JPH0534448B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to improvements in caissons, and more particularly to improvements in wave-dissipating caissons.

[Prior art and its problems to be solved]

BACKGROUND ART Conventionally, caisson-type breakwaters that utilize caissons have been widely adopted as breakwaters such as vertical breakwaters or mixed breakwaters.

This type of breakwater has excellent wave resistance, can save construction costs by appropriately adjusting the material of the caisson filling, and has the advantage of being reliable in construction.On the other hand, it is constructed as an upright wall. This caused the inconvenience of reflecting the waves as they were.

Therefore, a wave-dissipating caisson was proposed in which the waterfront surface of the upright wall has a special configuration so that the energy of the waves is attenuated by frictional resistance when the colliding waves flow along the structural surface. However, this type of wave-dissipating caissons had a problem in that the desired wave-dissipating performance could not be expected because the attenuation effect in the wave depth direction was low.

[Means for solving problems]

Therefore, in this invention, a wave water energy damping chamber with an open front surface is formed in the front side of the caisson body, and a wave water branching member having a curved front surface is provided along the depth direction of the front surface opening of the damping chamber. By arranging horizontal racks at predetermined intervals and further forming a wave water reflecting section that curves continuously along the depth direction on the damping chamber wall facing the front opening, the damping effect on waves in the depth direction can be achieved. The aim is to improve the

In this case, the setting positions of the wave water branching member and the continuous part of the curved surface on the side part of the damping chamber are aligned, and the wave water branching member and the continuous curved part are integrally connected by the partition wall, and By opening water holes in the partition wall, the damping effect can be further improved.

In addition, it is preferable to make the reflecting part tilt backward with respect to the direction of wave water ingress and to arrange the wave water branching members in a diagonal lattice pattern. It is possible to improve the stability of the device itself.

[Effect]

In the wave-dissipating caisson according to the present invention, the wave water that enters the attenuation chamber through the gap of the wave water branching member is reflected by the curved reflecting portion and swirls due to the frictional resistance with each curved surface, and its energy is effectively used. Since such flow also occurs in the plane of the caisson body, the mutual action of these causes the wave to be rapidly attenuated and dissipated.

〔Example〕

Next, preferred embodiments of the wave-dissipating caisson according to the present invention will be described in detail below with reference to the accompanying drawings.

1 to 3, the wave-dissipating caisson according to the present invention has a caisson main body 12 having a filling part 10.
Energy attenuation chamber 1 with an open front at the front upper part of the
4 is provided, and this damping chamber 14 is partitioned by vertical walls 16 erected at predetermined intervals.

Wave water branching members 20 having curved front surfaces 18 are arranged at predetermined intervals in the depth direction of the front opening of the damping chamber 14, and the wall facing the front opening is inclined rearward. A wave water reflecting section 24 consisting of a continuous body of a plurality of curved surfaces 22 is formed in the depth direction of the section. In this case, the positions of the branching member 20 and the continuous portion 26 of the curved surface 22 are aligned, and the separated portion thereof is connected via the partition wall 28, and a water passage hole 30 of a predetermined shape is opened in the partition wall 28.

In addition, in FIG. 3, reference number 32 indicates the damping chamber 1.
This is a small-volume filling chamber located below 4.

Next, the function of the wave-dissipating caisson constructed as described above, particularly the function in the depth direction, will be explained.

That is, the incident wave water collides with the curved front surface 18 of the wave water branching member 20 and the front surface of the vertical wall 16 disposed in the open front part of the damping chamber 14, while colliding with the front surface of the vertical wall 16.
go inside. In this case, the wave water has a curved front surface 18
It is smoothly branched along the flow direction and collides with the reflecting part 24 with an increased flow velocity. Therefore, it goes without saying that it is preferable that the front surface of the vertical wall 16 is also formed into a curved shape.

The wave water that collides with the reflection section 24 in the attenuation chamber 14, that is, each curved surface 22, is further distributed vertically along the curved surface and not only collides with other wave water that enters later. Partition wall 28
Although the flow also swirls in the vertical direction through the water passage hole 30, such a flow has an extremely high flow velocity;
Moreover, since the wave water and the attenuation chamber 1 are rotated independently in a space surrounded by each vertical wall 16,
Frictional resistance with the curved surfaces 22 and the like in the wave water increases, and the energy of the wave water is effectively attenuated.

