箱型柱、箱型梁这类构件,四面成形靠人扶、靠锤敲、靠卷尺量。腹板和下翼板对不齐,缝里留几毫米空隙,后面埋弧焊一烧,熔渣顺着缝往外淌,补都补不过来。一根十来米的箱型梁,两三个熟练工磨半天,尺寸还不一定稳。
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