Construcciones Yamaro is a company always committed to be prepared and trained according to the current construction techniques. As road constructions are one of its strengths, it is almost mandatory for the company to be informed about each one of the steps for building tunnels. And it is about the conventional construction of tunnels or also known as conventional tunneling, that this post is thought to.
Conventional excavation can be defined as the construction of underground cavities arbitrarily, by using a cyclic process that includes the following steps:
- Excavation: using drilling methods or demolition, which can be explosive or very basic mechanical diggers.
- Removing the debris.
- Placing the primary elements of coating, these include:
o Meshes round.
o Bolts for soil or rock.
o Shotcrete or cast in-situ.
As mentioned, the conventional excavation is performed according to a cyclical execution process, which is the repetition of a series of steps and then a primer coating is applied. The technique for excavation and coating used will depend on the conditions and soil behavior, therefore, an experienced team of diggers operators held every construction cycle using the appropriate machinery.
The conventional tunneling method allows access to the front of the tunnel excavation almost anytime; in addition to that, it ends up quite flexible in situations or places that require a change in the structural analysis or design and, therefore, also require changes in the media coating.
This method provides a very flexible process that allows making the following changes during construction:
- Increasing or decreasing support.
- Varying time between excavation and coating application.
- Introducing a primary closure ring.
- Varying the explosive charge as required.
- Increasing or decreasing the length of each segment of the excavation.
- Segmenting the excavation face depending on the geological features present.
- Treating the floor according to the geological characteristics.