Road Development and Management

Structures (Bridges, Special Structures, and Analysis / Experiments) and Maintenance (Inspections and Repair / Reinforcement Design)

Bridge design taking into account future maintenance and management, aesthetics, and maintenance cost

In the modern world where needs are diversified, people have various demands for bridges, too. They must have an aesthetic appeal, low environmental impact, and low lifecycle cost. In order to meet these needs, we are forward-looking in our use of new technologies, construction methods, and techniques as we plan and design bridges that can be passed on to future generations.

Analysis and experiments regarding the performance of noise barriers in stopping falling objects

With the aim of preventing falling objects from hitting expressway noise barriers and falling off the road, we combined analysis and experiments to carry out improvement studies to improve the performance of noise barriers in stopping falling objects.

Yokohama Northwest Route projects (Kohoku JCT, main line, and Aoba JCT)

We implemented numerous bridge designs for the Yokohama Northwest Route of the Metropolitan Expressway that links the Tomei Expressway and the Daisan Keihin Road, considering the constraints and environmental conditions within the city. (Awarded the Japan Society of Civil Engineers’ Tanaka Prize for Kohoku JCT)

Komono Second Viaduct West

Taking harmony with the surrounding environment as its basic concept, the bridge was designed to give the shape of the bridge as a whole a sense of unity when seen from a distance and to keep it from overpowering the landscape when seen up close. Measures were also implemented to facilitate maintenance with respect to keeping the bridge clean. (Awarded the Japan Society of Civil Engineers’ Tanaka Prize)

Reinforcement design for the Katsushima section of Metropolitan Expressway Route 1 Haneda Line

We carried out large-scale repairs, including making continous the cantilever structural sections of the 3-span continuous PC box girder bridge that was opened around the time of the 1963 Tokyo Olympics, and adding new piers to sections that could not be made continuous, in a design that greatly improves future maintainability. (Awarded the Japan Society of Civil Engineers’ Tanaka Prize)

Dejima Omotemon Footbridge

This is a pedestrian bridge designed jointly with an overseas consultant using the latest technologies, as part of the Nagasaki Dejima restoration project. The bridge is of a special structure, jutting out from the opposite bank so as not to put any load on Dejima, a historical heritage site. (Awarded the Japan Society of Civil Engineers’ Tanaka Prize, the 2018 Good Design Award)

Onahama Marine Bridge

This is a 927 m long harbor road bridge constructed in Onahama Port in Iwaki City, Fukushima Prefecture. The main bridge section which straddles the channel is a 5-span continuous PC extradosed bridge, the first bridge of this type introduced in Japan as a harbor road bridge. The bridge was designed to be a landmark of Onahama Port and the surrounding area, with consideration given to harmony with the surrounding environment and to the landscape. As a marine bridge, it also incorporates measures to ensure durability against the harsh corrosive environment and ease of maintenance.