JP3969813B2 - Pneumatic fender - Google Patents

Pneumatic fender Download PDF

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Publication number
JP3969813B2
JP3969813B2 JP32278897A JP32278897A JP3969813B2 JP 3969813 B2 JP3969813 B2 JP 3969813B2 JP 32278897 A JP32278897 A JP 32278897A JP 32278897 A JP32278897 A JP 32278897A JP 3969813 B2 JP3969813 B2 JP 3969813B2
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JP
Japan
Prior art keywords
fender
energy absorber
reaction force
main body
honeycomb structure
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
Application number
JP32278897A
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Japanese (ja)
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JPH11152728A (en
Inventor
明 谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yokohama Rubber Co Ltd
Original Assignee
Yokohama Rubber Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Yokohama Rubber Co Ltd filed Critical Yokohama Rubber Co Ltd
Priority to JP32278897A priority Critical patent/JP3969813B2/en
Publication of JPH11152728A publication Critical patent/JPH11152728A/en
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Publication of JP3969813B2 publication Critical patent/JP3969813B2/en
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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
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • Y02A30/30Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways

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Description

【0001】
【発明の属する技術分野】
この発明は、空気式防舷材に係わり、更に詳しくは円筒型空気式防舷材に設計許容以上の外力が作用した場合であっても、防舷材本体の破損を未然に防止することが出来るようにした空気式防舷材に関するものである。
【0002】
【従来の技術】
従来、岸壁等に船舶を接舷する際に、その衝撃力を緩和する目的で防舷材が使用され、この防舷材には、ソリッドタイプの防舷材と、繊維等で補強したゴム製袋体の内部に圧縮空気を充填し、空気の反力により反力を得るタイプの円筒型空気式防舷材とが知られている。
【0003】
この空気の圧縮反力を利用した円筒型の空気式防舷材は、図3及び図4に示すように、内層1と外層2との間に補強コード等の補強層3を埋設した中空円筒状の可撓性中空体4の前端部に、受衝板5を気密的に装着すると共に、後端部には岸壁Gへの取付け板6を気密的に装着し、可撓性中空体4の内部には圧縮空気が充填してある。
【0004】
この円筒型の空気式防舷材には、外的条件によっては設計許容以上の外力が数年または数十年に一度程度の割りで防舷材に作用する場合があり、通常では作用しないために、その設計許容以上の外力が発生した時のみの対応が考えられていなかった。
【0005】
【発明が解決しようとする課題】
円筒型の空気式防舷材は、上記のように設計許容以上の外力が防舷材に作用した場合、ソリッドタイプの防舷材に比較して、高圧縮歪み時の反力が少ないため、許容以上の圧縮歪みが発生し、この高歪みにより防舷材本体に部分的に無理な応力が発生する。
【0006】
また、高歪みにより防舷材本体の取付け部材に接触することにもなり、防舷材本体の外皮に傷が発生し、この傷が補強層に伝播して防舷材本体が破損事故を起こすと言う問題があった。なお、破損した防舷材本体は、ソリッドタイプの防舷材の破損品と異なり、補修を行わねば再使用は不可能となる。
この発明の目的は、防舷材本体に過度の歪みを発生させず、防舷材本体の破損を未然に防止することが出来る空気式防舷材を提供することにある。
【0007】
【課題を解決するための手段】
この発明は上記目的を達成するため、空気式防舷材において、可撓性中空体の後端側の内部または外部で、かつ許容外歪み領域のみに、変形材料から成るエネルギー吸収体を設け、該エネルギー吸収体を金属ハニカム構造体またはエラストマーハニカム構造体で構成したことを要旨とするものである。このように、可撓性中空体の後端側の内部または外部で、かつ許容外歪み領域のみに、変形材料から成るエネルギー吸収体を設け、該エネルギー吸収体を金属ハニカム構造体またはエラストマーハニカム構造体で構成したことにより、許容量以上の外力が加わった場合、許容値以外の外部エネルギーはエネルギー吸収体が受け持つことになり、防舷材本体に過度の歪みを発生させる事はなく、従って、防舷材本体の損傷による破損は未然に防止出来るものである。
【0008】
【発明の実施の形態】
以下、添付図面に基づき、この発明の実施形態を説明する。図1は、この発明を実施した空気の圧縮反力を利用した円筒型の空気式防舷材の縦断正面図を示し、この防舷材本体10は、内層ゴム11と外層ゴム12との間にコード等の補強層13を埋設した中空円筒状の可撓性中空体14の前端部に、受衝板15を気密的に装着すると共に、後端部には岸壁Gへの取付け板16を気密的に装着し、可撓性中空体14の内部には圧縮空気が充填してある。前記可撓性中空体14の後端側の内部(または外部)で、かつ許容外歪み領域Xのみに、変形材料から成るエネルギー吸収体17(以下、高エネルギー吸収体17という)が設置してある。
【0009】
記高エネルギー吸収体17としては、アルミニュウム等で形成した金属ハニカム構造体またはエラストマーハニカム構造体により所定の大きさに形成するものである。このように、可撓性中空体14の後端側の内部で、かつ許容外歪み領域Xのみに、変形材料から成る高エネルギー吸収体17を設けたことにより、許容量以上の外力が加わった場合、許容値以上の外部エネルギーは高エネルギー吸収体17が受け持つことになり、防舷材本体10に過度の歪みを発生させる事はなく、従って、防舷材本体10の損傷による破損は未然に防止出来るものである。
【0010】
次に、図2(a)〜(c)を参照しながら、防舷材本体10の反力曲線T1 ,高エネルギー吸収体17の反力曲線T2 ,この両者を組み合わせた反力曲線T1 +T2 について具体的に説明する。
図2(a)は、従来の防舷材本体10の反力曲線T1 を示し、外力(f)が大きくなる程、歪み(δ)も大きくなり、許容歪み領域Zを超える外力(f)が防舷材本体10に作用した場合には、過度の歪みが発生して防舷材本体10の外層ゴム2等が損傷し、防舷材本体10が破損することになる。
【0011】
また、図2(b)は、金属ハニカム構造体またはエラストマーハニカム構造体から成る高エネルギー吸収体17の反力曲線T2 及び吸収エネルギー曲線を示し、この高エネルギー吸収体17は、相当の大きな外力が作用しない限り、歪みは発生せず、ある歪み以上では高エネルギー吸収体は座屈を起こすこととなり、以降は歪みが発生し、反力曲線T2 としては矩形状態を示す。
【0012】
また、図2(c)は、防舷材本体10と高エネルギー吸収体17とを組み合わせた反力曲線T1 +T2 であって、通常の船舶の接舷や揺動等の接触では、防舷材本体10の吸収エネルギーで受持ち、許容以上の外力が防舷材本体10に加わった場合には、防舷材本体10の吸収エネルギーと高エネルギー吸収体17の吸収エネルギーとの総合吸収エネルギーで受持ち、反力曲線としては、図2(c)のT1 +T2 となる。
【0013】
この場合、高エネルギー吸収体17の方が、防舷材本体10より大きな反力曲線を持つことになるので、防舷材本体10の歪み量は小さくなり、過度の歪みを発生させず、破損を有効に防止出来るものである。
また、高エネルギー吸収体をソリッドゴムで製作した事例もあるが、ソリッドゴムは反力曲線は右上がりの曲線であることにより、過度の歪みを抑えることはできない。
【0014】
【発明の効果】
この発明は、上記のように可撓性中空体の後端側の内部または外部で、かつ許容外歪み領域のみに、変形材料から成る高エネルギー吸収体を設けたので、防舷材本体に許容量以上の外力が加わった場合、許容値以上の外部エネルギーは高エネルギー吸収体が受け持つことになり、防舷材本体に過度の歪みを発生させる事はなく、従って、防舷材本体の損傷による破損は未然に防止出来る効果がある。
【図面の簡単な説明】
