JP2010185183A - Simplified check gate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simplified check gate which is arranged in an existing or newly-constructed water channel, which can make manufacturing costs low in a simple constitution, and which can also reduce maintenance costs. <P>SOLUTION: This check gate 10 includes a rotating shaft 12 horizontally arranged in the water channel 1, and a rotatable gate body 11 supported by the rotating shaft 12. The gate body 11 includes a first arm 111 extending to the side of the bottom 1a of the water channel, and a second arm 112 extending to the side of the surface 1b of the water channel, when the gate body 11 is in a first position P1. The length of the first arm 111 is set to be approximately half the length of the second arm 112, so that water pressure PL imposed on the first arm 111 and water pressure PU imposed on the second arm 112 are made approximately the same in the state in which the gate body 11 is tilted in an approximately perpendicular direction. When the gate body 11 is in the first position, a gap S is formed between the leading end of the first arm 111 and the bottom 1a of the water channel. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a simple check gate that is arranged in a water channel to dam up the water flow or to release the water flow.

  Agricultural irrigation facilities that have been constructed in the past have been aged over the years of their useful lives, and are being refurbished due to changes in the surrounding environment. However, there are some areas where problems such as partial diversion and improvement of channel roughness have caused the water level in the channel to drop and the previous diversion function not being achieved. Various check gates have been developed so far to maintain the diversion level of the waterway. However, these check gates, whether ascending / descending gates or rotating gates, have gate pillars, door stops or watertight plates, etc., and their scale is large and complicated. There were many factors that increased the costs required for painting, etc., and increased the management costs of beneficiaries, which was putting pressure on agricultural management. Therefore, there has been a demand for a check gate having a simple configuration that is inexpensive and easy to maintain.

  The rotary gate shown in Patent Document 1 was invented to solve these problems, and the rotary gate includes a door body that can rotate on a rotary shaft that is arranged in the vertical direction. The door body is rotated around the rotation axis, and when the water body is at a position orthogonal to the water flow, the water flow is lifted up, and the water flow is released by rotating from the orthogonal position, and flows downstream. Become. As a result, it was provided as an inexpensive gate with the gate pillar removed.

  Further, the rotary gate 20 shown in FIG. 6 is arranged so as to connect a rotary shaft 23 via a gate main body 21 and a gate support arm 22, and the gate main body 21 rotating around the rotary shaft 23 is It is configured to rotate in the vertical direction with respect to the water flow. The gate main body 21 is formed to have a semicircular portion 211 at a lower portion and a flat blade portion 212 disposed at an upper portion of the semicircular portion 211. A rubber member 29 is attached to the side surfaces of the semicircular portion 211 and the blade portion 212 in order to maintain a watertight state with the door stop plate 28 embedded in the water channel side wall 27.

  In addition, when the gate main body 21 is damming up the water flow, that is, when the blades 212 are positioned in the vertical direction, the lower part of the semicircular portion 211 contacts the sill metal 25 arranged at the bottom of the water channel. Touching. An elastic watertight member 26 capable of coming into contact with the threshold metal fitting 25 is attached to the lower end portion of the semicircular portion 211. That is, the gate main body 21 is in a watertight state with the bottom of the water channel so that a water flow does not flow from the bottom of the water channel. When the water level becomes high, the water pressure acting on the blade portion 212 increases, and the gate body 21 is opened with the blade portion 212 in the horizontal direction by automatically rotating around the rotation shaft 23 without a stable balance. become. This rotating gate 20 also has an effect that the gate pillar is eliminated and the landscape is improved, and the structure can be configured inexpensively with a simple structure.

JP 2001-159125 A

  However, it is necessary to set the position of the check gate so that when the amount of water is low, the water is raised by raising the water when the amount of water is small, and when the amount of water is large, the check gate is placed in the water channel to secure the water level. is there. At this time, in a fast flowing water channel, it is desirable that the left and right flow conditions be uniform because of the increased undulation caused by drift.

  In the type of Patent Document 1 in which the door body is rotated in the horizontal direction with respect to the rotation shaft, the check gate position at the intermediate opening is placed obliquely in the flowing water, so that a drift occurs in the left and right flows. Become. The drift caused by the check gate increases the ripples downstream. In addition, this rotary gate has a cantilever structure with a long arm in a water channel that is wider than the water depth. It was. Further, since this rotary gate has a watertight structure with respect to the bottom of the water channel and the side wall of the water channel, the structure is complicated and expensive. Furthermore, since this rotary gate has water tightness with respect to the bottom of the water channel, earth and sand accumulated at the bottom of the water channel accumulates, increasing the amount of soil removal management work upstream.

