The article discusses how pile underpinning technology was used in Shanghai subway construction to avoid disrupting traffic and residential areas. In a specific case on Shanghai subway line 10, a shield machine needed to pass through a bridge's pile foundation without removing or cutting the piles. The goal was to maintain traffic flow and minimize construction impact in a limited space. The key finding was that pile underpinning technology successfully allowed the shield machine to cross through the bridge's pile foundation without causing disruptions.