【図1】この発明を実施した空気の圧縮反力を利用した円筒型の空気式防舷材の縦断正面図である。
【図2】(a)は、従来の防舷材本体の反力曲線T1 を示す説明図、(b)は、高エネルギー吸収体の反力曲線T2 を示す説明図、(c)は、防舷材本体と高エネルギー吸収体との両者を組み合わせた反力曲線T1 +T2 を示す説明図である。
【図3】従来の円筒型の空気式防舷材の取付け状態を示す斜視図である。
【図4】従来の円筒型の空気式防舷材の断面図である。
【符号の説明】
10 防舷材本体 11 内層ゴム
12 外層ゴム 13 補強層
14 可撓性中空体 15 前衝板
16 取付け板 17 高エネルギー吸収体
G 岸壁 X 許容外歪み領域
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pneumatic fender, and more specifically, it can prevent damage to the fender main body even when an external force exceeding the design allowance is applied to the cylindrical pneumatic fender. It relates to pneumatic fenders that can be made .
[0002]
[Prior art]
Conventionally, when a ship is attached to a quay or the like, a fender is used for the purpose of reducing the impact force. The fender is made of a solid type fender and rubber reinforced with fibers. There is known a cylindrical pneumatic fender of a type in which a bag body is filled with compressed air and a reaction force is obtained by the reaction force of air.
[0003]
As shown in FIGS. 3 and 4, the cylindrical pneumatic fender using the air compression reaction force is a hollow cylinder in which a reinforcing layer 3 such as a reinforcing cord is embedded between an inner layer 1 and an outer layer 2. The shock-receiving plate 5 is airtightly attached to the front end portion of the flexible hollow body 4 and the mounting plate 6 to the quay G is airtightly attached to the rear end portion. Is filled with compressed air.
[0004]
Depending on the external conditions, external force exceeding the design allowance may be applied to the cylindrical fenders once every few years or decades. In addition, no response has been considered only when an external force exceeding the design tolerance is generated.
[0005]
[Problems to be solved by the invention]
Cylindrical pneumatic fenders have less reaction force at the time of high compression strain compared to solid fenders when external force exceeding the design allowance is applied to the fenders as described above. An excessive compressive strain is generated, and this high strain causes an unreasonable stress in the fender body.
[0006]
In addition, due to high strain, the fender material main body may come in contact with the fender body, and the outer skin of the fender body may be damaged. This flaw propagates to the reinforcing layer and causes damage to the fender body. There was a problem. A damaged fender body is different from a damaged fender of a solid type fender and cannot be reused without repair.
An object of the present invention is to provide a pneumatic fender capable of preventing damage to the fender main body without causing excessive distortion to the fender main body.
[0007]
[Means for Solving the Problems]
Since this invention to achieve the above object, the pneumatic fender, inside or outside of the rear end side of the flexible hollow body, and only the unallowable strained region, from deformable material forming Rue energy absorber The gist of the invention is that the energy absorber is formed of a metal honeycomb structure or an elastomer honeycomb structure . Thus, inside or outside the rear end side of the flexible hollow body and unallowable only strained region, the formation Rue energy absorber provided from a deformable material, metal honeycomb structure or elastomers the energy absorber with the arrangements in the honeycomb structure, if applied not smaller than an allowable value of an external force, the external energy other than tolerance will be energy absorber takes charge, it generates excessive distortion fender body Therefore, breakage due to damage of the fender body can be prevented in advance.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a longitudinal front view of a cylindrical pneumatic fender utilizing an air compression reaction force embodying the present invention. The fender main body 10 is provided between an inner layer rubber 11 and an outer layer rubber 12. An impact plate 15 is airtightly attached to the front end of a hollow cylindrical flexible hollow body 14 in which a reinforcing layer 13 such as a cord is embedded, and a mounting plate 16 to the quay G is attached to the rear end. The flexible hollow body 14 is installed in an airtight manner and is filled with compressed air. The inside rear end of the flexible hollow body 14 (or external), and only the unallowable strained region X, installation consists deformable material Rue energy absorber 17 (hereinafter, referred to as high-energy absorber 17) It is.
