灌注水下混凝土应注意哪些事项？
参考答案：
（1）注意防止水流对混凝土的冲刷影响，在灌注范围内，水不得流动，在灌注过程中以及在混凝土尚未充分硬化以前，不得做任何抽水，排水工作。
（2）导管应试拼冲水检查保证不漏水、不脱节、内壁不锈蚀，并在使用前用充水法进行检查；灌注不得中断。
（3）如采用多组导管同时灌注，应注意各组导管保持均一的灌注速度。
（4）在灌注过程中，应经常不断的提升导管。
（5）为避免灌注工作发生中断，应有备用搅拌机和导管等设备。
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