JP2004090748A - Vibration-in-water preventing structure for cargo tank in vessel - Google Patents

Vibration-in-water preventing structure for cargo tank in vessel Download PDF

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Publication number
JP2004090748A
JP2004090748A JP2002253361A JP2002253361A JP2004090748A JP 2004090748 A JP2004090748 A JP 2004090748A JP 2002253361 A JP2002253361 A JP 2002253361A JP 2002253361 A JP2002253361 A JP 2002253361A JP 2004090748 A JP2004090748 A JP 2004090748A
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Japan
Prior art keywords
girder
liquid
cargo tank
vibration
web plate
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JP2002253361A
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JP3975138B2 (en
Inventor
Hiroshi Negayama
根ヶ山　博
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Sumitomo Heavy Industries Ltd
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Sumitomo Heavy Industries Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration-in-water preventing structure for a cargo tank in a vessel which can prevent the vibration-in-water of a beam to be sunk in the liquid without or restricting an increase in weight of the beam to be sunk in the liquid an increase thereof. <P>SOLUTION: The beam of the cargo tank of a vessel to be sunk in the liquid is provided with a plurality of holes passing through from a surface to a back surface. Strength of the beam to be sunk in the liquid is reinforced in response to the plurality of holes. An area-in-water of the beam to be sunk in the liquid is reduced by a total area of the plurality of holes to raise the natural frequency of the beam to be sunk in the liquid to a degree higher than a zone of the natural frequency of a vibration source inside the vessel. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、タンカー等液体貨物運搬船におけるカーゴタンクの、液体に浸かる桁の接水振動を防止する構造に係わる。
【０００２】
【従来の技術】
液体貨物運搬船におけるカーゴタンク内構造で、共振が発生した場合、カーゴタンクに亀裂が生じることがあり、亀裂が生じるとカーゴタンクから液体貨物がリークすると云う重大事故を引き起こす危険性がある。
このため、対象構造部材を補強するなどして、共振を防止する対策がとられている。
【０００３】
図８にカーゴタンクの断面構造を示している。１は船体、２は船体外板、３は船体内板、４は甲板、５は船底外板、６はタンクの縦通隔壁である。
７は各カーゴタンク内に、船体１の縦方向に幾重かに形成されたトランスリングであり、７−１はトランスリングの垂直桁、７−２はトランスリングの水平桁である。例えば、このトランスリングの垂直桁７−１が接水振動防止の対象構造部材となる。
【０００４】
図９に示すように、垂直桁７−１は、縦通隔壁６に直角に固定されるウエブ板８と、該ウエブ板８の端部に固定されるフランジ部材９と、ウエブ板８の倒れ防止用に、ウエブ板８の面と縦通隔壁６の側との間に水平に配置されるブラケット１０およびウエブ板８の縦方向の補強ブラケット１１とより構成されている。
【０００５】
１２は縦通隔壁６の補剛材であるロンジ材であって、ウエブ板８を貫通して、船体１の縦方向に設けられている。
