JP2019027217A - Multi-point support type flap gate - Google Patents

Abstract

To provide a multi-point support type flap gate that can be installed in a large sluice gate while maintaining a function as a flap gate.SOLUTION: Door body support means 2 is constituted of at least three or more door body support units 21. Each of the door body support units 21 includes a door body support pivot 22 supporting a large door body 3. Each of the door body support pivots 22 are disposed on the coaxial line. Also, both ends of each of the door body support pivots 22 are fixed by a bearing bracket 23. The large door body 3 has a door main body 31 that can close an opening 11 of a large sluice gate 10, a plurality of door body boss parts 33, each of which is axially supported rotatably on each of the door body support pivots 22 via a sliding bearing or a rolling bearing, and a plurality of support arms 34, each of which is fixed to each of the door body boss parts 33 and that supports the door main body 31. The large door body 3 is supported with multiple points by the plurality of door body support units 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a multi-point support type flap gate installed in a large sluice.

  The sluice and lock gates are provided with openings for rivers, lakes, coasts, etc. for drainage. The opening is provided with a gate to prevent backflow caused by a tsunami or storm surge. Conventionally, many gates are manually opened and closed by an administrator, and there is a problem that management costs such as labor costs are high. In addition, there is a problem that there is a risk of being caught in a tsunami or storm surge on the way to the site or during opening and closing work.

  Therefore, in order to solve such problems, gates have been proposed that automatically open and close according to fluctuations in the water flow. For example, Japanese Patent Application Laid-Open No. 2012-57322 discloses a flap gate including a door body that swings due to a difference in internal and external water pressure at an opening portion of a confluence point between an inner water side and an outer water side, A rotating shaft provided; a swing arm provided at a lower portion of the rotary shaft; the door attached to the swing arm at a predetermined angle with respect to the swing arm; Provided on the opposite side of the door body across the rotating shaft, a balance weight for adjusting the swing of the door body, an adjusting arm provided on the outside water side of the rotating shaft, and movable to the adjusting arm An adjustment weight for adjusting the rotational moment of the door body, and a flap gate provided at a lower inner side of the door body and having a float with a buoyancy inside the center of gravity of the door body are disclosed. (Patent Document 1).

JP 2012-57322 A

  By the way, in recent years, needs for large sluice gates are increasing to cope with flood damage such as tsunami. However, most of the conventional flap gates including the invention described in Patent Document 1 are used for small sluice gates and cannot be used as they are for large sluice gates. For example, the rotating shaft is composed of a single long cylindrical member, and both ends thereof are supported by bearings. Therefore, when a large door is supported, there is a problem that the rotating shaft is bent due to its weight. One possible solution is to increase the shaft diameter in order to increase the strength of the rotating shaft. In this case, however, the rotating shaft itself becomes heavier, which in turn requires bearing reinforcement and increases manufacturing costs. To do.

  The present invention has been made to solve the above problems, and provides a multi-point support type flap gate that can be installed in a large sluice while maintaining the function as a flap gate. It is an object.

  In order to solve the problem that the multipoint support type flap gate according to the present invention is installed on a large sluice while maintaining the function as a flap gate, a door body support means provided above the large sluice, and this door A large-sized flap gate having a large-sized door that is swingable on the body support means and supported by a weight balance that closes the opening of the large-sized sluice, and a hydraulic opening / closing means that opens and closes the large-sized door body. The door body support means is composed of at least three or more door body support units, and each of these door body support units includes a door body support shaft for supporting the large door body, Door body support shafts are arranged coaxially with each other, both ends of each door body support shaft are fixed by bearing brackets, and the large door body can close the opening of the large sluice gate. A body, a plurality of door body bosses pivotally supported on each of the door body support shafts via sliding bearings or rolling bearings, and fixed to the door body boss parts. A plurality of support arms that support the door body, and the large door is supported at multiple points by the plurality of door body support units.

