Load Test of Load Test of High Capacity Micropile Micropile High - PowerPoint PPT Presentation

Load Test of Load Test of High Capacity Micropile Micropile High Capacity in Site in Site MASAO SAGARA MASAO SAGARA

Load Test of Load Test of NEW- -High Capacity High Capacity NEW Micropile Micropile MASAO SAGARA MASAO SAGARA

Contents Contents 1.Background(Construction Example of HMP) Background(Construction Example of HMP) 1. 2.Purpose 2.Purpose 3.Outline of NEW- -HMP HMP 3.Outline of NEW 4.Result of the Pull Out Test with NEW- -HMP HMP 4.Result of the Pull Out Test with NEW 5.Conclusion 5.Conclusion

Contents Contents 1.Background(Construction Example of HMP) Background(Construction Example of HMP) 1. 2.Purpose 2.Purpose 3.Outline of NEW- -HMP HMP 3.Outline of NEW 4.Result of the pull out Test with NEW- -HMP HMP 4.Result of the pull out Test with NEW 5.Conclusion 5.Conclusion

Design & Construction Manual for Seismic Retrofit Design & Construction Manual for Seismic Retrofit Method for the Existing Bridge Foundation Method for the Existing Bridge Foundation

Contents s Content Design & Construction Manual for Seismic Retrofit Method for the Design & Construction Manual for Seismic Retrofit Method for the Existing Bridge Foundation Existing Bridge Foundation � Part 1 : General Part 1 : General � � Part 2 : Design Part 2 : Design � � Chapter 1 : General Chapter 1 : General � � Chapter 2 : Material Chapter 2 : Material � � Chapter 3 : Surveys Chapter 3 : Surveys � � Chapter 4 : General Instructions Chapter 4 : General Instructions � � Chapter 5 : General Instructions for Seismic Retrofit Chapter 5 : General Instructions for Seismic Retrofit � � Chapter 6 : Elastic Design for Ordinary time and Level Earthquak Chapter 6 : Elastic Design for Ordinary time and Level Earthquake e � � Chapter 7 : Ductility Design for Level Chapter 7 : Ductility Design for Level Ⅱ Ⅱ Earthquake Earthquake � � Chapter 8 : Detail Chapter 8 : Detail � � Part 3 : Construction Part 3 : Construction � � Chapter 1 : General Chapter 1 : General � � Chapter 2 : Construction Procedures Chapter 2 : Construction Procedures � � Chapter 3 : Quality Control & Quality Assurance Chapter 3 : Quality Control & Quality Assurance �

Lecture ecture to engineers to engineers L about Design & about Design & Construction Manual Construction Manual

Contents Contents 1.Background Background(Construction Example of HMP) (Construction Example of HMP) 1. 2.Purpose 2.Purpose 3.Outline of NEW- -HMP HMP 3.Outline of NEW 4.Result of the pull out Test with NEW- -HMP HMP 4.Result of the pull out Test with NEW 5.Conclusion 5.Conclusion

Construction Example Construction Example Seismic Retrofit of KAMENOKO Bridge Seismic Retrofit of KAMENOKO Bridge Abutment A2 Abutment A1

Construction Example Construction Example Seismic Retrofit of KAMENOKO Bridge Seismic Retrofit of KAMENOKO Bridge � small bridge; small bridge; � � 14m in length 14m in length � � 6m in width. 6m in width. � � There is a soft soil layer There is a soft soil layer � over 10m in depth. over 10m in depth. � The influence on the The influence on the � Abutment A1 Abutment A2 house by the vibration house by the vibration of a large- -scale scale of a large machine was worried. machine was worried. � HMP with a small HMP with a small � machine was applied. machine was applied.

Construction Example Construction Example Seismic Retrofit of KAMENOKO Bridge Seismic Retrofit of KAMENOKO Bridge � HMP penetrated HMP penetrated � through the abutment. through the abutment. � Amount of piles Amount of piles ： ： � term ;17.5 ｍ 12piles, piles, term ;17.5 ｍ× × 12 16.5 ｍ 14piles, Total piles, Total 16.5 × 14 ｍ× 476m 476m Abutment A2

Construction Example Construction Example Seismic Retrofit of KAMENOKO Bridge Seismic Retrofit of KAMENOKO Bridge Construction situation Construction situation Abutment A2 Abutment A1

