Architecture and management of a geological repository - Andra

5 – Repository ModulesFigure 5.2.21Welding robot used for welding inside the sleeve (photograph courtesy of AirLiquide)• Assessment of basic solutionThe total execution time for the disposal cell using the drilling method is estimated at seven 8-hourshifts (total of 56 hours) broken down as follows:- thrust bench installation and removal: 5 shifts- disposal cell excavation, not including tube connection: 1 shift (40 m at 5 m/h)- miscellaneous (tube connection, cleaning, etc.): 1 shift5.2.5.3 Alternative solution: Microtunneling and thrust tubes left in placeIn this alternative solution, the head of the hydraulic motor driven microtunneller is pushed using thesleeve. Specific characteristics:- The tool is a retractable full-face boring wheel. Rotation is ensured by a hydraulic motor anchoredto the front end of the sleeve via lateral cylinders.Figure 5.2.22 shows industrial equipment used incivil engineering;- The pivoting wheel solution is preferred to the solution consisting of abandoning the boring wheelperiphery in the terrain (cleaner and more economic).- Broken rocks removal preferably performed using an endless screw.DOSSIER 2005 ARGILE -ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL DISPOSAL SYSTEM221/495