Water-stopping panel

Abstract

The present invention provides a water-stopping panel that offers easy operation for stopping water intake at water intakes that do not have a water-stopping device (water-stopping panel), and that prevents water leakage after installation. [Solution] The panel 5 is formed by overlapping two plywood panels 4 in the thickness direction and joining them together, deformable side sheet members 6 are attached to the left and right edges of the panel 5, a block 7 is provided on the front of the panel 5, and a rope 8 is provided for suspending the panel 5. The panel 5 is suspended by the rope 8 and lowered to the front of the screen 3 of the water intake 2, so that the side sheet member 6 contacts the left and right side walls of the water intake 2, thereby blocking the water intake 2.

Description

Technical Field

[0001] The present invention relates to a water stop panel that is lowered to the front of a screen at a water intake to temporarily stop water.

Background Art

[0002] Generally, there is a water intake for taking water from a river into a water intake yard and a sedimentation basin. The water intake includes a screen for removing debris such as driftwood, garbage, and sediment, and a gate (door) for controlling the inflow of water and closing it as necessary to stop water supply.

[0003] Patent Document 1 is an example of a water intake provided with a water stop device for stopping water intake.

[0004] The water stop device is provided with a water stop plate that is openably and closably provided on the surface of the body of the water intake facility, and a water stop plug that is detachably provided inside the water intake and bulges in the radial outer direction to stop water between it and the inner surface of the flow path. The water stop plug includes a main body portion that is inserted into the water intake, a locking portion that is formed at an end of the main body portion and locks to the surface of the body around the water intake to restrict the movement of the main body portion in the direction of the depth of the flow path, and an elastic seal member that is attached to the main body portion and bulges in the radial outer direction by receiving the fastening force of bolts and nuts to press against the inner surface of the flow path pipe.

[0005] For example, in a water intake yard at a hydropower plant, water supply may be stopped for sediment removal work. In this case, water intake to the water intake yard must be stopped.

[0006] If it has a water stop device as in Patent Document 1 above, water intake to the water intake yard can be stopped by driving the water stop device and lowering the water stop plate.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

[0008] However, due to cost considerations, water-stopping plates (gates) are often not installed at the water intake, and only screens are provided. In such cases, to stop the water intake, a plate (such as a panel) is artificially lowered to act as a water-stopping plate and block the intake. This is especially true for relatively small hydroelectric power plants where water outages at the water intake occur only once a year or less, and these plants often do not have water-stopping devices.

[0009] In these hydroelectric power plants, readily available concrete panels (900 x 1800 mm) were used as water-stopping plates. Two ropes were attached to the top of each panel, and two people would hold the ropes to suspend the panels and lower them onto the front of the intake screen (upstream side) to block the intake and stop the water flow.

[0010] However, if the dimensions of a single plywood panel are almost the same as the inner dimensions of the water intake, the left and right edges of the panel will touch the inner wall of the water intake, creating a problem where it cannot be lowered or is difficult to lower.

[0011] Typically, the width of the water intake is greater than the width of the plywood panel, so it is common to lower and install two panels one at a time. In this case, because there is extra space on either side, the panels tend to sway from side to side, making it difficult to lower them vertically. Furthermore, the water pressure pushes the panels against the screen, making them difficult to lower. In addition, after lowering the two panels, they need to be moved laterally to match the width of the water intake, but the panels are under water pressure, and the work is done with ropes, making it difficult to adjust their lateral movement.

[0012] As mentioned above, because it is difficult to lower the plywood panels vertically, gaps tend to form between the bottom and sides of the panels and the water intake wall, which can cause water leaks.

[0013] Therefore, the objective of this invention is to provide a water-stopping panel that is easy to use for stopping water intake at water intakes that do not have a water-stopping device (water-stopping panel), and that can prevent water leakage after installation. [Means for solving the problem]

[0014] To solve the above problems, the invention of claim 1 is characterized in that it comprises a panel formed by joining two plate materials that are offset in the left-right direction and overlapped in the thickness direction, deformable sheet members attached to the left and right side edges of the panel, a weight provided on the front of the panel, and a rope for suspending the panel, wherein when the panel is suspended by the rope and lowered in front of the screen of the water intake, the sheet members come into contact with the left and right side walls of the water intake, thereby closing the water intake.

