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无粘结部分预应力砼结构早为许多国家采用。70年代初,我国在房屋建筑中开始研究。随着无粘结筋的生产和施工工艺的成熟,80年代开始推广应用。无粘结预应力筋,是由单根或多根高强钢丝、钢绞线或钢筋沿全长涂抹防腐蚀油脂并用聚乙稀热塑套管包裹而成。
Unbonded part of the prestressed concrete structure as early as many countries. In the early 1970s, our country began to study in housing construction. With the production of unbonded tendons and construction of mature technology, 80 years began to promote the application. Unbonded prestressing tendons are made of single or multiple high-strength steel wires, steel strands or steel bars coated with anti-corrosion grease along the entire length and wrapped with a polyethylene thermoplastic sleeve.