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Gantetsu Pile (Steel-Pipe Soil-Cement Composite Pile)

Gantetsu Pile is a "steel-pipe soil-cement composite pile" which consists of a steel pipe with outer ribs and a solid body (soil cement column) which is formed by boring a hole in the ground, injecting cement milk, and mixing and stirring it in situ. The Gantetsu Pile construction method was developed as a "piling construction method with minimal soil removal" with the aim of helping to reduce excavation of soil from construction sites. The construction method, which realizes both high bearing capacity and environmental protection, has been highly rated and is included in the Japan Road Association's Specifications for Highway Bridges as "steel-pipe soil-cement composite pile."

Applications

  • Bridge foundations
  • Building foundations
  • Other foundation piles

Advantages

High Bearing Capacity and Low Cost
Because the Gantetsu Pile is a composite pile composed of a steel pipe with outer ribs and a soil cement column solidified with the pipe as one integral body, the diameter of the integral solid body (pile diameter) to support the load it has to bear is 200-400 mm larger than that of the steel pipe. This results in a high bearing capacity, which can reduce the number of piles needed and the total construction cost.
High Structural Reliability
Because piles installed using this construction method, which does not cause loosening of the ground, have high stability in skin friction and end bearing capacities, the Gantetsu Pile construction method is also highly applicable as a friction piling technique. Steel pipes are used as stress materials, so the construction method demonstrates high toughness against large deformation in the event of massive earthquake.
Environmental Protection
・Less excavated soil
By making it possible to construct a composite pile by pouring cement milk directly into a hole in the natural ground and mixing and stirring it there, this construction method can minimize the amount of excavated soil left over from piling work. Furthermore, thanks to the high bearing capacity, fewer piles may be required and footings may be smaller, which can significantly reduce the volume of excavated soil left over from construction works.
・Low noise and vibration
Because the steel pipe is pressed-in using rotation before the soil cement column solidifies in the natural ground, piling with this construction method causes less noise and vibration.
High Quality and High Construction Efficiency
A stirring tool equipped with free blades and a stabilizer can make a solid body of high quality. With an original construction management system which enables constructors to check the status data (depth, excavation resistance, and bearing stratum) while working, piling work with high reliability and efficiency is realized.

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