Abstract:

The concrete plugging of bottom diversion outlet has high proportion of cement, posing big challenge to the temperature control, therefore pipe cooling is needed. In this research, we recommend to combine the heat pipe cooling calculation formula with the measured temperature of concrete block, which means to dynamically update T_i in the heat pipe cooling calculation formula according to the measured temperature, and then predict the dynamic temperature of concrete block of n days in the future to guide and control the pipe cooling. The dynamic prediction for concrete temperature is proved to be feasible by the practical example of concrete temperature of plugging of bottom diversion outlet at Xiangjiaba Hydropower Project.

Key words: bottom diversion outlet, plugging concrete, initial pipe cooling, dynamic prediction, Xiangjiaba hydropower station