RATP (Parisian Public Transport Authority), to which the Société du Grand Paris has awarded part of the project management for the southern extension, has selected the offer of the consortium led by VINCI Construction associated with Spie Batignolles, to build a 4.6 km tunnel between the future Maison-Blanche railway station in Paris XIII and the Villejuif tunnelling machine shaft. The contract includes the construction of the Kremlin-Bicêtre Hospital metro station and five ventilation and emergency shafts.
To construct the diaphragm walls at the Kremlin-Bicêtre Hospital site, several machines are working simultaneously: a SENNEBOGEN Duty Cycle Crane 6140 E with a mechanical diaphragm wall grab and a second with a rotoforeuse hydromill. The 1.54 m thick walls are reinforced with frame cages weighing up to 70 t and 50 m long, which are lifted and erected with the SENNEBOGEN 7700, a 300 t capacity crawler crane as service crane.Spie Batignolles Foundations, which has already owned two SENNEBOGEN 6140HDs for two years, expanded its fleet for work on Line 14 South at the beginning of 2019 with a third machine of the same type, this time equipped with a mechanical 25 t diaphragm wall grab. Thanks to its 350kN free fall winches and its versatility, the 6140HD SENNEBOGEN perfectly meets the needs of this new Parisian construction site in an urban environment, close to the A6 motorway and the Kremlin-Bicêtre hospital.Since their first operation, the SENNEBOGEN 6140 heavy duty cycle cranes have already proved their worth in several major Grand-Paris Express projects, particularly on Line 15 South. The teams are confident that the cranes used in the urban environment with their Tier4f compliant engines will reduce the environmental impact.Here, in the underground station of the Kremlin Bicêtre Hospital, the Spie Batignolles Foundation equipped one of the 6140 E with a 35 t, 550 kW XL rotoforeuse hydromill of the latest generation. The 708 kW motor of the duty cicle crane enables the drilling tool to be driven, which is controlled by the machine operator thanks to the modern and ergonomic touch screens and control panels in the cab. The grabs work at depths of up to 50 m on this job site, and the hydro-milling machine on the 6140E can even reach twice that depth, i.e. up to 100 m.