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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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Reinforcement of the Chatham
Dock walls is part of a larger project to redevelop the old
naval yard for business and private construction purposes.
The old harbour walls were once part of a large Royal Naval
base and have protected the site from tidal flows of the river
Medway for many years.
To ensure the future protection of the site the dock walls were
strengthened. |
The project involved repairing old brickwork, increasing
the height of the wall by casting concrete parapets on top of
the existing structure and reinforcing sections of the old wall
by installing reinforcement vertically down through the brick
and concrete structure.
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Weldgrip
Gripforce ® hollow injection tubes were used for
the vertical reinforcement. The tubes are constructed from a
high strength specialist 'E' glass and Vinylester hybrid material
developed to withstand the harsh environments typically found
in this type of environment.
The injection tubes have an O.D/I.D. of 31/15mm with tensile
and shear strengths of 480kN and 195kN respectively. |
The tubes used are 6m in length
with 100mm of thread at one end to facilitate the attachment
of a grout injection adapter.
The Gripforce ® tubes were
installed into 45mm diameter holes at 0.5m centres on either
side of the wall.
On the river side the tubes were installed through the granite
coping stones and on the land side through the concrete wall
structure.
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To maintain the aesthetics
of the harbour wall all the tubes were countersunk into the
wall.
The holes drilled into the granite were overcored (100mm long
by 75mm diameter) with the overcored material being replaced
after the tubes were installed. |
The holes were drilled with pneumatic rotary percussive drilling
machines using hollow hexagon extension drill rods and 45mm
cross head bits and an air flush system to remove the drilled
debris.
After drilling, the holes were grouted by pumping cementitious
material through the Gripforce
® hollow tubes, this forced out any excess water concentrated
in the bottom of the holes as well as ensuring the whole 6
metres of tube was fully grouted.
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The Weldgrip Grout System,
which consists of a 75 litre mixing bin with an air motor to
rotate the mixing paddle and a standard ST481 lift pump, was
used to mix and deliver the grout. |
The system gave full encapsulation
of the Gripforce ® tubes and
filled any internal voids and breaks within the harbour wall.
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Download the Printable PDF Brochure
If you would like to print the brochure for more information
on our grout pumping systems and drilling products 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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3.5 meg |
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Bar
& 'AT' Rockbolts
