Liujiazui tunnel excavation depth is 800 meters, sharp hillside tunnel excavation is 600 meters, construction of CN-4 section piers has been completed 52%, and the construction of pre-engineering bridge piers of CN-5 has already been finished... On April 8, the reporter saw the construction of the tenders is progressing as scheduled in South Sichuan. Construction workers from all over the country stayed at the front line during the Tomb Sweeping Festival to ensure that the railway was completed and put into operation as soon as possible.