Mobile Set of Rams

Projects

Basement Work

Lankelma CPT has recently had to carry out several basement ground investigations within the London area. With our specialised basement equipment we are able to work in headroom as low as 1.80 metres (6 foot).

The basement rig can get its reaction from concrete floors, walls or ceilings. On a job in January 2004 depths of up to 20 metres were reached through London gravels down into London clay. Our electrical rig keeps the sound down to a minimum and the basement tidy.

Push in instrumentation under an angle

One of the advantage of cpt rams are their versatility. We can make cpt's under any angle. Another use you can see on the accompanying photos is pushing in instrumentation under an angle. This makes otherwise awkward jobs relatively easy and mess free. We have carried out projects under buildings, railways, canals. Un unusual use was to survey the depth of the foundation of an old church by probing in a number of angles. In this case a detached set of rams is used using the hydraulics and counterweight of a truck. The detached set of rams can be used in all sorts of environments like cellars, tunnels and any place with limited access or headroom.

Going Underground

Lankelma has just completed a basement job showing that CPT’s can be carried out almost anywhere.

The job was carried out in the basement of an important building in central London. The basement had been extended beneath the road that passed outside the building. This extension had recently started to subside and cracks had formed in the walls and floor. A ground investigation was needed as a step to prevent any further subsidence.

There was a height restriction of less than 2.2m, with pipes and air-conditioning shafts that reduced the working height in even more places. Access to the basement was by foot only down a series of stairs.

Due to the restricted access, a drilling rig and a conventional CPT rig was ruled out. Lankelma’s basement rig was the best choice for the job. It can work in areas with only 1 metre of headroom. It is hand portable, so can therefore be carried to locations. It can get its reaction from either bolting down to a concrete floor, adding kentledge or pushing from the roof.

For this project, the rig was bolted to the floor. The CPT reached a depth of 18.3m penetrating through the Terrace Gravels and into the London Clay. The requirement was for only one CPT, but generally, for basement work, 2 to 3 tests can be carried out in a day. This was just another example of how versatile CPT’s are.

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