Core Underground Excavation Tools
Explore our specialized pneumatic equipment designed for maximum impact, drilling accuracy, and reliability across demanding rock formations in tunnel construction.
TY24c Pneumatic Hand Held Rock Drill
Pneumatic Drill YT29A Air Leg Rock Drill
TCD20 Paving breakers Handheld Pick Hammer
Pneumatic Hammer Drill TPB40 Air Pick Rock Drill Tools
Industrial Landscape & Dynamics of Tunnel Construction
01 Modern Underground Infrastructure Expansion
The modern civil engineering and mining sectors are experiencing an unprecedented surge in subterranean development. From trans-mountain railway networks and hydro-electric diversion tunnels to urban subways and deep-level ore extraction, the demand for fast, resilient, and cost-effective rock drilling tools has never been higher. Tunnel construction environments present extraordinary mechanical challenges, including highly fractured strata, variable rock hardness coefficients (f = 8 to 18), extreme humidity, and restricted spatial clearance.
In this challenging landscape, the YT24 Pusher Leg Rock Drill has established itself as an indispensable tool for drill-and-blast excavation methods. Unlike heavy automated drilling jumbos that require massive capital investment and spacious cross-sections, air-leg rock drills offer unmatchable agility, rapid setup times, and superior power-to-weight performance in small-to-medium tunnel headings, cross-passages, and auxiliary shafts.
Market Driver Breakdown
- Flexibility in Narrow Drift Construction: Ideal for cross-cuts, pilot tunnels, and steep incline shafts.
- Cost-Efficient Capex & Maintenance: Significantly lowers initial machinery capital compared to automated rigs.
- Adaptability to Variable Rock Mass: Handles hard granite, quartzite, basalt, and layered sedimentary formations.
- High Energy Efficiency: Optimized compressed air consumption delivers maximum percussion frequencies.
Engineering Specifications & Mechanical Architecture
Engineered specifically for heavy-duty tunnel driving and benching operations, the YT24 pusher leg rock drill incorporates advanced valving systems, high-torque rotation mechanisms, and integrated air-water flushing circuits.
Impact & Percussion Valve
Features a precision-machined flapper valve mechanism that minimizes kinetic energy loss. This ensures stable impact energy output at higher frequencies, facilitating rapid penetration rates even through tough, abrasive rock strata.
Pusher Leg Support Dynamics
Paired with the FT140 or FT160 air leg, the system delivers adjustable, smooth feed force. The pneumatic leg maintains consistent contact pressure against the tunnel face, reducing operator fatigue and increasing drilling straightness.
Strong Water Flushing Circuit
Incorporates a central water-flushing mechanism that injects high-pressure water through the hollow drill steel. This effectively clears rock cuttings, cools the drill bit, and suppresses hazardous airborne silica dust inside underground tunnels.
| Parameter / Specification | YT24 Rock Drill Standard Value | Tunnel Construction Benefit |
|---|---|---|
| Machine Weight | 24 kg | Optimal balance of portability and heavy-duty drilling stability. |
| Overall Length | 678 mm | Compact body allows operation in narrow tunnel headings and headings under 3m height. |
| Cylinder Diameter | 70 mm | Delivers massive percussive force for rapid rock fracture. |
| Piston Stroke | 70 mm | High energy transfer efficiency per stroke to the drill bit. |
| Impact Energy | ≥ 65 J (at 0.5 MPa) | High penetration rates in medium-hard to hard rock (f=8-18). |
| Air Consumption | ≤ 55 L/s (at 0.5 MPa) | Lower air compressor loads; highly economical for multi-drill worksites. |
| Air Hose Inner Diameter | 19 mm (3/4 in) | Standard fitting, easy integration into site pneumatic manifolds. |
| Water Hose Inner Diameter | 13 mm (1/2 in) | Efficient dust control and drill bit cooling under high-speed operation. |
| Shank Dimension | Hex 22 × 108 mm ± 1 mm | Compatible with worldwide standardized drill steels and button bits. |
Deep Application Scenarios in Underground Engineering
The YT24 Pusher Leg Rock Drill is versatile across various subterranean rock-breaking and tunneling disciplines.
1. Drill-and-Blast Tunnel Driving
In conventional drill-and-blast methods for road, railway, and hydraulic tunnels, the YT24 excels at drilling blast holes (cut holes, stoping holes, and relief holes) across the tunnel face. Operators utilize the pusher leg to quickly reposition and drill horizontal pattern arrays with precision.
2. Underground Mine Drift Development
In metal and non-metal mines, creating sub-level drifts, haulage ramps, and ventilation cross-cuts requires maneuverable tools. YT24 units can be deployed rapidly into newly blasted headings where heavy machinery cannot yet maneuver safely due to unbolted ground.
3. Rock Bolting & Roof Support
Establishing rock bolt anchorage is critical for tunnel structural integrity. The YT24 effectively drills upward inclined holes for installing split sets, resin bolts, and wire mesh supports, ensuring operator safety and ground stability.
4. Shaft Sinking & Underground Caverns
For hydroelectric surge chambers, underground transformer caverns, and vertical ventilation shafts, the YT24 offers reliable performance under steep angles and confined spatial constraints.
