JP2628296B2 - Movable screen for water diversion - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable screen structure applied to an intake for diverting water from a water channel to a destination.

[0002]

2. Description of the Related Art Water from rivers is used for various purposes such as agricultural water, water supply, road watering, and snow removal. These are water conveyance methods that use the height difference of the terrain to conduct water from the fixed weir of the river into the bank, reach the irrigation canal, and further divert the water using the canal gradient, and distribute water from the irrigation canal and distribute it by pipeline etc. Irrigation business is increasing.
In these cases, if waste can be stopped before the water diversion stage,
Secondary processing can be simplified and automated, which can avoid problems at the water distribution stage.

Conventionally, water diversion from an irrigation canal is damped using a weir plate in the irrigation canal, and is often led to an open ditch such as a U-shaped gutter, soil feather, or a masonry canal. In addition, a management method has been implemented in which a wire mesh is attached to a diversion port or a junction basin and artificially removing attached waste.

[0004] Today, labor saving is also advocated in these parts, and in particular, in agriculture, a method of dividing water from an irrigation canal and performing pipeline irrigation is often employed in order to reduce production costs. In this pipeline irrigation, an automatic water supply valve is attached to each field, and is controlled according to the water level of a paddy field. In such a distribution system terminal, the pipe diameter is small, so if the refuse flows down to this point, the automatic water supply valve will be clogged,
You have to keep in mind that it can cause major trouble.

[0005] Therefore, in order to prevent waste from entering such a terminal, a screen used for a water intake of a water pipe is important. As a rough screen for the intake, a row of V-shaped steel materials was set up at a certain angle against the running water so that the downstream side would be at a higher position, and the refuse was transferred to the upper layer above the running water surface. However, a combination of power for the scraping is indispensable, and the equipment cost is close to that of the automatic scraping screen. Also,
This type of screen is inconvenient because the finer the screen, the smaller the aperture ratio and the smaller the amount of flowing water, so a wide screen is required, and the screen is not compatible with the size of the water channel. In addition, many irrigation canals also serve as drainage for rainwater,
In this case, since the automatic screen that blocks the irrigation channel becomes an obstacle, it is devised to install it only as necessary, but the equipment cost and the burden of maintenance are increased.

[Problems to be solved by the invention]

[0006] The irrigation canals are generally open canals, and the length of the canals is long, and many of them also serve as living water, drainage, and agricultural water for settlements. Falling stones and garbage can lead to increased debris, which is often a problem during the pipeline irrigation stage.

[0007] When the water is made into a pipeline, the slit (mesh width) of the screen is desirably 5.0 mm or less in view of the size of the waste to be prevented, thereby performing fine dust treatment. Is required. In addition, when a normal wire mesh is used for the screen, the slender garbage is stitched on the stitches, so that the garbage does not peel off with running water, and therefore, a screen structure and arrangement that are less likely to clog these garbage are required. Further, it is desirable that the clogged screen be one that can be separated and swept away by a troublesome manual operation, that is, a simple operation such as moving the screen back and forth instead of directly removing the waste with a prop or hand.

[0008] Water distribution from the irrigation channel is generally premised on raising the water level with a weir plate or the like and adjusting the water level to secure the water flow. The weir plate in the cross direction of the water channel is used for removing sediment pools and during rainfall. It must be removed once. Therefore, there is a need for a method of maintaining the same water level as the weir plate and not raising the bottom of the irrigation channel by using only the screen without such a weir plate.

[0009] In addition, since a large number of branches from the irrigation canals are installed due to the topographical reasons and the cost of laying the pipeline, the equipment cost of the installation screen is low and commercial energy such as electric power is required. What is not required is required. Therefore, in summarizing these problems, the water channel diversion screen has a screen structure that is fine and has a small amount of dust, is an easily reproducible screen, also serves as a weir plate, and is inexpensive. And that it can be handled by elderly people, women and women, etc.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a water intake of a diversion pipe opened on one side wall of an irrigation channel along the side wall so as to cover from the irrigation channel side. Screen, wherein the screen body is composed of a wedge bar row, and a portion of the irrigation channel downstream from the center portion thereof is arranged corresponding to the intake port, and more than the intake port The screen edge upstream of the water channel is hinged to the side wall, the screen edge downstream of the water channel from the intake port is separated from the side wall, and the operating lever projects from the upper end of the downstream edge. A flexible or resilient plate or canvas is inserted between the downstream edge and the side wall surface of the irrigation channel downstream of the water intake opening, and the edge and the side wall are further inserted. With an elastic member between By doing so, water flowing substantially from the entire surface of the screen flows into the intake port, and the sine component force received from the water flow in the irrigation channel and the elastic member according to the downstream end separation angle between the screen and the side wall. The work of balancing the tension of the, the state of the water flow with the wave, and the fluctuation of the flow path resistance of the screen according to the separation angle, etc., and can give irregular and gentle natural vibration to the screen. A movable screen for water channel diversion is provided, in which the lever is operated to swing around the upstream side edge as a fulcrum axis so that the waste adhering to the screen is shaken off.

