一般文献所给出的四点吊桩的吊点布设是以吊索等长为前提的。
The arrangement of four lift points to hoisting a pile, as given in general technical literature, is on the premise of slings with equal length.
机械装臵、带缆桩、艇吊和其它重型负载集中区域下方的甲板应采用短纵桁或复板进行加强，具体应经过船级社认可。
Decks under machinery, bollards, boat davit and other heavy concentrated loads to be reinforced by carling or welded doubler where necessary as approved by Class.
以长桩结构能够承受的最大弯矩和吊点力不为负值作为限制条件，得出安全作业跨距和倾角参数控制曲线。
With the limitations of the maximal bearable bending moment and the positive lifting force, the controlling parameter curves of span and lifting Angle are then acquired to guide the safety operation.
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