TBM Cutter floatings Seal is METAL SEALING RING
The floating sealing technology adopts the most advanced metal sealing technologies, a pair of elaborately designed and machined metal sealing elements ser.,e as the拟ial dynamic sealing, which reduces 70%-80% of sealing surtace friction, besides that, two high elastic and high-temperature resistance high saturated nitrile rubber functional rings are applied to be the static sealing, the optimized sealing compression are selected to ensure the ideal initial contact of two metal ring sealing surfaces
Solutions are required to seal and fill the annular void between the TBM or Tunnel Rings, and Launch/Exit chamber to manage risk, allow TBM pressurisation, and to form a stop-end to enable after-grouting of the tunnel annulus.
The narrow void to be sealed is difficult to access, and seal systems need to be robust and reliable for pre-fixing and remote filling without access. Sealing must be completed before the TBM is launched, making reliability critical to avoid delays.
Seals which make reliable full contact to completely fill the void are preferred to manage the risk of TBM face pressurisation and to limit water ingress or after-grouting leakage.
TBM Cutter floatings Seal performance：
Surtace hardness of metal sealing ring: HRCS0-62
Smoothness of working surtace: 0.0018mm
Leakage rate of sealing surtace: 0.01 mllh
The roughness of internal surface Ra2.5-5.0
