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Reinforcement of Scoured Pile Group Bridge Foundations with Spun Micro Piles
This article demonstrates an approach to reinforce the bridge’s foundations, of which its safety factor had been reduced to a dangerous level by scouring, with the use of spun micro piles. The bridge was built more than 30 years ago at Dong Pa Lan, Mae Fai Subdistrict, San Sai District, Chiang Mai Province, Thailand. The Department of Rural Roads investigated the existing piles’ lengths embedded in the soil using Parallel Seismic Test and then recalculated the capacity of the foundations. The calculation suggested that one of the foundations had a safety factor of 1.04, which was considered extremely dangerous from a geotechnical engineering aspect since a value higher than 3.0 is typical. A collapse would occur if the bridge was subjected to more scour and traffic without reinforcement. The department examined a few solutions to the problem considering limitations on the construction space, necessity of traffic during the repairing process, cost, and safety for the construction, and then decided to reinforce the foundations with spun micro piles. The process began with pressing the piles around the old foundations into the stiff soil layer by using hydraulic jacks. The weight of the superstructure was transferred by temporary steel structures to the new micro piles. The bridge was then lifted a little to pre-load the piles. Finally, concrete columns reinforced with steel tubes were cast to connect the old foundations with the micro piles. The result suggested that the spun micro piles were able to support the weight of the bridge and complied with the design criteria and engineering standards.
Reinforcement of Scoured Pile Group Bridge Foundations with Spun Micro Piles
This article demonstrates an approach to reinforce the bridge’s foundations, of which its safety factor had been reduced to a dangerous level by scouring, with the use of spun micro piles. The bridge was built more than 30 years ago at Dong Pa Lan, Mae Fai Subdistrict, San Sai District, Chiang Mai Province, Thailand. The Department of Rural Roads investigated the existing piles’ lengths embedded in the soil using Parallel Seismic Test and then recalculated the capacity of the foundations. The calculation suggested that one of the foundations had a safety factor of 1.04, which was considered extremely dangerous from a geotechnical engineering aspect since a value higher than 3.0 is typical. A collapse would occur if the bridge was subjected to more scour and traffic without reinforcement. The department examined a few solutions to the problem considering limitations on the construction space, necessity of traffic during the repairing process, cost, and safety for the construction, and then decided to reinforce the foundations with spun micro piles. The process began with pressing the piles around the old foundations into the stiff soil layer by using hydraulic jacks. The weight of the superstructure was transferred by temporary steel structures to the new micro piles. The bridge was then lifted a little to pre-load the piles. Finally, concrete columns reinforced with steel tubes were cast to connect the old foundations with the micro piles. The result suggested that the spun micro piles were able to support the weight of the bridge and complied with the design criteria and engineering standards.
Reinforcement of Scoured Pile Group Bridge Foundations with Spun Micro Piles
Sustain. Civil Infrastruct.
Akhnoukh, Amin (editor) / Kaloush, Kamil (editor) / Elabyad, Magid (editor) / Halleman, Brendan (editor) / Erian, Nihal (editor) / Enmon II, Samuel (editor) / Henry, Cherylyn (editor) / Wachiraprakarnpong, Apichai (author) / Kraikuan, Juti (author) / Watcharakornyotin, Jirasak (author)
International Road Federation World Meeting & Exhibition ; 2021 ; Dubai, United Arab Emirates
2022-04-21
15 pages
Article/Chapter (Book)
Electronic Resource
English
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