In order to solve the newly vertical prestress in the consolidation the bridge structure, the paper points out to adopt the new prestressed system combining the lengthening precision rolled reinforced steel prestressed system and the locking bar, proves by the tension tests that the loading capacity of the reaming locking anchor head can meet the demands of the precision rolled reinforced prestressed tensile and anchorage, and it can be applied in the consolidated projects of the large concrete and rock slopes.%为了解决桥梁结构加固中重新施加竖向预应力的问题，提出了采用加长精轧螺纹钢预应力体系与自锁锚杆相结合的一种新型预应力体系。张拉试验结果表明，扩孔自锁锚头的承载力能够满足正常的精轧螺纹钢筋预应力张拉及锚固的要求，也可以推广应用于大体积混凝土和岩石边坡的加固工程中。
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