Shitouzhai tunnel Hengdong to No.3 inclined shaft of Yumo Railway Project Department of No.4 company of China Railway 21 Bureau smoothly connected 46 days in advance

The distant mountains of Yunnan in November are like Dai, and the golden osmanthus is fragrant. In the afternoon of November 25, from the small mileage of crosshole of Shitouzhai tunnel to the large mileage of No.3 inclined shaft of Yumo Railway Project Department of No.4 company of China Railway 21 Bureau Co., Ltd., after 1172 days of hard work, the tunnel was successfully completed 46 days in advance The total length of the tunnel is 11842m. The Yumo Railway Project Department of the fourth company of China Railway 21 bureau undertakes the construction of 4851m main tunnel. The tunnel is divided into 3 inclined shaft work area and exit horizontal tunnel work area. The total length of 3 inclined shaft is 1664m, with a longitudinal slope of 8.9%. The large mileage of the main tunnel of 3 inclined shaft undertakes the construction of 1300m. The total length of the horizontal tunnel is 285m, with a longitudinal slope of- 2.5%, the main tunnel and small mileage of the exit Hengdong work area undertake the construction task of 1800 meters. The project is characterized by tight construction period, difficult construction, long single head driving, very difficult ventilation and smoke exhaust and anti slope drainage, complex and variable tunnel geology, broken rock mass, obvious signs of surrounding rock extrusion, remote location of the portal, 28 km long main access road, extremely difficult material transportation, which is the most difficult construction site in this bid section. Shitouzhai tunnel is one of the key control projects of the whole line of Yumo railway, and it is also the control project of the bid section A 6031 a 6031 "confident life of 200 years, will be a water hammer of 3000 Li". Facing many difficulties, all the staff of the project department are brave of difficulties and unite as one. Through scientific allocation of construction team, machinery and equipment, strengthening of management personnel, optimization of construction scheme, risk management and control, multiple measures to ensure the supply of key line materials, strengthening of disaster assessment and monitoring, implementation of project leading group guarantee system, timely carrying out labor competition and other measures, further strengthened the responsibility and sense of responsibility of all staff participating in the construction, and ensured that all staff participating in the construction always Maintaining high morale has laid a solid foundation for continuous breakthrough in tunnel construction The completion of the tunnel from the Hengdong to the No.3 inclined shaft once again inspired the morale of all the staff involved in the construction and strengthened their determination and fighting spirit to overcome the danger. At present, the small mileage excavation of the main tunnel of No. 3 inclined shaft of Shitouzhai tunnel is 26 meters, and all the staff participating in the construction of the project department are fighting bravely to achieve the established goal. (Cao Qiang)