Technical papersTechnical papers

Authors

Ing. Justo Suárez
Area Manager – Zitrón

Dot. Ing. Massimiliano Bringiotti
Managing Director – GEOTUNNEL

Ing. Ana Belén Amado
Responsible of CFD and Virtual simulation – Zitrón

00/00/2020

Abstract

Construction of new transport infrastructures is being a social demand during the last decades; therefore many countries have decided to carry out important investments on this field. Among these transport infrastructures, road and railway tunnels and Metro lines are the most significant ones. The amazing improvements and fast growing technology in mechanized tunnel excavation with TBM (Tunnel Boring Machine) has made possible the excavation of tunnels with several tens of kilometers.

Subsequently, the technology applied in the electro-mechanic installations to be installed in these tunnels, such as the ventilation, should also be improved. This is a serious challenge in front of us, in order to provide safe and efficient solutions to new and complex problems related to the passenger’s safety in these very long transport tunnels.

Authors

Roberto Arias Álvarez
Technical Director – Zitrón

Javier Fernández López
Technical Pre Sales Management – Zitrón

00/00/2020

Abstract

One of the main problems that could be suffered by the fans installed in the definitive ventilation systems is stalling, this being one of the major causes of concem for the operation contractors in charge of the ventilation systems of tunnels.

Stalling in axial fans is a phenomenon that can be compared with the situation experienced by aircraft wings where, as the angle of incidence of the airflow is increased, the lift force increases first, but falls abruptly when a certain critica! angle is exceeded. Figures 1 and 2 show both flow conditions.

Authors

Justo Suárez
Area Manager – Zitrón

Ana Belén Amado
R&D&i Department – Zitrón

00/00/2020

Abstract

Construction of new transport infrastructures is being a social demand during the last decades; therefore many countries have decided to carry out important investments on this field. Among these transport infrastructures, road and railway tunnels and Metro lines are the most significant ones. The amazing improvements and fast growing technology in mechanized tunnel excavation with TBM (Tunnel Boring Machine) has made possible the excavation of tunnels with several tens of kilometers.

Subsequently, the technology applied in the electro-mechanic installations to be installed in these tunnels, such as the ventilation, should also be improved. This is a serious challenge in front of us, in order to provide safe and efficient solutions to new and complex problems related to the passenger’s safety in these very long transport tunnels.

Authors

Luis J. Díaz
Zitrón

00/00/2020

Abstract

In society today, infrastructure availability has become an essential day-today need. This clearly poses new challenges. On one hand, we must provide permanent usability by extending the service life of our civil infrastructures, and on the other, we must design and develop equipment that does not fall into early obsolescence, all while reducing maintenance and the need for replacement over time. This is why it will be necessary to take measures to find how to integrate these two service lives, which diverge such a great deal from one another.

While the number of users of these infrastructures grows year after year, ventilation equipment, considered safety elements within the global tunnel as a whole, increasingly require maintenance or renewal operations. This is due firstly to the lifespan of the equipment within the environment, and secondly to the increasing legal requirements in terms of their safety.

Tunnels tend to be highly aggressive environments, with highly corrosive conditions. This is due to polluting gases from vehicles (with roadway tunnels), severe environmental conditions, or ongoing operability with freshair equipment, or infrequent, with fume exhaust equipment.

Using materials designed for high-corrosion tunnels, new surface coverings, equipment designed for preventive maintenance, as well as operability guidelines for ventilation systems, can lengthen the lifespan of said equipment, thereby obtaining the sought-after availability of our infrastructures without impacting the lives of their users.