📋 Tender Overview
The assembly and installation works of the gigantic tunnel boring machine on Line 2 of the Lima and Callao Metro show so far 80 progress. Placed at the San Juan de Dios station in the district of San Luis the apparatus that will dig and build a large part of the railway tunnel already has the motors that will make it work. The pre-assembly of the surface cutter head and tail shield is also almost ready. In addition the pressure test of hydraulic cylinders has already been carried out the cooling tower and the electric power supply have been installed.The hydraulic and electrical connections of the tunnel boring machine the assembly of the conveyor belt the installation and testing of the communications system among others have yet to be installed. It is estimated that by the end of June the total assembly of the TBM will be completed and it will be ready for operation.The machine is approximately 120 meters long and its cutting wheel measures 10.27 meters in diameter. With it the underground gallery of stages 1B San Juan de Dios Station Plaza Bolognesi and 2 Parque Murillo Puerto del Callao of Line 2 of the Lima and Callao Metro will be built. The colossal team is scheduled to start digging the tunnel from July.How does it work The excavation mechanism is given by means of its rotating head which is equipped with cutting elements and driven by hydraulic motors. Simultaneously with the drilling the device has the ability to place the concrete segments that serve to support the tunnel. The machine will begin to excavate from San Luis towards Callao.It should be noted that the removed material will begin to be extracted from the front through a huge worm that is 20 meters long. The conveyor belts will be in charge of moving the rubble outside the tunnel to the surface where it will be deposited in a pit and then taken to a landfill in San Martn de Porres. The excavation ring assembly and space filling processes are carried out continuously during the execution of the tunnel. It is estimated that 13 meters per day will be advanced.
