Method and device capable of regulating temperature of concrete dam permanently

Abstract

The invention provides a method and device capable of regulating the temperature of a concrete dam permanently. According to the method, the inside temperature and surface temperature of concrete of a dam body are acquired in real time by cooperatively using an original safety monitoring net of the dam and monitoring equipment buried in the dam, the inner and outer layer temperature difference of the dam is effectively intervened and intelligently regulated, thereby being kept within an allowed range all the time, and manual participation is not needed in the whole process. The device is arranged at the same time of pouring construction of the dam, and temperature control is realized through conveying pipelines which are arranged under the surface layers of concrete of the upstream surface and the downstream surface of the dam in parallel and carry temperature compensation liquid. A novel dam heat preservation mode is created, pure passive heat preservation is changed into active temperature regulation, the dam can automatically operate, the temperature of the concrete dam can be regulated during construction, and the temperature of the concrete dam can be permanently regulated after the dam is constructed and operates. Dam cracks are greatly reduced, and the permanent protection function is achieved.

Description

Technical field [0001] The invention relates to the technical field of water conservancy project construction, in particular to a method and device that can permanently control the temperature of a concrete dam. Background technique [0002] The dam concrete volume of water conservancy projects is huge, and there are many cracks in concrete dams at home and abroad. The occurrence of concrete cracks is the result of a combination of many factors. In addition to external factors such as structural stress, uneven foundation deformation, and accidental factors such as earthquakes, the internal volumetric deformation of concrete such as temperature deformation, autogenous volume shrinkage, dehydration shrinkage, and Other shrinkage deformations related to concrete volume deformation can cause concrete cracks, in which the stress caused by the temperature gradient plays a leading role. [0003] Although since the 1930s, water conservancy engineers have begun to pay attention to how to p...

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Problems solved by technology

When water cooling is carried out, the effect is good at the place where the water pipe is buried between the layers, but the rest of the parts between the two layers cannot achieve the expected effect, forming a weak part that is easily damaged;

[0008] (2) Since this method is carried out simultaneously with concrete pouring and arranged in parallel, the temperature control device laid in front will be damaged when pouring in the next warehouse, making it impossible to effectively control the temperature;

During the operation, the temperature in the water level change area changes greatly and frequently, which will generate a large temperature stress and cause cracks. However, the layout of this method adopts the horizontal compartment layout, which cannot accurately determine the concrete surface and the external environment in the water level change area. Effective protection by temperature exchange is limited to the concrete temperature control during the construction period;

[0010] (4) The temperature control method has a single control means, only relying on manual measurement and control, there is no real-time data acquisition system and specific control strategy, and it is impossible to quickly and accurately compensate the temperature of the concrete. When the amplitude is high, a large temperature stress will be generated on the concrete surface, which will easily lead to cracking of the dam;

[0011] (5) This method adopts segmental cooling treatment, which has poor precision and low efficiency, and cannot meet the overall coordination of temperature in multiple dam sections of the dam, etc.

[0012] In addition, the authorized announcement number "CN 102852145 A" disclosed the "Intelligent Temperature Control Method and System for Dam Concrete under Construction", which only explained the temperature control method of the dam under construction, mainly for the temperature inside the concrete of the dam under construction. It is impossible to control the temperature of the dam during the operation period. Secondly, this document mainly provides an idea for the feasibility of intelligent temperature control of concrete dams as a whole. It has not been put into engineering practice for the time being, so there is no Specific performance and parameters are disclosed

The authorized announcement number "CN 101701495 A" discloses the "individualized water flow method for mass concrete temperature control", which is mainly aimed at supplementing and perfecting the existing traditional dam concrete internal temperature control technology, that is, using water conservancy projects Commonly available cooling water pipes mainly use the method of changing the flow rate, supplemented by changing the cooling water or river water, to cool down the inside of the dam concrete. It does not have the effect of heating up and has no possibility of intelligence

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