Watertight and thermally insulating tank built into the bearing structure of a ship having a simplified corner structure

A watertight and thermally insulating tank built into the bearing structure of a ship, said bearing structure including walls substantially parallel to an axis of the ship and forming internal sides of a double hull of the ship and two transverse bulkheads substantially perpendicular to the axis of the ship, said tank comprising:

• a primary watertight barrier contacting a product contained within said tank;
• a secondary watertight barrier located between said primary watertight barrier and the bearing structure of the ship;
• a primary thermal insulating barrier and a secondary thermal insulating barrier, said thermal insulating barriers being alternated with said watertight barriers;
• fastening means for holding said primary thermal insulating barrier pressed against said secondary watertight barrier, said fastening means being substantially continuously in a straight line and being mechanically joined to said secondary thermal insulating barrier;
• and
• a corner connection for connecting elements of said primary and secondary watertight barriers at a corner of said tank in zones where the transverse bulkheads meet the internal sides of the double hull at an intersection ridge, a structure of said corner connection remaining substantially constant along an entire length of the intersection ridge, said corner connection securing said elements of said watertight barriers to opposite sides of a band along weld lines, said weld lines being substantially parallel, said band being oriented such that a mid-plane of said band passes substantially through said intersection ridge, said band being secured to the bearing structure in the vicinity of the intersection ridge.