JP2004360304A

JP2004360304A - Water-borne shock absorbing structure

Info

Publication number: JP2004360304A
Application number: JP2003160288A
Authority: JP
Inventors: Shinkichi Tanigaki; 信吉谷垣
Original assignee: Mitsubishi Heavy Industries Ltd
Current assignee: Mitsubishi Heavy Industries Ltd
Priority date: 2003-06-05
Filing date: 2003-06-05
Publication date: 2004-12-24

Abstract

<P>PROBLEM TO BE SOLVED: To effectively absorb impact force, when a driftage collides. <P>SOLUTION: A cylindrical member 2 is formed of a flexible and water impermeable film material, and injection water 6 is injected inside. At this time, a water surface 6b is above a water surface 5b such as the sea being an installation place. A shape of the cylindrical member 2 is held in a cylindrical shape by a shape holding column 3, and a cable 4 having rigidity. When the driftage collides with the cylindrical member 2, the cylindrical member 2 is deflected and recessed, and absorbs the impact force. When the cylindrical member 2 is recessed, a water level of the injection water 6 rises, and water pressure increases. The recessed part is pushed back outside by the increased water pressure, and the cylindrical member 2 is restored to the cylindrical shape. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は水上緩衝構造物に関し、船舶等が衝突した際に衝撃力を効果的に緩衝しつつも、船舶等を押し戻す適切な回復力も併せ持ち、しかも、簡便に設置や取外しすることができるように工夫したものである。
【０００２】
【従来の技術】
河川にはバージ船などが航行することがあるが、このバージ船が橋脚に衝突して橋が崩壊する事故が発生したことがあった（米国において）。このような事故に対処する対策としては、橋脚を強固にする以外に具体的な手だてがない。
【０００３】
このような問題は、河川の橋梁だけでなく、港湾域においても想定される。港湾域では、台風や津波によって係船ロープがはずれて船が湾内に漂流するおそれがあり、このような場合には、漂流した船が防波堤などの湾内構造物に衝突して堤防等を破壊するおそれがある。しかし、橋梁や湾内構造物の被害を軽減するための簡便な構造物は現在のところ存在していない。
【０００４】
なお、船舶が岸壁に接岸する際の衝撃を緩和するために、岸壁には防舷材が固定設置される。一般的な防舷材は、弾性材により構成されており、主にこの弾性材の弾性力を利用して緩衝を行っている（例えば特許文献１，２参照）。
また、柔らかな中空胴体に弁を備えると共に、中空胴体中に海水を入れ、衝突時には中空胴体中の海水が弁を通って排出されるときの流体抵抗を利用して、緩衝を行う防舷材も存在する（例えば特許文献３参照）。
【０００５】
【特許文献１】
特開昭６１−２０７７０５号公報
【特許文献２】
実開昭５２−７５３９３号公報
【特許文献３】
実開昭５６−３３３２６号公報
【０００６】
【発明が解決しようとする課題】
しかし、防舷材は岸壁等に固定設置するものであり、簡便に設置や取外しをすることはできない。また、船舶等が衝突した際に衝撃力を効果的に緩衝しつつも、船舶等を押し戻す適切な回復力も併せ持たせることは困難であった。
【０００７】
本発明は、上記従来技術に鑑み、設置や取外しが簡便にできると共に、衝撃力を効果的に緩衝しつつも、衝突物を押し戻す適切な回復力も併せ持った水上緩衝構造物を提供することを目的とする。
【０００８】
【課題を解決するための手段】
上記課題を解決する本発明の構成は、水を透過させない柔軟な膜材により、有底の筒形状に形成されており、内部に注入される注入水の水面が、設置場所である河川や湖沼や海の水面よりも高くなるまで、注入水が注入される筒部材を有することを特徴とする。
【０００９】
また本発明の構成は、水を透過させない柔軟な膜材により、有底の筒形状に形成されており、内部に注入される注入水の水面が、設置場所である河川や湖沼や海の水面よりも高くなるまで、注入水が注入される筒部材と、
前記筒部材の高さ方向に沿って配置されており、前記筒部材を上下方向に伸びばした状態で形状を保持する形状保持支柱と、
前記筒部材の高さ方向の複数箇所において、筒部材の周方向に沿い配置されて、前記筒部材の周方向形状を保持する周方向形状保持手段と、を有することを特徴とする。
【００１０】
また本発明の構成は、前記筒部材は、上方に向かうに従い横断面積が次第に狭まる形状になっていたり、
前記筒部材は、上方に向かうに従い横断面積が段階的に狭まる形状になっていたり、
前記筒部材の頂部には、前記注入水に浮かぶ浮力体が取り付けられていたり、前記筒部材は底面のみならず上面も閉塞されていることを特徴とする。
【００１１】
【発明の実施の形態】
以下に本発明の実施の形態を図面に基づき詳細に説明する。
【００１２】
＜第１の実施の形態＞
図１は本発明の第１の実施の形態に係る水上緩衝構造物１を水中に設置した状態で示す断面図であり、図２はその斜視図である。この水上緩衝構造物１は、筒部材２を主体にしたものである。この筒部材２は、底面が閉塞すると共に上面が開口した筒形状となっており、柔軟な膜材により形成されている。膜材としては、例えば、ポリテトラフルオルエチレン膜や、アラミド繊維膜や、ＦＲＰ膜などの柔軟で、且つ、水を透過させない膜を採用する。
