Control method for highest temperature interval of high-arch-dam low-heat cement concrete

A high-temperature, low-heat cement technology, which is applied in the direction of using electric means for temperature control, can solve the problems of unsatisfactory opening of transverse joints in the dam bank slope and dam section, and achieves favorable hydration reaction, flexible temperature control operation, The effect of accelerating early strength development

Active Publication Date: 2021-03-09
POWERCHINA HUADONG ENG COPORATION LTD
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Problems solved by technology

like figure 2 As shown, a high arch dam uses low-heat cement concrete in an all-round way, and the opening of local transverse joints on the bank slope of the dam body during the construction period is not ideal

Method used

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  • Control method for highest temperature interval of high-arch-dam low-heat cement concrete
  • Control method for highest temperature interval of high-arch-dam low-heat cement concrete
  • Control method for highest temperature interval of high-arch-dam low-heat cement concrete

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Embodiment Construction

[0021] The present invention is described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] a. According to the traditional arch dam concrete temperature control design method, generally refer to the arch dam design specification and temperature control calculation analysis to determine the (quasi) stable temperature field and allowable temperature difference standard of concrete. In this embodiment, refer to "Concrete Arch Dam The recommended values ​​for the allowable temperature difference of foundation concrete in Design Code DL / T5346-2006 are shown in Table 1, so as to determine the maximum temperature control standard T 0 .

[0023] Table 1 Allowable temperature difference of foundation concrete (unit: ℃)

[0024]

[0025]

[0026] b. Through the finite element temperature control simulation calculation of arch dams (or the whole dam), calculate the opening of the dam's transverse joints during the temperature drop pr...

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Abstract

The invention provides a control method for a highest temperature interval of high-arch-dam low-heat cement concrete. The characteristics of the low-heat cement concrete are combined, and the advantages of the low-heat cement concrete can be exerted to improve the crack resistance safety of dam concrete, the influence on the joint grouting quality of the transverse joint due to too small opening degree of the transverse joint in the construction period of the arch dam caused by too low maximum temperature control of concrete can be prevented, and the arch sealing integrity of the arch dam is ensured; too low maximum temperature control of concrete can be prevented, and particularly, when the environment temperature in autumn and winter is low, the highest temperature of the low-heat cementconcrete is easier to be too low. After the lower limit value of the highest temperature of the concrete is set, the highest temperature can be properly increased by adjusting a concrete pre-coolingmeasure, a water cooling measure and the like, so that the temperature control cooling engineering quantity and investment are obviously saved; and after the highest temperature interval control standard is set, the temperature control operation on the concrete in the actual construction process is more flexible, and field construction control is facilitated.

Description

technical field [0001] The invention relates to a control method for the maximum temperature range of low-heat cement concrete of a high arch dam, which is suitable for high arch dams using low-heat cement concrete in water conservancy and hydropower projects, and controls the maximum temperature of the concrete during construction. Background technique [0002] With the construction and development of my country's water conservancy and hydropower projects, in recent years, through the progress of building materials manufacturing technology and the gradual application of hydropower projects, low-heat cement has been successfully applied to concrete high arch dams, which reduces the pressure and difficulty of concrete temperature control and provides dam Excellent temperature control and anti-cracking have brought huge engineering and economic benefits. [0003] Due to the composition of its mineral components, the low-heat cement has relatively low early hydration activity of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D23/19
CPCG05D23/19
Inventor 郭传科徐建荣张春生何明杰张伟狄刘西军吴伟伟吴航通彭育王毅
Owner POWERCHINA HUADONG ENG COPORATION LTD
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