Deep Trenching - Deep drainage

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Installation of Deep drainage for accelerated consolidation of soft ground conditions

In the past high, quality preparation of sites on soft soils was an intensive, time-consuming and expensive undertaking.  The new patented IFCO method means that all or part of site preparation can now take place at a high speed, with a minimum of residual settlement and without loss of stability.  With the IFCO method existing techniques are combined, which together ensure significant savings in time and therefore in costs
IFCO is the abbreviation for Intensive Forcing Consolidation of the Subsoil, a method which makes use of horizontal deep drainage and partial vacuum. Conventional methods make use of pre-loading (sand), possibly combined with vertical drainage, which accelerates consolidation of the subsoil to some extent.  This preparatory process may take years, whereas the IFCO method yields a time saving of up to 80%.  With the IFCO method a deep drainage trencher digs a horizontal drain to 6-7 metres below ground level and the trench is then filled with sand. This creates vertical sand screens on the site, with a drain at the bottom.  A pump is installed in each drain for water removal so as to lower the groundwater level.  The groundwater then flows horizontally to the permeable sand screens and is discharged via the drains.

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