【００１３】
この筒部材２の内周側には、筒部材２の高さ方向に沿って形状保持支柱３が配置されており、筒部材２はその内周面の高さ方向の複数箇所で、形状保持支柱３で支持されている。このため、筒部材２は高さ方向に関して、上下方向に伸びた状態で形状が保持される。仮に、筒部材２を空気中に置いて形状保持部材３を外してしまうと、柔軟な筒部材２は上下方向に関して萎んで（潰れて）しまい、高さ方向に伸びた形状とはならない。
【００１４】
更に、筒部材２の高さ方向の複数箇所には、筒部材２の外周面を一周する状態でケーブル４が配置されている。ケーブル４は、剛性を有する鉄鋼材や樹脂材によりリング状に形成されたものであり、周方向形状保持手段として機能している。したがって、このケーブル４により、筒部材２の周方向の形状（リング形状）が保持される。
【００１５】
このような構造となっている水上緩衝構造物１では、筒部材２は外部から漂流物等が衝突すると撓んで凹むことができる。また、筒部材２はその撓みが許容する範囲で、上下方向に伸縮することができる。
【００１６】
かかる水上緩衝構造物１は、図１に示すように、河川や湖沼や海などの水５中に設置される。つまり、筒部材２の底面が水底５ａに載置され、筒部材２の上面が水面５ｂよりも上方に位置するように設置される。そして、筒部材２の内部空間には、注入水（河川水や湖沼水や海水を注入したもの）６が注入される。この場合、注入水６の水面６ｂが、河川や海等の水５の水面５ｂよりも上方になるように、注入水６を注入する。
【００１７】
例えば橋脚を保護するためには、図１に示す状態の水上緩衝構造物１を、橋脚の周囲に配置する。水上緩衝構造物１は、ロープ等により橋脚に緊縛などして位置固定する。
【００１８】
河川を流れてきた漂流物等が筒部材２に衝突すると、筒部材２は撓んで凹む。このため漂流物等の衝撃を緩和することができる。また、筒部材２が撓んで凹むことにより、注入水６の水面６ｂが定常状態の水位αから上方の水位βにまで上昇する（図１参照）。このように水面６ｂが上昇すると注入水６の水圧が高くなり、一旦は凹んだ筒部材２は注入水６の水圧により外周側に押し戻されて形状は筒状に回復する。結局、衝突した漂流物等は筒部材２を凹ましつつ緩衝され、その後に、筒部材２から押し戻される。かくして、漂流物等の衝突による衝撃を緩和することができ、橋脚等の保護をすることができる。
【００１９】
なお、筒部材２の外周面のうち、漂流物が衝突し易い面に、滑り易い材料で形成した受衝板を設けるようにしてもよい。また、筒部材２の周方向の形状（リング形状）を保持するためには、ケーブル４の代わりにリング状パイプ等を用いることもできる。
また、筒部材２に、自己形状保持ができる（筒型形状が保持できる）程度の剛性を持たせるようにした場合には、形状保持支柱３やケーブル４は無くてもよい。筒部材２に自己形状保持機能を持たせる手法としては、筒部材２の全体を厚くしたり、一部（上下方向に伸びる一部分）を厚くしたり、全体を剛性の高い材料で形成したりする方法を採用することができる。
更に、筒部材２としては、底面のみならず、上面をも閉塞したものを採用することができる。また更に、筒部材２の筒形状としては、円筒形のみならず角筒形にしても良い。
この水上緩衝構造物１は、防舷材として使用することもでき、また緊急時に船や浮体に取り付けることもできる。
【００２０】
＜第２の実施の形態＞
図３及び図４は本発明の第２の実施の形態に係る水上緩衝構造物１Ａを水中に設置した状態で示す断面図である。この水上緩衝構造物１Ａの基本構造は、図１及び図２に示す第１の実施の形態と同様であるので、第１の実施の形態と異なる部分を中心に説明をする。
【００２１】
この水上緩衝構造物１Ａは、筒部材２を主体にしたものである。この筒部材２は、底面が閉塞すると共に上面が開口した筒形状となっており、柔軟な膜材により形成されている。膜材としては、例えば、ポリテトラフルオルエチレン膜や、アラミド繊維膜や、ＦＲＰ膜などの柔軟で、且つ、水を透過させない膜を採用する。
【００２２】
この筒部材２の内周側には、形状保持支柱３Ａが配置されている。この形状保持支柱３Ａは、筒部材２の底面から上方に向かって真っ直ぐに配置されているが、その頂部が筒部材２の上端面にまでは達していない長さとなっている。そして、高さ方向（深さ方向）に関して、形状保持支柱３Ａが存在する部分において、筒部材２はその内周面の高さ方向の複数箇所で、形状保持支柱３で支持されている。このため、高さ方向（深さ方向）に関して、形状保持支柱３Ａが存在する部分においては、筒部材２は高さ方向に関して、上下方向に伸びた状態で形状が保持される。
【００２３】
筒部材２の内周面の頂部には、浮力体７が取り付けられている。このように、浮力体７を取り付けていることが、第２の実施の形態の工夫点である。
【００２４】
筒部材２の内部空間に、注入水（河川水や湖沼水や海水を注入したもの）６を注入し、注入水６の水面６ｂを、河川や海等の水５の水面５ｂよりも上方になるようにする。そうすると、浮力体７が注入水６の水面６ｂに浮かび、これにより、筒部材２の頂部は水面６ｂよりもやや上方に位置する。
【００２５】
図４に示すように、河川を流れてきた漂流物等８が筒部材２に衝突すると、筒部材２は撓んで凹む。このため漂流物等８の衝撃を緩和することができる。また、筒部材２が撓んで凹むことにより、注入水６の水面６ｂが上昇する。このように水面６ｂが上昇すると、これに伴い浮力体７ひいては筒部材２の頂部が上昇し、筒部材２のうち、形状保持支柱３Ａよりも上側にある部分が上方に伸びる。
【００２６】
注入水６の水面６ｂが上昇すると注入水６の水圧が高くなり、一旦は凹んだ筒部材２は注入水６の水圧により外周側に押し戻されて形状は筒状に回復する。これに伴い浮力体７ひいては筒部材２の頂部が下降する。結局、衝突した漂流物等８は筒部材２を凹ましつつ緩衝され、その後に、筒部材２から押し戻される。かくして、漂流物等８の衝突による衝撃を緩和することができ、橋脚等の保護をすることができる。
【００２７】
なお、筒部材２の外周面のうち、漂流物が衝突し易い面に、滑り易い材料で形成した受衝板を設けるようにしてもよい。また、筒部材２の周方向の形状（リング形状）を保持するためには、ケーブル４の代わりにリング状パイプ等を用いることもできる。
また、筒部材２に、自己形状保持ができる（筒型形状が保持できる）程度の剛性を持たせるようにした場合には、形状保持支柱３やケーブル４は無くてもよい。筒部材２に自己形状保持機能を持たせる手法としては、筒部材２の全体を厚くしたり、一部（上下方向に伸びる一部分）を厚くしたり、全体を剛性の高い材料で形成したりする方法を採用することができる。
