Construction full-period concrete arch dam temperature control curve model

Abstract

The invention discloses a construction full-period concrete arch dam temperature control curve model. The concrete arch dam temperature control curve model comprises four continuous stages, wherein the four stages are respectively (1) a heating period, from a machine outlet of the concrete mixing plant to the highest temperature after warehousing and pouring; (2) a cooling period, from the highesttemperature to the arch sealing temperature designed by the arch dam, wherein a whole-course continuous smooth cooling scheme is adopted in the period; (3) a temperature control period, from reachingthe sealing temperature to the end of the heat exchange; and (4) a rising period, from the end of water passing heat exchange to the completion of overall construction of the arch dam, wherein a mainmonitoring index is temperature rising. The construction full-period concrete arch dam temperature control curve model provided by the invention is applied to construction of large-volume medium andlow-heat concrete arch dams; and in combination with an intelligent water passing temperature control system, the highest temperature of the concrete arch dam in the whole construction period can be controlled, the temperature control process is adjustable, temperature control measures can be optimized, the space-time temperature gradient of concrete is effectively reduced, and the cracking risk of a dam is reduced.

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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