en.Wedoany.com Reported - Recently, with the final cubic meter of concrete injected into the pile hole, all 527 bored piles for the key control project of the Hefei-Chizhou Railway (hereinafter referred to as the "Hechi Railway")—a combined road-rail mega bridge—constructed by China Railway Sixth Group, have been completed, accelerating the development of the "Yangtze River Delta on Tracks."
According to reports, the combined road-rail section of the Hechi Railway, located on the southern bank of the Yangtze River, integrates national railway, urban railway, and highway, with a total length of 654 meters. It adopts a superimposed structure where lower-level railway piers "support" the upper-level highway framework. The construction area faces extreme geological challenges at the "confluence of rivers": the surface consists of highly deformable flow-plastic silt layers prone to shrinkage, beneath which lies a thick sand layer rich in confined water, and at the bottom, sandstone bedrock as hard as steel. This "soft top, gushing middle, hard bottom" sandwich-like geology, combined with stringent verticality requirements for pile foundations due to the upper and lower structures, makes hole formation as delicate as "threading a needle at high altitude."
Facing the "blind zone" of underground challenges, the project team introduced digital "X-ray vision" and intelligent "stabilizers" to achieve precise breakthroughs. The project department tailored construction plans for different strata: for soft soil layers, low-speed slow drilling and high-quality mud circulation wall protection techniques were adopted to prevent hole collapse; for sand layers, mud index parameters were optimized, and D-type drill bits were used to enhance hole formation efficiency; for bedrock sections, graded drilling and rigid guide devices were employed to correct trajectories, ensuring pile hole verticality deviation was controlled within 1%. Additionally, multiple quality control measures, including ultrasonic testing and dual-person dual-inspection of sediment at the hole bottom, were implemented throughout the process, achieving closed-loop management from hole formation and cleaning to reinforcement cage placement and concrete pouring.
It is reported that the new Hechi Railway line spans approximately 117 kilometers and is a core component of the Hefei-Wenzhou rapid railway corridor. The successful completion of the pile foundations for the combined road-rail section has bought valuable time for subsequent cap and pier construction before the flood season. Once the project is completed, the high-speed rail travel time from Hefei to Chizhou is expected to be reduced to within one hour, significantly enhancing the overall efficiency of the Yangtze River Delta railway network and facilitating convenient travel for the public.
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