Rotary Drilling Rig Interlocking Kelly Bar

Rotary Drilling rig interlocking kelly bar is a crucial component employed in hydraulic rotary drills for drilling activities. It comprises 2 to 5 telescopic tubular sections, each having a drive key and lock slot system welded onto the outer surface. Its primary function is to concurrently convey the torque of the rotary drive and the pressure of the pressurization system to the drilling tool.

 

Each terminal joint innovatively incorporates a reinforcing ring structure with heat treatment, which can effectively lower the risk of pipe cracking during drilling. The long guide structure design enhances the verticality of the drill hole, improves the stress at the lower orifice, reduces the failure rate of lower pipe rupture, boosts the stability of the drill pipe under pressure, and increases the width of the guard ring to prevent orifice deformation. The interlocking square drill pipe is outfitted with drive ribs welded to the locking mechanism to guarantee that the maximum torque is transmitted to each telescopic section, thereby transmitting the maximum torque throughout the fully extended length.

 

The product shows excellent compatibility, being compatible with a broad range of rotary drilling rig models. It is applicable to various projects and can be utilized in different contexts. It is safe and dependable, featuring a sturdy structure and reliable interlocking mechanism. These characteristics enhance operational safety and minimize the probability of accidents.

 

 

 

Rotary Rig Interlocking Kelly Bar

 

Type	Drilling Depth	A	B	D	Weight
	(m)	(mm)	(mm)	(mm)	(T)
3 Sections Interlocking Φ394-3×13m	33	13190	36200	14640	8.5
4 Sections Interlocking Φ394-4×15m	52	15190	55000	16640	11.5
5 Sections Friction Φ419-5×13m	58	13075	60800	14570	8.98
4 Sections Interlocking Φ419-4×13m	44	13190	46700	14640	9.15
5 Sections Friction Φ470-5×22m	100	22100	102800	23600	17.75
4 Sections Interlocking Φ470-4×18m	64	18190	66700	19640	15.53
6 Sections Friction Φ508-6×13m	68	13075	60800	14580	12.7
5 Sections Interlocking Φ508-5×15m	68	15075	70800	16580	13.84
4 Sections Interlocking Φ508-4×13m	44	13190	46700	14670	10.8
3 Sections Interlocking Φ508-3×15m	39	15190	42300	16640	13.44
6 Sections Friction Φ580-6×20m	110	20050	110000	21750	22.82
5 Sections Interlocking Φ580-5×18m	82	18050	81500	19750	21.83
4 Sections Interlocking Φ580-4×18m	64	18050	65500	19750	19.01
Other types can be manufactured as per customers' demand.

 

 

 

An interlocking Kelly bar is a type of drilling accessory used in foundation and piling operations, particularly with rotary drilling rigs. It is designed to transfer rotational force from the drilling rig to the drill bit or other drilling tools. Here's a detailed look at what it is and how it works:

 

What is an Interlocking Kelly Bar?

 

An interlocking Kelly bar is a specialized type of Kelly bar with a unique design that includes interlocking sections. These sections connect and lock together, allowing the Kelly bar to extend or retract based on the drilling depth and requirements.

 

How Does It Work?

 

1. Structure and Design
- Segments: The interlocking Kelly bar consists of multiple segments or sections that fit into each other. Each segment has an interlocking mechanism that secures the sections together.
- Interlocking Mechanism: Typically, the mechanism involves a series of teeth, pins, or other locking devices that ensure a secure connection between segments. This design allows the Kelly bar to be extended or retracted by adding or removing segments.

 

2. Connection to the Drilling Rig
- Attachment: The Kelly bar connects to the rotary drilling rig via a drive system. This system transfers rotational torque and axial force from the rig to the Kelly bar.
- Rotation and Drive: As the rig rotates the Kelly bar, it transmits rotational force to the attached drill bit or other tools. The interlocking design ensures that the torque is evenly distributed along the length of the Kelly bar.

