JP2002004237A - Floating type tidal current control structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the speed of a tidal current by a floating type tidal current control structure to secure safety of navigation of a small-sized boat entering and leaving a port and further, prevent deterioration of water quality in the port and cope with variation of water depth. SOLUTION: The floating type tidal current control structure 5 is constituted of a floating body 5, a tidal current control barrier 9 provided along the substantially whole length of the floating body 7, and a plurality of mooring means 11 for mooring the floating body 7 to reduce the tidal current speed in the vicinity of the port 6 by the current control barrier 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating tidal current for securing the safety of a small boat such as a fishing boat entering or leaving a relatively small port such as a fishing port facing a water channel (Seto) where the tide is fast. It relates to a control structure.

[0002]

2. Description of the Related Art Conventionally, when the front of a relatively small port, such as a fishing port, faces a water channel (Seto) where the tide is fast, small vessels such as fishing boats entering and leaving the port may be affected by the tidal current. There was a risk of contact with the structure.

[0003]

In order to avoid the above-mentioned danger, it is conceivable to extend a gravitational jetty offshore to block a fast flowing tidal current. But in that case,
External forces acting on the jetty also increase to completely block the fast flowing tide. Therefore, the cross section of the jetty becomes large, which is uneconomical. Also, if the tidal current is interrupted by a gravitational jetty, the water quality in the port will deteriorate due to the deterioration of seawater exchange.

[0004] In addition, when the water depth changes rapidly, the structural section of the jetty increases as the water depth increases, which is uneconomical. Also, in the case of a gravity type jetty, the work is often done locally and the workability is poor.

The present invention has been made in view of the above-mentioned conventional problems, and while ensuring the safety of navigation of small boats entering and leaving the port, it contributes to water quality conservation and can easily respond to changes in water depth. Yes, and there is little local construction,
It is an object of the present invention to provide a floating tidal current control structure having good workability.

[0006]

In order to achieve the above object, the present invention provides a floating body, a tidal flow control barrier provided over substantially the entire length of the floating body, and a plurality of mooring means for mooring the floating body at a predetermined position. And the tidal current control barrier reduces the tidal current velocity near the port entrance.

[0007] With the above configuration, the tidal current is blocked by the tidal current control barrier attached to the floating body, and the flow velocity in the upstream region is reduced. Since the decelerated tide flows under the tide control barrier and flows into the fishing port, it does not adversely affect fishing boats entering and leaving the port, and can safely enter and leave the port. In addition, since the flow near the sea bottom is not hindered by the tide control barrier, the water quality in the fishing port can be preserved. Also,
Since the tidal current control structure is a floating structure, it can be easily used even in a place where the water depth changes rapidly, and is economical.

On the other hand, by adjusting the tension of the offshore mooring means to allow the floating body to turn, a part of the tidal current can be guided offshore from the fishing port along the tidal current control barrier. The acting load can be reduced.

In addition, by providing the power flow control barrier with a rectifying function, the power flow speed can be reduced and the load acting on the power flow control barrier can be reduced.

[0010] Further, by arranging one or more rows of power flow control barriers, the function of reducing the power flow speed can be enhanced.

Further, by providing the tidal current control barrier obliquely with respect to the floating body, the tidal current speed can be reduced, and at the same time,
The load acting on the power flow control barrier can be reduced.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of a floating tidal current control structure according to the present invention, and FIG. 2 is a plan view of a fishing port provided with the floating tidal current control structure according to the present invention.

As shown in FIG. 2, the fishing port 1 has a gravity type 2 port.
It is surrounded by two jetties 2 and two breakwaters 3. And the front of the fishing port 1 is a fast flowing tide (Seto) a
Faces. The direction of this tide is reversed due to the ebb and flow of the tide.

The jetty 2 is constructed from a landing place or a quay (hereinafter referred to as a quay) 4 of the fishing port 1 to the offshore, and the breakwater 3 is constructed substantially parallel to the quay 4. Have been. Further, in front of the jetty 2,
The floating tidal current control structure 5 according to the present invention is installed offshore. In the drawing, reference numeral 6 indicates a port entrance.

As shown in FIG. 1, a floating tidal current control structure 5 includes a hollow floating body 7 formed in a rectangular parallelepiped shape, and a floating floating body 7.
A tidal flow control barrier 9 made of a strip-like pollution diffusion prevention film provided on the bottom surface 8 of the floating body over substantially the entire length thereof, a weight 10 attached to a lower end of the tidal flow control barrier 9 at a constant interval, and a plurality of mooring floating bodies 7 Of the chain 11. An anchor block 12 is attached to each end of the chain 11 (see FIG. 2).