  Further, as one aspect of the present invention, the weight arm that supports the balance weight has a function as a torque arm for generating torque for swinging the large door body by the hydraulic cylinder, and the large door body is closed. In order to solve the problem of preventing the buckling load applied to the hydraulic cylinder from being applied, a weight arm supporting a balance weight is fixed to the door body boss portion, and the hydraulic opening and closing means is A hydraulic cylinder installed at a base end thereof so as to be swingable above the large sluice, and a weight arm, and is engaged with a tip end portion of a piston rod of the hydraulic cylinder to transmit hydraulic power to the weight. An engagement stopper that transmits to the arm, and the engagement stopper is configured to be the large door body. The only engages the piston rod when swinging in the opening direction by the hydraulic cylinder, it may be provided detachably to the pivoting movement of the closing direction.

  Furthermore, as one aspect of the present invention, in order to solve the problem of preventing the weight of the hydraulic cylinder from being applied to the door support shaft when the large door swings in the opening direction due to the water pressure from the upstream side, A guide roller is attached to the tip of the rod, and a guide member for guiding the guide roller along an arcuate locus along which the engagement stopper moves when the large door opens and closes, the large sluice gate May be disposed at a position other than the door support shaft.

  Further, as one aspect of the present invention, in order to solve the problem of preventing a torsional stress from being applied to the piston rod of the hydraulic cylinder when the large door body is swung in the opening direction, When the pair of weight arms is provided, the piston rod of one hydraulic cylinder is disposed between the pair of left and right weight arms, and the tip shaft provided at the tip of the piston rod is a pair of left and right weight arms. The weight arms may protrude left and right so as to engage with the engagement stoppers provided on the respective weight arms.

  Furthermore, as one aspect of the present invention, in order to solve the problem of effectively using the space between the weight arms generated for supporting the door body main body at multiple points by the plurality of door body support shafts, When the door body boss part to which the pair of left and right weight arms is fixed is arranged in parallel, the balance weight is supported between the weight arms adjacent to each other between the door body boss parts. May be.

  ADVANTAGE OF THE INVENTION According to this invention, it can install in a large sluice gate, maintaining the function as a flap gate.

It is a side view which shows one Embodiment of the multipoint support type flap gate which concerns on this invention. It is a perspective view which shows the door body support means, door body, and hydraulic cylinder in the multipoint support type flap gate of this embodiment. It is a perspective view which shows the door body support means and hydraulic cylinder in this embodiment. It is a front view which shows the door body support means, weight arm, and hydraulic cylinder in the multipoint support type flap gate of this embodiment. It is a front view which shows the door support unit in this embodiment. It is a side view which shows the front-end | tip part of the door body support unit in this embodiment. It is a side view which shows the state by which the hydraulic cylinder in this embodiment was extended | stretched along the guide member. It is a side view which shows the state by which the hydraulic cylinder in this embodiment was contracted along the guide member. It is a perspective view which shows the door body in this embodiment. It is a side view which shows the weight arm in this embodiment, a door body boss | hub part, and a support arm. It is a schematic diagram which shows the holding | maintenance mode of the hydraulic opening / closing means and hydraulic control means in this embodiment. It is a schematic diagram which shows the contraction mode of the hydraulic opening-closing means and hydraulic control means in this embodiment. It is a schematic diagram which shows the expansion | extension mode of the hydraulic opening / closing means and hydraulic control means in this embodiment. It is a side view which shows the state which the multipoint support type flap gate of this embodiment closed the opening part.

  Hereinafter, an embodiment of a multi-point support flap gate according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the multipoint support type flap gate 1 of the present embodiment includes a door body supporting means 2 provided above the large sluice 10 and a large door body supported by the door body supporting means 2. 3 and hydraulic opening / closing means 4 for opening and closing the large door 3. Hereinafter, each configuration will be described in detail.

  The large sluice 10 according to the present invention includes a large lock, a large lock, a large lock, and the like, and is an opening for discharging river water, domestic wastewater, or the like into a river, a lake, or the sea. Part 11. In addition, as shown in FIG. 2, the opening 11 in the present embodiment has a large opening having a horizontally long rectangular shape, and the opening 11 as a whole is provided by providing two multi-point support type flap gates 1. In the following, since these two units have the same structure and operation, only one multi-point support type flap gate 1 will be described, and the other multi-point support type flap gate 1 will be described. Is omitted.

