Social contributions
Post-disaster recovery work
Construction and dismantling of temporary bridges used as detours when replacing aged bridges, as well as working platforms and temporary bridges for construction on civil engineering and building construction sites. When a bridge is damaged or becomes unusable due to an earthquake or heavy downpour disaster, a temporary bridge is constructed as part of post-disaster recovery.
Post-disaster recovery temporary bridge installation work
When a bridge collapsed or a road was cut off due to a disaster, we quickly install a temporary bridge to facilitate recovery work.
Our Works
HIROSE & CO., LTD.
Single-operation erection to reduce construction time
Pre-girder® bridge
- Owner:
- Ministry of Land, Infrastructure, Transport and Tourism, Tohoku Regional Development Bureau, Minami-Sanriku National Highway Office
- Site:
- Kesen Ohashi, National Highway 45, Kesen-cho, Rikuzentakata-shi, Iwate Prefecture
- Disaster:
- Great East Japan Earthquake
The Kesen Ohashi Bridge, which connects Rikuzentakata to Miyagi Prefecture and is an important transportation route for logistics and tourism promotion, was completely destroyed by the tsunami that followed the Great East Japan Earthquake on March 11, 2011. We constructed a piled jetty for construction (36-metre-span Pre-girder® bridge) to promptly provide a transportation route toward recovery using a single-operation erection method, where cranes were used for spans on both sides and a barge crane for the central span, thereby shortening the construction period by 45 days and allowing the temporary bridge to open to car traffic in 75 days. Then, in the recovery project, the bridge was constructed higher than the one existing before the disaster to avoid tsunami damage, and on December 7, 2018, seven years and nine months after the disaster, the Kesen Ohashi was completed to provide safe and secure access by the local community.
HIROSE & CO., LTD.
Launching erection to reduce construction time
G-piled jetty® (II, IB)
- Owner:
- Miyagi Prefecture, Eastern Civil Engineering Office
- Site:
- Shin-Kitakami Ohashi, National Highway 398, Kitakami-cho, Ishinomaki City, Miyagi Prefecture
- Disaster:
- Great East Japan Earthquake
The Shin-Kitakami Ohashi Bridge, located 4m upstream from the mouth of the Kitakami River, a first class river, was affected by the tsunami that followed the Great East Japan Earthquake in March 2011, when two-span girders of 150 m on the left bank were washed out and the remaining five spans were damaged. We constructed the G-piled jetty® (12 spans with a width of 8 m) to promptly provide a transportation route toward recovery using a launching erection method, which can reduce the number of substructure bearing piles and ensure safe delivery by attaching them to the girder end, thereby shortening the construction time by 50 days and allowing the bridge to open to traffic in 90 days. Despite the catastrophic situation, we completed an emergency piled jetty in a short period of road closure to help the local community. The bridge project was then completed in October 2016.
Companies available for construction
Please see the websites of the respective companies for details of the projects and methods.
