南防线茅岭江大桥是一座铁路、公路平行并列而结构分离的桥梁。铁、公两桥的中线相距9.60m。桥梁主跨采用48+80+48m的预应力钢筋混凝土连续箱梁,水中主墩为高承台中等直径的多柱式钻孔桩基础。每墩用直径1.35m的钢套(护)筒柱桩7根,下部以直径1.25 South line of defense Maoliang River Bridge is a railway, parallel to the highway and structural separation of the bridge. Iron, the bridge between the two public bridge distance 9.60m. The main span of the bridge is 48 + 80 + 48m prestressed reinforced concrete continuous box girder. The main pier in the water is a medium-diameter multi-column bored pile foundation with high cap. Each pier with a diameter of 1.35m steel sheath (retaining) column 7, the lower part of a diameter of 1.25