Subsection division method for cargo hold area of thin film type LNG ship

Abstract

The invention discloses a subsection division method for a cargo hold area of a thin film type LNG (Liquefied Natural Gas) ship. The subsection division method comprises the following steps of: 1), dividing all key nodes W1-W5 on the inner shell wall of a cargo hold into segments; 2), arranging a large joint between the two cargo compartment areas in a transverse compartment; 3), dividing each transverse compartment independently; and 4), dividing a liquid dome area into independent sections. The subsection division method is more scientific and reasonable, greatly reduces labor intensity, is good in implementation effect, the cargo space building precision of a cargo space area and structural centering precision of key nodes can be guaranteed and the method has the advantages of reducing dock carrying and hoisting, reducing assembling and welding workload of dock large joints and paint damage amount; dock and wharf fitting-out work forward movement is achieved to the maximum extent, ship launching integrity is improved, and the dock period is further shortened.

Description

technical field [0001] The invention relates to shipbuilding, in particular to a method for segmenting the cargo hold area of ​​a membrane-type LNG ship. Background technique [0002] In the section division of the cargo hold area of ​​the existing membrane-type LNG ship, except for W4, the key nodes of the inner shell wall, the other W1, W2, W3 and W5 are all classified as large dock joints. In addition, these nodes are designed with three Surface welding design form; in the division along the length of the ship, all transverse large joints (circumferential joints) are arranged in the cargo hold area, and the existing divisional division method has the following disadvantages and deficiencies: [0003] 1. Since the above-mentioned key nodes of W1, W2, W3 and W5 are all formed after loading in the dock, it leads to high precision control requirements in the dock loading stage, heavy assembly and welding workload, difficult to guarantee welding quality, and large welding defo...

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Problems solved by technology

[0003] 1. Since the above-mentioned key nodes of W1, W2, W3 and W5 are all formed after loading in the dock, it leads to high precision control requirements in the dock loading stage, heavy assembly and welding workload, difficult to guarantee welding quality, and large welding deformation.

It is not conducive to shortening the dock construction cycle and improving the efficiency of dock construction

[0004] 2. Arrange all the circular joints in the cargo hold area, the deviation caused by hoisting positioning accuracy, welding deformation, etc. is very unfavorable to the accuracy control of the flatness of the shell wall in the cargo hold area; since there is no transverse compartment as a support, it is located in the cargo hold The deck section and sheer top section above the area must be fully assembled before docking, and the W3 node is the dock closing node of the general section. Through the feedback of actual ship construction accuracy measurement data, the accuracy of the W3 node The deviation is relatively large, and the workload of welding and rework in the dock stage is very large, which is not only labor-intensive and time-consuming, but also affects the quality and cycle of ship construction

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