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Click on the BBA accreditation
logo to download our BBA Certificate in Acrobat PDF format.
If you do not have Adobe Acrobat Reader you can download it
free here.
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British Waterways have an ongoing
program of maintenance for existing canals and a restoration
program for closed sections of the network.
The Lancaster canal, opened in the early 1800’s is a 42
mile long part of the existing network.
At the southern end of the canal a program of reinforcement
of bridges is being undertaken. |
Work underway on a
busy canal bridge >>
Weldgrip Gripforce ® BBA approved
rockbolts were used to reinforce the first three bridges in
the maintenance program, number 24, 25 and 31.
Celtest installed the 31/15mm tubes into 50mm diameter holes
in the arch stone block on either side of each bridge, including
the keystone block.
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<< The Weldgrip
portable grouting system in action
Seven bolts were used on each bridge, four and three installed
from opposite sides respectively.
Each bolt was positioned equidistant around the periphery of
the bridge-arched section, to overlap the bolts installed from
the opposite side, giving an interlocked finger like construction. |
The keystone block
drilled for bolt insertion >>
The rockbolt lengths varied according to the width of each bridge
and ranged between 3.5 and 4.5 metres long, terminating in the
opposite side arched block.
Each nail head assembly had a 130mm diameter non-metallic end
plate and high load GRN (glass reinforced nylon) nut with a
threaded end capacity of 200kN. The nail head assemblies were
recessed into the bridge arch by over-coring the rockbolt holes.
The over-cored sections were 200mm deep by 150mm diameter.
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All the bolts were fully grouted with cementitious material,
which was pumped through each tube, filling the pre-drilled
holes and any voids in the brickwork.
To maintain the aesthetics of the bridge structure,
the over-cored section of each stone block was replaced after
bolt installation. To validate the integrity of the Gripforce
® reinforcement system, each rockbolt was pull tested to 25kN,
which was 150% of the working load. |
A
pull test being carried out
to 150% of the working load |
A
Gripforce
® rockbolt installed |
Over-Cored
section
being replaced |
The advantages of using Gripforce
® fiberglass rockbolts were:
Ease of installation
Ease of transportation and handleability
High tensile strength.
High corrosion resistance, particularly important in
the wet conditions |
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
