 |
| Project
Title |
A638 Wakefield
Road Rocknetting at Dewsbury, West Yorkshire |
| Client |
Kirklees Metropolitan
Council |
| Main Contractor |
Total Access [UK] Ltd |
| Featured
Products |
Weldgrip Gripforce
® Rockbolts, Weldgrip Drilling Machines,
Weldgrip Drill Steels, Weldgrip PVC Coated Steel Mesh |
|
 |
The Dewsbury rock netting project was
a Kirklees Metropolitan Council scheme to protect the safety of pedestrians
and motorists from the possibility of rock fall on to the A638, Wakefield
Road, near Dewsbury town center.
The area protected was a rock cutting of approximately 10 metres vertical
height, above an existing 3 metre high retaining wall. The rock slope
above the retaining wall was secured by Weldgrip PVC coated mesh and Gripforce
® Rockbolts. Two areas were netted, one approximately 100 metres and
a 50 metre length, joining into an existing area which had been netted
previously.
Loose vegetation was removed from the slope, with care
taken not to disturb any plant and tree root systems. Galvanised and PVC
coated welded steel mesh with an aperture size of 75 x 75mm was used to
secure the rock slope. The rolls of mesh were laid from the top of the
slope, overlapping adjacent sections by 225mm. These were joined together
by stainless steel clips, using a compressed air clipping gun.
Weldgrip Turmag compressed air drilling machines and
hollow turbine scroll drill steels, with twin wing bits, were used to
drill the 32mm diameter rockbolt holes. An air flush method of drilling
was employed.
Weldgrip 25mm diameter Gripforce
® Rockbolts were used to secure the netting. The 2.5m long bolts were
placed at 3 metre centres along the top and bottom of the slope. Shorter
1.5m long bolts were used as required, to secure the mesh between the
two rows. The rockbolts were installed into two 800mm long polyester resin
slow set capsules. To ensure the resin was mixed correctly, the rockbolts
were spun through the capsules to the back of the hole.
A stainless steel rope was secured along the top and bottom rows to tension
the mesh. All the work carried out on the slope was by rope access. On
site pull test were done to test the bond strength between the rock/resin
interface. Tests were made on bolts installed at the top of the slope
to 40kN of load.
A scaffold was erected from the footpath to 1 metre above the top of the
existing wall, as a temporary safety fence whilst work was carried out.
The PVC coated mesh was secured by tightening the nuts onto 150mm diameter
end plate assemblies.
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- 620k |
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- 246k |
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Weldgrip are also proud to have attained BBA accreditation and ISO
9001 standards in recognition of our continuing excellence in Geotechncial
products and services. |
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