  Further, in the rotary gate 20 shown in FIG. 6, the door stop plate 28 is embedded in order to maintain the water tightness between the rotary gate 20 and the water channel side wall 27, so that the door stop plate 28 is embedded in the water channel side wall 27. It is necessary to construct a big construction to do. For this reason, construction costs were to be significantly increased. Furthermore, since the elastic water-tight member 26 of the gate body 21 contacts the sill metal 25, the elastic water-tight member 26 and the sill metal 25 must also be installed, which further increases the cost for manufacturing the gate, which also increases the cost. It was connected. In addition, the sediment management work had to be increased due to the accumulation of earth and sand.

  An object of the present invention is to provide a simple check gate that solves the above-described problems and that can be configured with a simple configuration at low cost and that does not accumulate sediment or the like in the vicinity of the gate.

For this purpose, the simple check gate according to the present invention is configured as follows. That is,
The invention according to claim 1 is a simple check gate disposed in the water channel and configured to be rotatable with respect to the water flow, and is disposed along the width direction of the water channel with respect to the water channel. A rotary shaft, and a gate body supported by the rotary shaft, wherein the gate body is erected in a direction perpendicular to the water flow to dam up the water flow, and Tilted in a direction parallel to the water flow and rotatably disposed at a second position for flowing the water flow from the upstream side to the downstream side. The position of the rotary shaft is the center position of the gate body so that the rotational moment on the water channel bottom side of the gate body that takes a high pressure and the rotational moment on the water channel surface side of the gate body that takes a low water pressure become substantially the same. Is arranged closer to the bottom of the water channel It is characterized in that there.

  The invention according to claim 2 relates to the invention according to claim 1, wherein when the gate main body is in the first position, a gap is formed between a lower end portion of the gate main body and the bottom of the water channel. It is characterized by having arranged.

  A third aspect of the present invention relates to the first or second aspect of the present invention, wherein the gate main body extends from the rotary shaft when in the first position toward the bottom of the water channel. A first arm portion and a second arm portion extending in a direction opposite to the first arm portion, wherein the first arm portion is approximately half as long as the second arm portion. It is characterized by being formed.

  The invention according to claim 4 relates to the invention according to claim 1, 2 or 3, characterized in that the gate body is arranged with a gap between the side wall of the water channel. Yes.

  Invention of Claim 5 concerns on invention of Claim 1, 2, 3 or 4, Comprising: The said gate main body is either one surface of the surface which receives the water pressure of the said water flow, or the surface on the opposite side Is formed in a planar shape, and one of the other surfaces is formed into a projecting curved surface.

  According to invention of Claim 1, the gate main body is arrange | positioned so that rotation with respect to the rotating shaft arrange | positioned at a horizontal direction is possible. Further, the gate main body rotates between a first position where the gate body is erected to raise the water flow and a second position where the water flow is caused to rotate in the horizontal direction. When the gate body is in the first position, the water pressure applied to each part of the gate body varies depending on the depth of the water flow. By arranging the rotating shaft on the water channel bottom side where the water pressure is higher than the center of the gate body, the rotational moment of the gate body rotating around the rotating shaft is balanced. That is, when the gate main body is in the first position, the portion on the water channel bottom side below the rotation axis of the gate main body has a high water pressure per unit area. Since the water pressure per unit area is small in the part on the water channel surface side above the rotation axis, the area receiving the water pressure is increased. Thus, the difference between the rotational moment rotating along the water flow on the water channel bottom side below the rotation axis in the gate body and the rotation moment rotating along the water flow on the water channel surface side above the rotation axis in the gate body. Can be made substantially the same, and the balance of the rotational moment of rotation of the gate body can be improved. Accordingly, since the torque for rotating the gate body can be reduced when the gate body rotates, the gate body can be rotated by a small force such as human power. Therefore, a simple check gate can be manufactured at a low cost without providing an expensive drive mechanism.

