Prestressed Concrete Bridge Superstructures
Okukubi River Bridge Renewal Project of Reinforced Concrete Hollow Slab Bridge , Okinawa Prefecture.
The bridge completed in 1975 had become obsolete. Before the revamp work commenced, the original decks of the bridge had apparently deteriorated due to contamination of salt and other harmful foreign matters contained in the materials during the early stage of the initial construction. This is the first large scale revamp project of an existing reinforced concrete bridge to be modified and renewed into a prestressed concrete hollow slab bridge on a main expressway by SCBR Method.
Yahagi River Bridge on Shin Tomei Expressway, Aichi Prefecture.
This is the world's first hybrid type of prestressed concrete and steel corrugate cable-stayed bridge. The 235-meter main span and 820-meter overall length is the world's longest of this type of hybrid bridges. The 43.8-meter wide main girders were erected with very large transporters.
Shiba River Bridge on Shin Tomei Expressway, Shizuoka Prefecture.
It is to this bridge for the first time in Japan that were applied main prestressed concrete box girders having the section of steel pipe struts supporting the cantilevered decks. The superstructures enjoy the light weight and, as a result, enable the piers and foundations to be simplified.
Kiso River Bridge on Shin Meishin Expressway, Mie Prefecture.
This is the world's first hybrid type of extradosed bridge of the continuous structure main span of the prestressed concrete and 100-meter steel girder at the center. The prestressed concrete girders, of which the largest segment weighs about 400 tons, were precast and transported by ship.
Tomita-Yamashiro Route Viaduct, Mie Prefecture.
This viaduct was constructed of precast concrete segments by the Span-by-span construction method to solve the chronic traffic congestions in the area. This fast erection method was applied to the phase I and II construction works that went on at the same time.
Kohbaru Deep Valley Bridge, Ohita Prefecture.
The overall length of this bridge is 236 meters and the span 135 meters. The OKK Lowering Method for concrete arch bridges was applied to this particular bridge. The Method had been for the first time applied in Japan to Uchinokura Bridge in Niigata Prefecture. This is our unique and original construction method disseminating in Japan.
Nozomi Bridge, Gifu Prefecture.
This bridge has a hybrid structure of prestressed concrete stress-ribbon deck and truss, built to provide access to the construction site of the New Maruyama Dam. The lower deck is separated from the abutments and integrated with the upper deck to form a truss girder which is supported by the suspension cables. The design of this bridge was aimed to enhance the conventional stress-ribbon deck bridge.
Morino-Wakuwaku Bridge, Fukusima Prefecture.
This is a prestressed concrete stress-ribbon bridge with the external cables having an overall length of 165.5 meters and a suspension span of 128.5 meters in the Iwaki Park, Fukushima Prefecture. This bridge is the symbol of the park for its aesthetic merit in the landscape.
Kurobe River Bridge on Railway of the Hokuriku Shinkansen High Speed Railway
This is the world's first railway bridge of the hybrid type of prestressed concrete box girders and corrugated steel webs built on the Hokuriku Shinkansen High Speed Railway. This bridge attracted many people's attention for it was the first application of the said type to a railway bridge.
A 'Tsukuba Express' Bridge on the New Johban Railway
This urban high-speed railway line links Akihabara, Tokyo and Tsukuba City, Ibaraki Prefecture. The line has an overall distance of 58 km. For the length of around 9km in total of the railway, were built elevated simple U-shape composite structures of pretensioned prestressed reinforced concrete. Not only the structures, but our original designed prestressed concrete sound insulation walls were installed to the facilities. The railway started its commercial operation in August, 2005.
