JPS63236809A - Wave absorptive breakwater block and breakwater wall thereof - Google Patents

Abstract

PURPOSE:To avoid the stagnation of air in a water retarding sections by providing air holes from the water retarding section formed in a through hole to the outside of the block in a columnar block construction with a through hole. CONSTITUTION:A cast iron tube 2 to form a through hole 3 in a columnar concrete block 2 of an octagonal cross section is buried in the lengthwise direction of the block 1 to from a waves absorptive breakwater block. The through hole 3 has a bell mouth-shaped suction port 5, a throttle 6, and a water retarding section 7, and the section 7 has an air hole 13 leading to the outside of the block. The blocks 1 are stucked up to form openings 14 leading to the holes 13 between the adjacent blocks 1 to construct a breakwater wall. The stagnation of air in the water retarding section 7 can thus be prevented, the intrusion of waves 15 into the hole 3 can be improved, and the occurrence of reflecting waves toward the outside of harbor can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a wave-absorbing wave-dissipating block and a wave-dissipating wall using this block.

2. Prior Art As a conventional wave absorbing and dissipating block, for example,
As shown in rJFA No. 1-214917, it is arranged in the lateral direction from the evening side of the 5th bay to the inner side of the bay -ζ.

A through-hole extending from the outside of the bay to the inside of the bay is formed in 10 pillar-shaped blocks that can be stacked to form a wall, and this through-hole has a small-diameter constriction part and a large-diameter water retarding part. There is something configured.

According to such a device, waves passing through the interior of one through hole are attenuated due to a change in the cross-sectional area of the passage in the constriction portion and the water retarding portion.

Problems to be Solved by the Invention However, in such a conventional configuration, if the air that has passed through the constriction part enters the water retarding part, there is a risk that it will accumulate inside the water retarding part and will not be able to escape. When air accumulates in the water retarding part like this.

This air is compressed by waves attempting to advance into the through-hole from the outside of the bay, and the reaction thereof prevents the waves from advancing into the through-hole. As a result.

A problem arises in that the wave-dissipating ability decreases and the waves reflected from the block become larger, making the waves on the outside of the bay even higher.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve these problems and prevent air from accumulating in the water retarding section.

Means for Solving the Problems In order to solve the above problems, the wave absorbing and wave dissipating blocks of the present invention are arranged in a horizontal direction from the outside of the bay to the inside of the bay, and can be stacked in multiples to construct a wall. A through hole is formed in the columnar block from the outside of the bay to the inside of the bay. The block is configured to have a water retarding portion of a diameter, and a ventilation hole is passed through the water retarding portion toward the outer surface of the block.

Furthermore, one wave-dissipating wall using the wave-absorbing and dissipating blocks of the present invention can be constructed by stacking a plurality of the above-mentioned wave-absorbing and dissipating blocks such that 5g4 of the blocks are stacked so that openings with communicating ventilation holes are formed between the blocks. It is something that

Effect: According to the wave absorbing and dissipating block having the above configuration, waves propagating from the outside of the bay to the inside of the bay enter the through hole, and the energy is absorbed and dissipated due to the loss when passing through the constriction part. . Furthermore, energy is absorbed and dissipated due to the increase in the cross-sectional area of the passage when moving from the constriction part to the retarding part, and also due to collision with the inner surface of the through hole.

When air enters the retarding part from the opening at the end of the through-hole through the constriction part, this air is pushed by waves traveling from the outside of the bay into the inside of the through-hole. It is exhausted to the outside of the block through the ventilation hole.

For this reason, waves that try to enter the inside of the above-mentioned through-hole are
Progress is not inhibited by air in the retarding section. As a result, large reflected waves from the block to the outside of the bay are prevented from being generated.

Furthermore, according to the wave-dissipating wall having the above configuration, even though a plurality of wave-absorbing and wave-dissipating blocks are stacked, air is discharged from the retarding part of each wave-absorbing and wave-dissipating block to the outside of the block through the ventilation holes. teeth.

The water is reliably discharged to the outside of the wave-dissipating wall itself through the opening.

In addition, since the opening opens at the end face of the wave-dissipating wall on the outside of the bay, waves traveling from the outside of the bay enter not only the through-hole but also this opening, resulting in the generation of two reflected waves. Prevented.

Embodiment FIG. 1 shows a schematic cross-sectional structure of an embodiment of a wave absorbing and dissipating block according to the present invention.

Here, 1 is a block, which is made of columnar concrete. A cast iron pipe 2 extending in the length direction of the block l is embedded inside the block l, and this cast iron w
2 forms a through hole a.

For example, as shown in Figure 2, a large number of blocks l are piled up in the sea to form a wave-dissipating wall such as a breakwater.In this wave-dissipating wall, each block l is connected from the outside of the bay. It is arranged laterally towards the inside of the bay. In FIG.
The block 1 has a mouth-shaped suction port 5 that opens at the outer end surface 4 of the block 1. In addition, in a portion of the cast iron pipe 2 on the inner side of the bay than the suction port 5, a constricted portion 6 having a diameter smaller than that of the suction port is formed over a certain length. Further, in a portion of the cast iron pipe 2 on the inner side of the bay than the constricted portion 6, a water retarding portion 7 having a larger diameter than the constricted portion 6 is formed. The constriction part 6 and the water retarding part 7 are connected to each other via a connecting part 8, and the diameter of the connecting part 8 gradually increases from the constricting part 6 toward the water retarding part 7.

The part of the cast iron pipe 2 on the inner side of the bay than the retarding part 7 has a second connection part 9% similar to that on the outside of the bay, a second constriction part lO1, and a discharge port 12 that opens at the bay side end face 11 of the block l.
is formed.

