Milling Mall Method Construction Case: Edogawa Left Bank Area Sewer Pipe Construction Work

All-rounder in construction work! A case study of soil cutting for an inserted caisson.

This is an introduction to the construction achievements of the Edo River Left Bank Drainage Area Sewer Pipe Construction Project. During the construction of the lower section (φ1350mm mud water method, executed by another company), there was a hard soil-like obstacle that caused damage to the bit, leading to a design change at the site. To safely carry out the launch and arrival, a pressure-in caisson wall (originally planned to be unreinforced, but actually contained some reinforcement) was cut to L=0.9m on the launch side and L=0.3m on the arrival side. 【Construction Case】 ■ Project Name: Edo River Left Bank Drainage Area Sewer Pipe Construction (Ichikawa Main Line Section 502-2) ■ Client: Chiba Prefecture Edo River Sewer Office ■ Contractor: Hodota Corporation ■ Pipe Diameter: 1350mm ■ Pushing Length: 142.921m ■ Soil Type: Sandy soil and clayey soil ■ N Value/Gravel Ratio/Maximum Gravel Diameter: N=Average 18.5 ■ Construction Period: Daytime construction (8h) (10h during cutting) 2.5 months (2014.12.01 – 2015.2.13) ■ Type of Obstacle: Soil of the pressure-in caisson (Launch side L=0.9m, Arrival side L=0.3m) (Not detected this time, assumed to be H steel of SMW) *For more details, please refer to the PDF document or feel free to contact us.

Site and ground investigationCivil Engineering MethodSpecial Construction Method