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JP3781685B2 - Sandy beach cultivation method and apparatus - Google Patents
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JP3781685B2 - Sandy beach cultivation method and apparatus - Google Patents

Sandy beach cultivation method and apparatus Download PDF

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Publication number
JP3781685B2
JP3781685B2 JP2002036733A JP2002036733A JP3781685B2 JP 3781685 B2 JP3781685 B2 JP 3781685B2 JP 2002036733 A JP2002036733 A JP 2002036733A JP 2002036733 A JP2002036733 A JP 2002036733A JP 3781685 B2 JP3781685 B2 JP 3781685B2
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Japan
Prior art keywords
wave
fixed pile
sandy beach
dissipating body
installation
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Expired - Lifetime
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JP2002036733A
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Japanese (ja)
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JP2003239247A (en
Inventor
銀二郎 恩田
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Individual
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A10/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
    • Y02A10/11Hard structures, e.g. dams, dykes or breakwaters

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Description

【0001】
【発明が属する技術分野】
本発明は、砂浜育成装置、より詳細には、押し寄せる波によって自然に造成され且つ侵蝕される砂浜を、人工的に保護して育成するための砂浜育成装置に関するものである。
【0002】
【従来の技術】
砂浜は、絶え間なく押し寄せる波によって運ばれてくる砂や貝殻のかけら等によって、自然に造成される。しかし、一旦造成された砂浜も、波によって侵蝕されることが少なくない。
【0003】
即ち、沖合において発生した波は、砂浜付近の深みから、急激に浅瀬に至る個所で巻波となって進行し、左右に広がった波の一方端から渦巻きを作って崩れて行き、その際に砂が巻き上げられ、波が引く際に砂が運び去られるために、砂浜が侵蝕されるのである。
【0004】
従って、砂浜を育成するには、巻波を、砂浜からできるだけ離れた地点で崩して、砂浜を侵蝕させないようにすればよいことになるが、このような発想に基づいて砂浜を育成しようとする考えは提唱されていない。
【0005】
【発明が解決しようとする課題】
本発明は、上記観点から砂浜を育成すべくなされたもので、単純な方法及び構造であって、装置自体のコスト及び設置コストが比較的低廉で、しかも確実に砂浜の育成及び維持を実現し得る砂浜育成装置を提供することを課題とする。
【0006】
【課題を解決するための手段】
上記課題を解決するための本発明に係る砂浜育成装置は、沖合設置時に波に向けられることになる前面及び両端を開口した半筒状であって、下方に延びる固定杭を備えた消波体を設け、前記固定杭にはその上部から下端に抜ける水路が形成され、前記水路には、外部から高圧水が供給されてその先端から噴出可能であることを特徴とする。
【0007】
前記消波体の前面開口部は、若干斜め上向きに開口される。
【0008】
好ましくは、前記固定杭の中間部に、設置時における沈下防止するためフランジ状ストッパーを設ける。
【0009】
【発明の実施の形態】
本発明の実施の形態を添付図面に依拠して説明する。図1は、本発明に係る砂浜育成装置の構成を示すもので、該装置は、消波体1に、通例2本の固定杭3を備えて成る。消波体1は、断面がC字状、半円形、半多角形等の両端及び前面を開口した半筒状で、その沖合設置時に波に向けられる前面開口部2は、若干斜め上向きにされることが好ましい。消波体1は、下方に延びる固定杭3を介して沖合に固定される。
【0010】
消波体1の長さや径寸等は特に制限されないが、消波装置を構築する場所の干満時の水深差、消波装置を構築する水域の波浪の状態等、種々の条件を考慮して、適宜決定されるが、消波機能、取り扱い性、設置のし易さ、製造の容易性等の点からして、一般には、長さが3〜15m、直径が1〜3mの範囲が適当であるが、勿論このサイズに限定される訳ではない。
【0011】
消波体1の材質は特に制限されず、設置したときに、安定した状態で且つ波浪等によって移動、破壊が生じないように設置できるものであればよく、例えば、コンクリート、セメント、鋼材等の金属、プラスチック又はこれらの材質を2つ以上組み合わせたもの等から形成することができる。とりわけ本発明に係る消波体1は、製造の容易性、設置したときの安定性、製造コスト等の点から、コンクリートで一体に成形することが望ましく、コンクリート製である場合は、更に鉄骨、繊維補強材等によって補強することが好ましい。
【0012】
また、消波体1の製造方法も特に制限されず、消波体1を構成する材質の種類や消波体1の形状等に応じて適宜決めればよい。消波体1がコンクリート製である場合は、従来のコンクリート製消波体等と同様に、例えば、型枠を用いて成型することにより、簡単に且つ経済的に製造することができる。
【0013】
消波体1に設置される固定杭3には、好ましくはその中途から長さ方向に伸びて先端に開口する水路4が貫設され、先端開口部が噴射ノズル5とされる。この固定杭3の水路4に外部からホース6が接続されることにより、外部からの高圧水を供給して噴射ノズル5から噴射可能にされる。
【0014】
例えば固定杭3は、図2に示すような方法で、消波体1の後部に一体的に設けた固定杭取付部7に取り付けることができる。即ち、固定杭3の上部にくびれ部8aを設けた挿入部8を形成し、固定杭取付部7に、挿入部8を挿入するための挿入孔9を設ける。そして、挿入孔9の中間部に抉り部10を設けると共に、抉り部10から外側面に抜ける注入路11を形成する。
【0015】
固定杭3の取り付けに当っては、その挿入部8を挿入孔9内に挿入した後、注入路11から樹脂モルタル等の接合剤12を注入する。接合剤12は、抉り部10とくびれ部8aとで形成される断面ダイヤ形の環溝を充填し、固化する。かくして、固定杭3が固定杭取付部7から抜けることなく、確固と固定される。
【0016】
固定杭3は、本装置の、設置高さ調整を含めた海底への設置作業を容易且つ迅速に行なわせるためのもので、設置作業に際しては、消波体1の外側面に吊下手段13を設け、これにクレーンフック14を掛けて吊るし、海底に降ろしながら水路4内に高圧水を供給する。
【0017】
供給された高圧水は、水路先端の噴射ノズル5から海底に向けて噴射され、その部分の砂を吹き上げる。これにより、固定杭3の埋設孔が形成されるので、そのまま消波体1を降ろしていけば、固定杭3はその埋設孔内に容易且つスムーズに進入していく。固定杭3を所望部位まで埋入させたところで、高圧水の供給を止めると共にクレーンフック14を外すが、その後直ちに固定杭3の回りの砂が締まるため、固定杭3は確固と固定される。
【0018】
なお、固定杭3の中間部に、水平方向に広がるストッパー15を設けておけば、設置時において回りの砂が締まる前に固定杭3が沈下することが、確実に防止される。
