1. GKTS TYPE – Classical Tunnel Formwork System
2. GRTS TYPE – Rail-Guided Classical Tunnel Formwork System
3. GATS TYPE – Heavy Duty Tunnel Formwork System

The TUNNEL FORMWORK SYSTEM is one of the most important steel formwork systems used to construct earthquake-resistant buildings by creating a monolithic structure through the simultaneous casting of shear walls and slabs.

Although the initial investment cost of tunnel formwork is higher compared to other formwork systems and requires the use of a tower crane—making it seem like a disadvantage—the major ADVANTAGES of using tunnel formwork in terms of labor, speed, and cost are listed below:

• Increased construction speed thanks to the ability to perform daily concrete pouring after an initial 10-day formwork setup period,
• High level of work safety provided by integrated scaffolding systems that surround all edges and openings,
• Elimination of the need for rough and fine plaster due to the high-quality concrete surface achieved with steel panels,
• Long service life (400–500 cycles) thanks to advanced production technology,
• Modular production allowing adaptation to both height and span variations,