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Getting the London underground back on track

In May 2016, Camfaud Concrete Pumps Ltd supplied pumps and staff for London Underground’s Liverpool Str... READ MORE

Getting the London underground back on track

In May 2016, Camfaud Concrete Pumps Ltd supplied pumps and staff for London Underground’s Liverpool Street Diamond Crossover Renewal.

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In May 2016, Camfaud Concrete Pumps Ltd supplied pumps and staff for London Undergrounds  Liverpool Street Diamond Crossover Renewal.

At over 60 years old, the tracks of the Liverpool Street Diamond Crossover was due for a full renewal. The project involved removing over 400 tonnes of rubble and pumping over 300 cubic meters of concrete from street level. Completion of the project required extensive collaboration between a number of stakeholders including Transport for London (TfL), Track Partnership, Broadgate Estates, the City of London Corporation, Hanson Concrete and Camfaud Concrete Pumps.

 

Two Putzmeister BSA 1409 D4 stationary pumps were tasked with the job. The pumps fed separate pipelines to supply concrete to two concreting teams working in parallel in each of the tunnels and the cavern. Track Partnership were extremely careful to protect the environment in this sensitive area with polypropylene sheeting, geotextile fabric, rubber mats, plywood sheets, bubble wrap and drip trays all being used.

 

 

This operation was completed in two stages. First the two parallel chambers in the cavern beneath the track had to be filled - each with a volume of approximately 105 cubic meters. Next, the track bed had to be poured, embedding the sleepers into the concrete slab. The entire concreting process including lubricating the pipelines, pumping the concrete into the chambers and track slab and cleaning out the pipeline and pumps, took 12 hours to complete.

 

Thanks to efficient planning and first class teamwork between all project partners the concrete pumping operation was completed ahead of schedule, giving Track Partnership more time to complete their work prior to handing the Central line back to Transport for London.

 

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