Milling Mall Method Construction Case: Nishinari Branch Pipe 800mm Water Supply Pipe Installation Work

All-rounder of construction work! A case study of cutting steel sheet piles Type III!

This construction involved the installation of water pipes, where a φ1000 thrust pipe was pushed through, followed by the insertion of a φ800mm water supply pipe. After approximately 161 meters from the start, the first obstacle was cut, and normal thrusting continued for about 7 meters. Subsequently, the second obstacle was cut, allowing normal thrusting to reach the remaining 244 meters. During the approximately 9-meter section crossing the national road, excavation was carried out while injecting chemical agents inside the machine. As a result of the construction, there was no metal reaction from the first obstacle. After injecting chemical agents inside the machine and proceeding with thrusting, a metal reaction from the second obstacle was confirmed, and cutting of the obstacle began, with the discharge of metal fragments being verified. 【Construction Example】 ■ Project Name: Nishi-Nari Branch Pipe (Nishi-Nari) 800mm Water Supply Pipe Installation ■ Client: Osaka City Waterworks Bureau ■ Contractor: Mori-gumi & Hanshin Construction Joint Venture ■ Pipe Diameter: 1000 ■ Thrust Length: 411.65m ■ Soil Type: Sandy Soil, Clayey Soil ■ N Value/Gravel Ratio/Maximum Gravel Diameter: N=10, G=0%, φmax=0mm ■ Construction Period: Day and Night Work (8h) for 4.0 months (2014.2.5 – 2014.5.10) ■ Type of Obstacle: Steel Sheet Pile Type III, 1 location *For more details, please refer to the PDF document or feel free to contact us.

Site and ground investigationCivil Engineering MethodSpecial Construction Method