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TBM’s Tunnel Boring Machines

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TBM’s Machines

Nepal has been digging tunnels using the conventional drill and blast since 1950s. The D&B method is a standard method to dig tunnels not only in Nepal but worldwide. However, in the recent past the use of mechanized tunneling methods using Tunnel Boring Machine (TBMs) are becoming increasingly popular methods to dig tunnels of longer lengths. Nepal used its first TBM in 2015 to dig the tunnel for Bheri Babai Diversion Multipurpose Project. The TBM manufactured by Robbins-A global TBM Company and supplied through MMSM to the contractor appointed by Department of irrigation (DoI), Nepal was successful in completing the tunnel boring of 12.3 KMs of tunnel in just 17 months. This could have taken more than 10 years if dug through Drill & Blast method. 

Similarly, the second TBM project in Nepal Sunkoshi Marine Diversion Multipurpose Project under the same department opted to dig its 13.3 KM tunnel using the TBM manufactured and redesigned by Robbins. The tunnel was completed in 19 months about 7 months ahead of schedule.  

These successes have proven the worth of TBM’s in Nepal. Now more and more contractors and Developers are exploring the option of using TBMs for their tunnels. The initial capital investment in this method creates a doubt among the tunneler, however it has been seen globally and in Nepal that the significant time saved by using the machine, completely justifies the initial investment. Any tunnels longer than 7km is worth digging using a Tunnel Boring machine.

 

TBM offerings

4. Crossover Machines

Crossover TBMs are versatile tunneling machines designed to seamlessly transition between different tunneling methods, such as Earth Pressure Balance (EPB) and Open Face. These innovative machines are engineered to handle various geological conditions, making them ideal for complex projects that require adaptability. With their advanced technology, Crossover TBMs optimize excavation efficiency while maintaining safety and stability. Discover how these machines enhance tunneling operations by providing flexibility and precision in challenging environments, ensuring successful project completion.

For the most difficult projects, Robbins Crossover TBMs can offer time-saving and efficient tunneling.  Whether the hybrid design converts between EPB and hard rock modes, between Slurry and hard rock, or between EPB and Slurry is up to you.  From heavy duty screw conveyors that handle rock to interchangeable cutting tools, Robbins Crossover TBMs are designed to cross between ground conditions that would typically require multiple machines.

What is a Crossover TBM?

A Crossover TBM (Tunnel Boring Machine) is a specialized type of tunneling equipment designed to handle a variety of geological conditions, including both hard rock and soft ground. The Robbins XRE TBM is a prime example of a Crossover TBM, as it incorporates design elements from both Earth Pressure Balance (EPB) machines and hard rock Single Shield machines.

Crossover Slurry/EPB (XSE) TBMs are cutting-edge tunneling machines designed to tackle a wide range of geological conditions by seamlessly switching between slurry and Earth Pressure Balance (EPB) modes. This versatility allows for efficient excavation in both soft ground and mixed-face environments while maintaining optimal soil pressure to prevent surface settlement. Equipped with advanced technology, XSE TBMs enhance operational efficiency and safety, making them ideal for complex urban tunneling projects. Discover how Crossover Slurry/EPB TBMs revolutionize underground construction by providing flexibility and precision in the most challenging conditions.

Key Features of a Crossover TBM:

  • Versatility: The XRE TBM can efficiently excavate through diverse ground conditions, such as abrasive basalt, watery clays, and mixed geology, making it suitable for projects where the geology may change frequently.

  • Custom Engineering: Each Crossover TBM is custom-engineered to meet the specific requirements of a project, allowing for optimal performance based on the anticipated ground conditions.

  • Switching Mechanism: The XRE TBM is equipped with features that enable it to switch between pressurized EPB mode (using a screw conveyor for muck removal) and non-pressurized rock mode (using a belt conveyor) within a few days. This adaptability is crucial for maintaining efficiency when encountering varying ground types.

  • Interchangeable Cutterhead: The cutterhead of the XRE TBM is designed to allow for interchangeable cutting tools, enabling operators to switch between tungsten carbide bits for soft ground and disc cutters for hard rock.

  • Advanced Technology: Crossover TBMs come with various advanced features, including high-pressure seals to prevent water inflow, multi-speed gearboxes for navigating challenging ground, and automatic guidance systems for precise tunneling operations.

  • Field-Proven Performance: Crossover TBMs have been successfully utilized in various challenging environments, demonstrating their ability to lower risks and facilitate difficult excavations when accurate geological information is available.

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” Did you know: The Crossover XSE is the most versatile type of TBM? It can be fully customized with both EPB and Slurry TBM features to excavate in nearly all ground conditions.”

MMSMC