JPH0562166B2 - - Google Patents
Info
- Publication number
- JPH0562166B2 JPH0562166B2 JP19196287A JP19196287A JPH0562166B2 JP H0562166 B2 JPH0562166 B2 JP H0562166B2 JP 19196287 A JP19196287 A JP 19196287A JP 19196287 A JP19196287 A JP 19196287A JP H0562166 B2 JPH0562166 B2 JP H0562166B2
- Authority
- JP
- Japan
- Prior art keywords
- wave
- dissipating
- narrow passage
- cross
- sectional area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000002834 transmittance Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- 230000002238 attenuated effect Effects 0.000 description 3
- 230000001902 propagating effect Effects 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Revetment (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は防波堤などの消波壁を構成する消波構
造体に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a wave-dissipating structure constituting a wave-dissipating wall such as a breakwater.
従来の技術
従来における防波堤などの消波壁として、たと
えば特願昭61−214918号（特公平４−48123号公
報）に開示されるように、一端側の開口が湾外側
に位置するとともに他端側の開口が湾内側に位置
する消波用のパイプ状構造物を上下左右に複数積
み上げたものが知られている。ここで、パイプ状
構造物は四角柱状のコンクリートブロツクの内部
に、鋳鉄などにて異形断面に形成された消波管を
埋設したものが一般的である。このような構成に
よれば、湾外側から進行してきた波は、消波管内
を通過するときに、この消波管内における通路断
面積の変化などにより減衰を受けることとなる。BACKGROUND TECHNOLOGY As disclosed in Japanese Patent Application No. 61-214918 (Japanese Patent Publication No. 4-48123), a conventional wave-dissipating wall such as a breakwater has an opening at one end located on the outside of the bay and an opening at the other end. It is known that a plurality of wave-dissipating pipe-like structures with side openings located on the inside of the bay are stacked vertically and horizontally. Here, the pipe-like structure is generally one in which a wave-dissipating pipe made of cast iron or the like and having an irregular cross section is buried inside a concrete block in the shape of a square prism. According to such a configuration, when waves traveling from the outside of the bay pass through the wave-dissipating tube, they are attenuated due to changes in the cross-sectional area of the passage within the wave-dissipating tube.
発明が解決しようとする問題点
しかし、従来のような構成では、消波管の流路
断面積を大きくして、消波管内への波浪の入り込
みを容易なものとなして波浪の反射率を低くする
と、波浪の透過率が高くなり、消波効果が薄れる
問題があつた。Problems to be Solved by the Invention However, in the conventional configuration, the flow path cross-sectional area of the wave-dissipating tube is increased to make it easier for waves to enter the wave-dissipating tube, thereby reducing the reflectance of waves. When it is lowered, there is a problem that the transmittance of waves increases and the wave-dissipating effect weakens.
本発明は上記問題点を解決するもので、波浪の
反射率を低くするとともに波浪の透過率を低くす
る消波構造体を提供することを目的とする。 The present invention solves the above-mentioned problems, and aims to provide a wave-dissipating structure that reduces wave reflectance and wave transmittance.
問題点を解決するための手段
上記問題点を解決するため、本発明は、開口に
較べて流路断面積の小さい狭路部を両端部に形成
された消波孔を有し、この消波孔の一端側の開口
を波浪の伝播方向に向けて配置される消波構造体
において、一端側の狭路部に較べて他端側の狭路
部の流路断面積を小さくした構成としたものであ
る。Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has a wave-dampening hole formed at both ends with a narrow passage portion having a smaller cross-sectional area than the opening. In a wave-dissipating structure that is arranged with the opening at one end of the hole facing the direction of wave propagation, the cross-sectional area of the narrow passage at the other end is made smaller than that at the one end. It is something.