  The door body support means 2 supports the large door body 3 in a swingable manner above the opening 11 of the large water gate 10. The door body support means 2 comprises at least three or more door body support units 21 so that the large door body 3 can be supported at multiple points. As shown in FIG. 4, the door support unit 21 is composed of four doors.

  As shown in FIGS. 3 and 4, each door body support unit 21 includes a door body support shaft 22 that supports the large door body 3, and a bearing bracket 23 that supports both ends of the door body support shaft 22.

  The door body support shaft 22 is a columnar bar. Further, as shown in FIG. 5, a pair of left and right spacers 24 fitted to be higher by one step according to the gap width between the door body boss portion 33 and the bearing bracket 23 are provided at the left and right center positions. The door support shaft 22 is formed in a short length as compared with the rotation shaft in the conventional flap gate, thereby suppressing the bending when the large door 3 is supported, and the large door 3 is smooth. Can be swung. In addition, fixing grooves 26 into which fixing plates 25 for fixing to the bearing bracket 23 are inserted are formed at two positions on the left and right ends of the door support shaft 22. As shown in FIG. 6, the fixing groove 26 has a bottom that is formed in a straight line. The fixing groove 26 is fitted into a substantially rectangular fixing plate 25 and fixed to the side surface of the bearing bracket 23 to fix the door support shaft 22. It is fixed so that it cannot rotate.

  Further, the door support shafts 22 are arranged on the same axis as shown in FIGS. 2 and 3 so that the large door 3 can be smoothly swung.

  The bearing bracket 23 is for fixing the door body support shaft 22 above the opening 11. As shown in FIG. 5, both ends of the door body support shaft 22 are fixed by a pair of left and right bearing brackets 23. ing. As shown in FIGS. 3 and 6, an insertion hole 28 through which the door body support shaft 22 is inserted is formed in the distal end portion 27 of each bearing bracket 23. Moreover, the front-end | tip part 27 is arrange | positioned in the position which protrudes from the outer upper surface of the structure which comprises the large sluice 10 to the external water side, as shown in FIG.

  The pair of left and right bearing brackets 23 at the two central portions guides a guide roller 68 provided at the tip of the hydraulic cylinder 6 as shown in FIGS. 2 to 4, 7 and 8. Is provided. The guide member 5 is formed in an arc shape along an arc-shaped locus along which an engagement stopper 7 described later moves. In addition, the guide member 5 is not limited to what is provided in the bearing bracket 23, For example, you may be fixed to the outer upper surface of the structure which comprises the large sluice 10.

  The large door body 3 opens and closes the opening 11 of the large sluice 10, and in this embodiment, as shown in FIG. 9, the door body main body 31 that can close the opening 11 of the large sluice 10, and each A plurality of door body boss portions 33 that are pivotally supported by respective door body support shafts 22 via bearings 32 made of sliding bearings or rolling bearings, and are fixed to the door body boss portions 33. And a plurality of support arms 34 supporting the door body 31 and a weight arm 35 fixed to the door boss 33.

  The door body 31 is formed to be slightly larger than the opening 11 so that the opening 11 can be completely closed. In the present embodiment, the door body 31 is formed in a substantially rectangular shape. The door body 31 is made of a steel plate or the like, and has a lattice-like shape formed on the outside water side surface by a steel material such as H-shaped steel, I-shaped steel, or C-shaped steel so that it can withstand external force such as tsunami water pressure. The reinforcing frame 36 is fixed by welding or the like. In addition, the steel material used for the reinforcement frame 36 is not limited to the thing of standard specifications, such as JIS, You may select suitably from the thing outside a specification.

  Further, as shown in FIG. 1, a door body float 37 is provided on the inner water side surface of the door body 31. This float 37 for door bodies assists opening and closing of the large-sized door body 3 by the buoyancy obtained according to the water level on the outside water side or the water level on the inside water side. At a position of a predetermined height that does not contact, the floating center is provided so as to protrude toward the inner water surface side so as to be on the inner water side with respect to the center of gravity of the large door body 3.

