A range of environmentally friendly soil conditioners for different soil types and water conditions designed to reduce wear and improve the performance of EPB TBMs.
TBM Soil Conditioning Foams
Standard and polymerised soil conditioners are normally used for silty to gravelly sands. Different foam types may be used depending on the nature of the soil and its humidity or the groundwater pressure.
Anti-clogging agents are used for clay and clayey soils that significantly reduce clogging and re-agglomeration effects. Due to the complex nature of clay and clayey soils, different clay formations also require different anti-clay agents.
Soil Conditioning Polymers
Polymers are generally used when tunnelling through water-bearing grounds, where the excavated soil becomes very liquid and difficult for the screw conveyor and conveyor belt to handle
Tail Seal Grease
Normet offers a range of tail seal greases for shielded TBM use that cover first fill, high performance and economic driving grade applications. First fill grade tail seal grease is pumped into the wire brushes before the TBM starts up. Once applied inside the brushes, the first fill grade protects them against wear, water soil and annulus grout ingress while keeping the brushes highly flexible for protect long-term sealing. Driving grade tail seal grease is pumped into the sealant chambers as the TBM advances.
Normet have a complete range of annulus grout admixtures to suit all TBM backfill annulus grouting applications, together with experts in the field to support you all the way. Efficient and trouble-free annulus grouting is essential to maximise TBM uptime, reduce settlement risk, fully embed the lining to transmit forces around the ring and, last but not least, protect the lining and gaskets. Normet can provide guidance and support to reduce the learning curve and build confidence in the team.
Anti-dust & Anti-Wear Additives
Normet TBM anti-dust and anti-wear agents are designed to significantly reduce disc cutter wear, temperatures, cutter blockages and dust levels.
TBM Main Bearing Grease
TBM main bearing grease effectively protects the TBM main bearings by preventing the ingress of soil, water or dust through the main bearing seals. Normet’s main bearing sealing and lubricating greases are carefully designed for exactly this purpose. Normet TBM main bearing greases combine good adhesion and cohesion properties with excellent lubrication properties. They prevent ingress of soil and water.