Method for boring hole on screw shaft pipe subsection in supertanker construction

Abstract

The invention relates to a method for boring holes on a screw shaft pipe subsection in supertanker construction, comprising the following steps: firstly, the screw shaft pipe subsection is placed on a jig frame to be completely manufactured in a lying state way, and the center of a screw shaft pipe subsection is found after the screw shaft pipe subsection is qualified by being checked and accepted; then both end surfaces of the screw shaft pipe subsection are drawn with a processing circle and a checking circle, and then a boring machine is vertically hung into the screw shaft pipe subsection to bore the holes. The screw shaft pipe subsection is manufactured in a lying state, the center of the crew shaft pipe subsection can be directly found according to a subsection base line and a horizontal line, and the subsection which is vertically hung into the screw shaft pipe subsection directly bores the holes so as to overcome the defect of deviation formed by deflection generated by the self-weight of the boring machine and insufficient middle support adjustment in the transverse boring process, thereby the invention solves the serious problem that the boring quality can not be ensured and greatly enhances the boring precision and the boring progress.

Description

technical field [0001] The invention relates to ship construction, in particular to a new boring method for segmenting stern tubes in the construction of a VLCC. Background technique [0002] At present, the shafting stern tube centering, boring row installation and boring in the construction of VLCC (Very Large Crude oil Carrier) ship mainly use the following methods: [0003] 1. The shafting alignment of a VLCC ship is generally about halfway through the construction of the main hull, after the segmental welding below the third deck is completed, the tightness of the double bottom cabin is completed, the baseline is submitted and evaluated, and the reference target is submitted, the shafting can be aligned. . The requirements for the centering state are relatively high, and the progress of loading often affects the work of the turbine, resulting in a relatively poor plan execution rate. The accuracy requirements for centering are also relatively high, and at the same tim...

AI Technical Summary

Problems solved by technology

The middle support is very large, it is impossible to enter the stern tube to adjust it, and the accuracy of the adjustment cannot be guaranteed

Due to the deflection caused by the weight of the boring row itself and the deviation caused by the improper adjustment of the intermediate support, the bored hole will have a large ellipticity and taper, and the quality of the boring hole cannot be guaranteed.

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