Contents of construction to be carried out this time
Expressway In order to keep the functioning of the network healthy for a long period of time, we will reinforce the steel deck slab of Yukonbashi where fatigue cracks occur due to vehicle load by steel fiber reinforced concrete pavement.
- Construction of the deck repair work
- As a countermeasure to the fatigue crack of the steel deck, replace part of the pavement on the steel deck with durable concrete (SFRC: steel fiber reinforced concrete).
- Glossary 【Slab version (Shoban)】
- It is a structural section that directly supports cars etc. passing through bridges and transmits the load to the girders.
In the bridging section of the outer annulus, we use the steel deck (see the figure below) in some sections.
The outer annulus has been in operation for more than 25 years since the opening in 1992, during which fatigue cracks of the steel deck were discovered by inspection due to the increase in wheel load due to the larger size of the vehicle. Fatigue cracks that occur in the steel deck will penetrate the steel deck if left untreated, which in worst case will result in a collapse of the road surface, which may impair safety.
Therefore, repairing the crack before the fatigue crack progresses, and replacing the lower part of the asphalt pavement with rigid concrete (SFRC: steel fiber reinforced concrete), construction to extend the life of the bridge will be done Thing.