Installation of steel pipe piles and steel pipe sheet pile for bridge foundation using vibratory inner-excavation method (NB SYSTEM)

Conference paper
Part of the Lecture Notes in Civil Engineering book series (LNCE, volume 62)


The NB System is an inner-excavation pile installation method for steel pipe pile and steel pipe sheet pile using vibration equipment. The NB System drastically increases pile installation speed, as the vibration motion temporarily reduces the frictional resistance between the surface of pile and the surrounding soil. The NB System can be used to load-bearing layers that include rocks and boulders and to soft rock layers; it can be used to a maximum depth of about 90 m. The advantages of the NB System include improved installation accuracy, since it has possibility of extracting/correcting of install errors. Furthermore, the NB System can be used in areas where have environmental limitations, since its low vibration and noise emissions, and vibro can be operated only when needed. The NB System has been used for more than 50 projects in Japan. In this paper, we report a construction case of steel pipe piles with a length of 87.5 m and steel pipe sheet piles with a length of 43.5 m both using the NB system in bridge foundation work.


Pile Installation Inner Excavation Vibration Steel Pipe Pile Steel pipe sheet piles Long-Size Pile Shortening Construction Periods Reduction of Roadway Environmental Impact 


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  1. Harada, O., Itabashi, M., Komazawa, T., and Nomaki, M. (2019), Example of steel pile sheet pile installation method for deep steel pile in the ground with hard middle strata. The 74th JSCE Annual academic lecture.Google Scholar
  2. Komazawa, T., Shimada, Y., and Terui, T.(2017), An application of a pile installation method combining inner excavation with vibration for steel pipe piles(NB System). International Conference on advancement pile technology and pile case histories (PILE 2017).Google Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  1. 1.Nihon Base Co. LtdTokyoJapan
  2. 2.Obayashi CorporationTokyoJapan

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