JP4235255B2 - Pneumatic relief gate - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a pneumatic undulation gate having a rotation center at the bottom of a water channel and used for the purpose of weiring or discharging the water flowing in the water channel by standing up or lying freely.
[0002]
[Prior art]
Conventionally, as a undulation gate, a wire rope or chain is attached to the head of a steel door with a sufficiently strong cross or vertical girder against a steel plate (water stop plate) that receives water pressure, and this is landed. Various types have been developed, such as a type that winds up or rewinds with a hoisting machine and raises or falls, and a similar steel door body is pushed up with a hydraulic jack to stand up, and the hydraulic jack is shrunk to fall down Has been used.
[0003]
In recent years, a rubber tube reinforced with a cloth is fixed to the bottom of the waterway to withstand the internal air pressure and external force (water pressure, impact force received from the falling material, etc.) The cylinder of the rubber swells up and weirs the flowing water, and conversely, by opening the on-off valve and releasing air with internal pressure, the rubber cylinder is flattened by its own weight and water pressure, and the water that has been dammed up A so-called rubber weir that flows out has been developed and widely used.
[0004]
As described above, a wide variety of undulation gates have been developed and used, but in contrast to the current situation that each has advantages and disadvantages, it can solve technical problems and can be built at a much lower cost at the same time. In order to provide a relief gate, the applicants previously filed Japanese Patent Application Nos. 2001-116493 and 2001-116500, respectively.
[0005]
In the above invention, the open side of an air bag made of rubberized cloth made into a flat rectangle with three sides closed and one side opened by anchor bolts and presser plates placed side by side at the bottom of the channel with a rectangular cross section To fix the air bag to the bottom of the water channel while sealing the open side of the air bag,
In addition, a steel plate door that is installed along the downstream edge of the presser plate so that it can freely move up and down by the center of rotation located on the upper side of the air bag. By connecting an air pipe and sending compressed air into the air bag and inflating it, or by discharging air with pressure inside the air bag and shrinking it, the door body was made to stand or lie down It is a pneumatic relief gate.
[0006]
In other words, the pneumatic undulation gate of the present invention is strong against the external force of the undulation gate (water pressure, impact force received from the falling material, etc.) of the steel plate door body that has been used in the past, has wear resistance, and is intermediate. Taking advantage of the fact that it is stable even in an upright position, it has succeeded in introducing the economic efficiency equivalent to a rubber weir that supports the gate continuously in the width direction by an air bag, and is very inexpensive and easy to handle. It is a pneumatic relief gate.
[0007]
[Problems to be solved by the invention]
By the way, in the undulation gate of Japanese Patent Application No. 2001-116493, the undulation gate of Japanese Patent Application No. 2001-116500, etc., sufficient strength with one end fixed by an anchor bolt and a holding plate installed at an appropriate position downstream from the air bag at the bottom of the water channel. By fixing the other end of the belt made of rubberized cloth with a bolt and a holding plate at an appropriate position above the air bag on the downstream surface of the steel plate door body, the door body is brought to a predetermined posture. When standing up, the door is stopped due to the tension generated in the belt.
[0008]
Since this rubberized cloth band is flexible and allows a slight elongation, it has the advantage that the length can be easily adjusted when many bands are used side by side. In this case, the width and thickness of the belt are large and difficult to handle, and the presser plate and belt are both huge and expensive, and the state where the undulating gate stands is viewed from the back (from the downstream side). At times, the wide band became conspicuous and the impression was staggered, and the criticism that the landscape was not prepared was sometimes received.
[0009]
[Means for Solving the Problems]
Therefore, in the pneumatic undulation gate of the present invention, an apparently thin tensile material using a high-strength wire rope, a steel bar or the like is employed instead of the rubber-made cloth strip. In this way, the structure of the anchor hardware and the part attached to the projection on the downstream surface of the door body are also reduced in size, and the impression of the standing undulating gate as viewed from the back is not only greatly improved, but also very economical. It is.
