JPS6327610A - Sea-area control structure - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sea area control structure that is installed at a location away from the shore, maintains the exchange of seawater, attenuates waves, and forms a calm area. .

(Prior Art) Conventionally, so-called breakwaters have been installed for the purpose of obtaining calm waters for fish farms, etc. in ports and bays.

Wave-dissipating caissons are often used in conventional offshore breakwaters, and when it is necessary to plan for the interaction of the ura wave action and the interaction of internal and external seawater,
A type with a large number of permeation holes is used.

(Problem to be Solved by the Invention) The ability of the Uranami caissons used in such conventional seawater exchange type breakwaters is determined by the caisson width, and the width is at least 0.15 times the wavelength. is necessary. Therefore, in order to effectively dissipate long-period swell waves, a considerably long caisson width is required, and in order to stabilize the caisson, it is necessary to fill it with sand or concrete. There was a problem in that the installation work was extensive and required a large amount of money.

In view of these conventional problems, the present invention is light and heavy, does not require a long width, is easy to install, has a high Uranami effect, and has a ttR system that actively exchanges seawater inside and outside.
The purpose is to provide area control structures.

(Means for Solving the Problems) The gist of the present invention for achieving the above-mentioned objects consists of a bottom plate supported on the seabed with piles, and a bottom plate arranged substantially parallel to each other at a distance from each other on the bottom plate. It has a partition wall that is erected and whose top end is substantially the same as or lower than the sea level, and a pair of inclined walls that are installed astride between the partition walls and whose upper sides are tilted away from each other, and the above-mentioned It consists of a sea area control structure consisting of a plurality of water passage windows opened at intervals in a slanted wall.

(Function) This sea area control structure is constructed so that when waves in a direction parallel to the bulkhead wash over the front surface, the front surface of the structure becomes uneven, with the front surface of the bulkhead and the front surface of the sloping wall alternating. The waves wrap around from side to side, collide with each other, and break.

In addition, within the width of the wave, the part above the top of the structure continues as it is, and the lower part collides with the structure and is controlled, so the top and bottom of the wave are divided and the phase shifts, causing the structure to fall. Wave dissipation is performed at the back, and the seawater inside and outside is exchanged.

Furthermore, as the waves move from a low position to a higher position on the sloped wall, an upward jet is generated from the transparent window formed in the sloped wall, increasing the turbulence and dissipating energy, and the seawater inside and outside through the transparent window. exchanges will take place.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

In the figure, reference numeral 1 indicates a precast concrete structure constituting the sea area control structure of the present invention, and this structure 1
They are arranged in sequence and installed on the seabed to form sea area control structures. The structure 1 integrally includes a bottom plate 2, partition walls 3, 3, . has been done.

Through-holes 5, 5... are formed in the bottom plate 2 at the front and rear positions, and supporting stakes 6, 6... are penetrated through these holes to provide access to the seabed 7.
The structure 1 is fixed to the seabed by driving into the seabed.

The height of the partition 13 is formed to be the same as or lower than the still water sea level of the sea area in which it is installed, and a water passage window 8 is opened in the center portion to extend from side to side.

The front and rear inclined walls 4a, 4b are installed such that both ends thereof are integrated with the spacer walls 3.3 on both sides, and the upper sides are inclined in a direction away from each other. It is preferable that the stiffness inclination angle θ is 10° to 30°. Both slanted walls 4a, 4b have a recess 9 formed at the center of the top end of the sled, with the upper part released r#, and below the recess 9, a plurality of transparent windows 10, 10... are formed at regular intervals. It is formed. The aperture ratio of the transmission windows 10, 10... and the recess 9 relative to the area of the sloped walls is
It is preferable that both amounts are 20 to 40%.

In addition, although the above-mentioned embodiment shows the case where the structure 1 is supported only by the piles 6, as shown in FIG. 12 may be used in combination with anti-6.

Next, the action of the sea area control structure configured as described above on waves will be explained.

When a wave approaches this structure from the direction of arrow a as shown in Figure 5, the top of structure 1 is at or below the still water surface, so the part above the midpoint of the wave remains as it is. It moves upwards, but the part below the middle part collides with a structure and its progress is hindered. As a result, the phase of the wave changes at the top and bottom, and the top of the wave falls into the trough d at the back of the structure.
Equalized.

Further, as shown in FIG. 6, the waves approaching the structure 1 are first divided laterally at the front surface of the structure 1 by distances N3, 3 as shown by the arrows, and are brought to the center of the inclined wall 4a.

As a result, the flowing water that has turned sideways collides with each other, and energy is dissipated in front of the inclined wall 4a.

Furthermore, as shown in FIG. 7, the waves approaching the slanted wall 4a collide with the front surface of the slanted wall 4a, causing the water level to gradually rise, causing the seawater to move upward along the slanted wall 4a. At this time, a jet flow d is generated substantially perpendicularly to the inclined surface from the transmission window 10, that is, diagonally upward, increasing turbulence and dissipating energy.

(Effects of the Invention) The present invention is constructed as described above, and by making the structure at the same level as or lower than the sea level at the top of the structure and providing a transmission window in the inclined wall, the entire wave power is transmitted to the structure. Therefore, it does not require a large width, and even a small precast M4 structure can sufficiently counter the wave force.Moreover, it is possible to divide the waves into upper and lower parts and shift the phase of the lower side. As a result, the water surface is leveled behind the structure, effectively creating a calm state.

In addition, by alternately arranging convex portions made of partition walls and concave portions made of slanted walls on the front of the structure, horizontal water flow is generated, and permeable windows are opened in the slanted walls to generate upward jets. By doing so, wave energy is effectively dissipated, and an appropriate exchange of seawater between the inside and outside is maintained, creating a sea area suitable for fish and shellfish farms.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional side view of one example, FIG. 2 is a front view of the same, FIG. 3 is an open plan view, and FIG.
The figure is a vertical sectional front view of another example, FIG. 5 is a side view showing one mode of action, FIG. 6 is a plan view showing another mode of action, and FIG. 7 is a further curved mode of action. FIG. 3 is a partially enlarged sectional view. DESCRIPTION OF SYMBOLS 1... Structure, 2... Bottom plate, 3... Partition wall, 4a,
4b...slanted wall, 6...pile, 7...z square bottom, 9...
・Concave cutout, 10... Transparent window. Patent applicant Pentayo Construction Co., Ltd. Figure 3 1: I So So Figure 4

Claims (1)

[Claims] A bottom slab supported on the seabed with piles, bulkheads erected on the bottom slab in a substantially parallel arrangement at intervals and having their tops approximately at the same level or lower than the sea level, and between the bulkheads. A sea area control structure comprising: a pair of inclined walls installed across the sea, the upper sides of which are inclined toward sides that are separated from each other; and a plurality of water passage windows opened at intervals in the inclined walls.