【0019】
また、消波体1の設置場所を移動させる場合や、消波体1の海底からの高さ調整をするような場合にも、同様に固定杭3の水路4に高圧水を供給すれば、周囲の砂が吹き崩されるので、容易に引き上げ、また、引き抜くことが可能となる。
【0020】
図3は、本発明に係る消波装置の設置例を示すもので、そこでは、多数の消波装置が適宜間隔を置いて並置されている。その設置位置は、巻波が崩れる通常位置、より詳細には、干潮時において巻波が崩れる位置よりも少し沖合とする。
【0021】
その場合、各消波体1の開口部2は、波の進行方向に向かって斜め上向きに開放されているので、到来する波が消波体1に衝突すると、その一部は開口部2から流入して、消波体1の内壁面に沿って上方に翻転する(図2(A)における湾曲矢印参照)。この翻転して逆方向に向かう水流が、次に到来してくる巻波と衝突する結果、巻波は通常よりも早く崩され、以て、波による砂浜の侵蝕が極力抑えられ、砂浜が育成維持される。
【0022】
【発明の効果】
本発明は上述した通りであって、本発明によれば、単純な方法及び構造であって、装置自体のコスト及び設置コストが比較的低廉で、しかも確実に砂浜の育成及び維持を実現でき、人工渚の造成も容易となる効果がある。
【図面の簡単な説明】
【図1】 本発明に係る砂浜育成装置の一実施例の斜視図である。
【図2】 本発明に係る砂浜育成装置における固定杭の取付方法を示す図である。
【図3】 本発明に係る砂浜育成装置の使用状態図である。
【符号の説明】
1 消波体
2 開口部
3 固定杭
4 水路
5 噴射ノズル
6 ホース
7 固定杭取付部
8 挿入部
8a くびれ部
9 挿入孔
10 抉り部
11 注入路
12 接合剤
13 吊下手段
14 クレーンフック
15 ストッパー
[0001]
[Technical field to which the invention belongs]
The present invention relates to a sandy beach growing apparatus , and more particularly to a sandy beach growing apparatus for artificially protecting and growing a sandy beach that is naturally created and eroded by waves that come in.
[0002]
[Prior art]
Sandy beaches are naturally created by sand and shell fragments that are carried by the constantly rushing waves. However, sand beaches once created are often eroded by waves.
[0003]
In other words, the waves generated offshore proceed as a winding wave from the depth near the sandy beach to the shallow water, making a vortex from one end of the wave spreading to the left and right, and breaking down. The sand is eroded because the sand is rolled up and carried away when the waves are drawn.
[0004]
Therefore, to cultivate a sandy beach, it is only necessary to break the winding waves at a point as far away from the sandy beach as possible so as not to erode the sandy beach. The idea is not advocated.
[0005]
[Problems to be solved by the invention]
The present invention has been made in order to grow sandy beaches from the above viewpoint, and has a simple method and structure, the cost of the apparatus itself and the installation cost are relatively low, and it is possible to reliably grow and maintain sandy beaches. It is an object of the present invention to provide a sand beach growing device to be obtained.
[0006]
[Means for Solving the Problems]
A sandy beach breeding apparatus according to the present invention for solving the above problems is a wave-dissipating body having a semi-cylindrical shape having a front surface and both ends opened to be directed to waves during offshore installation and extending downward. The fixed pile is formed with a water channel extending from the upper part to the lower end, and high pressure water is supplied to the water channel from the outside and can be ejected from the tip .
[0007]
The front opening of the wave-dissipating body is opened slightly upward.
[0008]
Preferably, the intermediate portion of the front Symbol fixed piles, providing a flange-like stopper for preventing subsidence during installation.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a configuration of a sandy beach growing apparatus according to the present invention. This apparatus comprises a wave-dissipating body 1 and usually two fixed piles 3. The wave-dissipating body 1 has a C-shaped, semi-circular, semi-polygonal cross-section with a semi-cylindrical shape that opens both ends and the front, and the front opening 2 that faces the wave when installed offshore is slightly inclined upward. It is preferable. The wave absorber 1 is fixed offshore via a fixed pile 3 extending downward .
[0010]
