To support safe and stable shield tunnel construction, TAC provides optimal materials for six key construction methods.
Backfill grout injection is a construction method used to promptly fill the voids, called tail voids, that are generated during shield tunneling. By integrating the segments with the surrounding ground, it helps suppress ground settlement and ensures the stability of nearby structures.
Additive injection is a construction method used in earth pressure shield tunneling. By mixing and agitating additives with the excavated ground, the soil is plasticized (converted into conditioned muck), improving the stability of the tunnel face and enhancing water-tightness. By selecting the appropriate type and concentration of additives, the method can be adapted to a wide range of ground conditions.
Clay Shock is a method that uses "Clay Shock," a high-viscosity, non-hardening injection material, to reduce friction around the shield during excavation and achieve high stability even in sharp curves or during stoppages. With its excellent void-filling performance, it is also effective as an alternative to conventional ground improvement.
This method uses "air mortar," a lightweight, highly flowable injection material, for backfilling inside shield tunnels and filling voids. The FLOW-TAC method developed by TAC offers excellent bubble stability, enabling long-distance pumping and flexible adjustment of strength.
In slurry shield tunneling, quality control of the slurry is critical for maintaining face stability and preventing loss of slurry. TAC supplies multiple slurry materials, including clay and bentonite, to support stable excavation.
The treatment of muck and slurry generated during excavation is a critical issue due to its potential environmental impact. TAC uses muck solidification agents that stabilize and solidify sludge-like spoil, as well as TG Squall, a water treatment agent that meets environmental standards, to improve workability while reducing environmental load.
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