Reinforcement and liquefaction measures directly beneath structures, seismic retrofitting of foundations using the "Expacca Method."
A rapid infiltration injection method that allows for injection at a wide injection interval (2 to 4 m) with a large discharge rate (20 to 30 ℓ/min).
The Expakka method is an abbreviation for the Expand Packer method. This method allows for the formation of a soil packer larger than the drilling diameter by expanding a geo-bag in the ground, thereby securing a large columnar permeation source between the upper and lower soil packers. This enables a larger spacing between drill holes and allows for extensive injection through low-pressure permeation between soil particles with a large discharge volume. [Applications] ● Reinforcement and liquefaction countermeasures directly beneath structures ● Seismic strengthening of foundations ● Base improvement associated with excavation work ● Construction of impermeable walls for tank foundations ● Prevention of suction and reinforcement of riverbanks ● Reinforcement associated with tunnel excavation work ● Reinforcement of missing sections of underground diaphragm walls
