RU1818401C - Spillway end structure - Google Patents

Abstract

The invention relates to hydraulic engineering and can be used to control the discharge flow in order to simplify the construction and reduce the cost of the structure. The pressure face of the springboard is vertical and concave in plan; at the exit of the springboard, a slot is made normal to the spillway axis. The structure includes a supply spillway section, a springboard with a vertical pressure face having a concave outline and equipped with a threshold, and a flow diverter is made on the side wall. 1 s.p. f-ly, 2 ill.

Description

The invention relates to hydraulic engineering and can be used to control the discharge flow in order to reduce the erosion of the bottom and banks at the interface between the discharge stream and the riverbed.

The purpose of the invention is to simplify the construction and reduce the cost of construction while increasing operational reliability.

Figure 1 schematically depicts a plan of an end spillway structure; figure 2 is a section aa in figure 1.

The end spillway structure contains a spillway inlet section 1, a bottom plate 2 with a springboard 3 on it with a vertical pressure face 4. having a curved outline in plan and limited by a threshold 5, the diverter 6 and the enclosing walls 7, mating with the channel of the river 8. and a cut 9, located normal to the axis of the spillway 10.

The height of the springboard is determined by selection on a hydraulic model, based on the necessary division of the discharge flow, ensuring minimal erosion of the bottom and the banks of the channel 8 in the interface.

The end structure works as follows: a spillway chute of water passing through the supply path 1 of the spillway enters the bottom plate 2 of the end structure. Here, the flow meets resistance in the form of a vertical face 4 of the springboard 3 and here the flow is divided into two parts. A part of the flow running onto the springboard 3 rises along the vertical pressure face 4, then moves along the springboard 3 and enters the riverbed 8; the other part is deflected by the vertical face 4 and along this face 4 is directed along the bottom plate 2 through the slot 9 also into the riverbed 8.

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Thus, a stream coming out of the springboard 3, having a direction parallel to the axis of the supplying water aode (and a stream deflected by face 4, assuming a direction along the riverbed when leaving the bottom plate 2 and slot 9, is thus received. by changing the height of the springboard 3, the necessary ratios of the flow rates of these two streams are provided quite simply on the model, forming the desired distribution of areal costs along the downstream mirror, thereby ensuring minimal erosion of the river channel, with the exception of backwater to hydroelectric power stations ra ot deposition of erosion of the shores and bottom of the product stream and., respectively, provide improvement hydropower generation.

The design of the end spillway structure is very simple, as can be seen from the drawing, while allowing to increase the efficiency of the structure, providing

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It minimizes the erosion of the opposite shore and bottom of the channel and thereby reduces the backwater to the hydroelectric power station, which ultimately leads to an increase in electricity generation.

Claims (2)

1. An end spillway structure, including a supply section, lateral enclosing walls, a springboard with a pressure face concave in plan, and a slot located at one side of the springboard exit, characterized in that. that, in order to simplify the design and reduce the cost of the structure, the pressure face of the springboard is vertical and the slot is normal to the axis of the spillway. 2. The construction of pop. 1, characterized in that, in order to increase operational reliability, the pressure face of the springboard is provided with a threshold, and the flow is deflected on the side wall.