JP3496142B2 - 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 coast or the like in order to prevent damage to a region on the seashore caused by high tide and being submerged.

[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, where a dike cannot be built due to the presence of roads, a sideways (sliding door) gate will be installed, and it will be pulled out and used when necessary. The doors of the roller gates and slide gates to be kept are lowered to close the openings when necessary.

[0003]

However, in order to prevent disasters due to storm surges like this, it is basically necessary to construct dikes and concrete walls. When it becomes necessary, trouble may occur. It may not be possible to obtain the consent of the people living in the area because of the sun rising due to the high embankment, the obstruction of ventilation, the narrowing of the field of view, and the impaired scenery.

[0004]

SUMMARY OF THE INVENTION The present invention intends to provide an undulating gate type tide gate installed on the coast in such a case. In other words, during normal times, it lays flat to secure sunlight and ventilation, preserves the landscape, and stands up to the required height in the event of high tides, preventing seawater from entering the land. Of. In addition, by suspending the inverted T-shaped control rod on the land side head of the door,
When the standing door body receives water pressure from high tide, it acts as a pillar to prevent collapse and improves the disaster prevention function of the tide gate.

That is, the tide gate of the present invention comprises: a) a row of horizontal anchor bolts and bearings installed horizontally on the vertical plane protruding from the upper end of the seawall surface of the levee, parallel to the crown of the tide. The plate is crushed into a flat rectangle when air is exhausted. 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 while sealing the open side. , Fix the air bag to the sea-side upper edge of the seawall. b) The lower end of the door body made of steel plate having a dimension in the width direction slightly smaller than the weir width and a length necessary to secure a required standing height when standing up, in the bearing protruding above the bearing / holding plate. The door body is rotatably attached by the rotating shaft by engaging the protruding bearing with. c) On the other hand, by attaching one rubber plate to the sea side of the bearing / holding plate and the sea side of the lower part of the steel plate door body with the bolt and the holding plate, respectively, between the bearing / holding plate and the door body. Prevent water leakage. d) Furthermore, an inverted T-shaped control rod suspended swingably by an axis parallel to the center of rotation of the door body is attached to the land side surface of the seawall on the land side wall surface of the steel plate door body. 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 the horizontal horizontal female threads in a row and the bearing / holding plate, 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.

The present invention provides the above-mentioned tide gates,
The tide gates with a small gate width (about 2 to 3 m) are arranged side by side in the extension direction of the rotation axis of the door body to make a tide gate with a large width (about 10 to 300 m). is there.

The present invention provides the above tide gate,
An odd number of tide gates with a small gate width are installed side by side in the extension direction of the rotation axis of the door, and in the even number tide gates, stop the door 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 overlaps the land side surface of the side end of the adjacent odd-numbered door body to prevent water leakage between both door bodies and It is also characterized in that the second door body is also stopped in a predetermined standing posture.

In the above-mentioned tide gates according to the present invention,
It is also characterized in that the air manipulating device includes an air tank having a sufficiently large volume so that the compressed air stored in the air tank is used when the tide gate is raised.

In the above-mentioned tide gates according to the present invention,
It is also characterized in that a roadbed that withstands the running of vehicles and the walking of people is attached to the sea-side surface of the steel plate door body.

[0012]

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 one 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 push-out cylinder, and starts the fall operation of the door body, and Fig. 5 is the door. Fig. 6 is a cross-sectional view of the tide gate with the body lying down, Fig. 6 is an explanatory view of the assembly situation of the bearing / holding plate, the rotary shaft, the door body, the control rod, and the rotary shaft of the control rod, and Fig. 7 is an air bag shape. FIG.

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 installed in one row. By pressing the edge 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. The lower end corner 8 of the dual-purpose holding plate 3 and the lower end corner 9 of the vertical surface 1 prevent the edge 5 of the open side of the air bag 4 from being pulled out by the tension acting on the air bag 4.

A bearing 1 protruding from the upper end of a bearing / holding plate 3
0 is combined with the rotating shaft 13 in the recess 12 at the lower end of the door body 11. At the same time, the bearing 14 protruding from the lower end of the door 11
Is combined with the rotary shaft 13 at the recess 15 at the upper end of the bearing / holding plate 3. Therefore, the door body 11 can freely move up and down while being supported by the fixed bearing / holding plate 3.

