Long anchor rod pre-supporting device applied in unstable stope roof

The utility model discloses a long anchor rod pre-supporting device applied in an unstable stope roof, which is used for pre-supporting of the stope roof, the broken hanging wall of the ore body and local crushed zone of roadway of an underground mine. The long anchor rod pre-supporting device is characterized by consisting of a deformed steel bar (3), a binding rope (4), a vent hole (5), a gas-guide pipe (6), a wood stopper for plugging holes (7) and a grouting pipe (8). The deformed steel bar is 16 to 20mm in diameter and 12 to 25mm in length; the gas-guide pipe is 10mm in diameter; the wood stopper for plugging holes is made of solid wood, and the upper cross section and the lower cross section are round platforms which are 60mm and 80mm in diameter and are both 17.5mm in dip length; a grouting hole (9), a deformed steel bar hole (10) and a gas-guide pipe hole (11) are drilled in the wood stopper for plugging holes and are 25mm, 20mm and 10mm in diameter respectively; the grouting pipe is 25mm in diameter. The long anchor rod pre-supporting device is simple in structure, safe and convenient in operation and reliable in performance.