The length and diameter of the wave-dissipating body 1 are not particularly limited, but taking into account various conditions such as the difference in water depth when the wave-dissipating device is constructed and the water waves in the water area where the wave-dissipating device is constructed. In general, a range of 3 to 15 m in length and 1 to 3 m in diameter is appropriate from the standpoints of the wave-dissipating function, ease of handling, ease of installation, ease of manufacture, etc. Of course, it is not limited to this size.
[0011]
The material of the wave-dissipating body 1 is not particularly limited as long as it can be installed in a stable state so that the wave-dissipating body 1 does not move or break due to waves or the like. For example, concrete, cement, steel, etc. It can be formed from metal, plastic, or a combination of two or more of these materials. In particular, the wave-dissipating body 1 according to the present invention is desirably formed integrally with concrete from the viewpoint of ease of production, stability when installed, production cost, and the like. It is preferable to reinforce with a fiber reinforcing material or the like.
[0012]
Moreover, the manufacturing method of the wave-dissipating body 1 is not particularly limited, and may be appropriately determined according to the type of material constituting the wave-dissipating body 1, the shape of the wave-dissipating body 1, and the like. When the wave-dissipating body 1 is made of concrete, it can be manufactured easily and economically by molding using, for example, a mold like the conventional concrete-made wave-dissipating body.
[0013]
The fixed pile 3 installed in the wave-dissipating body 1 is preferably provided with a water channel 4 extending in the length direction from the middle and opening at the tip, and the tip opening is used as the injection nozzle 5. By connecting a hose 6 from the outside to the water channel 4 of the fixed pile 3, high-pressure water from the outside is supplied to enable injection from the injection nozzle 5.
[0014]
For example, the fixed pile 3 can be attached to the fixed pile attaching portion 7 provided integrally with the rear portion of the wave-dissipating body 1 by a method as shown in FIG. That is, the insertion part 8 provided with the constricted part 8 a is formed in the upper part of the fixed pile 3, and the insertion hole 9 for inserting the insertion part 8 is provided in the fixed pile attachment part 7. And while providing the turning part 10 in the intermediate part of the insertion hole 9, the injection path 11 which escapes from the turning part 10 to an outer surface is formed.
[0015]
In attaching the fixed pile 3, the insertion portion 8 is inserted into the insertion hole 9, and then a bonding agent 12 such as resin mortar is injected from the injection path 11. The bonding agent 12 fills and solidifies an annular groove having a diamond shape in cross section formed by the bent portion 10 and the constricted portion 8a. Thus, the fixed pile 3 is firmly fixed without coming out of the fixed pile attaching portion 7.
[0016]
The fixed pile 3 is for making the installation work on the seabed including the installation height adjustment of the apparatus easy and quick. During the installation work, the suspension means 13 is hung on the outer surface of the wave-dissipating body 1. The crane hook 14 is hung on this and suspended, and high pressure water is supplied into the water channel 4 while being lowered to the seabed.
[0017]
The supplied high-pressure water is jetted from the jet nozzle 5 at the tip of the water channel toward the seabed, and blows up sand at that portion. Thereby, since the embedding hole of the fixed pile 3 is formed, if the wave-dissipating body 1 is lowered as it is, the fixed pile 3 enters the embedded hole easily and smoothly. When the fixed pile 3 is embedded to a desired site, the supply of high-pressure water is stopped and the crane hook 14 is removed. However, since the sand around the fixed pile 3 is immediately tightened, the fixed pile 3 is firmly fixed.
