某电站下水库面板及趾板混凝土裂缝处理

大坝与安全 ›› 2023 ›› Issue (2): 53-.

某电站下水库面板及趾板混凝土裂缝处理

高浩，王志宏，刘德明

杭州国电大坝安全工程有限公司，浙江杭州，311122

收稿日期:2022-03-23 修回日期:2022-04-14 出版日期:2023-04-08 发布日期:2023-05-30
作者简介:高浩（1992— ），男，湖北黄冈人，工程师，主要从事各类工程建筑物的缺陷处理技术和材料研究工作。

Treatment of concrete cracks in the face slab and toe slab of the lower reservoir of a power station#br#

GAO Hao, WANG Zhihong and LIU Deming

Hangzhou Guodian Dam Safety Engineering Co., Ltd.

Received:2022-03-23 Revised:2022-04-14 Online:2023-04-08 Published:2023-05-30

摘要/Abstract

摘要： 某抽水蓄能电站下水库面板及趾板混凝土施工期出现了较多裂缝，裂缝以深层缝、渗水缝为主，裂缝长度1.1~13.2 m，裂缝宽度0.03~1.12 mm，其中面板裂缝基本为规则横向，趾板裂缝垂直于趾板延伸方向，有极少数斜向裂缝、X型裂缝、Y型裂缝，初步分析裂缝的产生主要与混凝土干燥收缩、温度变形、基础约束等因素有关。针对Ⅰ～Ⅳ类不同类型的裂缝，分别采用了表面封闭、封缝无损贴嘴+表面封闭、切线槽化学灌浆+表面封闭、凿槽封缝后化学灌浆+表面封闭等不同方法进行处理。蓄水前压水试验检查结果表明，裂缝处理效果良好，缝内填充密实，裂缝隐患得到有效消除。蓄水运行后未见明显渗漏，下水库运行状况稳定。

关键词: 抽水蓄能电站, 面板混凝土, 趾板混凝土, 裂缝, 化学灌浆

Abstract: There are many cracks in the face slab and toe slab of the lower reservoir of a pumped-storage power station during the construction period. The cracks are mainly deep cracks and seepage cracks, with 1.1~13.2 m in length and 0.03~1.12 mm in width. The cracks on the face slab are basically regular transverse, and the cracks on toe slab are perpendicular to the extension direction of toe slab, with a few inclined cracks, X-shape cracks and Y-shape cracks. The preliminary analysis shows that the cracks are mainly caused by the factors such as drying shrinkage of concrete, thermal deformation, foundation constraint and et al. For cracks from class Ⅰ to Ⅳ, different treatment methods are adopted such as surface sealing, close grouting and surface sealing, slotting across cracks and surface sealing, chemical grouting and surface sealing after chute-cutting and crack patching. The results of water pressure test before impoundment show that satisfying effect is obtained from crack treatment, cracks are filled densely and defects are effectively eliminated. There is no obvious leakage after impoundment and the operation condition of the lower reservoir is stable.

Key words: pumped-storage power station, face slab concrete, toe slab concrete, crack, chemical grouting

中图分类号:

TV698.2

高浩, 王志宏, 刘德明. 某电站下水库面板及趾板混凝土裂缝处理[J]. 大坝与安全, 2023, 0(2): 53-.

GAO Hao, WANG Zhihong and LIU Deming. Treatment of concrete cracks in the face slab and toe slab of the lower reservoir of a power station#br#[J]. Dam & Safety, 2023, 0(2): 53-.

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