System for automatically controlling temperatures in concrete construction periods

Abstract

The invention discloses a system for automatically controlling temperatures in concrete construction periods. The system is characterized in that detected actual temperature data are converted by the aid of an FX2N-4AD-PT analog-digital conversion module, then are transmitted a programmable logic controller by a temperature sensor and are transmitted to a personal computer by the programmable logic controller, measured temperature duration curves are compared to preliminarily given temperature duration curves by visual control system software in the personal computer, valve opening values can be obtained by means of feedback, are transmitted back to the programmable logic controller and then are converted into current signals by an FX2N-2AD digital-analog conversion module, and valve opening of electric ball valves can be controlled. The system has the advantages that the internal temperatures of concrete can be automatically developed along with the optimal temperature duration curves under the precise control of the system, temperatures of surface steel formworks can be controlled, and accordingly temperature gradient of concrete surface layers can be within set ranges under the precise control of the system.

Description

technical field [0001] The invention relates to a temperature control system, in particular to an automatic temperature control system during concrete construction. Background technique [0002] During the construction of concrete structures, concrete cracks during construction due to temperature stress exceeding the tensile strength of concrete are common. Measures such as water pipe cooling and surface insulation can better control the temperature stress of concrete, thereby preventing the generation of cracks. Judging from the scientific research and engineering practice in the past ten years, the scientific research on hydraulic concrete temperature control has reached a relatively mature level, especially the concrete construction simulation algorithm considering cooling water pipes and surface insulation has been able to achieve high accuracy. However, the on-site implementation of cooling water pipes and surface insulation is often unsatisfactory, resulting in the an...

AI Technical Summary

Problems solved by technology

There are three specific reasons: First, the understanding of construction managers and construction personnel is not deep enough. They think that construction is a rough job, and there is no need to do it carefully, and they are relatively lax in thinking

Second, the quality of grass-roots construction operators (cooling water pipe operators) is uneven. Many construction personnel have insufficient understanding of temperature control and crack prevention, and cannot carry out temperature control work in strict accordance with the requirements. cannot be guaranteed 100%

Third, the temperature control measures, especially the water pipe cooling measures, are more detailed in engineering applications. The position of the cooling water pipe in the concrete, the flow rate of the cooling water, the spacing of the water pipes, and the inlet temperature all have strict requirements, and the construction process is often not very good. implement these detailed requirements

Therefore, many construction units are unwilling to add insulation materials on the outer surface of the formwork. Even if the measures of external insulation of the formwork are adopted, these insulation materials often fall off due to strong winds.

[0008] In addition, the thermal insulation capacity of these thermal insulation materials is fixed, but in fact concrete requires different thermal insulation strengths at different ages or under different weather conditions, so thermal insulation materials with a fixed thickness are not the optimal thermal insulation method

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