JPH01304212A - wave dissipation block - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications TECHNICAL FIELD The present invention relates to a wave-dissipating block.

BACKGROUND ART Conventional wave-dissipating walls such as breakwaters have been used, for example, as disclosed in Japanese Patent Application No. 61-214918. It is known that a plurality of pipe-shaped II3"a wave-dissipating pipes are stacked on top and bottom cloth.

Here, the pipe-like If4 structure is generally one in which a wave-dissipating pipe formed of cast iron or the like with an irregular cross section is buried inside a square columnar concrete block.

According to such a configuration, waves traveling from the outside of the bay travel within the wave-dissipating pipe at 'i!'. When waves pass through the wave-dissipating tube, waves will be attenuated due to changes in the cross-sectional area of the passage inside the wave-dissipating tube. If the wave reflectance is lowered by making it easier for waves to enter, there is a problem in that the wave transmittance increases and the wave-dissipating effect weakens.

As a solution to this problem, a thin-walled protrusion that protrudes in the radial direction of the tube is provided in the narrow passage formed inside the wave-dissipating tube in an annular shape along the inner circumference of the tube. There are several possible configurations. In other words, the protrusion causes turbulence in the waves passing through the narrow passage, and a separated vortex is generated at the inner peripheral edge of the protrusion, and this separated vortex acts as resistance on the waves, thereby reducing the transmittance. This structure aims to reduce the amount of water and increase the wave-dissipating effect.

Problems to be Solved by the Invention However, if a thin-walled annular protrusion is provided inside the pipe as in the above-mentioned configuration and fixed by means such as welding when pulling, it will take time and effort to fix the protrusion in front of the protrusion. There is a problem, and it is difficult to ensure strength J5 and durability against the impact of waves by simply providing a thin plate as a protrusion.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wave-dissipating block equipped with an annular protrusion having sufficient strength against waves.

Means for Solving and Overcoming the Problems In order to solve the above-mentioned problems, the present light is provided with an opening at one end of the wave-dissipating hole facing the wave propagation direction, and an opening inside the wave-dissipating hole. A narrow passage portion having a flow passage cross-sectional area smaller than that of the wave-dissipating hole is provided. It is formed of a thin-walled casting in the shape of a letter 7, and one piece of the thin-walled casting in the shape of a letter 7 projects in the radial direction of the wave-dissipating hole to form an annular protrusion.

Operation With the above configuration, the wave energy flowing into the wave-dissipating hole is absorbed, attenuated, and dissipated as the flow path cross-sectional area of the wave-dissipating hole expands and contracts. In addition, when the waves pass through the annular protrusion, a separated vortex is generated in the wave flow, and this separated vortex acts as a resistance to the wave flow.
The wave dissipation efficiency of the wave hole is improved. And 7
By supporting one piece of the J-shaped annular protrusion by another Ni-Ha extending in the axial direction of the wave-dissipating hole, against the wave force applied to the annular protrusion,
Sufficient strength of the annular protrusion is ensured in the axial direction of the wave-dissipating hole.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings. J3 in Figures 1 to 2 (aHb), wave-dissipating block 1] Tsuku 1
is constructed by providing a concrete block 3 around the iron pipe 2, and the wave-dissipating hole 4 formed by the cast iron pipe 2
It is arranged with one end opening /Ia facing the direction in which the waves 5 propagate. Further, a socket 6 is provided at one end of the cast iron pipe 2, and the inner diameter of the socket 6 is larger than the inner diameter of the control section 7. For this purpose, a step portion 8 is formed in an annular shape at the rear end of the socket 6. The thin-walled casting 9 placed inside the socket 6 allows the opening 4a to
A narrow passage portion 10 having a smaller flow passage cross-sectional area is formed. This thin-walled casting 9 has an annular shape along the inner circumferential surface of the socket 6, and has a figure-7 cross-sectional shape along the axial direction of the wave-absorbing hole 4, and has a radial direction of the wave-absorbing hole 4. One piece 9a protruding from the top forms an annular projection 11. Also, thin wall I
The other three pieces 9b and 9c of the pickle 9 are in contact with the inner circumferential surface of the cast iron pipe 2 at their peripheral edges, and are arranged in the wave-dissipating hole 4 so that the angle between the three pieces 9b and 9c is 90°. They are spread apart in the axial direction. The socket 6 is provided with an interior 6a that penetrates in the radial direction of the pipe around the periphery, and a plurality of first tongue pieces 12 that protrude in the radial direction of the pipe are permanently attached to the opening edge of the socket 6. They are provided at appropriate intervals in the circumferential direction. Further, a first tongue piece 12 is provided at the peripheral edge of the other piece 9b of the thin-walled casting 9.
A plurality of cutout portions 13 are provided through which the cutout portions 13 can pass in the tube axis direction, and the peripheral edges left between the cutout portions 13 are formed into second tongue pieces 14. Also, another piece 9c
has an outer diameter that allows the first tongue piece 12 to pass through. Therefore, the first tongue piece 12, the notch part 13, and the second tongue piece 14
The bayonet structure is composed of And the second
One side of the first tongue piece 12 corresponding to the tongue piece 14 is formed into a tapered shape, and the first tongue piece 12 touches the second tongue piece 14 in a state where the first tongue piece 12 and the second tongue piece 14 overlap. It is locked in the circumferential direction. Further, in the thin casting 9, the second tongue piece 14 of the piece 9c located on the rear end side of the socket 6 is locked in the axial direction of the wave-dissipating hole 4 by the stepped portion 8.

