CB/T 253-1999 Theoretical Line of Metal Hull Components CB/T253-1999 Standard Download Decompression Password: www.bzxz.net

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 thewwW.bzxz.Net
midline of the thickness of the component as the theoretical line
Chain locker coaming
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
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