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The "Metal Road Construction Method" is a three-dimensional frame prefabricated bridge where the piles, cross beams, and main beams are rigidly connected at the nodal points. It is mainly suitable for road construction on steep slopes in mountainous areas. We apply the appropriate structural type according to the terrain and construction conditions. We offer options such as the "Widening Type," "Mountain Side Cantilever Type," and "Independent Type." The suitable structural type is applied based on the terrain and construction conditions. 【Features】 ■ Excellent seismic resistance ■ Easy transportation and installation of components ■ Short on-site construction period ■ Widening possible while ensuring existing traffic ■ Consideration for the natural environment ■ Abundant track record *For more details, please refer to the PDF materials or feel free to contact us.

National Route 425 in Nara Prefecture is a road that facilitates regional exchange, connecting the city of Gobō in Wakayama Prefecture and the village of Totsukawa in Yoshino District, Nara Prefecture. However, there are continuous sections with narrow widths and poor alignment, making it difficult for vehicles to pass each other in many areas. Therefore, construction was carried out with the aim of eliminating narrow width sections, ensuring safe and smooth passage, and contributing to tourism promotion. The site is located within the area of the World Heritage Kumano Kodo, and due to the need for consideration of the landscape and the preservation of water channels, the metal road construction method was adopted. 【Case Overview】 ■ Client: Nara Prefecture, Gojō Civil Engineering Office ■ Construction Period: January 5, 2022 – June 30, 2022 ■ Total Length: 19.0m ■ Width: 6.95m *For more details, please refer to the PDF document or feel free to contact us.

Here is an example from the emergency road maintenance and reconstruction project ordered by Yamanashi Prefecture. The Fujikawa Minobu Line (Prefectural Road No. 10) is an important route designated as a second emergency transport road. The site had a thick alluvial fan layer, and existing structures (stone walls and drainage) were in close proximity, creating a challenging environment. As a result, the design and construction that could avoid interference with existing structures while ensuring traffic on the existing road was evaluated positively, leading to the adoption of the metal road construction method. 【Case Overview】 ■ Client: Yamanashi Prefecture, Kōnan Construction Office (Minobu Branch) ■ Construction Period: March 24, 2021 – August 31, 2022 ■ Total Length: 42.5m ■ Width: 7.0m (8.2m) *For more details, please refer to the PDF document or feel free to contact us.

Here is an example of the "Metal Road Construction Method" in Onagawa Town, Oshika District, Miyagi Prefecture. This method was adopted as part of the new road construction on the mainland side of the "Dejima Bridge Project," which connects the mainland to the islands. The construction site is surrounded by the sea and has access from only one direction, which allowed for the evaluation of hand-extended construction using a single push. Additionally, due to its coastal location, the design takes into account aesthetics and corrosion prevention. 【Case Overview】 ■ Client: Onagawa Town, Miyagi Prefecture ■ Total Length: 90.0m ■ Width: 7.7m ■ Number of Piles: 90 ■ Weight of Steel Pipe Piles: 152.8t ■ Weight of Girders: 428t *For more details, please refer to the PDF document or feel free to contact us.

A road widening project has been planned between the Tokyo Electric Power Company's Hozumi Power Station (Chikuma River intake weir) and the JR Koumi Line. The "Metal Road Method" was adopted due to its ability to arrange piles with consideration for existing structures, minimizing the impact of terrain alteration, and reducing the superimposed load on the supporting piles. Additionally, to mitigate the impact on adjacent structures from pile driving, a steel pipe pile continuous down-the-hole hammer method was employed. The construction was successfully completed. 【Project Overview】 ■ Client: Nagano Prefecture Saku Construction Office ■ Total Length: 43.5m ■ Width: 4.55-5.75m ■ Number of Piles Driven: 20 ■ Weight of Steel Pipe Piles: 19.4t ■ Weight of Beams: 33.7t *For more details, please refer to the PDF document or feel free to contact us.

This document introduces various examples of the "Metal Road Construction Method." It includes the construction work for the main body of the Komagome Dam in Aomori Prefecture, as well as the road improvement work for the Koiwai Motokoiwai Line in Saitama Prefecture. Images are also included, so please download and view them from the related catalog below. [Contents] ■ Aomori Prefecture: Komagome Dam Main Body Construction Work ■ Saitama Prefecture: Koiwai Motokoiwai Line Road Improvement Work ■ Yamanashi Prefecture: General Prefectural Road Takashita Kashizawa Line Road Improvement Work ■ Shizuoka Prefecture: (National) Route 136 Disaster Prevention and Safety Grant (National Road Reconstruction) Work ■ Wakayama Prefecture: National Route 480 Koyasan ■ Kumamoto Prefecture: National Route 445 (Kuzurese Work Section) Vitality Infrastructure Grant (Road Improvement) Work *For more details, please refer to the PDF document or feel free to contact us.

The "Metal Road Construction Method" is a robust frame structure that supports the road surface by connecting steel pipe piles and steel girders. Since it is not a wall structure, it is less affected by backwater. By embedding the piles into the supporting ground, it stably supports the road structure. Additionally, it allows for design considerations regarding the disappearance of failure layers such as landslides. Please feel free to contact us when you need our services. 【Three Reasons for Disaster Resistance】 ■ High durability structure ■ Supported by the bearing layer ■ Design based on disaster scenarios *For more details, please download the PDF or feel free to contact us.