- 目录
- 混凝土与制品
- 首页
港珠澳大桥环岛挡浪墙素清水混凝土裂缝控制技
作者：陈克伟1，2，孙振平1，王成启2，谷坤鹏2
（1.同济大学 材料科学与工程学院，上海 201804；2.中交上海三航科学研究有限公司，上海 200032）
摘要：港珠澳大桥东人工岛护岸挡浪墙属于大体积素清水混凝土长墙结构，内部无钢筋。在分段长度为9 m前提下，通过足尺寸模型研究挡浪墙裂缝发展规律，并寻求有效的裂缝控制技术。试验结果表明：不采取内部降温措施情况下，挡浪墙体的内部温升为45.9 ℃，应变为126×10-6，墙体出现3条裂缝；墙体内布设1层和2层冷却水管情况下，内部最高温度分别降低9.2 ℃和14.1 ℃；墙体内布设2层冷却水管，控制侧墙与底板浇筑间隔时间不超过10 d，墙体无裂缝产生。
关键词：港珠澳大桥；挡浪墙；清水混凝土；足尺寸模型；冷却水管
中图分类号：TU528.36 文献标识码：A 文章编号：1001-702X（2019）04-0001-04
Study on crack control technology for fair-faced concrete of the protection wall in
the east artificial island of HongKong-Zhuhai-Macao Bridge
CHEN Kewei1，2，SUN Zhenping1，WANG Chengqi2，GU Kunpeng2
（1.School of Materials Science and Engineering of Tongji University，Shanghai 201804，China；
2.CCCC Shanghai Third Harbour Engineering Academy of Science Co. Ltd.，Shanghai 200032，China）
Abstract：The protection wall in the east artificial island of Hongkong-Zhuhai-Macao Bridge is a mass concrete structure，also long wall structure. Supposing the length of the wall is 9 meters，the paper researches the development law of cracks in the retaining wall through full-scale model test，and researches effective crack control technology. The research results show that：without internal cooling control measures，the internal temperature rise of the wall is 45.9 ℃ and the strain is 126×10-6. At the same time，there will be three cracks in the wall. The highest temperature inside the wall is reduced by 9.2 ℃ by placed one layer of cooling water pipe，and reduced by 14.1 ℃ by placed two layers of cooling water pipe. When two-layer cooling water pipes are arranged in the wall and the construction time interval between the bottom plate and the wall is not more than 10 days，there is no crack in the wall.
Key words：Hongkong-Zhuhai-Macao Bridge，protection wall，fair-faced concrete， full-scale model，cooling water pipe