Investigation of exsisting piles used in reconstructing large logistics warehouse

What is it about?

In reconstructing the large logistics warehouse with using existing piles, the piles were investigated. The pile diameter and reinforcement arrangement were as designed, and almost all the piles had no crack. The soundness evaluation by the author’s method was equivalent to that of conventional method. The compressive strength was larger than the designed value, and the neutralization depth was smaller than the designed cover thickness. The embedment in the bearing layer was confirmed by the comparison between the core boring through the pile and the standard penetration test. The magnetic exploration was effective on the evaluation of pile length.

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Why is it important?

The integrity of the piles was confirmed to be in accordance with the design in terms of pile diameter and reinforcement arrangement, and there were no problems with cracks in the piles, thus ensuring the required performance. The results of the evaluation using the method proposed by the authors were equivalent to those of the conventional method. Regarding the durability of the piles, it was confirmed that the compressive strength was sufficiently higher than the design value and the depth of neutralization was sufficiently lower than the design cover thickness, indicating that the quality of the piles was good. The depth of the support layer was confirmed by comparing the depth of the pile tip, which was confirmed by core boring through the pile body, and the depth of the pile support layer, which was confirmed by standard penetration tests. The depth of the pile tip estimated by the magnetic survey was consistent with the depth confirmed by the penetration of the pile body, confirming the validity of the method. We hope that this report will help to promote the use of existing piles.