Technologies to Improve the Seismic Performance of Existing Bridges
First written in FY2019. 7 of 8 entries say "Advanced", first in FY2020. Latest entry: FY2026.
3 other companies' latest entry also says "Advanced".
- FY2026AdvancedAnnual report
「Going forward, we plan to conduct large-scale experiments at E-Defense, one of the world's largest three-dimensional earthquake testing facilities, as part of joint research with the Public Works Research Institute and other organizations.」
For friction dampers for existing bridges, the company has progressed to plans for expanding sales and applications following adoption in actual construction projects, as well as large-scale experiments at E-Defense. - FY2025AdvancedAnnual report
「In the fiscal year ending March 2025, to strengthen field support for friction dampers (joint type at both ends), we conducted performance verification tests at subzero temperatures and confirmed that the dampers have excellent performance with low temperature dependence. We are currently preparing a report on the test results.」
For friction dampers for existing bridges, performance was verified at subzero temperatures, confirming low temperature dependence. In the following fiscal year, research aimed at expanding sales and applications is planned. - FY2024AdvancedAnnual report
「In the fiscal year ending March 2024, ultimate strength verification tests and slide-section verification tests were conducted, and the data required for design was obtained. In the fiscal year ending March 2025, after conducting a detailed analysis of the test data, we plan to prepare various manuals and commercialize the technology.」
The new mechanism for friction dampers for existing bridges has progressed from obtaining design data to plans for preparing manuals and commercializing the technology in the following fiscal year. - FY2023AdvancedAnnual report
「In the current fiscal year, as the second phase of implementation, installation work for 24 1200kN friction dampers and 2 800kN friction dampers on Metropolitan Expressway Route 1 Ueno Line was completed. …In the fiscal year ending March 2023, a large-scale shaking-table test was conducted, demonstrating that the slide mechanism operated properly under conditions reproducing actual seismic motion.」
The second friction damper construction project for bridges was completed, and proper operation of the new slide mechanism was demonstrated through a large-scale shaking-table test. - FY2022AdvancedAnnual report
「We are also developing a new mechanism that eliminates the effects of seismic motion in the bridge-axis direction on the direction perpendicular to the bridge axis, enabling installation at all types of bearing sections. In the fiscal year ending March 2023, we plan to verify that the mechanism developed operates properly under actual seismic motion through dynamic loading tests using a large shaking table under conditions close to those of an actual bridge.」
For friction dampers for existing bridges, a new mechanism to expand the scope of application and a verification plan using a large shaking table in the fiscal year ending March 2023 have been added. - FY2021AdvancedAnnual report
「In the next fiscal year, 24 1200kN friction dampers and 2 800kN friction dampers are scheduled to be installed on Metropolitan Expressway Route 1 Ueno Line.」
For friction dampers for existing bridges, the company has not only a track record of adoption in actual construction projects but also plans to install 24 1200kN units and 2 800kN units in the next fiscal year. - FY2020AdvancedAnnual report
「As a result, 1000kN and 650kN friction dampers were installed on Metropolitan Expressway Route 11 Daiba Line, marking the first adoption in an actual construction project.」
Friction dampers were adopted for the first time in an actual construction project as a technology for improving the seismic resistance of existing bridges. - FY2019First statedAnnual report
「Regarding the joint research theme “Research on Technologies to Improve the Seismic Resistance of Existing Bridges,” solicited by Metropolitan Expressway Company Limited in June 2013, we are conducting research on applying friction dampers to existing bridges.」
Joint research, durability testing and dynamic analysis are being conducted on the application of friction dampers to existing bridges.