Fig. 8 | Scientific Reports

Fig. 8

From: Research on the characteristics and mechanism of bottom expansion backfilling anchoring reinforcement in fractured surrounding rock roadway

Fig. 8

Structure diagram of self-expanding head anchor rod. Anchor hole; 2. Self-expanding enlarged head anchor rod; 3 grouting holes; 4. Anchor rod body; 5 pin shafts; 6 left extension components; 7 right extension components; 8 torsion springs; 9 convex oblique blocks; 10 inclined slots; 11 installation holes; 12 sockets; 13. Left connecting plate; 14 Right connecting plate; 15 limit cap; Drill rod 16; 17 ordinary drill bits; 18 hole puncher; 19 wedge-shaped hole expansion; 20 pallets; 21 grouting pipe.

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