索网在建设时必须施加预应力。
Pre-stress must be inflicted during the cable net construction.
并结合大源渡工程实践介绍了对人字门背拉杆施加预应力的方法。
Combined with the engineering practice of the Dayuandu project, the process of applying prestress on the back tie rods of the miter gate is also described hereinafter.
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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