Mumbai University > Civil Engineering > Sem 8 > Construction Engineering

Marks: 5Marks

The ventilation means supply of air, light and keeping the level of noise to bearable to human beings.

Tunnels may require ventilation for a variety of reasons such as

To ensure an adequate air quality

to control the spread of smoke in case of fire

to reduce temperatures to acceptable limits.

The function of the ventilation relates to the type of tunnel.

1. Vehicular tunnels (road, rail and metro) generally require high air quality during normal operation and smoke control in case of fire

2. Cable tunnels require cooling, smoke control and a certain amount of air exchange.

3. Mine tunnels and station tunnels also require adequate ventilation for physiological, cooling and smoke control requirements.

The ventilation to be provided can be put under following two heads:

i. Temporary ventilation: when ventilation is to be provided only at the time of construction.

ii. Permanent ventilation: When ventilation isto be provided after the construction work is over, such ventilation system must be on permanent basis.