大规模尾水首部渐变段顶拱混凝土分层施工技术  

Layered Construction Technology of Concrete for the Top Arch of Large Scale Tailwater Head Transition Section

作　　者：彭正良 张长宁 PENG Zhengiang;ZHANG Changning(POWERCHINA SINOHYDRO ENGINEERING BUREAU 14 CO.,LTD.,Kunming 650041,China)

机构地区：[1]中国水利水电第十四工程局有限公司,云南昆明650041

出　　处：《云南水力发电》2024年第5期94-98,106,共6页Yunnan Water Power

摘　　要：白鹤滩水电站尾水隧洞首部渐变段顶拱浇筑最大跨度达20+m、最大厚度达5 m,如此大跨度、巨厚状顶拱渐变结构,采用常规A48钢管满堂架支模体系已无法满足施工要求,据此,在白鹤滩水电站尾水首部渐变段施工中,创新性地提出了一种承载能力大、对渐变复杂体型适应性强的“钢管排架柱+满堂支撑架”组合新型支撑体系以及合理的浇筑分层方法。不仅有效缩短了本施工部位的施工工期,同时预留的下部通道还有效保证了上游调压室施工的连续性,在成本、质量、安全管理方面也有了质的提升;该施工技术基本能适应一切大跨度、巨厚度体型渐变结构。The maximum span and thickness of the top arch of the transition section at the head of the tailwater tunnel of Baihetan Hydropower Station can reach over 20 meters.The conventional A48 steel pipe full frame formwork system is no longer able to meet the construction requirements for such a large-span and thick top arch gradient structure.Therefore,in the construction of the transition section of the tail water head of Baihetan Hydropower Station,an innovative new type of support system combining"steel pipe bent column+full hall support frame"with high bearing capacity and strong adaptability to complex transition shapes was proposed,as well as a reasonable pouring layer method.It not only effectively shortens the construction period of this construction site,but also reserves a lower channel to ensure the continuity of upstream surge chamber construction,and has made a qualitative improvement in cost,quality,and safety management.This construction technology can basically adapt to all large-span,thick and gradually changing structures.

关 键 词：白鹤滩水电站 渐变段 顶拱混凝土 分层施工技术 

分 类 号：TV544.91[水利工程—水利水电工程]