However, on the other hand, when the door body falls over a wire rope or steel bar that has no direction in the cross section, it is reliably bent in the direction away from the rotation center of the door body and stored in the lower side of the door body. The technical problem of doing so remained.
[0010]
Therefore, according to the present invention, first, in a wire rope that is flexible to itself, the direction of the pin for attaching the wire rope to the protrusion on the downstream surface of the door made of steel plate and the anchor hardware is the same as the rotation center of the door. This problem was solved by making the distance from the rotation center of the door body to the mounting pin of the projection on the downstream surface of the door body sufficiently larger than the distance from the rotation center of the door body to the mounting pin of the anchor hardware . .
[0011]
That is, if the direction of the pin is the same direction as the center of rotation of the door body, and the protrusion mounting pin is installed farther than the anchor metal mounting pin, the wire rope that was pulled straight when the door body stood up will be When the door body falls down, it is surely bent in the direction away from the rotation center of the door body and stored in the lower side of the door body. This fact could be confirmed by experiments.
[0012]
Second, when using steel bars with compressive strength, two steel bars of appropriate length are joined together with a coupling pin in the same direction as the center of rotation of the door body, and at the same time When a projection is provided at an appropriate position close to each connecting pin of the bar, and the door body stands up to a predetermined position, this connecting pin is a straight line connecting the pin attached to the anchor hardware and the pin attached to the downstream surface of the door body. However, as the protrusions hit each other, the relative rotational movement of the two steel bars is limited, and a slight bending moment is induced around the coupling pin. did.
[0013]
In this way, when the door is standing, it is pulled strongly, but if the connecting pin connects the pin attached to the anchor hardware and the pin attached to the projection on the downstream surface of the door, it is a little farther from the center of rotation of the door. The two steel rods that have been induced to have a bending moment inside are securely bent when the door body falls and the connecting pin is bent away from the center of rotation of the door body and stored under the door body. It is done.
[0014]
In the pneumatic undulation gate, undulation gates with a large width (about 10 to 200 m) can be formed by arranging the undulation gates with a small gate width (about 2 to 3 m) side by side in the extending direction of the rotation center of the door body. It can be.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a pneumatic undulation gate according to the present invention will be described below in detail with reference to the drawings.
1, FIG. 2, FIG. 3, FIG. 4 and FIG. 5 show one embodiment of the pneumatic relief gate of the present invention, FIG. 1 is a rear view of the relief gate, and FIG. 2 is a sectional view of the relief gate. 3 shows a standing state, FIG. 3 is a sectional view of the undulating gate, shows a lying state, FIG. 4 is an explanatory view of a door body, and FIG. 5 is an explanatory view of an air bag.
[0016]
In FIG. 1, FIG. 2 and FIG. 3, vertical anchor bolts 2 installed in a row across the water channel on the concrete upper surface 1 at the bottom of the water channel having a rectangular cross section are fixed by the holding plate 3 and the three sides The open side of the air bag 4 is sealed by pressing the edge 5 of the open side of the rubber-filled air bag 4 made of a flat rectangle with one closed side against the top surface 1 of the concrete at the bottom of the channel. At the same time, the air bladder 4 is fixed to the upper surface 1 of the concrete at the bottom of the water channel.
At the end of the edge 5 of the open side of the air bag 4, there is a reinforcing fiber folded portion 7 which is protected by a resin rod 6 so that the bending radius of the reinforcing fiber is not too small. The edge 5 of the open side of the air bag 4 functions so as not to be pulled out by the tension acting on the air bag 4.
[0017]
Next, one side of the rubberized cloth-made connecting plate 10 having sufficient strength is firmly fixed to the upper surface of the fixing table / holding plate 3 by the bolt 11 and the holding plate 12, and the other side is a door 13 made of a steel plate. The steel plate door body 13 is connected to the fixing table / holding plate 3 in a undulating manner at the same time by being firmly fixed to the lower upstream surface by the bolt 14 and the holding plate 15. Water leakage between the door bodies 13 is prevented.
