体外预应力法作为后张预应力体系的重要分支之一,因其高效、经济且施工方便等优势,在建筑结构加固和改造工程中发挥着越来越重要的作用。本文主要阐述了体外预应力法加固混凝土梁的原理及其优势与适用范围,并介绍了体外预应力技术的施工工艺和施工要点。 As one of the important branches of post-tensioned prestressed system, external prestressing method plays an increasingly important role in the reinforcement and reconstruction of building structures due to its advantages of high efficiency, economy and convenient construction. This paper mainly expounds the principle, the advantages and the applicable scope of the reinforced concrete beam prestressed by external prestressing method, and introduces the construction technology and construction essentials of external prestressing technology.