JPH0544482B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to wave absorbing and dissipating blocks.

BACKGROUND TECHNOLOGY Tetrapod (registered trademark) is commonly used as a conventional wave absorbing and dissipating block. 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 to be Solved by the Invention However, in such conventional blocks, when waves collide with the blocks, energy is absorbed and 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 purpose of the present invention is to solve these problems and provide a wave absorbing and dissipating block that can prevent the generation of wave splashes, allow water to flow sufficiently, and has good manufacturability. do.

Means for Solving the Problems In order to solve the above problems, the present invention is arranged in a lateral direction from the outside of the bay to the inside of the bay, and
A through-hole extending from the outside of the bay to the inside of the bay is formed inside a columnar concrete block that can be stacked to form a bank body, and a sleeve is fitted inside at least the end of the through-hole outside the bay. , the sleeve has a suction port that opens at the end face of the block, a small diameter portion that is formed on the back side of the suction port and has a smaller diameter than the through hole, and a small diameter portion that is formed on the back side of the small diameter portion. A connecting portion is provided to connect the small diameter portion and the inner surface of the through hole.

Effects According to such a configuration, waves propagating from the outside of the bay toward the inside of the bay are guided from the suction port of the sleeve to the small diameter portion, then pass through the through hole after passing through the connection portion. At this time, the waves are easily guided to the small diameter part by the action of the suction port, and are propagated inside the through hole while being subjected to a wave-dissipating effect by colliding with the inner surface of the small diameter part. Inside the through-hole, the cross-sectional area of the passage is increased compared to the small-diameter portion of the sleeve, thereby absorbing energy and ensuring reliable wave dissipation. Wave dissipation also occurs when waves collide with the inner surface of the through hole.

According to the above, the waves do not collide with a rigid body, but are dissipated while passing through the through hole, so that the generation of wave splash is effectively prevented. Also,
As waves pass through the through hole, a water flow is generated inside the through hole, thereby preventing stagnation from occurring.

When manufacturing this wave-dissipating block, it is only necessary to fit and fix the sleeve into at least the outer end of the through hole, which is formed by pouring concrete around the metal tube. A wave-dissipating hole whose cross-sectional shape changes along the length direction can be easily formed.

Note that the inner end of the through hole can be fixed with a sleeve similar to the one described above, or a constricted part with the same shape as the sleeve can be formed using a hardening material such as concrete or resin mortar. It's okay. Alternatively, the open end of the through hole may be directly communicated with the inside of the bay.

Embodiment FIGS. 1a, b, and c show an embodiment of a wave absorbing and dissipating block 1 according to the present invention.
Here, 2 is a block, which is made of concrete in the shape of a square prism. Inside the block 2, there is a cast iron pipe 3 extending along the length of the block 2.
is embedded, and the through hole 4 is formed by this tube body 3.
is formed. The tube body 3 has a socket 5 at the end outside the bay of the block 2, and an inlet 6 at the end inside the bay, and has a mortar lining layer 7 on its inner surface for corrosion prevention. It is formed.

A cast iron sleeve 8 is attached to the outer end of the tube body 3.
is embedded. This sleeve 8 includes a bellmouth-shaped suction port 10 that opens at the end surface 9 on the outside of the bay of the block 2, and a small diameter portion 11 that is formed on the inside of the bay from the suction port 10 and has a smaller diameter than the tube body 3.
This small diameter portion 11 is located on the inner side of the bay than the small diameter portion 11.
and a connecting portion 12 that connects the inner surface of the tube body 3. The back surface of the suction port 10 is in contact with the open end of the socket 5 of the tube body 3, and the open end of the connecting portion 12 is in contact with the inner surface of the tube body 3.

An annular space 13 formed between the sleeve 8 and the tube body 3 has an inlet 1 formed through the tube body 3.
4 is filled with concrete 15. Further, a protrusion 16 that protrudes radially inward is formed in a portion of the tubular body 3 corresponding to the annular space 13 by a press or the like, and the tubular body 3 and concrete 15 are combined to form a sleeve 8.
and are prevented from slipping out in the axial direction.

A constricted portion 17 having a smaller diameter than the inner diameter of the tube 3 is formed over a certain length at the inner end of the tube 3, that is, inside the insertion port 6. This aperture part 1
Reference numeral 7 denotes a bell-mouth-shaped discharge port 19 that is made of a hardening material such as concrete or resin mortar and opens at the inner end surface 18 of the block 2.
It is equipped with On the rear end side of the aperture part 17, there is a tube body 3.
A connecting portion 20 is formed that smoothly expands in diameter toward the inner surface.

Since the concrete block 2 is formed in the shape of a square prism, its outer surface has four side surfaces 21,
22, 23, and 24 appear. one aspect 2
At both ends of the block 2 in the length direction,
A convex portion 25 having a constant height is formed over a certain range. This convex portion 25 is formed over the entire width of the side surface 23. A concave portion 26 corresponding to the convex portion 25 is formed on the side surface 21 located on the opposite side to the side surface 23 on which the convex portion 25 is formed, so that when a plurality of blocks 2 are arranged side by side, the adjacent blocks 2 The convex portion 25 and the concave portion 26 are configured to fit into each other. Similarly, the side surface 22 has a pair of protrusions 2 at the center in the length direction of the block 2.
5, and a pair of recesses 26 are formed on the side surface 24 at corresponding positions.