前記水平に配置されるブラケット１０は、ロンジ材１２に接続されるか、あるいは、縦通隔壁６に直接接続されることがある。
【０００６】
一般に、液体に浸かる部材は空気中の部材に比べて、当該部材の固有振動数は低下する。これは、部材が振動する時にはその回りの空気または液体を伴って振動するが、このとき、空気と比べて液体の比重の方が大きいためである。
船体を設計するときには、推進装置などが起振源として存在することから、その低次の振動数との共振現象を避けるように考慮される。
その結果、共振を避けるべき対象構造部材の状態は、固有振動数が低下する液体に接する状態となる場合が多い。
【０００７】
従来、共振の可能性があり、その対策が必要な場合には、液体との接触により固有振動数が低下する垂直桁７−１の固有振動数を上昇させている。そして、その手段としてロンジ材１２およびブラケット１０、１１などの寸法を大きくすることが行われており、結果として構造部材の重量増加を来している。
また、船体が同じ大きさの船舶であっても、主機関の気筒数やプロペラの翼数の仕様変更に伴って、これら部材の寸法も大幅に変更されることになる。
【０００８】
【発明が解決しようとする課題】
本発明は、液体に浸かる桁の重量を増加させることなく、あるいは増加を抑え、該液体に浸かる桁の接水振動を防止することができる船舶におけるカーゴタンクの接水振動防止構造を得ることを目的とする。
【０００９】
【課題を解決するための手段】
船舶におけるカーゴタンクの接水振動防止構造であって、カーゴタンクの液体に浸かる桁に、表裏貫通する複数個の穴を設けると共に、該複数個の穴に対応して該液体に浸かる桁の強度を補強し、該液体に浸かる桁の接水面積を低減して、該液体に浸かる桁の固有振動数を、船体内の起振源の固有振動数のゾーンより上位まで上昇させるようにした。
【００１０】
【発明の実施の形態】
以下、図に沿って本発明の実施の形態について説明する。図１は本発明による桁構造の概略を示す図、図２は図１の部分拡大図、図３は図２のＡ−Ａ矢視による断面図、図４は図２のＢ−Ｂ矢視による断面図、図５は図２の構造の変形例を示す図、図６は本発明の他の構造例を示す図、図７は図６の構造の変形例を示す図である。なお、図８、図９において説明した部分と同一の部分については同じ符号を付し、詳細な説明は省略する。
【００１１】
図１，図２において、１３は垂直桁７−１のウエブ板８に設けられた表裏貫通する穴であって、垂直桁７−１のスパンの端部に設けられている。
該穴１３を設けることによって、垂直桁７−１は液体との接水面積を低減され、その固有振動数は高められる。
したがって、この垂直桁７−１の固有振動数を、船体１内の起振源の固有振動数のゾーンより上位まで上昇させるだけの面積の穴１３を設ければ、垂直桁７−１の起振源との共振を防止することができる。
【００１２】
ところで、トランスリング７はカーゴタンクの構造部材であるから、穴１３を設けることによって、垂直桁７−１の強度が低下することは防がねばならず、穴１３の回りを補強し、垂直桁７−１の強度を保持する必要がある。
このため、共振を防止するに必要な面積を得るのに、一つの大きな穴を設けることは強度的に不利である。そこで、複数個の穴１３を設け、トータルで必要な開口面積を確保するようにし、補強材を小さくしている。
【００１３】
図１，図２においては、垂直桁７−１のスパン方向に斜めにクロスする十字形の補強リブ１４−１、１４−２を設け、該補強リブ１４−１、１４−２の間に略三角状の４つの穴１３を設けている。
図５の例では、垂直桁７−１のスパン方向に斜めに配置した補強リブ１４−１を設け、該補強リブ１４−１の上下に、略三角状の２つの穴１３を設けている。
なお、１４−３は垂直桁７−１のスパン方向に直角に取り付けられた補強リブである。
【００１４】
図６において、１５は垂直桁７−１のウエブ板８上、フランジ部材９に近づけて設けられた表裏貫通する穴である。この例の場合も、図６の（Ａ）、（Ｂ）に示すように、穴１５は複数個設けられており、トータルで共振を防止するに必要な開口面積になっている。
そして、この場合は穴１５の側方において、部分的にフランジ部材９の寸法を大きくして、垂直桁７−１の補強に対応している。
【００１５】
図７において、１５は垂直桁７−１のウエブ板８の幅方向中央部に設けられた表裏貫通する穴であって、上記と同様にトータルで、共振を防止するに必要な開口面積になっている。
この場合も穴１５の側方において、部分的にフランジ部材９の寸法を大きくして、あるいはウエブ板８の縦方向の補強フランジ１１の寸法を大きくして垂直桁７−１の補強に対応している。
【００１６】
なお、穴１５をフランジ部材９に近づけて設ける場合（図６の例）は、同程度の振動数に上昇させるのに、穴１５をフランジ部材９から離して設ける場合（図７の例）と比べて、穴のトータルの開口面積は相対的に小さくなる。
従って、図６の例の場合は、図７の例の場合と比較して穴１５の個数は少な目に設けることができる。
【００１７】
このように、本発明は液体に浸かる垂直桁７−１に、表裏貫通する穴１３，１５を設け、垂直桁７−１の液体との接水面積を低減するようにした。
そして、このように接水面積を低減することによって、垂直桁７−１の固有振動数を上昇させ、主機関などの起振源の固有振動数のゾーンより上位に固有振動数を設定するようにする。
【００１８】
なお、起振源の固有振動数のゾーンとは、例えば、主機関の始動時、定格回転時、停止時の固有振動数の幅のことである。
