The invention discloses a multi-level back-grasp-type hollow anchor rod. The multi-level back-grasp-type hollow anchor rod comprises an anchoring rod with a grouting passage inside, an anchor head is fixed at the lower end of the anchoring rod, a plurality of back-grasp buckles are fixed on the anchoring rod, a
grout outlet is formed in the anchor head, and the parts, at the upper side of the back-grasp buckles, of the anchoring rod and the parts, at the lower side of the back-grasp buckles, of the anchoring rod are provided with
grout outlets and air return holes respectively, and the
grout outlets and the air return holes are communicated with the grouting passage. Compared with the construction method of a hard
rock body and a soil body, the construction method of the multi-level back-grasp-type hollow anchor rod comprises the steps of (a) preparation of equipment, (b) measurement and distribution of holes, (c) drilling, (d) hole cleaning and detection, (e) inserting of the anchor rod, (f) installation of a grout stop plug, (g) screwing of nuts and (h) grouting, and the anchor rod is directly inserted through the anchor head according to the construction method of a soft soil body, sand and water. The multi-level back-grasp-type hollow anchor rod and the construction method of the multi-level back-grasp-type hollow anchor rod increase the contact area and anchoring force between the anchor rod and the hole wall and prevent the anchor rod from falling out and injuring people. A uniform
cement mortar layer can be formed around the anchor rod through the grout outlets and the air return holes, the damage of
corrosion is avoided, and the purpose of long-time supporting is achieved.