—— Project Overview ——
The Qiaodian Bridge spans a canyon in a mountainous region, serving as a critical highway bridge. The bridge consists of two parallel structures, each with a total length of 240 meters (55m + 65m × 2 + 55m), a maximum span of 65 meters, a height of 79 meters, and a total weight of approximately 2,000 tons. Each bridge section features two trough-shaped main beams, with solid-web end crossbeams at the end supports and solid-web middle crossbeams at the intermediate supports. The transverse connections between box girders and internal supports are designed as solid-web truss structures. The bridge deck was constructed using Walking Type Synchronous Pushing Hydraulic Jacks.
—— Analysis of Key Construction Technologies ——
Qiaodian Bridge presents significant challenges—including a large launch span of 65 m, a continuous launching length of 240 m, pier heights of 79 m, and a girder setting‑down height of 6 m—and its deck lies on a 1 360 m radius curve, making the push‑launch operation highly complex with extremely elevated safety risks. To meet these demands, an intelligent walking type jacking hydraulic system was employed for synchronous launching, performing real‑time longitudinal and transverse deviation corrections to achieve precise synchronization and ensure the bridge alignment met design specifications. This solution delivered flawless, deviation‑free pushes and girder placements, guaranteeing each segment was set accurately in place.
—— Equipment Overview ——
KIET supplied the project with specialized hydraulic jacking equipment and a synchronized control system, including:
12 Intelligent Walking Type Jacking Hydraulic Systems
24 × 350 t crawler walking type jacking units
10 × 200 t girder setting‑down hydraulic jacks
12 hydraulic power units and associated control gear
