Friction Kelly Bar

"Friction Kelly Bar – Elevate Your Piling Projects"

 

In the realm of deep foundation engineering, choosing the right equipment is crucial. Our Friction Kelly Bar is designed to tackle the most challenging construction environments and complex geological conditions, delivering unparalleled performance and dependability.

 

 

Adaptable Design: The modular design allows for easy adjustments in length and diameter, catering to different project requirements and significantly improving operational efficiency.

 

Superior Friction Capabilities: Engineered with advanced friction materials and techniques, our Kelly bar ensures optimal performance across various soil conditions, enhancing the stability and load-bearing capacity of your piles.

Durable Construction: Made from high-strength steel and crafted with precision, our Kelly bar withstands high torque and pressure, maintaining its integrity and durability in demanding conditions.

Effortless Maintenance: Featuring innovative connection and disassembly mechanisms, our Kelly bar simplifies routine maintenance and troubleshooting, reducing downtime and maintenance costs.

 

 

 

Off Shore and On Shore Projects: Guarantees stability and safety for the foundations.

Bridge Foundations: Perfect for various bridge foundation projects, providing robust and reliable support.

Maritime Construction: Performs exceptionally well in complex underwater geological conditions, ideal for port and wharf construction.

 

 

 

 

Friction Kelly Bar Index

 

Model	Drilling depth(m)	A(mm)	B(mm)	D(mm)	Total weight(T)
5 sections Friction φ377-5*10m	45	10190	46700	11400	5.08
5 sections Friction φ377-5*12m	55	12190	56700	13400	6.10
5 sections Friction φ406-5*13m	58	13075	60800	14570	8.02
5 sections Friction φ406-5*15m	68	15075	70800	16570	9.27
5 sections Friction φ445-5*13m	58	13075	60800	14570	9.79
5 sections Friction φ445-5*15m	68	15075	70800	16570	11.30
5 sections Friction φ419-5*13m	58	13075	60800	14570	8.98
5 sections Friction φ419-5*15m	68	15075	70800	16570	10.17
5 sections Friction φ470-5*13m	58	13075	60800	14570	11.05
5 sections Friction φ470-5*15m	68	15075	70800	16570	12.75
6 sections Friction φ508-6*13m	68	13075	60800	14580	12.7
6 sections Friction φ508-6*15m	81	15075	70800	16580	14.65
6 sections Friction φ580-6*18m	99	18050	98000	19750	20.54
6 sections Friction φ580-6*20m	110	20050	110000	21750	22.82
5 sections Friction φ530-5*16m	72	16050	88000	17750	15.30
5 sections Friction φ530-5*18m	82	18050	98000	19750	17.21
6 sections Friction φ630-6*20m	110	20050	113300	21700	25.89
6 sections Friction φ630-6*24m	130	24050	137300	25700	31.07
Other types can be manufactured as per customers' demand.

 

 

 

 

Kelly bars are available with a host of standard features, such as:

 

· 2-element to 6-element telescopic kelly bars for piling

· A depth range of 10m to 110m

· Torque transfer capacity of 80kNm to 500kNm

· Both interlocking and friction kelly bars

· High quality seamless steel pipes

· 6 cams and drive ribs

· A top flange used to connect the kelly bar to a kelly swivel

· Upper and/or lower spring shock absorbers

· A square kelly box for connection the drilling tools

· A drive pipe to transfer the torque and crowd force to the kelly bar

 

When selecting a kelly bar for a drilling rig, it's crucial to seek out bars constructed from high-quality steel with robust mechanical properties. Whether acquiring new or used kelly bars, it's advisable to choose those that come with documentation of origin and quality certifications to ensure their dependability and durability. Additionally, all kelly bars can be equipped with a damping noise system, which helps to minimize the high-frequency sounds generated during operation. This system involves applying a sound-absorbing material to the exterior of the kelly bar, safeguarded by steel plating.

 

 

1. Structure and Functionality
A Kelly bar is made up of multiple telescoping segments that can slide within one another. These sections are typically three to five in number, allowing the bar to extend as drilling progresses. There are two main types of Kelly bars:
-Friction Kelly Bar: Utilizes friction between the segments to transfer torque.
-Interlocking Kelly Bar: Employs mechanical connectors to securely lock the segments together, providing a higher torque capacity.

 

2. Operational Process
-Torque Transmission: The rotary drive of the drilling rig rotates the Kelly bar, which then transmits this rotational force down its length to the attached drilling tool. This rotation enables the tool to penetrate and cut through the ground.
- Extension and Retraction: As the drill advances deeper into the ground, the Kelly bar's sections extend to maintain the connection with the drilling tool. When the drill tool needs to be withdrawn, the Kelly bar retracts, section by section, lifting the tool out of the borehole.
- Vertical Load Application: The Kelly bar also serves to transfer vertical loads from the rig to the drill tool, enhancing the tool's ability to penetrate hard or dense materials.

 

3.Drilling Process
- Initiating Drilling: The Kelly bar begins in its fully retracted state. As drilling commences, the bar rotates and extends, driving the tool into the ground.
- Deepening the Borehole: As the borehole deepens, the Kelly bar continues to extend, ensuring consistent torque and pressure application throughout the drilling process.
- Withdrawing the Tool: When the desired depth is reached, or the tool needs to be emptied or changed, the Kelly bar retracts, lifting the tool out of the hole.
- **Repeating the Cycle**: This cycle is repeated, with the Kelly bar extending and retracting as necessary, until the borehole is completed to the required depth.

 

4. Summary
The Kelly bar is a vital component in drilling operations, enabling precise and efficient deep drilling. By combining telescopic extension with robust torque and load transfer capabilities, it ensures that drilling can be performed effectively across a wide range of geological conditions.

 

 

 

1. We are the premier kelly bar manufacturer in China to offer customers a one-year warranty. Our meticulous control over raw materials and adherence to multi-layer and multi-step precise welding guarantee that all aspects of kelly bar production comply with strict quality standards and monitoring systems, ensuring 100% superior quality.

 

2. The vital components of our kelly bars, like the square head, driving keys, and locking recesses, are fabricated by employing imported steel through specific heat treatment and surface reinforcement methods. These components not only present extraordinary yield strength, resistance to abrasion, impact, and strain, exceptional welding characteristics, and corrosion immunity but also fulfill the enhanced reliability requirements of kelly bars in the construction of hard rock, large-diameter, and ultra-deep piles. We have an exceptionally professional R&D and production team, committed to providing top-notch products.

 

3. Our kelly bars utilize steel pipes sourced from meticulously selected materials produced by leading steel enterprises both domestically and internationally. In contrast to conventional products, the yield strength and service life have more than tripled, catering to the stringent demands for drilling in hard rock and diverse geological layers.

 

 

4. The core R&D, processing, and production staff of our team all hail from prominent enterprises in this field, possessing over a decade of experience in the design and manufacturing of kelly bars. As a consequence, we have been able to furnish custom-built kelly bars and technical services for nearly all well-known brand names of rotary drilling rigs both within the country and globally.

 

 

 

 

 

 

 

 

 

 

 

 

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