ATTcolumn MethodSteel pipe pile method with high friction blade

About The ATTcolumn Method

The ATTcolumn Method is a synthetic steel pipe pile method with large frictional force and high toughness in which a steel pipe pile with blades is embedded in a columnar improvement. In the construction field, the ATTcolumn has received Ministerial certification (indentation bearing capacity) and has been rated by the Center for Better Living (withdrawal bearing capacity). In the civil engineering field, the ATTcolumn has undergone technical evaluation by the Japan Society of Civil Engineers, and can be applied to architecture and civil engineering structures.


  1. Achieves high peripheral frictional force.By integrating the Tenocolumn, which stirs in-situ soil without disturbing the soil on the side of the improvement, and a steel pipe pile with blades, a larger circumferential friction force can be obtained compared to other methods.
  2. Achieves high horizontal bearing capacity.Due to the improvement effect caused by horizontal force, the range of soil movement is expanded and the horizontal resistance is increased. The horizontal soil reaction force coefficient of the ATTcolumn can be four times that of the Tenocolumn method when calculating the amount of displacement, and fifteen times that of the Tenocolumn method when calculating the bending moment.
  3. Environmentally-friendly method.The large bearing capacity makes it possible to reduce the number of piles. Also, when used in conjunction with the low soil discharge Tenocolumn method, it is possible to reduce the amount of construction waste soil left onsite. In addition, this method emits very little vibration and noise.
  4. Enables construction in narrow spaces.The ATTcolumn can be used with construction equipment of various sizes. Tenox has an extensive construction record under conditions which make it impossible to secure a sufficient work area; for example, detached houses, steel towers, and seismic reinforcement.

Construction Methods

Pile Method

Ground improvement method