In the above construction, the irrigation canal is generally three-faced concrete and has a gradient of 0.50-0.
A flow rate of 80 m / sec is maintained. As the diversion pipe, a fume pipe opened on the side wall of the irrigation channel is often used, and the diversion pipe flows down at a natural gradient. The diameter of the fume pipe, that is, the diameter of the water intake, is calculated as the water separation amount.

The wedge bar constituting the screen is formed, for example, by shaping a round bar into a wedge-shaped cross section and supporting the arrangement thereof by a support material. The opening width on the main stream side of the irrigation channel is narrow, and the opening width on the water diversion side is small. A wide slit is formed, and one side of the bottom of the wedge is in contact with the main flow of the irrigation channel, and the entire length of the screen in the flow direction is located at an angle close to parallel to the flow. .

[0013]

Generally, if a screen is provided at an angle of 90 ° with the irrigation channel immediately before the water intake, the cross-sectional area of the flow path to the water intake is narrowed, and the flow velocity is increased by that amount, so that adsorption occurs.
According to the configuration of the present invention described above, the screen surface is separated from the intake opening by the downstream side of the irrigation channel, so that the screen surface passes through the slit of the screen, which is considerably larger than the intake opening. Flow velocity is 0.07m /
In less than a second, the continuous flow rate in the water distribution pipe is about 1 / 0.7 of 0.70 m / sec.
Since it is 10, the adsorption of garbage can be sufficiently avoided. The aperture ratio of the wedge bar screen is preferably about 4
0% or more, and accordingly, a considerable screen area is set.

In other words, the screen along the flow divides the water to generate a flow velocity that passes through the slit, and as described above, if it is at an angle of 90 ° with respect to the water channel, the screen is pressed by the flowing water to exert an effect. Although the garbage is adsorbed, in the configuration of the present invention, the screen extends from the upstream side of the irrigation canal to the downstream side in a planar arrangement, and is preferably one.
Since it has a wedge-shaped bulging shape at an angle of 0 ° or less, the diversion channel inlet (water intake) is kept at a distance from the screen surface, and the water flowing from the entire surface of the screen has the flexibility and elasticity at the downstream end of the screen. And the whole amount will enter the water intake. As a result, as described above, the flow velocity of the water flowing through the slit is reduced, and the waste that reaches the front of the screen is pushed by the main irrigation canal, moves downstream, and flows down the irrigation canal. become. In addition, the wedge-shaped projection of the screen forms a kind of edge that protrudes against the flow,
As long as the flow is not divided, the collision of the running water causes an action of sweeping out the waste, so that the waste can be prevented from hitting the screen.

In the downstream side of the screen, the bending state of the flexible and elastic plate is adjusted by changing the angle of separation from the water channel wall surface, and the water channel width of the water intake is adjusted according to the size of the curved protrusion. Can be adjusted, and the water level can be adjusted.

However, in the irrigation canal, there is a case where a simple trash removal function along the front of the screen as described above cannot sufficiently exert a trash cleaning effect due to a change in water flow or a variation in the amount of trash. In this case, the natural vibration of the screen body plays an important role. This is, as described above, the screen works to balance the sine component force received from the water flow in the irrigation channel according to the downstream end separation angle between the side wall and the tension of the elastic member, and the state of the water flow accompanied by the wave motion,
This is obtained by a change in the flow path resistance of the screen according to the separation angle (including an expansion / contraction effect of the flow path restrictor, and microscopically, an action of the Karlman vortex in the water flow after passing through the slit).

Further, by manually pulling the lever at the downstream end of the screen toward the side wall of the irrigation channel, the coil spring is compressed, and conversely, the screen is rocked by loosening the force and returning (extending), thereby causing the above-mentioned natural flow and natural vibration. The waste that could not be removed can be washed away.

