本文结合工程实例，介绍预应力钢筋张拉时理论伸长值的计算方法。
The paper introduces the calculation methods of extension of prestressed reinforcement combining with project instance.
结合工程实例，论述了重力式码头抛石基床遭拖轮启动工作时尾吹水流冲刷破损后的检测诊断方法和加固治理措施。
Based on the actual example in the project, we discuss the diagnosis methods and reinforcement measures when rubble bed of gravity wharf is damaged by water flow from tugboat's starting.
结合工程实例，介绍直接利用气囊搬运箱涵下水时的稳定计算，并用计算结果指导施工。
This paper presents the stability calculation for box culvert's launching into water with gas cushion combining an engineering project, the result of which can be used to guide construction.
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