A hydraulic expansion anchor suitable for breaking a surrounding rock mass and a method of using the same

Abstract

The application discloses a hydraulic expansion anchor rod suitable for breaking surrounding rock mass and a use method thereof, and relates to the technical field of rock anchors. The anchor rod body of the anchor rod is provided with one end which is inserted into the broken surrounding rock mass around a drill hole to anchor and form an anchoring section, and the other end which is a free end and is stretched out of the surrounding rock mass and anchors the surrounding rock mass by applying a tensile stress. The water injection bag is sleeved on the anchor rod body and is in sealing and close contact with the anchor rod body. After water injection, the water injection bag expands along the axial and radial directions of the anchor rod body respectively, and respectively applies axial extrusion to the anchoring section and the free end, applies radial extrusion to the broken surrounding rock mass around the water injection bag, and fully contacts the broken surrounding rock mass, so as to provide three-phase stress for the broken surrounding rock mass around the drill hole. The application expands the wrinkled water injection bag by water injection, compacts the surrounding broken rock mass, and increases the integrity of the broken surrounding rock mass and the friction between the anchor rod structure and the broken surrounding rock mass.

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