| Tweet |
Custom Search
|
|
|
||
 TB 55-1900-201-45/1
b. "Flats", "dutchmen" or short lengths of planking are normally not accepted since they will not hold fastenings
and are structurally unsound.
c. In vessels with usual frame spacing, the replacement plank should extend at least six frame spaces and no
portion of a plank shorter than six frame spaces should be allowed to remain.
d. Where special conditions govern, this rule may be modified, as a lower limit, the replacement plank will be at
least five feet long and its butts shall be spaced in accordance with the rule for butts in paragraph 18.
e. Fastenings shall be at least equal in size and number to those of the rest of the planking.
f. It is sometimes necessary to shape the inboard side of a replacement plank to fit tightly against the frame. The
use of shims or packing pieces for this purpose shall not be allowed.
g. The same principals apply to diagonal planking, but due to the relatively short lengths of the individual planks a
portion of a plank is seldom replaced.
h. Since the proper repair of double diagonal planking is ex- pensive and time consuming, repairs involving the
use of dutchmen and backing blocks will not be permitted. Most other planking systems follow the same basic principles
of repair as outlined here.
2-13. Butt Joints in Planking.
a. Normally, planking butts should not terminate on frames. They will be located between frames on proper butt
blocks. In light construction with narrow strakes they may sometimes by found as glued scarf joints at the frames and in
some construction with massive framing they may be found butted on the frames. As a general rule, butts in adjacent
planks shall be at least three frame spaces apart. Those butts which fall in the same frame bay, shall be separated by at
least three solid strakes. Where frame spacing is unusual, the following may be used as a guide.
b. Butts in adjacent strakes will be no closer together than five feet. If there is a solid strake between, they shall
be no closer than four feet. Butts shall be shifted so that three or more do not fall on a diagonal line. To be effective, a
butt block must have adequate size. If the frame spacing allows, its length should be equal to the planking thickness and
its width at least one inch greater than the strake width.
c. The fastening of the strake to the butt block shall be of equal or larger and no fewer number of fastenings
should be allowed.
2-14
|
||
|
||