[0015] The invention of claim 2 is characterized in that, in the water-stopping panel described in claim 1, the two plate materials are connected so as to be expandable and contractible in the left-right direction.

[0016] The invention of claim 3 is characterized in that, in the water-stopping panel according to claim 1 or claim 2, a deformable sheet member is attached to the upper edge of the two plate materials. [Effects of the Invention]

[0017] According to the invention described in claim 1, since the two plates are joined together by shifting them in the left-right direction and overlapping them in the thickness direction, it becomes easy to suspend the two plates simultaneously and lower them in front of the screen of the water intake. Furthermore, the sheet members attached to both the left and right sides of the panel come into contact with the side walls of the water intake, thereby sealing the gap between them and the side walls of the water intake and preventing water leakage.

[0018] According to the invention described in claim 2, since the two plate materials are joined so as to be expandable and contractible in the left - right direction, it is possible to expand and contract the two plate materials after arriving at the site and adjust them to the size of the water intake. This makes it possible to standardize the size of the water - stop panel and pre - manufacture a plurality of water - stop panels, thereby reducing the production cost.

[0019] According to the invention described in claim 3, since a deformable sheet member is attached to the upper edges of the two plate materials, it is possible to prevent the water - stop panel from being overridden even when the water level for water intake rises.

Brief Description of the Drawings

[0020] [Figure 1] Figures 1 to 5 illustrate the water - stop panel according to Embodiment 1, and this figure is a front view. [Figure 2] It is a plan view showing the state where the water - stop panel is installed at the water intake. [Figure 3] It is a perspective view showing a part of the water - stop panel disassembled. [Figure 4] It is a perspective view showing the state immediately before the water - stop panel is installed at the water intake. [Figure 5] It is a perspective view showing the state where the water - stop panel is installed at the water intake. [Figure 6] It is an enlarged perspective view showing a main part of the water - stop panel according to Embodiment 2 of this invention, where (a) shows the state where the length in the horizontal direction is shortened and (b) shows the state where the length in the horizontal direction is lengthened.

Modes for Carrying Out the Invention

[0021] Next, the embodiments of this invention will be described in detail with reference to the drawings.

[0022] (Embodiment 1) Figures 1 to 5 show a water-blocking panel 1 according to this embodiment 1. This water-blocking panel 1 is installed at a water intake 2, which is a facility for taking water from a river or the like into a waterway. Specifically, by dropping the water-blocking panel 1 in front of (upstream of) a screen 3 installed at the water intake 2 to prevent debris from entering the waterway, the water intake 2 is blocked, and water intake to the intake garden, sedimentation basin, etc., at the end of the waterway is stopped. In this embodiment 1, the water-blocking panel 1 is applied to a water intake 2 with a width of 3500 mm.

[0023] The water-stopping panel 1 comprises a panel 5 formed by overlapping two plywood (concrete panels) 4 in the thickness direction while offset from each other, deformable side sheet members 6 attached to the left and right edges of the panel 5, a block 7 attached to the lower front of the panel 5, and a rope 8 for suspending the panel 5.

[0024] As mentioned above, Compane 4 is a type of plywood used as formwork for pouring concrete during house foundation construction. It measures 1800 x 900 x 12 mm and is water-resistant.

[0025] Even if the water outage work in a water intake garden is only for a few days, the plywood panels 4 will be submerged in water, so it is preferable that they have a certain degree of water resistance.

[0026] To join the two plywood panels 4, first, place the panels horizontally so that their side edges overlap by approximately 500 mm in the thickness direction, and then attach vertically elongated retaining plates 9 to both sides of the overlapping portion (see Figure 1). These are attached by bolting them through in the thickness direction of the panels.

[0027] This creates a panel 5 with a width of 3100 mm, which is large enough to fit within the 3500 mm width of the water intake 2.

[0028] Note that in Figure 1, the water-stopping panel 1 is shown before installation at the water intake 2, so the side sheet members 6 on both sides are shown extended in the left-right direction. When the water-stopping panel 1 is actually installed at the water intake 2, the side sheet members 6 will deform upon contact with the side wall of the water intake 2.

