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三峡水利枢纽永久船闸竖井多为大断面、多井群组合结构,且为双层钢筋,又有大量高精度要求的金结埋件,尤其是下部闸室段结构复杂,钢筋密集,因此工作量大,施工干扰大,施工难度大。洞井施工相互制约,又受金结安装交面工期的制约,故工期较为紧张。普通的混凝土垂直运输方式浇筑强度低,受干扰大。从溜管(槽)在南六竖井的应用情况看,在垂直运输高度为30m的情况下,很容易发生骨料分离现象,对混凝土质量有较大的影响。日本前田建设工业株式会社研制的M·YBOX系统,在垂直状态时可利用混凝土原骨料自重通过M·YBOX系统,达到防止骨料分离的目的。M·YBOX系统在中国应用尚属首次,针对永久船闸输水系统的工程特点,将该新产品在三峡工程中的应用作为一个课题进行研究并取得了成功的经验,较好地解决了竖井混凝土垂直输送的问题。
The permanent ship lock shaft of the Three Gorges Project is mostly a composite structure with a large section and multiple well groups, and is a double-layer steel bar. There are also a large number of gold-embedded parts required for high-precision requirements. In particular, the structure of the lower chamber section is complex and the reinforcing steel bar is intensive. Large, construction interference, construction difficult. Cave construction mutual restraint, but also by the installation of gold junction construction constraints, so the construction period is more tense. Ordinary concrete vertical transport mode pouring strength is low, subject to interference. From the slip tube (slot) in the application of the situation in the South six shafts, the vertical transport height of 30m case, it is prone to the phenomenon of aggregate separation, the concrete quality has a greater impact. The M · YBOX system developed by Maeda Construction Industry Co., Ltd. of Japan can utilize the weight of concrete aggregate to pass through M · YBOX system in the vertical state to prevent the aggregate from being separated. The application of M · YBOX system is the first time in China. According to the engineering features of the permanent ship lock water delivery system, the application of the new product in the Three Gorges Project is studied as a subject and gained successful experience. Vertical transport problem.