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| Project
Title |
Flood Risk
Management - Reinforcement of Riverside Wall |
| Client |
Gilbert & Caswell |
| Main Contractor |
Brett Contractors |
| Sub Contractor |
Barcol Cutting Services
Ltd |
| Featured
Products |
Weldgrip Gripforce
® Injection tubes & Grout Pump System |
|
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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.
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.
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.
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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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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