JP3496145B2 - Tide gate - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tide gate installed on a shore or the like in order to prevent a disaster in which a region on the seashore is hit by a high tide and submerged in water.

[0002]

2. Description of the Related Art Conventionally, levees and concrete walls have been constructed for the purpose of protecting coastal areas from storm surge disasters. However, if the dike cannot be built due to the road, prepare a horizontal gate and use it by pulling it out when necessary, or if there is a river outflow, set up a gutter gate and usually raise the roller gate. The door of the slide gate is lowered when necessary to close the opening.

[0003]

In order to prevent a disaster caused by a high tide, it is basically necessary to construct a dike or a concrete wall, but it is necessary to raise the existing dike adjacent to the place where people live. When it becomes necessary, troublesome problems may occur. The reason is that the sunken ridge is bad due to the high embankment, the ventilation is obstructed, the living environment is bad, the visibility is narrowed, the scenery is bad, etc.
It is a situation where the people who live in it do not agree.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention seeks to provide a tide gate installed on the coast in such a case. In other words, in normal times, you lie flat
It secures sunlight and ventilation, preserves the landscape, and stands up to the required height in the event of high tide, preventing seawater from entering the land. In addition, by suspending the inverted T-shaped control rod on the land side head of the door body, it is configured to act as a pillar to prevent the fall when the standing door body receives water pressure of high tide, This is to improve the certainty of the disaster prevention function of the tide gate.

The tide gate of the present invention, therefore, comprises: a) a horizontal row of anchor bolts and fixing bases installed parallel to the top of the seawall on the vertical plane protruding from the upper end of the seawall of the seawall. The dual-use pressing plate is crushed into a flat rectangle when air is discharged. The open side of the air bag made of rubber-lined cloth with three closed sides and one open side is pressed against the vertical plane to seal the open side. At the same time, fix the air bag to the sea-side upper edge of the seawall. b) One side of a connecting plate made of rubberized cloth with sufficient strength is attached to the sea side of the above-mentioned holding plate that also serves as a fixing base by a pressing plate and bolts that protrude above the upper surface of the holding plate that also serves as a fixing base by an appropriate amount. The other side is slightly smaller than the weir width, and has a length in the width direction that is slightly smaller than the weir width and a length necessary to secure the standing height required when standing up. By firmly fixing the door plate made of steel plate to the holding plate that also serves as the fixing base, the door plate can be undulated and the water leakage between the two can be prevented. c) Furthermore, an inverted T-shaped control rod suspended swingably by an axis parallel to the center of rotation of the door body on the land side surface of the steel plate door body is the land side wall surface of the seawall. When the door stands up to the specified posture, the lateral protrusion of the lower end of the control rod is located on the lower surface of the guide metal because it is inserted into the guide groove of the guide metal that projects to the land side at the upper end of the guide metal. The door body stops due to the tension generated, and when the high pressure water pressure acts on the door body, the lower tip of the control rod is supported by the support base located under the base of the guide metal, and the door body falls further. If the door body is to be laid down further, the lower end of the control rod is pushed to the land side from the support base by the extrusion cylinder provided between the guide hardware and the support base, so that the control rod is moved to the guide groove. To descend. With this configuration, if an air pipe is connected to the air bag from the land-based air operating device, and compressed air is sent from the air operating device into the air bag, the air bag expands and the door body stands up. On the contrary, when air is discharged from the air bag, the air bag is flattened and the door body falls down.

According to the present invention, in the above-mentioned tide gate, instead of a row of horizontal anchor bolts installed parallel to the top of the seawall, a vertical projection of an anchor metal piece installed on the upper end of the seawall of the seawall. On the surface, the bolts screwed into one row of horizontal horizontal female screws and the holding plate that also serves as the fixing base, which are provided parallel to the top of the seawall, are crushed into a flat rectangle when air is exhausted. It is also characterized in that the open side of the open air bag made of rubberized cloth is pressed against the vertical plane to seal the open side and fix the air bag to the sea-side upper end of the seawall. Is.

