Ten Liebherr EC-B series tower cranes are being used for a EUR 650 million (CAD 921 million) project near Paris, France, known as the “Arboretum.”
The project is being described as a campus, with 1,000 planted trees and modern workplaces and is said to become the largest timber campus in Europe.
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Having as many as ten cranes on a construction site requires precise planning for efficient site operation.
The top-slewing cranes, which will remain in operation until mid-2023, have to be coordinated with one another so that they don’t interfere with each other’s lifts. Just how flexible Liebherr’s EC-B series can be is on impressive display in Nanterre, where flat-top cranes with different hook heights, jib lengths and load capacities are required.
“We opted for Liebherr cranes because of our longstanding business relationship,” says Antonio Silva de Almeida, the site manager in charge. “Liebherr cranes are ideal for carrying out this project because of their exceptional cost-effectiveness and safety standards.”
Liebherr customer GCC has two 220 EC-B 10s, two 250 EC-B 10s, one 250 EC-B 12, two 285 EC‑B 12s, two 340 EC-B 12s and one 370 EC-B 12 in operation. The jibs in use are between 47.5 and 60 metres in length. Hook heights range from 41 to 59 metres.
As a result of these configurations and their flat-top design, the cranes can rotate above each other without encountering any problems.
The transport and assembly-optimised cranes can, depending on the model, lift a maximum of ten or twelve tonnes. A 280 EC-H 12 high-top crane is additionally in use for the construction of the service centre.
Anti-collision system and crane operator lift
To ensure optimal safety, all cranes are equipped with an anti-collision system from the French manufacturer AMCS technologies. The machines also include Liebherr’s LiUP operator lifts, which particularly benefit crane operators and service engineers working at high hook heights, as is the case here. LiUP is designed to transport two people or a load of 200 kilograms. It gives crane operators quick access to their workplace and spares service engineers a strenuous climb during maintenance work.
The “Arboretum” project on the banks of the Seine will provide 125,000 square metres of office and service space and will be mostly built of solid wood. The offices are set to be spread over five buildings and each of them will be named after a tree: Almond, Pine, Cedar, Fir and Spruce. A park, a fruit and vegetable garden for the use of campus restaurants, and two renovated industrial buildings will complete the area. The campus will offer ongoing contact with nature so that employees working there can relax and concentrate better. Measures designed to reduce the site’s carbon footprint include the reuse of materials, bioclimatic architecture and a geothermal system that will cover up to 80 percent of heating and cooling requirements.
Precise positioning with Micromove
The construction of the new office buildings involves 20,000 cubic metres of wood from sustainably managed forests, as well as 55,000 cubic metres of concrete. All loads, some of which weigh several tonnes, have to be moved, and this is where the Liebherr tower cranes come in. “The cranes are reliable and powerful, and the LiUP lift ensures a high level of safety,” says site manager Antonio Silva de Almeida.
The top-slewing cranes are being used for positioning timber and concrete elements such as posts, beams, columns, staircases and lifts. This work is supported by the Micromove fine positioning mode. The assistance system makes perfect use of Liebherr’s own high-performance drives so that loads are moved with precision over the course of several minutes and positioned with accuracy. This protects precast filigree concrete parts and existing constructions on site.