Proceedings - 13th International Workshop on Micropiles - 2017, Vancouver, BC, Canada, (ISM, DFI, ADSC)
PRELOADING AND HEAD CONNECTION METHOD FOR MICROPILE
Je-Yong Park, Changho Choi, Hyun-Sik Yu, Hee-Jeong Yang, Ki-Hwan Lee
Micropiles are used extensively for underpinning or retrofit of existing foundations. In some cases, micropiles must be preloaded to reduce excessive settlements and to prevent overloading of the existing foundations when the new or additional load is applied. In this aspect, the preload must be properly and permanently locked in the head of micropiles. This paper describes a newly developed preloading and head connection method for micropile, provides a means of more efficiently enhancing the micropile-to-footing connection capacity and increasing the load carried by micropiles. An experimental study was conducted to investigate the total capacity of the micropileto- footing connection. The results of tests showed that the developed micropile preloading systems (i.e., steel cone and split-threaded wedges) could provide costeffective engineering solution for strengthening existing foundations and increase the structural capacity of the micropile-to-footing connection.
|article #2653; publication #1033 (ISM- 2017)|