Soundproof exhaust pipe for a turbine engine

A soundproofed exhaust duct for a turbomachine, the duct comprising:

• a perforated inner shell defining a flow passage of the exhaust duct;
• a solid outer shell, the inner and outer shells defining therebetween a space that is closed at upstream and downstream ends of said space;
• a core containing at least one sound energy dissipating layer made up of hollow beads that are held against one another between opposite perforated walls distinct and extending at a distance from the inner shell and the outer shell;
• and
• a frame distinct from said inner and outer shells, having upstream and downstream portions that are connected together by longitudinal members, the frame supporting the core and partitioning the core into a plurality of boxes that are filled with the hollow beads held between the two perforated walls,
• wherein the frame is secured to at least one of the outer shell and inner shell via at least one of the upstream and downstream portions of the frame.