This type of flow also takes place in the horizontal plane surrounded by each vertical wall 16 of the damping chamber 14, ie in the horizontal direction of the wave water. In other words, the energy of the incoming wave water is dispersed by swirling flow or dispersion both in the horizontal portion and between each vertical wall 16 and the side wall facing the front opening. Therefore, in the attenuation chamber 14, together with the effect of the swirling flow in the depth direction, the wave energy is attenuated rapidly and as much as possible.

On the other hand, FIGS. 4 to 6 show another embodiment of the wave-dissipating caisson according to the present invention in which the partition wall 28 in the previous embodiment is omitted and the entire front side of the caisson body 12 is configured as a damping chamber 14. However, in this case as well, not only the same effect as described above is achieved, but also the superstructure wall 3 is provided at the top of the damping chamber 14 of the caisson body 12.
4, it is possible to berth a ship, moor a ship, or carry out cargo handling operations, and the structure can be simplified.

Further, in FIGS. 7 to 9, the partition wall 28 is omitted as in the previous embodiment, but the branching members 20 are arranged in a diagonal lattice pattern, and the filling chamber 32 is filled with rubble, wave-dissipating blocks, etc. This is yet another embodiment of the wave-dissipating caisson according to the present invention, in which the filling material 36 made of is installed in the shape of an inclined embankment, and in this case, it is possible to improve the workability and increase the strength.

[Effects of the Invention] As described above, the wave-dissipating caisson according to the present invention can effectively attenuate the energy of wave water in the depth direction with a simple structure, and therefore, It has various advantages such as high wave-dissipating ability and good economical effects.

Although the preferred embodiments of the wave-dissipating caissons according to the present invention have been described above, the present invention is not limited to these embodiments. The curvature, separation distance, etc. of the curved front surface and reflective surface of the branching member can be set as appropriate depending on various conditions such as wave conditions, topography, and tidal currents, and the curved surface can be made into a polygonal surface within the limits that are permissible in terms of hydraulic effects. Of course, various design changes can be made without departing from the spirit of the present invention, such as configuring it as .

[Brief explanation of the drawing]

FIG. 1 is a plan view of a preferred embodiment of the wave-dissipating caisson according to the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a cross-sectional view taken along the line -- of FIG. FIG. 5 is a front view of FIG. 4, FIG. 6 is a cross-sectional view taken along the - line in FIG. 5, and FIG. 7 is a plan view of another embodiment of the wave-dissipating caisson according to the present invention. A plan view of yet another embodiment, FIG. 8 is a front view of FIG. 7,
FIG. 9 is a sectional view taken along the line -- in FIG. 8. 10: Filling section, 12: Caisson body, 14: Damping chamber, 16: Vertical wall, 18: Curved front surface, 20:
Wave water branching member, 22: Curved surface, 24: Wave water reflection portion, 26: Continuous portion, 28: Partition wall, 30: Water hole, 32: Filling room, 34: Wall for superstructure, 36:
Filling material.

Claims (1)

[Scope of Claims] 1. A wave water branching member that forms a wave energy damping chamber with an open front surface in the front side of the caisson body, and has a curved front surface along the depth direction of the front open portion of the damping chamber. A wave-dissipating caisson characterized in that the wave-dissipating caissons are horizontally arranged at predetermined intervals, and a wave-water reflecting section that is continuously curved in the depth direction is formed on the damping chamber wall section facing the front opening section. 2 Aligning the setting positions of the wave water branching member and the continuous portion of the curved reflecting surface on the damping chamber wall portion, and integrally connecting the wave water branching member and the continuous portion via the partition wall, and furthermore, The wave-dissipating caisson according to claim 1, which comprises water holes formed in the wall. 3. The wave-dissipating caisson according to claim 1 or 2, wherein the reflecting portion is tilted rearward with respect to the wave water introduction direction. 4. The wave-dissipating caisson according to any one of claims 1 to 3, wherein the wave water branching members are arranged in a diagonal grid pattern. 5. The wave-dissipating caisson according to any one of claims 1 to 4, wherein a filling part is disposed below the damping chamber.