JPH0437943Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a wave absorption/dissipation block.

BACKGROUND TECHNOLOGY As a conventional wave absorbing/dissipating block, Tetrapod (registered trademark) is commonly used. It consists of a star-shaped concrete block with four protrusions forming an angle of 120 degrees with each other, and the embankment body is constructed by stacking multiple blocks.

Problems that the invention aims to solve: However, in conventional blocks like this, the energy from waves colliding with the block is absorbed and the waves are dissipated. The problem is that it reaches the land. Furthermore, the conventional blocks described above have the problem that the flow of water is inhibited, resulting in stagnation and the organic matter is likely to rot.

Therefore, the object of the present invention is to solve these problems and provide a wave absorbing/dissipating block that can prevent the generation of wave splash and ensure sufficient flow of water.

Means for Solving the Problems In order to solve the above problems, the present invention forms a through hole in the length direction of the block in an elongated columnar block, and a hole is formed in the through hole along the length direction of the block. , a plurality of diaphragm structures with a small cross-sectional area and a plurality of water retarding structures with a large cross-sectional area are provided alternately.

Function According to this configuration, since the through holes for wave dissipation are formed in the length direction of the elongated columnar block,
By arranging and stacking a plurality of blocks in a horizontal direction from the outside of the bay to the inside of the bay, an embankment body with excellent wave-dissipating performance can be easily constructed. Waves propagating from the outside of the bay toward the inside of the bay enter the through-hole, and the energy is absorbed and dissipated by the pressure difference between the upstream and downstream sides created by the throttle structure with a small cross-sectional area. Furthermore, energy is also absorbed and dissipated due to the increase in the passage cross-sectional area when moving from the throttle structure with a small cross-sectional area to the large water retarding structure and due to collision with the inner surface of the through hole.
In addition, since there are a plurality of stages of the diaphragm structure with a small cross-sectional area and a large water retarding structure with a large cross-sectional area, waves are dissipated one after another in each stage. According to this,
Waves do not collide with a rigid body, but are dissipated while passing through the through hole, thereby preventing the generation of wave splash. Further, as the waves pass through the through hole, a water flow is generated inside the through hole, thereby preventing the occurrence of stagnation.

Embodiment FIGS. 1 and 2 show a schematic cross-sectional structure of an embodiment of a wave absorbing and dissipating block based on the present invention. Here, 1 is a block, which is made of concrete in the shape of a rectangular prism with a square cross section. This block 1 is inside block 1.
A cast iron pipe 2 extending in the length direction is embedded, and a through hole 3 is formed by this cast iron pipe 2. As shown in FIG. 3, a large number of blocks 1 are piled up in the sea to construct an embankment body 4 such as a breakwater. In this embankment body 4,
Each block 1 is arranged laterally from the outer side 5 of the bay to the inner side 6 of the bay.

In FIG. 1, the through hole 3 formed by the cast iron pipe 2 has a bellmouth-shaped suction port 8 that opens at the outer end surface 7 of the block 1. As shown in FIG. On the inside of the bay from this suction port 8, there is a bench lily portion 9 whose diameter gradually decreases from the outside of the bay toward the inside of the bay.
is formed, and at the rear end of this bench lily part 9, there is a throat part 1 as a narrowing structure with a small cross-sectional area.
0 is formed. The bench lily portion 9 is formed into a cone shape such that the angle α between its inner surface and the axis 11 of the block 1 is in the range of 0 to 45 degrees.
In a portion of the cast iron pipe 2 on the inner side of the bay than the throat portion 10, a water retarding portion 12 is formed as a water retarding structure portion having a larger diameter and a larger cross-sectional area than the throat portion 10. The throat portion 10 and the water retardation portion 12 are connected via a connecting portion 13, and this connecting portion 13 is formed in a cone shape as shown in the figure or a hemispherical shape. In FIG. 1, the angle β between the inner surface of the connecting portion 13 and the axis 11 can be set appropriately.

The part of the cast iron pipe 2 on the inner side of the bay than the water retarding part 12 has a second bench lily part 9a similar to the above,
Second throat portion 10a and second connecting portion 13
a is formed, followed by a second water retarding section 12a.
is formed. Further, similarly, the third
bench lily portion 9b, third throat portion 10b,
A third connecting portion 13b and a third water retarding portion 12b are formed. The part of the cast iron pipe 2 on the inside of the bay from the third water retarding part 12b includes a fourth connecting part 13c, a fourth throat part 10c, a fourth bench lily part 9c, and an end face 14 on the inside of the bay of the block 1.
A discharge port 15 that opens at is formed.

