JPS58178707A - Breakwater work - Google Patents

Abstract

PURPOSE:To raise the wave-breaking effect of a breakwater work by providing through holes designated under a fixed requirement for the breakwater work without altering its shape and structure. CONSTITUTION:In a tetrapot type breakwater work in which four legs 1a having a tapered conical shape with equal lengths are projected toward the direction of equally dividing a three-dimensional space at 120 deg. for each, concentrically round holes 2 of nearly equal and as much a large diameter as possible are provided in the cross section of the legs 1a by leaving a thickness enough to keep necessary weight and strength intact. The holes 2 are led to each other at the center of the tetrapot type breakwater. Since the tetrapot type breakwaters are almost predetermined in terms of arrangement and applicatory form in relation to the advancement and swelling of tidal wave for the river dam, etc., the holes 2 of the legs 1a are of necessity pierced toward the direction of most severely inducing the movement of water particles caused by tidal waves, and thereby the water particles are jetted upwardly like spring water and the absorption and damping of the energy of the tidal waves are brought about.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wave-dissipating device which has been improved to further enhance the wave-dissipating effect t-.

Wave-dissipating structures have long been used as structures for the purpose of coastal protection.
) Various structural types have been tried and constructed.

Wave-dissipating structures are constructed of four concrete slabs with a special shape, weight, and stability to help prevent wave energy dispersion, loss, or destruction of existing structures on natural beaches.
If the friend that has been developed and improved as a result of the experiment,
It is said that the wave-dissipating effect of conventional wave-dissipating structures has not yet been sufficiently demonstrated, and there are great expectations for future improvements and developments. When conducting experiments with wave dissipators, gassho block wave dissipators, triverb four-piece dissipators, etc., with holes drilled through each, it was found that the wave dissipating effect was significantly improved.

Therefore, the purpose of this invention is to absorb and attenuate wave energy by simply penetrating the hole 1 under certain conditions without making any essential changes to the form or structure of the wave dissipating structure.
The objective is to provide a wave-dissipating device by improving the structure so that the wave-dissipating effect is enhanced by dispersing the waves.

The ultimate purpose of this invention is to penetrate a hole of equivalent diameter in the direction that most intensely induces the movement of water particles caused by waves KL (this direction also means the direction t in the actual construction state). It is an object of the present invention to provide a wave dissipating structure having a specified configuration.

Next, this invention will be explained by means of illustrated embodiments. 1!1 and 1.2 show a tetrabod type wave dissipator 1 which is a first embodiment of the present invention. That is, the three-dimensional space 112
0@ equally divided conical shape and equal length in the direction of the conical part 1
In a tetrabod type wave dissipator consisting of a total of four protruding legs, each leg 1a
In the axial direction of the TetraBod type wave dissipator, its legs @ 1 m, leaving enough wall thickness to maintain the necessary weight and strength.
Holes 2 of the largest possible diameter concentrically in the cross section are provided with approximately equal diameters, and the holes 2 are placed in the center to communicate with each other. The structure is the same as that of wave dissipator 1 and 9. Next,
Figures 3 and 4 show a folding block type wave dissipator 3 which is a second embodiment of the present invention. That is, in the gassho block type wave dissipator 3 having a shape in which two parallel auxiliary legs 3m, 3m of main legs 3bt and 3m are interposed and have a protrusion 1113e, each auxiliary leg is It is possible to form a rectangular shape t that is approximately similar to the cross section of the auxiliary leg 3a, leaving enough wall thickness in the axial direction of 3m and 3m to maintain the necessary weight and strength as the gassho block type wave dissipator 3. The holes 4, 4, each having a large diameter, are formed to penetrate through each hole.Next, Figs. Block tear dissipator 5t-shown.

That is, the tribber block type wave dissipator 5 has a cylindrical leg WiA 5 m of equal length at each vertex of a substantially equilateral triangle, and is integrally connected with the frame part 5b to form a companion configuration. In the axial direction of each leg 5a, the leg s5a has a wall thickness that can maintain the necessary weight and strength as a tri-bar block type wave dissipator, and the leg s5a has a concentric circle in the cross section. It has a configuration in which the holes 6t each have a diameter extending through them.

