Application of Sliding Construction Method in 72-Meter Span Tubular Truss Project

Construction Technology Innovation:
The 72-meter span tubular truss adopts a segmented sliding process, assembling the truss into single segments (≤60m) on the assembly platform. It is then slid along QU100 steel rails using a hydraulic jacking system, with a synchronization error of ≤5mm. The sliding shoe uses a combination of H400×400 variable cross-section columns and Φ89×5 diagonal braces to effectively transmit horizontal thrust and control lateral displacement. The jacks are arranged on axes 20, 24, and 27, and the thrust is dispersed through tie rods to ensure uniform structural stress.

Breakthroughs in Technical Challenges:
Addressing the outward thrust of the curved arch truss, the track adopts a combination structure of double I-beam upper and lower chords + channel steel web, with steel pipe strips added to the side wings to enhance rigidity. Real-time monitoring is performed using a total station (accuracy ±1mm) to control the sliding speed ≤15m/h and the downward deflection ≤L/1000. The temporary support spacing is ≤12m, and the overturning resistance coefficient is ≥1.5, ensuring the safety of high-altitude operations.

Comprehensive Benefits:
Compared to traditional hoisting, this process shortens the construction period by 40% and reduces the rental cost of large equipment by 60%. After sliding into place, the support installation is convenient, with a positioning deviation of ≤10mm, meeting the GB50205-2020 acceptance standards. It is suitable for the construction of large-span transportation hub roofs.