Lissmac completes ‘delicate’ concrete removal

Specialist asphalt and concrete company Friedrich W. Petersen (FWP) has completed the removal of a “highly resistant” road surface in Germany using vibration-free equipment.

The FWP team operates the Lissmac UNICUT 600 floor saw The FWP team operates the Lissmac UNICUT 600 floor saw. (PHOTO: Lissmac)

Described as a delicate task, the company was contracted to remove a 50 cm (20 in)-thick asphalt-cement surface, from a narrow residential street in the town of Wilster, to the northwest of Hamburg. The works were being carried out in order to install a new utility supply.

The asphalt-concrete surface was designed to provide maximum stability and was originally installed during a road renovation project, to help secure the marshy subsoil beneath the residential street.

Due to the sensitive nature of the works, no hammering or milling equipment or tools could be used. Instead, FWP used a Lissmac Unicut 600 floor saw for the task.

Ergonomically designed to help protect operators from low-vibration fatigue, the saw is fitted with a 100 kW (136 hp) diesel engine from Perkins and offers a cutting depth of up to 63 cm (25 in).

The Seedorf-based specialist divided the road surface into 50 square sections.

These were cut using the Lissmac, which at times had to be operated just a metre away from the houses, and drilled off at the sides to avoid chiselling out.

FWP’s team then lifted the sections out using a mini excavator. 

Willi Petersen, managing director at Friedrich W Petersen, said: “It was imperative that the work be carried out without vibration.”

To further comply with the project’s vibration specifications, FWP installed measuring devices on the surrounding houses to monitor the works.

“Keeping this as low and short as possible was a major concern for us,” added Willi.

“The measurement data from the vibration sensors also confirm that we have achieved this goal.”

The project saw FWP cut 50 cross-section lines, which added up to a total running length of 300 m (984 ft).

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