Temperature Control of RCC Dam in Yongding Project

2012 ◽  
Vol 238 ◽  
pp. 272-277
Author(s):  
Xiang Dong Xu ◽  
Jin Chao Yue
Keyword(s):  
Temperature Control ◽  
Cooling Water ◽  
Practical Method ◽  
Gravity Dam ◽  
Counter Measures ◽  
Water Pipes ◽  
Rcc Dam ◽  
Key Points ◽  
Concrete Temperature ◽  
Key Factor

Yongding RCC gravity dam with large project scale is in the construction all over the year, and the big temperature stress is a key factor for construction quality and progress. The temperature of the RCC dam in typical season with and without control conditions was analyzed by FEM, the temperature situation in typical season of RCC dam was controlled by the embedded cooling water pipes by practical method. Key points in concrete temperature control during high temperature season are found out, the counter measures and issues to be noticed are put forward.

Temperature Control Measures and Feedback Analysis in Rapid Construction of Guandi RCC Dam

2012 ◽  
Vol 594-597 ◽  
pp. 1979-1982
Author(s):  
Wei Zhou ◽  
Xiang Yang Jing ◽  
Xing Hong Liu
Keyword(s):  
Temperature Control ◽  
Control Method ◽  
Dynamic Control ◽  
Cooling Water ◽  
Control Measures ◽  
Obvious Effect ◽  
Feedback Analysis ◽  
Cooling Water Temperature ◽  
Rcc Dam ◽  
Rapid Construction

Due to the shortcomings of conventional methods, the temperature control in rapid construction of Guandi dam is less effective. Then improved measures are designed and implemented based on the dynamic control method of pipe cooling, which depends on the real-time adjustment of five factors affecting pipe cooling (beginning time of cooling, lasting time of cooling, water temperature, rate of flow and direction of flow). The monitoring and feedback calculation are conducted. It is found that the newly-designed measures have obvious effect, and that there are no harmful cracks in the whole construction of Guandi dam. The conclusion is that it can effectively solve the problem of temperature control and crack prevention of high RCC dam via these measures, and provide some guide and reference to other similar projects.

Experimental Study on RCC Character of Additive MgO and Simulation of Crack Prevention in High Temperature Construction

2011 ◽  
Vol 368-373 ◽  
pp. 651-654 ◽  
Author(s):  
Lei Guo ◽  
Hai Yong Cai
Keyword(s):  
High Temperature ◽  
Magnesium Oxide ◽  
Cooling Water ◽  
Scientific Basis ◽  
Dam Construction ◽  
Water Pipes ◽  
Roller Compacted Concrete ◽  
Rcc Dam ◽  
Construction Scheme ◽  
Temperature Environment

Characteristics of RCC concrete with greater proportion of magnesium oxide style in domestic are few mentioned, urgently awaits to further study. Through the test of additive magnesium oxide roller compacted concrete's characteristics, to determine the appropriate magnesium oxide style admixture of roller compacted concrete; Accurately calculation the temperature field and stress field of the simulation, the results show the mixed magnesium oxide technology and bury HDPE cooling water pipes measures combining to RCC construction of high-temperature cracking is an effective method of temperature control and crack prevention. It is for the high-temperature environment of RCC dam construction scheme has provided important scientific basis.

scholarly journals Temperature Control Technology for Construction of Jinsha River Bridge

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Hui-Wu Jin ◽  
Guo-An Wang ◽  
Zhan-Ming Chen
Keyword(s):  
Temperature Control ◽  
Temperature Difference ◽  
Cooling Water ◽  
Good Health ◽  
Large Mass ◽  
Maximum Temperature ◽  
Mass Concrete ◽  
Jinsha River ◽  
Mixture Ratio ◽  
Concrete Temperature

The key problem of mass concrete temperature control is to effectively control the maximum temperature inside concrete, the temperature difference between inside and outside concrete, and the temperature difference between surface and environment. The size of the main tower cap of No. 3 Jinsha River Bridge is 37 m × 23.5 m × 5.5 m, and the cubic volume of concrete reaches 4782.3 m3, which is poured in two times. In order to ensure construction quality of mass concrete structure, prevent the large mass concrete temperature stress, through the numerical simulation of the temperature control and optimization scheme, by optimizing the mixture ratio design, reducing the temperature of concrete pouring into the mold, cooling water cycling, insulation keeping in good health and a series of measures to effectively achieve the control goal, and eliminating the temperature cracks. The measured data show that the maximum temperature inside concrete, the temperature difference between inside and outside, and the temperature difference between surface and environment are qualified, but the temperature difference control of cooling water inlet and outlet has hysteresis effect, and the temperature difference between inlet and outlet will be greater than 10°C, which should be noticed.

