RU100528U1 - SIPHON WATER DISCHARGE OF SOIL DAM - Google Patents

Abstract

 A siphon spillway of a soil dam containing a spillway channel in the form of a plurality of gravity siphons with a long and short knee thrown over the dam crest, characterized in that a filler tank connected to the siphon is installed on the dam crest, and a valve for regulating the water supply is connected to the connection an additional branch pipe with a shutter is connected to the siphon, a check valve is installed at the inlet of the short knee, and a second shutter is installed at the outlet of the long knee.

Description

The utility model relates to the field of exploitation of soil dams and is intended to protect the object from destruction during the passage of the spring flood.

A known siphon spillway proposed in a method of protecting a dam of a hydraulic structure (RF Patent No. 2263178, class E02B 7/18, 2003). The method consists in creating an additional spillway channel in the form of a plurality of gravity siphons thrown over the crest of the dam. Siphons are collected from pre-prepared nodes, which are delivered to the crest of the dam during the dangerous rise of water in the reservoir. Moreover, the short and long knee of the siphon is installed stationary, lowering the short knee of each siphon under the water level in the upper pool, and the long knee - under the water level in the lower pool. At the same time, a vacuum unit is assembled, the suction chamber of which is connected by a pipeline to the highest point of the siphon. Then the siphons are evacuated, filling them with water.

A significant drawback of this method is the installation of additional pipelines required to start the main system and the use of an external power source for the operation of vacuum pumps.

The objective of the proposed utility model is to prevent the destruction of the soil dam during the spring flood, simplifying the design of the siphon spillway, minimizing the assembly time of the spillway and rejecting an external power source by changing the system startup mechanism.

The problem is solved by a siphon spillway of a soil dam containing a spillway channel in the form of a plurality of gravity siphons with a long and short knee thrown over the dam crest, which, unlike the prototype, contains a filling tank mounted on the dam crest and connected to the siphon; regulation of water supply, while an additional nozzle with a shutter is connected to the siphon, a check valve is installed at the inlet of the short elbow, and a second is installed at the outlet of the long elbow gate.

The essence of the claimed utility model is illustrated in the drawing. In FIG. The scheme of a siphon spillway is given.

The non-return valve 1 is installed at the inlet of the short elbow of the siphon 2. A filler tank 3 connected to the siphon is installed on the dam crest, a valve 4 is installed at the connection, and an additional nozzle 7 with a shutter 5 is connected to the siphon. A second shutter 6 is installed at the output of the long elbow.

The proposed system works as follows.

According to the proposed model, the filling of the siphon 2 occurs from the filling tank 3 through the open valve 4. When filling, the shutter 6 is closed, and the shutter 5, which is designed to displace air from the siphon, is open. When gushing water through an additional pipe 7, the shutter 5 is closed and then the siphon is filled with water. After the filling tank is completely emptied and the siphon is filled, the valve 4 is closed and the valve 6 is opened, due to the difference in the water levels in the reservoir and the river channel, the movement of water (collected in the siphon) will begin, which will lead to the opening of check valve 1 by means of traction. The non-return valve passes water in one direction and prevents its movement in the opposite, acting automatically. The action of the siphon is explained by the fact that the total pressure in the short pressure hole is higher than the total pressure in the long knee hole. The total pressure is calculated as the difference between atmospheric pressure and the weight of the fluid column in the knee. If atmospheric pressure is equal, the weight of the liquid column in the short knee is less than in the long. This pressure difference pushes the fluid up in the short knee, and the fluid flows out of the long knee down. The siphon will not work if the distance between the upper point of the curved tube and the level of the overfilled liquid h is more than 8.5 m.

The capacity of the proposed siphon is determined by the formula:

where D is the diameter of the pipeline, m;

g is the acceleration of gravity, m / s ² (g = 9.81 m / s ² );

H is the difference between the levels of the lower and upper pools, m;

L is the total length of the siphon, m;

- the sum of the coefficients of local resistance;

λ is the hydraulic coefficient of friction. For hydraulically roughened pipes, X is determined by the Shifrinson formula:

where Δ is the equivalent roughness.

So, the claimed utility model allows to prevent the destruction of the soil dam during the spring flood, to simplify the design of the siphon spillway, to minimize the assembly time of the spillway and to abandon the external power source by changing the system startup mechanism.

Claims (1)

A siphon spillway of a soil dam containing a spillway channel in the form of a plurality of gravity siphons with a long and short knee thrown over the dam crest, characterized in that a filler tank connected to the siphon is installed on the dam crest, and a valve for regulating the water supply is connected to the connection an additional branch pipe with a shutter is connected to the siphon, a check valve is installed at the input of the short knee, and a second shutter is installed at the output of the long knee.