Anchor rod is an anchoring measure adopted to ensure the stability and safety of the surrounding rock of underground caverns, ground slopes, and foundation. Generally, it is grid layout on the full excavation surface. There are many types of system anchor rods. Mortar anchor rod, that is, install the threaded steel bar after drilling the hole and then grouting the hole, and some are the construction sequence of first grouting and then inserting the steel bar. The longitudinal and transverse distance of the anchor rod is generally 1.5-2m, and the diameter is generally more than 20mm. Single anchor The pull-out force of the rod is generally greater than 5t. The system anchor rod is generally used at the same time as the shotcrete layer on the excavation surface, and the force is combined.