July 2010
Due to consecutive rock falls on the cliff at the end of the retirement centre building, 17 rock bolts were drilled and a mesh was installed.
Third mesh at Frances Hodgkins
Category: Dunedin
Second mesh at Frances Hodgkins!
Access: Even with a fragile barrier at the top of the slope, we are still able to find a way to rig safely.
Drillability: The presence of clay at different depths has obliged us to alternate the use of a down hole hammer and drag bits, to drill top anchors 4m deep embedded in 90mm holes, whereas on most jobs of that kind just a hand-drill and 2m holes should do.
Useful Mesh
150 m2 of mesh, with 5 x 4 meter deep top anchors, 24 x 2-3m deep bolts … and a lot of hard and smart work!
Result: 15 meters along the cliff are now protected from landslides, rockfalls and erosion.
This remedial work was done after a landslide, which took half of the barrier.
