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The Tondu Iron Works wall stabilisation
project is part of the refurbishment to one of Cadw industrial
sites.
The 200 year old Iron Works has many historic features including
buildings, a large square chimney feature and a series of open
grate furnaces.
The Iron Works were built into the side of a hill, with ramps,
gangways and part of the open furnace section protected by a
12 metre high retaining wall. |
The first phase of the project was to dismantle
and rebuild the top 3 metres of the wall and reinforce the whole
area with soil nails. Weldgrip Vinylester GRP soil nails were
used because of their high tensile and shear strength characteristics
and also their excellent corrosion resistant properties. The
nails were 8 metres long, installed through the wall and into
the made ground behind. |
Weldgrip Gripforce
® 25mm soil nails were installed in the wall. The nails
have a tensile strength of 500 kN and a shear strength of 167
kN.
The bar has a rough profiled finish to give good grout/bar bond
strength characteristics.
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Each nail head assembly consisted
of a 125mm GRN (Glass Reinforced Nylon) end plate and a high
load nut capable of withstanding forces of up to 180 kN.
The nails were installed into 80mm diameter holes, filled with
OPC cementitious grout.
The holes were spaced along the wall at 1.5 metre centres, with
row spacing at 1 metre.
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All the holes were drilled
using rotary drilling equipment to limit the amount of vibration
on the wall.
The nails were countersunk into the wall, by
overcoreing the holes, 250mm long by 150mm diameter.
To improve the aesthetics of the finished work part of the cored
stone was replaced to completely hide the nail head assembly. |
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To validate the grout/soilnail
interface sacrificial on-site test nails were axially loaded
to 120kN.
The advantages of using the Weldgrip Gripforce
® soil nail system are:- |
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Ease of installation.
The light weight construction enabled longer lengths
of bar to be used without couplers.
High corrosion resistance.
High tensile and shear strength.
High end load nut assemblies.
Non-metallic end plates, maintaining the corrosion
resistant integrity of the whole nail system.
Light weight bar gave savings on transport and installation
costs.
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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.
You will need Adobe Acrobat Reader to view and print the brochure,
if you need to download a free version of Acrobat Reader please
click
here.
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4.2 meg |
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Bar
& 'AT' Rockbolts