 

3. Operation in Drilling
- Drilling: The interlocking Kelly bar is lowered into the borehole, and the rotation drives the attached drilling tools to penetrate the ground. The interlocking sections allow for flexibility in adjusting the length of the Kelly bar to accommodate different drilling depths.
- Extension and Retraction: The ability to add or remove segments makes it easier to adjust the length of the Kelly bar as drilling progresses. This feature is particularly useful for reaching various depths without needing to change the entire Kelly bar.

 

4. Benefits of Interlocking Design
- Flexibility: The interlocking design provides flexibility in adapting to different drilling depths and conditions.
- Durability: The secure locking mechanism ensures that the Kelly bar remains stable and reliable under high rotational forces.
- Ease of Handling: The modular nature of the interlocking Kelly bar makes it easier to handle, transport, and assemble on-site.

 

5. Applications
- Foundation Drilling: Commonly used in foundation drilling for constructing piles, piers, and other deep foundation elements.
- Piling Operations: Useful in various piling operations where precise control over drilling depth is required.

 

 

Conclusion

An interlocking Kelly bar is a versatile and efficient tool in the drilling industry. Its modular, interlocking design allows for easy adjustments in length, providing flexibility and enhancing the performance of drilling operations. By securely transferring rotational force and accommodating various drilling depths, it plays a crucial role in modern foundation construction and piling projects.

 

What is difference between the interlocking and friction kelly bar?

Interlocking bars are more efficient in transmitting torque due to their locking mechanism, making them suitable for harder ground conditions. Friction bars are simpler and used in less demanding conditions.

 

 

A rotary rig, also known as a rotary drilling rig, is a type of drilling equipment used to create boreholes in the ground for various applications such as construction, mining, and geotechnical investigations. The rig operates by rotating a drill bit to penetrate the soil or rock while simultaneously advancing the drill string. This method allows for the efficient drilling of deep and large-diameter holes.

 

Key Components of a Rotary Rig:
1.Rotary Table: Provides the rotational force to the drill string.
2. Drill Bit: Cuts through the soil or rock.
3.Kelly Bar: Transmits rotational and vertical forces from the rotary table to the drill bit.
4.Drill String: Consists of interconnected pipes that extend the length of the drill hole.
5.Mud Pump: Circulates drilling fluid (mud) to cool the bit and remove cuttings.

 

Famous Manufacturers of Rotary Rigs:
1. Bauer: Known for its high-quality rotary drilling rigs and ground engineering equipment.
2. Soilmec: Specializes in rotary drilling rigs, diaphragm wall equipment, and other geotechnical machinery.
3. SANY: A major player in construction and drilling equipment, offering a range of rotary rigs.
4. Mait: Provides rotary drilling rigs and foundation equipment with a focus on performance and innovation.
5. Kobelco: Known for its reliable and durable rotary rigs used in various construction applications.
6. Casagrande: Offers advanced rotary drilling rigs and other foundation machinery with a strong emphasis on technology and efficiency.

 

These manufacturers are renowned for their innovation, reliability, and high-performance drilling equipment used in a wide range of applications worldwide.

 

 

 1) We manufacture key components of Kelly bars from imported steel via special treatment. These encompass the square head and more. Such parts are of the highest quality, featuring superior properties and reliability for hard rock, large-diameter, and super-deep piles. Our teams are committed to quality.

 

2) Our kelly bars employ the finest steel pipes, outmatching others with twice the yield strength and service life, making them ideal for hard rock and diverse strata.

 

3) 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 we offer a warranty of one year or 2000 working hours.

 

4) Our team comprises the most outstanding personnel with over ten years of experience. We are capable of providing customized Kelly bars and services for numerous leading rotary drilling rig brands.

 

5) We offer drill pipe customization service. You can customize the length, diameter, drill pipe accessories and even drill pipe color for your drilling rig.

 

 

 

 

 

 

 

 

 

 

 

 

 

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