In tunnel construction, the cost of concrete lining often represents a significant portion of the total project budget — and labor accounts for the largest variable expense. For every ring poured, the number of workers, their skill level, and the time required directly impact the bottom line. Traditional steel formwork systems demand extensive manual labor for assembly, alignment, stripping, and cleaning. However, modern tunnel lining formwork, particularly the advanced systems offered by Gangda Intelligent, fundamentally changes this equation. By integrating hydraulic automation, precise guiding mechanisms, and optimized panel designs, these systems can reduce labor costs by 30%–50% per ring while improving quality and safety. This article breaks down exactly how this cost reduction is achieved, ring by ring.
The True Cost of Labor in Traditional Tunnel Lining
To appreciate the savings, one must first understand the labor-intensive nature of conventional formwork. A typical ring cycle using manual formwork involves:
- Erection and alignment: 4–6 workers spend 2–3 hours positioning panels, adjusting screws, and checking plumb with laser levels.
- Re-bar and embedment installation: Additional laborers handle steel fixing and embedment placement within the form.
- Concrete pouring and vibration: Requires continuous monitoring to prevent blowouts or misalignments.
- Stripping and cleaning: After curing, 3–4 workers strip the form, often with crowbars, and manually scrape concrete residue.
On a typical project with 1,000 rings, these manual operations can consume over 10,000 man-hours. The hidden costs also include higher injury rates, rework due to alignment errors, and slower learning curves for new crews.
How Gangda Intelligent’s Tunnel Formwork Reduces Labor Per Ring
Automated Hydraulic Erection & Retraction
Gangda Intelligent’s tunnel lining formwork systems replace manual screw jacks and ratchet straps with hydraulic cylinders operated from a single control panel. A two-person crew can now move the entire form into position, adjust taper, and lock it in less than 30 minutes — reducing the labor requirement for erecting and stripping by 60%. The hydraulic system also ensures consistent pressure, eliminating the need for repeated re-checking.
Integrated Guiding & Alignment Systems
Instead of using laser transits and manual measurement, the formwork incorporates pre-set guide rails and embedded alignment sensors. This allows the crew to skip the 45-minute alignment ritual for each ring. One operator can fine-tune the position from a remote console. The time saved directly translates to fewer labor hours per ring — on average, 1.5 worker-hours saved per ring for alignment alone.
Faster Cycle Times Without Extra Crew
With traditional formwork, cycle time per ring (from strip to pour-ready) often exceeds 8 hours. Gangda Intelligent’s systems achieve cycle times of 4–5 hours for the same concrete volume. This is achieved through:
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For more detailed information on how to reduce labor costs per ring in tunnel lining formwork, please click to visit: https://www.gdtunnel.com/a/blog/tunnel-formwork-labor.html