A plurality of ventilation holes 18 are formed in a portion of the block 1 corresponding to the water retarding portion 7, passing through the 10 pipes 1 and the cast iron pipe 2, and communicating the water retarding portion 7 with the outer surface of the block 1.

As shown in FIG. 2, the block 1 has a diagonal cross section, and a wave-absorbing wall is constructed by stacking a plurality of blocks vertically and horizontally.

In this way, by ξ which makes the block l an incident angle shape,
An opening 14 extending in the length direction of the blocks l is formed between adjacent blocks l in a stacked state. FIG. 2 shows a state where the block l is broken at the water retarding portion 7, and the first ventilation hole 18 is provided in multiple stages in the circumferential direction of the cast iron pipe 2 so as to communicate the water retarding portion 7 with the opening 14.
Moreover, they are provided at a plurality of positions in the length direction of the cast iron pipe 2.

In such a configuration, if a wave advances toward the wave-dissipating wall Gζ from the outside of the wave-dissipating wall shown in FIG. The wave collides with the outer end face 4 of the bay, and energy is absorbed by this collision and the wave is dissipated. The remainder of the wave 15 enters the through hole 8 and is led to the constriction 6 via the suction opening 5. In the throttle part 6, the passage cross-sectional area is smaller than that of the bell-mouth-shaped suction port 6, so energy is absorbed and dissipated due to loss when passing through this part. Furthermore, when the wave 15 travels from the constriction part 6 toward the retarding part 7, the fluid energy held by the wave 15 is absorbed and dissipated by increasing the cross-sectional area of the passage. Furthermore, the waves are dissipated when passing through the second constriction part 10, and finally when they proceed from the discharge port 12 to the inside of the bay, the waves are dissipated due to the increase in the passage cross-sectional area ξ. At this point, the wave 15 has almost no energy. Furthermore, when the waves 15 pass through the through hole 8, they collide with the inner surface of the through hole 8, thereby absorbing energy and being dissipated.

At this time, even if air enters the retarding section 7 from the suction port 5 or the discharge port 12, this air is pressed by the waves 15 that advance from the suction port 5 into the through hole 8, and the air enters the ventilation hole 1.
8 to the opening 14 shown in FIG. and,
The aperture 14 is moved in the length direction of 10 liters, and the water is discharged to the outside of the wave-absorbing wall.

For this reason, the waves 15 do not have any ridges that would prevent them from advancing into the through hole 8 due to the air accumulated in the water retarding section 7.
The waves pass smoothly through the through hole 8 and are effectively dissipated. As a result, reflected waves from the block l toward the outside of the bay are prevented from occurring, but since the opening 14 shown in FIG. 15 is.

It will enter not only the through hole 8 but also this opening 14. That is, in the wave-dissipating wall, the aperture ratio of the end face on the outside of the bay increases by the opening 14, so that the generation of one reflected wave is significantly reduced.

In FIG. 2, since air is lighter than water and tends to accumulate in the upper part of the water retarding part 7, only the ventilation hole 18 located above the water retarding part 7 is provided.

The lower part can also be omitted. Also, in the second, of the hexagonal outer surface of block l.

Although the ventilation hole 18 was made to penetrate only the surface where the opening 14 is formed, it may be made to penetrate all six times. In this way,
When stacking the blocks 1, the water retarding part 7 can be communicated with the opening 14 without aligning the circumferential position of each block 1 as shown in FIG. becomes good.

Effects of the Invention As described above, according to the present invention, it is possible to prevent air from accumulating in the retarding section, thereby making it possible to improve the entry of waves into the first through hole, and furthermore, to prevent air from accumulating in the retarding section. The generation of reflected waves can be prevented. Also.

Special 12m According to the wave-dissipating wall of the present invention, even though a plurality of blocks are stacked, air that tends to accumulate inside the through-holes of each block is reliably discharged to the outside of the wave-dissipating wall. can do.

[Brief explanation of the drawing]

Fig. aI1 is a vertical cross-sectional view of an embodiment of the wave absorbing and dissipating block according to the present invention, and Fig. 1g2 is a partially broken view of an embodiment of the wave dissipating wall using the wave absorbing and dissipating block according to the present invention. This is a three-dimensional diagram. l...Block, 8...Through hole, 6...Aperture part,
7... Water retarding section, 1B... Ventilation hole, 14... Opening.

Claims (1)

[Claims] 1. A through hole is formed from the outside of the bay to the inside of the bay in a columnar block that is arranged laterally from the outside of the bay to the inside of the bay and can be stacked in multiples to construct a wall. death,
This through hole has a constriction part located on the outside of the bay, and a water retarding part located on the inside of the bay and having a larger diameter than this constriction part, and from the water retarding part to the outer surface of the block. A wave-absorbing wave-dissipating block characterized by having ventilation holes passed through it. 2. A through hole is formed from one end face to the other end face of the columnar block, and this through hole is connected to a constriction part located on the outside of the bay and a constriction part located on the inside of the bay from this constriction part. A wave absorbing and wave-dissipating block is configured to have a large-diameter water retarding portion, and a ventilation hole is passed through the block from the retarding portion toward the outer surface of the block, and the wave absorbing and wave-dissipating block is arranged in a lateral direction from the outside of the bay to the inside of the bay, A wave-absorbing wall using wave-absorbing and wave-dissipating blocks, characterized in that a plurality of wave-absorbing and wave-dissipating blocks are stacked so as to form an opening through which the ventilation holes communicate between adjacent blocks. 8. A wave-absorbing wall using a wave-absorbing wave-dissipating block according to claim 2, wherein the block has an octagonal cross section.