As described above, when the floating tidal current control structure 5 is installed in front of the jetty 2, as shown in FIG.
Flow b by the tide control barrier 9 attached to the bottom surface 8
And the flow velocity is reduced. Decelerated tide b '
Flows into the fishing port 1 under the tidal current control barrier 9 and does not adversely affect the fishing boats 13 (see part 4) entering and leaving the port.

At this time, as shown in FIG. 4, when the floating body 7 can be turned counterclockwise, a part of the tidal current b is guided offshore along the floating body 7 and the tidal current control barrier 9, and
In addition, the load acting on the tide control barrier 9 can be reduced.

The turning of the floating body 7 can be performed by attaching an intermediate sinker 14 (see FIG. 3) in the middle of the offshore chin 11a to adjust the tension of the offshore chain 11a.

In the above description, a rectangular parallelepiped floating body is used, but the cross section of the floating body may be round, semicircular, polygonal, or the like. The floating body is made of concrete, steel, FRP,
Alternatively, a combination thereof may be used.

The tide control barrier may be a steel plate, a concrete plate, an FRP plate, a net, or the like. These plates and plates may be non-perforated, but may be provided with a number of holes to reduce the load of the tidal current and at the same time have a rectifying function.

The tidal current control barrier 9 may be mounted perpendicular to the floating body 7, but may be provided diagonally as shown by a two-dot chain line in FIG. 1 to reduce the load of the tidal current. . Furthermore, not only one tidal flow control barrier but also more than one tidal flow control barrier may be provided.

As shown in FIG. 5, the floating body 7 is provided in advance at an angle to the tidal current b, or as shown in FIG.
The same effect as when turning is obtained.

[0024]

As described above, the present invention comprises a floating body, a tidal current control barrier provided over substantially the entire length of the floating body, and a plurality of mooring means for mooring the floating body at a predetermined position. The tidal flow velocity near the port was reduced by the control barrier, so that fishing boats entering and leaving the port were not adversely affected, allowing safe entry and exit. In addition, since the flow near the sea bottom is not hindered by the tidal current control barrier, the water quality in the fishing port can be preserved. In addition, since the tidal current control structure is a floating structure, it can be easily used even in a place where the water depth is rapidly increased, and is economical.

On the other hand, by adjusting the tension of the offshore mooring means to allow the floating body to turn, a part of the tidal current can be guided offshore from the fishing port along the tidal current control barrier. The acting load can be reduced.

Further, by providing the power flow control barrier with a rectifying function, the power flow speed can be reduced, and at the same time, the load acting on the power flow control barrier can be reduced.

Further, by arranging one or more rows of the power flow control barriers, the function of reducing the power flow speed can be enhanced.

Further, by providing the tidal current control barrier obliquely to the floating body, the tidal current speed can be reduced, and at the same time,
The load acting on the power flow control barrier can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view of a floating power flow control structure according to the present invention.

FIG. 2 is a plan view of a fishing port on which the floating tidal current control structure of the present invention is installed.

FIG. 3 is an explanatory diagram of power flow control by a floating type power flow control structure of the present invention.

FIG. 4 is an explanatory diagram of a fishing port whose tide is controlled by the floating tidal current control structure of the present invention.

FIG. 5 is a side view showing another installation method of the floating tidal current control structure according to the present invention.

FIG. 6 is a plan view showing another shape of the floating body.

[Explanation of symbols]

 6 Port entrance 7 Floating body 9 Tidal control barrier 11 Mooring means

Claims (5)

[Claims] 1. A floating body, a tidal current control barrier provided over substantially the entire length of the floating body, and a plurality of mooring means for mooring the floating body at a predetermined position. A floating tidal current control structure characterized by reduction. 2. The floating tidal current control structure according to claim 1, wherein the tension of the offshore mooring means is adjusted to enable the floating body to turn. 3. The floating tidal flow control structure according to claim 1, wherein the tidal flow control barrier has a rectifying function. 4. The floating power flow control structure according to claim 1, wherein one or more power flow control barriers are juxtaposed. 5. The floating tidal current control structure according to claim 1, wherein the tidal current control barrier is provided vertically or obliquely to the floating body.