  The door boss 33 is pivotally supported with respect to the door support shaft 22 and is formed in a thick cylindrical shape capable of supporting the weight of the door body 31. A bearing 32 made of a sliding bearing or a rolling bearing for reducing the frictional force with the door body support shaft 22 is provided on the inner peripheral surface of the door body boss portion 33 that is in contact with the door body support shaft 22. In the present embodiment, a sliding bearing having a high load resistance is used in order to support the large door body 3 which is enlarged and increased in weight by each door body boss portion 33. As shown in FIGS. 2 and 4, the door boss 33 is pivotally supported at an intermediate position between the spacers 24 so as not to be displaced in the left-right direction on the door support shaft 22.

  The bearing 32 is not limited to a sliding bearing, and a rolling bearing having a high frictional force reduction capability may be used in consideration of the weight of the door body 31 and the like.

  The support arm 34 is fixed to the door body boss portion 33 and supports the door body main body 31. As shown in FIGS. 2 and 9, the support arm 34 in the present embodiment extends downward from the door body boss portion 33 and is fixed to the outside water surface side of the door body main body 31. .

  The weight arm 35 supports a balance weight 38 that adjusts the weight balance of the entire large door body 3 in order to smoothly open and close the large door body 3, and as shown in FIG. When the door body 31) is in a vertical state, it is fixed with bolts so as to extend obliquely upward on the outside water side from the door body boss portion 33. In this embodiment, as shown in FIGS. 2 and 4, one weight arm 35 is fixed to each of the door body boss portions 33 located at the left and right ends of the four door body boss portions 33, and is formed at the center. A pair of left and right weight arms 35 are fixed to the two door body boss portions 33 positioned. The fixing method of the weight arm 35 is not limited to bolting, and may be appropriately selected from fixing methods such as welding.

  The weight arm 35 supports a balance weight 38 at the upper end. The balance weight 38 is adjusted to such a weight balance that the door body body 31 side is slightly heavier around the door body support shaft 22 when the large door body 3 is in an open state, and an external force other than gravity must be applied. For example, the large door 3 closes the opening 11 by its own weight balance or slightly opens at an angle similar to the initial opening of the conventional flap gate. In the present embodiment, the balance is adjusted to completely close the opening 11. As shown in FIGS. 2, 4 and 9, the balance weight 38 is supported between the weight arms 35 at the upper end portion of the weight arm 35. In particular, in the present embodiment, the door body boss portion 33 to which the pair of left and right weight arms 35 are fixed is provided side by side, and the door arm boss portions 33 are also adjacent to each other between the adjacent weight arms 35. A balance weight 38 is supported. Thereby, the space between the weight arms 35 generated to support the door body main body 31 at multiple points by the plurality of door body support shafts 22 is effectively used.

  Further, as shown in FIG. 10, the weight arm 35 is engaged with the tip of the piston rod 61 of the hydraulic cylinder 6 of the hydraulic opening / closing means 4 to be described below to transmit the hydraulic power by the hydraulic cylinder 6. An engagement stopper 7 is provided. That is, the weight arm 35 in the present embodiment also has a function as a torque arm for generating torque for swinging the large door body 3 by the hydraulic cylinder 6.

  The hydraulic opening / closing means 4 is for opening and closing the large door body 3. In the present embodiment, the hydraulic opening / closing means 4 mainly includes a hydraulic cylinder 6 installed so that a base end portion thereof is swingable above the large sluice gate 10. An engagement stopper 7 that is provided on the weight arm 35 and engages with the tip of the piston rod 61 of the hydraulic cylinder 6 to transmit hydraulic power to the weight arm 35; and the hydraulic pressure of the hydraulic cylinder 6 And hydraulic control means 8 for controlling.

  The hydraulic cylinder 6 is an actuator that expands and contracts by hydraulic pressure. As shown in FIG. 11, the hydraulic cylinder 6 in the present embodiment has a cylindrical cylinder case 62 and a piston rod 61 that reciprocates by hydraulic pressure in the cylinder case 62.

