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High-attitude-area dam upstream face antiseepage coating and construction method thereof

A high-altitude, coating technology, applied in the field of concrete surface anti-seepage coatings, dam concrete surface anti-seepage coatings, can solve the problems of accelerated corrosion of steel bars, decreased life of hydraulic structures, frequent freezing and thawing of concrete, etc., to achieve good adaptability , the effect of good anti-seepage performance

Active Publication Date: 2016-02-24
CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When dams and other water-retaining structures are in operation, water from the upstream reservoir can easily seep into cracks, coupled with frequent sudden changes in temperature, resulting in frequent freezing and thawing of concrete in cracked areas, accelerating the occurrence of freeze-thaw damage to hydraulic structures; for hydraulic reinforced concrete structures Because of leakage, it will also accelerate the corrosion of steel bars, etc.
Moreover, these diseases will form a chain reaction and a vicious circle with leakage, which will seriously affect the durability of hydraulic concrete, lead to a significant decline in the life of hydraulic structures, and cause extremely adverse effects on the safe operation of the project, and even cause dam failure. and other extreme safety accidents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1. Construction of upstream anti-seepage coating for a power station in the middle reaches of the Yarlung Zangbo River

[0029] The material and technology of the present invention are applied in the anti-seepage of the upstream dam face of a hydropower station in the middle reaches of the Yarlung Zangbo River. The hydropower station is a normal concrete gravity dam. The dam site is high above sea level, the climate is dry, the winter is severe, and the daily temperature difference is large. The project is constructed all year round without winter breaks, and there may be defects in concrete pouring. In order to improve the anti-seepage level of the dam's water-retaining structures, the design requires that the concrete within a certain elevation range upstream be protected by an anti-seepage coating before the dam is impounded.

[0030] Adopting the material and supporting construction technology of the present invention, the upstream anti-seepage coating const...

Embodiment 2

[0032] Example 2. Demonstration construction of anti-seepage coating on the overflow side weir of a water conservancy project in the upper reaches of the Nianchu River in Tibet

[0033] The material and construction technology of the present invention have been used as a demonstration construction in the anti-freeze and anti-seepage repair and protection of the overflow side weir concrete of a water conservancy project in the upper reaches of the Nianchu River in Tibet. The hub mainly focuses on irrigation and power generation, and also has comprehensive benefits such as flood control and tourism. The project scale is large (II), with a reservoir storage capacity of 155 million m3 and a Xinli storage capacity of 83 million m3. After completion, the effective irrigation area will be 450,000 mu. The installed capacity of the hydropower station is 20,000 kW, and the designed annual average generating capacity is 61 million kilowatt-hours. The project was opened for water storage ...

Embodiment 3

[0036] Example 3: Experimental construction of anti-seepage coating for canals in the Manla irrigation area of ​​Tibet

[0037] Tibet's Manla Irrigation District is located in the Nianchu River Basin in the upper reaches of the Yarlung Zangbo River. The irrigation district controls the land from the lower reaches of the Manla Reservoir to the banks of the Nianchu River estuary that can be irrigated by gravity and pumping water. The total controlled area is 530,000 mu, and the designed irrigation area is 426,800 mu. Eleven canal systems have been built in the irrigation area, with a large number of channels and water-lifting structures. Due to the high altitude of the irrigation area and the severe cold in winter, some concrete channels suffer from freezing damage and leakage to varying degrees, which is a serious hazard to the healthy operation of the channels.

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Abstract

The invention discloses a high-attitude-area dam upstream face antiseepage coating and a construction method of the coating. The coating is characterized in that the coating is high-elasticity modified epoxy resin cement gum for a seamless common concrete surface, and the thickness is about 1mm; the antiseepage coating for a structural joint, a telescopic joint, a construction joint and other crack portions is composed of a bottom layer, a middle layer and a surface layer; and the bottom-layer coating is low-viscosity epoxy resin with the thickness being about 0.1 mm to 0.2 mm, the middle layer is toughening cloth with the thickness being 0.5 mm, and the surface layer coating is a nano-modified polyaspartate polyurea with the thickness ranging from 0.5 mmm to 1.0 mm. The antiseepage coating is economical and practical, has the good antiseepage performance, meanwhile has the good adaptation to the special severe environment of the high-attitude area and has the very important effect on the security service of the water conservancy project.

Description

technical field [0001] The invention belongs to the field of dam concrete surface anti-seepage coating, and specifically refers to a concrete surface anti-seepage coating used for painting on the upstream surface of a dam under special environmental conditions in high-altitude areas and a construction method thereof. Background technique [0002] my country's high-altitude areas, such as Tibet and Xinjiang, are rich in hydropower resources, but their development and utilization rate is only about 0.45%. During the medium and long-term planning period of the Tibet Autonomous Region, it is planned to invest a lot of money to solve the problems of engineering power and water shortages in Tibet. Carry out the construction of large and medium-sized backbone hydropower and water conservancy projects, and the development of hydropower in this area will be the focus of our country in the future. Because the hydraulic structures in these high-altitude areas are in a special and harsh ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B3/16C09D163/00C09D7/12
CPCC09D7/61C09D7/65C09D163/00E02B3/16C08L21/00C08K3/36
Inventor 陈亮崔同欢肖承京李超毅石妍范志勇李家正崔光泽魏涛
Owner CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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