JPH0516264Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a device that can selectively take water from a water layer at any depth when taking irrigation water from a dam, reservoir, etc.

[Prior Art] Techniques that have been developed for this purpose are broadly divided into the porous type (Fig. 6), the cylinder type (Fig. 8), and the multistage type (Fig. 7). However, although the construction cost of the porous type is relatively low, the accuracy of water intake selection is low; the cylinder type has good water intake accuracy, but the construction cost is high; and the multistage type is intermediate between the two, and the construction cost is There are advantages and disadvantages to both, and water intake accuracy has not always been satisfied.

The applicant proposed a "selective water intake device" (Utility Model Publication No. 16661/1981, Figure 9 A, B, and C) and was able to reach a tentative solution to this problem.

As shown in the figure, this technology involves lifting door bodies 1aA, 1aB, 1aC, etc., which are arranged vertically in multiple stages and in a single row facing the water-conducting surface of the water intake section, sequentially from the top, as shown in the figure. An opening is formed between the door bodies,
The gist is that water can be selectively taken from the water layer at any depth by utilizing the density difference of water inside and outside the door body from the opening in the lowest water layer of this opening.
Moreover, it has a simple structure, can be produced at a low cost, is economical, and has excellent operability, and the upper and lower ends of the door body that is not used for water intake are in contact with the upper and lower ends of other adjacent door bodies. It is said that it has excellent effects such as being able to maintain watertightness when it comes in contact with the water.

In addition to this type of proposal (hereinafter referred to as "multiple type"), there is also a "multiple type surface water intake gate".
(Japanese Unexamined Patent Publication No. 61-38008) can also be found, but since the basic idea is the same, they will be omitted here. However, in all conventional technologies except for this type and the one shown in FIG.
It is customary to install the discharge pipe 4a so that it can be raised and lowered to open and close the discharge pipe 4a.

Furthermore, for maintenance reasons, it has become common practice to erect an inspection stand 5a above the normal water level in order to inspect the water intake door body.

[Problems to be solved by the invention] In addition to solving the problems of the conventional technology, the multiple gate has completed a means for opening a plurality of water intakes 12 on the water intake side to selectively take in water at any depth.

However, when there are multiple openings in the water on the water intake side, the water of the desired propulsion is taken in by utilizing the difference in density at each water depth on the water intake side (difference in water pressure between shallow and deep places). It is extremely difficult to make a perfect selection, such as 0 water intake from the upper opening and 100% water intake from the lower opening. This ratio changes depending on the water pressure difference, so even if the opening position is the same, it will also change depending on the water level, and the purpose is to avoid the turbid water above and select clear water below. Looking at it, I have to say that it is still inadequate.

In order to solve this problem, the present invention aims to add functions that better meet the purpose to the multiplex gate.

[Means for Solving the Problems] The selective water intake gate according to the present invention is a conventionally known multiple gate, in which a water shield plate that blocks the space between the water intake door body and the water control door body is attached to the water control door body. The above problem was solved by attaching it detachably.

[Operation/Embodiment] FIGS. 1 to 4 are front sectional views of embodiments of the present invention. Figure 1 shows that the water level on the intake side (upstream side) is H.
However, due to the previous flood, the water near the surface has become cloudy, indicating that water is being taken from deep in the middle.

The positions of the plurality of water intake gate bodies 1A, 1B, and 1C are adjusted according to known techniques to form openings 0 ₁ and 0 ₂ , but depending on the water pressure difference, the opening 0 is mainly located at a desired water depth. Water flows in from ₂ . On the other hand, although there is no inflow from openings 0 _{and 1} , most of the water from above flows here because the space between both door bodies is almost blocked by the water shield plate 3 attached to the water control door body 2. Therefore, it will not mix into the lower discharge pipe 4.

Figure 2 shows the state in which surface water is being taken in, and since the water-blocking action is unnecessary at this time, the water-blocking door body 2 and the water-blocking plate 3 are combined and moved upward, and can be used as an inspection stand. can perform a function.

Figure 5A shows a front sectional view in Figure 2,
The water control door 2 and the water shield plate 3 are connected to bolts and nuts 6 and 7.
Let's connect and act together.

Figure 3 shows the water control door body 2 being used for its original purpose, descending until it reaches the front of the discharge pipe 4, blocking the discharge pipe, cutting off the flow of water, and inspecting the interior. do. The screwed state shown in Fig. 5A is maintained as it is, and the water shield plate sinks almost to the bottom of the water along with the water control door body.

FIG. 4 shows an aspect when inspecting the water control door body 2 itself. At this time, the screws between the water shielding plate and the water control door body as shown in Figure 5A are removed, and the water shielding plate is attached to the side of the concrete weir body and bolts as shown in the side cross-sectional view of Figure 5B. Screw in 8. The door body and divided water shielding board will be used as scaffolding for inspection, fulfilling a new role. Incidentally, FIG. 5C is a plan view showing the overall positional relationship.

[Effects of the invention] Since the invention of the present application has the above-mentioned effects, it almost completely realizes water intake only from desired positions, and eliminates water intake from undesirable positions. The members added to this device can carry out inspections on the top and bottom, which have conventionally been necessary, so the device as a whole is simplified and is also advantageous in terms of maintenance.

[Brief explanation of drawings]

Fig. 1 to Fig. 4 are front sectional views showing the operation of the embodiment of the present application, Fig. 5A, 5B, and 5C are front, side, and plan views of the same part, Fig. 6 to Fig. 8 are front sectional views showing different prior art, and Fig. 9A, 5B, and 5C are front sectional views showing yet another prior art. 1... Water intake gate body, 2... Water control gate body, 3... Water barrier plate, 4... Discharge pipe.

Claims (1)

[Scope of utility model registration request] In a selective water intake gate consisting of a plurality of intake gate bodies stacked vertically in a row so that they can be opened and closed, and a water control door body that is independently movable up and down inside the gate, the space between the intake door bodies and the water control door body is A selective water intake gate characterized by a water blocking plate removably attached to the water control gate body.