更に、筒部材２としては、底面のみならず、上面をも閉塞したものを採用することができる。また更に、筒部材２の筒形状としては、円筒形のみならず角筒形にしても良い。
この水上緩衝構造物１Ａは、防舷材として使用することもでき、また緊急時に船や浮体に取り付けることもできる。
【００２８】
＜第３の実施の形態＞
図５，図６は本発明の第３の実施の形態にかかる水上緩衝構造物１１を示す。この水上緩衝構造物１１の基本構成は、図１，図２に示す第１の実施の形態と同様であるが、ケーブル１４の配置数を多くしている。
【００２９】
この水上緩衝構造物１１は、筒部材１２を主体にしたものであり、筒部材１２の形状は、形状保持支柱１３や多数のケーブル１４により保持されている。筒部材１２は、底面が閉塞すると共に上面が開口した筒形状となっており、柔軟な膜材により形成されている。膜材としては、例えば、ポリテトラフルオルエチレン膜や、アラミド繊維膜や、ＦＲＰ膜などの柔軟で、且つ、水を透過させない膜を採用する。
【００３０】
そして、筒部材１２内には、注入水１６が注入されている。注入水１６の水面１６ａは、海の水１５の水面１５ａよりも高くしている。かかる水上緩衝構造物１１は、堤防１７に取り付けられる。
【００３１】
図６に示すように、船１８が筒部材１２に衝突すると、筒部材１２は撓んで凹む。このため船１８の衝撃を緩和することができる。また、筒部材１２が撓んで凹むことにより、注入水１６の水面１６ｂが上昇する。
【００３２】
注入水１６の水面１６ｂが上昇すると注入水１６の水圧が高くなり、一旦は凹んだ筒部材１２は注入水１６の水圧により外周側に押し戻されて形状は筒状に回復する。結局、衝突した船１８は筒部材１２を凹ましつつ緩衝され、その後に、筒部材１２から押し戻される。かくして、船１８の衝突による衝撃を緩和することができ、堤防１７の保護をすることができる。
【００３３】
なお、筒部材１２の外周面のうち、漂流物が衝突し易い面に、滑り易い材料で形成した受衝板を設けるようにしてもよい。また、筒部材１２の周方向の形状（リング形状）を保持するためには、ケーブル１４の代わりにリング状パイプ等を用いることもできる。
また、筒部材１２に、自己形状保持ができる（筒型形状が保持できる）程度の剛性を持たせるようにした場合には、形状保持支柱１３やケーブル１４は無くてもよい。筒部材１２に自己形状保持機能を持たせる手法としては、筒部材１２の全体を厚くしたり、一部（上下方向に伸びる一部分）を厚くしたり、全体を剛性の高い材料で形成したりする方法を採用することができる。
更に、筒部材１２としては、底面のみならず、上面をも閉塞したものを採用することができる。また更に、筒部材１２の筒形状としては、円筒形のみならず角筒形にしても良い。
この水上緩衝構造物１１は、防舷材として使用することもでき、また緊急時に船や浮体に取り付けることもできる。
【００３４】
＜第４の実施の形態＞
図７は本発明の第４の実施の形態にかかる水上緩衝構造物１１Ａを示す。この水上緩衝構造物１１Ａでは、筒部材１２Ａは、上方に向かうに従い横断面積（水平面に対して平行な断面の面積）が次第に狭まるような形状となっている。筒部材１２Ａは、底面が閉塞すると共に上面が開口した筒形状となっており、柔軟な膜材により形成されている。膜材としては、例えば、ポリテトラフルオルエチレン膜や、アラミド繊維膜や、ＦＲＰ膜などの柔軟で、且つ、水を透過させない膜を採用する。
【００３５】
また形状保持支柱１３Ａは、傾斜した筒部材１２Ａを支持できるように、三角形状になっている。筒部材１２Ａの周方向形状は、ケーブル１４により保持されている。そして、筒部材１２Ａの内部に注入水１６が注入される。
【００３６】
漂流物等が筒部材１２Ａに衝突すると、筒部材１２Ａは撓んで凹む。このため漂流物等の衝撃を緩和することができる。また、筒部材１２Ａが撓んで凹むことにより、注入水１６の水面１６ｂが上昇して水圧が高くなる。このとき、筒部材１２Ａは、上方に向かうに従い次第に横断面積が狭まるような形状となっているため、上方に向かうに従い水面１６ｂは上昇しやすくなっている。このように水面１６ｂが上昇しやすくなっているため、注入水１６の水圧も上昇しやすくなっており、一旦は凹んだ筒部材１２Ａは注入水１６の上昇した水圧により外周側に押し戻されて形状は筒状に回復する。結局、衝突した漂流物等は筒部材１２Ａを凹ましつつ緩衝され、その後に、筒部材１２Ａから押し戻される。かくして、漂流物等の衝突による衝撃を緩和することができ、橋脚等の保護をすることができる。
【００３７】
本実施の形態では、漂流物等が筒部材１２Ａに衝突した初期では、筒部材１２Ａからの反発力は小さいが、水面１６ｂは上方に向かうに従い上昇し易くなっており急激に水圧が高くなるので、水面１６ｂが上方に向かうに従い筒部材１２Ａからの反発力が急激に上昇する。このため、より効果的に衝撃を緩衝できると共に、漂流物等を確実に押し戻すことができる。
【００３８】
なお、筒部材１２Ａの外周面のうち、漂流物が衝突し易い面に、滑り易い材料で形成した受衝板を設けるようにしてもよい。また、筒部材１２Ａの周方向の形状（リング形状）を保持するためには、ケーブル１４の代わりにリング状パイプ等を用いることもできる。
また、筒部材１２Ａに、自己形状保持ができる（筒型形状が保持できる）程度の剛性を持たせるようにした場合には、形状保持支柱１３Ａやケーブル１４は無くてもよい。筒部材１２Ａに自己形状保持機能を持たせる手法としては、筒部材１２Ａの全体を厚くしたり、一部（上下方向に伸びる一部分）を厚くしたり、全体を剛性の高い材料で形成したりする方法を採用することができる。
更に、筒部材１２Ａとしては、底面のみならず、上面をも閉塞したものを採用することができる。また更に、筒部材１２Ａの筒形状としては、円筒形のみならず角筒形にしても良い。
この水上緩衝構造物１１Ａは、防舷材として使用することもでき、また緊急時に船や浮体に取り付けることもできる。
【００３９】
＜第５の実施の形態＞
図８は本発明の第５の実施の形態にかかる水上緩衝構造物１１Ｂを示す。この水上緩衝構造物１１Ｂでは、筒部材１２Ｂは、上方に向かうに従い横断面積（水平面に対して平行な断面の面積）が段階的に狭まるような形状となっている。本例では、筒部材１２Ｂは広面積の下段側と、狭面積の上段側の２段になっている。筒部材１２Ｂは、底面が閉塞すると共に上面が開口した筒形状となっており、柔軟な膜材により形成されている。膜材としては、例えば、ポリテトラフルオルエチレン膜や、アラミド繊維膜や、ＦＲＰ膜などの柔軟で、且つ、水を透過させない膜を採用する。
【００４０】
