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The open-type tunnel boring machine (TBM) is primarily employed in hard rock tunneling environments characterized by high geological stability and limited fracture zones.
⚙️ Description of Hard Rock Open-Type Gripper TBM
The open-type tunnel boring machine’s built with all the key parts—cutter head, drive gear, shield, the saddle, frame, spreader, and back support. It's been reliable on site.
What makes this one stand out is that NHI put together the core systems in-house. The main bearing is larger than usual, which helps keep it stable even when the load gets heavy. The arch assembly apparatus is designed for operational versatility across varying tunnel profiles. Propulsion is stabilized through a centering mechanism utilizing a spherical joint to mitigate misalignment risks. There's also a slurry sprayer tucked inside a chute, and the four-claw sealing helps with keeping pressure stable. The track holds up to 10 bar, which means muck removal goes pretty smooth.
This TBM variant is suited for formations with elevated uniaxial compressive strength and minimal stratigraphic discontinuity, offering a high-performance solution with favorable cost-efficiency in large-scale tunneling operations.
⚙️ Technical Features of Hard Rock Open-Type Gripper TBM
Geological Class Adaptability: Class II to Class V surrounding rock with good stability
Advance Rate: ≥ 30 meters/day (under normal geological conditions)
Tunneling Mode: Open-type gripper with high adaptability for hard rock conditions
Main Components: Cutter head, drive system, shield, main frame, saddle, shoe spreader, back support
Bearing Design: Equipped with large-diameter main bearing—largest in class for the same TBM specification
Drive & Propulsion: Unique jamming-propulsion mechanism with centering ball joint
Sealing System: Four-claw type lip seal with high-pressure endurance (up to 10 bar)
⚙️ Features of Hard Rock Open-Type Gripper TBM
High adaptability to hard rock formations with high integrity index and uniaxial compressive strength
Enhanced safety features and optimized structure for reliable performance
Suitable for complex strata such as hard rock zones
⚙️ After-sales Service 400-600-4666 (24 Hour Online)
NHI's after-sales service center is equipped with a team of over 200 experienced engineers, who provide year-round services for various projects in China and overseas. They offer comprehensive on-site support, including son-site parts inspection, installation guidance, operation training, equipment commissioning, and performance testing for final acceptance. The team promptly provides technical support for any issues that arise during equipment operation and system, ensuring full-process service for users.
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