The effects of C on the above configuration will be explained below.

First, the wave-dissipating hole 4 has a shape in which the cross-sectional area of the flow passage is expanded or contracted by being narrowed down in the narrow passage portion 10 and changes. For this reason, the waves 5 that have flowed into the wave-dissipating hole 4 have their wave energy absorbed by the expansion and contraction of the channel cross-sectional area of the wave-dissipating hole 4, and are attenuated and dissipated. Also, when the wave 5 passes through the annular protrusion 11, the wave 85 has a peeling @
A vortex 15 is generated, and this separated vortex acts as a resistance to the flow of waves 5, and the wave-dissipating efficiency in the wave-dissipating hole J3 decreases. An annular protrusion 11 forming a piece of the figure 7 thin-walled casting 9
or another evaporator 9b that spreads apart in the axial direction of the wave-dissipating hole 4;
9c, C in the axial direction of the wave-dissipating hole 4 against the force of waves applied to the annular protrusion 11.
- The strength of the annular protrusion 11 is sufficiently ensured.

Next, FIG. 3 shows another embodiment of the present invention,
Components that perform the same functions as those in the previous embodiment will be designated by the same reference numerals and descriptions thereof will be omitted. This embodiment is characterized in that the opening edge of the receiver [16] and the peripheral edge of the piece 9b of the thin-walled casting 9 are fixed by welding.
According to this configuration, the thin-walled casting 9 and the cast iron pipe 2 can be securely fixed by welding.

Next, FIG. 4 shows still another embodiment of the present invention, and members that perform the same functions as those in the previous embodiment are designated by the same reference numerals and explanations thereof will be omitted.

This embodiment is characterized in that a taper pin 21 is inserted into the socket 6 in the radial direction of the tube, and a piece 9b of the thin-walled casting 9 is retained by this J-per pin 21.

Next, FIG. 5 shows still another embodiment of the present invention, and members having the same functions as those in the previous embodiment are given the same reference numerals and explanations thereof will be omitted.

In this embodiment, the pin 22 is inserted into the hole 23 of the receiver 6 in the tube radial direction, and the bolt 24 is inserted into the pin 22 while being screwed in the tube axis direction. The thin casting 9 is pressed toward the back end of the socket 6, and the reaction force is used to press the pin 22 to the opposite side.
It is characterized by fixing the and the receiver n6. According to this configuration, the hole 23 can be provided at a position with a sufficient margin relative to the thin-walled casting 9, and the machining operation can be easily performed.

Next, FIG. 6 shows still another embodiment of the present invention, in which members having the same functions as those in the previous embodiment are given the same reference numerals and explanations thereof will be omitted.

In this embodiment, a wedge 25 is inserted between the pin 22 and the thin casting 9, and the wedge 25 presses the pin 22 and the thin casting 9 in opposite directions. The mouth 6, the pin 22, the wedge 25, and the thin-walled pickle 9 are fixed. According to this configuration, the positional relationship between the hole 23 and the thin-walled casting 9 can be made to have a sufficient margin, and since the wedge 25 can be driven or fixed, the structural members can be simplified.

Further, in all the embodiments described above, the thin-walled casting 9 can be placed at any position in the wave-dissipating hole 4.

Effects of light As described above, according to the present invention, the annular protrusion 11 forming one piece of the figure 7 thin-walled casting is supported by another evaporator that is spaced apart and spread out in the axial direction of the wave-dissipating hole. According to
Sufficient strength of the annular projection in the axial direction of the wave-dissipating hole 4 can be ensured against the force of waves applied to the annular projection.

[Brief explanation of the drawing]

Fig. 1 is an overall sectional view showing one embodiment of the present invention, and Fig. 2 (
a) is a diagram showing how the cast iron pipe 2 and thin-walled casting 9 fit together in FIG. 1, and FIG.
FIG. 3 is an overall sectional view showing an embodiment of the present invention, FIG. 4 is an overall sectional view showing still another embodiment of the invention, and FIG. 5 is an overall sectional view showing another embodiment of the invention. FIG. 6 is an overall sectional view showing still another embodiment of the present invention. 1... Wave-dissipating flock, 2... Cast iron pipe, 3... Concrete flock, 4... Wave-dissipating hole, 5... Wave, 9
. . . Thin wall casting, 10 . . . Narrow passage portion, 11 . . . Annular protrusion. To agent Yoshihiro Morimoto, ('u N ~ N

Claims (1)

[Claims] 1. The opening at one end of the wave-dissipating hole is arranged to face the wave propagation direction, and a narrow passage portion having a smaller flow passage cross-sectional area than the opening is provided inside the wave-dissipating hole. is formed of a thin-walled casting that has an annular shape along the inner peripheral surface of the wave-dissipating hole and a Y-shaped cross-section along the axial direction of the wave-dissipating hole, and one piece of this Y-shaped thin-walled casting is A wave-dissipating block characterized by forming an annular protrusion projecting in the radial direction of a wave-dissipating hole.