Seite - 1291 - in Book of Full Papers - Symposium Hydro Engineering

indispensable measure of temperature control and crack prevention in concrete dam [4, 5]. But, the pipe cooling of mass concrete are used in manual mode before Xiluodu (Dam concrete pouring started in March 2009). This pattern of construction and work is very rough, which cannot take full account of the related factors, such as air temperature, pouring temperature, spacing of water pipes, construction process, data collection and control method etc. In fact, with the rapid development of information and automation control technology, the research and application of intelligent control technology in the civil industry are booming in recent years. There have been many successful cases of applications for some specific areas [6-8]. How to apply information technology and automation control technology to the dam concrete temperature control construction, to solve the drawbacks of the traditional manual pipe-cooling construction mode, and to further improve the quality of concrete in construction and ensure the structural safety? This becomes an urgent problem to be solved in front of water conservancy workers. A real-time, online and personalized intelligent cooling control method and system for a mass concrete structure (ICCS) is developed in this paper. The proposed method is an important engineering measure to prevent the mass concrete structure from cracking during the construction period. The proposed controlling method and system were successfully used to guide the temperature controlling of Xiluodu arch dam construction. The proposed novel method will be beneficial to the design and construction of the similar projects for controlling thermal stress of mass concrete structure. The following is a detailed introduction to this system. 2. THE METHOD AND PRINCIPLES OF INTELLIGENT COOLING CONTROL 2.1. BASIC PRINCIPLES OF INTELLIGENT TEMPERATURE CONTROL Temperature is an important index of crack prevention of concrete dam. To achieve the target, the intelligent control method changes the model of setting flow as the control factor into the model of setting temperature as key factor. It follows the three principles below: (1) control the highest temperature during the procedure of cooling down, as well as the highest value in 3-7 days after the pouring of concrete. (2) coordinate the temperature gradient in the whole procedure of cooling down. (3) forecast or warn for anomalous values when the temperature suddenly goes up or goes down. The principles are explained respectively as below. 1291