Is it just a bridge? Not quite. The Tomobuchi Bridge in Osaka is more than just a way to cross the river. It carries a fascinating history.
Let’s dive into the story of this bridge also known as Tomobuchi bashi. It is located in Miyakojima Ward of Osaka City.
Back in Showa 13 or 1938, the original Tomobuchi Bridge was built. It was a simple steel girder bridge. This first bridge connected the Sonezaki River and the Okawa River. The Okawa River was then known as the Old Yodo River. It was part of the old Yodo River mouth of the Konaka Canal.
This canal is now called the Ichiji River. New river improvements are underway. The bridge was built in 1938. This was a time when bridges over the same canal were being converted to permanent bridges. Many of these used steel girders. Some even used composite girders.
In Showa 33 or 1958, the current Tomobuchi Bridge was rebuilt. This bridge was innovative for Osaka City. It was the first two-span continuous composite girder bridge in the city. Continuous composite girders were popular in Germany. They suited the extension of composite girder spans. But at the time, they were not common in Japan.
This Tomobuchi Bridge became the foundation for later composite girder developments. This type of bridge avoids tensile stress in the concrete slab. This is done by negative moments.
The design requires prestressing in areas where the allowable tensile stress is exceeded. This technique is also used in other girder bridges. For example, the Gerber and Rahmen bridges.
Later, in Showa 47 or 1972, the bridge was widened. This was due to increased traffic. A pedestrian bridge was added to ensure pedestrian safety.
Today, the Tomobuchi Bridge stands as a testament to Osaka’s engineering history. It is a reminder of the city’s progress and innovation. The bridge is 30.40 meters long and 8.00 meters wide. The bridge can be accessed from the Tanimachi Line Miyakojima Station. It is about 1100 meters from Exit 4. This is about a 19-minute walk. Alternatively, you can take the Osaka City Bus to the “Kebama Bridge” stop.
So, as you cross the Tomobuchi Bridge, remember its story. Remember the engineering and the people who made it possible. It is a vital part of Osaka’s landscape.