[0009]
The pre-Symbol high energy absorber 17, and forms a predetermined size by a metal honeycomb structure or elastomeric honeycomb structure formed by aluminum or the like. As described above, by providing the high energy absorber 17 made of the deformable material only in the allowable outer strain region X in the rear end side of the flexible hollow body 14, an external force exceeding the allowable amount is applied. In this case, the external energy exceeding the allowable value will be handled by the high energy absorber 17 and will not cause excessive distortion in the fender body 10, so that the fender body 10 will not be damaged due to damage. It can be prevented.
[0010]
Next, with reference to FIG. 2 (a) ~ (c) , reaction force curve T 1 of the fender main body 10, reaction force curve T 2 of the high-energy absorber 17, reaction force curve T that combines these two 1 + T 2 will be specifically described.
FIG. 2A shows a reaction force curve T 1 of the conventional fender main body 10. As the external force (f) increases, the strain (δ) increases, and the external force (f) exceeding the allowable strain region Z. When this acts on the fender main body 10, excessive distortion occurs, the outer layer rubber 2 and the like of the fender main body 10 are damaged, and the fender main body 10 is broken.
[0011]
FIG. 2B shows a reaction force curve T 2 and an absorption energy curve of the high energy absorber 17 formed of a metal honeycomb structure or an elastomer honeycomb structure. The high energy absorber 17 has a considerable external force. As long as the above does not act, no strain is generated. Above a certain strain, the high energy absorber will buckle, and thereafter the strain is generated, and the reaction force curve T 2 shows a rectangular state.
[0012]
FIG. 2C shows a reaction force curve T 1 + T 2 in which the fender main body 10 and the high energy absorber 17 are combined. When the external energy exceeding the permissible force is applied to the fender body main body 10 with the absorbed energy of the fender body 10, the total absorbed energy of the fender material main body 10 and the high energy absorber 17 is absorbed. The handle and reaction force curve is T 1 + T 2 in FIG.
[0013]
In this case, since the high energy absorber 17 has a larger reaction force curve than the fender main body 10, the amount of distortion of the fender main body 10 is reduced, causing no excessive distortion and breakage. Can be effectively prevented.
There is also a case where the high energy absorber is made of solid rubber, but the solid rubber cannot suppress excessive distortion because the reaction force curve is a curve rising to the right.
[0014]
【The invention's effect】
In the present invention, as described above, the high energy absorber made of the deformable material is provided inside or outside the rear end side of the flexible hollow body and only in the allowable outside strain region. When an external force exceeding the capacity is applied, external energy exceeding the allowable value will be handled by the high energy absorber and will not cause excessive distortion in the fender body. Damage can be prevented in advance.
[Brief description of the drawings]
FIG. 1 is a longitudinal front view of a cylindrical pneumatic fender utilizing an air compression reaction force embodying the present invention.
2A is an explanatory view showing a reaction force curve T 1 of a conventional fender body, FIG. 2B is an explanatory view showing a reaction force curve T 2 of a high energy absorber, and FIG. is an explanatory diagram showing a reaction force curve T 1 + T 2 which combines both a fender body and a high energy absorber.
FIG. 3 is a perspective view showing a mounting state of a conventional cylindrical pneumatic fender.
FIG. 4 is a cross-sectional view of a conventional cylindrical pneumatic fender.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Body material 11 Inner layer rubber 12 Outer layer rubber 13 Reinforcement layer 14 Flexible hollow body 15 Front plate 16 Mounting plate 17 High energy absorber G Quay wall X Allowable external strain region

