PRODUCTS

World Largest Class TBM

⌀17.45m EPB TBM

⌀17.45m Earth Pressure Balanced TBM
Completion of factory assembly
Group photo in front of the TBM
Φ17.45m TBM Completion of excavation
Completion of excavation

Project outline

Construction nameState Highway 99 Tunnel Construction
Construction siteSeattle, Washington, USA
Owner nameWashington State Department of Transportation / WSDOT
Contractor nameSeattle Tunnel Partners (Dragados USA, Tutor Perini JV)
Features of construction
  • Tunnel length: 2,856m
  • Minimum curve radius: 1,800m
  • Gradient: -4% ~ + 4%
  • Maximum overburden: 65.2m
  • Design earth pressure: 4.3bar Tunnel center
Segment
  • Type: Reinforced concrete segment
  • Outer diameter: 17,069mm
  • Inner diameter: 15,850mm
  • Width:1,980mm
  • Number of ring pieces: 10
  • Maximum mass of 1 piece: Approx. 17ton
Machine design conditions
  • Design pressure: Maximum 7bar (10bar in emergency)
  • Excavation speed: 60mm / min
  • Segment assembly time: 30min / ring

Tunnel outline

Completion image

Completion image

Tunnel route

Tunnel route MAP
Tunnel route photo

Soil profile

Soil profile

Main specifications

TBM typeEPB TBM
TBM outer diameter⌀17,450mm
Tail plate thickness140mm
Shield jack propulsion speedMaximum 80mm / min
Total thrust force392,000kN (Unit area thrust: 1,639kN / m2)
Cutter drive torqueRated 147,400kN-m
Cutter speedMaximum 1.8min-1
Cutter drive total power13,440kW
Machine total power23,000kW

TBM main components

Back-up equipment

Double arm erector

Double arm erector

Back-up equipment

Back-up equipment

Pictures of factory assembly

Pictures of factory assembly1
Pictures of factory assembly2

Introduction of EPB TBM

Inquiries about Products