Powerful Drilling Rigs From Liebherr Applied for Decommissioning Project

Powerful Drilling Rigs From Liebherr Applied for Decommissioning Project

Keller Grundbau GmbH, the engineering company assigned to carry out the decommissioning project for EnKK in Neckarwestheim, Germany, chose three Liebherr drilling rigs type LB28-320 and LB 36-410 for the challenging foundation work involved.

In Neckarwestheim the company Keller Grundbau GmbH is carrying out the foundation work for the new decommissioning centre belonging to EnBW Kernkraft GmbH (EnKK). The centre’s processing should reduce the amount of radioactive waste to a minimum. Three Liebherr drilling rigs, one LB 28-320 and two LB 36-410, were operating for the engineering company. The work started in April this year and were completed in September.

The machines were equipped for Kelly drilling and were installing the pile foundations for the waste disposal facility. In addition to single drilled piles with a diameter of 1.20 m and a depth of 20 m, a drilled pile wall was erected. The piles were in cohesive soil, cased at the final depth and inserted between 2 and 4 metres in hard rock.

The foundation work entailed drilling depths amounting to a total of 12,000 m. The Liebherr drilling rigs convinced with their high performance. Each machine produced three piles per day, a total of approximately 60 metres of drilling. “The leader adjustment of more than one metre provides a huge advantage, especially when positioning the machine in front of the drilling hole and when changing the tools,” explains foreman Juergen Schutte.

Easier Drilling Thanks to Operator Comfort and High Precision Machine Control

“Liebherr machines are simple to operate and user-friendly. That makes the drilling work easier when the soil conditions are challenging,” so the crane driver from Keller. The core of the Liebherr drilling rigs is the Litronic control system. Developed and manufactured by Liebherr, this comprehensive system encompasses all control and monitoring functions and is designed for extreme environmental conditions. All information necessary for the ongoing operation of the machine is displayed on a large touchscreen. This allows optimum diagnosis and early detection and prevention of more serious defects. A particular operating comfort is that all leader functions can optionally be operated via the electro-hydraulic proportional control. Thus, excellent positioning is provided in all fields of application.

High Performance Drilling Rigs for Various Applications

The LB 28-320 is used for creating drilled piles, whereby the most common methods are with Kelly drive, double rotary drive or continuous flight auger. The machine has a robust leader which easily absorbs both the rotary drive’s torque of 320 kNm, as well as the 40 t push and pull force of the rope crowd system. This ensures especially quick work cycles. The parallel kinematics of the leader system has a large working radius and allows for precise and stable operation. When Kelly drilling is applied the LB 28320 achieves a drilling diameter of up to 2,300 mm.

The LB 36-410 is the next largest machine in the LB series and has a torque of 410 kNm. The successful drilling rig from Liebherr is designed for the production of drilled piles. Various methods such as Kelly drilling, continuous flight auger drilling, full and partial displacement drilling or double rotary drilling can be applied.

Decommissioning Project in Baden-Württemberg as Part of the Energy Revolution

The aim of the EnBW is a quicker and more efficient decommissioning of the nuclear power plants in Baden-Württemberg, consistent with the interests of the energy revolution. The infrastructure is being built for the decommissioning of EnBW’s nuclear installations. Several buildings are planned for the processing of demolition materials and the storage of radioactive waste. EnBW estimates a period of two and a half years for the construction and commissioning of the facilities. Almost 6.6 billion euros have been reserved by the third largest German power concern for the decommissioning of its nuclear reactors in Neckarwestheim and Philippsburg.

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