  The piston rod 61 includes a piston portion 63 that reciprocates within the cylinder case 62 and a rod portion 64 that extends from the piston portion 63 and that protrudes from the cylinder case 62. The piston portion 63 divides the inside of the cylinder case 62 into two oil chambers, a front end side oil chamber 65 and a rear end side oil chamber 66, and injects hydraulic oil into one oil chamber and supplies the other oil. The hydraulic oil is discharged from the chamber so as to move along the cylinder case 62. That is, when the piston part 63 moves along the cylinder case 62 and the length by which the rod part 64 protrudes from the cylinder case 62 changes, the entire hydraulic cylinder 6 expands and contracts.

  Further, as shown in FIGS. 2 to 4, the rod portion 64 in the present embodiment is provided with a tip shaft 67 at the tip portion so as to be orthogonal to the rod portion 64. The tip shaft 67 is provided so as to protrude left and right, and engages with an engagement stopper 7 provided on each of the pair of left and right weight arms 35. In addition, guide rollers 68 formed in a circular shape like a tire are rotatably provided at the left and right ends of the tip shaft 67 so as to be easily moved along the guide member 5 provided on the bearing bracket 23. ing.

  The engagement stopper 7 engages the distal end shaft 67, and is formed in a semicircular shape as shown in FIG. 10, and is provided so that its concave surface faces the outside water side. Thus, the engagement stopper 7 is engaged with the distal end shaft 67 of the distal end portion of the piston rod 61 only when the engagement stopper 7 is swung in the opening direction by the hydraulic cylinder 6. It is possible to leave. As shown in FIGS. 2, 4, and 9, the engagement stopper 7 in the present embodiment is provided on each weight arm 35 provided in a pair of left and right with respect to the door boss 33, and the piston rod The front end portion 61 is configured to be engageable with both the left and right ends of the front end shaft 67 protruding left and right.

  The hydraulic control means 8 controls the hydraulic pressure of the hydraulic cylinder 6 and mainly includes a hydraulic unit 87 and a valve opening / closing control device 85 as shown in FIG. The hydraulic unit 87 stores a hydraulic pump 81 that feeds hydraulic oil to the hydraulic cylinder 6, a switching electromagnetic valve 82 that switches a destination of the hydraulic oil to each oil chamber of the hydraulic cylinder 6, and the hydraulic oil. The hydraulic oil tank 83 is connected to each other, the pipe 84 connecting these components, and the pilot check valve 88 that keeps the door 3 fully open.

  The hydraulic pump 81 supplies hydraulic oil to the hydraulic cylinder 6 and includes a general hydraulic pump used for supplying oil to the hydraulic cylinder 6.

  The switching electromagnetic valve 82 includes a switching valve body 86 that switches between the front end side oil chamber 65 and the rear end side oil chamber 66 that are communicated with the hydraulic pump 81, and the switching valve body 86 that is not shown in the drawing. And a solenoid to be switched.

  As shown in FIG. 11, the switching valve body 86 is a holding mode in which the pilot check valve 88 blocks the hydraulic pump 81, the hydraulic cylinder 6, and the hydraulic oil tank 83 and keeps the length of the hydraulic cylinder 6. 12, the hydraulic pump 81 and the front end side oil chamber 65 of the hydraulic cylinder 6 are connected, and the rear end side oil chamber 66 and the hydraulic oil tank 83 are connected to contract the hydraulic cylinder 6. As shown in FIG. 13, the contraction mode and the contraction mode connect the hydraulic pump 81 and the rear end side oil chamber 66 of the hydraulic cylinder 6 and connect the front end side oil chamber 65 and the hydraulic oil tank 83. And an extension mode for extending the hydraulic cylinder 6.

  The solenoid uses electromagnetic force to convert electrical energy into mechanical motion. In this embodiment, the solenoid valve is switched to the holding mode, the contraction mode or the extension mode by switching the switching valve body 86 to the left and right. It is supposed to be.

  The pilot check valve 88 shuts off the flow of the hydraulic oil in the piping 84 in the holding mode and holds the large door 3 in a fully open state. The hydraulic check cylinder 88 is a hydraulic cylinder until the hydraulic oil is supplied by the hydraulic pump 81. The pressure on the 6th side is held.

