Continuously construct two types of tunnels with different cross-sectional diameters within the excavation extension.
The "Soil Pressure Type Parent-Child Shield Method" is a construction method that allows for the continuous construction of tunnels with varying cross-sectional diameters using a single shield within the shield excavation extension. A smaller child shield is incorporated within the parent shield to excavate the parent cross-section tunnel. At a designated position, the child shield is separated and launched underground from the parent shield to construct the child cross-section tunnel. By sliding the rear body of the child shield forward to incorporate it and adopting a method where the rear body is pushed out by the shield jack during assembly, the separation and launch can be completed in a short period. 【Features】 ■ The underground separation method eliminates the need for the installation costs of shafts and securing land at the position of cross-section changes. ■ The rear body push-out method significantly simplifies the assembly work of the child shield. ■ During the separation and launch operations, the front body remains fixed to the parent shield with a reaction pin, maintaining the stability of the face. *For more details, please download the PDF or contact us.
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【Construction Achievements】 ■Project Name: Urban Planning Project Yodogawa Right Bank Basin Sewerage Takatsuki Shimamoto Rainwater Main Line (Section 4) Sewer Pipe Construction Work ■Client: Osaka Prefecture Northern Basin Sewerage Office ■Finished Inner Diameter: Φ4000mm, Φ3000mm ■Required Days for Separation Start: 9 Days *For more details, please download the PDF or contact us.
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At Nishimatsu Construction Co., Ltd., we primarily engage in construction, development, and real estate businesses. With over 140 years of long history and tradition since our founding, we leverage our advanced technological capabilities as our strength to undertake the construction of public facilities such as roads and dams, as well as urban redevelopment, contributing to the development of safe and secure social infrastructure and comfortable environments. We aim to build win-win relationships with all stakeholders by providing valuable buildings and services, and we will contribute to the creation of a sustainable society and environment where people can live with peace of mind.