[0018]

1 and 2 are a front view and a side view, respectively, showing a structure and an attached state of a movable screen for diversion of a water channel according to the present invention, wherein 1 is the ground, 2a and 2b are both side walls of an open type water channel. In one embodiment, the movable screen 3 has an upstream edge supported on one side wall 2a via a hinge 4, and a downstream edge having the frame plate 5 is provided on the side wall 2a.
It is possible to move within a suitable angle range at an interval from. The main body of the screen 3 is a large number of stainless steel wedges having a maximum thickness of about 5 mm, which are also installed between the frame plate 5 and the movable side of the hinge 4 with an appropriate gap (for example, 5.0 mm). It consists of an array of bars 6. The wedge bars 6 are arranged such that the bottom side (the maximum thickness side) of the wedge-shaped cross section is in contact with the main stream of the irrigation channel, and a plurality of vertical support bars 7 are attached to the arrangement of the wedge bars 6 from the back side. I have. In this state, as shown in FIG. 3, the wedge bar 6 is inserted into the V-shaped cut provided in the support rod 7.
Are fixed and welded in such a manner that the tip end side of the wedge fits.

The movable screen 3 is attached to the side wall 2a in such a manner that the water inlet 9 of the water dividing fume tube 8 opened in the side wall 2a is located at a position downstream of the water channel from the center of the screen. It has become.

FIG. 4 shows the details of the state of attachment of the screen 3 to the side wall 2a and the movable support structure on the downstream end side. The movable support structure is shown in more detail in FIG. The fixed side of the hinge 4 connected to the upstream edge of the screen is fixed to the side wall 2 a via the fixing plate 10, and the rotating side of the hinge 4 is fixed to the upstream edge of the screen 3 via the connecting plate 11. Is done. At the downstream edge, the frame plate 5
Is provided with a guide hole 12 (FIG. 5), in which a side wall 2 is formed.
The distal end of the threaded guide rod 13 protruding from the corresponding portion of a is passed through. In this case, the threaded guide rod 13 projects from the mounting plate 14 having an upper surface inclined by 10 ° in accordance with the set angle (for example, 10 °) of the movable screen 3 according to the inclination. A spring washer 15 having a screw hole itself is fixed to the portion so as to be adjustable in position. A coil spring 16 is press-fitted around the guide rod 13 between the spring washer 15 and the frame plate 5. The thread of the spring washer 15 is not provided with a thread groove.
The upper and lower portions may be fastened with nuts (not shown). A wing nut 17 is applied from the tip of the threaded guide rod 13 to contact the front of the frame plate 5 to regulate the separation angle of the screen 3. An operation lever 18 is vertically fixed to a downstream edge at an upper portion of the frame plate 5, and an upper end of the operation lever 18 is sufficiently protruded from a water surface position of the irrigation channel so that it can be manually operated from the shore. A rubber plate having a suitable elasticity and flexibility, or one end of a canvas 19 which has been subjected to elastic support bone or resin processing is fixed to an upstream edge on the back surface of the frame plate 5. Irrigation channel side wall 2
It is fixed to the upstream end side of the mounting plate 14 fixed to a. This board or canvas extends over substantially the entire height of the screen 3, so that the separation angle of the screen 3 becomes narrower, and the screen 3 protrudes toward the upstream side as the degree of flexure becomes closer to the side wall 2 a, and the flow control for the water intake 9 is performed. It exerts its effect. Desirably, two fins 20 are projected at right angles from the front of the frame plate 5 so as to block the water flow in the irrigation channel, which is useful for promoting natural vibration of the screen 3.

The structure of the basic embodiment is as described above. Water flowing from the entire surface of the screen 3 is guided to the water inlet 9 in accordance with the angle of separation from the water channel to the side wall 2a. Even if the garbage attached to the bar is washed down by the main stream component of the irrigation channel to the downstream of the irrigation channel, or is likely to be inserted between the wedge bars, the screen itself is irregular, as described above, and Natural vibrations are generated slowly, and can be generally eliminated downstream of the irrigation canal. Further, when the water distribution is cut off, a synergistic effect of the action of the edge and the natural vibration is obtained, and the screen can be regenerated by effectively sweeping the waste.

In the event that dust is deposited on the screen or clogging of foreign matter on the wedge bar occurs, the operation lever 18 at the downstream edge of the screen is manually operated. A large swing is generated, which makes it possible to shake off the refuse and the sediment attached to the screen.