However, the above-mentioned tetrabod type wave dissipating structure 1 ↓ and gassho block type wave dissipating structure 3 are used in a usage state or a construction state in which they are placed side by side in a fixed arrangement against the progression of waves and swells on river embankments, beaches, etc. is approximately determined 0 Therefore, the holes ff7j installed in each leg l51m... of the tetrabod type wave dissipator 1, or the holes 4 provided in the auxiliary legs 3a... of the gassho block type wave dissipator 3, are as follows. Inevitably, the holes will penetrate in the direction that most intensely induces the movement of water particles caused by waves.
(as shown in Figure 6), it is constructed as a horizontal pile on top of the covering rubble 8 of the slope embankment 1, so in this construction state, the holes 6 in the legs 5a are exposed to water caused by waves. Particle luck! IE! 1ttlI41kL<O which becomes a hole penetrating in the direction of guiding As a shape effect based on the barrel shape 11, by absorbing, attenuating, or dispersing wave energy as usual, it not only has a wave-dissipating effect like that of C, but also has a unique effect on waves. As a result of violently guiding the motion t of the water particles into the holes 2, 4, or 6 provided through the wave dissipator, to put it simply, it is converted into a horizontal movement mt-up and down motion of the water particles, which becomes even more extreme. It passes through holes 2, 4, or 6 and protrudes upward like a fountain, producing a wave-dissipating effect that absorbs or destroys wave energy.By the way, in a wave energy measurement experiment, According to the results, the size of the wave energy absorbed and attenuated through the hole 2 of the tetrabod type wave dissipator 1, the hole 4 of the gassho-Plutsuk type wave dissipator 3, or the hole 6 of the triver block type wave dissipator 5 is P( Kxun is measured as shown in the graph of Figure 7 AB.Incidentally, in the graph of Figure 7A, the 9th axis is the wave energy size P (KW), and the 4th axis is the wave height H. The ratio between the wave height H and the wavelength is 0.733 as compared to the aquarium water depth.
< H/L < 1.857. @7 The graph in Figure B shows the results of measurement under the conditions of H/L value association and the range of H/L > 1.857. A wave dissipator constructed by penetrating the hole in the direction that guides the most violent movement of water! Therefore, the wave dissipating structure has the following effects: There is no change in the shape of the wave dissipating structure (shape effect), and it not only has the original wave dissipating effect based on its shape, but also In addition, a wave-dissipating effect is added by absorbing, attenuating, or dispersing wave energy through the holes, resulting in an extremely excellent wave-dissipating effect tube. Therefore, the purpose of coastal conservation Rurui or river facility conservation @ x (flll!-
can do.

Figure 181 is a perspective view of a tetrabod type wave dissipator which is the lR1 embodiment of this invention, Figure 2 is a sectional view of the same, and Figure 3 is a perspective view of a ruru gassho block type wave dissipator which is the second embodiment of this invention. A perspective view, FIG. 4 is a sectional view of the same front, a BS diagram is a plan view showing the construction state of the Toribar Block W wave dissipating structure which is the third embodiment of the present invention, and FIG. 6 is a sectional view of the same front, Figure 7 A and B show the results of the wave energy absorption adjustment experiment 01... Tetrabod type wave dissipator 1a... Leg 2... Hole 3.-
Gassho block type wave dissipator 3a...Auxiliary leg 4...
・Hole 5... Toribar block type wave dissipator 5a・
-・Leg 6... Hole Inventor Mamoru Shinobata Inventor Kayano Perfume Inventor Kenji Tamura Applicant Takenaka Corporation Representative Patent Attorney Yujibe Taka, ゛1 ・、−′;・ Figure 1 Figure 2 Figure 4 Figure 5a 6 5b Figure 7, X (KW) H/h Figure 7 H H/h

Claims (4)

[Claims] (1) A wave-dissipating structure with a hole penetrated in the direction that induces the most violent movement of water caused by waves. (2) The wave dissipator according to claim 1, wherein holes are provided in the axial direction of each leg of the tetrabod type wave dissipator to communicate with each other. (3) The wave dissipator according to claim m1, wherein a hole is provided through the auxiliary leg in the axial direction of the auxiliary leg of the wave dissipator. (4) A wave breaker according to claim 1, in which the bird block type wave breaker has holes 7 extending through the legs in the axial direction.