Carnwath Road shaft – base slab pour
Five weeks after completing Kirtling Street shaft base slab pour, the Camfaud Special Projects team was back at the bottom of a 50 metre deep shaft, this time at Carnwath Road, repeating the exercise. Our customer at Carnwath Road was BMB jv; BAM Nuttall, Morgan Sindall and Balfour Beatty, and the concrete was supplied by Hanson Concrete.
The Carnwath Road shaft is narrower than that at Kirtling Street and so there was slightly less concrete in the slab. However, in terms of resources needed to carry out the pour safely and successfully, it was very similar.
Camfaud supplied three concrete pumps, one placing boom, high pressure delivery pipeline and ancillary equipment. As with Kirtling Street, we provided two shifts of Thames Tideway inducted, CPCS qualified operators working round the clock over a full weekend to complete the pour.
Thames Tideway – Kirtling Street shaft plug pour
Thames Tideway has just published it’s August 2018 video update. It includes, at around the 3 mins 25 second mark, time-lapse footage of the Kirtling Street shaft base slab pour.
The pour, the biggest on the whole Tideway project, was carried out by Camfaud for the Tideway Central contractor Flo jv, a joint venture between Ferrovial and Laing O’Rourke. The concrete was supplied by London Concrete from their nearby Battersea plant.
Camfaud supplied three high pressure concrete pumps, three placing booms, pipeline and ancillary equipment to place approximately 3,350 cubic metres of concrete at the bottom of the 50 metre deep shaft. Two shifts of Camfaud operators worked round the clock for 60 hours to complete this concrete pumping marathon.
This pour follows on from the work that we did a few years ago on the Lee Tunnel project that was highlighted recently in the first episode of the BBC2 tv documentary The Five Billion Pound Super Sewer.
To view the video on YouTube click here
VolkerFitzpatrick is the principal contractor on the Ely Southern Bypass project. We are currently working as the concrete pump hire specialistsfor their subcontractor, Sword Construction. Here are some photos of one of our M42 boom pumps, placing concrete for the 300m long river bridge.
M42 pumping the first bridge pier on the Ely Southern Bypass project
Ely Southern Bypass project – placing concrete in the first bridge pier
Ely Southern Bypass project – filling the shutter
Wide-angle shot of the M42 pumping at the Ely Southern Bypass project
M63 setting up at Port of Tyne
A pioneering wind farm development off the coast of Blyth has reached a notable milestone, with the first turbine foundation making its journey up the River Tyne on route to its final destination.
The GBFs have been constructed at the Neptune dry dock over the past 12 months by BAM Nuttall and these structures will be floated down the river to the Port of Tyne, where extra ballast will be added ahead of their ‘tow-out’ to the offshore wind farm site. Camfaud is involved at the Port of Tyne, pumping the extra ballast to secure the bases on the seabed.
Gravity based foundation en route to Port of Tyne
The project will see five wind turbines with a total generating capacity of 41.5MW installed around 6.5km off the coast of Blyth. Once operational, they will generate enough low carbon electricity to power around 34,000 homes.
Concrete gravity based foundations (GBFs) form part of the project and are being installed using a new ‘float and submerge’ method – the first time this method has been used for offshore wind turbines. Designed and built by Royal BAM Group in the Neptune dry dock on the Tyne, the GBFs are being floated into position at sea and submerged onto the seabed to provide the support structures that act as the foundations for the installation of the wind turbines.
Five gravity based foundations ready for transit
Each GBF is made up of more than 1,800 m3 of concrete and weighs over 15,000 tonnes when fully installed on the seabed. The structures have a total height of around 60 metres from the base to the access platform.
Gravity based foundation leaving for the Blyth Offshore Demonstrator wind farm
As previously reported, Crossrail now has a Learning Legacy website dedicated to “the collation and dissemination of good practice, lessons learned and innovation from the Crossrail construction programme”. The material, consisting of case studies, technical papers, documents, templates and datasets, is being “shared for use by other major projects and is relevant to clients, corporates, and suppliers from main contractors to small and medium enterprises.”
Recently a technical paper was published on the Learning Legacy website about the design, detailing and construction of the Moorgate shaft base slab – a 1750 m3 pour carried out using Camfaud pumps.
Moorgate shaft base pour
The technical paper makes for fascinating reading, especially in regard to the pour preparations. As the paper concludes: “Careful planning of the concrete pour from reinforcement detailing through to road closures to give access to a constrained site in the heart of the City of London, the contingency measures for disrupted concrete supply and the control of concrete temperature led to the successful execution of what was at that time Crossrail’s largest concrete pour.”