また、同程度の大きさの船体で、主機関の気筒数やプロペラ翼数の仕様変更とは、同程度の大きさの船体で、機能アップしたような場合であって、これに対しては穴１３，１５の位置、あるいは大きさを変更することで対応できる。
【００１９】
さらに、本発明では、補強ブラケット１４を設けるか、あるいは部分的にフランジ部材９、１１の寸法を大きくして補強するが、穴１３、１５を設けるので、垂直桁７−１の重量は殆ど増加しない。これは、単にロンジ材１２やブラケット１０の寸法を大きくし、構造材の剛性を増して、共振を防止していた従来の対応策と比較すると、構造材の重量増加は少なく、その重量差は極めて大きな差となる。
【００２０】
【発明の効果】
本発明は、液体に浸かる桁に、表裏貫通する複数個の穴を設け、該液体に浸かる桁の接水面積を低減して、該液体に浸かる桁の固有振動数を上昇させるようにしたので、当該桁構造部材の重量の増加を来すことなく、起振源との共振を防止することができるようになった。
【００２１】
また、複数個の穴のトータル面積で、共振を防止するに必要な開口面積を得るようにしたので、強度的に有利であり、補強部材を軽量化できた。さらに、同程度の大きさの船体において、主機関の気筒数や、プロペラ翼数の仕様変更に対しても、液体に浸かる桁に設ける穴の位置や、大きさを変更することで、当該桁構造部材の重量の増加を来すことなく対応できる。
【図面の簡単な説明】
【図１】本発明による桁構造の概略を示す図。
【図２】図１の部分拡大図。
【図３】図２のＡ−Ａ矢視による断面図。
【図４】図２のＢ−Ｂ矢視による断面図。
【図５】図２の構造の変形例を示す図。
【図６】本発明の他の構造例を示す図。
【図７】図６の構造の変形例を示す図。
【図８】カーゴタンクの概略断面図。
【図９】図８の部分拡大図。
【符号の説明】
１　船体　　　　　　　　　　　　　２　船体外板
３　船体内板　　　　　　　　　　　４　甲板
５　船底外板　　　　　　　　　　　６　縦通隔壁
７　トランスリング　　　　　　　　８　ウエブ板
９　フランジ部材　　　　　　　　１０　ブラケット
１１　縦方向ブラケット　　　　　　１２　ロンジ材
１３　穴　　　　　　　　　　　　　１４　補強ブラケット
１５　穴[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a structure of a cargo tank in a liquid cargo carrier such as a tanker, which prevents vibration of a girder immersed in liquid.
[0002]
[Prior art]
When resonance occurs in the cargo tank internal structure of the liquid cargo carrier, the cargo tank may be cracked, and the crack may cause a serious accident such as leakage of the liquid cargo from the cargo tank.
For this reason, measures have been taken to prevent resonance, such as by reinforcing the target structural member.
[0003]
FIG. 8 shows a sectional structure of the cargo tank. 1 is a hull, 2 is a hull shell, 3 is a hull shell, 4 is a deck, 5 is a bottom shell, and 6 is a vertical partition of a tank.
Reference numeral 7 denotes a trans ring formed in each cargo tank in the longitudinal direction of the hull 1 in multiple layers, 7-1 denotes a vertical girder of the trans ring, and 7-2 denotes a horizontal girder of the trans ring. For example, the vertical girder 7-1 of the transformer ring is a target structural member for preventing wet vibration.
[0004]
As shown in FIG. 9, the vertical beam 7-1 includes a web plate 8 fixed at a right angle to the longitudinal partition 6, a flange member 9 fixed to an end of the web plate 8, and a fall of the web plate 8. For prevention, it is composed of a bracket 10 horizontally disposed between the surface of the web plate 8 and the side of the vertical partition 6 and a reinforcing bracket 11 in the vertical direction of the web plate 8.
