Recently, with the safe and precise positioning of the last 30-meter T-beam, the Sanba No. 1 Bridge of the Lexi Expressway S1-6 Project Department achieved full-span completion of both decks. With this, all T-beams of the mainline Sanba bridge area (Sanba No. 1 Bridge, Sanba No. 2 Medium Bridge, and Sanba No. 3 Bridge) as well as the J2 ramp medium bridge of the Dafengding Interchange have been fully erected, sounding the charge for achieving the project's annual investment and image progress targets.

The Sanba No. 1 Bridge has a total of 31 spans and 215 beam slabs. The bridge pile foundations contain extensively developed and widely distributed karst caves, making construction highly difficult. The longest percussion drilling time reached 9 months, with a hole depth of up to 70 m. To overcome the adverse geological conditions, all participating parties discussed solutions on site multiple times, continuously optimized the construction plan, and adopted technical and management measures to minimize quality and safety hazards. After a year and a half, all pile foundation construction was completed.

The full-span completion of both decks of the Sanba No. 1 Bridge has greatly boosted the confidence and morale of the construction personnel. It not only opened up a work front for the bridge deck system construction, but also provided access for the erection of 180 beam slabs in the Yonghong bridge area. Next, the Leibo Representative Office will continue to lead the participating units in its jurisdiction, firmly control the bottom lines of engineering safety, quality, and progress, strengthen process control, and, based on the annual investment and image progress targets, ensure that construction tasks are advanced with high quality and high efficiency.