FIGS. 6 and 7 show another embodiment of the screen. In this case, the wedge bars 7 'constituting the screen are not vertically laid but arranged vertically, and are positioned on the main stream side of the irrigation channel. The horizontal tangent line on the bottom wall side of the wedge-shaped cross section having the screen is separated from the surface of the side wall 2a by an angle S _{1 of the} screen.
Is disposed at an angle slightly larger than (+ S ₂ ), so that the waste 21 hitting the back of the wedge bar 7 ′ from the main irrigation channel is repelled toward the main irrigation channel by the cam action of the bottom surface of the wedge bar, and easily. What separates.

[0024]

As described above, according to the present invention, the irrigation canal without sedimentation is performed, and a screen having a considerably larger area than that of the intake port is used. Since the speed is relatively small in relation to the flow velocity of the main irrigation canal, it is difficult to pass the waste,
In addition, the screen has a wedge-shaped structure that protrudes from the waterway wall in a wedge shape, and the waste attached to the screen can be shaken off by the action of running water and the vibration of the screen that can occur naturally, or by artificial shaking. It provides a movable screen for diversion of irrigation water that can be used unattended for a long time without requiring power, etc., and does not require heavy work even during periodic inspection and manual operation. is there.

[Brief description of the drawings]

FIG. 1 is a front view showing an attached state of a water dividing movable screen in a basic embodiment of the present invention.

FIG. 2 is a partial cross-sectional side view seen from the left side (downstream side) of FIG.

FIG. 3 is a partial perspective view showing a structure of a screen main body.

FIG. 4 is a schematic plan view showing a screen mounting and movable support structure.

FIG. 5 is a partial sectional view showing details of a movable support structure of the screen.

FIG. 6 is a plan view showing an example of a separate sheet of the movable screen for water distribution.

FIG. 7 is a partially enlarged view of FIG. 6;

[Explanation of symbols]

 2a, 2b Both side walls of open type water channel 3 Movable screen 4 Hinge 5 Frame plate 6 Wedge bar 7 Vertical support rod 8 Fume tube 9 Water intake 13 Threaded guide rod 15 Spring washer 16 Coil spring 17 Wing nut 18 Operating lever 19 Canvas 20 fin

Claims (5)

(57) [Claims] 1. A water diversion screen provided along a side wall of an irrigation channel so as to cover an intake of a diversion pipe opened on one side wall of the irrigation channel from the irrigation channel side, wherein the screen main body is formed of a wedge bar row. And a portion of the irrigation channel downstream of the central portion thereof is disposed corresponding to the intake port, and a screen edge on the irrigation channel upstream side of the intake port is hinged to the side wall, and the intake port is provided. The screen edge on the downstream side of the irrigation channel is further away from the side wall, and an operating lever protrudes from the upper end of the downstream edge, and the irrigation channel on the downstream side from the downstream edge and the intake port. By bending and inserting a flexible or elastic plate or canvas between the side wall surface and the elastic member between the same edge and the side wall, substantially the screen Water flowing from the whole surface Flows into the intake port, and the screen acts to balance the sine component force received from the water flow in the irrigation canal and the tension of the elastic member in accordance with the downstream end separation angle between the screen and the side wall. Based on the fluctuation of the flow path resistance of the screen according to the separation angle, irregular and gentle natural vibration can be given to the screen, and the lever is operated to support the upstream side edge as a fulcrum. A movable screen for diverting a water channel, wherein the sewage attached to the screen is shaken by swinging as an axis. 2. A guide hole is provided at the downstream edge, and a threaded guide rod is protruded from a side wall surface of the irrigation channel corresponding to the guide hole at a predetermined separation angle of the screen, and a tip of the guide rod is provided at the end. Pass through the guide hole, and further fix the spring washer by its own through screw hole in the middle part of the guide rod or through a screw engaging member so that the position of the spring washer can be adjusted freely. Between the back surface of the edge, a coil spring constituting at least a part of the elastic member is press-fitted, and a lock nut is fastened to a guide rod passing through the guide hole from the surface side of the downstream edge. The screen according to claim 1, wherein a maximum separation angle is regulated by locking a surface and adjusting a position of the spring washer. 3. The screen according to claim 1, wherein a fin for promoting the natural vibration is attached to the downstream edge. 4. The screen according to claim 1, wherein a mechanical vibration mechanism is provided between the screen and a side wall of the irrigation channel. 5. When each wedge bar constituting the screen is in an upright state, the bottom side of the wedge-shaped cross section is arranged in a vertical lattice so as to be in contact with the main flow of the irrigation channel, and a horizontal tangent passing through the bottom side of the wedge-shaped cross section. The screen according to any one of claims 1 to 4, wherein the screen is fixed to the side wall surface at an angle larger than the separation angle of the screen.