A rotary boring machine is powered by a hydraulic system. It uses the power head to drive drill rods to rotate and cut rock and soil, and completes pile foundation hole forming efficiently by taking soil with drilling buckets in cyclic operation. Integrated with mechanical, hydraulic, and electric control technologies, it is widely used in construction, bridge, railway, and other projects. It adapts to various geologies, including clay, sand soil, gravel soil and medium & slightly weathered rock strata, acting as core equipment to boost construction efficiency.
Hot-Selling Parameter of YG Rotary Rig Machine
| Item | Unit | Data | |
| Max. Drilling Diameter | mm | 1800 | |
| Max. Drilling Depth | m | 30 | |
| Engine | Model | / | Cummins, GBT5.9-C210 |
| Rated Power | kW | 154KW, 2200r/min | |
| Rotary Head | Max. output torque | kN .m | 100 |
| Rotary speed | r/min | 17-40 | |
| Oil Cylinder | Max. pull-down piston stroke | kN | 110 |
| Max. pull-down piston push | kN | 100 | |
| Max. pulling force | mm | 2000 | |
| Main Winch | Max. pulling force | kN | 100 |
| Max. single-rope speed | m/min | 70 | |
| Diameter of the steel wire rope | mm | 28 | |
| Auxiliary Winch | Min. ground clearance | kN | 60 |
| Max. single-rope speed | m/min | 54 | |
| Diameter of the steel wire rope | mm | 16 | |
| Traveling | Max. traveling speed | km/h | 2.6 |
| Max. grade ability | mm | 340 | |
| Approach angle | ° | 21 | |
| Departure angle | ° | 18 | |
| Max.grade ability | % | 30 | |
| Overall Weight | t | 28 | |
| Dimension | Transportation condition (L×WH) | mm | 11000×2600×3400 |
Four Core Technical Advantages of the YG Rotary Boring Machine
As a well-balanced rotary pile drilling rig, the YG-30 model is optimized in four key aspects:
High-strength Chassis & Large-diameter Slewing Bearing
It adopts a reinforced chassis structure matched with large-diameter slewing bearing, which ensures construction verticality even on uneven ground. This design also improves the overall anti-overturning capacity during drilling tool hoisting.
Single-layer Rope Main Winch
Its lowering speed reaches 70m/min. Equipped with bottom touch protection device, it effectively avoids rope disorder. Compared with multi-layer rope structure, single-layer rope prevents mutual extrusion and abrasion of steel wire ropes, making daily maintenance easier.
Dual-mode Power Head
It can switch between high-speed low-torque mode for soft soil layers and low-speed high-torque mode for rock strata, featuring strong stratum adaptability. It can also work with casing drive drilling or pipe arranging machines to expand construction capacity for casing driving work.
Winch Pressurization System
Designed with long stroke and large pressurizing force, it fully meets the demands of casing running operation. Meanwhile, the pressurization safety control technology based on main winch lifting force detection can monitor load in real time and prevent equipment damage caused by overload.
Square Rod vs Lock Rod Rotary Boring Machine: How to Choose
When using a rotary boring machine, the type of drill rod directly decides construction depth and the applicable stratum range. Their differences are as follows:
| Comparison Items | Square Rod Drilling Rig (Friction Rod Rig) | Lock Rod Drilling Rig |
| Operation Mode | Pressurized by friction between drill rods, so the bottom hole pressure is limited | Reverse rotation unlocking is required every time lifting rods. It has fixed unlocking methods, and unlocking difficulty rises with extended drill rod sections in deep drilling |
| Construction Parameters | Max drilling depth 30m, max hole diameter 1.5m, fast drilling speed up to 1 meter per minute | Drilling depth ranges from 30m to 60m, the max hole diameter of the dual power head model reaches 2.6m. It delivers strong drilling pressure with relatively lower speed |
| Stratum Adaptability | Only suitable for soft and loose strata such as soil layer, pebble layer, and strongly weathered rock, including clay layer, fill layer, and silt layer | Besides soft strata, it can drill into medium weathered rock and harder geology with wider application scope |
| Pressurization Principle | Pressurized by friction between drill rods, so bottom hole pressure is limited | Pressurized through platforms on drill rod keys. Four-section drill rods can realize full-pressure drilling with strong capacity for hard strata |
Summary: Wheeled rotary boring machine with square rod is ideal for small-scale projects within 25-meter soil layers, weathered rock, pebble, and clay areas. It features low budget and simple operation. Crawler rotary drilling rig with lock rod fits hard geology with construction depth from 15m to 70m. It requires sufficient budget and skilled operators and delivers high working efficiency.
Rotary Drilling Equipment Drilling Tool Matching Guide by Geology
Different strata put forward diverse requirements for drilling tools. Proper tool matching extends the service life of machines and improves hole forming efficiency. Recommended tools for common geology are listed below:
- Clay with strong plasticity and easy adhesion: Choose spiral drilling buckets with pick teeth/bucket teeth or rotary drilling buckets, and anti-stick coating is optional.
- Silt soil with high water content and easy hole shrinkage: Adopt rotary drilling buckets together with slurry wall protection and control rod lifting speed properly.
- Loose and easy-collapsible sand soil: Match the sand bailer with the slurry circulation system to reduce hole collapse risks.
- Large-particle gravel soil causing severe abrasion: Use pick-tooth spiral buckets or sand bailers fitted with extra wear-resistant plates.
- High-hardness medium and slightly weathered rock: Apply core drilling buckets with pick teeth or roller bits, which need a high-torque power head cooperating with lock rods. Selecting proper drilling tools helps rotary drilling equipment maximize its working performance.
Auxiliary Construction Equipment for Rotary Boring Machine
A single rotary pile drilling rig cannot finish pile foundation projects independently. The following auxiliary devices are essential:
- Slurry circulation system: Composed of slurry tank, pump set, and purification equipment. It provides slurry wall protection during wet hole forming to prevent hole collapse, and recycles and purifies slurry to meet environmental standards, being an important supporting part of rotary drilling equipment.
- Lifting equipment: Cranes or crawler cranes are used for hoisting drilling tools and steel reinforcement cages, as well as assisting rig moving and counterweight installation, suitable for large pile foundation projects and narrow construction sites.
- Concrete pouring equipment: Concrete pump trucks and hoppers work together to pour concrete into pile holes accurately via guide pipes. The working pace must match the hole forming progress to avoid hole wall collapse.
- Hole cleaning and measuring equipment: Sand bailers and air suction dredgers are used to clear the hole bottom sediment with thickness controlled within 5cm. Total stations and levels ensure accurate pile positioning, rig verticality calibration, and detection of hole depth and diameter.
- Generator sets: Supply stable power for the rotary rig machine and matched auxiliary equipment in remote construction sites with insufficient power supply to guarantee uninterrupted construction.
Reasonable deployment of the above equipment can increase construction efficiency by over 30%.
Contact Us
If you plan to purchase a rotary boring machine or want to know more about product selection and drilling tool matching solutions, please feel free to contact us! Our professional technical team can provide customized solutions according to your project demands and geological conditions, offering full services from equipment selection to on-site construction guidance. Our reliable rotary pile drilling rig and considerate services can fully meet your high-efficiency construction demands for municipal works, bridge projects, and building pile foundation construction. We sincerely look forward to cooperating with you to create high-quality engineering projects.
