Various issues have been encountered in the removal work of existing piles, such as existing piles being left in the ground, the subsidence of the surrounding ground, and the deterioration of the ground environment when reusing the site. However, there are no regulations for the filling material to be injected into the draw holes that form after the removal of existing piles or for the removal work itself. In this study, therefore, for an evaluation of the effect of the insertion of the casing by rotation on an existing pile in the removal work of existing piles, the effect of the stress loaded onto an existing pile when the casing is inserted into the ground using MPS-CAE and the mechanism of its occurrence are clarified. As a result, it is found that the inner diameter of the casing used for the diameter of an existing pile, the value of the plastic viscosity of the drilling fluid, and the mechanism of the stress loaded onto an existing pile against the pile diameter can be evaluated such that the destruction of the existing piles can be avoided.
Construction theories and examples for method of powerfully chucking the tip of existing pile at removal of existing piles Shuichi KUWAHARA 1 ,Shin-ichi HAMAGUCHI 1 ,Yoshikatsu SHIMADA 1 ,Shinya INAZUMI 2 1 Japan Association for Pulling-out Existing Piles (JAPEP)
The demolition of social infrastructures including the civil structures have been increasing because of aging them constructed during in a period of high economic growth and decrease in their utilization with a population decrease, in recent years. As a result, removal works of existing pile in the ground have been increasing. Pulling-out method is adopted for removal of existing a pile foundation in the present circumstances. However, after pulling-out a pipe foundation, decline of mechanical characteristic of surrounding ground is concerned by forming pulling-out holes. There are no regulations yet for filler injected into a pulling hole, and the influence of the strength of the filler on surrounding ground is not considered. This study considers the influence by which a pulling-out hole of a pipe foundation gives it to static characteristics of surrounding ground by using 3D elastic-plastic finite element analysis. The special qualities required for fillers injected into a pulling-out hole are also clarified in this study.
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