塔带机浇筑大坝混凝土工艺

Dam Concrete Placement by Towerbelt

塔带机浇筑混凝土的突出特点是供料连续 ,强度高 ,并具有仓面布料功能 ,但也存在预冷混凝土在输送中温度回升较大 ,如控制不当较易出现混凝土骨料分离现象等问题。如何确保塔带机浇筑混凝土既高速度 ,又高质量 ,是工程施工中必须解决的关键问题。文章结合三峡二期厂坝工程混凝土施工情况 ,探讨了塔带机浇筑大坝混凝土时的混凝土原材料质量控制、仓面配套设备、仓面施工工艺。

The outstanding properties of concrete placement by towerbelt are the interrupted feeding, high intensity and the capability of direct pouring on the block. However, there would be some problems of back rise of temperature of the pre-cooled concrete during transportation, which is prone to segregation of concrete aggregate if not suitably controlled. Therefore, how to guarantee the concrete placement by towerbelt both at high speed and of good quality is the key issue to be solved during the construction. Some key issues are discussed in the paper at combination with the phase II concrete construction of the TGP powerhouse and dam in terms of quality control of raw materials of concrete, counterpart equipment and construction technologies on the pouring block, designs matching and equipment management during the dam concrete placement by towerbelts.