As cities expand underground, subway tunnel construction demands precise, durable, and efficient lining formwork systems. A poorly designed formwork can lead to schedule delays, safety risks, and substandard concrete finishes. This case study examines the critical requirements of tunnel lining formwork for subway expansion projects and demonstrates how Gaofei’s engineered solution delivered measurable improvements in speed, accuracy, and cost control for a major metropolitan transit authority.
Critical Requirements for Subway Tunnel Lining Formwork
Subway expansion projects impose unique constraints: limited access shafts, strict vibration limits near existing structures, and demanding concrete curing cycles. The formwork must be lightweight enough for underground handling, yet rigid to maintain profile tolerances under high pour pressures. Traditional timber or generic steel forms often fail in these conditions, leading to honeycombing or geometric deviations.
Key performance indicators for successful tunnel lining formwork include: repetitive accuracy (achieve consistent cross-section across hundreds of rings), rapid cycle time (stripping and resetting within 4–6 hours), and minimal site welding (to avoid fire hazards and speed assembly). Gaofei’s system was designed from the ground up to address these challenges.
Gaofei Tunnel Lining Formwork System: Design & Innovation
Modular Panel Construction with High-Strength Steel
Gaofei employs a proprietary modular steel panel system that interlocks via tapered wedges—no bolts required. This reduces assembly time by 40% compared to conventional bolted forms. The panels are fabricated from corrosion-resistant Q345B steel, guaranteeing over 500 reuses without dimensional loss.
Integrated Hydraulic Travel and Adjustment
Hydraulic jacks mounted on the base frame allow precise vertical and horizontal adjustment of ±50 mm, compensating for slight tunnel alignment variations. The entire form can travel on embedded rails, eliminating the need for crane repositioning every pour. For the case study project, this feature cut cycle time from 8 hours to 5.5 hours per ring.
…
For more details on the case study regarding tunnel lining formwork for the metro expansion, please click here: https://www.gf-bridge-tunnel.com/a/blog/tunnel-lining-formwork.html