Also, in the above-mentioned tide gates, the present invention is directed to strengthening the bending rigidity of the door body in the height direction, in which the elongated steel plate is placed on the sea-side surface of the door body in a posture perpendicular to the surface. It is also characterized by being attached by welding in a direction perpendicular to the rotation center of the.

According to the present invention, in each of the above-mentioned tide gates, the tide gates having a small gate width (about 2 to 3 m) are arranged side by side in the direction of extension of the center of rotation of the door body to provide a large width (about 10 to 300 m). It is also characterized by being a tide gate.

The present invention provides the above-mentioned tide gate,
An odd number of tide gates with a small gate width are installed side by side in the direction of extension of the center of rotation of the door, and even among these tide gates, the tide gate is stopped when the door stands up to a predetermined posture. The horizontal projection of the lower end of the control rod is omitted, and at the same time, by providing a steel plate that projects from the land side surface to the adjacent gate in the entire length of the side end of the door, When it stops in a predetermined standing posture due to the tension acting on, the protruding steel plate is supported by the land side surface of the side end of the adjacent odd-numbered tidal gate to prevent water leakage between the two doors. While preventing, the door body of the even-numbered tide gate is also stopped in a predetermined standing posture.

According to the present invention, in each of the above-mentioned tide gates, the compressed air stored in the air tank is used when the tide gate is erected by including an air tank having a sufficiently large volume in the air handling device. Is also characterized.

The present invention is also characterized in that, in each of the above-mentioned tide gates, a roadbed which is resistant to running of a vehicle and walking of a person is attached to the sea-side surface of a steel plate door body.

As described above, in order to solve the problem, it is important in the present invention to employ the holding plate that also serves as the fixing base.
The holding plate that also serves as a fixing base has the function that one part can hold the air bag,
Since it has a function of fixing the connecting plate that holds the door body together and a function of supporting the door body from below, it is possible to provide a tide gate having a simple structure.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a tide gate according to the present invention will be described below in detail with reference to the drawings. 1, 2,
3, 4, 5, 6, and 7 show an embodiment of the tide gate of the present invention. FIG. 1 is a rear view of the tide gate with the door standing upright, and FIG. 2 is a control. Fig. 3 is a cross-sectional view when the door stands up to a predetermined posture in which tension acts on the rod. Fig. 3 shows the control rod supported by the support stand that lifts the door as a result of the high tide acting on the tide gate where the door stands. 4 is a cross-sectional view of the tide gate in a supported state. Fig. 4 is a cross-sectional view of the tide gate that pushes the lower end of the control rod to the land side from the support base by the pushing cylinder to start the fall operation of the door body, and Fig. 5 is the door. Cross-sectional view of the tide gate with the body lying down, Figure 6 shows the door body,
FIG. 7 is an explanatory view of the assembly state of the control rod and the rotary shaft of the control rod, and FIG. 7 is an explanatory diagram of the shape of the air bag.

2, FIG. 3, FIG. 4 and FIG.
Anchor bolts 2 installed horizontally in a vertical plane 1 protruding from the upper edge of the seawall of the seawall and parallel to the top of the seawall are used as anchor bolts 2. By pressing the edge 5 of the air bag 5 against the vertical surface 1, the open side of the air bag 4 is sealed and at the same time, the air bag 4 is fixed to the sea-side upper end of the seawall.

At the end of the edge 5 of the open side of the air bag 4, there is a folded portion 7 of the reinforcing fiber which is protected by a resin rod 6 so that the bending radius of the reinforcing fiber is not too small, and is fixed. Corner 8 and vertical plane 1 of the lower end of the platform-holding plate 3
The edge 5 of the open side of the air bladder 4 is prevented from being pulled out by the tension acting on the air bladder 4 by being applied to the corner 9 at the lower end of the air bladder.