Construction Example Construction Example Seismic Retrofit of KAMENOKO Bridge Seismic Retrofit of KAMENOKO Bridge Construction situation Construction situation (digging) (digging) Abutment A2

Construction Example Construction Example Seismic Retrofit of KAMENOKO Bridge Seismic Retrofit of KAMENOKO Bridge Construction situation Construction situation (digging) (digging) Abutment A1

Construction Example Construction Example Seismic Retrofit of KAMENOKO Bridge Seismic Retrofit of KAMENOKO Bridge Finished construction Abutment A1

Construction Example Construction Example Seismic Retrofit of KAMENOKO Bridge Seismic Retrofit of KAMENOKO Bridge Finished construction Abutment A2

On the other hand… … On the other hand Recently, the intersection in Recently, the intersection in the city always gets a traffic the city always gets a traffic jam. jam.

It is necessary to overpass the It is necessary to overpass the intersection in Japan intersection in Japan When the overpass is constructed without stopping the car in the city, an enough construction place might not be able to be secured. Then, the application of HMP is expected as a new foundation. We need the Recently, the intersection in overpass of the the city always gets a traffic intersection to cancel jam. the traffic jam.

Application E Example xample to to O Overpass verpass of of Application HMP HMP HMP

Application to Abutment Application to Abutment Foundation Foundation

Problem and Measure Problem and Measure � Problem Problem � � It is important that the overpass can be constructed cheaply and early. � But HMP is necessary to construct a lot of pile as a new foundation of the abutment or the pier. � Measures Measures � � Then, HMP is improved so that the bearing capacity may increase. � As a result, the total number of the HMP can be decreased. � Moreover, the construction period can be short and the cost can be made down.

Contents Contents 1.Background(Construction Example of HMP) Background(Construction Example of HMP) 1. 2.Purpose 2.Purpose 3.Outline of NEW- -HMP HMP 3.Outline of NEW 4.Result of the pull out Test with NEW- -HMP HMP 4.Result of the pull out Test with NEW 5.Conclusion 5.Conclusion

Purpose Purpose � Bond length of HMP is only bearing layer. � We propose HMP of the improvement type by which the whole area of the pile is bond length to increase the bearing capacity. This is called NEW-HMP. � We executed the pull out load test of NEW-HMP, and confirmed the bearing capacity. � I describe result of pull out test.

Contents Contents 1.Background(Construction Example of HMP) Background(Construction Example of HMP) 1. 2.Purpose 2.Purpose 3.Outline of NEW- -HMP HMP 3.Outline of NEW 4.Result of the pull out Test with NEW- -HMP HMP 4.Result of the pull out Test with NEW 5.Conclusion 5.Conclusion

Improvement of HMP Improvement of HMP Top Pl at e Top Pl at e New Type Foot i ng � New New- -HMP HMP � � Diameter is Diameter is D r i l l i ng casi ng � larger than HMP. larger than HMP. C oupl er f or St eel pi pe � Bond length of Bond length of � Sof t G r ound NEW- -HMP is HMP is NEW C oupl er f or Def orm ed Bar longer than that longer than that Bond St eel pi pe of HMP. of HMP. C ent r al i zer Lengt h Lengt D r i l l i ng Bi t h Bond Def or m ed Bar G r out Bear i ng G r ound HMP NEW-HMP Bond length of HMP is only bearing layer. Whole area of the NEW-HMP is Bond length.

Construction Process of NEW- -HMP HMP Construction Process of NEW ① Excavation ② ③ ⑥ (casing boring) Washing in hole Insertion of ④ ⑤ Remove temporary ⑦ ⑧ 9-5/8in. Steel Pipes & reinforcement 7in. Insertion of Inject grout Treatment of I ni ti al i nj ecti on casing (outside diameter Remove inner drill steel pipe(outside deformed bar ( Unti l over f l owi ng) under pile head 244.5, inside diameter bit & rod diameter178 ㎜ ) pressure 220.5 ㎜ ) deformed bar gr out Sof t Layer Length Bond Bear i ng Layer

Construction situation Construction situation

Construction situation Construction situation

Construction situation Construction situation

Contents Contents 1.Background(Construction Example of HMP) Background(Construction Example of HMP) 1. 2.Purpose 2.Purpose 3.Outline of NEW- -HMP HMP 3.Outline of NEW 4.Result of the pull out Test with NEW- -HMP HMP 4.Result of the pull out Test with NEW 5.Conclusion 5.Conclusion