Protecting Heritage: Liebherr MK 140 Secures Cathedral

• A Liebherr MK 140 mobile construction crane was used to secure the roof of Saint-Maurice Cathedral in Angers, France.

• The renovation work on the Gothic-style cathedral's roof began in October 2023 and is expected to last 14 months.

• The crane lifted ten protective elements, each up to 25 meters long and weighing up to two tonnes, to cover the 30-meter-high roof.

• The crane operated at a distance of 42.5 meters with a hook height of up to 30 meters, utilizing its maximum lifting capacities.

• The compact design and maneuverability of the MK 140 allowed it to cover the entire roof area from a single location.

Limited workspace on a historic building: In the western French city of Angers, the roof of the nave at Saint-Maurice Cathedral has been secured with protective measures. A Liebherr MK 140 mobile construction crane was instrumental in performing the necessary lifting operations.

Construction of the Gothic-style cathedral was completed around 1250. In 2024, extensive renovation work is scheduled for the church roof, which began in October 2023 and is expected to last 14 months. Umbrella-type protection has been erected over the 30-meter-high roof. Ten elements were lifted to the required height using an MK 140 mobile construction crane, which was successfully positioned next to the church, despite the limited space in the historic city center. The lifting operations were conducted by the French company Adekma on behalf of Entrepose.

Entire Roof Area Accessible from a Single Location

The elements used each measure 25 meters long, up to three meters wide, and weigh up to two tonnes. They were assembled at a significant height after being lifted to protect the church roof. The nave is 48 meters long and 16.4 meters wide.

The mobile construction crane operated at a distance of 42.5 meters, a hook height of up to 30 meters, and luffed positions of 30° and 45°. Throughout the task, the maximum lifting capacities were utilised across the entire load curve. Due to its maneuverability, compact design, and boom length, the crane was able to cover the entire roof area from a single location while remaining close to the building. The steep jib positions ensured the appropriate working height and necessary load capacity. The height adjustable operator’s cab provided the crane operator with an optimal view of the loading area and the cathedral roof.

Saint-Maurice Cathedral impresses visitors with a dome vault over 24 meters high and stained glass windows from the 12th, 13th, and 15th centuries. The building is listed among France's preserved historical monuments.