TAILIEUCHUNG - Lesson 8-Workmanship for Hull Building(2)

Tham khảo tài liệu 'lesson 8-workmanship for hull building(2)', ngoại ngữ, anh văn thương mại phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Lesson 8-Workmanship for Hull Building 2 4. Fabrication and Welding of Hull When building a hull we will normally divide the hull construction into a number of components which are termed as blocks or sections assembled separately and then fabricated into an integral hull on a berth or a slipway. This workmanship mainly includes A Part fabrication-to assemble different kinds of members into a whole part after their processing. B Block or section fabricatiom-to assemble different parts into a block or section. C Berth or slipway fabrication-to assemble a few blocks and sections into an integral hull. Division of Sections Division of sections is of great importance for not only the strength of hull itself but also the convenience and reasonableness of operation as well as the production procedure lifting capacity and arrangement of the working site have got to be taken into our account. To make the matter worse the aforementioned factors are frequently contrary to one another in one way or another. Therefore it is not rare for us to rack our brains to find ways and means available. Fabrication and Welding of Parts The fabrication and welding of parts such as frames beams girders and seatings to be performed on a platform in term of the concerned drawings. Fabrication and Welding of Blocks and Sections The fabrication and welding of blocks such as side bottom deck and superstructure to be conducted on a jig. In respect to sections two methods for their fabrication and welding are available A Pyramid Method The practice of this method is as follows First lift a bottom block onto a berth or a slipway and take it both as a base and a jig. Then assemble side blocks and bulkhead blocks. Still then assemble the deck block. By the pyramid method all are done bit by bit through welding. B Converse Method This method is good for bow section stern section deckhouse and superstructure the main characteristic of which is to regard the deck block on a berth or a .