Australian Independent School

A tunnel linking two Australian Independent School buildings in Jakarta, passing 10 metres beneath Jalan Pejaten Barat. We built 185 soldier piles Ø 800 mm to 19 metres as the tunnel’s earth retention system.

The main challenge was not the piles but the setting. The road could not be closed outright: a traffic management scheme was put in place at the start of the project to divert the flow, and partial closures were then applied only during certain stages, lasting some three months. The school kept running and working space was tight in a dense urban environment, so vibration, noise and traffic had to be managed throughout. Varying ground conditions across a 10 metre excavation also required method adjustments on site.

The works ran from July 2019 to March 2021.