The 132 3-meter diameter drilled piles of the main tower of the whole bridge were completed in 95 days, 31 days ahead of schedule

　             The drill pile construction of the main tower of the G3 Tongling Yangtze River Gongtie Bridge has been completed

　 April 21, 5:20 a.m，With the completion of the last drilled pile of the South bank main tower - Pile 21，It marks the successful completion of the drilled pile construction of the main tower of G3 Tongling Yangtze River Highway Railway Bridge, which is invested by the Municipal Exchange Group and constructed by China Railway Bridge Bureau Group，31 days ahead of schedule，This also marks the bridge construction finally from "invisible" to "visible".，The project construction has achieved a major victory in the stage，It laid a solid foundation for the G3 railway bridge to be completed and opened to traffic ahead of schedule。In the morning, the municipal trading Group sent a congratulatory letter to the China Railway Bridge Bureau Group。

　 G3 Tongling Yangtze River Bridge, No. 3, No. 4 of the main tower pier, is the whole bridge control project。Among them, there are 68 drilled piles in Pier No. 3, with a diameter of 3 meters and a hole depth of 122.5 meters;There are 64 drilled piles in Pier 4, with a diameter of 3 meters and a hole depth of 92 meters。The foundation of the bridge is designed as large-diameter rock-embedded piles, and the rock mass is extremely fractured, and there is a phenomenon of weak and uneven. The drilled piles need to pass through the thick strong and weak weathering broken bedrock and the rock depth is deep, and the pier cap must be buried deep to the river bed.The geological conditions are complex, the equipment performance requirements are high, and the construction technology is difficult。At the same time, it is difficult to construct and drill the steel casing of super-large diameter drilled pile, manufacture the steel cage, lengthen and lower it, pour underwater concrete and ultrasonic test of pile foundation。

　 Since drilling began on January 16，The project department has overcome the difficulties brought by the Spring Festival holiday, blizzard weather and the sudden COVID-19 epidemic，Measures such as leading shift work, optimizing construction technology, rationally allocating resources and ensuring material supply have been taken，We should focus on both epidemic prevention and production，It set a record of 79 hours to complete a single hole and 60 piles in a single month，132 drilled piles with a diameter of 3 meters were completed in 95 days，One month ahead of schedule，It set a new record for the construction of super-large diameter and ultra-long deep drilled pile on the Yangtze River，G3 speed was demonstrated with actual results。

　 G3 Tongling Yangtze River Railway Bridge is a key project to implement the national "Belt and Road", Yangtze River Economic Belt and Yangtze River Delta integration development strategy, is also a major infrastructure construction project in Anhui Province, Tongling based on the Yangtze River Economic Belt, accelerate the integration of Hefei metropolitan area, the Yangtze River Delta integration development of an important project。After the completion of the bridge, it will realize "iron-water combined transportation", further improve the port collection and distribution system, form a green and low-carbon comprehensive three-dimensional transportation network of highways, freight railways and intercity railways, and further promote the rapid economic development of Tongling City on both sides of the Yangtze River。