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南水北调中线干线工程汤阴段是总干渠Ⅳ渠段(黄河北~羑河北)的组成部分,位于Ⅳ渠段中黄羑段的最北部,地域上属于河南省安阳市的汤阴县。起点总干渠设计桩号为Ⅳ175+432.80,终点设计桩号为Ⅳ196+749。汤阴段全长21.32 km,明渠段长20 km,渠道渠底纵比降采用1/23000、1/28000两种,内边坡1:2.0~1:3.25。文章以南水北调中线工程汤阴段渠道混凝土衬砌工程为例,分析薄壁混凝土在冬季低温条件下施工过程中应注意的要点,根据当地环境和具体实际,重点研究了混凝土浇筑后蓄热法保温措施。
The project of the Middle Route of South-to-North Water Diversion Project Tangyin segment is an integral part of the IV channel of the main canal (North Yellow River to North Hebei River) and is located in the northernmost part of the Huangpi segment in the Ⅳ channel. It belongs to Tangyin County in Anyang City, Henan Province. Starting point of the main canal design Stake No. IV175 +43 2.80, the end of the design Stake No. IV196 +749. The total length of Tangyin section is 21.32 km and the length of open channel section is 20 km. The vertical ratio of channel bottom drains adopts 1/23000 and 1/28000, and the inner slope ranges from 1: 2.0 to 1: 3.25. Taking the concrete lining project of Tangyin section in the midline of South-to-North Water Diversion Project as an example, the key points that should be paid attention to during the construction of thin-walled concrete at low temperatures in winter are analyzed. According to the local environment and practical practice, the thermal insulation measures .