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Application of High-capacity Micro-piles for Seismic Retrofitting of Water Service Tower in Japan

This study explores the use of high-capacity micro-piles for retrofitting an existing water service tower in Japan to improve its earthquake performance. It discusses the preliminary survey, design, and construction process, as well as the evaluation of the seismic performance of the micro-piles. The study also examines the seismic design considerations and provides examples of seismic performance measurements.

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Application of High-capacity Micro-piles for Seismic Retrofitting of Water Service Tower in Japan

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  1. IWM ’03 Seattle Application of High-capacity Micro-piles for Seismic Retrofitting of Existing Water Service Tower in Japan Yoshinori Otani Hirose & Co., Ltd. Masaru Hoshiya Musashi Institute of Technology Sep.25th 2003

  2. Contents • HMP Okazaki Example　( RC Water Service Tower )　　　　 Preliminary　Survey Design Construction • Evaluation of Earthquake Performance of HMP by Acceleration Seismograph’s Measuring　　　　　　　　　　　　　　　　　　　　　　　　　　　

  3. Location Location of the Site Rokku　Water　Purification　Plant Tokai Plate Boundary Type Earthquake

  4. Water Service Tower • Constructed in 1933 70 years old 　　　　　　　　 • Historic Significance Urban Landscape and Environment Prize • Functioning for water supply

  5. Section Planning S

  6. Design Flow Chart Preliminary survey Verification of existing tower Selection of retrofitting method Seismic design (level 1) Level 1:earthquake motion of high occurrence probability Seismic design (level 2) Level 2:earthquake motion with the strong 　　intensity of low occurrence probability type Ⅰ:Plate boundary type large-scale earthquake type Ⅱ:Inland direct strike type earthquake

  7. Preliminary Survey • Schmidt Hammer Test for Existing Concrete Material 　 Stress strength 24 kN/m2 • Degree Investigation of Visual Observation Corrosion of the steel reinforcement bars , Cracking Water leakage, Surface deterioration • Diagnosis Conducted to Classify Deterioration

  8. Design（１） Verification of existing tower • Micro pile 　 Construction limit (Root pile) Small boring machine • HMP Satisfaction of allowable displacement (Level 2 earthquake motion) High-capacity Selection of retrofitting method

  9. Seismic Design Design of pile Response displacement method Verification　of pile foundation Level１：Allowable bearing capacity Allowable stress Level 2： Allowable ductility factor Allowable response displacement Strength Design Coefficient Yield of foundation Yield Coefficient Response displacement

  10. Construction(1) Protection ofvegetation Excavation of the base Placing of HMP Placing of HMP

  11. Construction(2) Attachment of steel pile head Reinforcing bar arrangement Reinforcing bar arrangement of new footing Pile Head

  12. Completed work

  13. Disaster Prevention Plan The central disaster prevention conference Basic disaster plan Regional disaster plan Prime Minister Koizumi Tokai Earthquake High probability of occurrence Large scale earthquake

  14. Disaster Strengthening Area • Earthquake Motion of Seismic Intensity low 6 • Tsunami Disaster Strengthening Area HMP Examples in Disaster Strengthening Area for Tokai Earthquake

  15. Measurement Plan Bisyamon bridge Acceleration　Seismographs

  16. Purpose of Measurement Expected vibration behavior of non-reinforced abutment Seismograph on the ground surface Comparison The actual measured values of reinforced abutment Seismograph on the abutment Seismic performance of HMP

  17. Summary and future plans • HMP Method ( for reinforcing of the existing structures) respond ・to revisions in the seismic design standard ・to changes in the demands of society by way of non-detrimental to the landscape • In the future, confirm ・the actual seismic performance of HMP by seismograph measurement

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