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.
后张法预应力混凝土I形梁预制张拉时，易产生侧向位移，影响梁片的安装、使用和安全。
When the precast I beam is tensioned, the lateral displacement tends to take place and will affect the installation, application and safety of the beam.
大型预制预应力混凝土箱梁架设中不同工况下的梁体应力满足设计要求是箱梁安全架设的关键。
The stress under different working modes is the key to the safe problem when erecting long span prestressed concrete box beam.
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