DUAL MODE TBM (CROSSOVER)
The Ultimate Versatility for Highly Variable and Complex Ground Conditions
The Dual Mode TBM (also known as a Crossover Machine), manufactured by Sunward Machine, represents the highest level of geological adaptability in tunneling. Designed specifically for projects that encounter rapid and unpredictable shifts between hard rock, soft ground, high water pressure, and mixed face conditions, this single machine can quickly convert its operational system to maintain face stability and advance rate. This versatility eliminates the need for multiple specialized TBMs, offering significant time and cost savings.
Core Conversion Capabilities
- EPB Mode
(Soft/Cohesive Ground)
Operates as an Earth Pressure Balance machine, using the conditioned excavated material via a screw conveyor to actively support the face pressure, ideal for clay and soft soils. - Slurry Mode
(Water-Rich/Permeable Ground)
Switches to Slurry Pressure Balance operation, using pressurized bentonite slurry for precise pressure control in high permeability soils or high hydrostatic pressure environments. - Open Mode
(Stable Hard Rock)
In stable hard rock sections, the machine can switch to non-pressurized Open Mode, removing muck via a belt conveyor for high-speed intermittent advance.
Key Advantages: Risk Mitigation and Efficiency
Mitigating Geological Uncertainty
Significantly reduces the risk of encountering unexpected ground conditions by being able to switch operating principles.
Cost and Time Efficiency
Avoids the considerable cost and downtime associated with machine dismantling, removal, and reassembly when changing between EPB and Slurry TBMs.
Typical Applications (Variable Ground)
- ✓Long tunnels crossing through sections of sand, clay, and mixed face rock.
- ✓Projects with high potential for unexpected water inflows or high hydrostatic pressure.
- ✓Urban infrastructure where minimal surface settlement and high safety standards are mandatory.
Technical Structure Highlights
The design integrates a multi-chamber pressure bulkhead and interchangeable cutting tools to ensure robust performance across the different modes.
Cutterhead Versatility: Combination of disc cutters and cutting bits on one multi-mode cutterhead.
Muck Removal System: Capability to convert between screw conveyor (EPB) and slurry circulation (SPB)systems.
Interested in Dual Mode TBM Solutions?
Contact Sunward Machine today for customized TBM selection and project consulting.