また２本の形状保持支柱１３Ｂ_１と形状保持支柱１３Ｂ_２により、段階形状となっている筒部材１２Ｂを支持している。筒部材１２Ｂの周方向形状は、ケーブル１４により保持されている。そして、筒部材１２Ｂの内部に注入水１６が注入される。
【００４１】
漂流物等が筒部材１２Ｂに衝突すると、筒部材１２Ｂは撓んで凹む。このため漂流物等の衝撃を緩和することができる。また、筒部材１２Ｂが撓んで凹むことにより、注入水１６の水面１６ｂが上昇する。このとき、筒部材１２Ｂは、上方に向かうに従い段階的に横断面積が狭まるような形状となっているため、特に上段側で水面１６ｂは上昇しやすくなっている。このように水面１６ｂが上昇しやすくなっているため、注入水１６の水圧も上昇しやすくなっており、一旦は凹んだ筒部材１２Ｂは注入水１６の上昇した水圧により外周側に押し戻されて形状は筒状に回復する。結局、衝突した漂流物等は筒部材１２Ｂを凹ましつつ緩衝され、その後に、筒部材１２Ｂから押し戻される。かくして、漂流物等の衝突による衝撃を緩和することができ、橋脚等の保護をすることができる。
【００４２】
本実施の形態では、漂流物等が筒部材１２Ｂに衝突した初期では、筒部材１２Ｂからの反発力は小さいが、水面１６ｂは上方に向かうに従い上昇し易くなっており急激に水圧が高くなるので、水面１６ｂが上方に向かうに従い筒部材１２Ａからの反発力が急激に上昇する。このため、より効果的に衝撃を緩衝できると共に、漂流物等を確実に押し戻すことができる。
【００４３】
なお、筒部材１２Ｂの外周面のうち、漂流物が衝突し易い面に、滑り易い材料で形成した受衝板を設けるようにしてもよい。また、筒部材１２Ｂの周方向の形状（リング形状）を保持するためには、ケーブル１４の代わりにリング状パイプ等を用いることもできる。
また、筒部材１２Ｂに、自己形状保持ができる（筒型形状が保持できる）程度の剛性を持たせるようにした場合には、形状保持支柱１３Ｂ_１，１３Ｂ_２やケーブル１４は無くてもよい。筒部材１２Ｂに自己形状保持機能を持たせる手法としては、筒部材１２Ｂの全体を厚くしたり、一部（上下方向に伸びる一部分）を厚くしたり、全体を剛性の高い材料で形成したりする方法を採用することができる。
更に、筒部材１２Ｂとしては、底面のみならず、上面をも閉塞したものを採用することができる。また更に、筒部材１２Ｂの筒形状としては、円筒形のみならず角筒形にしても良い。
この水上緩衝構造物１１Ｂは、防舷材として使用することもでき、また緊急時に船や浮体に取り付けることもできる。
【００４４】
【発明の効果】
以上、実施の形態と共に具体的に説明したように、本発明の水上緩衝構造物では、水を透過させない柔軟な膜材により、有底の筒形状に形成されており、内部に注入される注入水の水面が、設置場所である河川や湖沼や海の水面よりも高くなるまで、注入水が注入される筒部材を有する構成にした。
このため、漂流物等が筒部材に衝突すると、筒部材は撓んで凹み、衝撃力を緩衝する。また、筒部材が凹むことにより注入水の水位が上昇して注入水圧力が高くなり、凹んだ筒部材は水圧により外側に押し戻されて形状が筒状に回復し、衝突した漂流物を押し戻すことができる。このため、保護すべき構造物に本願発明の水上緩衝構造物を配置することにより、保護すべき構造物が、漂流物等の衝撃を受けることを防止することができる。また、本発明の水上緩衝構造物は必要な場所に簡単に設置することができる。
【００４５】
また本発明の水上緩衝構造物では、水を透過させない柔軟な膜材により、有底の筒形状に形成されており、内部に注入される注入水の水面が、設置場所である河川や湖沼や海の水面よりも高くなるまで、注入水が注入される筒部材と、前記筒部材の高さ方向に沿って配置されており、前記筒部材を上下方向に伸びばした状態で形状を保持する形状保持支柱と、前記筒部材の高さ方向の複数箇所において、筒部材の周方向に沿い配置されて、前記筒部材の周方向形状を保持する周方向形状保持手段とを有する構成にした。
このため、漂流物等が筒部材に衝突すると、筒部材は撓んで凹み、衝撃力を緩衝する。また、筒部材が凹むことにより注入水の水位が上昇して注入水圧力が高くなり、凹んだ筒部材は水圧により外側に押し戻されて形状が筒状に回復し、衝突した漂流物を押し戻すことができる。このため、保護すべき構造物に本願発明の水上緩衝構造物を配置することにより、保護すべき構造物が、漂流物等の衝撃を受けることを防止することができる。また、本発明の水上緩衝構造物は必要な場所に簡単に設置することができる。
更に、形状保持支柱と周方向形状保持手段により、筒部材の筒形状を保持することができるので、確実に緩衝を行うことができる。
【００４６】
また本発明の水上緩衝構造物では、筒部材は、上方に向かうに従い横断面積が次第に狭まる形状になっていたり、上方に向かうに従い横断面積が段階的に狭まる形状になっているため、注入水の水位は上方に行くほど上昇しやすくなり、筒部材の形状回復力が向上する。
【００４７】
また、本発明の水上緩衝構造物では、筒部材の頂部には、前記注入水に浮かぶ浮力体が取り付ける構成により、衝突時の筒部材の高さを自動的に調整することができる。また、筒部材は底面のみならず上面も閉塞されている構成にして、形状回復力をより強力にした。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態に係る水上緩衝構造物を示す断面図。
【図２】本発明の第１の実施の形態に係る水上緩衝構造物を示す斜視図。
【図３】本発明の第２の実施の形態に係る水上緩衝構造物を示す断面図。
【図４】本発明の第２の実施の形態に係る水上緩衝構造物を示す断面図。
【図５】本発明の第３の実施の形態に係る水上緩衝構造物を示す断面図。
【図６】本発明の第３の実施の形態に係る水上緩衝構造物を示す断面図。
【図７】本発明の第４の実施の形態に係る水上緩衝構造物を示す断面図。
【図８】本発明の第５の実施の形態に係る水上緩衝構造物を示す断面図。
【符号の説明】
１，１Ａ，１１，１１Ａ，１１Ｂ水上緩衝構造物
２，１２，１２Ａ，１２Ｂ筒部材
３，３Ａ，１３，１３Ａ，１３Ｂ_１，１３Ｂ_２形状保持支柱
４，１４ケーブル
５，１５水
６，１６注入水
６ｂ，１６ｂ水面[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a water-absorbing structure, which, while effectively buffering an impact force when a ship or the like collides, also has an appropriate recovery force to push back the ship or the like, and can be easily installed and removed. It is an ingenuity.
