船体结构-4-船底结构.pdf

© 2011 DLOU Ocean EngineeringHull Structure— bottom contructionLecturer：Weiying ZhangMobile:13604261158Email: zwy@Wechat:Whyin:3057720072016 .3Dalian Ocean University © 2011 DLOU Ocean Engineeringquizƒ Answer the following questions in Chineseƒ 1. What is flat keel and sheer strake?ƒ 2. Do you know the name of the strakes in different sites and codes?ƒ 3. How are the arrangement of the shell plating and distribution of the thickness?ƒ 4. What kind of loads acting on the ship hull?ƒ Note: you have 5-8min to answer the questions.2Dalian Ocean University © 2011 DLOU Ocean Engineering3Focusing on the follows:ƒ Contents：ƒ 能简单叙述船底结构类型、船底结构受力情况ƒ 能正确描述各种底部结构形式的构件组成、结构形式、各构件的名称、所用型材、布置及相互连接方式；ƒ 能正确描述油船、散货船、集装箱船底部结构特点；ƒ Ability Objectives:ƒ 确定各种底部结构构件的组成、构件的名称、型式及作用ƒ 确定纵骨穿过水密或非水密肋板所采用的连接形式ƒ 根据给定船底结构图判断船底结构形式、船型并能够指出结构组成、构件名称、所用型号材类型及相互连接方式Dalian Ocean University © 2011 DLOU Ocean EngineeringBottom structure-contents1. Single-bottom structures2. Double-bottom structures4Bottom characteristics of Bulk carriers、oil container shipsTransverse framingLongitudinal framingDalian Ocean University © 2011 DLOU Ocean EngineeringIntroductionBottom construction5Single bottomDouble bottomFeatures:¾Better transverse strength¾Structure simplicity¾Easier to build¾More-usage of capacities¾Heavy of Lighting weight¾L700mm3 Transversely framing double bottomsDalian Ocean University © 2011 DLOU Ocean Engineering45Bottom girders(中底桁材和旁底桁材)Bottom Center Girder（中底纵桁）It is a longitudinal continuous member which breaks only at the bow and stern（纵向连续构件）.The girder is watertight in length of 0.75L to reduce the liquid free-surface effect(为减小双层底舱自由液面的影响，一般中桁材在船中0.75L都做成水密)3 Transversely framing double bottomsDalian Ocean University © 2011 DLOU Ocean Engineering46Bottom girders(中底桁材和旁底桁材)Bottom Center Girder（中底纵桁）¾Forces： longitudianl bending stress(承受总纵弯曲、坞墩支反力)¾ Profiles： flat steel, to extent to the fore and aft and equal to the height of double bottom(并尽量伸向首尾柱，高度等于双层底高度)。

3.2 Transversely framing double bottomsDalian Ocean University © 2011 DLOU Ocean Engineering47Bottom SideGirders（旁底桁材）location： longitudinal members located at the both side of the center girder(在中底桁的两侧对称布置的纵向构件，船宽大于9m时设置)Disconnect at the floor(一般由间断于肋板之间的钢板)3 Transversely framing double bottomsDalian Ocean University © 2011 DLOU Ocean Engineering48Bottom SideGirders（旁底桁材）There different size manholes and lightening holes on it(为便于工作人员 通 过 和减 轻结 构的重量，在旁桁材上 开 有人孔或减 轻 孔 )There weld notch at the four corner(四角开 有 焊缝 切口 )1-buld head；2- inner bottom；3- side girder；4-bottom plating5- solid floor6- watertight floor人孔尺寸不小于320mm 横 舱 内底旁桁船底实 肋水密肋3 Tansverse framing double bottomsDalian Ocean University © 2011 DLOU Ocean Engineering49Floors(肋板)：Transver member at each frame(装 设 在船底每 一肋骨位置上的 横向构件 )作用： 对 保正船底的局部强 度和船体横向 强 度其重要作用1-Inner plating；2-bottom center girder3-solide floor；4-manhole；5-stiffener；6-bottom side girder船 宽 方向transverseLongitudinal3 Tansverse framing double bottomsDalian Ocean University © 2011 DLOU Ocean Engineering50Floors(肋板)：located at each frameFour types(四种肋板形式)：transverseLongitudinal¾Solid floor(主肋板)¾Watertight floor(水密肋板)¾Bracket floor(组合肋板)¾Lightening floor(轻型肋板)3 Tansverse framing double bottomsDalian Ocean University © 2011 DLOU Ocean Engineering513 Tansverse framing double bottomsSolid floor （主肋板或称实肋板）profile: • flat steel with manholes (circle) （diameter>450mm） or drain holes and air hole(透气孔)320 ¾Solid floor(主肋板)Watertight floor(水密肋板)Bracket floor(组合肋板)Lightening floor(轻型肋板)Dalian Ocean University © 2011 DLOU Ocean Engineering52Solid floor（主肋板或称实肋板）location: ¾located at each frames from one ship side to and disconnected at the bottom center girderFitted for the engine room(从一舷伸至另一舷，每个肋位上。

¾ setting a solid floor every two or four frame and the space is no more than 3.2m(每隔2到4个肋位设置一个实肋板）¾ lightening floors are on the remaining frame(其余的肋位上设置轻型肋板)3 Tansverse framing double bottomsDalian Ocean University © 2011 DLOU Ocean Engineering53Manhole or lightening 3 Tansverse framing double bottomsDalian Ocean University © 2011 DLOU Ocean EngineeringSolid floor installation实肋板的安装形式：¾One is inatalling floors at Each frame (每一肋位上安装实肋板)¾Second is every few space to install one, and other types floors installed between the solid floors (每隔几档肋距才装设一个实肋板, 而在实肋板之间的肋位上安装组合肋板或轻型肋板54轻型肋板:不设主肋板的肋位上设置，其厚度与主肋板相同，但上面的开孔尺寸较大，重量较轻，施工比框架肋板方便，目前应用较多3 Transverse framing double bottomsDalian Ocean University © 2011 DLOU Ocean Engineeringƒ Watertight floor（水密肋板)¾ watertight at the setting pressure(没有任何孔且在规定压力下 不透水 的肋板)¾ Location: at the below of watertight bulkhead(在水密的横舱壁下，一般设有水密肋板 )¾尺度比实肋板厚1-2mm,上面有加强筋551-inner bottom内底板2-side girder旁桁材3-stiffener加强筋4-center girder中桁材5-bottom plating船底板6-watertight floor水密肋板7-margin plate内底边板3 Tansverse framing double bottomsSolid floor(主肋板)¾Watertight floorBracket floor(组合肋板)Lightening floor(轻型肋板)Dalian Ocean University © 2。