Milling Mall Method Construction Case: Reconstruction near Kasumigaseki 2-chome Part 2 Project

Cutting unexpected H-beams in six locations! A case study of construction work for thrusting on a heavily trafficked main road.

This is an introduction to the construction achievements of the reconstruction project near Nagatacho 1-chome and Kasumigaseki 2-chome, Chiyoda Ward, Phase 2. Initially, there was a possibility of two locations with reinforced concrete in the thrust pipeline section, and the thrust construction was conducted on a heavily trafficked main road. As a result of the construction, after cutting the reinforced concrete at two locations, we encountered unexpected obstacles. The unexpected obstacles were H-beams measuring H250 to H350, and we subsequently cut through six unexpected H-beams. 【Construction Case】 ■ Project Name: Reconstruction Project near Nagatacho 1-chome and Kasumigaseki 2-chome, Chiyoda Ward, Phase 2 ■ Client: Tokyo Metropolitan Sewerage Bureau ■ Contractor: Muramoto Construction Co., Ltd. Tokyo Branch ■ Pipe Diameter: 1500 ■ Thrust Length: 94.700 m ■ Soil Type: Clay ■ N Value/Gravel Ratio/Maximum Gravel Diameter: N=1-2 G=0% φmax=0mm ■ Construction Period: April 2015 to August 2015 (3.5 months) ■ Type of Obstacles: Reinforced concrete 2m thick at 2 locations 　　　　　　　Unexpected obstacles 　　　　　　　H-beams H-250 to H-350 at 6 locations *For more details, please refer to the PDF document or feel free to contact us.

Site and ground investigationCivil Engineering MethodSpecial Construction Method