南水北调穿黄隧洞工程预应力混凝土施工技术

摘要

Based on a brief introduction of the section structure of the Yellow River-crossing tunnel in the South-to-North Water Diversion Project and the layout of anchor ropes, the construction technology of circular bonded pre-stressed concrete using the post-tension method adopted in the tunnel lining construction is described in detail. The construction processes and technologies of concrete pouring, anchor rope tensioning, anchorage slot backfill, and duct grouting are also analyzed. Practice shows that, in the Yellow River-crossing tunnel project, the construction technology of circular bonded pre-stressed concrete using the post-tension method has been successfully applied to the lining construction of a pressure water conveyance tunnel with a large diameter and high head. All the indexes of the project met the design requirements, and good effects were achieved.%在简要介绍南水北调穿黄隧洞断面结构及锚索布置的基础上，详细介绍了该隧洞衬砌施工中采用的有黏结后张法环形预应力混凝土施工工艺，具体分析了混凝土浇筑、锚索张拉、锚具槽回填、孔道灌浆等工序的施工流程、方案及施工技术。施工实践表明，南水北调穿黄隧洞工程是有黏结后张法环形预应力混凝土施工技术在我国大洞径、高水头有压输水隧洞衬砌结构工程中的又一次成功应用，完全满足对预应力控制的条件，各项指标均达到设计要求，取得了较好的效果。