Siphon type flood discharge device suitable for saline-alkali soil dam

Abstract

The utility model belongs to the technical field of water conservancy projects, and relates to a siphoning type flood discharge device suitable for a saline-alkali soil dam. The siphoning type flood discharge device suitable for the saline-alkali soil dam is characterized by comprising a first pipeline, a second pipeline, a third pipeline and a fourth pipeline which are sequentially connected; the first pipeline is located on a dam slope on one side of a water body, one end of the first pipeline is buried below the water surface to serve as a water inlet, and a one-way valve is arranged at the water inlet; the second pipeline is shallowly buried below a dam soil layer and is higher than the water surface of the water body; a water injection valve and an exhaust port are arranged on the second pipeline; the third pipeline is located on a dam slope on one side of the flood discharge area; the tail end of the fourth pipeline is used as a water outlet, and a water outlet valve is arranged at the water outlet; and the altitude of the water outlet is lower than that of the water inlet. According to the utility model, active flood discharge can be realized under the condition that the dam body is not damaged, the cost is low, the raw materials are easy to obtain, the structure is simple, the operation is simple, and the device is a controllable normalized flood discharge device.

Description

Technical Field

[0001] The utility model belongs to the technical field of water conservancy engineering, relates to a dam flood discharge device, and specifically relates to a siphon type flood discharge device suitable for saline-alkali soil dams. Background Art

[0002] For small lakes / water bodies that do not have special flood discharge gates, excavation or buried pipes are often used on relatively primitive earthen dams to facilitate flood discharge. The disadvantages of excavation flood discharge are obvious: it causes damage to the environment, the gap is often larger and larger and difficult to control, and it is difficult to repair, the repair cycle is long, and the repair cost is high. Directly buried pipes are usually inclined pipes with high water inlet end and low flood discharge end to drain water by gravity. Usually, the height of the pipe inlet is generally near the water surface and is soaked in water for a long time.

[0003] In the Gobi Desert or salt desert with high salt content, there is a lack of clay that can withstand water immersion. Saline-alkali soil containing a certain amount of salt is often used to build dams. This type of soil is not easy to form and is prone to water seepage and collapse when soaked in water.

[0004] Taijinaier Lake is the tail lake of the downstream of Nalinggele River, located in the center of Qaidam Basin. The surrounding soil is mostly saline-alkali soil. Around 2010, in order to exploit mineral resources, various companies built dams to divide Taijinaier Lake from east to west into East Taijinaier Lake, Yahu Lake and West Taijinaier Lake. Yahu Lake is a freshwater lake that inherits the water of the original main lake. The water source of Nalinggele River mainly comes from the melting ice and snow of Kunlun Mountain. The water volume increases greatly in spring and summer every year. With global warming, the water volume in the flood season is also gradually increasing. A flood discharge method that is easy to manage and can be stable in the long term is needed.

[0005] According to the above, flood discharge on the dam built beside Yahu Lake needs to avoid excavation, and at the same time, the characteristics of saline-alkali soil that cannot withstand water immersion should be taken into consideration. To achieve the effect of flood discharge at a low cost, the siphon principle is a better method. The siphon principle uses the pressure difference of the water column to make the water rise and then flow to the lower place. Since the water surface at the pipe mouth is subjected to approximately the same atmospheric pressure, the combined pressure on the side with a short water column is large and the combined pressure on the side with a high water column is small. The water will flow from the side with a large combined pressure to the side with a small combined pressure. Utility Model Content

[0006] In view of the above problems, the utility model provides a siphon type flood discharge device suitable for saline-alkali soil dams.

[0007] The technical solution adopted by the utility model is as follows:

[0008] A siphon-type flood discharge device suitable for a saline-alkali soil dam comprises a first pipe, a second pipe, a third pipe and a fourth pipe which are connected in sequence; the first pipe is located on the dam slope on one side of a water body, one end of the first pipe is buried below the water surface as a water inlet, and a one-way valve is arranged at the water inlet; the second pipe is shallowly buried under the dam soil layer and above the water surface of the water body, and a water injection valve and an exhaust port are arranged on the second pipe; the third pipe is located on the dam slope on one side of a flood discharge area; the end of the fourth pipe serves as a water outlet, and a water outlet valve is arranged at the water outlet; the altitude of the water outlet is lower than the altitude of the water inlet.