  According to the invention described in claim 2, when the gate main body is in the first position where the water flow is raised, the gap is formed between the lower end of the gate main body and the bottom of the water channel. That is, in a state where the water flow is dammed up, earth and sand flow from the upstream side to the downstream side below the gate body, so that the earth and sand do not accumulate before the simple check gate. Therefore, it is possible to reduce the burden on the beneficiary by reducing the maintenance cost without increasing the soil removal management on the upstream side. Further, in the state where the gate body is in the first position where the water flow is dammed up, the elastic watertight member attached to the conventional sill bracket 25, the door stop plate 28, or the semicircular portion 211 that is installed to maintain watertightness. 26 and the rubber member 29 are not installed, the manufacturing cost and installation work are easy and a simple check gate can be manufactured at a low cost.

  According to the invention described in claim 3, the gate main body has a first arm portion extending from the rotating shaft toward the water channel bottom side when the gate main body is at the first position where the water flow is raised. And a second arm portion extending in a direction opposite to the first arm portion. And the 1st arm part is formed in the length of about half of the length of the 2nd arm part. As a result, in a state where the water flow is dammed up, a high water pressure is applied to the first arm portion having a short length, and a low water pressure is applied to the second arm portion having a long length. The balance of the receiving part is improved. Thereby, the rotational moment in which the first arm portion rotates along the water flow and the rotational moment in which the second arm portion rotates along the water flow are substantially the same. By improving the balance of the rotational moment, the rotational force at the time of opening and closing the gate body can be reduced. For example, it can be easily performed even if the rotation shaft is rotated manually.

  According to the invention of claim 4, since this simple check gate is for damming up the upstream water flow, the gate body does not require watertightness with the side wall of the water channel. Therefore, a gap is provided between the gate body and the water channel side wall. Therefore, when installing a check gate in an existing water channel, it is not necessary to embed a door stop for maintaining water tightness in the side wall of the water channel when opening and closing the gate body. Therefore, the construction cost for arranging the simple check gate can be greatly reduced.

  According to the invention of claim 5, the gate main body is formed such that one of the surface receiving the water pressure of the water flow or the surface on the opposite side is planar, and the other surface is formed as a projecting curved surface. By doing so, it is possible to obtain a lift force that is directed in the direction in which the gate main body is projectingly curved. As a result, the curved surface that protrudes depending on the situation, such as when the gate body is made of resin material, wood, etc., and its weight is light, or when it is made of steel, etc., and its weight is heavy By changing the position, it is possible to adjust the balance of the rotational moment about the rotation axis to suppress the swinging of the gate body, and to adjust the operating power of the opening / closing device to a small level.

It is a whole block diagram which shows the check gate of this invention. It is side surface sectional drawing which shows the gate main body of the check gate in FIG. FIG. 3 is a partial front sectional view showing details of a rotation shaft in FIG. 2. It is a side view which shows the protrusion end of the rotating shaft in FIG. FIG. 2 is an operation diagram showing a state in which the check gate of FIG. 1 is operating normally. It is a block diagram which shows the conventional rotation gate.

  Next, an embodiment of a simple check gate of the present invention will be described based on the drawings.

  FIG. 1 shows a state in which a simple check gate (hereinafter simply referred to as a check gate) 10 is installed in a water channel 1, and the water channel 1 extends from an upstream side (left side in FIG. 1) 3 to a downstream side (FIG. 1). (Right side in 1) Water is flowing toward 5. The check gate 10 is installed in the water channel 1. The check gate 10 is installed between the water channel bottom 1a and the water channel surface 1b in order to raise the water level on the upstream side 3, and at the first position P1 erected at a rotation angle Θ with respect to the water flow. And the second position P2 rotated in the horizontal direction parallel to the water flow in order to flow the water level on the upstream side 3 to the downstream side 5 without raising the weir, depending on the flow rate of the water channel or the weir Rotate and move according to the required water level height. This movement operation is performed by human power in the switch 9 connected to the check gate 10 and disposed on the water channel side wall 1c. Of course, a drive mechanism can be provided to drive electrically. In addition, in the upstream 3 of the check gate 10, the water diversion work 7 for diverting water to a beneficiary place is arrange | positioned at the waterway side wall 1c.

  As shown in FIG. 2, the check gate 10 includes a gate body 11 and a rotating shaft 12. The gate body 11 is formed with two arm portions extending from the rotary shaft 12 to both sides. One arm portion is a first arm portion 111 facing the water channel bottom 1a side in a state where the gate main body 11 is at the first position P1, as shown in FIG. 1, and the other arm portion is a water channel. It is formed as a second arm portion 112 toward the surface 1b side. The gate body 11 is formed in a hollow shape together with the first arm portion 111 and the second arm portion 112, and the periphery thereof is formed of a steel plate, a resin plate, a wooden plate, or the like. As shown in FIG. 3, protruding ends 13 are formed at both ends in the width direction of the gate body 11.

