UNIDRILL® Kelly Bar In Bridge Projects

Why Unidrill

1. Material

Why do we dare to say that our kelly bar are the best in China?

First of all, it is because of our strict control on the material. When it comes to materials, we never cut corners. The first two sections of kelly bar are made of high quality SY550. Moreover, our kelly bar adapter is forged with 25CrMo material.

2. Construction

Reinforcement Ring Structure

We have innovatively added a reinforcement ring structure for each terminal joint, which is heat-treated to effectively reduce the risk of cracking the pipe during drilling.

Kelly bar Long Guide Structure Design

The design of long guiding structure can improve the verticality of hole formation, improve the stress on the lower pipe orifice, reduce the failure rate of lower pipe cracking, improve the stability of drill pipe compression, increase the width of the retaining ring, and prevent the deformation of the pipe orifice.

Drive Rib Design

Interlocking kelly bars are indeed provided with drive ribs which are welded with lock devices in order to transfer the maximum torque to each scope. To make sure to transfer the maximum torque over the full extended length.

Shock Absorbing Spring

For springs, we normally use the same disc springs as Bauer’s original kelly bar, which has a high load capacity for all kinds of kelly bar and a service life of over 3000hr. However, considering that what spring is used depends on the pressure, we will also use spiral spring for some friction kelly bar due to the low pressure.

3. Maintenance

We will provide maintenance solutions for terminal joint, flange part, kelly box and other components. Due to the epidemic, we will have video conversations with you to guide you on the proper care and maintenance of your kelly bar.

What should I pay attention to when using the kelly bar?

• 1. The maximum torque and pressure applied should not exceed the maximum allowable value of the kelly bar.
• 2. The main winch wire rope, pipe and power head drive sleeve are located at the same axis.
• 3. The mast of the drill pipe is kept vertical.
• 4. The drill head should be aligned with the center of the hole.

How should the kelly bar be maintained?
Good maintenance and operating habits can effectively avoid damage to the kelly bar.

• 1. Open it regularly for inspection and repair in time when wear is found.
• 2. Regularly check the welding seam.
• 3. Good operating habits.
• 4. Look at the appearance, listen to the sound of pumping and pulling, feel the friction and the sense of impact of each section.

4. Quality Guarantee And Warranty

Kelly bar of Unidrill is accompanied by a one year or 2000 working hours warranty. Customer satisfaction is our first and most important priority. Our warranty policy goes above and beyond our competitors and is one of the best reasons to do business with us. We want our customers to have an exceptional buying experience every time. Our warranty policy is designed to maximise our customers’ confidence.

For Bauer, Soilmec, Liebherr Rigs And More..

We provide drill pipe customization service. You can customize the length, diameter, drill pipe accessories and even drill pipe color for your Bauer or Soilmec etc. drill rig.