Standard ICS number:Shipbuilding and offshore structures>>Shipbuilding and offshore structures>>47.020.01 General standards for shipbuilding and offshore structures
Standard Classification Number:Ship>>Ship General>>U04 Basic Standard and Common Method
CB/T 253-1999 Theoretical Line of Metal Hull Components CB/T253-1999 Standard Download Decompression Password: www.bzxz.net
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UDC629.12.011:669 National Standard of the People's Republic of China GB-5740--85 C6/253-1999 Theoretical line of metallic hull structure Molded line of metallic hull structurePublished on 1985-12-26 Implemented on 1986-10-01 Approved by the State Bureau of Standards National Standard of the People's Republic of China Theoretical line of metallic hull structure Molded line of metallic hull structureUDC629.12.011 GB5740—85 The theoretical line of metallic hull structure (expressed as ML) specified in this standard is the reference line for determining the installation position of hull components. Basic principles for determining the theoretical line 1.1 The back side of asymmetric profiles is the theoretical line. 1.2 The theoretical line of deck, platform and inner bottom plate is the side close to the baseline (indicated by BL). 1.3 The theoretical line of plate and transverse bulkhead is the side close to the ship's touch (indicated by). The theoretical line of longitudinal girder and longitudinal bulkhead is the side close to the hull centerline (indicated by 4). 1.4 For components that do not comply with the provisions of this standard, the position of the theoretical line shall be marked. The theoretical line of plate shall be in accordance with Table 1. Component name Deck, platform, Theoretical line position The side close to the baseline is the theoretical line The inner edge of the plate is the theoretical line Promulgated by the National Bureau of Standards on December 26, 1985 Inner bottom plate Implemented on October 1, 1986 Component name Transverse bulkhead, corrugated transverse bulkhead Longitudinal bulkhead Longitudinal bulkhead GB5740-85 Continued Table 1 Theoretical line position The side close to the ship's touch is the theoretical line The side close to the ship's touch is the theoretical line The side close to the centerline of the hull is||tt| |Theoretical line Number of broken Longitudinal bulkhead Component name Middle inner keel, middle girder Middle longitudinal bulkhead Longitudinal bulkhead of wing water tank GB5740-85 Continued table 1 Position of theoretical line Middle longitudinal component takes the midline of its thickness as the theoretical line Middle longitudinal bulkhead takes the midline of the lowest row plate as the theoretical line Take the side where the stiffener is arranged as the theoretical line Inner bottom plate Inner bottom plate Stiffer Middle inner keel Middle longitudinal bulkhead Longitudinal bulkhead of wing water tank Theoretical lines of profiles and plate components are as shown in Table 2. Component name Frame, rib plate (taking bracket overlap as an example) Frame, folded rib plate GB5740-85 Theoretical line position a. The theoretical line of ribs and beams is the back surface of the steel section. b. The theoretical line of strong ribs and strong beams is the side close to the ship swell . c. The lower ribs, strong ribs, and strong transverse beams of the hatch end coaming are consistent with the theoretical line of the hatch end coaming a. The ribs, strong transverse beams, and strong ribs of the hatch end coaming are connected with the theoretical line of the hatch end coaming by brackets or deck longitudinal hatch longitudinal girder side longitudinal back as the theoretical line. b. The lower ribs, strong transverse beams, and strong ribs of the hatch end coaming are consistent with the theoretical line of the hatch end coaming a. The side close to the centerline of the hull is the theoretical line. b. The lower longitudinal girder of the hatch is consistent with the theoretical line of the hatch coaming plate. c. The side close to the baseline is theoretical Strong transverse beam Inner bottom plate Hatch end coaming Hatch end coaming Strong transverse beam Hatch coaming Hatch longitudinal girder Day plate longitudinal girder Dazzling side longitudinal grid Component name GB5740-85| |tt||Continued Table 2 The deck of the folded edge plate takes the back of the plate as the theoretical line longitudinal girder, side keel, side inner keel, hatch dirty side longitudinal girder deck longitudinal cabinet side keel side girder in the engine room area a, and takes the side close to the centerline of the hull as the theoretical line. b. In line with the theoretical line of the base girder Side girder. Deck girder Inner keel· (Hatch coaming Hatch girder Gate perimeter plate Base girder Base girder Side girder Component name Side girder in other areas GB5740--85 Continued Table 2 Theoretical line position a. The side close to the centerline of the hull is the theoretical line. b. The theoretical line of the side girder or the inner keel connected to the base is consistent with the base girder Closed pillar , chain locker wall, base, hatch coaming, smokestack, shaft tunnel theoretical lines according to Table 3. Figure Component name Closed symmetrical profile GB5740-85 Theoretical line position Taking its symmetry axis as the theoretical line Cylindrical chain locker wall with the outer edge of the wall as the theoretical line Square chain locker wall a, with the outer edge of the wall as the theoretical line. b. Take the midline of the thickness of the component as the theoretical line Chain locker coamingwwW.bzxz.Net Chain locker centerline Component name Base girder Hatch coaming GB5740-85 Continued Table 3 Theoretical line position| |tt||a. The theoretical line of the foundation girder is the side close to the centerline of the shaft . b. The theoretical line of the foundation girder panel is the lower edge of the panel The theoretical line of the base girder The theoretical line of the side close to the centerline of the hatch Foundation girder Component name Smoke window, shaft tunnel Theoretical line position GB5740-85 Continued Table 3 The theoretical line is the inner edge of the plate The theoretical line of the underwater product with thick and thin internal pressure shell and bulkhead is in accordance with Table 4. Table 4 Component name Frame on the outer edge of the shell Frame on the inner edge of the shell With thick and thin plates Bulkhead Theoretical line position Take the inner edge of the thin plate as the theoretical line Inner bottom plate Inner bottom plate Take the inner edge of the shell plate as the theoretical line Inner edge of the shell plate The side close to the ship's touch is the theoretical line Strengthening material GB5740-85 Appendix A Typical examples (Supplementary) The schematic diagram of the theoretical lines of the hatch coaming and longitudinal tank of a container ship is shown in Figure A1. A Hatch coaming Longitudinal bulkhead Inner bottom plate A.2 The schematic diagram of the theoretical lines of the hatch coaming of a loading ship is shown in Figure A2. 10 Hatch girder Strengthening girder Tip: This standard content only shows part of the intercepted content of the complete standard. 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