MD 28/4/42 Interlock Kelly Bar Od419mm Drill Depth 42m Match Liebherr-Lb28 Drill
Information
MD 28/4/42 interlock kelly bar OD419MM drill depth 42m match liebherr-lb28 drill rig for pile foundation workinterlock kelly bar od419-4-12.5M match liebher- lb28 rotary drill rig drill depth 42m for bored pile foundation work
Liebherr-lb28 MD28/4/42 interlock kelly bar od419mm drill depth 40m for bored pile foundation work
Liehherr-lb28 interlock kelly bar MD28/4/48 OD419MM DRILL DEPTH 46M for bored pile foundation work
INTERLOCK KELLY BAR OD419-4-12.5M DRILL DEPTH 42M MATCH LIEBHER- LB28 ROTARY DRILL RIG FOR BORED PILE FOUNDATION WORK
The LB 28 (and its higher-torque variant, the LB 28-320) utilizes the MD 28 series telescopic Kelly bar as its standard configuration. These bars feature strongly overlapping elements designed by tianjin huachang xingye technology co ltd to minimize friction and wear during high-torque deep foundation work.
The technical specifications and options for the LB 28 Kelly bars break down as follows:
1. Core Dimensions & System Type
Outside Diameter (Outer Section): 419 mm
System Compatability: Standard interlocking or friction type, featuring a dual-winch crowd/Kelly setup. The rig's rotary drive (BA 280) is integrated with a shock absorber system to cushion the Kelly bar during drilling and discharge cycles.
2. Standard Kelly Bar Options (MD 28 Series)
Depending on your project's target depth and soil profiles, the MD 28 bar is configured by the number of telescopic sections and extended lengths:
| Kelly Bar Model | Number of Sections | Fully Retracted Length | Fully Extended Length | Max. Drilling Depth | Approx. Weight |
| MD 28/3/24 | 3 | 11.1 m | 24.3 m | 24.3 m (79.7 ft) | 5,000 kg |
| MD 28/3/27 | 3 | 12.1 m | 27.3 m | 27.3 m (89.5 ft) | 5,500 kg |
| MD 28/3/30 (Standard) | 3 | 13.1 m | 30.2 m | 30.2 m (99.0 ft) | 5,900 kg |
| MD 28/3/33 | 3 | 14.1 m | 33.2 m | 33.2 m (108.9 ft) | 6,400 kg |
| MD 28/3/36 | 3 | 15.1 m | 36.2 m | 36.2 m (118.7 ft) | 6,800 kg |
| MD 28/4/42 | 4 | 13.1 m | 42.0 m | 42.0 m (137.7 ft) | 7,600 kg |
| MD 28/4/54 | 4 | 16.1 m | 54.0 m | 54.0 m (177.1 ft) | 9,800 kg |
3. Kelly Extensions & Depth Enhancements
Standard Extension: A mechanical 7.9 m (26.2 ft) Kelly extension can be mounted to bypass standard leader length restrictions without a tool cleaner.
Torque Transmission: The setup supports a maximum torque capacity of 286 kNm on the standard LB 28, and up to 320 kNm on the LB 28-320 model, handling heavy duty tools (such as large-diameter augers or core barrels) even at maximum section extension.