At the end of the connecting plate 10, there is a folded portion 17 of reinforcing fiber protected by a resin rod 16 so that the bending radius of the reinforcing fiber is not too small. It acts on the corner 19 on the downstream side of the presser plate 15 so that the connecting plate 10 is not pulled out from a predetermined position by the acting tension.
In addition, the wire rope 23 having sufficient strength is provided by the mounting pin 22 parallel to the center of rotation when the door body 13 is raised and lowered on the anchor hardware 21 installed on the foundation concrete 20 downstream of the air bag 4 at the bottom of the water channel. At the same time, the socket 24 at the other end of the wire rope 23 is mounted above the position where the air bag 4 on the downstream surface of the door body 13 is in contact with the socket 24 at the other end. The door is provided with a mounting pin 26 parallel to the center of rotation when the door body 13 is raised and lowered at a position where the distance from the center is sufficiently larger than the distance from the center of rotation of the door body 13 to the mounting pin 22 of the anchor hardware 21. The door body 13 is stopped by the tension acting on the wire rope 23 when the door body 13 stands up to a predetermined posture by being rotatably attached to the protrusion 27 of the body 13. Unisuru.
[0018]
As shown in FIG. 2, when the door body 13 stands up, the air bag 4 expands and pushes up the door body 13, while the tension acting on the wire rope 23 stops the door body 13 in a proper standing posture. Yes.
Moreover, when the bending part 28 of the head part of the door body 13 guides the water which overflows the door body 13 to the downstream side, the overflowing water, the driftwood flowing down together with the air bag 4, the wire rope 23, etc. Protect from hitting.
When the door body 13 performs a lying down movement from an upright posture, the wire rope 23 is required to bend in the direction away from the rotation center of the door body 13 so as not to overlap the air bag 4. The direction of the mounting pins 22, 26 is parallel to the direction of the rotation center of the door body 13, and the distance from the rotation center of the door body 13 to the mounting pin 26 reaches the mounting pin 22 from the rotation center of the door body 13. It is effective to be sufficiently larger than the distance.
[0019]
As shown in FIG. 3, the fallen door body 13 has air because the bent portion 28 of the head is supported by the support base 29 and the upper surface 1 of the concrete, the foundation concrete 20 and the door body 13 secure the necessary space. The bag 4 and the wire rope 23 are not crushed by the door body 13.
[0020]
As shown in FIG. 4, the steel plate door 13 has a width direction dimension slightly smaller than the weir width and a length necessary to ensure a standing height required for standing. A bent portion 28 is formed at the head of the door 13 and the lower end of the door 13 is welded with a round steel bar 30 having a diameter substantially equal to the thickness of the fixing table / holding plate 3 to cause the door 13 to move up and down. The lower end of the door body 13 makes the upper surface 31 of the air bag 4 slip easily. In addition, in the portion along the round bar 30 of the steel plate door body 13, female threads 32 into which the bolts 14 for fixing the connecting plate 10 are screwed are arranged in a row, and a socket 25 of the wire rope 23 is attached above the screw. There is a projection 27 attached by a pin 26, and the projection 27 has a pin hole 44.
[0021]
As shown in FIG. 5, the size of the open side of the air bag 4 manufactured in a flat rectangle with three sides closed and one side opened is slightly smaller than the gate width and expanded in a direction perpendicular to the gate width. Sometimes it has sufficient dimensions to push the door 13 up. And in fixing base combined pressing plate 3 sides other than the sides open to obtain press is at 3, closed curved broken rubberized fabric continuously. Further, in the open side, there is a folded portion 7 of the reinforcing fiber which is protected by the resin rod 6 so that the bending radius of the reinforcing fiber is not too small at the end of the edge 5 of the two rubberized cloths facing each other. . Further, a hole 33 through which the anchor bolt 2 passes in parallel with the folded portion 7 passes through the edges 5 of the two rubberized cloths. A base 34 is attached near the center of the rubberized cloth below the air bag 4.
