Minimizes impact on the environment and the neighbouring community

Compared with other methods like cut and cover, the construction activities for using TBMs take place entirely underground, which effectively reduces noise, dust, vibration and disruption. Use of TBMs also helps improve efficiency and minimize the impact on the ecological environment when the works need to be carried out beneath rivers or conservation areas. Less surface ground areas are to be used during construction, significantly minimizing the impact to the community and traffic.

Reduce the risk of settlement and enhance project efficiency

With different work procedures taking place at the same time including excavation and installation of permanent pre-cast tunnel walls, TBM is highly efficient compared with traditional blasting or cut and cover tunnelling, hence enhancing project efficiency. Risk of settlement will be greatly reduced and loss or movement of the underground water table will be avoided, with little adverse impact to the building structure.