作 用
上記構成において、消波構造体に向けて伝播し
て来た波浪は、一端側の開口より消波孔内に伝播
し、流路断面積の変化による圧力損失等により減
衰されて消波される。この時、流路断面積の大き
な一端側の狭路部においては、他端側の狭路部に
較べて、波浪の入り込みが容易で反射率が低いも
のであるとともに透過率が高いものであり、他端
側の狭路部においては、一端側の狭路部に較べて
流路断面積が小さいために、反射率が高いもので
あるとともに透過率が低いものである。このため
に、消波構造体は消波孔の一端側の開口に向けて
伝播してくる波浪に対して反射率の低いものとな
るとともに、他端側の開口に向けて透過する波浪
に対して透過率の低いものとなる。Effect In the above configuration, waves propagating toward the wave-dissipating structure propagate into the wave-dissipating hole through the opening at one end, and are attenuated by pressure loss due to changes in the cross-sectional area of the channel, and are dissipated. be done. At this time, in the narrow passage at one end where the cross-sectional area of the channel is large, compared to the narrow passage at the other end, waves can easily enter the passage, the reflectance is low, and the transmittance is high. Since the narrow passage portion on the other end side has a smaller flow passage cross-sectional area than the narrow passage portion on the one end side, the reflectance is high and the transmittance is low. For this reason, the wave-dissipating structure has a low reflectance for waves propagating toward the opening at one end of the wave-dissipating hole, and also for waves transmitting toward the opening at the other end. This results in low transmittance.
実施例
以下、本発明の一実施例を図面に基づいて説明
する。第１図において消波構造体１は消波管２の
周囲をコンクリート３で固めて断面矩形状のコン
クリートブロツクに形成されている。そして、消
波管２は鋳鉄管により形成されており、この消波
管２によつて消波構造体１に消波孔４が形成され
ている。そして、消波構造体１は消波孔４の一端
側の開口５ａを波浪６の伝播方向に向けて配置さ
れており、消波孔４には開口５ａ，５ｂよりも流
路断面積の小さい狭路部７ａ，７ｂと、狭路部７
ａ，７ｂよりも流路断面積の大きい遊水部８とが
形成されている。そして、一端側の狭路部７ａに
較べて他端側の狭路部７ｂは流路断面積を小さく
形成されている。Embodiment Hereinafter, an embodiment of the present invention will be described based on the drawings. In FIG. 1, a wave-dissipating structure 1 is formed into a concrete block having a rectangular cross section by hardening the periphery of a wave-dissipating pipe 2 with concrete 3. The wave-dissipating tube 2 is formed of a cast iron pipe, and the wave-dissipating hole 4 is formed in the wave-dissipating structure 1 by the wave-dissipating tube 2 . The wave-dissipating structure 1 is arranged with the opening 5a at one end of the wave-dissipating hole 4 facing the propagation direction of the waves 6, and the wave-dissipating hole 4 has a flow passage cross-sectional area smaller than that of the openings 5a and 5b. Narrow passage portions 7a, 7b and narrow passage portion 7
A water retarding portion 8 having a larger flow passage cross-sectional area than those of a and 7b is formed. The narrow passage part 7b on the other end side is formed to have a smaller cross-sectional area than the narrow passage part 7a on the one end side.
以下、上記構成における作用について説明す
る。まず、消波構造体１に向けて伝播して来た波
浪６は、一端側の開口５ａより消波孔４内に伝播
し、流路断面積の変化による圧力損失等により減
衰されて消波される。この時、流路断面積の大き
な一端側の狭路部７ａにおいては、他端側の狭路
部７ｂに較べて波浪６の入り込みが溶易で反射率
が低いものであるとともに透過率が高いものであ
る。また、他端側の狭路部７ｂにおいては、一端
側の狭路部７ａに較べて流路断面積が小さいため
に、反射率が高いものであるとともに透過率が低
いものである。このために、消波構造体１は消波
孔４の一端側の開口ａに向けて伝播してくる波浪
６に対して反射率の低いものとなるとともに、他
端側の開口５ｂに向けて透過する波浪６に対して
透過率の低いものとなる。 Hereinafter, the effects of the above configuration will be explained. First, the waves 6 that have propagated toward the wave-dissipating structure 1 propagate into the wave-dissipating hole 4 through the opening 5a at one end, and are attenuated by pressure loss due to a change in the cross-sectional area of the channel, and are dissipated. be done. At this time, in the narrow passage section 7a at one end where the cross-sectional area of the flow path is large, compared to the narrow passage section 7b at the other end, the waves 6 enter easily and the reflectance is low, and the transmittance is high. It is something. Further, in the narrow passage portion 7b on the other end side, the cross-sectional area of the flow path is smaller than that of the narrow passage portion 7a on the one end side, so that the reflectance is high and the transmittance is low. For this reason, the wave-dissipating structure 1 has a low reflectance with respect to the waves 6 propagating toward the opening a at one end of the wave-dissipating hole 4, and also has a low reflectance toward the opening 5b at the other end. The transmittance is low relative to the waves 6 passing through.