[0022]
With this configuration, the air pipe 35 connected to the base 34 at the bottom of the air bag 4 is led to the land by burying it in the concrete of the water channel, and the exhaust on-off valve 36 of the air operating device, the exhaust flow rate adjustment 1, 2, and 3 are connected to the valve 37, the exhaust discharge unit 38, the supply air on-off valve 39, the air supply flow rate adjustment valve 40, and the air compressor 41.
[0023]
Then, as a result of press-fitting air into the air bag 4 from the air compressor 41 via the air supply flow rate adjustment valve 40, the air supply opening / closing valve 39, the air pipe 35, and the base 34, the door body 13 rises. FIG. 2 is a sectional view of the door body 13 in which the bent portion 28 functions to prevent the air bag 4 and the wire rope 23 from being hit by guiding the overflowing water downstream. Yes.
FIG. 1 shows this state viewed from the downstream side, and the air bag 4 is on the back side of the door body 13 and supports the door body 13 in almost the entire width.
[0024]
On the other hand, the air compressor 41 is stopped, the air supply on-off valve 39 is closed, the exhaust on-off valve 36 is opened, and the air having the pressure inside the air bag 4 is controlled by the exhaust flow control valve 37. FIG. 3 is a cross-sectional view of the state in which the door body 13 is completely laid down as a result of being released from the exhaust emission part 38 into the atmosphere.
In this state, earth and sand or the like may drastically flow down the bottom of the water channel, and therefore, an angle steel 43 is provided for reinforcement at the head of the water channel bottom 42 immediately upstream along the fixing plate / holding plate 3.
[0025]
6, FIG. 7, FIG. 8, FIG. 9 and FIG. 10 show another embodiment of the pneumatic relief gate according to the present invention, FIG. 6 is a rear view of the relief gate, and FIG. 7 is a cross section of the relief gate. FIG. 8 is a sectional view of the undulation gate and shows the lying state, FIG. 9 is an explanatory view of the assembled state of the bearing plate, the rotating shaft, and the door body, and FIG. It is explanatory drawing.
[0026]
6, 7, and 8, a bolt 63 that is screwed into a row of vertical female screws 62 provided on a laying object 61 installed across the water channel at the bottom of the water channel having a rectangular cross section is a bearing / holding plate 64. The edge 5 of the open side of the air bag 4 is pressed against the convex part 66 on the downstream side of the laying object 61 by pressing the edge 5 of the air bag 4 on the downstream side of the air bag 4, thereby simultaneously sealing the open side of the air bag 4. 4 is fixed to the metal fitting 61.
At the end of the edge 5 of the open side of the air bag 4, there is a reinforcing fiber folded portion 7 protected by a resin rod 6 so that the bending radius of the reinforcing fiber is not too small. The tension of the edge 5 of the open side of the air bag 4 acting on the air bag 4 against the upstream corner 67 of the downstream convex portion 65 and the upstream corner 68 of the downstream convex portion 66 of the deposit 61. Functions so that it will not be pulled out by.
[0027]
Further, when the bearing / holding plate 64 is pressed by the bolt 63, the upstream convex portion 69 is supported by the upstream convex portion 70 of the laying object 61, and the more the bolt 63 is screwed, the more downstream the bearing / holding plate 64 is. Since the convex portion 65 on the side presses the edge 5 of the open side of the air bag 4 more strongly, the open side of the air bag 4 is surely sealed and fixed.
[0028]
On the other hand, one side of one rubber plate 77 is fixed to the water stop surface 80 of the laying object 61 by the presser plate 78 and the bolt 79, and the other side is fixed to the lower part of the upstream surface of the door body 72 by the presser plate 81 and the bolt 82. At the same time, fixing between the presser plate 83 and the bolts 84 on the upper surface of the bearing / holding plate 64 in the middle prevents water leakage between the metal covering 61, the bearing / holding plate 64 and the door body 72.
