Ishigami River Upper Reservoir Underground Regulating Pond Construction Contract Award

The official contract opening for the Ishigami River Upper Reservoir Underground Regulating Pond Construction project, which is a component of Tokyo's larger flood control and infrastructure fortification plan, took place on October 2, 2018, at 9:15 a.m., marking a significant milestone. The first entrance hall on the south side of the first dorm building in Tokyo's capital district, located on the 35th level, hosted the tender opening.

This project is part of the shield fortifications business, which is a specialised field that involves building subterranean reservoirs and large-diameter tunnels.

Contract Details

• Contract Number: 07-00037

• Department: Finance Department - Contracts Lesson 1

• Procurement Type: Public tender (announcement afterwards)

• Predetermined Price: ¥104,978,469,200 (incl. tax) / ¥95,434,972,000 (excl. tax)

• Survey Benchmark Price: ¥97,629,976,356 (incl. tax) / ¥88,754,523,960 (excl. tax)

• Drop-in Rate: 93.0%

• Deposit Amount: ¥97,652,500,000

Participating Bidders & Evaluation

Winning Bidder:
???? Taisei-Kashima Construction Joint Venture
Head Office: 6-8-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo

This joint venture achieved the highest total evaluation value (0.1729), securing the contract award.

Project Scope & Execution

Execution Locations

• 1-chome, Minami-machi, Nishi-Tokyo City, Tokyo

• 2-chome, Hachiwata-cho, Musashino City

Construction Overview

• Type: Shield tunnel (underground fortification)

• Method: Surface-type construction

• Inner Diameter: 14,300 mm

• Total Length (L): 1,910.1 meters

• Purpose: To construct the underground regulating pond, including vertical shaft excavation and preparatory works for the first tunnel section.

The project was initiated under Toutiao Construction Engineering Co., Ltd.’s management framework and confirmed in the official contract documents on February 28, 2016. Evaluation metrics were determined to the fourth decimal place for precision in the scoring process.

Project Significance

The Ishigami River Underground Regulating Pond is a vital flood mitigation and stormwater management infrastructure designed to protect Tokyo’s urban districts from severe rainfall and river overflow. Utilizing advanced shield tunneling technology, the project exemplifies Japan’s precision engineering and integrated urban flood control strategy.

The award to Taisei-Kashima JV underscores their long-standing expertise in large-scale civil infrastructure, particularly in subterranean and hydraulic engineering.

Conclusion

With the contract awarded and preparatory work confirmed, the Ishigami River project is expected to advance Tokyo’s urban safety measures while demonstrating Japan’s continued excellence in engineering innovation and environmental sustainability.

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