SU1522809A1 - Head wall for siphon spillway - Google Patents

Abstract

The invention relates to hydraulic structures of earth dams, in particular to tubular siphon spillways. The purpose of the invention is to reduce material consumption, simplify the design and increase reliability. The inlet tip of the siphon spillway includes a water intake pipe 1 with a notch 2, a movable visor 3 having a hinged connection 4 with the upper edge of the notch 2, a counterweight 5 rigidly connected to the visor 3 and located on the side of the siphon conduit 6. The inner end 7 of the visor 3 is made with lateral oblique cuts 8, which, together with the transverse end 9 of the cutout, form 2 holes 10. an air-hydraulic regulator. While the notch 2 and visor 3 are not flooded with water, the counterweight 5 keeps the movable visor 3 in the raised position. When the water rises during the spring flood (on top of ice), the transverse end 9 and the visor 3 are flooded, after which the siphon spillway is charged and its carrying capacity increases. This causes an increase in the velocity head in the inlet head and an increase in the pressure difference acting on the lowering of the visor 3. When the pressure difference exceeds the forces from the counterweight 5 and the forces of friction and rest acting relative to the hinge joint with F C IVD to 00

Description

and in the direction of lift. The visor 3 is lowered onto the side walls of the intake pipe 1. In this case, the side oblique cuts 8 and the transverse end 9 form the openings 10 of the air-hydraulic regulator. By reducing the level of aode to the holes 10 in the siphon

For an estimate of the leakage, air will flow in, gradually reducing the vacuum and the capacity of the siphon until it is completely turned off from work. After that, the counterweight 5 will raise the visor 3 to its original position. 2. silt

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The invention relates to hydrotechnical / h structures of earth dams can be used in the construction of tubular siphon spillways. The aim of the invention is to reduce material consumption, simplify the design and improve reliability.

The invention is illustrated in the drawing, where Fig. 1 shows the entrance tip of a siphon spillway with a raised visor, side view, and in Fig. 2 - the same 5 with the visor lowered.

The inlet tip of the siphon spillway includes a water intake pipe 14 made with a notch 2 in the upper MacTHj, a visor 3 made as a cut part of the water intake pipe 1 and having a hinge connection t with the top edge of the notch 2, counterweight 5 ,,, rigidly connected to the visor 3 and located 1 (from the side of the conduit 6 of the siphon. The inner end 7 of the visor 3 is made with lateral oblique cuts 8 forming them with the transverse end E of the cut-out 2 holes 10 of the air-hydraulic regulator,

The input end of the siphon spillway works as follows.

While the cut-out 2 of the water intake pipe 1 is in the non-submerged state, the counterweight 5 holds the movable visor 3 in a raised position, therefore in the spring during the initial period of the flood passing over the ice and the reservoir the siphon spillway works in the non-pressure mode. As the water rises, the transverse end 9 is flooded, the 2 W cut-out of the movable visor Ze is followed by an automatic charging of the siphon spillway and an increase in its flow capacity. At the same time, the speed and velocity head RO of the inlet tip 5 and the pressure difference 40 increase.

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Research institutes acting on lowering the movable visor 3. When the pressure difference acting on the rotation of the visor 3 exceeds the force from the weight of the counterweight 5 and the forces of friction and rest acting on the rise of the visor 3, the movable visor 3 will lower and hermetically connect to the side walls of the intake pipe 1. At the same time, the side sections 8 of the inner end 7 of the movable visor 3 together with the transverse end 9 of the notch 2 form triangular openings 10 of the air-hydraulic regulator.

When the water level in the reservoir decreases, the triangular orifices 10 of the air-hydraulic regulator are exposed, through which air will begin to flow into the siphon spillway due to suction, resulting in a gradual decrease in the siphon vacuum and a reduction in the siphon water flow. Sbrsa from work. At the same time, the force that presses the movable visor 3 to the side walls of the water intake pipe 1 will disappear, and under the action of the counterweight 5 of the movable visor 3 will occupy the initial raised position,

Claims (1)

Invention Formula The inlet tip of the siphon spillway, including a water intake pipe located in the upper pool of the water reservoir, connected to the siphon water conduit and cut out in the upper part, vertically movable in the vertical plane, made in the form of a cut part of the water intake pipe having a hinged joint at one end along its upper part and installed in a cut-out with the possibility of hermetic connection with the walls of the water intake pipe, and a counterweight connected to a visor, characterized in that, in order to reduce terialoemkosti, simplifying construction and increasing reliability of the cutout formed in the inlet portion of intake pipe hydrochloric, visor is pivotally connected to the upper edge of the cutout, and a counterweight fixedly connected to the visor and is positioned relative to swivel the visor from vodo10 Editor M.Vasilyeva Compiled by B. Val Tehred L. Serdyukova Order 2 Circulation VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35g Raushsk nab., D. / 5 Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 ; 22809, water siphon, Lree this end of the visor from the side of the swivel is made with side slanting sections in the lowest position of the visor, forming with the end of the cut-out of the intake pipe the triangular leg holes of the air-hydraulic regulator, pointing apex into the 10 side of the hinge joint of the visor. (rig, g Proofreader V.Girn to Subscription