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由河南汤阴县水泥电杆厂研制的等径400毫米高强钢丝环形预应力混凝土电杆新产品,于1990年9月14日通过省级技术鉴定。等径φ400×6×53.9×y和φ400×6×58.8×y电杆新产品,主要改进了配筋结构和
The new 400 mm high-strength steel ring prestressed concrete pole product developed by Henan Tangyin Cement Pole Factory passed provincial technical appraisal on September 14, 1990. The new products of equal diameter φ400×6×53.9×y and φ400×6×58.8×y poles mainly improve the structure of reinforcements and