Track forming a gas-throughflow duct and provided with a movable gas passage unit

A track forming a gas throughflow duct, the track being of the type adapted for guiding a movable gas passage unit therealong in sealing cooperation with the gas throughflow duct, the track comprising:

• (a) a plurality of structural girders connected to each other through butt joints by which said girders are disposed in mutually, abutting, end-to-end relationship to form an elongated structural beam;
• (b) means for effecting interconnection of said girders to each other in said abutting relationship;
• (c) A plurality of lateral sections depending from said girders in spaced pairs, said lateral sections contributing to defining the gas throughflow duct, said lateral sections also defining a lower slot therebetween, each lateral section having an upper side and a lower side, said lateral sections mating with said girders in a connection region, said connecting region being adjacent said upper sides of said lateral sections;
• (d) a plurality of interengaging sealing sections coupled with said lateral sections to seal said lower slot, said sealing sections being adapted to sealingly engage the movable gas passage unit and, while maintaining such seal, to allow the gas passage unit to be moved along said beam;
• said girders, lateral sections, and sealing sections together defining an interior duct passage;
• (e) means, in said connecting region, for facilitating and effecting rapid coupling of said lateral sections to said girders;
• (f) means, adjacent said lower sides of said lateral sections, for enabling rapid joining of said sealing sections to said lateral sections, said enabling means including catches adjacent said lower sides of said lateral sections;
• and
• (g) said means for effecting interconnection of said girders including said lateral sections, each lateral section extending longitudinally to either side of at least one of said butt joints.