In addition, a lower steel rod 87 having a sufficient strength is provided by a pin 86 parallel to the center of rotation when the door body 72 is raised and lowered on an anchor hardware 85 installed on the foundation concrete 20 downstream of the air bag 4 at the bottom of the water channel. At the same time that it is rotatably mounted, the distance from the rotation center of the door body 72 to the position of the anchor metal 85 is above the position where the air bag 4 contacts the downstream surface of the door body 72. The upper steel rod 90 having sufficient strength is formed on the protrusion 89 of the door body 72 by the pin 88 parallel to the center of rotation when the door body 72 is raised and lowered at a position that is sufficiently larger than the distance to the pin 86. The lower steel rod 87 and the upper steel rod 90 are rotatably connected to each other by a connecting pin 91 parallel to the pins 86 and 88.
[0029]
In addition, the lower steel rod 87 is provided with a protrusion 92 and the upper steel rod 90 is provided with a protrusion 93. When the door body 72 stands up to a predetermined posture, the coupling pin 91 is connected to the pin 86 of the anchor hardware 85 and the door body 72. Although the protrusions 92 and 93 are approaching a straight line connecting the pins 88 of the protrusions 89, the lower steel bar 87 and the upper steel bar 90 are relatively relative to each other with some bending left at the connecting pin 91. The rotational movement is limited, and the door 72 is held in a predetermined standing posture in a state where a slight bending moment is induced around the coupling pin 91. This state is shown in FIG.
In this way, when the door 72 is erected, the lower steel rod 87 and the upper steel rod 90 are receiving a strong tensile force, but the connecting pin 91 is smaller than the straight line connecting the pin 86 and the pin 88, but the door 72. Therefore, when the door body 72 falls down, the coupling pin 91 further moves away from the rotation center of the door body 72 and the lower steel rod 87 is moved. The upper steel bar 90 is completely bent and stored in the lower side of the door body 72. This state is shown in FIG.
[0030]
In FIG. 7, when the bent portion 94 of the head of the door body 72 rises, the water flowing over the door body 72 is guided to the downstream side and dropped, so that the overflowing water, the driftwood flowing down together, etc. are air bags. 4 and the lower steel rod 87, the upper steel rod 90, etc. are protected from being hit. In FIG. 8, the bent portion 94 at the head of the door body 72 is supported by the support hardware 100 to secure a necessary space between the door body 72 and the foundation concrete 20. The upper steel bar 90 and the like are not crushed by the door body 72.
[0031]
FIG. 9 is an explanatory view of an assembled state of the door body 72, the bearing / holding plate 64, and the rotating shaft 74.
The bearing 71 projecting at the downstream edge of the bearing / holding plate 64 is combined with the rotary shaft 74 in the recess 73 at the lower end of the door body 72, and the bearing 75 projecting at the lower end of the door body 72 at the same time is the downstream edge of the bearing / holding plate 64. Since the concave portion 76 is combined with the rotary shaft 74, the door body 72 is freely rotatable with respect to the bearing / holding plate 64 and can stand up or fall freely.
The bearing / holding plate 64 is provided with a counterbore hole 95 matched to the bolt 63 and a female screw 96 matched to the bolt 84 for fixing the middle of the rubber plate 77. On the other hand, the lower side of the door body 72 is provided with a female screw 97 matched with a bolt 82 for fixing the downstream side of the rubber plate 77, and a bending portion 94 is provided on the head. Further, there is a projection 89 for attaching the upper steel bar 90 at a position near the head of the downstream surface of the door body 72, and there is a hole 98 aligned with the pin 88.
[0032]
FIG. 10 is an explanatory view of the air bag 4 in this embodiment. In this embodiment, since the bolt 63 for pressing the bearing / holding plate 64 does not penetrate the air bag 4, it is not necessary to make a hole in the edge 5 of the opened side.