[0005]
Reference numeral 12 denotes a longitudinal member which is a stiffening member of the longitudinal partition 6 and is provided in the longitudinal direction of the hull 1 through the web plate 8.
The horizontally arranged bracket 10 may be connected to the longitudinal member 12 or directly to the longitudinal partition wall 6.
[0006]
Generally, a member immersed in liquid has a lower natural frequency than a member in air. This is because when the member vibrates, it vibrates with the surrounding air or liquid, and at this time, the specific gravity of the liquid is larger than that of air.
When designing a hull, since a propulsion device or the like is present as a vibration source, consideration is given to avoid resonance with lower frequencies.
As a result, in many cases, the state of the target structural member in which resonance should be avoided is a state in which the target structural member comes into contact with a liquid whose natural frequency decreases.
[0007]
Conventionally, when there is a possibility of resonance and countermeasures are required, the natural frequency of the vertical girder 7-1 whose natural frequency decreases due to contact with liquid is increased. Then, as a means for increasing the size of the long material 12 and the brackets 10, 11, etc., the weight of the structural member is increased as a result.
Further, even if the hulls are the same size, the dimensions of these members will also be significantly changed with changes in the specifications of the number of cylinders of the main engine and the number of blades of the propeller.
[0008]
[Problems to be solved by the invention]
An object of the present invention is to provide a structure for preventing water contact vibration of a cargo tank in a ship that can prevent water contact vibration of the girder immersed in the liquid without increasing or suppressing the weight of the girder immersed in the liquid. Aim.
[0009]
[Means for Solving the Problems]
A structure for preventing vibration of a cargo tank in a ship, which is provided with a plurality of holes penetrating the front and back sides of the girder immersed in the liquid of the cargo tank, and the strength of the girder immersed in the liquid corresponding to the plurality of holes. , The water contact area of the girder immersed in the liquid is reduced, and the natural frequency of the girder immersed in the liquid is raised to a level higher than the zone of the natural frequency of the vibration source in the hull.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a view schematically showing a girder structure according to the present invention, FIG. 2 is a partially enlarged view of FIG. 1, FIG. 3 is a sectional view taken along the line AA of FIG. 2, and FIG. 5, FIG. 5 is a diagram showing a modification of the structure of FIG. 2, FIG. 6 is a diagram showing another structure of the present invention, and FIG. 7 is a diagram showing a modification of the structure of FIG. 8 and 9 are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0011]
1 and 2, reference numeral 13 denotes a hole which penetrates the front and back of the web plate 8 of the vertical girder 7-1 and is provided at an end of the span of the vertical girder 7-1.
By providing the holes 13, the vertical girder 7-1 has a reduced water contact area with the liquid, and its natural frequency is increased.
Therefore, if a hole 13 having an area large enough to raise the natural frequency of the vertical girder 7-1 above the zone of the natural frequency of the vibration source in the hull 1 is provided, the starting of the vertical girder 7-1 is performed. Resonance with the vibration source can be prevented.
[0012]
By the way, since the transformer ring 7 is a structural member of the cargo tank, it is necessary to prevent the strength of the vertical girder 7-1 from being reduced by providing the holes 13, and to reinforce the periphery of the holes 13 to make the vertical girder. It is necessary to maintain the strength of 7-1.
Therefore, it is disadvantageous in terms of strength to provide one large hole in order to obtain an area necessary for preventing resonance. Therefore, a plurality of holes 13 are provided to secure a necessary opening area in total, and the reinforcing material is reduced.
[0013]
1 and 2, cross-shaped reinforcing ribs 14-1 and 14-2 that cross diagonally in the span direction of the vertical girder 7-1 are provided, and substantially between the reinforcing ribs 14-1 and 14-2. Four triangular holes 13 are provided.
In the example of FIG. 5, a reinforcing rib 14-1 is provided obliquely in the span direction of the vertical beam 7-1, and two substantially triangular holes 13 are provided above and below the reinforcing rib 14-1.
Reference numeral 14-3 denotes a reinforcing rib attached at a right angle to the span direction of the vertical girder 7-1.
[0014]
In FIG. 6, reference numeral 15 denotes a hole that penetrates the front and back sides provided on the web plate 8 of the vertical girder 7-1 near the flange member 9. Also in this example, as shown in FIGS. 6A and 6B, a plurality of holes 15 are provided, and the total opening area is necessary to prevent resonance.