Operational Excellence & Maintenance Best Practices
Pneumatic System Lubrication
Always integrate an inline oil lubricator (e.g., FY200) into the air line. Ensure continuous oil mist delivery to prevent metal-on-metal friction within the piston cylinder valve chest during continuous tunneling cycles.
Air & Water Pressure Control
Maintain air working pressure between 0.4 MPa and 0.63 MPa, and water pressure around 0.2 to 0.4 MPa. Proper pressure differential prevents water backflow into the air motor, protecting interior components from rust and premature wear.
Routine Preventive Inspection
Regularly inspect the side rod tension, shank bushing clearance, and flush water tube condition. Replace worn components promptly to prevent vibration amplification and structural cracking of the drill body.
SHENLI Manufacturing & Corporate Profile
Industry-Leading Pneumatic Rock Drilling Technology
SHENLI is a leading supplier of superior pneumatic tools for the construction, mining and industrial markets. Since 2005, the Shenley brand has been synonymous with quality and innovation.
For over a decade, the SHENLI brand has represented performance, innovation and quality in the pneumatic tool industry. The SHENLI product line now offers a complete line of pneumatic tools, a wholly owned factory, pneumatic tools and a full line of accessories. With superior product performance, as well as superior product and reliability, competitive pricing for factory direct sellers, exceptionally ergonomically designed tools and quality warranty terms, Shenley has become an industry leader. We take every customer's problem seriously so that we can solve our common problems, and choosing Shenley is just the beginning for you. SHENLI will provide reliable service and support through every step of the process from product consultation to final delivery.
Corporate Culture & Vision
More attentive: Work together, keep improving
More Focused: With sincerity, you can achieve anything.
More thoughtful: Customer first, service first
Dare to innovate: Keeping up with the times and forging ahead
Company Mission: Striving to be a world-class supplier of rock drill tools!
Global Tunneling Engineering Cases & Client Success
The Dutch customer came to our factory and was satisfied with the production equipment, raw materials as well as advanced processes that we have in place. The client then signed a custom order for 500 units after being shown all of these great things about what is possible here at this facility! They hope long-term cooperation can occur between both parties moving forward since they are happy overall from their visit today.
The American customer visits our factory and has an in-depth negotiation to reach a long-term cooperation relationship. Their engineering team selected the YT24 pusher leg rock drill series for specialized tunneling and underground mining applications across North American sites.
The Japanese customer was very satisfied with the factory equipment and production process. He also proposed that they work together on design, which would give them an edge over their competitors who do not have this partnership!
We are delighted that Indian customers have visited our factory to learn more about ISO 9001 certification, which opens up new opportunities for us to collaborate. We explained in detail which parts go to which products, and how many different assembly lines there are, and we all understood. He is looking forward to working with us. This is our first cooperation, and we still maintain a cooperative relationship.
Factory Tour & Advanced Quality Assurance
Precision Manufacturing Capabilities
Raw materials: All materials are sourced from domestic and international well-known suppliers, and the quality is free from any flaws.
Processing: We have all precision machining production lines, including high-precision CNC lathes, and multi-axis CNC milling machines. Machine tools are from well-known brands, and online quality assurance is performed at every step.
Heat treatment: All heat treatment activities are carried out in a sealed quench furnace with facilities including but not limited to carburizing, nitriding, volume quenching, annealing, and tempering.
Grind: We have world-class grinding equipment that is capable of maintaining dimensions to within 3 microns. The grinding line includes state-of-the-art equipment including universal CNC grinding machines, cylindrical CNC grinding machines with process gauges, CNC internal diameter grinding machines, and universal CNC grinding machines.
Surface treatment: We offer a range of surface treatment options painting and other processes. These processes increase the service life of the tools and provide them with an appearance that meets the customer's requirements.
Assembly & Commissioning: Assembly and testing are carried out by our dedicated team on custom-built assembly platforms and test machines. Each assembled rock drill is tested for torque, BPM, and air consumption. After successful testing, each machine receives a test certificate to ensure its quality.
Quality Control Standards
- Customer satisfaction is achieved through the provision of 'zero defect' products and timely delivery.
- Ensuring an orderly programme throughout the assembly line.
- Increased production efficiency through the latest technology and automated inspection equipment.
- The company provides regular training to its employees in accordance with defined objectives, training needs and requirements.
Shenli is ISO 9001:2015 certified. We strive to constantly monitor and improve our processes to ensure the highest quality products. Experienced quality inspectors use a variety of precision instruments and special gauges to test the dimensional and functional performance of all components. Regular internal and external quality audits are carried out to continuously improve quality.
International Certifications & Compliance
CE certification is a mandatory conformity mark for certain products sold within the European Economic Area (EEA). CE stands for "Conformité Européenne" which translates to "European Conformity." The CE mark certifies that a product has met EU consumer safety, health or environmental requirements. CE certification also allows manufacturers to freely circulate their products within the EEA. ISO 9001:2015 is an international quality management system (QMS) standard that outlines requirements for a quality management system. The standard is designed to help organizations ensure they meet customer and regulatory requirements. Our factory has been ISO 9001:2015 certified since 2015, and all of our products are CE certified. This ensures that our products meet high standards of quality and safety, and that they can be freely circulated within the EU. CE certification and ISO 9001:2015 certification are just two of the ways we ensure that our products are of the highest quality.
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