Claims (1)

補強層を埋設した中空円筒状の可撓性中空体の前端部に前衝板を気密的に装着すると共に、後端部に岸壁への取付け板を気密的に装着して成る空気式防舷材において、前記可撓性中空体の後端側の内部または外部で、かつ許容外歪み領域のみに、変形材料から成るエネルギー吸収体を設け、該エネルギー吸収体を金属ハニカム構造体またはエラストマーハニカム構造体で構成した空気式防舷材。A pneumatic fender constructed by airtightly attaching a front impact plate to the front end portion of a hollow cylindrical flexible hollow body in which a reinforcing layer is embedded, and airtightly attaching a mounting plate to a quay at the rear end portion. in wood, inside or outside the rear end of the flexible hollow body, and unallowable only strained region, the formation Rue energy absorber provided from a deformable material, metal honeycomb structure or elastomers the energy absorber A pneumatic fender made of a honeycomb structure .
JP32278897A 1997-11-25 1997-11-25 Pneumatic fender Expired - Fee Related JP3969813B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP32278897A JP3969813B2 (en) 1997-11-25 1997-11-25 Pneumatic fender

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP32278897A JP3969813B2 (en) 1997-11-25 1997-11-25 Pneumatic fender

Publications (2)

Publication Number Publication Date
JPH11152728A JPH11152728A (en) 1999-06-08
JP3969813B2 true JP3969813B2 (en) 2007-09-05

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Country Status (1)

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6179186B2 (en) * 2013-05-16 2017-08-16 横浜ゴム株式会社 Pneumatic fender
JP5880384B2 (en) * 2012-10-11 2016-03-09 横浜ゴム株式会社 Pneumatic fender
WO2014058044A1 (en) 2012-10-11 2014-04-17 横浜ゴム株式会社 Pneumatic fender

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