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六十年代以后,技术先进国家纷纷采用对预应力束内各预应力筋实行分别锚固的楔片锚固体系,它具有其他体系难以达到的优点:设计、施工方便,吨位可大可小,可直线可曲线,可有粘结可无粘结,也可先张或后张,充分发挥高强度材料(钢丝或钢铰线)的强度和变形能力等等。为了比较和参考,现将该体系中几种千斤顶的技术指标列于表1。它们都是成束伸长张拉预应力的大吨位、大孔径、穿心式千斤顶。虽然分别锚固而造成锚具和预应力束径向尺寸大,千斤顶直径和重量较大,但安装起来比较方便迅
Since the 1960s, technologically advanced countries have adopted wedge-anchored anchoring systems for prestressed tendons in prestressed tendons, which are difficult to achieve with other systems: design and construction are convenient, tonnage can be varied, and can be linear Curve, there may be no adhesive bonding, can also be Zhang Zhang or Zhang Zhang, give full play to the strength of high-strength materials (steel wire or steel hinge) and deformation capabilities and so on. For comparison and reference, the technical indicators of several jacks in this system are listed in Table 1. They are large-tonnage, large-aperture, and piercing-type jacks with pre-stressing in bundles. Although the radial dimension of anchorages and prestressed bundles is caused by anchoring, and the diameter and weight of the jacks are relatively large, they are relatively easy to install.