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Chicago (Board) Construction

This construction method uses both manpower and machines for excavation while also constructing retaining walls using steel corrugated sheets and ring frames. The ground is excavated until a determined depth and then reinforcing rods are assembled inside the underground shaft. The retaining material is then removed while concrete is poured in to construct the shaft.

Chicago (Board) Construction


  • Can be used in narrow sites and on sloping ground, as well as from excavated surfaces
  • Enables large-caliber excavation and expansion of the base area.
  • Enables excavation of even extremely hard ground such as rock supporting layers.
  • Can directly observe and confirm the supporting soil

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