[Milling Mall Method Construction Case] New Tunnel Construction for the 2-1 Planning Route in the Temachi Area

All-rounder in construction work! Examples of cutting through 1m thick reinforced concrete walls, etc.

This document introduces the construction achievements of the new tunnel construction for the Otemachi District 2-1 planned route. In carrying out this construction, there was a possibility that underground connecting passages and foundation piles for the Tokyo Metro Marunouchi Line were present in the push pipeline section. The locations of the foundation piles were in a busy urban area with heavy road traffic, and since the burial depth of the push pipeline was very deep, it was necessary to ensure safe construction for both the launch and arrival. In the actual construction, there were no piles, and we cut 6 layers of the arrival shaft liner, 5 H-150mm pipes, and a 1m reinforced concrete wall of the manhole. 【Construction Case】 ■ Project Name: New Tunnel Construction for Otemachi District 2-1 Planned Route ■ Client: Marunouchi Heat Supply Co., Ltd. ■ Contractor: Shimizu Corporation ■ Pipe Diameter: 2600 ■ Pushing Length: 159.601m ■ Soil Type: Silty clay ■ N Value/Gravel Ratio/Maximum Gravel Diameter: N=19 ■ Construction Period: Day and night construction (17.5h) for 4 months (2014.12 to 2015.3) ■ Type of Obstacle: 1m thick reinforced concrete wall of the manhole, 5 H-150 pipes, 6 layers of liner *For more details, please refer to the PDF document or feel free to contact us.

Site and ground investigationCivil Engineering MethodSpecial Construction Method