Making the construction procedures of steel pipe piles more rational and rapid, anew type mechanical joint for steel pipe piles and steel pipe sheet piles were proposed. In order to investigate the corrosion resistant performance of the mechanical joint, three types of exposure tests were carried out, namely, (1) Exposure test on steel materials used for the joint and piles, (2) Bimetal corrosion test on the joint material and the pile material, and (3) Exposure test on the joining surface of the joint under the marine environment. As the result of these tests, it was confirmed that the corrosion resistance performance of the joint material is the same as that of the pile material under the soil surrounding conditions. However, under the marine conditions, the corrosion resistance performance of the joint material is lower than that of the pile material. Moreover, it was confirmed that the joining surface of the mechanical joint has great corrosion resistance performance even if it is in the marine conditions.
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