  The valve opening / closing control device 85 controls the switching electromagnetic valve 82. In this embodiment, a current is appropriately supplied to the solenoid of the switching electromagnetic valve 82 by a switch operation or the like.

  Next, the operation of each component in the multipoint support flap gate 1 of the present embodiment will be described.

  First, the case where the large door 3 is opened from the state in which the opening 11 of the large sluice 10 is closed to the fully opened state will be described.

  In order to contract the hydraulic cylinder 6, the valve opening / closing control device 85 supplies a current to the solenoid of the switching electromagnetic valve 82 to switch the switching valve body 86 to the contracting mode. Accordingly, as shown in FIG. 12, the hydraulic pump 81 and the front end side oil chamber 65 of the hydraulic cylinder 6 are connected, and the rear end side oil chamber 66 and the hydraulic oil tank 83 are connected.

  The hydraulic pump 81 injects hydraulic oil into the front end side oil chamber 65 of the hydraulic cylinder 6 via the piping 84. The piston part 63 of the piston rod 61 is pushed by the hydraulic pressure of the injected hydraulic oil and moves to the rear end side. On the other hand, the hydraulic oil accumulated in the rear end side oil chamber 66 of the hydraulic cylinder 6 is pushed out by the piston portion 63 and discharged to the hydraulic oil tank 83 through the piping 84. Thus, when the piston part 63 moves by hydraulic pressure, the entire length of the hydraulic cylinder 6 contracts.

  When the hydraulic cylinder 6 contracts, the tip shaft 67 provided at the tip of the piston rod 61 engages with the engagement stopper 7 provided at the weight arm 35. In this embodiment, it engages with the engagement stopper 7 provided in each of the weight arms 35 provided in a pair of left and right with respect to the door body boss portion 33. The distal end shaft 67 can attract the weight arm 35 equally on the left and right sides, so that no torsional stress is applied to the lot portion.

  When the hydraulic cylinder 6 contracts, the guide roller 68 moves along the arc of the guide member 5 as shown in FIGS. For this reason, it can move smoothly while maintaining the state where the tip shaft 67 is engaged with the engagement stopper 7. Further, a balance weight 38 is provided at the upper end of the weight arm 35, and the door body 31 is balanced so that it is slightly heavier. Therefore, the contraction force required for full opening is small, and it can be opened with a light force. Can be rotated in the direction.

  Then, when the hydraulic cylinder 6 is completely contracted, the weight arm 35 is pulled toward the inside water as shown in FIG. 1, and the door body 31 is fully opened. In this state, the valve opening / closing control device 85 supplies current to the solenoid of the switching electromagnetic valve 82 to switch the switching valve body 86 to the holding mode, as shown in FIG. Thus, the pilot check valve 88 blocks the hydraulic pump 81, the hydraulic cylinder 6 and the piping 84 of the hydraulic oil tank 83, and the hydraulic oil cannot be moved. Therefore, the length of the hydraulic cylinder 6 is held in this contracted state, and the large door 3 is held in a fully opened state.

  Further, since the large door body 3 is supported at multiple points by the plurality of door body support units 21, the load of the large door body 3 is dispersed by each door body support unit 21. Therefore, there is little bending in each door body support shaft 22.

  Moreover, since each door body boss | hub part 33 is pivotally supported by each door body support shaft 22 via the bearing 32 which consists of a slide bearing or a rolling bearing, the large sized door body 3 is made into a closed state. When swinging from the fully open state or the fully open state to the closed state, the swing can be performed smoothly. In particular, in this embodiment, the large door body 3 is supported by three or more bearings 32 by fixing the rotation of each door body support shaft 22 and providing the bearing 32 on each door body boss portion 33 side. become. Therefore, the bearing 32 having a lower load-bearing performance than the conventional bearing supported only at two locations on both ends of the rotating shaft can be used and can be stably supported. Further, the bearing 32 is a consumable part and needs to be replaced periodically. In this embodiment, since the load of the large door 3 is dispersed, the usage period of the bearing 32 is extended, thereby reducing maintenance costs. Can do.

