The large diameter super-long bored pile's bearing capacity is generally very high. The self-balanced method is a new type of static load test method, and it is suitable for the test. At Yueqing Bay No. 1 Bridge, a pile with diameter of 2500 mm and length of 112.0 m was discussed in detail. The post grouting technology at pile bottom was used. The self-balanced method was carried out before and after post grouting. The double layer load cell test method was introduced. The ultimate bearing

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... ity of the upper, the middle, and the lower part piles were obtained. The test results were converted to the traditional top-down method. The ultimate bearing capacity before grouting was 46932 kN, and it was 70680 kN after grouting. The increment percentage was 50.6%.