Ground anchor

The utility model discloses a ground anchor, including drilling rod and drill bit, the drilling rod is cylindrical hollow tube, the drill bit is installed the drilling rod bottom, the drill bit includes base and plural number piece flap valve, the flap valve with the base is connected through the pivot, install the torsional spring in the pivot. The utility model discloses a drill bit is equippedwith flap valve and water injection membrane bag, and the flap valve is outwards opened in water injection membrane bag expansion line, forms to enlarge the anchor head and promote the flap valve to form the support flank, will improve earth anchor extraction resistant performance greatly, opens the relief valve during uninstallation, and the water is discharged in the water injection membrane bag, and the flap valve no longer provides the holding power to last earthing, makes things convenient for the drilling rod rotation to extract. 本实用新型公开种地锚装置，包括钻杆和钻头，所述钻杆为圆柱形空心管，所述钻头安装在所述钻杆底端，所述钻头包括底座和复数片活瓣，所述活瓣与所述底座通过转轴连接，所述转轴内