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输油管线穿河段由于冲刷悬空，打桩加固形成多跨梁式结构。在考虑边界土壤条件及支墩情况下，提出了悬空段加固前后固有频率的计算方法，并和实测值比较验证了该方法的可靠性。
Due to the scouring and floating of the oil pipeline passing through the river section, the piles are reinforced to form a multi-span beam structure. The calculation method of natural frequency before and after suspension section strengthening is proposed considering the boundary soil conditions and the pier support. The reliability of this method is verified by comparison with the measured values.