次に第２図は、本発明の他の実施例を示すもの
であり、先の実施例と同一部材については同一番
号を付して説明を省略する。この構成において
は、一端側の狭路部１１ａに較べて他端側の狭路
部１１ｂの流路断面積を小さくするとともに、他
端側の狭路部１１ｂにおける流路を長くすること
により、透過率をより低いものとすることが出来
る。 Next, FIG. 2 shows another embodiment of the present invention, and the same members as those in the previous embodiment are given the same numbers and the explanation thereof will be omitted. In this configuration, by making the passage cross-sectional area of the narrow passage part 11b on the other end side smaller than that of the narrow passage part 11a on the one end side, and making the passage in the narrow passage part 11b on the other end side longer, Transmittance can be lowered.
発明の効果
以上述べたごとく本発明によれば、消波孔の両
端部に形成される狭路部の流路断面積を異ならし
めることによつて、波浪の反射率を低くするとと
もに波浪の透過率を低くすることが出来る。Effects of the Invention As described above, according to the present invention, by making the flow passage cross-sectional areas of the narrow passages formed at both ends of the wave-dissipating hole different, the reflectance of waves can be lowered and the waves can pass through. rate can be lowered.
第１図は本発明の一実施例を示す全体構成図、
第２図は本発明の他の実施例を示す全体構成図で
ある。
１……消波構造体、４……消波孔、６……波
浪、７ａ，７ｂ，１１ａ，１１ｂ……狭路部。
FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is an overall configuration diagram showing another embodiment of the present invention. 1...Wave-dissipating structure, 4...Wave-dissipating hole, 6...Wave, 7a, 7b, 11a, 11b...Narrow path portion.
Claims (1)
端部に形成された消波孔を有し、この消波孔の一
端側の開口を波浪の伝播方向に向けて配置される
消波構造体において、一端側の狭路部に較べて他
端側の狭路部の流路断面積を小さくしたことを特
徴とする消波構造体。 ２ 他端側の狭路部における流路を長く形成した
ことを特徴とする特許請求の範囲第１項記載の消
波構造体。[Claims] 1. A wave-dissipating hole is formed at both ends of a narrow passage portion having a smaller cross-sectional area than the opening, and the opening at one end of the wave-dissipating hole is oriented in the wave propagation direction. What is claimed is: 1. A wave-dissipating structure disposed in a wave-dissipating structure, characterized in that the cross-sectional area of a narrow passage section on the other end side is smaller than that of the narrow passage section on the one end side. 2. The wave-dissipating structure according to claim 1, wherein the flow path in the narrow passage portion on the other end side is formed to be long.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19196287A JPS6436813A (en) | 1987-07-30 | 1987-07-30 | Wave-breaking block |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19196287A JPS6436813A (en) | 1987-07-30 | 1987-07-30 | Wave-breaking block |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6436813A JPS6436813A (en) | 1989-02-07 |
| JPH0562166B2 true JPH0562166B2 (en) | 1993-09-07 |
Family
ID=16283343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19196287A Granted JPS6436813A (en) | 1987-07-30 | 1987-07-30 | Wave-breaking block |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6436813A (en) |
-
1987
- 1987-07-30 JP JP19196287A patent/JPS6436813A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6436813A (en) | 1989-02-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |