三峡工程泄洪坝段表孔溢流面拉模施工技术

Slip form construction technique for spillway surface with crest outlet of flood discharge section of Three-Gorges Dam

三峡工程泄洪坝段表孔溢流面主要采用一期预留台阶、二期拉模一次成形的方法施工,体型复杂,拉模施工难度大,施工质量要求高,在生产性试验以及对试验结果进行分析的基础上,对混凝土性能、拉模设计、施工措施等方面进行了改进,形成了一套成熟的拉模施工技术。施工结果表明,施工质量达到了设计要求。

The method of pre-setting steps in the first stage and one-time shaping with slip form in the second stage was adopted in construction of spillway surface with crest outlet. With high requirement of construction quality, the project is complicated in shape-type, and difficult in slip form construction. Based on an analysis of experimental results, some improvements were made in concrete performance, slip form design, and construction measures, and a set of mature sllp form construction technique was formed. Practices show that the technique meets the design requirement of construction quality.