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Liquefaction countermeasure WIB method

Reduction of seismic forces and prevention of liquefaction! Constraining the soil inside the cell to suppress ground deformation and reduce seismic motion.

The "Liquefaction Countermeasure WIB Method" protects buildings from damage caused by earthquakes and liquefaction. The basic structure consists of replacement soil that acts as a seismic isolation layer, ground improvement piles that function as a damping layer, and support ground improvement piles that support the building foundation. The ground improvement piles in the damping layer are constructed in a cellular form, creating a strong and stable composite ground (non-liquefaction layer). Additionally, by increasing resistance through the combination of pile foundations and the WIB method, it is possible to reduce the number of piles or lower the grade of the piles, thereby rationalizing the design and contributing to cost reduction. 【Features】 ■ Ground improvement piles in the damping layer are constructed in a cellular form ■ Creates a strong and stable composite ground (non-liquefaction layer) ■ During an earthquake, the cellular ground improvement piles restrain the soil inside the cells ■ Suppresses ground distortion and reduces seismic motion ■ Since liquefaction does not occur inside the cells, it blocks the propagation of liquefied mud water below, preventing surface liquefaction *For more details, please refer to the PDF materials or feel free to contact us.

  • Ground foundation construction method
  • Ground improvement
  • Ground improvement materials

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[WIB Construction Method Case Study] Measures Against Machine Vibration in Manufacturing Plants

Improvement of the working environment! Introduction of a construction case where tire shred made of high-damping material was filled in the cell.

At Mitsui Sumitomo Construction in Ehime Prefecture, vibrations caused by machinery operation within the manufacturing plant were propagating to the adjacent office building (a four-story steel structure), resulting in significant vertical vibrations accompanied by a rumbling phenomenon on the 3rd and 4th floors, necessitating environmental improvements. As a countermeasure, a passage for transport vehicles was constructed between the manufacturing plant and the office building, and the 'WIB method' was implemented directly beneath it. Vibration measurements taken before and after the countermeasures showed a reduction of 10 dB on the 1st floor, while the rumbling phenomenon was eliminated on the 3rd and 4th floors, resulting in a reduction of 15 to 17 dB. Additionally, the vibration level, which had exceeded 70 dB before the countermeasures, dropped to below 60 dB afterward, improving the working environment. 【Case Summary】 ■ Location: Ehime Prefecture ■ Client: Mitsui Sumitomo Construction ■ Vibration Source: Factory vibrations ■ Target for Preservation: Adjacent office building ■ Countermeasure Method: Plate-type WIB (honeycomb cell type) ■ Installation Position: Vibration propagation route *For more details, please refer to the PDF document or feel free to contact us.

  • Ground foundation construction method
  • Ground improvement
  • Ground improvement materials

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