JPS624573Y2 - - Google Patents

Description

[Detailed explanation of the idea]

This invention relates to a water intake block for waterways. A canal water intake block is used when it is necessary to branch off a canal and take water from the canal, such as in a rice field. In other words, a water intake block with a water intake for water intake is installed at an appropriate location in a waterway formed by a gutter block, etc., and the water intake is usually closed with a gate such as a water stop plate. By opening the channel, water flows out from the channel to the water outlet. This type of block has traditionally been T-shaped with a water outlet extending perpendicular to the waterway, but especially when the waterway is deep,
If the slope of the waterway is steep and the water flowing through the waterway is fast, it may be difficult to get the desired amount of water from the water outlet, so stones or boards may be piled up near the water mouth to slow the flow, or in extreme cases, water intake blocks may be installed. After installing the water spout, the water spout is broken to widen it. However, even when stones and boards are piled up near the water outlet, the stones and boards are often washed away or broken, making it impossible to draw water from the water outlet as expected. This invention was devised in view of the shortcomings of the conventional water intake block for waterways, and its gist is to make the waterway near the water intake block deeper and gradually widen the waterway near the water mouth. This invention will be explained below using examples shown in the attached drawings. As shown in FIG. 1, this water intake block for waterways has an inlet 1, an outlet 2, and an intake 3. A still water pond 4 is located between the water intake 1 and the outlet 2.
As shown in Fig. 2, this still water pond 4 is formed by steps 11, 21, 31 and walls 5 to 7 extending from the inlet 1, outlet 2, and intake 3 toward the center of the water intake block. surrounded by Also, water intake 3
The water stop plate 8 is installed as shown in Figure 2 except when water is being taken in.
A water stop groove 32 into which the water is fitted is formed. The walls 5 and 6 are not parallel to the wall 7, and the distance from the wall 7 gradually increases from the inlet 1 and the outlet 2 to the water intake 3, respectively. The state of use of the water intake block for waterways having the above configuration will be explained using FIGS. 2 and 3. Figure 3 shows an example of this water intake block installed in a waterway such as a rice field.
It is connected to 3. The water intake block and the water channel blocks 10, 13 are connected by a water inlet socket 9 or by a connecting pipe 12. Third
In the figure, water enters the water intake block from the waterway block 10 side as shown by the arrow in the waterway from left to right in the figure, and flows out from the water intake block via the waterway block 13. Water flowing from the channel block 10 flows into the still water pond 4 via the inlet 1 and the stage 11. When the still water pond 4 is full, water flows out through the outlet 2 of the stage 21 into the water channel block 13. At this time, since the central portion 4a of the still water pond 4 is wider than the inlet 1, the flow velocity at the central portion 4a of the still water reservoir 4 is slower than the flow velocity at the inlet 1. In addition, by providing the still water pond 4, the flow velocity of water entering from the inlet 1 is further reduced by the action of the water cushion.
As is clear from the experimental results described below, the flow of water near a is much slower than that near the inlet 1. Therefore, when the water stop plate 8 is opened to take in water, a larger amount of water can flow out from the water intake port 3 than when a conventional T-shaped plate is used. Next, the results of experiments conducted using the water intake block for waterways of this invention will be explained using the table below.

[Table] In the above table, (1) to (3) are those in which a still water pond is not provided, and a water intake block is used in which the width of the waterway around the water mouth is gradually widened.As shown in Figure 4A, water flows through the waterway. Water flows from block 10 to channel block 13 via an intake block. Here, A, B, and C indicate the water depths at the illustrated positions of the water channel blocks 11 and 13, respectively. In addition, (4) to (7) use a water intake block with a still water pond and the width of the waterway around the water mouth gradually widened, and the water is collected in the same way as in cases (1) to (3), as shown in Figure 4B. As shown in FIG. 2, water flows from the waterway block 10 to the waterway block 13 via the water intake block. In cases (4) to (7), a weir is provided on the downstream side of the waterway block 13 for the purpose of slowing down the downstream speed of the waterway. 〓mark indicates further width of waterway
This shows the flow rate at the water outlet when using a waterway widened by 10 cm.By widening the waterway width, the flow velocity in the still water pond further slowed down, and the amount of water flowing into the water mouth increased. Further, l in the table indicates the distance from the inlet of the still water pond to the point at which bubbles are generated when the water outlet is opened. Furthermore, in Figure 4 A and B, L is 2.
It is m. Furthermore, when the water outlet is opened to take in water, waves with foam are generated near the upstream side of the waterway's water outlet, but the position where these waves are generated is the same as when a still water pond is not installed ((1) ~
Compared to (3)), the cases (4) to (7) were located on the upstream side of the waterway due to the water cushioning effect of the still water pond. As is clear from the above experimental results, the water intake block of this invention can slow down the flow velocity at the water mouth by providing a water cushion effect by providing a still water pond and by gradually widening the channel width around the water mouth. It has an effect. Due to the synergistic effect of these two actions, the amount of water taken from the water outlet can be increased compared to the conventional draft.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams showing an embodiment of this invention, and FIGS. 3 and 4A and 4B are explanatory diagrams showing the usage state of the embodiment of this invention. 1...Inlet, 2...Outlet, 3...Water intake,
4... Still water pond, 5-7... Wall, 8... Water stop plate, 9
... Water outlet socket, 10, 13 ... Channel block, 11, 21, 31 ... Stage, 12 ... Connection pipe,
32...Water stop groove.

Claims (1)

[Claims for Utility Model Registration] The system has an inlet 1, an outlet 2, and an intake 3, and part of the water flowing from the inlet to the outlet is branched and flows out from the intake. For waterways, the width of the waterway from the inlet and outlet to the water intake is gradually widened, and the depth of the waterway from the inlet and outlet to the water intake is deeper than that of the waterway at the inlet and outlet. Block.