施工性を考慮してSC杭の中空部を残した改良方法の検討

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書誌事項

タイトル別名
  • A STUDY ON IMPROVEMENT METHOD LEAVING HOLLOW PART WITH STEEL & COMPOSITE PILES IN CONSIDERING WORKABILITY
  • 施工性を考慮してSC杭の中空部を残した改良方法の検討 : SC杭の変形性能向上に関する研究(3)
  • セコウセイ オ コウリョ シテ SC クイ ノ チュウクウブ オ ノコシタ カイリョウ ホウホウ ノ ケントウ : SC クイ ノ ヘンケイ セイノウ コウジョウ ニ カンスル ケンキュウ(3)
  • SC杭の変形性能向上に関する研究(3)
  • Study on improvement in deformation capacity of steel & concrete composite pile

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抄録

 The objective of this study is to examine the improvement method with hollow part of SC pile in order to improve the deformation performance of SC pile. In the pile foundation structure, the improvement of design is prompted assuming large earthquake. However, study on the deformation performance of precast concrete pile is not sufficiently advanced. Therefore, the test data accumulation is not enough to discuss the deformation performance of pile.<br> In the previous study, we confirmed that filling the hollow part of the SC pile with reinforcement was effective for improving the deformation performance. However, there were some issues on the terms of construction when it use the SC piles filled with reinforcement for the hollow parts. Therefore, we studied an improvement method that left the hollow part for preparing flexibility in terms of construction. We examined two improvement methods. Two improvement methods were 1) to increase the thickness of the pile body concrete, 2) to install an inside steel pipe in the hollow part of SC pile. We confirmed the effectiveness of the improvement method by simple beam bending test and cantilever beam bending shear test.<br> We analyzed the relations between the displacement of vertical and the angle of member, relations between the load and the displacement, and relations between the bending moment and the curvature. Furthermore, we proposed an analytical method to evaluate the deformation performance of piles and compared the analytical values with the experimental values.<br> The knowledge obtained from this study are shown below.<br><br> 1) By increasing the thickness of the pile body concrete, it is difficult to suppress the large decrease in bending strength and axial displacement after confirming the maximum proof stress. However, the effect of improving deformation performance can be expected.<br><br> 2) The effect of improving the deformation performance by increasing the thickness of the pile body concrete is inferior to reinforcement using concrete for filling material. However, it is same to reinforcement using soil cement for filling material.<br><br> 3) By making the pile a double steel pipe, axial displacement due to repeated bending stress can be suppressed, and improvement effect on bending deformation performance can be expected.<br><br> 4) The effect of improving the deformation performance by making the pile a double steel pipe is same to reinforcement using soil cement for filling material.<br><br> 5) We proposed an analytical method considering the influence of the outer outside steel pipe and the pile hollow part. The relationship between the bending moment of the pile and the curvature can be evaluated by the proposed analysis method. However, the result of the proposed analysis method is underestimated when the hollow part is improved with multiple materials (inside steel pipe and mortar).

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