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Method for calculating equivalent temperature field of large-size concrete based on cooling water monitoring

A large-volume concrete and equivalent temperature technology, applied to the direction of the thermometer that gives the difference, can solve the problems of lack of clear specifications and processes

Active Publication Date: 2012-10-10
TSINGHUA UNIV +1
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  • Application Information

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Problems solved by technology

[0004] With the development trend of refined temperature control and procedural quality management in modern mass concrete projects, the monitoring content of cooling water information is gradually enriched, and there is no technical obstacle to realize the full synchronous monitoring of inlet and outlet water temperatures, but How to correctly monitor and apply these data, there is no clear specification and process for systematic guidance

Method used

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  • Method for calculating equivalent temperature field of large-size concrete based on cooling water monitoring
  • Method for calculating equivalent temperature field of large-size concrete based on cooling water monitoring
  • Method for calculating equivalent temperature field of large-size concrete based on cooling water monitoring

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Embodiment approach

[0029] 1) First establish the database structure, which includes concrete material information table, concrete pouring information table, cooling water flow record table and calculation information table. The information organization form in each data table is as follows figure 1 As shown, the underline in the figure indicates the primary key in the table.

[0030] 2) Measure the material number, specific heat, density, thermal conductivity and heat of hydration parameters of at least one concrete used in the project through experiments, and enter them into the concrete material information table; among them, through relevant measuring instruments in the indoor test Specific heat, density, and thermal conductivity can be measured. The heat of hydration curve can be measured through the adiabatic temperature rise test. After a certain fitting, the relevant heat of hydration parameters can be obtained. In general engineering, the heat of hydration curve in the form of an index is...

Embodiment

[0051] In the specific implementation, relevant tests were carried out for a concrete warehouse in a large concrete dam project during a certain construction period. The concrete pouring volume of the warehouse is 4358m 3 , Water faucets and water meters were installed at the inlet and outlet of the cooling water pipes in the warehouse. Since the warehouse was poured, monitoring personnel were arranged to manually collect the water temperature and flow rate of the inlet and outlet every 6 hours, and recorded it, and then returned to the office for input. in the database. The test period starts from the pouring date and ends 237 days after the pouring of the warehouse.

[0052] In the indoor test of the concrete for this project, the measured specific heat of the concrete is 0.985kJ / kg°C, and the density is 2663kg / m 3 , the thermal conductivity is 7.70kJ / mh°C. Since the mix ratio used contains a certain amount of fly ash, the heat of hydration curve measured by the test is bet...

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Abstract

The invention discloses a method for calculating an equivalent temperature field of large-size concrete based on cooling water monitoring, and relates to a method for monitoring cooling water and a method for calculating an equivalent field in the period of constructing large-size concrete. Based on the prior art, by laying related monitoring instruments and combining a database technology, the invention provides a method for calculating heat absorbed by a cooling water pipe and realizes the emulational simulated calculation of the equivalent temperature field of concrete in the construction period. The full-process monitoring, data management, calculation and simulation system of the cooling water of a concrete engineering is provided by the method, and the temperature developing state of the large-size concrete in the construction period can be deeply known under the direction of the method.

Description

technical field [0001] The invention relates to a monitoring method for cooling water flow during mass concrete construction and a calculation and simulation method for an equivalent temperature field. Background technique [0002] As an important measure in the temperature control of mass concrete, the laying of cooling water pipes can effectively limit the temperature peak inside the concrete and control the temperature development process, which plays an indispensable role in modern mass concrete construction. A large number of scholars have carried out related research on its calculation methods. Among them, the United States Bureau of Reclamation as a representative in the world has derived a series of theories for long-buried water pipes during the construction of early large concrete dams such as the Hoover gravity arch dam. Solution (Bureau of Reclamation, Cooling of concrete dams: final reports, Bureau of Reclamation, 1949), in China, represented by Zhu Bofang, prop...

Claims

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Application Information

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IPC IPC(8): G01K3/10
Inventor 胡昱李庆斌林鹏左正汪志林周绍武罗丹旎
Owner TSINGHUA UNIV
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