The use of hollow anchor rods usually includes the following steps:

1. Drilling: According to the design requirements, use drilling equipment to drill holes of appropriate diameter and depth in the rock and soil mass that requires support.

2. Hole cleaning: After drilling, remove debris, soil, and accumulated water from the hole to ensure cleanliness.

3. Insertion of anchor rod: Carefully insert the hollow anchor rod into the drilled hole, ensuring that the insertion depth of the anchor rod meets the design requirements.

4. Install shims and nuts: Install shims on the exposed end of the anchor rod, tighten the nuts, and apply a certain pre tightening force initially.

5. Grouting: Grouting is carried out through the hollow part of the anchor rod, and the grouting material can be cement slurry or other suitable slurry. During grouting, the grouting pressure and amount should be controlled to ensure that the grout fully fills the gap between the anchor rod and the hole wall.

6. Inspection and grouting: After grouting is completed, check the grouting effect and, if necessary, perform grouting treatment.

7. Monitoring and maintenance: During use, monitor the support effect of the anchor rod, and take corresponding maintenance measures in a timely manner if there are any abnormalities.