  In the embodiment, as shown in FIG. 3, the rotating shaft 12 extends from the end in the width direction of the gate body 11 in the first arm portion 111 to the end in the width direction of the gate body 11 in the second arm portion 112. The projecting ends 13 on both sides are supported by the water channel side wall 1c. That is, the non-shrink mortar 14 is embedded in the water channel side wall 1c so as to support the check gate 10, the shaft fixing plate 15 is fixed with the anchor bolt 17 therein, and the fixed shaft portion 16 protrudes from the shaft fixing plate 15. It is arranged.

  On the other hand, as shown in FIG. 4, a slit 131 is formed on one side of the projecting end 13 of the rotating shaft 12 disposed so as to project from both ends of the gate body 11. The slit 131 is formed so as to face downward when the gate body 11 moves to the second position. With the slit 131 facing downward, the slit 131 of the protruding end 13 is inserted into the fixed shaft portion 16 while being inserted, The fixed shaft portion 16 and the protruding end 13 are configured to be fitable.

  Since the first arm portion 111 is disposed on the lower side of the water flow and receives a high water pressure, the first arm portion 111 is formed shorter than the second arm portion 112. That is, the rotating shaft 12 is disposed at a position lower than the center position of the gate body 11 in a state where the gate body 11 is at the first position P1 that stands upright in a direction perpendicular to the water flow. The length ratio of the first arm part 111 and the second arm part 112 is such that the first arm part 111 is substantially half the length of the second arm part 112. Therefore, the rotating shaft 12 is disposed at a position 2/3 from the upper position of the gate body 11 in a state where the gate body 11 is at the first position P1. As a result, the water pressure PL applied to the first arm portion 111 and the water pressure PU applied to the second arm portion 112 are substantially the same, and the water pressure applied to the gate body 11 is balanced.

  The gate body 11 according to the embodiment is formed of a light material, and forms the upstream side surface 11a of the water channel 1 in a flat shape when placed upright on the water channel 1, and the downstream side surface 11b projects to the downstream side 5. It is formed in a curved shape. The portion of the gate body 11 (the first arm portion 111 and the second arm portion 112) formed in a planar shape is formed of a plate member having high strength, and the portion formed in a curved shape is a planar shape. A plate member having a lower strength than that of the portion is curved to form a current plate that facilitates the flow of water. In the first arm portion 111 and the second arm portion, as shown in FIG. 3, in the width direction of the gate body 11 so as to fill the space portions of the first arm portion 111 and the second arm portion 112. Plate portions 111a (112a) are formed at intervals along a plurality of locations. The front end surfaces in the length direction of the first arm portion 111 and the second arm portion 112 are formed in an arc shape to facilitate the flow of water. 3 shows a cross section when it is at the second position P2, and the first arm portion 111 or the second arm portion 112 shown by a two-dot chain line is the gate body 11. The position at the first position P1 is shown.

  The gate main body 11 receives the water pressure PL on the first arm portion 111 to facilitate the counterclockwise rotation of the gate main body 11 in FIG. 1 and receives the water pressure PU on the second arm portion 112. In FIG. 1, the gate body 11 is easily rotated clockwise. When the water pressure PL applied to the first arm portion 111 and the water pressure PU applied to the second arm portion 112 are substantially the same, when the gate body 11 is rotated to any one by performing the operation by the switch 9 by human power. Can be operated with a small torque.

  Further, when the downstream side surface 11b of the gate body 11 is formed in a curved shape, water is rectified, and particularly when the weight of the gate body 11 is reduced, that is, when the gate body 11 is formed of a resin material or wood, When in the second position P2, the downstream end of the gate main body 11 is fixed at a substantially constant angle so that the lift acting on the gate main body 11 overcomes the buoyancy of the gate main body 11, thereby reducing the swing of the gate main body 11. ing.

  On the contrary, when the gate body 11 is in the second position P2, when the upper surface forms a curved surface, the downstream end of the gate body 11 is lifted by lift and buoyancy. It has been confirmed by experiments that the rotation and swing of 11 becomes intense. In this case, it is desirable that the gate main body 11 including a steel gate formed of a steel plate is kept horizontal by a hoisting machine that balances the resultant force of lift and buoyancy.

