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Has Enough Rigidity
Jun 12, 2018

The lifting column is an automated device that belongs to the ship's equipment. The lifting column is used to support the boom, and the upper end of the lifting column can be used to fix the column of the traction rope. Can be divided into door columns, V-pillars, cranes, etc. The portal column is composed of two columns and a cross member and is in the form of a portal. The V-pillar consists of two pillars with their tops tilted to both sides. Lifting rakes are rakes on the centerline of the hull that also serve as lifting columns.

The lifting column is a strong member for fixing the hanger bar, the hanger cable, and the jack pulley, and is usually a hollow cylinder welded by the steel plate. The parts of the column that are subjected to concentrated loads, such as boom holders, jacking eye panels, and sacral rope eye panels. All should be properly reinforced, or covered, or increased in wall thickness. When reinforced with cladding, the height and width of the cladding should be slightly greater than the height and width of the above parts, or the outer diameter of the lifting column thereat. The vertical and horizontal seams of the lifting columns made of bent steel plates shall be single-face groove butt joints and shall be completely penetrated by a low hydrogen type electrode.

Single-column and portal-shaped coffins are sometimes reinforced with stays. However, due to the obstruction of the loading and unloading operations of the cargo and the improvement of the mast structure, it has been rarely used to reinforce the supporting cables. Both the herringbone and the v-shaped rake are not reinforced with ties. However, if the herringbone model is to consider setting up a heavy-duty pylon, provision is made for temporary reinforcement of the detachable stays along the longitudinal direction of the vessel.

The lower part of various types of lifting columns basically adopts two supporting point fixing ways. Most of the lower pillars are supported on the middle deck or on the double bottom, and sometimes on the shaft tunnel; the upper support point is fixed on the upper deck; if a deckhouse is provided on the lower part of the mast, the deckhouse is The top deck can be used as the upper support point and the lower support point is located on the upper deck. The hull structure, which is the supporting point of the lifting column, should be reinforced and have sufficient rigidity.