Case Study Overview
The foundation steelwork was designed and fabricated to form a sub base for the reinforced concrete box that would form part of the tower foundation. Rebar was then fixed to the steelwork prior to the shuttering being assembled. Once the concrete was cured the 60t box was transported to site by barge and lifted onto the 4 piles in Victoria dock. When in position the modular cofferdam was bolted together and joined to the concrete box.
This allowed divers to grout the joint between the steelwork sub base and piles prior to the water be pumped out to allow the rebar for the foundation to be assembled and mass poured with concrete. Once complete the modular cofferdam was removed piece by piece using operatives working from boats.
At a glance
- Description: Fabrication of modular cofferdam for North tower foundation, fabrication of foundation steelwork for London cable car.
- Location: Ipswich and Northfleet R7M fabrication facility. On site, Victoria dock, London
- Companies Role: Fabrication contractor responsible for all health & safety planning and fabrication work. On site installation.
- Programme Duration: 3 week fabrication programme completed on time
Modular cofferdam designed by R7M personnel. All fabrication and welding works by R7M personnel.
Calculations package by structural engineers. Concreting and formwork by sub contractors.
The fabrication of the modular cofferdam was designed so that it could be removed without the need to use divers thus offering a cost and time benefit to the works program.
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