An intelligent water cooling control method and system for mass concrete under construction
A large-volume concrete and control system technology, applied in construction, infrastructure engineering, etc., can solve problems such as uncontrollable, crude artificial water cooling methods, and far apart actual effects, and achieve the effect of easy inspection and management
Inactive Publication Date: 2017-03-01
陈志刚
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Problems solved by technology
Its shortcoming is that, due to the unpredictability of the atmospheric environment and the complexity of heat transfer in water-cooling pipes, the actual water-cooling situation has some changes compared with the results simulated by the finite element method, and the traditional technology has insufficient adjustment ability, so it cannot Immediate correction of the changes will lead to the fact that the actual effect is always far from the planned goal; in addition, based on experience, manual sampling and regulation will cause obvious errors or even mistakes in the operation process, and cause the regulation process to lag and affect The actual control effect; in addition, civil engineering industry standards such as "Technical Specifications for Highway Bridge and Culvert Construction" require that "the temperature difference between the inlet and outlet of the cooling water pipe should be less than or equal to 10°C, and the cooling rate of the pouring body should not be greater than 2.0°C / d", artificial water cooling The means are simple and uncontrollable, far from the actual needs
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[0084] Taking a large-volume concrete block with a size of 14m(X)×6m(Y)×4m(Z) as the object, take C30 concrete, and its mix ratio is shown in Table 1 below. Using ANSYS finite element software to simulate the temperature field of the traditional water cooling technology, the technical scheme of the present invention and the three schemes without water cooling, the solid70 unit is used to discrete the concrete, and the fluid116 unit is used to simulate the function of the water pipe, and the calculation step is set to 1h. The ambient temperature is set at 20°C, the concrete mold entry temperature is 25°C, the diameter of the pipe is 80mm (galvanized iron pipe), the adiabatic temperature rise curve of the concrete adopts a compound exponential formula, and the total heat of hydration of the cement used is Q 0 =330kJ / kg, the thermodynamic parameters of concrete and cooling water are shown in Tables 2 and 3 below:
[0085] Table 1 Concrete construction mix ratio (kg / m 3 )
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The invention discloses an under-construction mass concrete intelligent water cooling control method and system. The under-construction mass concrete intelligent water cooling control system comprises a heat exchange device, a heat exchange auxiliary device and a control device; heat exchange pipelines are a plurality of pipelines arranged in the mass concrete, the heat exchange auxiliary device accurately conveys heat exchange medium to the heat exchange device through mixing and turning of hot and cold water, and can recycle the medium which exchanges heat; the control system acquires the temperature information in the concrete and the temperature information of the heat exchange medium in the pipelines, and accurately controls the heat exchange auxiliary device, and the control method can be programmed in advance and input into the control system. The under-construction mass concrete intelligent water cooling control system can measure the internal temperature of the concrete systematically in real time, furthermore, control strategies can be intelligently customized for concrete hydration moulding different phases, and flexible passing-water temperature and flow are worked out according to the internal radial temperature gradient characteristic of the concrete. The under-construction mass concrete intelligent water cooling control system can recycle the medium which exchanges heat, and therefore the utilization efficiency of materials is improved.
Description
Technical field: [0001] The invention relates to concrete cooling, in particular to an intelligent water cooling control method and system for large-volume concrete under construction. [0002] technical background: [0003] Massive concrete will generate a lot of heat during pouring and molding. Because the surface of the concrete dissipates heat quickly and the center of the heat dissipates slowly, it will form an obvious temperature gradient between the center of the concrete and the surface of the concrete, resulting in corresponding temperature stress and cracking the concrete. Cracks form. There are some technical means corresponding to the control of mass concrete cracks from the design point of view to the construction point of view, among which the more common ones are: selection of cement and ingredients with low heat of hydration, optimization of concrete mix ratio, control of concrete pouring temperature, block pouring And optimize the structural form, etc., the ...
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IPC IPC(8): E02D15/00
Inventor 陈志刚
Owner 陈志刚