FIELD: machine building.
SUBSTANCE: invention relates to riser joints. Thread joint assembly comprises first and second tubular components with rotational axis (4). Female threaded zone (10, 30) made at outer circular surface is arranged at one end (1, 3) of every component. Every said end (1, 3) terminates in end surface (15, 35) including means (14, 34) making toothed coupling of straight transfer to allow locking of said first and second tubular components at spinning. Said assembly comprises extra third tubular component with its rotational axis (4). Two female threaded zones (20, 20') are arranged on inner circular surface at every end of said third tubular component (2, 2'). One of two male threaded zone (10, 30) can interact by uncoupling from one of two female zones (20, 20'). While another male threaded zone can interact with another female threaded zone. Male end (1) of the first tubular component and appropriate female end (2) of third tubular component comprises means (11, 21) for free spinning. Said male zone (10) screwed in female zone (20), said tubular components can spin free relative to each other.
EFFECT: lower risks of uncoupling in operation.
13 cl, 7 dwg
