en.Wedoany.com Reported - The first set of kilometer-level horizontal directional coring drilling equipment in China, independently developed by China Railway Construction Heavy Industry (CRCHI), recently passed certification from the National Construction Machinery Quality Supervision and Inspection Center, with core indicators reaching internationally leading levels, officially marking its debut.
This equipment integrates core devices such as directional coring rigs, directional coring tools, directional screw tools, and high-precision gyroscopic inclinometer systems, aiming to solve industry challenges in deep exploration, including "slow drilling, incomplete coring, and inaccurate measurement," providing robust support for major national underground engineering projects.
To address the "slow drilling" issue, CRCHI's kilometer-level directional coring rig is equipped with a self-developed wide-speed-range, high-torque power head, with a maximum torque of 15,000 N·m and a top speed of 800 rpm, supporting stepless adjustment of rotation speed, thrust, and pump flow. This rig can be paired with screw tools for directional drilling or with wireline coring tools for rapid coring; in favorable formations where coring is not required, it can switch to screw tools for fast passage, significantly shortening construction time. By integrating multiple sensors, a folding crane, and a rod handling manipulator, the equipment achieves self-storage of drilling parameters, fully mechanized rod handling, and automated drilling, greatly improving efficiency while reducing safety risks and labor intensity.
To tackle the "incomplete coring" challenge, CRCHI has broken through core technologies in directional coring tools. Under extreme conditions involving hard rock, fractured zones, and water inflows in a tunnel, it achieved simultaneous directional drilling and continuous coring, with a maximum drilling speed of 3.3 m/h, breaking technical monopolies and providing direct core evidence for building "transparent geology."
To solve the "inaccurate measurement" problem, CRCHI's high-precision gyroscopic inclinometer system effectively overcomes strong magnetic interference caused by dense steel bars and equipment in tunnels, achieving an azimuth accuracy of ±0.5°, reaching top domestic levels. The system supports dual-mode operation: the while-drilling mode enables real-time data transmission for immediate correction, while the storage mode records complete trajectories to generate precise "electronic archives," providing dual assurance for the equipment to move beyond "blind exploration."
This technology can be extended to various applications, including geological surveys, tunnel advance prediction, and TBM construction. In geological surveys, it can obtain precise geological information through long-distance directional drilling and continuous coring. In tunnel advance prediction, it can be deployed via bypass tunnels to achieve "simultaneous excavation and exploration," keeping the drilling ahead of the tunnel face. In TBM construction, it enables precise drilling control within target areas. Additionally, leveraging its disaster pre-treatment capabilities, the equipment can perform water drainage, rockburst pressure relief, and grouting support in fractured zones, comprehensively ensuring tunnel construction safety.
The systematic breakthrough of CRCHI's directional coring drilling equipment fills the gap in precise detection for deep and long tunnels in China, effectively driving the transformation of tunnel construction toward safety, efficiency, and intelligence.
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