  Next, the case where the opening part 11 of the large sluice 10 is closed from a fully open state is demonstrated. In order to extend the hydraulic cylinder 6, the valve opening / closing control device 85 supplies a current to the solenoid of the switching electromagnetic valve 82 to switch the switching valve body 86 to the extension mode. As a result, as shown in FIG. 13, the hydraulic pump 81 and the rear end side oil chamber 66 of the hydraulic cylinder 6 are connected, and the front end side oil chamber 65 and the hydraulic oil tank 83 are connected.

  The hydraulic pump 81 injects hydraulic oil into the rear end side oil chamber 66 of the hydraulic cylinder 6 through the piping 84. The piston portion 63 of the piston rod 61 is pushed by the hydraulic pressure of the injected hydraulic oil and moves to the tip side. On the other hand, the hydraulic oil accumulated in the oil chamber 65 at the front end of the hydraulic cylinder 6 is pushed out by the piston portion 63 and discharged to the hydraulic oil tank 83 through the piping 84. Thus, when the piston part 63 moves by hydraulic pressure, the entire length of the hydraulic cylinder 6 extends.

  When the hydraulic cylinder 6 extends, the distal end shaft 67 provided at the distal end portion of the piston rod 61 extends while engaging with the engagement stopper 7 provided on the weight arm 35. At this time, the door body 31 side is supported with a weight balance that is heavier than the weight arm 35 side. Therefore, the large door body 3 swings in the direction of closing the opening 11 due to its weight balance. When the hydraulic cylinder 6 further expands, the large door body 3 comes into contact with the door stop of the opening 11 and closes the opening 11 as shown in FIG. Thus, in this embodiment, it is not necessary to extend the hydraulic cylinder 6 and press the large door 3 against the door to completely close the opening 11.

  Further, conventionally, in order to press the door body 31 that has increased in weight due to an increase in size against the opening 11, the hydraulic cylinder 6 that can withstand a buckling load corresponding to the weight is required. Since the tip shaft 67 of the hydraulic cylinder 6 is detachably provided, the hydraulic cylinder 6 is not subjected to a buckling load when the opening 11 is completely closed, and the probability of breakage can be reduced. Therefore, in this embodiment, the manufacturing cost concerning the hydraulic cylinder 6 can be suppressed.

  In addition, since the tip shaft 67 of the hydraulic cylinder 6 is provided so as to be detachable with respect to swinging in the closing direction when the opening 11 is closed, the multipoint support flap gate 1 of the present embodiment is Similarly to the conventional flap gate, it can be swung in the opening direction by the water pressure by the water flow from the upstream and drained.

  Further, since the guide member 5 is disposed at a position other than the door support shaft 22 in the large sluice 10, the weight of the hydraulic cylinder 6 is not applied at the time of swinging. Therefore, the door body main body 31 can be easily swung by the water pressure by the water flow from the upstream, and the drainage is performed smoothly.

According to the multipoint support flap gate 1 of the present embodiment as described above, the following effects can be obtained.
1. By supporting the enlarged door body at multiple points by at least three or more door body support units 21, the weight of the large door body 3 applied to each door body support shaft 22 can be dispersed. The shaft diameter can be reduced.
2. By narrowing the shaft diameter of each door support shaft 22, a narrow bearing 32 provided on the door boss 33 can be used, and a relatively inexpensive and highly versatile slide bearing or rolling bearing should be used. Can do.
3. Since the large door 3 is closed by its own weight balance, it is not necessary to press the large cylinder 3 with the hydraulic cylinder 6. The hydraulic cylinder 6 can be reduced in cost because it can be closed without being applied.
4). Since the engagement stopper 7 is detachable from the piston rod 61 with respect to the swing in the closing direction, it can be drained by being swung in the opening direction by water pressure when closed, like a conventional flap gate. .
5). When swinging in the opening direction due to water pressure, the tip of the piston rod 61 is supported by the guide member 5 disposed at a position other than the door support shaft 22, so that the weight of the hydraulic cylinder 6 is applied to the large door 3. In other words, the large door 3 can swing smoothly.
6). The pair of left and right weight arms 35 can also serve as torque arms, and the piston rod 61 of the hydraulic cylinder 6 disposed between them can be prevented from being twisted.
7). By supporting the balance weight 38 between the weight arms 35 adjacent to each other between the door boss portions 33 to which the pair of left and right weight arms 35 arranged side by side are fixed, the door body is supported by the plurality of door body support shafts 22. The space between the weight arms 35 generated for supporting the main body 31 at multiple points can be used effectively.

