CFA Concrete Grouting Machine Tool

1.  Features

 1.1 Structure and Material

• – Hollow shaft: Made of high-pressure seamless alloy steel pipe, which transmits torque and acts as a concrete pumping channel.
• – Continuous spiral flight**: Manufactured from high-wear-resistant steel with one-piece forming; scientific pitch (about 0.6–0.7 times the diameter) ensures smooth soil discharge.
• – Reliable connection**: Plug-in threaded / flange / hexagonal connection with good sealing, fast assembly and disassembly, and high tensile strength.
• – Complete specifications**: Commonly 400–800 mm in diameter, suitable for different pile diameters and strata.

1.2Performance Advantages

• – High efficiency & continuity: Drilling, soil discharge and concrete pumping proceed simultaneously, with high pile-forming speed (800–100 m/day).
• – Low disturbance & eco-friendly: No vibration, low noise, minimal impact on surrounding environment and foundations.
• – Wide stratum adaptability: Applicable to clay, sand, silt, soft rock, and gravel layers.
• – Controllable quality: With automatic control system, accurately controls drilling speed, lifting speed and concrete pressure, reducing pile breakage and necking.
• – Durability & reliability: Wear-resistant flights, high-strength shaft, double-sided welding at key parts, long service life.

2. Main Functions

2.1 Drilling and Hole Forming

• – Transmits torque and pressure from the drilling rig to drive the drill bit to cut soil.
• – Rotating spiral flights lift cuttings to the surface, realizing continuous hole forming.

2.2 Concrete Delivery and Pile Formation

• – After reaching the design depth, concrete is pumped through the **hollow shaft**.
• – Concrete is extruded from the bottom of the drill bit while lifting the auger, filling the borehole to form a complete pile.

2.3 Ensuring Construction Quality

• – Spiral flights slightly compact the borehole wall, improving shaft friction resistance.
• – Continuous pumping prevents hole collapse and necking, ensuring high pile density.
• – With monitoring system, records depth, pressure and concrete volume in real time for fullprocess control.

2.4  Improving Project Benefits

• – Fast pile formation shortens construction period.
• – High single-pile bearing capacity (1.5–3 times higher than ordinary piles), reducing pile quantity and material consumption.
• – No slurry wall protection required, reducing pollution and hole cleaning procedures, lowering costs.

3. 
   

   Application Scenarios

• – Building foundations, CFG pile composite foundations, foundation support piles.
• – Soft soil improvement in municipal, highway, railway and water conservancy projects.
• – Construction in urban and residential areas sensitive to vibration and noise.

Long Drilling Auger

Continuous Flight Auger