for reducing the influence of waves on underwater fixed structures or floating bodies such as large ships and offshore work platforms.

In the past, various methods have been proposed to reduce the horizontal motion of a floating body, but there is no method to reduce the horizontal movement of a floating body. It was. Furthermore, in the case of underwater fixed structures, there has been no means for effectively reducing wave influence.

In view of the above points, the present invention aims to provide a method that can reduce the influence of waves on underwater fixed structures or floating bodies.

In order to achieve the above object, the method of reducing wave influence on an underwater fixed structure or floating body according to the present invention provides a method for reducing wave influence on an underwater fixed structure or floating body. The movable plates are each attached via a bag filled with fluid, and a transmission means is installed to mutually transmit the force acting on the fluid in both bags, so that the wave force acting on one movable plate is transmitted to the other side. transmitting the fluid in the bag to the other movable plate via the transmission means and the fluid in the other bag;
By causing the other movable plate to generate waves, the influence of waves on the fixed structure or floating body is reduced.

According to this configuration, the wave energy received by one movable plate is transmitted to the other movable plate, and this energy moves the other movable plate to create waves, thereby reducing wave influence on fixed structures and floating bodies. This makes it possible to satisfactorily reduce damage to fixed structures and floating bodies due to powerful wave energy, to reliably prevent floating bodies from drifting, and to simplify mooring devices.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In Figures 1 and 2, 1 is a floating body;
On the outer surfaces of a pair of side walls of this floating body 1 that are parallel to each other and orthogonal to the direction of wave propagation (arrow direction in Figure 1),
Fixed plates 2 and 3 are fixed. At the lower ends of these fixed plates 2, 3, there are rotating shafts 4, 5 along the horizontal direction.
Bearings 6 and 7 are fixedly supported to rotatably support the movable plates 8 and 9, and lower ends of movable plates 8 and 9 are fixed to the rotation shafts 4 and 5, respectively. the fixed plates 2, 3 and the movable plate 8,
9 are connected by bellows-shaped first bags 10 and 11, and springs 12 and 13 are interposed between the upper ends. A bellows-shaped second bag body 14 is provided on the inner surface of the side wall of the floating body 1, and communicates with the first bag body 10, 11 through the side wall and holes (not shown) in the fixing plates 2, 3. One end of the second bag body 14, 15 is fixed, and the other end of the second bag body 14, 15 is fixed to the closure plate 16, 1.
It is blocked by 7. The first and second bags 10, 11, 14, 15 are made of rubber or soft synthetic resin, and are filled with a fluid such as water or air.
has a smaller cross-sectional area than the first bags 10 and 11.
Reference numeral 18 denotes a fluid handling device installed in the floating body 1, and cylindrical parts 18a and 18b protrude from both sides thereof, and are fitted into the cylindrical parts 18a and 18b in a watertight and slidable manner. The tips of the pistons 19 and 20 are fixed to the closing plates 16 and 17.
The fluid operating device 18 is equipped with a hydraulic fluid circuit having a switching valve and a check valve, and transmits the movement of one of the pistons 19, 20 to the other. The water surface without waves is shown in phantom lines in Figure 1. Note that instead of using the springs 12 and 13, small floating bodies may be attached to the movable plates 8 and 9.
Furthermore, the movable plates 8 and 9 may be rotated about their upper ends, or the upper and lower ends may be connected to the fixed plates 2 and 3 by springs without using the rotation shafts 4 and 5. Furthermore, the bags 10, 11, 14, and 15 do not necessarily have to be bellows-shaped.

Due to the waves in the direction of the arrow (FIG. 1), one of the movable plates 8 receives wave pressure, and one of the first bags 10 expands and contracts. Since the first bag body 10 and the second bag body 14 are in communication with each other, the second bag body 14 expands and contracts in accordance with the expansion and contraction of the first bag body 10. Piston 19 is pushed or pulled. The movement of this one piston 19 is transmitted to the other piston 20 by the fluid operating device 18, whereby the other second and first bags 15 and 11 expand and contract, and the other movable plate 9 moves to create waves. do. In other words, one movable plate 8
Using the wave energy received by the other movable plate 9
By creating waves, the floating body 1 is not subjected to wave forcing, and therefore the wave influence can be significantly reduced.

In addition, by providing a pump in the fluid handling device 18 to compensate for some energy loss when transmitting wave energy from one movable plate 8 to the other movable plate 9, the effect of reducing wave influence can be further enhanced. It is possible to increase the flow rate of the floating body, and to sufficiently prevent the floating body's mark current.

In addition, the above method is mainly carried out when the floating body 1 is stationary, and during navigation, the movable plate 8,
Although it is desirable to be able to store the 9 out of the way, this can also be done while underway.

Furthermore, it can be applied to fixed structures underwater instead of the floating body 1, and damage to fixed structures caused by wave force can be reliably prevented.

Further, when carrying out the present invention, it is not necessary to use the transmission means configured as described above, and various means can be used.

As explained above, according to the present invention, the wave energy received by one movable plate is transmitted to the other movable plate, and this energy moves the other movable plate to create waves. The influence of waves on the floating body can be effectively reduced. Therefore, it is possible to reliably prevent fixed structures and floating bodies from being damaged by powerful wave energy, and it is also possible to prevent floating bodies from drifting and to simplify the mooring device.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, of which FIG. 1 is a partially cutaway schematic front view and FIG. 2 is a schematic perspective view. 1... Floating body, 8, 9... Movable plate, 10, 11...
...First bag body, 14, 15... Second bag body, 18
...Fluid handling device.

Claims (1)

[Claims] 1. Attach movable plates to a pair of side walls of an underwater fixed structure or floating body that are parallel to each other and perpendicular to the direction of wave propagation through bags filled with fluid, and A transmission means for mutually transmitting the acting force is installed, and the wave force acting on one movable plate is transmitted to the other movable plate via the fluid in one bag, the transmission means, and the fluid in the other bag. Reduction of wave influence on a fixed structure or floating body underwater, characterized in that the wave influence force on the fixed structure or floating body is reduced by transmitting the waves to the other movable plate and creating waves on the other movable plate. Method.