On June 4, 2026, with the completion of pouring for tunnel retaining pile foundation S2-A-6-B12, the deep foundation pit support system for the tunnel in Section 01 of the G236 Pingtianhu Tunnel and Connecting Line Project undertaken by Jiangong Jiantou Group achieved a major milestone—cumulative pile foundation construction has exceeded 1,000 piles!

As the longest urban lakebed tunnel in Anhui Province, the Pingtianhu Tunnel passes through highly permeable strata, with a maximum foundation pit depth of 18 meters; the quality of pile foundation construction directly affects the overall safety of the foundation pit. Facing the dual pressure of uneven soft and hard strata and the approaching flood season, the project team adopted a tactic of "breaking the whole into parts and advancing in parallel," dividing the tunnel work area into three smaller working faces: the portal section, the land section, and the deep-water cofferdam section. On this basis, four large rotary drilling rigs were deployed for simultaneous construction, each with two work shifts, ensuring that "work continues even when personnel change shifts." At the same time, an intelligent hole-forming detector was introduced, enabling a report on verticality and sediment thickness to be issued immediately after each pile is completed, achieving efficient quality acceptance of "one inspection per pile." In addition, a 24-hour flood-control duty and on-site drainage coordination mechanism was established to ensure construction resumes within 2 hours after rain. To ensure the schedule, the project team also used the evenings to work backward to an hourly-level schedule and assigned dedicated personnel to monitor key milestones, comprehensively driving efficient progress in pile foundation construction.