预应力筋是预应力钢筋混凝土工艺中的重要部件,过去,该工艺中使用的预应力筋有粘结型预应力筋和无粘结型预应力筋。其中粘结型预应力筋在其表面的混凝土凝固或半凝固后均无法再对预应力筋进行张拉、施加应力,因此只能用于预应力先张法施工工艺中,在预应力后张法的施工工艺中仍然需要预埋波纹管,并在波纹管外混凝土凝固至一定程度、对波纹管内的预应力筋施加预应力后才可向波纹管内灌注混凝土砂浆,因而施工周期长而复杂。另一种无粘结预应 Prestressed tendon is an important component in the prestressed reinforced concrete process. In the past, the prestressed tendons used in this process were bonded prestressed tendons and unbonded prestressed tendons. Among them, the cohesive prestressing tendons can no longer tension or apply stress to the prestressed tendons after the solidification or semi-solidification of the concrete on the surface. Therefore, the prestressed tendons can only be used in the prestressed pretensioning method in the prestressed post-tensioning process. In the construction process of the method, it is still necessary to embed the corrugated pipe, and the concrete outside the corrugated pipe is solidified to a certain extent and the prestressing ribs in the corrugated pipe are prestressed before the concrete mortar can be poured into the corrugated pipe. Therefore, the construction period is long and complicated. Another non-bonded pre-should