Next, one side of the connecting plate 10 made of rubberized cloth having a sufficient strength on the sea side surface of the fixing base / holding plate 3 is projected upward from the upper surface 11 of the fixing base / holding plate 3 by an appropriate amount. A door body 14 made of steel plate that is firmly fixed with a holding plate 12 and a bolt 13 and has a widthwise dimension that is slightly smaller than the weir width on the other side and a length necessary to secure a standing height required when standing up. By firmly fixing the holding plate 15 and the bolts 16 to the lower part of the sea side surface, the door body 14 made of a steel plate is undulated and connected to the holding plate 3 also serving as the fixing base, and at the same time water leakage between them is prevented. At the end of the connecting plate 10, there is a folded portion 18 of the reinforcing fiber which is protected by a resin rod 17 so that the bending radius of the reinforcing fiber is not too small. 19 and the corner 2 of the holding plate 14
It is applied to 0 to prevent the connecting plate 10 from being pulled out from a predetermined position by the acting tension. Further, the round steel bar 21 attached to the lower end of the door body 14 is a holding plate 3 which also serves as a fixing base.
At the same time as being supported by the upper surface 11 of the holding plate 12, it is also supported from the sea side through the connecting plate 10 by the portion 22 projecting upward, so that the door body 14 uses the round steel bar 21 as a rotation supporting point. Therefore, a smooth undulating movement can be performed.

In addition, an inverted T-shaped control rod 25 can be swung freely by a shaft 24 parallel to the center of rotation of the door body, which is supported by a bearing 23 provided on the land side of the head portion of the door body 14 made of steel plate. At the same time as hanging up to the sea, the oval guide groove 2 opened in the guide hardware 26 projecting to the land side at the upper end of the land wall surface of the seawall.
7, and a lateral projection 28 is formed on the lower end of the control rod 25.
To provide.

As shown in FIG. 2, when the steel plate door body 14 is erected to a predetermined upright posture, the lateral protruding portion 28 at the lower end of the control rod 25 suspended in a substantially vertical posture by its own weight. Since it hits the lower surface 29 of the base of the guide hardware 26, tension is generated in the control rod 25 and the door 14 stops. Then, as shown in FIG. 3, when a storm surge hits the upright steel-made door body 14 and the water pressure by the water surface 30 acts, the door body 14 may move a small amount to the laid side. However, in this case, since the lower surface of the lateral protruding portion 28 of the control rod 25 is supported by the support base 32 while being protected by the slip-out stopper 31, a compressive force acts on the control rod 25, and the fall motion of the door body 14 is prevented. Can be stopped.

Next, in order to make the standing door 14 fall down, as shown in FIG. 4, the lateral projection 28 at the lower end of the control rod 25 is pushed out to the land side from the support 32 and the stopper 31. Good. Therefore, the air pipe 34 attached to the head side of the air cylinder 33 whose center is aligned with the guide groove 27 of the guide metal 26 is connected to the air tank 37 via the opening / closing valve 35 and the flow rate adjusting valve 36. At the same time, it is connected to the air discharge unit 40 via the opening / closing valve 38 and the flow rate adjusting valve 39. at the same time,
The air pipe 41 attached to the bottom side of the air cylinder 33 is
Air tank 37 via on-off valve 42 and flow rate adjustment valve 43
At the same time, it is connected to the air discharge part 46 via the opening / closing valve 44 and the flow rate adjusting valve 45. In addition, an air compressor 48 is connected to the air tank 37 via a check valve 47 to store compressed air in the normal air tank 37.

Now, when the on-off valve 44 and the on-off valve 35 are closed and the on-off valve 42 and the on-off valve 38 are opened, the compressed air in the air tank 37 passes through the flow rate adjusting valve 43, the on-off valve 42 and the air pipe 41. The air flows into the bottom side of the air cylinder 33, and at the same time, the air on the head side of the air cylinder 33 is pushed and discharged to the atmosphere from the air discharge section 40 via the air pipe 34, the opening / closing valve 38, and the flow rate adjusting valve 39. Therefore, the head 49 of the piston causes the lateral protrusion 28 at the lower end of the control rod 25 to come off the support base 32 and the stopper 31.
It can be pushed to the land side. On the contrary, when the on-off valve 38 and the on-off valve 42 are closed and the on-off valve 35 and the on-off valve 44 are opened,
Compressed air in the air tank 37 flows into the head side of the air cylinder 33 via the flow rate adjusting valve 36, the on-off valve 35, and the air tube 34, and at the same time, the air on the bottom side of the air cylinder 33 is pushed to press the air tube. Since the air is discharged from the air discharge portion 46 into the atmosphere via 41, the opening / closing valve 44, and the flow rate adjusting valve 45, the head 49 of the piston is stored on the sea side of the support 32. This situation is shown in FIGS. 2, 3 and 5.