  Further, when the gate body 11 is heavy, that is, in the case of the gate body 11 made of a steel plate, when the gate body 11 is at the second position P2, the curved surface with the upper surface of the gate body 11 protruding upward is provided. Form. That is, when the gate main body 11 is in the second position P2, the second arm 112 is formed longer than the first arm portion 111. Therefore, the rotating shaft 12 is moved by the dead weight of the second arm portion 112. Increase the moment of turning clockwise in the center. On the other hand, a lift force acting on the second arm portion 1 works on the gate body 11, and a moment rotating counterclockwise acts on the gate body 11. Therefore, in the gate body 11, the large clockwise moment is reduced by the counterclockwise moment, and the total moment combined with the moment due to the water pressure is reduced to reduce the opening / closing rotational force of the switch 9. Can do.

  When installing the check gate 10 in the water channel 1, the protruding end 13 formed on the gate body 11 is fitted to the fixed shaft portion 16 disposed on the water channel side wall 1 c so as to be rotatably attached to the water channel side wall 1 c. The gate body 11 is installed at an angle of rotation Θ with respect to the direction of the water flow. The maximum rotation angle Θ is set to about 80 °. The rotation of the rotary shaft 12 may be provided with a drive mechanism, but in order to reduce the equipment cost, a lever (not shown) arranged on the switch 9 connected to the protruding end 13 of the check gate 10 is manually operated. .

  Moreover, it arrange | positions with the clearance gap S between the 1st arm part 111 of the gate main body 11, and the waterway bottom part 1a surface. The gap S is such that earth and sand flow, and prevents the earth and sand from accumulating near the upstream side 3 of the check gate 10.

  Next, the operation of the check gate 10 will be described.

  As shown in FIG. 1, when the gate body 11 is in the first position P1, it is set around a rotation angle of about 80 ° with respect to the direction in which the water channel 1 flows by rotating around the rotation shaft 12. Has been. When the maximum flow rate flows down the water channel 1, the water can be divided from the water divider 7 even if the rotation angle Θ is set to zero. When the flow rate of the water channel 1 decreases and the water level falls, water separation becomes impossible. At this time, on the upstream side 3 of the check gate 10, the raised water is stored and the water level is gradually increased. That is, when the flow rate is very small compared to the maximum flow rate, the rotation angle of the gate body 11 is set up to approximately 80 °. The water level is maintained higher than the second arm portion 112 of the gate body 11 inclined by about 80 °, and the water on the upstream side 3 passes over the second arm portion 112 and passes through the second arm portion 112 as shown in FIG. From the upper side of the arm portion 112 to the downstream side 5. This state is a normal state as the check gate 10. In such a state, the suspended matter floating on the surface of the upstream side 3 flows to the downstream side 5 together with water. The water stored on the upstream side 3 of the check gate 10 is supplied from the water divider 7 to, for example, individual rice fields.

  A water pressure PL is applied to the first arm portion 111 and a water pressure PU is applied to the second arm portion 112 due to the water flow on the upstream side 3.

  When the flow rate is an intermediate flow rate higher than the minimum flow rate, the rotary shaft 12 is rotated in accordance with the flow rate, and the gate body 11 is set within a range of a rotation angle of approximately 80 ° to a rotation angle of 0 ° (second position P2). Then, the rotary shaft 12 is rotated and fixed. The rotation of the rotating shaft 12 may be performed manually or may be operated via a drive mechanism. Rotation operation of the rotating shaft 12 is rotated by more than the force that opposes the water pressure PL applied to the first arm portion 111 while being pressed by the water pressure PU applied to the second arm portion 112 among the water pressure applied to the gate body 11. Therefore, even if it is operated manually, it can be easily performed.

  Until the gate body 11 is released from the first position P1 and reaches the second position P2, the water from the upstream side 3 gradually flows toward the downstream side 5, and the gate body 11 is moved to the second position P2. When P2 is reached, the weir state is canceled and flows toward the downstream side 5. When damming is required again, the gate body 11 is rotated counterclockwise in FIG. 5 and stopped at a rotation angle position corresponding to the flow rate.

  As described above, according to the check gate 10 of the embodiment, the rotational shaft 12 is disposed at a position where the water pressure applied to the gate body 11 is balanced, and thus the rotational torque required for the rotation operation of the gate body 11. Therefore, even if the rotating shaft 12 is rotated manually, it can be easily performed.