[0002]
[Prior art]
A barge vessel and the like sometimes sail on the river, but this barge vessel collided with a pier and the bridge collapsed in some cases (in the United States). There are no concrete measures to deal with such accidents other than strengthening the piers.
[0003]
Such problems are expected not only in river bridges but also in port areas. In harbor areas, typhoons and tsunamis may cause mooring ropes to slip off and drift in the bay. There is. However, there is currently no simple structure to reduce damage to bridges and structures in the bay.
[0004]
In addition, fenders are fixedly installed on the quay to mitigate the impact when the ship berths at the quay. A general fender is made of an elastic material, and performs buffering mainly using the elastic force of the elastic material (for example, see Patent Documents 1 and 2).
In addition, a valve is provided on the soft hollow body, and seawater is put into the hollow body, and in the event of a collision, a fender that cushions by utilizing fluid resistance when seawater in the hollow body is discharged through the valve (For example, see Patent Document 3).
[0005]
[Patent Document 1]
JP-A-61-207705 [Patent Document 2]
Japanese Utility Model Publication No. 52-75393 [Patent Document 3]
JP-A-56-33326 [0006]
[Problems to be solved by the invention]
However, fenders are fixedly installed on the quay, etc., and cannot be easily installed or removed. In addition, it has been difficult to effectively buffer the impact force when a ship or the like collides, and also have an appropriate recovery force to push the ship or the like back.
[0007]
An object of the present invention is to provide a water buffer structure that can be easily installed and removed in view of the above-described conventional technology, and has an appropriate buffering force that pushes back a collision object while effectively buffering an impact force. And
[0008]
[Means for Solving the Problems]
The configuration of the present invention that solves the above-mentioned problem is formed by a flexible membrane material that does not allow water to permeate, and is formed in a cylindrical shape with a bottom. And a cylinder member into which the injection water is injected until the height becomes higher than the water level of the sea.
[0009]
Further, in the configuration of the present invention, a water-permeable flexible membrane material is formed in a cylindrical shape with a bottom, and the surface of the injected water to be injected into the inside thereof is a surface of a river, a lake, a marsh, or a sea where the installation site is located. Until it is higher than the cylinder member into which the injection water is injected,
A shape holding column that is arranged along the height direction of the cylindrical member and holds the shape in a state where the cylindrical member is extended in the up-down direction,
A plurality of circumferential positions of the cylindrical member are provided along a circumferential direction of the cylindrical member at a plurality of positions in a height direction of the cylindrical member, and a circumferential shape holding means for holding a circumferential shape of the cylindrical member is provided.
[0010]
Further, in the configuration of the present invention, the cylindrical member has a shape in which the cross-sectional area gradually decreases as going upward,
The tubular member has a shape in which the cross-sectional area gradually decreases as going upward,
A buoyant body that floats on the injection water is attached to the top of the cylindrical member, or the cylindrical member is closed not only on the bottom surface but also on the upper surface.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0012]
<First embodiment>
FIG. 1 is a cross-sectional view showing a state in which a water buffer structure 1 according to a first embodiment of the present invention is installed in water, and FIG. 2 is a perspective view thereof. The water buffer structure 1 mainly includes a cylindrical member 2. The cylindrical member 2 has a cylindrical shape with a closed bottom surface and an open top surface, and is formed of a flexible film material. As the membrane material, for example, a flexible and water-impermeable membrane such as a polytetrafluoroethylene membrane, an aramid fiber membrane, or an FRP membrane is employed.
[0013]
On the inner peripheral side of the cylindrical member 2, a shape holding column 3 is arranged along the height direction of the cylindrical member 2, and the cylindrical member 2 is held at a plurality of positions in the height direction of the inner peripheral surface thereof. It is supported by the support 3. For this reason, the shape of the cylindrical member 2 is maintained in a state of extending in the vertical direction with respect to the height direction. If the tubular member 2 is placed in the air and the shape holding member 3 is removed, the flexible tubular member 2 is deflated (crushed) in the vertical direction, and does not have a shape extending in the height direction.
[0014]
Further, cables 4 are arranged at a plurality of positions in the height direction of the tubular member 2 so as to make a round around the outer peripheral surface of the tubular member 2. The cable 4 is formed in a ring shape from a rigid steel or resin material, and functions as a circumferential shape holding unit. Therefore, the circumferential shape (ring shape) of the cylindrical member 2 is maintained by the cable 4.
[0015]
In the water-absorbing structure 1 having such a structure, the cylindrical member 2 can be bent and dented when a drifting object or the like collides from the outside. Further, the cylindrical member 2 can expand and contract in the vertical direction within a range allowed by its bending.
[0016]
As shown in FIG. 1, the water buffer structure 1 is installed in water 5 such as a river, a lake, or the sea. That is, the bottom surface of the tubular member 2 is placed on the water bottom 5a, and the top surface of the tubular member 2 is located above the water surface 5b. Then, injection water (water into which river water, lake water, or seawater is injected) 6 is injected into the internal space of the cylindrical member 2. In this case, the injection water 6 is injected such that the water surface 6b of the injection water 6 is higher than the water surface 5b of the water 5 such as a river or sea.
[0017]
For example, in order to protect a pier, the water buffer structure 1 in the state shown in FIG. 1 is arranged around the pier. The position of the water buffer structure 1 is fixed to the bridge pier with a rope or the like.
[0018]
When a drifting substance or the like flowing through the river collides with the cylindrical member 2, the cylindrical member 2 is bent and dented. For this reason, it is possible to alleviate the impact of drifting objects and the like. Further, when the cylindrical member 2 is bent and dented, the water surface 6b of the injection water 6 rises from the steady-state water level α to the upper water level β (see FIG. 1). When the water surface 6b rises in this manner, the water pressure of the injection water 6 increases, and the once-recessed cylindrical member 2 is pushed back to the outer peripheral side by the water pressure of the injection water 6, and the shape recovers to a cylindrical shape. As a result, the colliding drifting substances and the like are buffered while denting the tubular member 2, and then pushed back from the tubular member 2. Thus, the impact due to the collision of the drifting object or the like can be reduced, and the pier or the like can be protected.
