Raising and Lowering
Raising is necessary where parts or the whole of a building structure have tilted. To do this, segment piles are first press-driven under the foundations. These form a thrust block for the lifting process.
When all the piles have been inserted, hydraulic cylinders are placed between the pile head and foundation and very precise path sensors placed in position. Both are integrated into blocks for every eight lifting points. The blocks are connected to a control unit. The control unit is operated from a laptop computer and the raising of the building, or part thereof, is brought about safely and with precision. The lowering of building structure elements is, in principle, also possible.
As a rule, raising with the ERKA Pfahl system is implemented in conjunction with retrospective foundation laying. However, one can also raise or lower above the cellar or floor invert of a building. In doing so, jacking recesses are created in the existing masonry into which the lifting cylinders are positioned.
The remaining procedure is essentially as for raising and lowering a tilted structure. In this case, though, the lifting cylinders are extended or retracted synchronously.