In this case, the dimension of the flange member 9 is partially increased on the side of the hole 15 to cope with the reinforcement of the vertical girder 7-1.
[0015]
In FIG. 7, reference numeral 15 denotes a hole which penetrates the front and back sides provided at the center in the width direction of the web plate 8 of the vertical girder 7-1, and has a total opening area necessary for preventing resonance in the same manner as described above. ing.
Also in this case, the dimension of the flange member 9 is partially increased on the side of the hole 15 or the dimension of the longitudinal reinforcing flange 11 of the web plate 8 is increased to cope with the reinforcement of the vertical girder 7-1. ing.
[0016]
In addition, when the hole 15 is provided close to the flange member 9 (the example in FIG. 6), the hole 15 is provided away from the flange member 9 (the example in FIG. 7) to increase the frequency to the same level. In comparison, the total opening area of the hole is relatively small.
Therefore, in the case of the example of FIG. 6, the number of holes 15 can be smaller than in the case of the example of FIG.
[0017]
As described above, in the present invention, the vertical girder 7-1 immersed in the liquid is provided with the holes 13 and 15 penetrating from the front to the back to reduce the area of the vertical girder 7-1 that comes into contact with the liquid.
By reducing the water contact area in this way, the natural frequency of the vertical beam 7-1 is increased, and the natural frequency is set higher than the zone of the natural frequency of the vibration source such as the main engine. To
[0018]
The zone of the natural frequency of the vibration source is, for example, the width of the natural frequency at the time of starting, rated rotation, and stopping of the main engine.
Also, a change in the specifications of the number of cylinders and the number of propeller blades of the main engine in a hull of the same size is a case where the hull of the same size is improved and the function is improved. This can be dealt with by changing the positions or sizes of the holes 13 and 15.
[0019]
Further, in the present invention, the reinforcing bracket 14 is provided or the dimensions of the flange members 9 and 11 are partially increased to reinforce. However, since the holes 13 and 15 are provided, the weight of the vertical girder 7-1 is almost increased. do not do. This is because the weight increase of the structural material is small and the weight difference is small compared to the conventional countermeasure that simply increases the dimensions of the longitude material 12 and the bracket 10 and increases the rigidity of the structural material to prevent resonance. This is a very large difference.
[0020]
【The invention's effect】
According to the present invention, a plurality of holes penetrating the front and back of the girder immersed in the liquid are provided to reduce the water contact area of the girder immersed in the liquid, thereby increasing the natural frequency of the girder immersed in the liquid. Thus, resonance with the vibration source can be prevented without increasing the weight of the girder structural member.
[0021]
Further, since the opening area necessary for preventing resonance is obtained with the total area of the plurality of holes, the strength is advantageous and the weight of the reinforcing member can be reduced. Furthermore, in the case of a hull of the same size, the position and size of the holes provided in the girder immersed in liquid can be changed by changing the position and size of the girder soaked in the liquid even when the specifications of the number of cylinders of the main engine and the number of propeller blades are changed. It is possible to cope without increasing the weight of the structural member.
[Brief description of the drawings]
FIG. 1 is a view schematically showing a girder structure according to the present invention.
FIG. 2 is a partially enlarged view of FIG.
FIG. 3 is a sectional view taken along the line AA of FIG. 2;
FIG. 4 is a sectional view taken along the line BB in FIG. 2;
FIG. 5 is a diagram showing a modification of the structure of FIG. 2;
FIG. 6 is a diagram showing another structural example of the present invention.
FIG. 7 is a view showing a modification of the structure of FIG. 6;
FIG. 8 is a schematic sectional view of a cargo tank.
