Reinforcement and liquefaction measures directly beneath structures, seismic retrofitting of foundations using the "Expacca Method."

basic information

【Features】 Injection can be performed at a wide injection spacing (2 to 4 m) with a large discharge rate (20 to 30 liters/min). The number of drilling holes per unit of improved soil volume is small, resulting in shorter injection times. A reliable columnar permeation source is secured, and due to its large size, the permeation rate per unit permeation area is small, allowing for low-pressure permeation injection. The dedicated injection material "Permalock ASF Series" enables continuous injection for several hours and forms a permanent improved ground with a strength of 0.1 to 0.2 MN/m². The dedicated injection material "Hybrid Silica" forms a high-strength improved ground with a strength of 3.0 to 5.0 MN/m². 【Construction Procedure】 1. After erecting the injection outer pipe, expand the geobag to construct the columnar permeation source. 2. The geopack grout filled inside the geobag partially permeates, alkalizing the surrounding ground (soil packer). 3. The soil packer prevents leaks along the injection pipe. 4. Low-pressure injection is possible even with large discharge due to the large columnar permeation source.

Price range

Delivery Time

Applications/Examples of results

[Applications] ● Reinforcement and liquefaction countermeasures directly beneath structures ● Seismic strengthening of foundations ● Improvement of the base due to excavation work ● Construction of a waterproof wall for tank foundations ● Prevention of erosion and reinforcement of riverbanks ● Reinforcement associated with tunnel excavation work ● Reinforcement of missing sections of underground diaphragm walls