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Current Status of Japanese Road Bridges and Future Perspective

Current Status of Japanese Road Bridges and Future Perspective. HIROAKI TERAMOTO Ministry of Land, Infrastructure and Transport. Numbers of bridges by type of material ( only bridges over 15m ). Distribution of bridges for completion year. Road Work Budget in JAPAN (2005). Maintenance

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Current Status of Japanese Road Bridges and Future Perspective

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  1. Current Status of Japanese Road Bridges and Future Perspective HIROAKI TERAMOTO Ministry of Land, Infrastructure and Transport

  2. Numbers of bridges by type of material(only bridges over 15m)

  3. Distribution of bridges for completion year

  4. Road Work Budget in JAPAN (2005) Maintenance & repair ￡1.44 billion National Road Projects ￡11.47 billion (22.5%) Construction, operation & others Total investment in road projects in JAPAN ￡50.96 billion (100%) Projects undertaken by local governments ￡30.65 billion (60.1%) Operation of Toll Roads ￡　8.84billion (17.4%)

  5. National Highways Maintenance Budget(2005) Repair work for Structure: (35%) Repair of bridges and tunnels, Pavement Daily Maintenance : (13%) Road cleaning, Planting etc. Maintenance ￡1.10 Billion ( 77 %) Road Patrol : (9%) Minor Repair Work : (18%) Repair for retaining walls, drains etc. Maintenance and Repair (￡1.44Billion) Others : (2 %) Emergency restoration for disasters Improvement ￡0.33 Billion (23%) Countermeasures for earthquakes : (11%) Reinforcing of substructures, Prevention for bridge fall Disaster prevention : (12%) Slope protection

  6. Type of Inspection in JAPAN Usual Inspection Periodic Inspection Special Inspection （Salt Damage, ASR, Fatigue…） Disaster Inspection ( Earthquake, typhoon…)

  7. Damage of Road Bridges in JAPAN (the Results of Periodic Inspection)

  8. Fatigue cracks on girder

  9. Breaking of reinforcing bars by ASR Damaged gas pressure weld point (main reinforcements) Breaking at corner of the shear reinforcement

  10. Dropping-off of concrete of RC Slab

  11. Theothers 6.8% Cracking and peeling of concrete (Chloride attack) 16.7% Corrosion ofsteel member 26.0% Cracking and peeling of concrete 50.0% Damage of RC slab 67.2% Damage of RC slab 33.3% Causes for bridge reconstruction (National highways and prefectural roads) Steel bridgesPC bridges

  12. Chloride damage of PC girder

  13. Tokyo to Tsukuba 50km Tokyo to Osaka 560km latitude Monsoon Rome N S Tsukuba Narita Airport Tokyo Kyoto Osaka Kansai Airport Air Salt in Winter (climate)

  14. Maintenance cost for a deteriorated concrete bridge

  15. Prediction by the results of Inspection (example) Chloride Damage in concrete at cover depth • If Cl- exceeds 1.2kg/m3 or will exceed 1.2kg/m3within next 10 years, Planning of Repair should be undertaken.

  16. Relation between type of repairs and cost Case 1：Preventive repair (Minimizing Life Cycle Cost) Case 2：Repair at the repairable limit state Soundness Small repair Small repair Cost Case 1 Case 2 Large repair Case 2 Case 1 T₁ T₂ T₃ year Evaluation period T₁ T₂ T₃ year Evaluation period

  17. Asset Management Flow of Bridges Maintenance Properties of structure Bridge Dimensions Inspection Database Evaluation of Present Soundness Prediction of Future Soundness Comparison of Type of Measures,Minimizing of Life Cycle Cost,Budget Restriction / Social Situation Investment Analyzing Risk based Prioritization Decision of Management Plan Execution of Measures or Maintenance

  18. SUMMARY( Needs in JAPAN) (1) Inspection of Local Road Bridges ( needs to make a New Act/Law) (2) Improve the Forecast Model of Deterioration ( the Methods of Life Cycle Cost Analysis ) (3) Develop Non-Destructive Test Techniques (4) Develop Prioritization System of Maintenance (5) Make the Market of Maintenance-Works more Attractive and Profitable

  19. Thank you for your attention! END

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