With the above construction, the air pipe 51 connected to the mouthpiece 50 at the lower part of the air bag 4 is guided to a high place by burying it in the concrete of the seawall, and the on-off valve 52 of the air operation device, the flow rate. Adjustment valve 53, open / close valve 54, flow rate adjustment valve 5
5, the air discharge part 56, and the air tank 37 are connected as shown in FIGS. 1, 2, 3, 4, and 5.

Then, the on-off valve 54 is closed and the on-off valve 52 is closed.
Is opened and compressed air is sent from the air tank 37 to the inside of the air bag 4 via the flow rate adjusting valve 53, the opening / closing valve 52, and the air pipe 51. As a result, the air bag 4 expands and the door 14 stands up. FIG. 2 is a cross-sectional view of this state. The door body 14 stands up to a predetermined posture, and tension is applied to the control rod 25 to stop the door body 14.
Has reached a predetermined height. FIG. 1 shows this state from the land side, and the air bag 4 is on the land side of the door body 14 and supports the door body 14 in almost the entire width.

Further, the on-off valve 52 is closed and the on-off valve 54 is opened so that the air having the pressure inside the air bag 4 is removed from the air pipe 5
FIG. 5 is a cross-sectional view showing a state in which the door body 14 is completely laid down as a result of being discharged into the atmosphere from the air discharge part 56 via the opening / closing valve 54, the flow rate adjusting valve 55. Since the bent portion 57 of the head portion of the door body 14 is supported on the upper surface of the tip of the guide hardware 26, a space is secured between the top of the seawall and the door body 14, so the air bag 4 is a door. It is not crushed by the body 14.

As shown in FIG. 6, there is a female screw 58 fitted to the bolt 16 for fixing the connecting plate 10 along the round steel bar 21 at the lower end of the door body 14, and the bearing 2 of the head bending portion 57.
A control rod 2 suspended swingably on a shaft 24 supported by
A lateral protruding portion 28 is attached to the lower end of 5.

As shown in FIG. 7, the air bag 4, which is manufactured so as to be crushed into a flat rectangle when air is discharged, has a widthwise dimension slightly smaller than the gate width and a door when inflated in a direction perpendicular thereto. It has the length required to push the body 14 up. Further, the rubberized cloth is folded back and closed continuously on three sides other than the open side to be pressed by the pressing plate 3 also serving as the fixing base. At the ends of the two rubber-coated cloths facing each other on the open side, there is a folded portion 7 of the reinforcing fiber, which is protected by a resin rod 6 so that the bending radius of the reinforcing fiber is not too small.

Further, a hole 59 through which the anchor bolt 2 penetrates in parallel with the folded-back portion 7 penetrates the edge 5 of the two plates made of rubberized cloth. A cap 50 is attached near the center of the rubberized cloth below the air bag 4.

FIG. 8, FIG. 9 and FIG. 10 show another embodiment of the tide gate according to the present invention. FIG. 8 is a rear view of the tide gate group in an independent state, and FIG. FIG. 10 is an explanatory view showing an overlapping state of door bodies of adjacent tide gates in a standing state in a sectional view of even-numbered tide gates having control rods without protrusions. FIG. 8 shows a case where three tide gates each having a small width are installed side by side as an example of a tide gate group composed of an odd number of tide gates, and is a rear view in a state where the tide gate groups are erected. The odd-numbered tide gates (1st and 3rd) in FIG. 8 are the same as the tide gates shown in FIGS. 1 to 7, and are suspended from the head of the door 101 on the land side so as to be swingable. Reverse T-shaped control rod 25
Has both a function of stopping the door body by generating tension when the door body 101 stands up to a predetermined posture, and a function of supporting the door body 101 which receives the water pressure of high tide on the land side so as not to fall down. Owns.

