预应力混凝土管桩是近十余年来应用较多的一种预制桩型。
Prestressed concrete pipe pile which is widely used in the recent decade is a type of precast concrete pile.
主要针对预应力箱梁在预制过程中所须的内模，在结构形式、使用原理等方面进行了研究。
This article mainly aims at the internal mold used in the process of prefabricating box-girder and conducts researches on it's structural style, activity principle and so on.
分析预制混凝土梁（板）在施加预应力时质量缺陷的原因及其对策。
The paper analyzes reasons for quality defects as the precast girder is prestressed and raises strategies for them.
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