 |
| Project
Title |
Sidmouth Connaught
Gardens Cliff Reinforcement/Rock Netting |
| Client |
East Devon District Council
|
| Consultant |
David Roche Geo. Consulting |
| Main Contractor |
Colin Jones [Rock Engineering
Ltd] |
| Featured
Products |
Weldgrip Fibregrip
® Rockbolts & Weldgrip Drilling Equipment |
|
 |
The Connaught Garden Cliffs at Sidmouth
are 15m to 18m high, overlooking the sea. Weathering of the red sand-stone
cliffs has made the footpath below the cliff face dangerous for public
access.
Major work was carried out to reinforce areas of the
cliff face and to secure the top section by Rock Netting over a length
of 140m, to prevent any loose weathered rock from free fall. Vegetation
was cut back at the top of the cliff and a Polyester Geogrid - overlaid
by a plastic coated wire mesh - was secured to the face by Weldgrip Fibregrip
® Rockbolts.
To re-establish the vegetation Hydroseed was used on
the top section of the cliff. The rockbolts used were 22mm diameter x
1m long, with an 80kN nut and a 150mm diameter high load plastic end plate.
The rockbolts were installed into 42mm diameter holes and grouted with
a ratio of 0.4% water to O.P.C. (Ordinary Portland Cement).
The holes were drilled using a Weldgrip Turmag pneumatic
hand held rotary drilling machine and turbine scroll auger rods with 42mm
wing bits. All the holes up to 3m in length, both for the reinforcing
and rock netting, were drilled using this method. All the work carried
out on the cliff face was by rope access.
The lightweight construction of the Weldgrip drilling
equipment and Fibregrip ® Rockbolts
gave better handleability and therefore improved safety for the rope access
work.
Other advantages of using Weldgrip Fibregrip
® Rockbolts were:-
- Quick and efficient method of installation
- Cost effective, high corrosion resistant material
for harsh environments
- Installation of the non-metallic end plates was more
sympathetic to the plastic coated wire netting than steel plates.
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