The finished drill pipe made of hollow grouted bolt raw materials is mostly used for relatively stable and complete rock formations. Anchoring agents such as resin, engineering glue, and quick-setting cement are injected from the center of the bolt, which has better anchoring quality than ordinary bolt.Due to the emergence of self-propelled hollow grouting bolts, hollow grouting bolts can also be used in formations under loose geotechnical conditions.? The bolt body of the hollow bolt adopts a hollow design, and the middle hole of the rod body is used as a high-pressure drilling channel and a grouting channel for drilling. Compared with the solid rod body, the hollow rod body design can obtain better stiffness and shear strength.The full-length standard large-pitch threaded structure on the outer surface of the bolt, the threaded structure facilitates the cutting and lengthening of the bolt, and the bonding area between the bolt body and the grouting material is increased compared with the smooth rod body, thereby improving the anchoring force.

 Hollow bolt and hollow rod design can obtain better steelness and shear strength compared with solid rod body.The outer surface of the bolt is a full-length standard large-pitch threaded structure. The threaded structure facilitates the cutting and lengthening of the bolt. Compared with the smooth rod body, the bonding area between the bolt body and the grouting material is increased, thereby improving the anchoring force.Pressure grouting of the bolt through the hollow rod body can achieve the purpose of consolidating the broken rock mass, cutting off groundwater and anticorrosion of the rod body, and quickly forming a supporting force to control the stability of the surrounding rock.