  In addition, the gate body 11 is intended to allow the water flow on the upstream side 3 to be dammed up, and does not require water tightness. Without installing an elastic watertight member, the rotation angle with respect to the water flow can be stopped at a required position in a range of approximately 80 ° to a rotation angle of 0 °. Therefore, conventionally, a door stop plate embedded in the entire water channel side wall 1c around the position where the rotary gate is installed, a sill bracket placed on the water channel bottom 1a, an elastic watertight member arranged on the rotary gate, or the like is installed. The cost can be eliminated and the check gate 10 can be manufactured at a low cost.

  Furthermore, since there is a gap S between the distal end portion of the first arm portion 111 and the water channel bottom 1a at a position (first position P1) at a rotation angle of 80 ° with respect to the water flow of the gate body 11, the water channel Sediment and the like that have flowed to the bottom 1 a will flow down to the downstream side 5 through the check gate 10. In addition, the suspended floating material flows down over the check gate 10. Therefore, earth and sand, dust, etc. do not stay near the upstream side 3 of the check gate 10. Therefore, since there is no increase in dust removal and soil removal management in the vicinity of the upstream side 3, maintenance costs can be reduced, and the burden on the beneficiary is reduced.

  Furthermore, the water raised on the upstream side 3 flows down from both the lower side of the first arm portion 111 and the upper side of the second arm portion 112, thereby reducing the noise caused by falling water or jumping water. Can do.

  The check gate 10 of the present invention is not limited to the above-described form. For example, as long as the first arm unit 111 is shorter than the second arm unit 112, the first arm unit 111 may not be approximately half the length of the second arm unit 112.

  Moreover, you may form the fixed shaft part 16 and the protrusion end 13 in reverse. That is, the fixed shaft portion 16 is formed of a square steel plate, a slit is formed in the fixed shaft portion 16, and the protruding end 13 of the rotating shaft 12 is formed in a columnar shape or a cylindrical shape and can be inserted into the slit of the fixed shaft portion 16. As an alternative, the rotary shaft 12 may be configured to be rotatable.

  Further, when the gate main body 11 is at the first position P1, the upstream side surface 11a of the gate main body 11 may be formed in a curved shape, and the downstream side surface 11b may be formed in a flat shape.

  Furthermore, one end of a wire or rope or connecting rod is attached to the tip of the second arm portion 112, and the other end is connected to, for example, a hoisting machine, and the gate body 11 is in the horizontal second position P2. Sometimes, the swinging of the gate body 11 may be prevented.

  Further, the first position of the gate body 11 may be set to a vertical state by setting, for example, 90 ° instead of setting the rotation angle Θ relative to the water flow to 80 °.

DESCRIPTION OF SYMBOLS 1, Water channel 1a, Water channel bottom part 10, Check gate 11, Gate main body 111, 1st arm part 112, 2nd arm part 12, Rotating shaft 13, Projection end 16, Fixed shaft part P1, 1st position P2, Second position PL, water pressure PU, water pressure S, gap

Claims (5)

It is a simple check gate that is arranged in a water channel and is formed to be rotatable with respect to the water flow,
A rotating shaft disposed along the width direction of the water channel with respect to the water channel, and a gate body supported by the rotating shaft,
The gate body is erected in a direction perpendicular to the water flow to dam the water flow, and tilts in a direction parallel to the water flow to move the water flow from the upstream side to the downstream side. And a second position flowing through the
In the first position, the rotation moment on the water channel bottom side of the gate body where the water pressure is high and the rotation moment on the water channel surface side of the gate body where the water pressure is low are substantially the same around the rotation axis. Thus, the position of the said rotating shaft is arrange | positioned near the said water channel bottom part side from the center position of the said gate main body, The simple check gate characterized by the above-mentioned.   The simplified structure according to claim 1, wherein when the gate body is in the first position, a gap is provided between a lower end portion of the gate body and the bottom of the water channel. Check gate.   The gate body extends in a direction opposite to the first arm portion and a first arm portion extending toward the water channel bottom from the rotating shaft when in the first position. 3. The simple check gate according to claim 1, further comprising a second arm portion, wherein the first arm portion is formed to be approximately half as long as the second arm portion.   4. The simple check gate according to claim 1, wherein the gate main body is disposed with a gap between the gate main body and the water channel side wall.   The gate body is characterized in that either one of the surface receiving the water pressure of the water flow or the surface on the opposite side thereof is formed in a flat shape, and the other surface is formed in a projecting curved surface. The simple check gate according to claim 1, 2, 3, or 4.

Images