Kelly bars are key components in the execution of boreholes by hydraulic rotary drilling rigs. Telescopic Kelly bars transfer torque and crowd force from the rotary drive to the drilling tool.
Renowned for its operational ease and depth-drilling capabilities, the Friction Kelly bar stands out due to its reduced pressure transmission. This attribute makes it an optimal choice for a multitude of drilling projects. The 355mm variant, in particular, boasts a meticulously crafted dimensional design and exceptional performance, making it a top-tier selection. This is achieved through the utilization of cutting-edge manufacturing processes that ensure each and every detail adheres to stringent precision standards.
Hyper drill kelly bar is a highly specialized manufacturer of telescopic kelly bars to be applied to any type of piling rig available in the market.
Thoughtfully engineered to achieve an optimal balance between strength and flexibility, the 355mm size offers impressive resilience against immense pressure and torque. Additionally, it exhibits remarkable resistance to bending and torsion. These attributes collectively contribute to the extended lifespan of the drill pipe, subsequently mitigating maintenance costs.
Customization are workable according to buyers requirement.
our material selection
Construction and welding manufacturing process of Hyper drill kelly bars is by means of high quality materials and high mechanical features steel, provided with origin and quality certificates to guarantee long-life and reliability of the product after accurate engineering process.
Ensures good dimensional accuracy, position error and mechanical properties.
High hardness, high toughness and high wear resistance, thus reducing failure rate and maintenance costs.
What is a friction Kelly bar and how does it work?
A friction Kelly bar is a type of telescopic drilling tool used in piling and foundation construction. It consists of multiple interlocking sections that can extend and retract to reach different depths. Unlike interlocking Kelly bars, which use mechanical locks to prevent rotation between sections, friction Kelly bars rely on the friction generated between the overlapping sections to transmit torque from the drilling rig to the drill bit.
How It Works
1. Operation:
- Extension: As the drilling rig rotates and applies downward pressure, the friction Kelly bar extends section by section. The friction between the overlapping sections ensures that the entire bar rotates as a single unit.
- Torque Transmission: The friction surfaces between the sections generate enough resistance to transmit the rotational force from the rig to the drill bit, enabling the drilling process.
- Retraction: When the drilling rig lifts the Kelly bar, the sections retract back into each other, allowing for easy removal from the borehole.
2. Structure:
- Telescopic Sections: The friction Kelly bar is made up of several telescopic sections that slide within each other. These sections are designed to extend and retract, allowing the bar to reach various depths.
- Friction Surfaces: The sections have friction surfaces that create resistance when the bar is rotated, transmitting torque from the rig to the drill bit.
Applications
Friction Kelly bars are commonly used in soft to medium-hard soil conditions for various drilling and piling applications, such as:
- Bored Piles: Creating deep foundation piles for buildings and infrastructure.
- Caisson Drilling: Drilling large-diameter holes for piers and bridge foundations.
- Earth Retention Systems: Installing secant or contiguous pile walls for retaining structures.
Understanding the structure and operational principles of a friction Kelly bar helps in selecting the right tool for specific drilling projects and ensuring efficient and safe operations.
Why Buy from Us?
1. We make use of advanced processing equipments, techniques, and tools to manufacture the kelly bars that are compatible with a wide range of renowned drilling rigs. Our precision engineering ensures perfect matching for various brands.
2. Excellent performance:
Excellent compression, tensile and fatigue resistance to ensure the continuity and efficiency of drilling operations.
High-precision guiding function ensures accurate drilling direction and improves drilling quality.
3.The cutting-edge manufacturing technology:
We are pretty sure to guarantee the best relaiability, thanks to to quality of our raw material, certification of our steel and high respect to Quality standards ISO 9001 . All kelly bars are manufactured according to professional technical standards and they have a warranty of one year or 2000 working hours.
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FAQ
Q:What is a Kelly extension?
Q:What's a kelly bar on a rotary drilling rig?
Q: What is bored pile ?
A: Bored piles are cylindrical bodies made of concrete (with or without reinforcement) which are installed in the ground by a variety of methods. They transmit high structural loads into lower, load-bearing soils.
Q: How do you deliver kelly bars to oversea customers?
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