Introduction to tunnel formwork

Tunnel formwork is a temporary system used in underground construction to shape and support concrete while it sets and gains strength. Its main function is to guarantee the shape and stability of the concrete lining that makes up the tunnel structure. This process is essential in civil engineering, especially in road, rail and utility infrastructure projects that require underground excavations.

These systems must be adapted to the particular geotechnical conditions of the terrain and the dimensions of the tunnel, in addition to allowing rapid installation and demolding to optimize construction times. Tunnel formwork is a key element for the safety and structural quality of underground works.

Conventional wooden formwork

Wooden formwork is one of the most traditional methods for tunnel construction. It consists of the use of wooden panels and structures that are molded according to the profile of the tunnel. Its main advantage is the ease of adaptation to different shapes and sizes, as well as its low initial cost.

However, wood has limitations in terms of its durability, strength and ability to withstand high pressure loads from fresh concrete. In addition, it requires constant maintenance to avoid deformations and moisture damage, which can affect the quality of the final coating.

This type of formwork is mainly used in small-scale projects or in tunnels with simple profiles and favorable geological conditions.

Metal formwork

Metal formwork is made of steel or aluminum, materials that offer great mechanical resistance and durability. These systems can be modular and reusable, making them ideal for tunnel projects with repetitive or large profiles.

In addition, the metal formwork facilitates faster installation and disassembly, allowing an efficient work cycle and minimizing downtime on the job. Its smooth surface also contributes to a more uniform and high-quality concrete finish.