FIG. 2 is a cross-sectional view of a breakwater 27 as a breakwater body constructed by stacking a plurality of wave-dissipating blocks 1 vertically and horizontally. Here, 28 is a foundation installed on the seabed, and the upper surface 29 of this foundation 28 is
is formed with an upward slope from the outer side 30 of the bay to the inner side 31 of the bay. Wave dissipation block 1
are stacked on top of the upper surface 29 of the base portion 28, so that they are similarly inclined. Further, when stacking, the convex portions 25 and recesses 26 of adjacent wave-dissipating blocks 1 are fitted into each other to firmly connect each wave-dissipating block 1 to each other. Above the wave dissipating block 1 at the top,
An upper mounting part 32 is disposed, and its upper surface 33 is formed horizontally so as to allow passage of people and the like.
These upper portions 32 and the base portion 28 also have convex portions 25.
A recess 26 is formed, and a recess 26 of the wave dissipating block 1 is formed.
6 and the convex portion 25.

FIG. 3 is a view showing the inside or outside side of the breakwater 27 having a configuration similar to that shown in FIG. 2. As shown, each wave-dissipating block 1
The end mirrors are arranged and stacked in a diamond shape. By adopting such a stacked structure, stress in the vertical direction can be dispersed laterally, so that a breakwater 27 with excellent strength can be obtained.

When manufacturing the wave dissipating block 1 shown in FIG.
The block 2 is formed by covering the tubular body 3 with a formwork and pouring concrete into the formwork. At this time, concrete 15 is simultaneously poured into the annular space 13 through the injection port 14. Or without providing the injection port 14,
The annular space 13 may be left as a cavity, in which case the sleeve 8 is fixed to the tube body 3 by welding or the like. Finally, the constricted portion 17 is formed. At this time, a tube-shaped or round bar-shaped mold is inserted into the insertion port 6 of the tube body 3, and concrete or resin mortar is placed between this mold and the tube body 3. What is necessary is to fill the material with a hardening property of . By filling the connecting portion 20 in this manner, the material protrudes from the end of the mold, and the connecting portion 20 naturally takes on a curved cross-sectional shape as shown in the figure.

The cast iron surfaces of the tube body 3 and the sleeve 8 can be anticorrosion-protected by zinc spraying or the like, or painted to prevent algae from adhering to them. Also, since a metal tube 3 is embedded in the block 2, the block 2 can be reinforced with this tube 3, but if necessary, reinforcing bars can be embedded in the block 2. You can also do that.

When waves advance from the outside of the bay 30 to the breakwater 27 shown in FIG.
It is easily guided to the small diameter part 11 by the action of , and reaches the inner side 31 of the bay through this small diameter part 11 , the inside of the tube body 3 , and the constricted part 17 . At this time, there may be a collision with the small diameter portion 11 or the inner surface of the tube body 3, or a collision from the small diameter portion 11 with the tube body 3.
Energy is absorbed and dissipated by the change in the cross-sectional area of the passage toward the . Moreover, when the wave propagates from the constriction part 17 to the inner side of the bay, the passage cross-sectional area increases, and wave dissipation is performed. In this way, the waves are dissipated while passing through the through hole 4, so it is possible to dissipate the waves while preventing the generation of wave splash. Aperture part 17
acts on waves returning from the inner side 31 of the bay to the outer side 30 of the bay in the same way as the small diameter section 11.

As the waves pass through the through hole 4, a water flow is generated inside the through hole 4, so water is constantly flowing inside the through hole 4, and stagnation is prevented from occurring. Ru. Furthermore, if the wave-dissipating block 1 is tilted as in this embodiment, a water flow can be generated based on this tilt.

In the above embodiment, the constriction part 17 is formed of a hardening material at the end of the tube 3 on the inside of the bay, that is, inside the insertion port 6. A sleeve similar to the end portion may be fitted and fixed. Alternatively, the opening end of the insertion port 6 may be simply communicated with the inner side 31 of the bay. Moreover, the aperture part 17 is
A thick cylindrical body may be formed in advance outside the tubular body 3, and after this cylindrical body is hardened, it may be inserted into the insertion port 6 and fixed.

Furthermore, the sleeve 8 can be formed thick in the radial and axial directions at the open end of the suction port 10, and in this way, it can be sufficiently protected against collisions with ships and floating objects on the water surface. It is possible to possess strong strength.

Effects of the Invention As described above, according to the present invention, it is possible not only to effectively dissipate waves without generating wave splash and while ensuring the flow of water, but also to make it possible to Wave absorption with a through-hole whose cross-sectional shape changes along the length is achieved by simply pouring concrete around the pipe body and fitting and fixing a sleeve at least on the outer end of the pipe body. The wave-absorbing and wave-dissipating block can be easily produced and the wave-absorbing and wave-dissipating block with good manufacturability can be obtained.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the wave absorbing and dissipating block according to the present invention, in which a is a plan view thereof, b is a sectional view from the front, c is a left end view thereof, and FIG. 2 is similar to FIG. 1. FIG. 3 is a cross-sectional view showing a breakwater constructed using the wave-dissipating blocks shown in FIG. 3, and FIG. 3 is a side view of the breakwater. 2...Block, 3...Pipe body, 4...Through hole,
8... Sleeve, 10... Suction port, 11... Small diameter part, 12... Connection part, 27... Breakwater (bank body),
30...Outside the bay, 31...Inside the bay.

Claims (1)

[Scope of Claims] 1. A through hole extending from the outside of the bay to the inside of the bay inside a columnar concrete block that is arranged in a horizontal direction from the outside of the bay to the inside of the bay and that can be stacked in multiples to construct an embankment body. A hole is formed, and a sleeve is fitted into at least the outer end of the through-hole, and the sleeve has a suction port that opens at the end surface of the block, and a suction port that is formed on the back side of the suction port and that is connected to the sleeve. A wave absorbing wave dissipating device comprising: a small diameter portion smaller in diameter than the through hole; and a connecting portion formed further back than the small diameter portion to connect the small diameter portion and the inner surface of the through hole. Block.