However, the even tide gate (second)
Since the lower end of the control rod 103 that is swingably suspended on the head of the door body 102 of FIG.
No. 3 does not have a function to stop the door body by generating tension when the door body 102 stands up to a predetermined posture, so that the door body 102 that receives the water pressure of high tide is supported on the land side and does not fall down. It has only the function to do. FIG. 9 shows a sectional view of a state in which the even-numbered tide gates are erected. FIG. 9 is a cross-sectional view in which the odd-numbered tide gates are erected, and the lateral projection 28 at the lower end of the control rod 25 is deleted from FIG. Further, on the land side surface of the side end portion of the door body 102 of the even-numbered tide gate, a steel plate 104 protruding toward the door body 101 of the odd-numbered tide gate in the entire length is provided. Now, the on-off valve 54 of the air control device installed at a high place is closed, the on-off valve 52 is opened, and the air tank 37 is compressed into the air bag 4 via the flow rate adjusting valve 53, the on-off valve 52, and the air pipe 51. As a result of the air being fed in, the air bag 4 is inflated, the door body 101 and the door body 102 perform an upright motion together, and upright to a predetermined posture.

First, the door body 101 of the odd-numbered tide gate
However, the tension generated in the control rod 25 causes the control rod 25 to stop in a predetermined standing posture. Next, the bearing portion 105 on the land side surface of the side end portion of the door body 101 bears the steel plate 104 projecting along the entire length of the side end portion of the door body 102 of the even-numbered tide gate that is still trying to continue the standing motion. Since it overlaps with the portion 106 and supports while preventing water leakage between both door bodies, the door body 102 also stops in a predetermined standing posture. The bearings 105 and 10
FIG. 10 is an explanatory view of the situation where 6 overlaps. In this embodiment, when a large tide gate is installed by arranging a large number of tide gates having a small gate width in the extension direction of the center of rotation of the door body, in order to prevent water leakage between adjacent tide gates, It is possible to separate the doors of both tide gates by using a method in which the side edges of adjacent doors overlap each other, rather than connecting them all together with a rubber plate. showed that. With this configuration, it is possible to raise the doors of each tide gate of the tide gate group independently by human power or by a temporary crane, and the air handling device is operated due to damage to the air bag or insufficient pressure in the air tank. Even in an emergency situation where it is impossible to stand up the tide gate, it is possible to take emergency measures to raise the door to ensure the function of the tide gate.

[0030]

EFFECTS OF THE INVENTION In the tide gate of the present invention, the fixing board / holding plate 3 is at the top of the sea-side wall of the seawall, and (a) the function of the holding plate for sealing and fixing the air bag, b) A function of fixing a tie plate made of rubberized cloth, which has two functions, that is, the function of undulating the door body and the function of the lower watertight rubber,
(C) Since it is a main component that achieves the three important functions of supporting the door from below, it was possible to make a very inexpensive gate with a small number of components. Further, in the door body made of a steel plate which is moored by a tie plate made of rubberized cloth having sufficient strength and flexibility, a rotary shaft and a bearing are not required, which is very inexpensive. Further, since the door body supported almost continuously in the width direction by the air bag is a steel plate door body having a low workability, this is also a factor that makes the gate very inexpensive.

