Diesel engine drilling rig LB 55

rotarydouble rotary headdown-the-hole

Overview
The LB 55 drilling rig from Liebherr is a heavy-duty rotary drilling rig designed for deep foundation works. It supports multiple drilling methods — Kelly drilling, continuous flight auger (CFA), full displacement drilling (FDD), double rotary and down-the-hole drilling — and delivers a peak torque of 557 kNm with a 565 kW diesel drive, in a compact modular design for efficient transport and rapid site mobilisation.

Key features

• High torque rotary drive (approx. 550–557 kNm) suitable for demanding deep foundation applications.
• Supports multiple methods: Kelly, CFA, FDD, double rotary, DTH, soil mixing and slurry wall installation.
• Modular counterweight and leader for quick assembly and flexible configuration.
• Powerful winches with elastic mounting to increase performance and reduce noise emissions.
• Leader top designed for multiple drilling axes to allow versatile on-site setups.
• Operator comfort: modern air-conditioning, optimized visibility, noise protection and an orthopaedic seat with heating/cooling.

Operational and logistical advantages

• Basic machine and leader with hydraulic hoses connected can be transported as one unit to minimise on-site assembly time.
• Telescopic undercarriage and long crawlers enhance on-site stability.
• Designed for continuous operation with efficient on-board hydraulics and diesel drive for short drilling cycles.

Optional equipment and digital/assistance systems

• Automatic casing drive adapter with remote-controlled locking/unlocking for safer, faster casing handling.
• Digital fleet and tele-service solutions (PDE process data recording, MyJobsite, LiDAT telemetry and fleet management).
• Assistance systems: Kelly Visualization, Ground Pressure Visualization, Drilling Assistant, remote and radio remote control, auger fill-level display.
• Eco silent mode and automatic engine stop to reduce fuel consumption and noise.
• Casing oscillators and various hydraulically driven attachments operable from the on-board hydraulics.

Applications

• Kelly drilling
• Continuous flight auger (CFA) drilling
• Full displacement drilling (FDD)
• Double rotary drilling
• Down-the-hole (DTH) drilling
• Soil mixing / wet soil mixing
• Slurry wall installation
• Pile driving and ground improvement works

Technical specifications

• Operating weight: 162.5 - 178.2 t
• Max. torque: 557 kNm
• Max. crowd force: 560 kN
• Drive: Conventional diesel engine
• Engine power: 565 kW
• Kelly drilling, max. depth: 120.4 m
• Kelly drilling, max. diameter: 4,800 mm
• CFA drilling, max. depth: 32.6 m
• CFA drilling, max. diameter: 1,200 mm
• FDD, max. depth: 33.6 m
• FDD, max. diameter: 800 mm
• Double rotary, max. depth: 23.0 m
• Double rotary, max. diameter: 900 mm
• Soil mixing, max. effective length: 33.0 m
• Soil mixing, max. mixing diameter: 1,500 mm
• Min. transport width: 3,475 mm
• Min. transport height: 3,505 mm