A device and method for detecting leakage of dam insulation layer and concrete

Abstract

The invention provides a device and a method for detecting the leakage of heat-preserving layer and concrete of a dam. The device comprises a plurality of semi-closed protection boxes arranged betweenthe inner surface of the dam heat-preserving layer and the outer surface of the dam concrete, wherein a humidity sensor is arranged in the semi-closed protection boxes. In addition, the invention also provides a corresponding arrangement method and a detection method. According to the invention, the humidity data of the heat-preserving layer and the dam concrete can be detected in real time through the humidity sensor embedded between the concrete surface on the upstream and downstream of the dam and the inner surface of the heat-preserving layer, the leakage point and the leakage condition of the dam can be judged in time through an analysis of the abnormal high humidity data, technical support is provided for the development of follow-up dam concrete crack repairing work, meanwhile, large-area damage to the heat-preserving layer is reduced, and maintenance cost of the dam is reduced.

Description

technical field [0001] The invention relates to the technical field of concrete construction in water conservancy projects, in particular to a device and method for detecting leakage of a dam insulation layer and concrete. Background technique [0002] The change of dam body temperature is not only affected by its internal heat of hydration, but also by the external environment temperature. During the dam operation period, the dam body temperature is mainly affected by the ambient air temperature and the reservoir water temperature. When the outside air temperature changes sharply, the temperature inside the dam body has no time to change, resulting in the formation of a large temperature gradient inside and outside the dam body, resulting in temperature cracks. At present, thermal insulation measures are mainly taken for the dam body to reduce the heat exchange between the dam body and the outside world, thereby reducing concrete cracking caused by cold waves or periodic ch...

AI Technical Summary

Problems solved by technology

[0007] 1. Lag leading to the discovery of dam leaks

[0008] Considering the unknown size of the water seepage and the size of the pores between the dam body and the insulation layer, when the leakage amount is small and the pore space is large, it may be necessary to wait for the seepage water to fill the entire pore pressure and break through the insulation layer When the intensity is high, the water seeps from a certain point on the surface of the insulation layer and is finally discovered by the dam operation management personnel. This lasts for a long time, which leads to the lag of discovery and treatment, and often misses the opportunity of early detection, early treatment and early recovery. Additional impact on engineering safety

[0009] 2. Lead to uncertainty in the location of dam leakage

[0010] The pores on the insulation layer and the surface of the dam are unknown. When the pore area is large, the seepage points formed on the surface of the insulation layer after the seepage water fills the pores often do not coincide with the leakage points of the dam body, which leads to the fact that even if the dam is found It may not be possible to accurately locate and repair cracks and water seepage, which adds additional construction procedures and costs to crack repairs

[0011] 3. Hiding the destructiveness of water at low temperature

[0013] Under the above hazards, usually when the dam leaks are found, in order to find the water seepage site, the insulation layer must be removed. The usual method is to dismantle the inspection from the water outlet point outside the insulation board, and some demolish it for more than ten meters. No water outlet point can be found even tens of meters away. The demolition area is huge and consumes manpower and material resources. When the leakage point is finally found and the cracks are treated, the part of the removed insulation board must be restored. In this way, the extra time from demolition to restoration will be Cause additional human and material resources and economic investment

Most concrete dams have a large surface insulation project area, and most of them have additional protective layers outside the insulation layer. The method of cleaning up the original insulation layer and resetting the insulation layer is complicated and expensive.

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