While London whiles away the weekends, Camfaud is at work repairing the capital’s infrastructure.
Our most recent job involved pumping rapid setting concrete underground to form a tunnel trackbed. Our “troglodyte team” manned the pumps (and the pipelines!) round the clock to enable the concrete to be placed as soon as the track was aligned and the slab ready to be poured.
It is usual, when pumping long pipelines, to use 125mm pipeline. However, for this contract, 100mm pipeline was preferred in order to increase the velocity of the material through the line and thus minimise the chance of the rapid setting mix going off in the pipes.
We recently pumped approximately 5,000 cubic metres of concrete into the basement of One Nine Elms, a mixed-use skyscraper development in South West London. Camfaud supplied four pumps, two Putzmeister pumps and two Schwing pumps for the pour. We also supplied backup pumps though, in the event, these were not required to work.
The pour, was carried out for Careys Civil Engineering. It lasted nearly 36 hours and finished on Sunday 17th March, allowing the Irish contingent a double celebration on St Patrick’s Day.
London Concrete supplied the concrete, a 75% GGBS 25% cement mix. It was their second largest continuous pour after the 5,500 cubic metre pour they carried out in 2009 at the Shard. The success of the pour was highlighted in an article in The Construction Index.
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 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