Kelly Bars are one of the key components of bore drilling, as it extends the depth at which hydraulic rotary drilling rigs or excavators can drill. Telescopic Kelly Bars are collapsible to save space during storage or transport.

Types of Kelly Bars in Drilling

Kelly bars are crucial components in the construction and drilling industry, especially for deep foundation piles and boreholes. Here’s a more detailed look at some common types:

1. Full Lock Kelly Bar

  • Structure: Solid with continuous outer and inner sections.
  • Stability: Provides maximum stability, making it suitable for various drilling methods.
  • Aplikácie:
    • Rotary drilling
    • Continuous flight auger (CFA) drilling
    • Effective in diverse soil types
  • Všestrannosť: Excellent for torque transmission, making it adaptable for most drilling applications.

2. Trecia tyč Kelly Bar

  • Structure: Consists of interlocking sections that rely on friction for connection.
  • Stability: Offers less stability compared to full lock bars but is lighter and easier to handle.
  • Aplikácie:
    • Ideal for drilling in soft to medium soil conditions.
    • Often used in areas where high torque is not required.
  • Advantages: More flexible for certain drilling methods, allowing for easier repositioning.

Kelly bar piling drilling rigs are specialized machines used for foundation piling through drilled pile technology. These rigs utilize both Continuous Flight Auger (CFA) and Kelly bar methods to create drilled piles.

Key Features of Kelly Bar:

  • Telescopic Design: The Kelly bar consists of multiple tubes that extend in length as the rig drills deeper into the ground.
  • Rotary Mechanism: The drilling process is powered by a downward thrust from the rotary head, often referred to as the rotary. This can operate using either an oil bath or grease bath system.
  • Torsional Force: The Kelly bar connects to the rotary, generating the necessary torsional force to penetrate and excavate the soil.

Types of Rig Mounting:

Kelly bar pile drilling rigs can be configured in various ways:

  • Tracked Rigs: Mounted on tracks for mobility across rough terrain.
  • Chassis Rigs: Built on a stable chassis for enhanced stability.
  • Excavator-Mounted: Adapted for tracked excavators, featuring either iron or rubber tracks.
  • Truck-Mounted: Designed for transportation via trucks for easy relocation to different construction sites.

Aplikácie

These rigs are essential on construction sites, equipped with specialized drilling tools to perform effective and efficient drilling operations. Their design and functionality allow for versatility in various soil conditions and project requirements.

Additional Considerations

When selecting a Kelly bar, factors such as drilling method, soil conditions, and rig design must be considered to ensure optimal performance. Each type of Kelly bar has its unique advantages tailored to specific applications within the drilling industry.