Shield Construction Field

“Liquid transport development materials," "solidification processing materials," and "water treatment materials (coagulants)" utilized when excavating areas below GL in shield construction.

Pressurized slurry shield method

Technica offers slurry stabilization materials primarily utilized for “mud film formation,” “slurry viscosity control,” and “suppression of lost circulation” in slurry shield methods where shield machine excavation is performed while preventing collapse of the ground subject to excavation by managing the slurry pressure so that the pressure is equivalent to ground-water pressure.

Pressurized mud shield method

Technica offers mud adding materials primarily utilized for the “plastic fluidity,” “cut-off performance,” “autonomy of excavated soil,” “pumpability of excavated soil,” and “non-separation (non-bridging effect) of soil and water” in the pressurized mud shield method where excavation is performed while suppressing collapse by directly controlling the shield machine in the ground subject to excavation.

Foam shield method

Technica offers foam materials primarily utilized for the “plastic fluidity,” “cut-off performance,” and “reduced excavated soil volume" in the foam shield method, which supports all soil qualities, such as gravel, sand, and clay, via the addition of special fine particles comprising a surface active agent as the main ingredient when introducing the ground subject to excavation into the shield machine chamber.

Water treatment of slurry and muddy water produced by shield excavation (coagulants)

Water treatment of slurry and muddy water produced by shield excavation (coagulants)Techica offers water treatment materials (coagulants) and PH adjusters primarily utilized in onsite wastewater treatment, etc., in relation to the general construction of pressurized mud shields, etc., when treating (performing secondary and tertiary treatment of) the surplus slurry generated by the pressurized slurry shield method.

Technica also offers original functional products born from our onsite participation in “raising the construction rate of operation,” “developing high-speed dehydration,” “enabling use with single liquid management,” and “enabling use with simple agitation," based on general JIS standard products.

Shield excavation soil solidification materials

Technica offers solidification materials primarily utilized when improving soil in order to satisfy the standards of target recycling indices when recycling target soil by shield excavation in cases where dump truck transportation is not possible due to the effects of retained water content in primary and secondary treated soil in relation to the pressurized slurry shield method, or in cases where dump truck transportation is not possible due to water content separation failure in the discharged soil excavated using the foam shield method or in the solidification treatment of the discharged soil excavated using the pressurized slurry shield method.

With the primary purposes of the above defined by the construction method used, the products are applicable to all soil textures and all excavated soil discharge.

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