The Temperature Control Simulation on Concrete Dam Simulation Analysis of the Concrete Block in First-Stage Water Cooling

2012 ◽  
Vol 462 ◽  
pp. 402-406
Author(s):  
Ying Bin Kang ◽  
Hui Xia Bian
Keyword(s):  
Temperature Field ◽  
Temperature Control ◽  
Simulation Analysis ◽  
Control Measure ◽  
Cooling Water ◽  
Concrete Block ◽  
Water Cooling ◽  
Concrete Dam ◽  
Cooling Pipe ◽  
Concrete Temperature

Control the concrete temperature to reduce the temperature cracks is one of the main tasks in the concrete dam construction. Water cooling is the most effective temperature control measure of concrete dam. In connection with the concrete temperature field of cooled computational problems, according to the water and heat exchange between the concrete and cooling water pipes, The cooling pipe is considered as the effect source of heat, and the effect of the water cooling is considered on average meaning, and then the approximate temperature field can be obtained through the finite element.

scholarly journals Research on concrete temperature control measures in deep hole area of super high arch dam

2021 ◽  
Vol 826 (1) ◽  
pp. 012035
Author(s):  
Yuchen Fu ◽  
Yaosheng Tan ◽  
Chunfeng Liu ◽  
Lei Pei ◽  
Yajun Wang ◽  
...  
Keyword(s):  
Temperature Control ◽  
Arch Dam ◽  
Control Measures ◽  
Deep Hole ◽  
High Arch Dam ◽  
Hole Area ◽  
Concrete Temperature

A new method for hydraulic mass concrete temperature control: Design and experiment

2021 ◽  
Vol 302 ◽  
pp. 124167
Author(s):  
Xiaochun Lu ◽  
Bofu Chen ◽  
Bin Tian ◽  
Yangbo Li ◽  
Congcong Lv ◽  
...  
Keyword(s):  
Temperature Control ◽  
Control Design ◽  
New Method ◽  
Mass Concrete ◽  
Concrete Temperature

Application of MGM(1,N) on Concrete Temperature Prediction of RCC Dam

2011 ◽  
Vol 368-373 ◽  
pp. 2406-2410
Author(s):  
Yu Qing Zhao ◽  
Yu Ping Tong
Keyword(s):  
Goodness Of Fit ◽  
Scientific Evidence ◽  
Influencing Factor ◽  
Mathematics Model ◽  
Rcc Dam ◽  
Rock Temperature ◽  
Concrete Temperature ◽  
Dam Concrete ◽  
Development Tendency ◽  
Temperature Crack

The basic modeling principal and method of grey mathematics model is introduced , taking the case of JiangYa RCC gravity dam, on the basis of the interior of dam concrete temperature monitoring data , According to Multi-Variables grey principal, model is founded , change character of concrete temperature is analyzed, and the development tendency of interior concrete temperature is predicted on the basis of the influencing factor-water temperature, air temperature and rock temperature by Multi-Variables grey principal. It is proved that the model founds successfully and it’s goodness-of-fit is very well. calculation base for the temperature stress of dam concrete is provided by founding ,scientific evidence is offered to prevent the temperature crack and ensure the dam safe operation ,the model has some engineering valuable significance.

scholarly journals Design and Build Temperature Control and Monitoring in Diesel Engines Using Mobile

2020 ◽  
Vol 10 (1) ◽  
pp. 31-37
Author(s):  
Mohammad Hasan Fuadi
Keyword(s):  
Diesel Engine ◽  
Temperature Control ◽  
Diesel Engines ◽  
Temperature Sensor ◽  
Cooling System ◽  
Cooling Water ◽  
Solenoid Valve ◽  
Valve Opening ◽  
Opening And Closing ◽  
And Control

Diesel engines is generally used for industrial and agricultural machines. Few people care about the engine temperature so it is forced to reach temperature of 100oC, which causes overheating of the diesel engine and has an impact on the performance itself. This also uses a hopper cooling system which is certainly not effective, because it's necessary to see that the water in the reservoir is still or not, also not equipped with an engine temperature display so it's difficult to ascertain the temperature inside. This study aims to monitor and control the temperature of cooling water. Operation of temperature control uses a telecontrol system that is connected to network (Internet of Things) so diesel temperature control can be done remotely. Monitoring of temperature and water level in the reserve tank using Web Mobile. In addition, there is a temperature sensor that is used to measure the temperature of the cooling water so that users can monitor the temperature of the diesel engine on Web Mobile. The test results obtained, the temperature sensor has an average temperature reading error of 0.031004%. Diesel engines with controlled solenoid valve cooling systems can produce ideal temperatures compared to when the solenoid valve is open (using the radiator continuously) or when the solenoid valve is Closed (without using a radiator). When the solenoid is controlled the engine temperature can be ideal because the solenoid valve opening and closing system has the lowest temperature of 56.34oC and the highest temperature of only 80.85oC.

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