[0018]
In addition, if the stopper 15 which spreads in a horizontal direction is provided in the intermediate part of the fixed pile 3, it will be surely prevented that the fixed pile 3 sinks before the surrounding sand is tightened at the time of installation.
[0019]
Moreover, when moving the installation place of the wave-dissipating body 1 or adjusting the height of the wave-dissipating body 1 from the seabed, if high-pressure water is supplied to the water channel 4 of the fixed pile 3 in the same manner, Since the surrounding sand is blown away, it can be easily pulled up and pulled out.
[0020]
FIG. 3 shows an installation example of the wave-dissipating device according to the present invention, in which a large number of wave-dissipating devices are juxtaposed at appropriate intervals. The installation position is a normal position where the winding wave collapses, more specifically, a little offshore than the position where the winding wave collapses at low tide.
[0021]
In that case, since the opening 2 of each wave-dissipating body 1 is opened obliquely upward in the wave traveling direction, when an incoming wave collides with the wave-dissipating body 1, a part of the opening 2 extends from the opening 2. It flows in and turns upward along the inner wall surface of the wave-dissipating body 1 (see the curved arrow in FIG. 2A). As a result of this reversing water flow in the opposite direction colliding with the next incoming winding wave, the winding wave is broken earlier than usual, so that the erosion of the sand beach by the wave is suppressed as much as possible, Raised and maintained.
[0022]
【The invention's effect】
The present invention is as described above, and according to the present invention, it is a simple method and structure, the cost of the device itself and the installation cost are relatively low, and it is possible to reliably realize the growth and maintenance of sand beaches, This also has the effect of facilitating the creation of artificial jars.
[Brief description of the drawings]
FIG. 1 is a perspective view of an embodiment of a sand beach growing apparatus according to the present invention.
FIG. 2 is a view showing a method for attaching a fixed pile in the sandy beach growing apparatus according to the present invention.
FIG. 3 is a diagram showing the state of use of the sand beach growing apparatus according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Wave-dissipating body 2 Opening part 3 Fixed pile 4 Water channel 5 Injection nozzle 6 Hose 7 Fixed pile attachment part 8 Insertion part 8a Constriction part 9 Insertion hole 10 Injection | pouring part 11 Bonding agent 13 Suspension means 14 Crane hook 15 Stopper

Claims (2)

沖合設置時に波に向けられることになる前面及び両端を開口した半筒状であって、下方に延びる固定杭を備えた消波体を設け、前記消波体の前面開口部は、若干斜め上向きに開口され、前記固定杭にはその上部から下端に抜ける水路が形成され、前記水路には、外部から高圧水が供給されてその先端から噴出可能であることを特徴とする砂浜育成装置。  A semi-cylindrical shape with a front opening and both ends open to be directed to the waves when installed offshore, with a fixed pile extending downward, the front opening of the wave breaking body is slightly upward A sandy beach growing apparatus characterized in that a water channel is formed in the fixed pile and passes from the upper part to the lower end of the fixed pile, and high pressure water is supplied from the outside to the water channel and can be ejected from the tip. 前記固定杭の中間部に、設置時における沈下を防止するためのフランジ状ストッパーを設けた請求項1に記載の砂浜育成装置。  The sandy beach cultivation apparatus of Claim 1 which provided the flange-shaped stopper for preventing the settlement at the time of installation in the intermediate part of the said fixed pile.
JP2002036733A 2002-02-14 2002-02-14 Sandy beach cultivation method and apparatus Expired - Lifetime JP3781685B2 (en)

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