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2026 Tunneling Drill Rods Industry Panorama: Precision Matching · High-Efficiency Excavation
Release time:
Mar 14,2026
Source:
In the high-pressure environment of tunnel excavation, "Precision Matching" is the core to cost reduction. This article directly lists the primary application spaces for top hammer drill rods and mainstream specifications for rods and bits to help you master product selection and procure precisely.
I. Traffic Tunnel Engineering
1. Highway/Railway Main Lines
Models: T45-H38-T45 (Extension) / T45-H38-R32 (Starter)
Specs: Φ45mm Hexagonal Rod | Big End T45 Male Thread / Small End T45/R32 Female Thread
Scenario: 50-100㎡ cross-sections, mainstream construction in medium-hard rock.
2. Urban Metro/Light Rail
Models: T38-H32-T38 / T38-H32-R32
Specs: Φ38mm Hexagonal Rod | Big End T38 Male Thread / Small End T32/R32 Female Thread
Scenario: <50㎡ small cross-sections, flexible and rapid excavation.
3. Extra-Long Mountain Tunnels
Models: T51-R51-T51 / ST58-R58-ST58
Specs: Φ51/58mm Round Rod | Big End T51/ST58 Male Thread / Small End T51/ST58 Female Thread
Scenario: >25m deep holes, ensuring straightness in extremely hard rock.
II. Mining Sector
1. Underground Drift Development
Models: T38-H35-T38 / T45-H38-T45
Specs: Φ38/45mm Hexagonal Rod (H35/H38 across-flats) | Big End T38/T45 Male Thread / Small End T38/T45 Female Thread
Scenario: Haulage/Ventilation drifts; adapts to frequent machine relocation and medium-high torque.
2. Open-Pit Bench Drilling
Models: T51-R51-T51 / ST58-R58-ST58
Specs: Φ51/58mm Round Rod | Big End T51/ST58 Male Thread / Small End T51/ST58 Female Thread
Scenario: Large-diameter blast holes, high-bench deep-hole operations.
3. Stoping & Secondary Breaking
Models: T38-H32-R32 (Short Rods)
Specs: Φ38mm Hexagonal Rod | Big End T38 Male Thread / Small End R32 Female Thread
Scenario: Confined spaces, breaking large ore boulders.
III. Hydropower & Water Conservancy
1. Diversion Tunnels / Penstocks
Models: T45-H38-T45 / T51-R51-T51
Specs: Φ45mm Hex / Φ51mm Round Rod | Big End T45/T51 Male Thread / Small End T45/T51 Female Thread
Scenario: Long-distance hard rock excavation, high water pressure environments.
2. Dam Foundation Grouting & Anchoring
Models: T38-H35-R32 / T45-H38-R32
Specs: Φ38/45mm Hexagonal Rod | Big End T38/T45 Male Thread / Small End R32 Female Thread
Scenario: Precision anchor holes, slope reinforcement, anti-slide pile construction.
IV. Municipal & Underground Spaces
1. Utility Tunnels / Underground Parking
Models: T38-H32-T38 / T38-H35-T38
Specs: Φ38mm Hexagonal Rod (H32/H35 across-flats) | Big End T38 Male Thread / Small End T38 Female Thread
Scenario: Urban shallow buried cut-and-cover, low vibration requirements, soft-to-medium hard rock.
2. Civil Defense / Strategic Reserves
Models: T45-H38-T45 / T51-R51-T45
Specs: Φ45mm Hex / Φ51mm Round Rod | Big End T45/T51 Male Thread / Small End T45/T45 Female Thread
Scenario: Deeply buried high-protection grade rock masses, large-span caverns.
V. New Energy & Special Engineering
1. Pumped Storage / Geothermal Development
Models: T51-R51-T51 / ST58-R58-ST58
Specs: Φ51/58mm Round Rod | Big End T51/ST58 Male Thread / Small End T51/ST58 Female Thread
Scenario: High-angle inclined shafts/vertical shafts, long-term operation in high-temperature hard rock.
2. Nuclear Waste Repositories
Models: ST58-R58-ST58 (Specialized)
Specs: Φ58mm Round Rod | Big End ST58 Male Thread / Small End ST58 Female Thread
Scenario: >500m ultra-deep holes, ultra-high precision and stability requirements.
Summary: Core Selection Rules
Hexagonal Rods (Hex): T38 (H32/H35) / T45 (H38)
Advantage: Fast cuttings removal.
Application: Medium-shallow holes <25m.
Round Rods (Round): T51 (R51) / ST58 (R58)
Advantage: High bending resistance.
Application: Deep holes >25m and hard rock conditions.
Thread Rule:
Big End: Must be Male Thread (connects to bit/lower rod).
Small End: Must be Female Thread (connects to rig/upper rod).
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