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本文研究运输荷载为１４０吨的五万千伏安变压器通过莆田江口石拱桥的问题。这个特大荷载在现行桥梁设计规范中是绝对不允许通过江口桥。本文采用结构极限分析了石拱桥在特大荷载下的极限承载能力，并在计算中提出利用外加荷载，调整压力线与拱轴线的偏离，明显地改善和提高石拱桥的承载能力。 本文对于挖掘现有圬工拱桥的潜力，以适应现代化建设的需要具有重大现实意义。
This paper studies the problem of passing a 50-kVA transformer with a transport load of 140 tons through a stone arch bridge at Jiangkou, Putian. This extra large load in the current bridge design specifications is absolutely not allowed through the estuary bridge. In this paper, the ultimate bearing capacity of stone arch bridge under extra-large load is analyzed by the structural limit. In the calculation, it is proposed to use the applied load to adjust the deviation of the pressure line from the arch axis, which obviously improves and enhances the bearing capacity of the stone arch bridge. This article has great practical significance for excavating the potential of the existing arch bridge and meeting the need of modernization.