The Heiwa-ohashi Pedestrian Bridge Design Proposal Competition asks for two bridges as a key part in the renewal of the Peace Boulevard. The bridges have an important function providing access for many visitors to the Peace Memorial Park. The new pedestrian bridges harmonize with the existing bridge, the Isamu Noguchi handrails, the Motoyasu-gawa River, the Peace Memorial Park and the surrounding area.
I have worked as part of the team in developing the bridge from concept to detail. I have produced 2D drawings and 3D models, eventually finalizing the visualizations for the competition.
The Heiwa-ohashi Pedestrian Bridges are not to compete with the Peace Memorial Park nor obstruct the view of both the Atomic Bomb Dome and the railings of the Heiwa-ohashi Bridge. Hence the load bearing structure is placed below deck and above deck the structure is as transparent as possible with cantilevered glass handrails. The image of the proposed Heiwa-ohashi Pedestrian Bridge is one of a crane bird standing in the Motoyasu-gawa River with its outstretched wings gently touching the river banks.
The bridge is structurally a propped-up cantilever bridge. The shape of the bridge is a reflection of the flow of forces in the structure. The steel girder, acting as a torsion box, is cantilevered from the central pier. The girder is deepest above the peer and thins out towards each end. The tapering of the pier ensures maximum stability for the girder and minimum obstruction of the water flow. The upper part of the warped pier is in steel the lower in concrete.
The project reflects the best in Japanese architecture and design, simplicity and careful detailing, and in so paying the utmost respect to the Peace Memorial Park. The bridge is carefully crafted with the box girder’s varied cross section with twisted planes giving it a sweeping, airborne (lightweight) elegance. The shape having no double curved planes is easy to construct. The girder diaphragms protrude slightly providing for easy welding from the outside and enhancing the shape of the rolled, twisted planes. All steel have a paint protection system applied in a light, almost white colour.
Developed as part of a small team while working at Dissing+Weitling Architecture in Copenhagen, Denmark.