FIBROUS COMPOSITE MATERIAL PIPE WITH METAL END BRANCH PIPES, METHOD OF MANUFACTURE AND DEVICE FOR REALIZATION OF THIS METHOD Russian patent published in 1997 - IPC

FIELD: pipe column for production of ferromanganese concretions from deep depths. SUBSTANCE: steel pipes overload columns and there is danger of their break in course of operation. Proposed glass-reinforced plastic pipes are provided with metal branch pipes which are connected by means of threaded joints. Thread has special profile in form of rectilinear section and undercutting where rod bent by conical spiral is located, fibres of material of pipe are wound around this rod in layers through 180 deg. Branch pipes are fitted in pipe in pairs after preliminary matching points of thread finish on technological tool on which they are fitted by one generatrix. Motion screw has right-hand and left-hand threads whose pitch is equal to pitch of thread of branch pipes. Right-hand and left-hand carriages are moved from center to sides, thus ensuring regular structure of joint. EFFECT: enhanced reliability. 4 cl, 3 dwg