Double Shield Tunnel Boring Machine

High-Efficiency Double Shield TBM

This double shield Tunnel Boring Machine (TBM) is engineered for fast and safe tunneling in both stable and unstable rock conditions. By integrating the functions of open-type gripper and single shield TBMs, it allows for simultaneous excavation and segment installation in stable geology, significantly increasing project speed. It is an ideal solution for boring long tunnels in hard rock, offering versatility through its dual-mode operation for fractured or weak ground.

Operational Modes

• Stable Rock Mode: Simultaneous excavation and segment installation using gripper shoes.
• Fracture Zone Mode: Retracted telescopic shield acting as a single shield TBM.
• Auxiliary Thrust: Advances by pushing against segment rings in weak ground.

Key Technical Features

• Advanced drilling system for real-time geologic mapping.
• High wear-resistant cutterhead made of Hardox or composite chromium-carbide plates.
• Double row cylindrical roller thrust bearings for long service life.
• PLC control system for real-time monitoring and data collection.
• Innovative transport system for segments and construction consumables.
• Modular shield structure for easy in-situ assembly and disassembly.

Excavation Diameters

Project Track Record

Primary Applications