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1957年在沿海地质较差的河床上,修建了砂砾垫层基础,前坡改为6:1的重力台桥梁。1958年又试造了埋置式台和新型轻型台的桥梁(附简图),并已先后通车。现将砂砾垫层基础的施工情况及一些初步体会分述如后:(一)土质概况我们所建造的砂垫层基础桥梁,都在沿海地区,为远年海滩泥渡淤积而成,呈青灰色,内有腐植孔,不透水,但经水浸湿后呈淤泥状,干燥后成硬块,破碎后又为粉砂状系粉砂性粘质土壤,承载力根据1957年类似土壤试验结果,其允许承载力为0.6公斤/平方公分。
In 1957 in the coastal poor riverbed, built gravel cushion foundation, the front slope to 6: 1 gravity bridge. In 1958, another trial was made on the bridge between the buried platform and the new light platform (with simplified drawings) and it has been put into operation one after another. Now gravel cushion foundation construction situation and some of the preliminary experience is divided as follows: (a) soil profile The foundation of the sand cushion foundation bridge we are building, are in the coastal areas, silted up for the distant years muddy beaches, was green Gray, humus hole inside, impermeable, but after the water soaked sludge, into a lump after drying crushed and silty silty clay soil, bearing capacity according to similar soil test results in 1957, Its allowable carrying capacity is 0.6 kg / cm².