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| Project
Title |
Lancaster
Canal Bridge Reinforcement |
| Client |
British Waterways |
| Main Contractor |
Dew Constructions Ltd |
| Sub Contractor |
Celtest Ltd |
| Featured
Products |
Weldgrip Gripforce
® Rockbolts |
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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. 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. 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 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.
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.
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
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- 620k |
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Weldgrip are also proud to have attained
BBA accreditation and ISO 9001 standards in recognition of our continuing
excellence in Geotechnical products and services. |
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