ONE OF THE smallest, most mobile rigs in Lankelma's fleet made its debut in the basement of of an office development in Blackfriars, central London.
The new mobile CPT rig carried out eight, 20m deep tests on the week-long contract in January in the maze-like basement of the building. Two tests were needed outside.
Its 700mm stroke, instead of the usual 1m, means the rig can work in low headroom. Its stroke can even be lowered to 500mm.
It is also lighter. 'It's easier to handle. A larger machine would have needed three men, ' explained Lankelma geotechnical engineer Darren Ward. 'This meant it was easier to manoeuvre in the tight basement.'
The rig can be spilt and moved on a trolley. It uses a hydraulic power pack that plugs into the mains, as diesel power could cause fume problems in confined spaces, Ward said. The rig can be mounted on anything from a jackup platform to rail rolling stock.