JPH0544483B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a wave absorbing and dissipating block.

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. Further, 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.

The object of the present invention is to solve the above-mentioned 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. That is.

Means for Solving the Problems In order to solve the above problems, the wave absorbing and 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 an embankment body. A through hole extending from the outside of the bay to the inside of the bay is formed inside a columnar concrete block, and at least at the end of the through hole outside the bay, there is a suction port that opens at the end face of the block, and from this suction port. The end portion of the throttle tube is connected to a small diameter portion having a smaller diameter than the through hole on the back side thereof, and a connecting portion whose diameter expands from the small diameter portion to an end portion having the same diameter as the through hole. It is something to do.

Effect According to the above configuration, waves propagating from the outside of the bay toward the inside of the bay are guided from the suction port of the throttle tube on the end face of the block to the small diameter section, and then through the connection section and into the through hole. and passes through the through hole. At this time, the waves easily collide with the inner surface of the small diameter portion due to the action of the suction port, and are propagated into the interior of the through hole while being subjected to a wave-dissipating action. Inside the through hole, the cross-sectional area of the passage is increased compared to the small diameter portion, so that energy is absorbed and waves are reliably dissipated. Wave dissipation also occurs when waves collide with the inner surface of the through hole.

According to the above, waves are dissipated while passing through the through hole instead of colliding with a rigid body, so that 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 absorbing and dissipating block, for example, a through hole is formed with a metal tube, a throttle tube is connected to the outer end of the through hole,
Then, it is only necessary to pour concrete around the shank, and 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 may have the same structure as the above-mentioned outer end, or the open end of the through hole may be opened directly to the inner side of the bay.

Embodiment An embodiment of the present invention will be described based on the drawings. 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, made of concrete in the shape of a square prism. Inside the block 2, there is a cast iron pipe 3 extending in the length direction of the block 2.
A through hole 6 is formed by the connected tube body 3 and the throttle tubes 4, 5, which are connected to both ends of the tube body 3, respectively. A mortar lining layer 7 for corrosion protection is formed on the inner surface of the tube body 3.

The throttle tube 4 connected to the outer end 3a of the tube body 3 has a bellmouth-shaped suction port 9 that opens at the outer end 4a of the block 2 at the outer end 8 of the block 2, and a bellmouth-shaped suction port 9 that opens at the outer end 8 of the block 2. Also formed on the back side is a small diameter portion 10 having a smaller diameter than the tubular body 3, and a connecting portion 11 that smoothly expands in diameter from this small diameter portion 10 to an end portion 4b having the same diameter as the tubular body 3.

Similarly to the throttle tube 4, the throttle tube 5 connected to the bay inner end 3b of the tube body 3 also has a bay inner end 5.
a is a bell-mouth-shaped discharge port 13 that opens at the bay inner end surface 12 of the block 2; a small-diameter portion 14 that is smaller in diameter than the tube body 3 on the back side of the discharge port 13; A connecting portion 15 whose diameter is smoothly expanded to an end portion 5b having the same diameter as that of the connecting portion 3 is formed.

Since the concrete block 2 is formed into a square prism shape, its outer surface has four side surfaces 16,
17, 18, and 19 appear. one aspect 1
At both longitudinal ends of block 2 at 8,
A convex portion 20 having a constant height is formed over a certain range. This convex portion 20 is formed over the entire width of the side surface 18. A concave portion 21 corresponding to the convex portion 20 is formed on the side surface 16 located on the opposite side to the side surface 18 on which the convex portion 20 is formed, so that when a plurality of blocks 2 are arranged side by side, the adjacent blocks 2 The convex portion 20 and the concave portion 21 are configured to fit into each other. Similarly, on the side surface 17, there is a pair of protrusions 2 at the center of the block 2 in the length direction.
0, and a pair of recesses 21 are formed on the side surface 19 at corresponding positions. Furthermore, hanging wire passage grooves 22 are provided around the entire circumference of both ends of the block 2, slightly toward the center.

When manufacturing the wave absorbing and dissipating block 1 shown in FIG.
The end portions 4b and 5b of the throttle tubes 4 and 5 on the connecting portions 11 and 15 side are respectively connected by tightening bolts at the flange portions, and the connected tube body 3,
The block 2 is formed by covering the throttle pipes 4 and 5 with a formwork and pouring concrete between them.

The cast iron surfaces of the tube body 3 and the throttle tubes 4 and 5 may be anti-corrosive by zinc spraying or the like, or painted to prevent algae from adhering to them. In addition, since a metal tube body 3 and throttle tubes 4 and 5 are embedded in the block 2, the block 2 can be reinforced by this, but if necessary, reinforcing bars can be installed in the block 2. You can also embed.