[0019]
In addition, a receiving plate formed of a slippery material may be provided on a surface of the outer peripheral surface of the tubular member 2 where a drifting substance easily collides. Further, in order to maintain the circumferential shape (ring shape) of the cylindrical member 2, a ring-shaped pipe or the like can be used instead of the cable 4.
When the cylindrical member 2 is made rigid enough to hold its own shape (can hold a cylindrical shape), the shape holding column 3 and the cable 4 may be omitted. As a method of giving the cylinder member 2 a self-shape maintaining function, the entire cylinder member 2 is made thicker, a part thereof (a part extending in the vertical direction) is made thicker, or the whole is formed of a highly rigid material. A method can be adopted.
Further, as the cylindrical member 2, one having not only the bottom surface but also the top surface closed can be adopted. Further, the cylindrical shape of the cylindrical member 2 may be not only a cylindrical shape but also a rectangular cylindrical shape.
The water buffer structure 1 can be used as a fender, and can be attached to a ship or a floating body in an emergency.
[0020]
<Second embodiment>
FIG. 3 and FIG. 4 are cross-sectional views showing a state in which the water buffer structure 1A according to the second embodiment of the present invention is installed in water. Since the basic structure of the water buffer structure 1A is the same as that of the first embodiment shown in FIGS. 1 and 2, the description will focus on the parts different from the first embodiment.
[0021]
This water buffer structure 1A is mainly composed of a cylindrical member 2. The cylindrical member 2 has a cylindrical shape with a closed bottom surface and an open top surface, and is formed of a flexible film material. As the membrane material, for example, a flexible and water-impermeable membrane such as a polytetrafluoroethylene membrane, an aramid fiber membrane, or an FRP membrane is employed.
[0022]
On the inner peripheral side of the cylindrical member 2, a shape holding column 3A is arranged. The shape support column 3A is arranged straight upward from the bottom surface of the tubular member 2, but has a length such that the top does not reach the upper end surface of the tubular member 2. In the height direction (depth direction), the cylindrical member 2 is supported by the shape holding columns 3 at a plurality of locations in the height direction of the inner peripheral surface in the portion where the shape holding columns 3A exist. For this reason, in the height direction (depth direction), at the portion where the shape holding column 3A exists, the shape of the cylindrical member 2 is held in a state of extending vertically in the height direction.
[0023]
A buoyant body 7 is attached to the top of the inner peripheral surface of the cylindrical member 2. The fact that the buoyancy member 7 is attached as described above is an ingenious point of the second embodiment.
[0024]
Injection water (water into which river water, lake water, or seawater is injected) 6 is injected into the internal space of the cylindrical member 2, and the water surface 6b of the injection water 6 is raised above the water surface 5b of the water 5 such as a river or sea. To be. Then, the buoyant body 7 floats on the water surface 6b of the injection water 6, whereby the top of the cylindrical member 2 is located slightly above the water surface 6b.
[0025]
As shown in FIG. 4, when a drifting substance 8 flowing through a river collides with the cylindrical member 2, the cylindrical member 2 is bent and dented. Therefore, the impact of the drifting material 8 can be reduced. Moreover, the water surface 6b of the injection water 6 rises because the cylindrical member 2 is bent and dented. When the water surface 6b rises in this manner, the buoyant body 7 and, consequently, the top of the tubular member 2 rise, and the portion of the tubular member 2 that is above the shape holding column 3A extends upward.
[0026]
When the water surface 6b of the injection water 6 rises, the water pressure of the injection water 6 increases, and the once-recessed cylindrical member 2 is pushed back to the outer peripheral side by the water pressure of the injection water 6, and the shape recovers to a cylindrical shape. Along with this, the buoyant body 7 and thus the top of the cylindrical member 2 are lowered. Eventually, the colliding drifting material 8 is buffered while recessing the cylindrical member 2 and then pushed back from the cylindrical member 2. Thus, the impact due to the collision of the drifting object 8 can be reduced, and the pier and the like can be protected.
[0027]
In addition, a receiving plate formed of a slippery material may be provided on a surface of the outer peripheral surface of the tubular member 2 where a drifting substance easily collides. Further, in order to maintain the circumferential shape (ring shape) of the cylindrical member 2, a ring-shaped pipe or the like can be used instead of the cable 4.
When the cylindrical member 2 is made rigid enough to hold its own shape (can hold a cylindrical shape), the shape holding column 3 and the cable 4 may be omitted. As a method of giving the cylinder member 2 a self-shape maintaining function, the entire cylinder member 2 is made thicker, a part thereof (a part extending in the vertical direction) is made thicker, or the whole is formed of a highly rigid material. A method can be adopted.
Further, as the cylindrical member 2, one having not only the bottom surface but also the top surface closed can be adopted. Further, the cylindrical shape of the cylindrical member 2 may be not only a cylindrical shape but also a rectangular cylindrical shape.
The water buffer structure 1A can be used as a fender, and can be attached to a ship or a floating body in an emergency.
[0028]
<Third embodiment>
5 and 6 show a water buffer structure 11 according to a third embodiment of the present invention. The basic structure of the water buffer structure 11 is the same as that of the first embodiment shown in FIGS. 1 and 2, but the number of cables 14 is increased.
[0029]
The water buffer structure 11 is mainly composed of a cylindrical member 12, and the shape of the cylindrical member 12 is held by a shape holding column 13 and a number of cables 14. The cylindrical member 12 has a cylindrical shape with a closed bottom surface and an open top surface, and is formed of a flexible film material. As the membrane material, for example, a flexible and water-impermeable membrane such as a polytetrafluoroethylene membrane, an aramid fiber membrane, or an FRP membrane is employed.
[0030]
Then, the injection water 16 is injected into the cylindrical member 12. The water surface 16 a of the injection water 16 is higher than the water surface 15 a of the sea water 15. The water buffer structure 11 is attached to the embankment 17.
[0031]
As shown in FIG. 6, when the ship 18 collides with the tubular member 12, the tubular member 12 is bent and dented. Therefore, the impact of the boat 18 can be reduced. In addition, the water surface 16b of the injection water 16 rises due to the cylindrical member 12 flexing and denting.
[0032]
When the water surface 16b of the injection water 16 rises, the water pressure of the injection water 16 increases, and the once-recessed cylindrical member 12 is pushed back to the outer peripheral side by the water pressure of the injection water 16, and the shape recovers to a cylindrical shape. Eventually, the colliding ship 18 is buffered while denting the tubular member 12, and then is pushed back from the tubular member 12. Thus, the impact due to the collision of the ship 18 can be reduced, and the embankment 17 can be protected.
