看到日本川崎船廠關于VLCC結構的一篇文章，上傳給各位參考

menglianglum · 发表于 2009-7-13 13:19

今日上網看到日本川崎船廠關于VLCC結構的一篇文章，上傳給各位參考。
若有參考價值，將感欣慰。

http://www.kawasakizosen.co.jp/english/03_resu_09_02_03.html

Optimum Hull Structure

Simplified hull structure and enhanced structural strength

Apple Slot

Comparison between Conventional Structure and New Structure with Apple Slot

Conventional double hull structure and new double hull structure with Apple Slot are compared in VLCC's (Very Large Crude Carrier) case below:

Web plates of main transverse members such as floor plate need to be fitted with stiffeners (a kind of reinforcement member) with required spacing to prevent the buckling of the structure. In VLCC's conventional double bottom floor structure, vertical stiffeners are directly fixed to every longitudinal frame by welding. In the Apple Slot structure, on the other hand, a combined stiffening arrangement of vertical stiffeners with necessary spacing (to ensure the rigidity of the entire floor structure) and horizontal stiffeners (to divide the floor plate between these vertical stiffeners) is adopted to prevent the buckling of the floor plate.

In this structure, because the vertical stiffener is omitted, the load transmitted from the longitudinal frame to the web plate of the main transverse member is increased, but by making the slot opening have a special shape with oval (Apple Slot), the stress concentration there is relieved.


Conventional Slot	Apple Slot
* High stress parts are indicated in yellow.

In spite of omitting the vertical stiffener, the Apple Slot structure shows lower stress levels around the slot.

The Apple Slot structure ensures a higher structural reliability because it enables reduction of welding works at connecting parts between face plate of longitudinal frame and vertical stiffeners on the floor where the stresses are so high as to cause fatigue damage.

Further, because of reducing the number of vertical stiffeners and brackets connected to the longitudinal frame, the Apple Slot structure is advantageous in simplifying the structure and automating the construction process.

blackmclaren · 发表于 2009-7-13 13:54

苹果型节点，船越大节点做得越细，一点一滴都要抠出来。

pigdancer · 发表于 2009-7-13 14:50

十分感谢，分享，

rainbow888 · 发表于 2009-7-13 15:19

细节决定一切，这点要向小日本学习!

woshimol99 · 发表于 2009-7-13 15:25

受教了，目前对结构入门！

冰河 · 发表于 2009-7-13 16:05

认真学习下,谢谢分享

8905746 · 发表于 2009-7-13 16:08

头一次看到这样的节点。长见识了。

SWC · 发表于 2009-7-13 18:00

小日本这种精神确实应该学习。
但这T型材过实肋板的两种切口（贯穿孔）形式，国内很少见，也许我孤陋寡闻。
国内船T型材过实肋板或围壁，采用门字型（∩）切口，再加上水密或非水密补板。这种形式的好处是现场安装工艺性好，外板上胎架----装T型材（纵向构件）----吊装实肋板------。
但是上面日本的两种切口，无论是Conventional Slot 还是Apple Slot，我觉得现场安装都很困难，实肋板怎么装？难道从T型材端口拉进去吗？
不明白，请各位解惑

mechcat · 发表于 2009-7-13 21:38

两类的贯穿孔各有特点：
有挺筋的，对于double skin，挺筋可折减纵骨跨距，另外，挺筋的设置可增大纵骨与强框的连接面积，但挺筋与纵骨面板连接处存在疲劳问题，而且S-N曲线至多取到F曲线；
无挺筋的，疲劳问题转移到贯穿孔本身，即需作苹果型（软趾），S-N曲线可取到E曲线（主甲板处除外），但纵骨跨距不能折减，而且连接面积需要进一步校核，强框的板格屈曲可能存在问题；
一家之言，见仁见智。

林风一曲 · 发表于 2009-10-20 21:04

其实不只在VLCC上是用这种孔，日本一般的船型都已经广泛采用这种方式，而且还一种孔，相对大一点，需要加一块补板。

houxianguo · 发表于 2009-10-20 21:11

八楼的朋友，你说的对，我们厂建造的32万吨油船和38.8万的矿砂船就是采用的苹果型节点

daiyujin · 发表于 2009-10-20 21:31

11# houxianguo

请问，这个怎么安装啊

余海存 · 发表于 2009-10-21 08:59

是呀肋板怎么安装难道是先装肋板在吧t排穿过去安装不成太浪工了吧加大施工难度不解

xuehu122 · 发表于 2010-2-2 10:34

细节工艺都要像日韩多学习

nizw · 发表于 2010-2-4 09:11

这好像我看到过，不过不是这样的贯穿孔，是先装实肋板，让后T排拉进去的

cain1212 · 发表于 2010-2-4 17:38

学习中，不学习不行啊

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