巴拿马导缆孔单双式问题

muscular

各位大拿，关于巴拿马导缆孔单双式问题有谁清楚的麻烦解释一下：
  下面这段话里的double chock到底指的什么样子，有没有double 和single 之分。
All chocks for the Panamax Plus and New Panamax vessels shall be double chocks and shall have a throat opening area of not less than 900 square centimeters (preferred dimensions are 355

xuzhengfeng

(3) Chocks designated as single chocks shall have a throat opening of not less than 100
square inches (650 square cm) in area — preferred dimensions are 12 x 9 inches (305 mm
x 230 mm) — and shall be capable of withstanding a SWL of 100,000 pounds (45.36 tons)
on a towing wire from any direction.
(4) Chocks designated as double chocks shall have a throat opening of not less than 140
square inches (900 square cm) in area — preferred dimensions are 14 x 10 inches (355 mm
x 255 mm) — and shall be capable of withstanding a SWL of 140,000 pounds (64 tons) on
the towing wires from any direction.

muscular

xuzhengfeng 发表于 2017-5-10 14:28
(3) Chocks designated as single chocks shall have a throat opening of not less than 100
square inch ...

谢谢这位兄弟，明白了。所谓单双式原来是过一根两根缆绳的区分，喉部面积和承载大小的问题。

abbey20001225

形式可以参照国标或者ISO标准。哪些位置需要布置什么样的可以参照巴拿马运河要求中的 GIGURE 6-Location of Chocks and Bitts.