In addition, by providing the air manipulator with an air tank having a sufficiently large volume and maintaining the air pressure normally required, the tide gate can be erected even if the air compressor does not operate. Therefore, A) The tide gate stands up even when there is a power outage, such as during a typhoon. B) Allowing longer operating times of the air compressor,
The drive motor is small and the maintenance cost is low. C) It is possible to shorten the standing operation time. I was able to realize the advantage. Further, in the tide gate of the present invention, the control rod for controlling the standing and falling of the door supports the door body that has been subjected to high tide water pressure on the land side, so that it is more excellent in safety as a disaster prevention gate. Became. In addition, when a large number of tide gates with a small gate width are installed side by side in the direction of extension of the rotation axis of the door to make a tide gate with a large width, the side edges of the door should be connected without connecting adjacent tide gates to each other. By adopting a structure in which all the doors stop in a predetermined posture while preventing water leakage between each other by overlapping the steel plates protruding from the adjacent doors, the doors of each tide gate are manually operated separately. Or because it is possible to stand up with a temporary crane,
Even if the air handling device, that is, the rising operation of the tide gate with compressed air becomes impossible due to damage to the air bag or insufficient pressure in the air tank, the function of the tide gate can be ensured. A tide gate with excellent safety. As described above, the tide gate of the present invention is excellent in economic efficiency and is excellent in the performance as a disaster prevention gate. Therefore, providing it can bring great social benefits.

[Brief description of drawings]

FIG. 1 is a schematic rear view of the tide gate with the door standing upright, showing an embodiment of the tide gate of the present invention.

FIG. 2 is a schematic cross-sectional view of a tide gate with a door standing upright.

FIG. 3 is a schematic cross-sectional view of a tide gate with a control rod supported by a support supporting the door as a result of high tide water pressure acting on the tide gate with the door standing upright.

FIG. 4 is a schematic cross-sectional view of the tide gate in an upright posture in which the lower end of the control rod is pushed to the land side from the support base by the pushing cylinder to start the fall operation of the door body.

FIG. 5 is a schematic cross-sectional view of a state in which the tide gate is laid down.

FIG. 6 is an explanatory diagram of an assembled state of a door body, a control rod, and a shaft of the control rod.

FIG. 7 is a schematic explanatory view of the shape of an air bag.

FIG. 8 is a schematic rear view of the tide gate group in an upright state, showing another embodiment of the tide gate of the present invention.

FIG. 9 is a schematic cross-sectional view of an even-numbered tide gate with a door standing upright.

FIG. 10 is a schematic explanatory view of overlapping doors of adjacent tide gates.

[Explanation of symbols]

1 vertical plane 2 Anchor bolt 3 Presser plate that also serves as a fixed base 4 air bags 5 edges 6 rod 7 Folding part 8 and 9 corners 10 connecting board 11 upper surface 12 Presser plate 13 volt 14 Door body 15 Presser plate 16 volts 17 rod 18 Folding part 19, 20 square 21 Round bar steel 22 protruding part 23 Bearing 24 axes 25 control rod 26 Guide hardware 27 Guide groove 28 Lateral protrusion 29 Lower surface 30 water surface 31 retaining 32 support 33 air cylinder 34 air tube 35 on-off valve 36 Flow control valve 37 air tank 38 open / close valve 39 Flow control valve 40 Air release part 41 air tube 42 on-off valve 43 Flow control valve 44 open / close valve 45 Flow control valve 46 Air release unit 47 Check valve 48 air compressor 49 head 50 mouthpiece 51 air tube 52 Open / close valve 53 Flow control valve 54 on-off valve 55 Flow control valve 56 Air release part 57 Bending part 58 female screw 59 holes 101,102 door 103 control rod 104 Protruding steel plate 105, 106 bearing

─────────────────────────────────────────────────── --Continued from the front page (56) Reference JP 2000-144696 (JP, A) US Patent 4780024 (US, A) US Patent 5538360 (US, A) US Patent 5713699 (US, A) (58) Search Selected fields (Int.Cl. ⁷ , DB name) E02B 7/20 E02B ^7/ 40-7/44

Claims (7)

