In our country, the technique of prestressing concrete has been applied in engineering projects for 40 years.
预应力混凝土技术在我国工程建设中的推广应用，已有四十年的历史。
As a branch of the post-tensioned prestressing system, external prestressing technique has become a hotspot of prestressing techniques in recent years.
体外预应力技术作为后张预应力体系的重要分支之一，近年来成为预应力技术的热点。
Using strengthening of the existing Bridges as examples, it introduces application of external prestressing technique on strengthening of existing t frame Bridges.
结合桥梁加固实例，介绍体外预应力技术在T构桥梁加固中的应用。
However the theory research on external prestressing technique applicable to the reinforcement of such Bridges is becoming common now, the reinforcement theory is still immature.
目前对适用于这类桥梁加固的体外预应力技术的理论研究比较普遍，但其加固理论并未成熟。
However the theory research on external prestressing technique applicable to the reinforcement of such Bridges is becoming common now, the reinforcement theory is still immature.
目前对适用于这类桥梁加固的体外预应力技术的理论研究比较普遍，但其加固理论并未成熟。
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