[0033]
With this configuration, the air pipe 35 connected to the base 34 at the bottom of the air bag 4 is led to the land by burying it in the concrete of the water channel, and the exhaust on-off valve 36 of the air operating device, the exhaust flow rate adjustment The valve 37, the exhaust discharge part 38, the supply air on-off valve 39, the air supply flow rate adjustment valve 40, and the air compressor 41 are connected as shown in FIGS.
[0034]
Then, as a result of press-fitting air into the air bag 4 from the air compressor 41 via the air supply flow rate adjusting valve 40, the air supply opening / closing valve 39, and the air pipe 35, the door body 72 is in an upright state. A cross-sectional view is shown in FIG. FIG. 6 is a rear view of this state viewed from the downstream side, and the air bag 4 is on the rear side of the door body 72 and supports the door body 72 in almost the entire width.
[0035]
On the other hand, the air compressor 41 is stopped, the air supply on-off valve 39 is closed, the exhaust on-off valve 36 is opened, and the air having the pressure inside the air bag 4 is controlled by the exhaust flow control valve 37. FIG. 8 is a cross-sectional view showing a state where the door body 72 has completely fallen down as a result of being released from the exhaust emission part 38 into the atmosphere.
[0036]
【The invention's effect】
According to the pneumatic hoisting gate of the present invention, the tension member to be held when the door body stands up to a predetermined posture is composed of two steel rods that can be bent by a strong wire rope or a connecting pin, When the door body 13 or 72 falls down, it can be surely bent away from the center of rotation of the door body 13 or 72 and stored under the door body 13 or 72. In addition to being very economical as compared with the conventional technology, there is a great effect that the installation adjustment is facilitated.
[0037]
In addition, wire ropes and steel bars are high strength materials, so their cross-sectional dimensions are so small that they are less noticeable when viewed from the back, simplifying the landscape behind the pneumatic relief gate when standing up. I was able to.
[Brief description of the drawings]
FIG. 1 is a rear view showing a standing state of an undulating gate.
FIG. 2 is a cross-sectional view showing an upright state of a relief gate.
FIG. 3 is a sectional view showing a collapsed state of the undulation gate.
FIG. 4 is an explanatory diagram of a door body.
FIG. 5 is an explanatory diagram of an air bag.
FIG. 6 shows another embodiment of the undulating gate according to the present invention, and is a rear view of the undulating gate in an upright state.
FIG. 7 is a cross-sectional view of a state in which the undulating gate is raised.
FIG. 8 is a cross-sectional view of a state in which the undulation gate has fallen down.
FIG. 9 is an explanatory diagram of an assembled state of the door body of the hoisting gate, the rotating shaft, and the holding plate for bearings.
