SU1281630A1 - Water passage structure - Google Patents

Abstract

The invention relates to a hydraulic structure, in particular to a culvert, consisting of multi-span control structures, a water-supply path in the form of a rapid current and an energy-suppressing device in the form of a water well. In order to reduce construction costs, reduce the overall dimensions of the culvert, by eliminating oblique waves at a current flow and eliminating flow disruptions in the water well, the head of the threshold is flat and the end of the threshold protrudes 1.2 meters below the downstream edge of the intermediate bull. -1.7 (in + t), where B is the span width; t is the thickness of the intermediate bull. The positive effect is to increase the efficiency of the design by reducing the longitudinal walls of the structure and the reliability of the water well under all modes of operation. When a flow is missed by one span behind the intermediate bull, an increase in the end portion of the threshold by a length of 1.2–1.7 (B + t) ensures an even distribution of the specific flow rates and makes it possible to eliminate the formation of oblique waves at the entrance of the flux velocity, 2 AI. . i SL to OO O) 00

Description

The invention relates to a hydraulic structure, in particular to a culvert including a two-span regulating structure, a water-supply path in the form of a rapid current and an energy-absorbing device in the form of a water well.

The purpose of the invention is to reduce the cost of construction, to reduce the overall dimensions of the structure by eliminating oblique waves at rapidity.

FIG. 1 shows a double span culvert; a plan view; in fig. 2 shows section A-A in FIG. one.

The water throughput structure is located between the upper 1 and lower 2 pools of the waterworks, with which it is associated with transition sections 3 and 4. The water throughput construction includes a two-span regulating device with spans 5, threshold 6, outlets 7, intermediate bull 8 and gates 9, for example, flat, set in the grooves 10. The end part of the threshold 6 protrudes towards the downstream 2 beyond the downstream edge of the intermediate bull 8, adjoins the inlet section 11 of the water conducting structure in the form of a rapid current having drainage 12 and iS walls. By the water, the stream is connected to the water well 14.

The upper pool 1 is the reservoir of the hydroelectric complex or its supply channel, as well as the section of the channel located in front of the terrain differential. As the downstream of the bridge 2, there may be a channel connecting the channel or the channel section located below the differential.

The device works as follows;

When a flow is missed by all spans 5 (symmetrical operation of the structure) on the threshold 6, the flat end part of which projects towards the downstream 2, the flows formed by adjacent spans spread beyond the lower edge of the intermediate bull 8. At some distance from the intermediate bull B, the streams join to form a local increase of the free surface, which spreads uniformly in all directions without waves with steep crests. Critical flow depth set

five

0

at the end of the threshold 6, in section 11 at the entrance to the fleet, as a result, in the overlying areas of the threshold

6speeds are less critical and no oblique waves are formed.

When a flow is missed by one span 5 behind an intermediate bull, 8, a one-way flow spreads out towards the usto 7 idle span. Due to the inertia of the flow, the concentration of the specific costs on the wall of the station 7 of the non-working span occurs. With the redistribution of costs across the width of the cross section, there is an outflow of water from the

7 and moving it to the opposite base 7. A scythe reflection wave is formed, moving in a zigzag manner along the grid, and causing an increase in depth compared to the normal ones.

The contact of the expanding flow of a steady 7 non-working span occurs at a distance x / (B + t) of 0.4-0.45 from the lower edge of the intermediate bull, where B is the width of the span, t is the thickness of the bull, and the specific flow rate g . paaline

veins zero. Further, the specific flow rates increase and their redistribution over the span width, as a result of which the uneven distribution of specific flow rates over the cross section decreases.

Ours is the ratio of the distribution of specific consumption, characterized by the value of l. "Vl.o, cc. corresponds to the length of the end portion 15 of the threshold 6 x / (B-ft) 1.2-1.7. Further, the ratio of the specific expenses to the threshold width somewhat decreases, assuming a constant value of the order of 0.65.

0

five

0

Thus, an increase in the end portion 15 of threshold 6 by a length (1.2–1.7) (in + t) of the total width of the inactive span and the thickness of the intermediate bull provides on the threshold a uniform distribution of unit costs.

and prevents the formation of oblique waves at the entrance to the speed of flow.

The positive effect of using the invention is to increase the efficiency of the structure by reducing the longitudinal construction of the structure due to the elimination of waves at a current and the elimination of failure // // // /// /

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FIG.

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Claims (1)

Claim A culvert, including a two-span control device, equipped with gates installed between the abutments and the intermediate bull on the threshold, the flat end of which is protruding towards the lower pool beyond the lower edge of the intermediate bull, characterized in that, in order to reduce the cost of construction., Reduce overall sizes 5 of the structure by eliminating oblique waves at the fast flow, the head part of the threshold is made flat, and its end part protrudes toward the bottom, its tail beyond the lower edge of the intermediate bull for a length equal to 1.21.7 (B + t), where B - span width, t - bull thickness.