SU1308699A1 - Arrangement for passing ice through hydraulic structure - Google Patents

Abstract

The invention relates to hydraulic structures for passing ice from the backwater of the hydroelectric system to the lower one. The purpose of the invention is to increase the reliability of work by increasing the efficiency of the destruction of ice. The structure is an open channel 1 with a weir 2, walls 3 and a curvilinear threshold 5. With open middle spans 6 weir 2, the free surface of the water before the weir has a complex curvilinear outline, due to which the ice floes are split into small pieces. 4 il. T. so about al O5 so with

Description

The invention relates to hydraulic structures, namely, structures for the destruction and passage of ice through low-pressure hydraulic systems during the operational period, mainly on rivers with high floods and relatively low water consumption during the ice drift period.

The purpose of the invention is to increase the reliability of work by increasing the efficiency of the destruction of ice.

FIG. 1 shows a structure for passing ice, a top view; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one; in fig. 4 shows a section B-B in FIG. one.

The structure consists of an open channel 1 with weir 2, longitudinal walls 3 installed at the bottom of channel 1 before weir 2 and adjoining them, to gobies 4 weir 2, and threshold 5 located in front of walls 3. Threshold 5 is curved in plan, cut in concave side to the spillway 2 with junction of the ends to the longitudinal walls 3. The height of the walls 3 exceeds the water level in channel 1 during the period of ice passing. Position 6 marked the passage holes of the weir between the bulls 4.

The construction for passing ice and water works as follows.

During the period of ice passing, only the central passage openings 6 are open. The flow of water and the ice fields moving on its surface in front of the threshold 5 have a relatively low speed. At threshold 5, the flow rate increases, while the speed at the tip of threshold 5 first increases, the flow is knocked out in cross section, and a decline curve is formed. Closer to the walls 3, the flow enters the threshold 5 somewhat later, therefore the curve of the free surface along the walls 3 is displaced downstream and a concave curve of the free surface forms in the cross section (Fig. 3), while in the central part of the water level is lower than at the guide walls 3. Below (Fig. 4) the picture changes, the free surface becomes convex, i.e. the water level in the central part is higher than that of the walls 3.

Thus, the ice fields at the auxiliary Q under the influence of the complex shape of the water surface break up into separate curvilinear bands. Then (downstream), these bands break into two parts, since the water surface in the central part of stream 5 decreases significantly. Moving between the vertical flow walls 3, these ice floes break apart in section B-B into smaller ice floes already under the influence of a convex water surface formed due to the curvilinearity of threshold 5. The ice breaking is facilitated by the reduced strength of the upper ice layers. Formed small ice floes enter the central passage holes 6 and further into the lower pool.

0

Claims (1)

Invention Formula A structure for passing ice through a hydraulic structure, containing an open channel with a weir, installed at the bottom of the channel and adjacent to the gobym. Weirs, longitudinal walls and a threshold located in front of the walls, differ in terms of increasing the reliability of ice crumbling, the threshold is made curved in plan, with the concave side facing the weir with the ends adjoining the longitudinal walls, the walls being made with a height greater than the threshold height. u /// ///// xss 9 y v / / / ////// /// / / // // // // Ft gg 5-6 & & h v h hVvvc oh J 7Fig.Z 3 5 Fi.CH