  In addition, the multipoint support type flap gate which concerns on this invention is not limited to embodiment mentioned above, It can change suitably. For example, in the present embodiment, the entire opening 11 is closed by installing two multi-point support type flap gates 1 alongside a large opening having a horizontally long rectangular shape. However, the present invention is not limited to this. Instead, the entire opening 11 may be closed by a single multi-point support type flap gate 1 having one door body body 31 having a horizontally long rectangular shape that can open and close the large opening.

DESCRIPTION OF SYMBOLS 1 Multi-point support type flap gate 2 Door body support means 3 Large door body 4 Hydraulic opening / closing means 5 Guide member 6 Hydraulic cylinder 7 Engagement stopper 8 Hydraulic control means 10 Large water gate 11 Opening portion 21 Door body support unit 22 Door body support Shaft 23 Bearing bracket 24 Spacer 25 Fixing plate 26 Fixing groove 27 Tip portion 28 Insertion hole 31 Door body main body 32 Bearing 33 Door body boss portion 34 Support arm 35 Weight arm 36 Reinforcement frame 37 Door body float 38 Balance weight 61 Piston rod 62 Cylinder case 63 Piston part 64 Rod part 65 Front end side oil chamber 66 Rear end side oil chamber 67 Front end shaft 68 Guide roller 81 Hydraulic pump 82 Switching solenoid valve 83 Hydraulic oil tank 84 Piping path 85 Valve opening / closing control device 86 Switching valve body 87 Hydraulic unit 88 Pilot check Lube

Claims (5)

A door body supporting means provided above the large sluice, a large door body swingable by the door body supporting means and supported by a weight balance that closes the opening of the large sluice, and the large door A large-sized flap gate having hydraulic opening and closing means for opening and closing the body,
The door body support means includes at least three door body support units, and each of these door body support units includes a door body support shaft for supporting the large door body, and supports each door body. The shafts are arranged coaxially with each other, and both ends of each door support shaft are fixed by bearing brackets,
The large door includes a door body that can close an opening of the large sluice, and a plurality of doors that are pivotally supported by each of the door support shafts via a slide bearing or a rolling bearing. A body boss portion and a plurality of support arms fixed to each of the door body boss portions and supporting the door body body, and the large door body includes a plurality of the door body support units. A multi-point supported flap gate that is supported by multiple points. A weight arm that supports a balance weight is fixed to the door boss portion,
The hydraulic opening and closing means engages with a hydraulic cylinder installed at a base end swingably above the large sluice gate, a weight arm and a tip end portion of a piston rod of the hydraulic cylinder. And an engagement stopper that transmits hydraulic power to the weight arm,
The engagement stopper engages with the piston rod only when the large door body is swung in the opening direction by the hydraulic cylinder, and is provided so as to be detachable with respect to swinging in the closing direction. 2. A multi-point support type flap gate according to 1. A guide roller is attached to the tip of the piston rod,
A guide member for guiding the guide roller along an arcuate locus along which the engagement stopper moves when the large door opens and closes is disposed at a position other than the door support shaft in the large sluice. The multi-point support type flap gate according to claim 2.   When a pair of left and right weight arms are provided on one door body boss, one piston rod of the hydraulic cylinder is disposed between the pair of left and right weight arms, and at the tip of the piston rod. 4. The multipoint support according to claim 2, wherein the provided tip shaft protrudes left and right so as to engage with the engagement stopper provided on each of the pair of left and right weight arms. Type flap gate.   Among the door bosses, when the door bosses to which the pair of left and right weight arms are fixed are arranged side by side, the balance between the weight arms adjacent to each other between the door bosses. The multi-point support type flap gate according to claim 4, wherein the weight is supported.