The columnar ground improvement technology "SST method," which enables powerful compaction in the horizontal direction, achieves overwhelming high strength, high load-bearing capacity, and cost reduction.
The SST method is based on the principle of "eliminating voids and water between soil particles to increase density and strength." Unlike conventional in-situ mixing methods, it involves excavating soil and discharging it above ground, where solidifying agents and additional sand are mixed to "combine particles of different diameters." This improved soil is then filled into the excavation hole while being "compressed and compacted with strong force" using a newly developed auger, which binds soil particles together with needle-like crystals of the solidifying agent to construct a robust column. Since the construction is visually monitored on-site, it ensures a uniform and continuous high quality. Additionally, the method allows for powerful compaction not only in the vertical direction but also horizontally, enabling the construction of columns that exhibit high strength and bearing capacity of 2,400 kN/m² as per design standards. Furthermore, the surrounding ground is also compacted strongly, significantly enhancing the overall bearing capacity of the foundation. As a result, the number of columns can be reduced, and since very little excavated soil is generated, the use of large construction machinery, water, and electricity is minimized, greatly improving the applicability and workability on-site and reducing costs. Moreover, due to the immediate development of considerable strength from compaction, the curing period for the solidifying agent is almost unnecessary, leading to a shortened construction period.
Inquire About This Product
basic information
◆Column design diameters: 400mm, 500mm, 600mm, 700mm ◆Maximum improvement depth: 12m ◆Applicable soil types: sandy soil, clayey soil, loam, organic soil (including highly organic soil and humus soil) ◆Design standard strength: 700~2,400kN/m2 depending on soil type ◆Applicable long-term bearing capacity (per column): 120~300kN or less depending on the column design diameter ◆Construction equipment: SST auger, hole-digging pile driver (3~6t), hydraulic excavator (0.06m3), no plant equipment required ◆Construction space, etc.: Work space of 4m✕10m or more and an access road of approximately 2.5m or more
Price range
Delivery Time
Applications/Examples of results
◆Ground improvement work for general architectural structures below mid-level and civil engineering structures such as retaining walls and box culverts. ◆Construction achievements include over 1,700 projects from April 2006 to June 2020. ◆The maximum building height is an 11-story reinforced concrete apartment building constructed in Tokyo. ◆The largest area is approximately 300,000 m2 for a factory constructed in Niigata Prefecture.
catalog（1）
Download All Catalogs
Company information
SST Association Co., Ltd. has developed the "SST (Soil Squeeze Technology) method" for columnar ground improvement technology and is engaged in ground improvement projects using this technology. In response to societal needs such as reducing environmental impact and addressing natural disasters, we continue research and development to further evolve the SST method's technology. We are also working to expand the agency network for the SST method and to promote the expansion of ground improvement projects using the SST method, ensuring that its effects can be fully realized to contribute to society.