How to dig a crossing tunnel

Cross tunnel excavation method is as follows:

1, dig a main tunnel first, and then dig a horizontal tunnel. When excavating a transverse tunnel, it is necessary to consider the support of the main tunnel and prevent its influence.

2. When excavating the transverse tunnel, it is necessary to adopt appropriate footage and schedule to ensure the safety and smoothness of excavation. At the same time, ventilation, drainage and lighting facilities need to be set in the tunnel to ensure the working environment and safety of construction personnel.

3. When the transverse tunnel is excavated under the main tunnel, special supporting measures should be taken to prevent the ground from collapsing, and the safety of construction personnel should also be considered.

4. Control the speed and progress of excavation to ensure safe and smooth excavation. At the same time, according to the geological conditions and tunnel structural characteristics, appropriate excavation methods and techniques should be adopted to achieve the best excavation effect.