[0029] The vertical length of the above-mentioned retaining plate 9 is formed to be about 300 mm longer than the vertical dimension of the plywood panel 4 (900 mm), and reaches the same height as the upper edge of the upper sheet member 10, which will be described later.

[0030] In this embodiment, the retaining plate 9 is provided on the front side of the plywood panel 4, but it may also be placed on the back side. Furthermore, the means of joining the two plywood panels 4 are not limited to this, and the plywood panels 4 may also be directly screwed together.

[0031] Deformable side sheet members 6 are attached to the left and right edges of panel 5 to widen the width of the water-stopping panel 1 to the left and right.

[0032] The side sheet member 6 is rectangular in shape with a width of 600 mm and a length of 1400 mm. It is made of a material that is deformable but self-supporting unless external force is applied. Functionally, if it bends under water pressure, water will leak out, so it is required to be made of a material that can withstand water pressure to some extent and has elasticity. Specifically, in this embodiment, camping mat material: EVA foam (ethylene vinyl acetate) is used. Other materials such as PVC foam (polyvinyl chloride resin) used in yoga mats may also be used.

[0033] To attach the side sheet member 6 to the panel 5, the side edges of the side sheet member 6 are overlapped by approximately 200 mm on the front sides of both the left and right edges of the panel 5, and the retaining plate 11 is attached from the front and secured with screws. This retaining plate 11 is the same size as the retaining plate 9 when two plywood panels 4 are joined together, and therefore the upper end of the retaining plate 11 is 300 mm longer than the upper end of the plywood panels 4.

[0034] As a result, the left and right side sheet members 6 are attached in a sandwiched manner between the retaining plate 11 and the plywood 4, and are installed so as to protrude 400 mm outward from the left and right side edges of the plywood 4. The total width of the water-stopping panel 1, including the left and right side sheet members 6, becomes 3900 mm, which is larger than the width of the water intake 2, which is 3500 mm.

[0035] Furthermore, the upper part of each side sheet member 6 extends approximately 500 mm upward from the upper edge of the plywood panel 4.

[0036] An upper sheet member 10 is attached to the upper edge of panel 5 to increase its height as a water-stopping panel 1.

[0037] The upper sheet member 10 is rectangular in shape with a width of 3100 mm and a height of 500 mm, and is made of the same material as the side sheet member 6 described above. To attach it, the lower edge of the upper sheet member 10 is overlapped by approximately 200 mm on the back side of the upper edge of the panel 5, and the back retaining plate 12 is attached from the back side and secured with screws.

[0038] The horizontal dimension of this rear retaining plate 12 is 3100 mm, and upward-extending arm pieces 12a are formed at both the left and right ends. These arm pieces 12a are positioned opposite the upper part of the retaining plate 11 to which the side sheet member 6 is attached, thereby fixing both the left and right sides of the upper sheet member 10.

[0039] Two blocks 7 are attached to the lower front of the two plywood panels 4, slightly spaced apart on the left and right, so that a total of four blocks 7 are attached to the water-stopping panel 1.

[0040] Block 7 functions as a weight when dropping the water-stopping panel 1 into the water. In other words, because the main material of the water-stopping panel 1 is plywood 4, it is difficult to drop it into the water due to buoyancy, so a certain amount of weight is necessary.

[0041] Block 7 is a type of concrete block used for construction, and like Plywood 4, it is relatively easy to obtain and inexpensive.

[0042] To attach block 7 to the plywood panel 4, two through holes are made in the plywood panel 4 at approximately the same distance as the width of block 7. A wire is passed through these two through holes and the hollow part of block 7, and the wire is secured on the back side of the plywood panel 4. By securing the wire in this way at least in the hollow parts of block 7, a stable attachment to the plywood panel 4 can be achieved.

[0043] A plate piece 13 is provided on the part of the plywood 4 that corresponds to the lower edge of block 7, which allows block 7 to be attached to the plywood 4 with block 7 resting on the plate piece 13, thereby stabilizing the attachment of block 7.

[0044] Furthermore, by installing block 7 in a relatively lower position on the front of the control panel 4, the raising and lowering of the water-stopping panel 1 can be stabilized.