FIG. 2 is a cross-sectional view of a breakwater 23 as a breakwater body constructed by stacking a plurality of wave absorbing and dissipating blocks 1 vertically and horizontally. here 24
is a foundation part provided on the seabed, and the upper surface 25 of this foundation part 24 is formed to form an upward slope from the outer side 26 of the bay to the inner side 27 of the bay. The wave absorbing wave dissipating block 1 is stacked on the upper surface 25 of the base portion 24 and is similarly arranged to be inclined. Also, when stacking, the convex portions 20 of adjacent wave absorbing and dissipating blocks 1
and the recess 21 are fitted into each other and are firmly connected. An upper part 28 is arranged above the wave absorbing and dissipating block 1 at the top, and its upper surface 2
9 is formed horizontally to allow people to pass through. A convex portion 20 and a concave portion 21 are also formed on the upper portion 28 and the base portion 24, and are configured to fit into the concave portion 21 and convex portion 20 of the wave absorbing and dissipating block 1.

FIG. 3 is a view showing the inside or outside side of the breakwater 23 having a configuration similar to that shown in FIG. 2. As shown in the figure, the wave absorbing and dissipating blocks 1 are arranged and stacked in a rhombic shape with end mirrors. By adopting such a stacked structure, stress in the vertical direction can be dispersed laterally, so that a breakwater 23 with excellent strength can be obtained.

When waves advance toward the breakwater 23 shown in FIG. It reaches the inner side 27 of the bay from the discharge port 13 through the small diameter portion 14 . At this time,
Collision with the small diameter part 10 or the inner surface of the tube body 3, or the small diameter part 1
Energy is absorbed and dissipated by the change in the cross-sectional area of the passage from zero to the tube body 3. Also, when the wave propagates from the small diameter portion 14 on the inside of the bay to the inside 27 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 6, so it is possible to dissipate the waves while preventing the generation of wave splash. The small diameter part 14 on the inside of the bay acts on waves returning from the inside 27 of the bay to the outside 26 of the bay in the same way as the small diameter part 10 of the outside of the bay. As the waves pass through the through hole 6, water constantly flows inside the through hole 6, thereby preventing the occurrence of stagnation.
Furthermore, if the wave absorbing and dissipating block 1 is tilted as illustrated in FIG. 2, a water flow can be generated based on this tilt.

In addition, in the above-mentioned embodiment, a case was described in which the throttle tube 5 was connected to the bay side end 3b of the tube body 3 as well as the bay side end 3a, but instead of this, the bay side end 3b of the tube body 3 The end portion 3b may simply be opened to the inner side 27 of the bay with the end 3b facing the end face 12 of the block 2 on the inner side of the bay, or a hardening material such as concrete or resin mortar may be used inside the end portion 3b to form a shape similar to that of the throttle tube 5. Discharge port 13, small diameter part 1
4. The connecting portion 15 may be formed, and furthermore, the small diameter portion 14 may be formed into a thick cylindrical body in advance, and this may be inserted into the tube body 3 and fixed.

Furthermore, the throttle tubes 4 and 5 can be formed thick in the radial and axial directions at the open ends of the suction port 9 and the discharge port 13, and by doing so, floating objects on ships and water surfaces can be formed thicker. It has sufficient strength against collisions.

Effects of the Invention As described above, according to the present invention, not only can wave dissipation be performed well without generating wave splash and in a state where water flow is ensured, but also good productivity can be achieved. A wave absorbing/dissipating block 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 of the front view, c is a left end view of the block, and FIG.
FIG. 3 is a cross-sectional view showing a breakwater constructed using the wave absorbing and dissipating blocks shown in the figure, and FIG. 3 is a side view of the breakwater. 2... Block, 3... Pipe body, 4, 5... Throttle pipe, 6... Through hole, 9... Suction port, 10... Small diameter part, 11... Connection part, 23... Breakwater (bank body) ),
26...Outside the bay, 27...Inside the bay.

Claims (1)

[Claims] 1. Forming a through-hole from the outside of the bay to the inside of the bay inside a column-shaped concrete block that is arranged horizontally from the outside of the bay to the inside of the bay and can be stacked to form an embankment body. At least at the outer end of the through hole, there is a suction port that opens at the end face of the block, a small diameter part that is smaller in diameter than the through hole on the back side of the suction port, and a part that extends from the small diameter part to the same diameter as the through hole. 1. A wave absorbing wave dissipating block characterized in that the end portion of a throttle tube formed with a connecting portion whose diameter is enlarged to the end portion is connected to the connecting portion.