A temperature control curve model of concrete arch dam in the whole construction period

Abstract

The invention discloses a temperature control curve model of a concrete arch dam in the whole construction period. The temperature control curve model of the concrete arch dam consists of four consecutive stages. The four stages are (1) heating period, from the exit of the concrete mixing building to the highest temperature after pouring into the warehouse; (2) cooling period, from the highest temperature to the design sealing temperature of the arch dam, during the period Adopt a continuous and smooth cooling scheme throughout the whole process; (3) temperature control period, from reaching the arch sealing temperature to the end of water heat exchange; (4) recovery period, from the end of water heat exchange to the completion of the overall construction of the arch dam, the main monitoring indicators are The temperature rises. The temperature control curve model of the concrete arch dam in the whole construction period provided by the present invention is applied to the construction of large-volume medium and low heat concrete arch dams, and combined with the intelligent water flow temperature control system, the maximum temperature of the concrete arch dam in the whole construction period can be controlled, The temperature control process can be adjusted and the temperature control measures can be optimized, which can effectively reduce the space-time temperature gradient of concrete and reduce the cracking risk of the dam.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower engineering, and in particular relates to a temperature control curve model of a concrete arch dam in the whole construction period. Background technique [0002] The problem of cracks in dam concrete construction has not been effectively solved. The main reason is that in addition to the complex construction conditions in the construction stage, the implementation of many temperature control measures during the construction process is inevitably interfered by human factors. Many concrete dams with cracks are caused by the failure of the internal temperature to cool or protect the surface according to the design requirements, so that the stress of the dam concrete during the construction period exceeds the standard and cracks appear. [0003] Excessive temperature stress during construction is one of the important reasons for concrete dam cracking. The temperature problem ...

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Problems solved by technology

[0002] The problem of cracks in dam concrete construction has not been effectively solved. The main reason is that in addition to the complex construction conditions in the construction stage, the implementation of many temperature control measures during the construction process is inevitably interfered by human factors.

However, the temperature control curve model proposed by the existing patents is mainly based on the traditional temperature control strategy of "combination of three-stage and nine-stage control and drop". In the process, the maximum temperature control rate of concrete is not high, the temperature control process is discontinuous, the temperature gradient is large, and the temperature control measures are not optimized, which increases the cracking risk of the dam.

At the same time, the traditional temperature control process only focuses on the process of the dam from the completion of the pouring to the arch sealing grouting, without considering the continuous transition from before pouring to the post pouring and the continuous long-term observation of the concrete temperature after the arch sealing grouting, that is, the concrete dam has not been realized. Temperature control management throughout the construction cycle

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