[0045] Of the four blocks 7 of the water-stopping panel 1, the two outermost blocks 7 each have ropes 8 attached to them, and these ropes 8 are used to raise and lower the water-stopping panel 1. Specifically, the ropes 8 are passed through the hollow parts of the blocks 7 and tied together in a loop, and the ropes 8 are attached to the blocks 7. Two workers each grasp one of the two ropes 8 and simultaneously raise or lower the two ropes 8 to raise or lower the water-stopping panel 1.

[0046] Next, we will describe the process of lowering the water-stopping panel 1 according to this embodiment 1 onto the water intake 2 to stop the water flow.

[0047] First, the water-stopping panel 1 is moved above the water intake 2, and two workers each grasp the two ropes 8 and drop them into the water channel in front of the screen 3.

[0048] In this case, when dropping a water-stopping panel 1 with a width of 3900 mm into a water intake opening 2 with a width of 3500 mm, the left and right side sheet members 6 of the water-stopping panel 1 come into contact with the side walls of the water intake opening 2. However, by dropping the water-stopping panel 1 while tilting it so that the lower part is in front of the upper part, the left and right side sheet members 6 will bend or fold forward, allowing the water-stopping panel 1 to be moved downward. To tilt the water-stopping panel 1, for example, one can control its position with another rod-shaped device, or one can control its position when the water-stopping panel 1 is positioned above the water intake opening 2, so that the side sheet members 6 are curved or folded in advance.

[0049] Next, the water-stopping panel 1 is suspended using two ropes 8, and the water-stopping panel 1 is moved downwards by pulling down the ropes 8.

[0050] When the water-blocking panel 1 is moved downward, the water pressure pushes it towards the screen 3, and by further lowering the water-blocking panel 1 to the bottom of the waterway, the water intake 2 can be blocked. At this time, the side sheet members 6 spread out to the left and right due to the water pressure, and are pressed appropriately against the side walls of the water intake 2, thus closing the gap between them and the side walls. In this case, the water level at the water intake 2 is assumed to be around 1000 mm, but if the water level is expected to be higher than this, the vertical dimension of the upper sheet member 10 will need to be increased.

[0051] As described above, in the water-stopping panel 1 according to this embodiment 1, two plywood panels 4 are joined together to form one water-stopping panel. Conventionally, it was necessary to drop in each of the two plywood panels, meaning two separate operations were required. However, with this embodiment, the water intake 2 can be closed with just one dropping operation, thus improving work efficiency. Of course, the water-stopping panel 1 can also be removed with a single lifting operation, thus shortening the work time.

[0052] Furthermore, the left and right side edges of the water-stopping panel 1 are made of a deformable sheet material that can withstand a certain amount of water pressure and has elasticity. Therefore, when the water-stopping panel is dropped into the water intake, it is subjected to water pressure and deforms appropriately, conforming to the shape of the side wall and making contact with it. This seals the gap between the panel and the side wall of the water intake, preventing water leakage.

[0053] (Embodiment 2) Figure 6 shows Embodiment 2 of the present invention. Embodiment 2 differs from Embodiment 1 in that the two plywood panels 4 are movable relative to each other in the left-right direction, and the lateral length of the water-stopping panel 1A is made expandable and contractible. The other parts are the same as those in Embodiment 1, so the same reference numerals as in Embodiment 1 are used for the parts that are similar, and their descriptions are omitted.

[0054] Figure 6 is an enlarged perspective view of the main part, where Figure 6(a) shows the water-stopping panel 1A with a shortened lateral length, and Figure 6(b) shows the water-stopping panel 1A with a lengthened lateral length.

[0055] In the overlapping portions of the two plywood panels 4 that make up the water-stopping panel 1A, elongated holes 15 are formed in four locations (top, bottom, left, and right) through which bolts 14 pass. These elongated holes 15 are formed so that the upper holes 15 are aligned with the upper holes, and the lower holes 15 are aligned with the lower holes.

[0056] Furthermore, the vertical position of each elongated hole 15 is formed to be the same as the bolt holes used when bolting the two plywood panels 4 together with the retaining plate 9, and the same bolts 14 used for this bolt fastening are utilized.

[0057] This allows the two plywood panels 4 to be slid left and right with the bolts 14 loosened, and then bolted at the appropriate positions to create a water-stopping panel 1A that corresponds to the width of the water intake 2.

