The input end of the tubular siphon spillway

 

(57) Abstract:

Use: in the construction, tubular siphon spillway hydraulic structures. The inventive head contains the front and rear walls 1 and 2, made in the form of semi-cylinders of the pipe segment, and the side walls 3 of the two triangular elements 4 of a cylindrical curvature with equal angles, vertices, which are located at the intersection of the edges of the walls 1 and 2. Side 5 elements 4 are located on the generatrix of the cylinder. When working siphon spillway water enters the hole formed by the walls 1, 2 and 4 elements, and then through the syphon pipe is discharged into the lower reach. 2 Il.

The invention is intended for use in hydraulic construction, in particular in the construction of flood siphon spillway dams ponds and reservoirs.

The known method the tip of siphon spillway, including the top front wall of the half pipe and connected to her side of the quarter pipe wall (ABT. St. N 1538563, CL E 02 B 7/18. The input end of the siphon spillway).

The disadvantage of this input tip is that the lower part of the input is not protected from the suction air is Hells pounds of siphon spillway over five meters.

Known input end of siphon spillway, joined from lengths of pipe, the mating politicy which are cut at equal angles ("Method of manufacturing the input headroom tubular siphon spillways").

This design input tip has several disadvantages. Because the structural elements are made from whole pieces of pipe after fit is a lot of waste source material. The semi-cylinders, joined in the middle part of the tip, have a curvature towards the inside of the socket and thereby exclude the part of the square of the input, thereby reducing its capacity.

The closest technical solution is the input end of the tubular siphon spillway, including front and back panels, made in the form of semi-cylinders of the pipe section located at an acute angle concave faces toward each other, and side walls, each of which is made from a flat sheet of a triangular shape and attached the sides to the edges of the front and rear walls with the location of the vertex of the angle at the point of intersection of these edges ("Method of making water headroom tubular siphon spillways").

This construction direction and under the power of the vacuum generating oscillations, causing vibration of the entire structure. For this same reason, the input tip has a low strength in the horizontal transverse direction.

The width of the input end length constant and equal to the diameter of the used tubes. As a result, the taper of the socket is vertical and surface flow, suitable to the structure and having a horizontal orientation is forced in the input tip is to roll in a vertical direction. This causes a strong turbulence of the flow along the side walls with the formation of eddies and the inflow of large amounts of air, reducing the expense of construction. In addition, the presence of the bell only in the vertical direction causes for the formation of a required area of the suction flow to significantly increase the length of the front wall of the tip, but when this is removed the area of the suction from the beginning of the pipeline, as a result growing the hydraulic losses due to the length of the tip, increasing its flow resistance and decreases the transmission power.

The aim of the invention is to increase the strength and bandwidth of the input end of the siphon spillway.

This objective is achieved in that the form equal angles, peaks which are located at the intersection of the edges of the front and rear walls, and side elements attached to the edges of the front and rear walls, are located on the generatrix of the cylinder.

In contrast to the known technical solutions, in which the side walls are made from flat sheets of a triangular shape, in the proposed design input end of each side wall is made in the form of two elements of the cylindrical curvature of a triangular shape with equal angles, vertices, which are located at the intersection of the edges of the front and rear walls, and side elements attached to the edges of the front and rear walls, are located on the generatrix of the cylinder.

These symptoms are new, as it does not coincide with the known shape and the achieved result.

Run each side of the input end of the two elements of cylindrical curvature allows us to give the other side a positive curvature, thus increasing their stiffness and strength of the tip in the horizontal direction. The application of the side walls of the two elements of cylindrical curvature increases compared to the prototype area of the absorption by about 60% or decreases the length of vanaprasthi, and the width of the sucked flow increases to two times.

The above properties show signs of the claimed technical solution, allow to conclude that compliance with a criterion of "significant differences".

In Fig. 1 shows the structure of an input cap, side view; Fig. 2 - the same, top view.

The input end of the tubular siphon spillway (Fig. 1) includes 1 front and 2 rear wall, made in the form of semi-cylinders of the pipe section located at an acute angle concave faces toward each other, and side walls 3, each of which docked two elements of the cylindrical curvature of the triangular form 4. The 5 elements 4 attached to the edges of the front 1 and rear 2 walls are located on the generatrix of the cylinder, and the mating sides 6 are located at equal angles "" to the same generatrix.

The device operates as follows. When the water level rises in the reservoir, the stream flowing through the siphon spillway, makes the air out and creates a vacuum. The input tip distributes the vacuum area of the inlet, thereby creating a suction force of siphon spillway. Due to the convexity of the front is his force of atmospheric pressure without deflection and vibration design which greatly increases its strength. The increased strength also contributes to the fact that the sides 5 are adjacent to the edges of the front and rear walls at right angles, forming four corner profile with high resistance in the perception of stress.

When the absorption of a suitable flow of water height position of the front 1 and rear 2 walls provides capture of flow depth, and the planned location of the side walls 3 provides capture of the stream width. The width of the captured stream is approximately two times greater than its depth.

The claimed design input end of the tubular siphon spillway due to krivolineynoe all walls design and education longitudinal angular profiles at their dock has a higher stiffness and strength and thereby eliminates the possibility of vibration of structures due to the instability of the design of the entrance.

Application in the design of the input side walls of the two elements of cylindrical curvature can significantly increase the area of the entrance and the width of the tip. This in turn reduces the overall length of the tip, to bring the area of suction to the conduit structure and thereby reduce the hydraulic is reset, twice its depth, allowing for normal hydraulic approach flow to the building it without the formation of turbulent jets and suction air, reducing the expense of the spillway.

The above hydraulic properties of the claimed design input cap increase its throughput compared to the prototype.

The proposed solution allows to exclude from the design water head flat sheet and make all abutting elements only from the pipe, which makes the manufacturing process, the input tip is more adaptable.

The claimed design input tip can be used as a model satisfying all the requirements for the entrance of the siphon spillway.

(56) USSR Author's certificate N 1431400, CL E 02 B 7/18, 1986.

USSR author's certificate N 1448780, CL E 02 B 7/18, 1985.

The INPUT END of the TUBULAR SIPHON SPILLWAY, including front and back panels, made in the form of semi-cylinders of the pipe section located at an acute angle concave faces toward each other, and side walls, each of which has a triangular shape and attached side is tives such as those that, to improve strength and throughput, each side wall is made in the form of two elements of the cylindrical curvature of a triangular shape with equal angles, vertices, which are located at the intersection of the edges of the front and rear walls, and side elements attached to the edges of the front and rear walls, are located on the generatrix of the cylinder.

 

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