Settlement correction work | Fundamentally solve the settlement of buried waste materials and complex strata with steel pipe piles!
Subsidance correction work
Eliminate foundation settlement caused by debris, buried waste, and uneven strata! A correction technique that prevents re-settlement by fixing to a hard support layer through the pressing of steel pipe piles due to the weight of the building.
The presence of buried waste and rubble, as well as irregular old embankment layers, which cannot be identified solely from the data of the ground survey conducted in advance, can be significant causes of localized settlement and diagonal cracks in the footing foundation. Such geological factors leading to uneven settlement cannot be prevented by simple surface ground improvement. Geotech's settlement correction work accurately identifies the causes based on excavation verification at the site and applies a steel pipe pile driving method that utilizes the building's own weight as a reaction force. Small-diameter steel pipes are pushed in with hydraulic jacks, penetrating the surface obstruction layers to firmly reach the hard supporting ground below. The irregularly settled footing foundation is safely jacked up and accurately returned to a level position, while cracked concrete foundations are repaired by injecting high-adhesion epoxy resin. Voids created by settlement under the floor and gaps around buried objects are filled with high-density air-entrained mortar to improve bearing capacity from the bottom up. The work can be completed in a short period while the residents remain in the building, fundamentally resolving the issues of irregular settlement.
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basic information
This construction method uses carbon steel pipes that conform to the JIS G3444 STK400 standard (outer diameter 114.3 mm to 165.2 mm, wall thickness of 4.5 mm or more). The weight of the building is used as a reaction force to press-fit the steel pipes with a small hydraulic jack, breaking through the surface debris and foreign material layers to secure them into a deep supporting ground with a calculated N value of 10 or more. High-permeability epoxy resin mortar is applied to the cracked areas of the foundation, and a highly fluid air-entrained mortar (air milk) is filled into the voids and subsided areas underground. The pressure input and supporting force during construction are strictly managed and fixed.
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Applications/Examples of results
It is utilized for correcting local subsidence of wooden and steel-framed houses standing on uneven ground where old landfills and buried waste materials are suspected, as well as where valleys and embankments intersect. It is ideal for identifying causes and reinforcement work at sites where preliminary survey data differs from actual subsidence behavior. It is widely applicable for subsidence restoration of occupied homes, foundation crack repairs for apartments where demolition is to be avoided, and foundation renovation work aimed at simultaneously achieving backfilling of underground voids and preventing future differential settlement.
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