Constructing two tunnels that intersect in a T-shape with underground branching from the main line shield!
The "Branch Shield Method" is a shield construction technique that simultaneously constructs two intersecting tunnels in a T-shape using a main line shield and a branch shield that launches laterally from within the main line shield. By launching the branch shield directly from within the main line shield, the need for an intermediate shaft is eliminated, and the setting of the branching position is not affected by surface conditions or the presence of buried objects above the pipeline. 【Features】 ■ The main tunnel and branch tunnel can be constructed simultaneously. ■ The branching position is not affected by conditions near the surface. ■ Ground improvement at the branch shield launch point is not required. ■ Shortened construction period and reduced costs. ■ The ratio of the outer diameter of the main tunnel to the outer diameter of the branch tunnel (approximately 60-65% of the outer diameter of the main shield is a guideline). *For more details, please download the PDF or contact us.
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【Construction Achievements】 ■Project Name: New Installation of Tanimachi-suji Pipeline and New Installation of Kaminihonmachi Line Pipeline ■Client: Kansai Electric Power ■Construction Details ・Main tunnel outer diameter Φ7.1m, branch tunnel outer diameter Φ4.1m ・At approximately 1.1km point of the main tunnel (pipeline length 2.7km), branching occurs 50m beneath the subway station building ■This construction project received the Technical Award from the Japan Society of Civil Engineers in the fiscal year 1998 *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.