Since then, the process has been applied to a wide variety of soil improvement works. As well as the reinforcement of railway platforms, the process was used for ground improvement works under paving, concrete slabs and footings, embankment stabilisation and in-situ soil remediation.
Like other soil-mixing elements, Springsol® columns behave as semi-rigid inclusions, stiffer than the non-treated soil, but softer and less rigid than concrete.
Depending on the presence of existing elements (paving, foundations, rocks, etc.), the soil is can be treated only at depth or directly from the surface. To do this, two types of tools can be used:
Easy and versatile soil reinforcement technique
Minimum requirement in terms of equipment (small diameter drilling rig and compact grout production plant)
Limited risk of disruption (very low risk of settling or lifting)
No generation of vibrations
Guaranteed column dimensions
Can be used with limited headroom and/or in confined spaces
When using an opening tool, the Springsol® process includes five phases:
When used with a fixed tool, the Springsol® process simply involves low-pressure incorporation of grout and mixing during drilling, along with further mixing during extraction.
Completion of 600m3 of soil treatment using sub-horizontal Springsol® columns to minimise settlement during the excavation of a transfer corridor beneath the slab of the existing station.