[Construction Case] Ultra-large Diameter Pipe Pushing Work under Deep Depth and High Water Pressure
Construction case of the west Nippori trunk inflow channel connecting the pump building.
We would like to introduce a case study of a large-diameter pipe jacking construction under deep depth and high water pressure, commissioned by the Tokyo Metropolitan Bureau of Sewerage. This project involves the construction of the Nishi-Nippori mainline inflow channel (inner diameter 4,000mm) connecting the existing Nishi-Nippori mainline shaft (inner diameter 12m, depth 35m) and the Nishi-Nippori pump station. 【Project Overview】 ■ Project Name: Construction of Nishi-Nippori Mainline Inflow Channel at Higashi-Ogiku Purification Center ■ Location: 7-2 Higashi-Ogiku, Arakawa-ku, Tokyo (within Higashi-Ogiku Purification Center) ■ Client: Tokyo Metropolitan Bureau of Sewerage ■ Contractor: Wakatsuki Construction Co., Ltd. ■ Method: Earth pressure balance jacking method ■ Pipe Diameter: Ф4000mm (RC pipe type 70N/mm²) ■ Length of Jacking: L = 32.3m ■ Cover Depth: H = 29.8m ■ Soil Type: Sandy gravel (maximum gravel diameter approximately 300mm) ■ Hydrostatic Pressure Head: Approximately 30m ■ Construction Period: April 2012 to January 2013 *For more details, please feel free to contact us.
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basic information
To maintain joint performance and water tightness under high water pressure, the following measures are implemented for the assembled propulsion tube: 1) Rubber rings compatible with 0.4 MPa 2) Water-swelling sealing rubber (compatible with 0.6 MPa) is applied to the joint surface of the split section 3) Adhesive (acrylic resin) is applied to the entire joint surface to ensure a secure bond *For more details, please feel free to contact us.*
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Our company has been engaged in civil engineering projects across the country while inheriting the founder's intention of "developing and improving civil engineering technology." During this time, we introduced the thrust method for the first time in Japan in 1948, started our PC business in 1960, and established a local subsidiary in Taiwan in 2006 to begin our overseas expansion, thereby expanding our operations based on thrust method technology and PC technology.