| The anchorage mass concrete is an important structural part of the suspension bridge,and its overall durability and safety are directly related to the reliability of the entire bridge.In this paper,the construction of the Wushan Guihua Bridge(Baiquan side)gravity anchor block structure is the research object,and the following research is carried out on the anchor block mass concrete.(1)Calculate the important parameters related to the heat of hydration and take the values.According to the construction environment on site,use the finite element software Midas/FEA to analyze the overall temperature field and stress field of the anchor block of Guihua Bridge,and obtain the temperature field of the anchor block And the stress field changes with time.In addition,a comparative analysis of the temperature field of the anchor block with or without cooling water is carried out,and the specific difference of the change law of the temperature field and the stress field of the anchor block with or without water is explored.(2)The simulation calculation analyzes the influence of different ambient temperature,mold entry temperature,cement content,pipe cooling parameters,convection boundary,etc.on the temperature field of anchor block concrete,and the conclusions are:convection coefficient,ambient temperature,and entry temperature under actual pouring conditions.The optimal value range of the mold temperature,the optimal solution under the various parameter conditions of the cooling water pipe,explore the actual effect of using foam plastic insulation board as the long-term insulation material on the concrete crack control on the concrete surface.(3)Select the first 7 construction stages of the anchor block,and conduct a more indepth study on the layered and divided block mass concrete of the anchor block.The research is mainly carried out from three aspects,including the change law of the temperature field of concrete structures with different thicknesses,the law of the influence of layered pouring on the temperature field of anchor block concrete,and the analysis of the specific differences between the temperature field of concrete one-time pouring and layered pouring.Provide an effective reference for the same type of concrete.(4)Combining the actual situation of anchoring mass concrete pouring,systematically explain the mass concrete hydration heat monitoring process,compare and analyze the measured data and theoretical data,and analyze the reasons for the error between the measured data and the theoretical data.On this basis,improvement measures for temperature control of mass concrete are proposed.(5)Combining the optimal value range of convection coefficient,ambient temperature,and mold entry temperature under actual pouring conditions,and the optimal solution under various parameter conditions of cooling water pipes,considering the inadequacy of concrete temperature control measures in actual construction On this basis,an intelligent water temperature system is proposed.Design an intelligent water feedback adjustment PID controller suitable for mass concrete temperature monitoring,a wireless receiving system platform developed based on the Lab VIEW software platform,and an integrated device for controlling flow and temperature installed in the cooling water pipe.The system has the following characteristics:the temperature is measured by a digital temperature sensor,and the cooling water pipe is equipped with a flow temperature integration device,which realizes the remote real-time online collection and feedback adjustment of complex water information.In addition,a simulation test was conducted on the intelligent water-passing temperature system of large-volume concrete,and it was concluded that the flow of cooling water was accurately adjusted to ensure the stability and accuracy of the water flow of the cooling water,and it could prevent the cooling rate of concrete from being out of specification and caused by the extensive flow of cooling water.Water waste. |
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