FIG. 9 is a partially enlarged view of FIG. 8;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hull 2 Hull shell 3 Hull board 4 Deck 5 Ship bottom shell 6 Vertical partition 7 Trans ring 8 Web board 9 Flange member 10 Bracket 11 Vertical bracket 12 Longitudinal material 13 Hole 14 Reinforcement bracket 15 Hole

Claims (6)

カーゴタンクの液体に浸かる桁に、表裏貫通する複数個の穴を設けると共に、該複数個の穴に対応して該液体に浸かる桁の強度を補強し、該液体に浸かる桁の接水面積を低減して、該液体に浸かる桁の固有振動数を、船体内の起振源の固有振動数のゾーンより上位まで上昇させるようにしたことを特徴とする船舶におけるカーゴタンクの接水振動防止構造。In the girder immersed in the liquid of the cargo tank, a plurality of holes penetrating the front and back are provided, and the strength of the girder immersed in the liquid is reinforced corresponding to the plurality of holes, and the water contact area of the girder immersed in the liquid is increased. A structure for preventing water contact vibration of a cargo tank in a ship, wherein the natural frequency of a girder immersed in the liquid is reduced to be higher than a zone of a natural frequency of a vibration source in a hull. . トランスリングの垂直桁のウエブ板に、該ウエブ板を貫通する複数個の穴を設けたことを特徴とする請求項１記載の船舶におけるカーゴタンクの接水振動防止構造。2. A structure for preventing vibration of a cargo tank in a ship according to claim 1, wherein a plurality of holes penetrating through the web plate are provided in a web plate of a vertical girder of the transformer ring. トランスリングの垂直桁のウエブ板に設けた複数個の穴の近辺に、垂直桁のスパン方向に対して斜めに配置される補強ブラケットを設けて、ウエブ板の強度を補強するようにしたことを特徴とする請求項２記載の船舶におけるカーゴタンクの接水振動防止構造。Around the plurality of holes provided in the web plate of the vertical girder of the transformer ring, reinforcing brackets that are arranged at an angle to the span direction of the vertical girder are provided to reinforce the strength of the web plate. 3. The structure for preventing vibration of a cargo tank in contact with water in a ship according to claim 2. 垂直桁のスパン方向に対して斜めに配置される補強ブラケットを、斜め十字形に設け、該斜め十字形に設けた補強ブラケット間に略三角状の穴を４個設けたことを特徴とする請求項３記載の船舶におけるカーゴタンクの接水振動防止構造。A reinforcing bracket arranged obliquely with respect to the span direction of the vertical girder is provided in an oblique cross shape, and four substantially triangular holes are provided between the reinforcing brackets provided in the oblique cross shape. Item 4. A structure for preventing a cargo tank from coming into contact with water in a ship according to Item 3. 穴を設ける位置の側方において、部分的にウエブ板のフランジ部材の寸法を大きくして、ウエブ板の強度を補強するようにしたことを特徴とする請求項２記載の船舶におけるカーゴタンクの接水振動防止構造。3. The connection of a cargo tank in a ship according to claim 2, wherein the dimension of the flange member of the web plate is partially increased on the side of the position where the hole is provided to reinforce the strength of the web plate. Water vibration prevention structure. 穴を設ける位置の側方において、部分的にウエブ板の縦方向フランジ部材の寸法を大きくして、ウエブ板の強度を補強するようにしたことを特徴とする請求項２記載の船舶におけるカーゴタンクの接水振動防止構造。3. The cargo tank according to claim 2, wherein the dimension of the longitudinal flange member of the web plate is partially increased on the side of the position where the hole is provided to reinforce the strength of the web plate. Anti-vibration structure.
JP2002253361A 2002-08-30 2002-08-30 Structure for preventing water contact vibration of cargo tanks in ships Expired - Fee Related JP3975138B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113501076A (en) * 2021-06-28 2021-10-15 沪东中华造船(集团)有限公司 Bracket wall and strong beam elbow-free transition structure
CN114987679A (en) * 2022-07-08 2022-09-02 上海外高桥造船有限公司 Ship, ship side frame and method for manufacturing ship side frame

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113501076A (en) * 2021-06-28 2021-10-15 沪东中华造船(集团)有限公司 Bracket wall and strong beam elbow-free transition structure
CN114987679A (en) * 2022-07-08 2022-09-02 上海外高桥造船有限公司 Ship, ship side frame and method for manufacturing ship side frame
CN114987679B (en) * 2022-07-08 2023-10-27 上海外高桥造船有限公司 Ship, ship side strong frame, and ship side strong frame manufacturing method

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