Settlement correction work | Settlement cracks in the mat foundation addressed with SWS investigation and partial jacking.
Subsidance correction work
We will conduct pinpoint analysis of partial subsidence and cracks in the foundation using SWS investigation! We will rationally restore it through targeted jack adjustments and foundation reinforcement, eliminating waste.
This proposal is a settlement correction and structural reinforcement solution that effectively repairs partial settlement of the mat foundation and structural cracks without incurring excessive construction costs. By conducting a preliminary SWS (Screw Weight Insertion) test, we can pinpoint the specific soft layers or settlement areas causing the subsidence. By applying a "partial jack-up method" that selectively lifts and corrects only the necessary areas without jacking up the entire building, we minimize construction equipment and personnel, significantly reducing construction costs and time. Furthermore, for structural cracks in the foundation, we combine high-viscosity epoxy resin injection, carbon fiber sheet application, and additional foundation reinforcement to dramatically enhance the durability and toughness of the foundation structure beyond its original level. After jacking up, we will perform steel pipe pile insertion, pressure plate installation, and mortar filling to completely eliminate the risk of future subsidence recurrence. We provide a rational option that balances cost-effectiveness with reliable safety structures and the preservation of the building's asset value.
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basic information
The applicable target is wooden single-family houses (with cloth foundation structure). As part of the investigation specifications, SWS (screw weight penetration) tests and laser high-precision floor and perimeter measurements will be conducted. Small multi-stage hydraulic jacks (5t to 20t) and portable electric hydraulic pumps will be used for lifting equipment. For structural reinforcement specifications, epoxy resin injection materials, U-cut seal materials, and carbon fiber reinforcement sheets (such as the Ganko Oyaji method) will be adopted. For ground reinforcement specifications, STK small-diameter steel pipes (101.6mm to 139.8mm) and steel pressure-resistant plates (thickness of 12mm or more), as well as non-shrink mortar and air milk filling methods will be applied.
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Applications/Examples of results
It is ideal for renovation work on single-family homes where localized subsidence or cracking of the foundation has occurred, and there is a desire to repair efficiently and safely while keeping costs down. It is utilized in sites where the owner wants to avoid complete demolition or extensive work on the entire building, and for clients such as contractors and renovation companies who wish to resolve subsidence issues quickly within a limited budget while managing risks. It is widely implemented with the aim of simultaneously reinforcing the ground and the foundation structure, restoring the building's seismic performance, preventing further subsidence, and maintaining and preserving asset value over the long term.
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