[0033]
In addition, a receiving plate made of a slippery material may be provided on a surface of the outer peripheral surface of the tubular member 12 where the drifting substance easily collides. Further, in order to maintain the circumferential shape (ring shape) of the tubular member 12, a ring-shaped pipe or the like can be used instead of the cable 14.
When the cylindrical member 12 is made rigid enough to hold its own shape (can hold a cylindrical shape), the shape holding column 13 and the cable 14 may be omitted. As a method of giving the cylinder member 12 a self-shape maintaining function, the entire cylinder member 12 is made thicker, a part thereof (a part extending in the vertical direction) is made thicker, or the whole is formed of a highly rigid material. A method can be adopted.
Further, as the cylindrical member 12, a member having a closed upper surface as well as the lower surface can be adopted. Further, the cylindrical shape of the cylindrical member 12 may be not only a cylindrical shape but also a rectangular cylindrical shape.
The water buffer structure 11 can be used as a fender, and can be attached to a ship or a floating body in an emergency.
[0034]
<Fourth embodiment>
FIG. 7 shows a water buffer structure 11A according to a fourth embodiment of the present invention. In the water buffer structure 11A, the tubular member 12A has a shape such that a cross-sectional area (an area of a cross section parallel to a horizontal plane) gradually decreases as going upward. The cylindrical member 12A has a cylindrical shape with a closed bottom surface and an open top surface, and is formed of a flexible film material. As the membrane material, for example, a flexible and water-impermeable membrane such as a polytetrafluoroethylene membrane, an aramid fiber membrane, or an FRP membrane is employed.
[0035]
The shape holding column 13A has a triangular shape so as to support the inclined cylindrical member 12A. The circumferential shape of the cylindrical member 12A is held by the cable 14. Then, the injection water 16 is injected into the inside of the cylindrical member 12A.
[0036]
When a drifting object or the like collides with the cylindrical member 12A, the cylindrical member 12A is bent and dented. For this reason, it is possible to alleviate the impact of drifting objects and the like. In addition, when the cylindrical member 12A is bent and dented, the water surface 16b of the injection water 16 rises and the water pressure increases. At this time, since the cross-sectional area of the cylindrical member 12A gradually decreases as it goes upward, the water surface 16b tends to rise as it goes upward. Since the water surface 16b is easily raised in this manner, the water pressure of the injection water 16 is also easily increased, and the cylindrical member 12A, which is once recessed, is pushed back to the outer peripheral side by the increased water pressure of the injection water 16 to have a shape. Recovers into a cylindrical shape. Eventually, the colliding drifting substances and the like are buffered while recessing the cylindrical member 12A, and then pushed back from the cylindrical member 12A. Thus, the impact due to the collision of the drifting object or the like can be reduced, and the pier or the like can be protected.
[0037]
In the present embodiment, in the initial stage when the drifting material or the like collides with the cylindrical member 12A, the repulsive force from the cylindrical member 12A is small, but the water surface 16b tends to rise upward and the water pressure rapidly increases. As the water surface 16b moves upward, the repulsive force from the cylindrical member 12A sharply increases. For this reason, the impact can be buffered more effectively, and the drifting objects and the like can be reliably pushed back.
[0038]
In addition, a receiving plate made of a slippery material may be provided on a surface of the outer peripheral surface of the cylindrical member 12A where a drifting substance easily collides. Further, in order to maintain the circumferential shape (ring shape) of the cylindrical member 12A, a ring-shaped pipe or the like can be used instead of the cable 14.
When the cylindrical member 12A is made rigid enough to hold its own shape (can hold a cylindrical shape), the shape holding column 13A and the cable 14 may be omitted. As a method of giving the cylinder member 12A a self-shape maintaining function, the entire cylinder member 12A is made thicker, a part thereof (a part extending in the vertical direction) is made thicker, or the whole is formed of a highly rigid material. A method can be adopted.
Further, as the cylindrical member 12A, one having not only the bottom surface but also the top surface closed can be employed. Further, the cylindrical shape of the cylindrical member 12A may be not only a cylindrical shape but also a rectangular cylindrical shape.
The water buffer structure 11A can be used as a fender, and can be attached to a ship or a floating body in an emergency.
[0039]
<Fifth embodiment>
FIG. 8 shows a water buffer structure 11B according to a fifth embodiment of the present invention. In the water buffer structure 11B, the tubular member 12B has a shape such that the cross-sectional area (the area of the cross section parallel to the horizontal plane) decreases stepwise as it goes upward. In the present example, the cylindrical member 12B has two steps: a lower part having a large area and an upper part having a small area. The tubular member 12B has a tubular shape with a closed bottom surface and an open top surface, and is formed of a flexible film material. As the membrane material, for example, a flexible and water-impermeable membrane such as a polytetrafluoroethylene membrane, an aramid fiber membrane, or an FRP membrane is employed.
[0040]
Also by two shape retaining strut 13B ₁ and the shape retaining struts 13B _2, and supports the cylindrical member 12B which has a step shape. The circumferential shape of the cylindrical member 12 </ b> B is held by the cable 14. Then, the injection water 16 is injected into the inside of the cylindrical member 12B.
[0041]
When a drifting object or the like collides with the cylindrical member 12B, the cylindrical member 12B is bent and dented. For this reason, it is possible to alleviate the impact of drifting objects and the like. Further, when the cylindrical member 12B is bent and dented, the water surface 16b of the injection water 16 rises. At this time, since the tubular member 12B has a shape in which the cross-sectional area gradually decreases as it goes upward, the water surface 16b tends to rise particularly on the upper stage side. Since the water surface 16b is easily raised in this manner, the water pressure of the injection water 16 is also easily increased, and the once-recessed cylindrical member 12B is pushed back to the outer peripheral side by the increased water pressure of the injection water 16 to have a shape. Recovers into a cylindrical shape. As a result, the colliding drifting substances and the like are buffered while denting the cylindrical member 12B, and then pushed back from the cylindrical member 12B. Thus, the impact due to the collision of the drifting object or the like can be reduced, and the pier or the like can be protected.
[0042]
In the present embodiment, in the initial stage when the drifting material or the like collides with the cylindrical member 12B, the repulsive force from the cylindrical member 12B is small, but the water surface 16b tends to rise upward and the water pressure rapidly increases. As the water surface 16b moves upward, the repulsive force from the cylindrical member 12A sharply increases. For this reason, the impact can be buffered more effectively, and the drifting objects and the like can be reliably pushed back.