[0009] Furthermore, the depth of the first pipeline buried below the water surface is set to be below the water surface height during the dry season throughout the year, ensuring that the water inlet is completely submerged below the water surface.

[0010] Furthermore, the one-way valve at the water inlet enables water in the water body to be drawn into the pipeline in one direction and prevents water from flowing out of the pipeline.

[0011] Furthermore, elbow joints are provided at the connections of the first pipeline, the second pipeline, the third pipeline and the fourth pipeline.

[0012] Furthermore, the water injection valve is arranged at the water inlet of the second pipeline, and the exhaust port is arranged beside the water injection valve.

[0013] Furthermore, the first pipeline is a rubber pipe, and the second pipeline, the third pipeline and the fourth pipeline are steel pipes.

[0014] Furthermore, it also includes a water pump and a water pumping pipe, which is connected to the water injection valve. When injecting water, the water injection valve is opened, the water outlet valve is closed, and the water in the water body is extracted by the water pump, and the water enters the second pipeline through the water pumping pipe and the water injection valve.

[0015] Furthermore, after the water is filled, close the water injection valve and the exhaust port, and slowly open the water outlet valve to allow the water at the outlet to flow to the flood discharge area. At the same time, negative pressure will be formed in the pipe, driving the water in the pipe to flow to the outlet, forming a siphon effect, and realizing flood discharge from the water body to the flood discharge area.

[0016] Furthermore, the first pipeline, the second pipeline, the third pipeline and the fourth pipeline constitute a flood discharge pipe, and there are one or more flood discharge pipes, and the flood discharge volume is controlled by the pipe diameter and number of the flood discharge pipes.

[0017] The beneficial effects of the utility model are as follows:

[0018] 1) Active flood discharge can be carried out without damaging the dam.

[0019] 2) Low cost, readily available raw materials, simple structure, simple operation, and a controllable normalized flood discharge device.

[0020] 3) The amount of flood discharge can be controlled by the diameter and number of flood discharge pipes.

[0021] 4) According to the test, 40 siphon pipes with a diameter of 40 cm were installed at the Yahu-Dongtai flood control dam, and the theoretical maximum flood discharge can reach 1.3824 million m 3 / d. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of a siphon-type dam flood discharge device in an embodiment.

[0023] In the figure: 1 is a one-way valve; 2 is a rubber tube; 6, 8, 10 are steel pipes; 3, 7, 9 are elbow joints, 4 is an exhaust port, 5 is a water injection valve, and 11 is a water outlet valve. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below through specific embodiments and drawings.

[0025] The utility model utilizes the siphon principle, connects the water body with the flood discharge area, and utilizes the pressure difference from the higher liquid level on the water body side to the lower liquid level on the flood discharge area side to discharge flood water by itself.

[0026] The siphon type flood discharge device of the utility model is as follows Figure 1 As shown, 2, 6, 8, and 10 are the first pipe, the second pipe, the third pipe, and the fourth pipe of the utility model. In this embodiment, 2 is a rubber pipe, and 6, 8, and 10 are steel pipes. In other embodiments, these four pipes can also be made of other suitable materials. A rubber pipe 2 is set on the slope of the dam on one side of the water body, and one end of the rubber pipe 2 is buried below the water surface as a water inlet. The burying depth is set to be below the water surface height during the dry season, which can be controlled according to demand. The purpose is to ensure that the water inlet is completely submerged below the water surface, to ensure that a closed space can be formed when the water body is connected, and to form a siphon effect when pumping water.

[0027] A bottom valve, namely a one-way valve 1, is installed at the water inlet of the rubber tube 2. Water can be drawn into the pipe from the water body in one direction. When water flows into the water body from the pipe, the one-way valve 1 is closed to prevent outflow, thereby keeping the water in the pipe.

[0028] The top of the rubber tube 2 is connected to one end of a steel pipe 6, which is shallowly buried under the soil layer of the dam and is much higher than the water surface. The other end of the steel pipe 6 is connected to steel pipes 8 and 10 in sequence, wherein the steel pipe 8 is located on the slope of the dam on one side of the flood discharge area, and the bends (the connection points of each pipe) are connected with elbow joints 3, 7, and 9. The steel pipe 6 has a water injection valve 5 on the water inlet side, and an exhaust port 4 is left next to the water injection valve 5. The end of the steel pipe 10 serves as a water outlet, and there is a water outlet valve 11 at the water outlet to facilitate filling the pipe with water. The altitude of the pipeline on the flood discharge outlet side should be lower than the water surface, so that the altitude of the water outlet is lower than the altitude of the water inlet.

