Our Projects

Karisaka-Ohashi Bridge is located on National Highway 140, the only national highway connecting Saitama and Yamanashi Prefectures. As part of an earthquake reinforcement project for the emergency transportation road we replaced the bearings and installed displacement prevention devices. The work was carried out under difficult conditions, as it is a truss bridge located in a gorge, which made the transportation and installation of reinforcement parts challenging. Nevertheless, the project was completed with no accidents or incidents, and received high praise from the client.（2024）

We installed bridge girders in Kozakai Overpass on National Highway 247 in Toyokawa City, Aichi Prefecture, in order to widen the overpass to alleviate congestion where the national highways intersect. We installed 17 main girders, each with a length of 25 meters. Unlike new construction, this work required high levels of precision as the new girders had to be integrated into the existing overpass, but through thorough construction management, the project was completed with no accidents or incidents, and received high praise from the client.（2024）

We completed repair works for four pedestrian bridges, including Shintokai-bashi Pedestrian Bridge and Ryogoku Bridge, as well as three other bridges that are integral to the local community (the photo shows Shintokai-bashi Pedestrian Bridge after repainting and waterproofing coating). Due to the nature of working on multiple sites, complex process management and safety controls were required. However, through close and ongoing consultations with the client, we completed the project safely, with no accidents or incidents, and received a commendation for excellent work from the Director of the Tokyo National Highway Office.(2024)

On the Metropolitan Expressway Route No. 6 Mukojima Line, we carried out a large-scale bridge repair project spanning approximately seven years, covering a distance of 950 meters and 23 spans. The work included deck slab reinforcement, bearing replacement, and repainting. Despite the urban-specific challenges, such as working above the Sumida River, on metropolitan roads, and at Ryogoku Junction and park areas, we completed the project without any accidents or incidents. In recognition of this, we received commendations for excellent work and outstanding safety management from Metropolitan Expressway Co., Ltd.(2024)

On the viaduct between Isewangan Expressway’s Toyota-higashi Interchange and Tobishima Interchange, we engaged in six rounds of centralized work over a period of approximately four years in carrying out replacement of 23 expansion joints with the aim of enhancing fatigue durability. Although the work was continuous day and night with lane restrictions on the expressway, we successfully completed the work without accidents or mishaps by responding flexibly to the changes from day to day. We accordingly received a certificate of appreciation from Central Nippon Expressway Company Limited for these efforts.（2023）

The Sone Viaduct is an elevated bridge on Himeji Bypass of National Highway 2 crossing the Harima coastal area. The work mainly involved installation of horizontal force allocation structure to improve seismic resistance. Whereas the project called for particularly stringent safety controls given that construction took place above National Highway 250 as it remained in operation, we successfully completed the project without any accidents or mishaps and accordingly received commendation for excellent work from the Director of the Himeji Office of River and National Highway affiliated with the Kinki Regional Development Bureau of the Ministry of Land, Infrastructure, Transport and Tourism.（2023）

The Kinegawa Bridge Viaduct is a bridge connected to the Kinegawa Bridge spanning Arakawa, a class A river. As part of seismic work, we replaced the bearing, reinforced bridge piers, and installed bridge falling prevention devices. Although this work was carried out under difficult conditions in a river area where excavation around the bridge piers was performed during the dry season and many processes involved using heavy machinery in the narrow space below the girders, we were able to complete the project without accidents or mishaps, and received high praise from the client.(2022)

On the viaduct between the Najima ramp entry/exit and the Kaizuka junction, we carried out the reinforcement of deck slabs with carbon fiber, repainting of steel girders, and concrete spalling prevention with bridge piers and concrete bridge barriers as deterioration measures and preventive maintenance. Although this work was carried out under difficult conditions involving repeated scaffolding assembly and disassembly at night, we were able to complete the project on schedule within approximately three years, without any accidents or mishaps, and received high praise from the client.(2022)

The Group received an order by a joint venture for renewal project construction for a highway where bridge deck slab exchange and tunnel repair are carried out simultaneously. The Company was in charge of repair work for 22 tunnels interspersed over 66 km, and carried out bonding of carbon fiber lining, void filling for the back surface of lining, etc. The Company completed three years of construction without any accidents or mishaps, and received the Commendation for Excellent Construction by East Nippon Expressway Company Limited.(2022)

The Group carried out seismic retrofitting work for Asahi Kokakyo, viaduct, which spans National Highway 15, part of the course for the Hakone Ekiden.
Although construction was carried out under difficult conditions while using parking lot under the viaduct, the fact that the Group completed construction without any accidents or mishaps due to the proposal of a construction method that minimizes the impact to users was rated highly, and received the Director-General’s Commendation for Excellent Construction and Excellent Construction Engineers from the Kanto Regional Development Bureau of the Ministry of Land, Infrastructure, Transport and Tourism.(2022)

The Oi-Hokubu Overpass in Shinagawa-ku, Tokyo, is an overpass comprised of four ramp bridges. Construction of this overpass was completed in 1973, ahead of the opening of the Oi Container Terminal. Because aging of the deck slabs had progressed due to the extremely large traffic volume of large vehicles, construction was carried out to remove all the existing deck slabs and install new deck slabs. Although construction was carried out while the overpass was closed to traffic around the clock, we were able to complete the construction prior to the Tokyo Olympic Games without any accidents or mishaps, and received high praise from the client. (2021)

The Karasuyama Viaduct is a bridge located between the Takaido Interchange and the Chofu Interchange of the Chuo Expressway. The main construction work was linking concrete girders using external cables and eliminating expansion joints above the bridge piers in order to construct a structure to prevent the bridge from falling during an earthquake. Because there were residential areas near the construction zone, which was approximately 1 km long, we implemented noise control and other measures in consideration of those living in the surrounding area. In addition, although the construction required a long period of four and a half years, we completed the construction safely and successfully, and received high praise from the client.(2021)