Client
CVB JV
Duration
6.5 months
Location
Greenwich London
Project Type
Design & delivery of a watertight secondary lining for the GREPS shaft, internal walls, Base slab and ‘benching’
Internal Shaft Diameter
17.050m
Lining wall Length
53.5 linear meters with wall thickness between 700mm to 2.2m
Internal walls Length
24 linear meters 1m wide
Shaft Height
47m
Internal wall Height
up to 26m
Slipform Engineering provided our client, CVB, valued engineering solutions to meet their requirements. This was achieved through close collaboration, design and construction of temporary works structures and slipforming technologies to deliver a 17.05m diameter, 47m deep watertight secondary lining for the GREPS Shaft, forming part of the Thames Tideway development project. Slipform Engineering also built the Internal/Dividing walls, 1m wide and upto 26m high using slipforming system.
3700m3 of concrete & 700t reinforcement were used for the build.
Shaft lining walls were constructed in 15 days & nights, an average of 3.2m per 24h shift, while internals walls 3 days and 3 24h shifts averaging 2.9m per 12h shift.
Secondary lining included encased in concrete stainless steel Vortex tube 3.2m dia, 31m high and 5.14m dia Portal Eye including all the temporary works.
The whole rig was designed to be suspended from 18 strand jacks and were supported on a bespoke grillage structure, which was designed to allow large pre-fabricated elements to be installed without any time loss within the construction programme.
2 adaptions were required to complete both, lining and internal walls.