[0029] When injecting water, close the outlet valve 11, use a submersible pump to extract water from the water body (lake), connect the hose to the water injection valve 5, and open the water injection valve 5. After the water is filled, close the water injection valve 5 and the exhaust port 4 to isolate the pipe from the air, and then slowly open the outlet valve 11. The water at the outlet will flow to the flood discharge area under the action of gravity, and negative pressure will be formed in the pipe, driving the water in the pipe to flow to the outlet, forming a siphon effect, and realizing flood discharge from the water body to the flood discharge area.

[0030] There may be one or more flood discharge pipes formed by the rubber tube 2, the steel tube 6, the steel tube 8 and the steel tube 10, and the flood discharge volume can be controlled by the diameter and number of the flood discharge pipes.

[0031] The specific embodiments of the utility model disclosed above are intended to help understand the content of the utility model and implement it accordingly. Those skilled in the art can understand that various replacements, changes and modifications are possible without departing from the spirit and scope of the utility model. The utility model should not be limited to the contents disclosed in the embodiments of this specification, and the scope of protection of the utility model shall be based on the scope defined in the claims.

Claims

1. A siphon flood discharge device suitable for saline-alkali soil dams, characterized in that: It comprises a first pipeline, a second pipeline, a third pipeline and a fourth pipeline connected in sequence; the first pipeline is located on the slope of the dam on one side of the water body, one end of the first pipeline is buried below the water surface as a water inlet, and a one-way valve is provided at the water inlet; the second pipeline is shallowly buried under the soil layer of the dam and above the water surface of the water body, and a water injection valve and an exhaust port are provided on the second pipeline; the third pipeline is located on the slope of the dam on one side of the flood discharge area; the end of the fourth pipeline serves as a water outlet, and a water outlet valve is provided at the water outlet; the altitude of the water outlet is lower than the altitude of the water inlet.

2. The siphon type flood discharge device suitable for saline-alkali soil dam according to claim 1, characterized in that: The depth of the first pipeline buried below the water surface is set to be below the water surface height during the dry season throughout the year to ensure that the water inlets are all submerged below the water surface.

3. The siphon type flood discharge device suitable for saline-alkali soil dam according to claim 1, characterized in that: The one-way valve at the water inlet enables water in the water body to be drawn into the pipeline in one direction and prevents water from flowing out of the pipeline.

4. The siphon flood discharge device suitable for saline-alkali soil dam according to claim 1, characterized in that: Elbow joints are provided at the connections of the first pipeline, the second pipeline, the third pipeline and the fourth pipeline.

5. The siphon flood discharge device suitable for saline-alkali soil dam according to claim 1, characterized in that: The water injection valve is arranged at the water inlet of the second pipeline, and the exhaust port is arranged beside the water injection valve.

6. The siphon type flood discharge device suitable for saline-alkali soil dam according to claim 1, characterized in that: The first pipeline is a rubber pipe, and the second pipeline, the third pipeline and the fourth pipeline are steel pipes.

7. The siphon type flood discharge device suitable for saline-alkali soil dam according to claim 1, characterized in that: It also includes a water pump and a water pumping pipe, which is connected to the water injection valve. When injecting water, the water injection valve is opened, the water outlet valve is closed, and the water pump is used to extract water from the water body, and the water enters the second pipeline through the water pumping pipe and the water injection valve.

8. The siphon flood discharge device suitable for saline-alkali soil dam according to claim 7, characterized in that: After the water is filled, close the water injection valve and the exhaust port, and slowly open the water outlet valve to allow the water at the outlet to flow to the flood discharge area. At the same time, negative pressure will be formed in the pipe, driving the water in the pipe to flow to the outlet, forming a siphon effect, and realizing flood discharge from the water body to the flood discharge area.

9. The siphon type flood discharge device suitable for saline-alkali soil dam according to claim 1, characterized in that: The first pipeline, the second pipeline, the third pipeline and the fourth pipeline constitute a flood discharge pipe. There are one or more flood discharge pipes, and the flood discharge volume is controlled by the pipe diameter and number of the flood discharge pipes.

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