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Click on the BBA accreditation
logo to download our BBA Certificate in Acrobat PDF format.
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free here.
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Blaston Hollow forms part of
the country lane leading to Blaston Village in South East Leicestershire.
The lane caters mainly for residential traffic, however larger
vehicles, including milk tankers and articulated lorries also
use the road frequently to service the local farms.
It is this heavier traffic over the years, which had started
to erode the road, known locally as Blaston Hollow. |
The hollow is at the bottom
of a hill forming a left hand bend to the north of the village.
Prior to the bend a stream runs under the road and along the
left hand side of the hollow.
It was this area of the lane, some 25 metres, that was reinforced
using Weldgrip soil nails and gabions.
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<< Drilling
operations
The grass verge and side of the road, approximately 3 metres
wide by 2 metres deep, was excavated. Weldgrip Gripforce
® 25 mm diameter by 3 metres long soil nails were installed
into 60mm diameter holes bored both horizontally and vertically
in the excavation.
The horizontal nails were installed at 1 metre intervals under
the road. They were grouted for 2.5 metres of their length,
with 0.5 metres protruding from the excavation. |
The gabions being hand-filled
with granite >>
The vertical nails in the floor of the excavation were installed
to their full length, at 2 metre intervals.
All the soil nails were grouted with OPC cementitious material.
Each nail head assembly had a 250 x 250mm square
9mm thick non--metallic end plate and a standard non-metallic
nut with a threaded end capacity of 80kN.
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<< Gripforce
® soil nails installed in position
Weldgrip 2 x 1 x 1 metre welded mesh gabions were assembled
in the excavation. One soil nail was located through each gabion
wire base and two through each basket side.
The end plates and nuts were tightened to each wire section
to restrain the gabions.The gabions were then hand filled with
granite from a local quarry. |
To re-establish the surface of the road the
top of the gabions were covered with hardcore and tarmaced to
concrete curbing stones. A safety fence was erected behind the
gabions and the excavated soil replaced to complete the roadway
side.
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Fully
loaded gabions ready
for soil replacement |
Gabions
restrained
by soil nails |
The
finished project |
The advantages offered by Gripforce
® fibreglass rockbolts are:
Ease of installation.
Ease of transportation and handleability.
High tensile strength.
High corrosion resistance, particularly important
in the wet conditions.
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Download the Printable PDF Brochure
If you would like to print the brochure for more information
on our soil nails and rockbolts please click on the download
button.
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click
here.
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Bar
& 'AT' Rockbolts