(57) [Claims] 1. A) A horizontal row of anchor bolts and a fixing base / holding plate installed in parallel with the top of the seawall are provided on the vertical plane protruding from the upper end of the seawall of the seawall. Crushes into a flat rectangle when discharged. By pressing the open side of the air bag made of rubber-lined cloth with three closed sides and one open side against the vertical plane, the open side is sealed and the air bag is protected against tide. Secure it to the upper edge of the bank on the sea side. b) One side of a connecting plate made of rubberized cloth with sufficient strength is attached to the sea side of the above-mentioned holding plate that also serves as a fixing base by a pressing plate and bolts that protrude above the upper surface of the holding plate that also serves as a fixing base by an appropriate amount. The other side is slightly smaller than the weir width, and has a length in the width direction that is slightly smaller than the weir width and a length necessary to secure the standing height required when standing up. By firmly fixing the door plate made of steel plate to the holding plate that also serves as the fixing base, the door plate can be undulated and the water leakage between the two can be prevented. c) Furthermore, an inverted T-shaped control rod suspended swingably by an axis parallel to the center of rotation of the door body on the land side surface of the steel plate door body is the land side wall surface of the seawall. When the door stands up to the specified posture, the lateral protrusion of the lower end of the control rod is located on the lower surface of the guide metal because it is inserted into the guide groove of the guide metal that projects to the land side at the upper end of the guide metal. The door body stops due to the tension generated, and when the high pressure water pressure acts on the door body, the lower tip of the control rod is supported by the support base located under the base of the guide metal, and the door body falls further. If the door body is to be laid down further, the lower end of the control rod is pushed to the land side from the support base by the extrusion cylinder provided between the guide hardware and the support base, so that the control rod is moved to the guide groove. To descend. With this configuration, if an air pipe is connected to the air bag from the land-based air operating device, and compressed air is sent from the air operating device into the air bag, the air bag expands and the door body stands up. When the air bag is discharged from the air bag, the air bag is flattened and the door body falls down. 2. The tide gate according to claim 1, wherein a protrusion of an anchor metal piece installed on the upper end of the sea wall of the seawall is used in place of a row of horizontal horizontal anchor bolts installed parallel to the top of the seawall. In the vertical plane, a row of horizontal horizontal bolts and a holding plate that also serves as a fixing stand, which are provided in parallel with the top of the seawall, are crushed into a flat rectangle when air is exhausted. One feature is that the air bag is fixed to the sea-side upper end of the seawall by sealing the open side by pressing the open side of the air bag made of rubberized cloth with one open side against the vertical plane. The tide gate. 3. The tide gate according to claim 1, wherein, for the purpose of strengthening the bending rigidity of the door in the height direction, an elongated steel plate is placed on the sea-side surface of the door in a posture perpendicular to the surface. A tide gate characterized by being welded in a direction perpendicular to the center of rotation of the door. 4. The tide gate according to any one of claims 1 to 3, wherein the tide gates having a small gate width (about 2 to 3 m) are arranged side by side in the extension direction of the center of rotation of the door to increase the width. (Approximately 10 to 300 m) A tide gate that is a tide gate. 5. The tide gate of claim 4, wherein an odd number of tide gates having a small gate width are arranged side by side in the direction of extension of the center of rotation of the door body. At the same time as omitting the lateral protrusion of the lower end of the control rod for stopping the door when standing up to a predetermined posture, a steel plate that projects from the land side to the adjacent gate in the entire length of the side end of the door is omitted. By providing
When the odd-numbered tide gates stop in a predetermined standing posture due to the tension acting on their control rods, the protruding steel plate overlaps the land side surface of the side end of the adjacent odd-numbered tide gates, A sea tide gate, characterized in that even while preventing water leakage between the door bodies, the door bodies of even-numbered sea tide gates are also stopped in a predetermined standing posture. 6. The tide gate according to any one of claims 1 to 5, wherein the air manipulating device includes an air tank having a sufficiently large volume so that when the tide gate is erected, compressed air stored in the air tank is stored. A sea tide gate characterized by being used. 7. The sea tide according to any one of claims 1 to 6, characterized in that a seabed surface of a steel plate door is provided with a roadbed that can withstand running of a vehicle or walking of a person. Gate.