[0058] The state shown in Figure 6(a) is that the four elongated holes 15 formed in one plywood panel 4 and the four elongated holes 15 formed in the other plywood panel 4 are facing each other and joined together with four bolts 14.

[0059] Since two plywood panels 4 and two retaining plates 9 are bolted together with four bolts 14, four joints are created, making it possible to create a strong and stable waterproof panel 1A.

[0060] Furthermore, even in this state (with four connections), because the through holes through which the bolts 14 are inserted are elongated, the two plywood panels 4 can be moved laterally relative to each other within a range approximately twice that of the elongated holes 15, thereby allowing the lateral length of the water-stopping panel 1A to be adjusted.

[0061] The state shown in Figure 6(b) is where the elongated holes 15 at the end of one plywood panel 4 and the elongated holes 15 at the end of the other plywood panel 4 are facing each other and joined together with two bolts 14, one above and one below.

[0062] Since two bolts 14 are used to fasten the two plywood panels 4 and one retaining plate 9 together, two joints are created, and the bonding strength is slightly weaker compared to (a). However, because the elongated holes 15 at the ends of the plywood panels 4 are used, the lateral length of the joined water-stopping panel 1A can be increased.

[0063] Furthermore, even in this state (with two connections at the top and bottom), similar to state (a), the two plywood panels 4 can be moved laterally relative to each other within a range approximately twice the size of the elongated hole 15, allowing the lateral length of the water-stopping panel 1A to be adjusted.

[0064] As described above, in the water-stopping panel 1A according to this second embodiment, two plywood panels 4 are joined together in a retractable manner, so the water-stopping panel 1A can be made to the appropriate length after checking the size of the water intake 2 on site, and can accommodate water intake 2 of various sizes.

[0065] In other words, this eliminates the need to create a separate water-stopping panel 1A for each water intake 2 of different sizes, making it possible to mass-produce them to some extent and contributing to cost reduction.

[0066] Although not shown in the diagram, in order to connect the two plywood panels 4 in an expandable and retractable manner, the upper sheet member and the back retaining plate 12 for attaching them to the plywood panels 4 must also be movable on each panel 4. Therefore, it is necessary to provide the upper sheet member 10 and the back retaining plate 12 separately on each panel 4, and to form elongated holes similar to the elongated holes 15.

[0067] Although embodiments 1 and 2 of this invention have been described above, the specific configuration is not limited to embodiments 1 and 2 described above, and any design changes, etc., that do not depart from the gist of this invention are also included. For example, although a case in which plywood 4 is used as the board material for the water-stopping panel 1 has been described, the present invention is not limited to this, and any panel-shaped material that can withstand water pressure and does not leak water in the thickness direction is acceptable. Plywood 4 was used because, as mentioned above, it is highly water-resistant and relatively easy to obtain.

[0068] Furthermore, although a so-called concrete block for construction was used as a weight in Embodiment 1, the present invention is not limited to this, and a weight made of iron or other material may also be used. The point is that the weight of the water-stopping panel 1 should be such that buoyancy does not make it difficult to lower the water-stopping panel 1 into the water in the water intake 2.

[0069] Furthermore, in the above embodiment, the upper sheet member was fixed to the panel 5, but it is not limited to this. If it is attached so as to be movable vertically relative to the panel 5, the height of the water-stopping panel 1 can be raised in place if the water level exceeds the expected level. [Explanation of symbols]

[0070] 1. Water-stopping panel 2. Water intake 3 screens 4. Plywood (board material) 5 panels 6. Side sheet member 7 blocks (weights) 8 ropes 10 Upper sheet member

Claims

1. The device comprises a panel formed by joining two boards that are offset from each other in the left-right direction and overlapped in the thickness direction, deformable sheet members attached to the left and right edges of the panel, a weight provided on the front of the panel, and a rope for suspending the panel. The panel is suspended by the rope and lowered in front of the screen of the water intake, so that the sheet member contacts the left and right side walls of the water intake, thereby blocking the water intake. A water-stopping panel characterized by the following features.

2. The two aforementioned plates are joined together so that they can be extended and retracted in the left-right direction. The water-stopping panel according to feature 1.

3. A deformable sheet member is attached to the upper edge of the two aforementioned plate materials. A water-stopping panel according to claim 1 or 2.

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