The new Liebherr LMC 80 mixing cutter can be used in all types of mixable soil to install load-bearing or sealing elements for ground improvement. The four cutting wheels are driven by a maximum torque of 2 x 80 kNm and achieve a maximum rotational speed of 30 rpm depending on ground conditions. The LRB 23 or LRB 355 piling and drilling rigs are used as carrier machines for the LMC 80.
Liebherr provides both the mixing cutter and the carrier machine for the application. Using an extension linkage, the LRB 23 piling and drilling rig can produce ground mixing elements to depths of up to 36 m, while the larger LRB 355 can reach depths of up to 40 m. Both versions can create panels with cross sections ranging from 2,800 mm by 500 mm to 1,000 mm, depending on site requirements and ground conditions.
For flexible use, the LMC 80 can be swivelled by 135 degrees around the mixing axis without moving the leader. The control system for the mixing cutter is integrated into the familiar operating concept of the carrier machine.
The verticality measurement displays information in real time on the operator’s monitor if the mixing element deviates from the vertical. This ensures the highest level of precision during operation. Thanks to the LIPOS positioning system and advanced satellite technology, operators can align the LMC 80 with pinpoint accuracy. MyJobsite, the digital solution for deep foundation applications, enables relevant process, machine, jobsite and positioning data to be recorded, displayed, analysed, managed and evaluated.
The LMC 80 is mounted on the carrier machine whilst lying flat. This saves time and is particularly safe since no work is carried out at height. The carrier machine’s crowd winch lifts the mixing unit into the working position.
To convert the LRB 23 or LRB 355 for piling or drilling applications, the mixing tool is simply replaced with a rotary drive, hammer or vibrator. Customers require just one carrier machine to perform all common applications in deep foundation work and benefit from the all-round qualities of the LRB series.
From an economic point of view, cutter soil mixing with the LMC 80 has further advantages compared to other ground improvement methods. Only a few building materials need to be delivered, and no excavated material needs to be transported, since only the existing soil is mixed with the binding suspension.
Liebherr said the LMC 80 mixing cutter offers noise-reduced and low-vibration processes in line with market requirements and contributes to a more environment-friendly solution.
