三峡工程泄洪坝温控措施实施效果

按施工单位申报经监理批准，１９９９年浇筑计划为２２０万ｍ＾３，至１９９９年１２月３１日年完成２２６．４万ｍ＾３，其中泄洪坝段完成１７４．９３万ｍ＾３。大坝混凝土浇筑的主要区域为基础的束区。由于浇筑手段形成较晚等原因，约束区的混凝土大部在气温较高的５－９月施工，使温控难度增加，但在参建各方的努力下采取了一系列温控措施，取得了较好效果。

Temperature Control over Concrete of Spillway Section

Applied by the contractor and approved by the Engineer, the planned concrete placement in 1999 was 2.2M m 3 ( 0.4534M m 3 poured into the No. 11 - 14 monoliths of the left powerhouse and 1.7463M m 3 into the spillway section ). By Dec. 31, 1999, the placed concrete volume was 2.264M m 3, of which 1.749 3M m 3 of concrete was placed in the spillway section (including the guide wall section ), mainly in the foundation restrained area. Due to the lack of placement means at the initial stage, most of the concrete was placed in the restrained area and in the high temperature season from May through September, which made the temperature control more difficult. But through efforts by parties concerned and because a series of measures were taken good results have been attained in the temperature control of concrete.