FIG. 10 is an explanatory diagram of an air bag.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Concrete top surface 2 Anchor bolt 3 Fixing board / holding plate 4 Air bag 5 Edge of open side 6 Rod 7 Folding part 8, 9 Corner 10 Connecting plate 11 Bolt 12 Holding plate 13 Door body 14 Bolt 15 Holding plate 16 Rod 17 Folded section 18 Corner 19 Corner 20 Foundation concrete 21 Anchor metal 22 Mounting pin 23 Wire rope 24 Socket 25 Socket 26 Mounting pin 27 Projection 28 Bending section 29 Support base 30 Round bar 31 Upper surface 32 Female thread 33 Hole 34 Base 35 Air tube 36 Exhaust Open / close valve 37 Exhaust flow adjustment valve 38 Exhaust discharge part 39 Supply air open / close valve 40 Supply air flow adjustment valve 41 Air compressor 42 Water channel bottom 43 Angle steel 44 Pin hole 61 Female fitting 63 Female screw 63 Bolt 64 Plate 65, 66 Convex part 67, 68 Angle 69, 70 Convex part 71 Bearing 72 Door body 73 Concave part 74 Rotating shaft 5 Bearing 76 Recessed portion 77 Rubber plate 78 Presser plate 79 Bolt 80 Water stop surface 81 Presser plate 82 Bolt 83 Presser plate 84 Bolt 85 Anchor metal 86 Pin 87 Lower steel bar 88 Pin 89 Protrusion 90 Upper steel bar 91 Coupling pin 92 Protrusion 93 Protrusion 94 Bending part 95 Hole 96 with counterbore Female thread 97 Female thread 98 Hole 99 Reinforced steel plate 100 Support hardware

Claims (5)

The open side of the rubber-filled air bag made of a flat rectangular shape with 3 sides closed and 1 side opened by the vertical anchor bolt and presser plate installed side by side on the bottom of the channel with a rectangular cross section By holding down, the air bag is fixed to the bottom of the water channel while sealing the open side of the air bag, and can be raised and lowered by the center of rotation along the downstream edge of the press plate and on the upper side of the air bag. A steel plate door installed in such a manner connects an air pipe from a land-based air operating device to the air bag, inflates it by sending compressed air into the air bag, or has pressure inside the air bag In the pneumatic hoisting gate that allows the door to stand up or lie down by discharging air and shrinking,
In addition to a wire rope having an appropriate length and strength, one end of which can be freely rotated by a pin in the same direction as the center of rotation of the steel door, on an anchor hardware installed at the bottom of the water channel at an appropriate position downstream of the air bag. The steel plate door body is provided on the projection on the downstream surface of the steel plate door body, the end of which is located at a position where the distance from the rotation center of the steel plate door body is sufficiently larger than the distance from the rotation center to the pin of the anchor hardware. When the door body stands up to a predetermined posture, the door body is stopped by the tension acting on the wire rope,
On the other hand, when the door body falls down, the pneumatic hoisting gate is characterized in that the wire rope is bent in a direction away from the center of rotation and stored under the door body.   The pneumatic hoisting gate according to claim 1, wherein when the door made of steel plate stands up to a predetermined posture, the wire rope that stops the door by the tension acting on the door is replaced with a proper posture when the door is lying down. Using two steel rods with appropriate lengths and strengths connected by pins in the same direction as the rotation center of the door body at a position where it can be bent, the anchor hardware and the downstream surface of the door body By attaching the protrusions to the protrusions freely with pins in the same direction as the center of rotation of the door body, and providing the protrusions at appropriate positions near the pins where the two steel bars are joined, When standing up to a predetermined posture, the connecting pin is approaching a straight line connecting the pin attached to the anchor hardware and the pin attached to the protrusion on the downstream surface of the door body. When the door body falls down, it is ensured that the connecting pin is separated from the center of rotation of the door body in a direction in which a slight bending moment is induced around the pin. A pneumatic hoisting gate characterized in that a steel bar is bent and stored in the lower part of the door body. 3. A pneumatic undulation gate according to claim 1 or 2, wherein instead of anchor bolts arranged side by side across the bottom of the water channel, a row of vertical female screws arranged side by side on a laying object installed across the bottom of the water channel. the bolt and the retainer plate screwing is, when discharging air closes three sides which contracts flat rectangular, the sides open one side of rubberized fabric made of air bag opened by pressing down the deposit was opened A pneumatic undulation gate characterized in that the air bag is fixed to the laying object while the sides are sealed.   4. The pneumatic undulation gate according to claim 1, wherein for the purpose of enhancing the bending rigidity in the height direction of the door body, an elongated steel plate is disposed on the upstream surface of the door body in a posture perpendicular to the surface. Pneumatic undulation gate, which is attached by welding in a direction parallel to   5. The pneumatic undulation gate according to claim 1, wherein the undulation gates having a small gate width (about 2 to 3 m) are arranged side by side in the extending direction of the rotation center of the door body to increase the width (10 to 10 m). Pneumatic undulation gate characterized by being a waterway undulation gate.

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