In the above, the cast iron pipe 2 has a circular cross section, but a square cross section or other pipes may also be used. In addition, in FIG. 2, the block 1 having a square cross section is illustrated, but
Other cross-sectional shapes may also be used. Furthermore, block 1
Throat part 10... and retarding part 1 in the length direction of
The number of 2... may be any other appropriate number in addition to the above.

FIG. 3 shows a cross-sectional structure of a breakwater body 4 constructed as a breakwater by stacking a plurality of the above-mentioned wave absorbing and dissipating blocks vertically and horizontally in the sea. Here, reference numeral 17 denotes a concrete base installed on the seabed, and a concrete foundation block 18 is stacked on top of this base 17, and a plurality of blocks 1 are stacked on top of this foundation block 18. .

In such a configuration, the embankment body 4 shown in FIG.
When a wave 19 advances from the outer side 5 of the bay towards this embankment body 4, a part of this wave 19 collides with the outer end face 7 of the block 1, and energy is absorbed by this collision and the wave is dissipated. do. Of the waves 19, those that do not collide with the end face 7 of the block 1 reach the retarding section 12 from the suction port 8 in FIG. Then,
Due to the pressure difference between the outside of the bay and the inside of the bay that occurs in the throat portion 10, the energy is absorbed and dissipated.
Furthermore, energy is absorbed and dissipated due to the increase in the passage cross-sectional area when moving from the throat portion 10 to the retarding portion 12 and the collision with the inner surface of the through hole 3.

Thereafter, the wave moves to the second throat portion 10a, the second
water retardation part 12a, third throat part 10b, third
The waves are further dissipated by passing through the retarding section 12b and the fourth throat section 10c. Then, it is guided from the discharge port 15 to the inner side of the bay 6, where it is also dissipated by the increase in the cross-sectional area of the passage, and becomes in a state where it retains almost no energy.

In this way, since the waves 19 are dissipated while passing through the through hole 3, it is possible to dissipate the waves while preventing the generation of splashes. In addition, the wave 19 is
As the water passes through the through hole 3, a water flow is generated inside the through hole 3, so that stagnation in the embankment body 16 is prevented.

In the embankment body 4 shown in Fig. 3, simple concrete foundation blocks 18 are provided in areas deep underwater that are not affected by waves 19, and wave dissipating blocks are not installed in these areas. It reduces costs.

4 and 5 show schematic cross-sectional structures of other embodiments of the wave absorbing and dissipating block according to the present invention. In this example, between the suction port 8 and the discharge port 15 formed at both ends of the block 1, there is a small diameter portion 20 as a throttle structure with a small cross-sectional area and a large diameter portion as a water retarding structure with a large cross-sectional area. 21 are formed alternately. According to such a configuration, wave cancellation is performed in the same manner as shown in FIGS. 1 and 2.

Effects of the invention As described above, according to the invention, the through holes for wave dissipation are formed in the length direction of the elongated columnar blocks. Just by piling them up, an embankment body with excellent wave-dissipating performance can be easily constructed. In addition, it is not only possible to dissipate waves well without generating wave splash and while ensuring water flow, but also to have a constriction structure with a small cross-sectional area inside the through hole. Since the water retarding structures with large cross-sectional areas are alternately provided in multiple stages, effective wave dissipation can be performed one after another in each stage due to the interaction between these aperture structures and the water retarding structures.

[Brief explanation of the drawing]

Figure 1 is a sectional view of an embodiment of the wave absorbing and dissipating block based on the present invention, Figure 2 is a sectional view taken from Figure 1, and Figure 3 is constructed using the blocks shown in Figures 1 and 2. Sectional view showing the embankment body, No. 4
The figure is a sectional view of another embodiment of the wave absorbing wave-dissipating block based on the present invention, and FIG.
FIG. 1... Block, 3... Through hole, 4... Embankment body,
5...Outside the bay, 6...Inside the bay, 10, 10a, 1
0b, 10c...Throat part (throttle structure with small cross-sectional area), 12, 12a, 12b... Water retarding part (water retarding structure with large cross-sectional area), 20... Small diameter part (throttle structure with small cross-sectional area) , 21...Large diameter part (water retarding structure part with a large cross-sectional area).

Claims (1)

[Scope of utility model registration request] A through hole is formed in the elongated columnar block in the length direction of the block, and a throttle structure with a small cross-sectional area and a water retarding structure with a large cross-sectional area are formed in this through hole along the length direction of the block. A wave-absorbing and wave-dissipating block characterized by a plurality of wave-absorbing and wave-dissipating blocks being provided alternately.