[0043]
In addition, a receiving plate made of a slippery material may be provided on a surface of the outer peripheral surface of the tubular member 12B where a drifting substance easily collides. In order to maintain the circumferential shape (ring shape) of the cylindrical member 12B, a ring-shaped pipe or the like may be used instead of the cable 14.
When the cylindrical member 12B is made rigid enough to hold its own shape (can hold a cylindrical shape), the shape holding columns 13B ₁ and 13B ₂ and the cable 14 may be omitted. As a method of giving the cylinder member 12B a self-shape holding function, the entire cylinder member 12B is made thicker, a part thereof (a part extending in the vertical direction) is made thicker, or the whole is formed of a highly rigid material. A method can be adopted.
Further, as the cylindrical member 12B, one having not only the bottom surface but also the upper surface closed can be adopted. Further, the cylindrical shape of the cylindrical member 12B may be not only a cylindrical shape but also a square cylindrical shape.
The water buffer structure 11B can be used as a fender, and can be attached to a ship or a floating body in an emergency.
[0044]
【The invention's effect】
As described above in detail with the embodiments, the water-absorbing structure of the present invention is formed in a bottomed cylindrical shape by a flexible membrane material that does not allow water to permeate, and Until the water level of the water is higher than the water level of the river, lake or marsh or the sea where the water is installed, a cylindrical member into which the injection water is injected is provided.
Therefore, when a drifting object or the like collides with the cylindrical member, the cylindrical member bends and dents, thereby absorbing an impact force. In addition, the water level of the injection water rises due to the depression of the cylindrical member and the injection water pressure increases, and the concave cylinder member is pushed back outward by the water pressure, the shape recovers to a cylindrical shape, and the colliding drifting substance is pushed back. Can be. For this reason, by arranging the water buffer structure of the present invention on the structure to be protected, it is possible to prevent the structure to be protected from being impacted by drifting objects or the like. In addition, the water buffer structure of the present invention can be easily installed at a required place.
[0045]
Further, in the water buffer structure of the present invention, a water-permeable flexible membrane material is formed in a cylindrical shape with a bottom, and the surface of the injected water to be injected into the inside is controlled by a river, a lake or a marsh, which is an installation location. Until the sea surface is higher than the surface of the sea, the cylindrical member into which the injection water is injected, and arranged along the height direction of the cylindrical member, and retains the shape in a state where the cylindrical member is extended in the vertical direction. A configuration is provided that includes a shape holding column and circumferential shape holding means that is arranged along a circumferential direction of the cylindrical member at a plurality of positions in the height direction of the cylindrical member and holds a circumferential shape of the cylindrical member.
Therefore, when a drifting object or the like collides with the cylindrical member, the cylindrical member bends and dents, thereby absorbing an impact force. In addition, the water level of the injection water rises due to the depression of the cylindrical member and the injection water pressure increases, and the concave cylinder member is pushed back outward by the water pressure, the shape recovers to a cylindrical shape, and the colliding drifting substance is pushed back. Can be. For this reason, by arranging the water buffer structure of the present invention on the structure to be protected, it is possible to prevent the structure to be protected from being impacted by drifting objects or the like. In addition, the water buffer structure of the present invention can be easily installed at a required place.
Further, since the cylindrical shape of the cylindrical member can be held by the shape holding column and the circumferential shape holding means, the cushioning can be reliably performed.
[0046]
Further, in the water buffer structure according to the present invention, the cylindrical member has a shape in which the cross-sectional area gradually decreases as it goes upward, or has a shape in which the cross-sectional area gradually decreases as it goes upward, The water level tends to rise as it goes upward, and the shape recovery force of the cylindrical member improves.
[0047]
Further, in the water-absorbing structure of the present invention, the height of the cylindrical member at the time of collision can be automatically adjusted by a configuration in which a buoyant body floating in the injection water is attached to the top of the cylindrical member. In addition, the cylindrical member has a configuration in which not only the bottom surface but also the upper surface is closed, and the shape recovery force is further enhanced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a water buffer structure according to a first embodiment of the present invention.
FIG. 2 is a perspective view showing a water buffer structure according to the first embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a water buffer structure according to a second embodiment of the present invention.
FIG. 4 is a cross-sectional view showing a water buffer structure according to a second embodiment of the present invention.
FIG. 5 is a sectional view showing a water buffer structure according to a third embodiment of the present invention.
FIG. 6 is a cross-sectional view showing a water buffer structure according to a third embodiment of the present invention.
FIG. 7 is a sectional view showing a water buffer structure according to a fourth embodiment of the present invention.
FIG. 8 is a sectional view showing a water buffer structure according to a fifth embodiment of the present invention.
[Explanation of symbols]
1, 1A, 11, 11A, 11B water buffer structure 2,12,12A, 12B cylinder member _{3,3A, 13,13A, 13B 1, 13B} 2 shape retention posts 4,14 cable 5,15 Water 6,16 injection Water 6b, 16b Water surface

Claims

It is formed into a cylindrical shape with a bottom by a flexible membrane material that does not allow water to permeate, and is injected until the level of the injected water that is injected inside is higher than the water level of the river, lake, marsh, or sea where it is installed. A water buffer structure comprising a cylindrical member into which water is injected.

It is formed into a cylindrical shape with a bottom by a flexible membrane material that does not allow water to permeate, and is injected until the level of the injected water that is injected inside is higher than the water level of the river, lake, or sea where it is installed. A cylindrical member into which water is injected,
A shape holding column that is arranged along the height direction of the cylindrical member and holds the shape in a state where the cylindrical member is extended in the up-down direction,
A water-absorbing structure, comprising: a plurality of circumferentially-shaped holding means that are arranged along a circumferential direction of the cylindrical member at a plurality of positions in a height direction of the cylindrical member and hold the circumferential shape of the cylindrical member. object.

In claim 1 or claim 2,
The water-cushioning structure according to claim 1, wherein the tubular member has a shape in which a cross-sectional area is gradually reduced as it goes upward.

In claim 1 or claim 2,
A water-absorbing structure, wherein the tubular member has a shape in which a cross-sectional area gradually decreases as it goes upward.

In any one of claims 1 to 4,
A water-absorbing structure, wherein a buoyant body that floats on the injection water is attached to a top of the cylindrical member.

The water buffer structure according to claim 1, wherein the cylindrical member is closed not only on the bottom surface but also on the upper surface.