Patent ID: 7506603

Claim:
A method for manufacturing an unsinkable hull structure, comprising the following steps: arranging a bottom hull ( 1 ) on a first mold ( 9 ), and a similar covering ( 4 ) for said hull ( 1 ) on a second mold ( 10 ); arranging and fixing a plurality of longitudinal structural elements ( 6 ) on said bottom hull ( 1 ) and in the longitudinal direction of said hull ( 1 ); arranging and fixing a plurality of support and locking means ( 8 ) on free edges of each longitudinal structural element ( 6 ) by means of structural adhesives; arranging structural adhesive on an external surface of said plurality of support and locking means ( 8 ) by providing a respective plurality of support and connection surfaces for an internal surface of said second covering ( 4 ) on said hull ( 1 ); closing and locking said molds ( 9 , 10 ) in position one on the other by means of locking means ( 12 ); carrying out an injection of a foaming material ( 3 ) in a space defined between said bottom hull ( 1 ) and said covering ( 4 ) and in each single compartment delimited by at least one longitudinal structural element ( 6 ) between said bottom hull ( 1 ) and said covering ( 4 ); and following the drying and hardening of said foaming material ( 3 ), releasing the group of the moulds ( 9 , 10 ) and extracting the group formed by hull ( 1 ) and covering ( 4 ).