Further, one side of one rubber plate 16 is provided with a holding plate 17
By fixing the bearing / holding plate 3 to the upper part of the sea side of the bearing / holding plate 3 and fixing the other side to the lower part of the sea side of the door body 11 by the holding plate 19 and the bolt 20, the bearing / holding plate 3 and the door are fixed. Prevents water leakage between the bodies 11.

In addition, an inverted T-shaped control rod 24 can be swung freely by a shaft 23 parallel to the center of rotation of the door body, which is supported by a bearing 22 provided on the land side surface of the head of the door body 11 made of steel plate. At the same time as hanging up to the sea, the oval guide groove 2 opened in the guide hardware 25 projecting to the land side at the upper end of the land wall surface of the seawall.
6 and the lateral protrusion 27 at the lower end of the control rod 24.
To provide.

As shown in FIG. 2, when the door body 11 made of steel plate stands up to a predetermined standing posture, it becomes almost vertical due to its own weight, and the lower end of the control rod 24 suspended by the shaft 23 projects laterally. Since the portion 27 hits the lower surface 28 of the root portion of the guide hardware 25, tension is generated in the control rod 24 and the door 11 is stopped. Then, as shown in FIG. 3, when a storm surge hits the upright steel-made door body 11 and water pressure acts on the water surface 29, the door body 11 may move to the laid side by a small amount. However, in this case, the lateral projection 2 of the control rod 24
Since the lower surface of 7 is supported by the support base 31 while being protected by the stopper 30, a compressive force acts on the control rod 24 and the door body 1
It is possible to prevent the lodging motion of 1.

Next, in order to collapse the standing door body 11, as shown in FIG. 4, the lateral projection 27 at the lower end of the control rod 24 is pushed out to the land side from the support base 31 and the retaining member 30. Good. Therefore, the air pipe 33 attached to the head side of the air cylinder 32 whose center is aligned with the guide groove 26 of the guide metal 25 is connected to the air tank 36 via the opening / closing valve 34 and the flow rate adjusting valve 35. At the same time, it is connected to the air discharge unit 39 via the opening / closing valve 37 and the flow rate adjusting valve 38. at the same time,
The air pipe 40 attached to the bottom side of the air cylinder 32 is
Air tank 36 via on-off valve 41 and flow rate adjusting valve 42
At the same time, it is connected to the air discharge part 45 via the opening / closing valve 43 and the flow rate adjusting valve 44. In addition, an air compressor 47 is connected to the air tank 36 via a check valve 46 to store compressed air in the normal air tank 36.

Now, when the on-off valve 43 and the on-off valve 34 are closed and the on-off valve 41 and the on-off valve 37 are opened, the compressed air in the air tank 36 passes through the flow rate adjusting valve 42, the on-off valve 41 and the air pipe 40. The air flowing into the bottom side of the air cylinder 32 is simultaneously pushed by the air on the head side of the air cylinder 32, and is released into the atmosphere from the air release section 39 via the air pipe 33, the opening / closing valve 37, and the flow rate adjusting valve 38. Therefore, the head 48 of the piston causes the lateral protrusion 27 at the lower end of the control rod 24 to come off from the support base 31 and the stopper 30.
It can be pushed to the land side. On the contrary, when the on-off valve 41 and the on-off valve 37 are closed and the on-off valve 43 and the on-off valve 34 are opened,
Compressed air in the air tank 36 flows into the head side of the air cylinder 32 via the flow rate adjusting valve 35, the opening / closing valve 34, and the air tube 33, and at the same time, the air on the bottom side of the air cylinder 32 is pushed to push the air tube. Since the air is discharged from the air discharge portion 45 into the atmosphere via the valve 40, the on-off valve 43, and the flow rate adjustment valve 44, the head 48 of the piston is stored on the sea side of the support base 31. This situation is shown in FIGS. 2, 3 and 5.

With the above construction, the air pipe 50 connected to the mouthpiece 49 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 51 of the air manipulator, the flow rate. Adjustment valve 52, open / close valve 53, flow rate adjustment valve 5
4, the air discharge part 55, and the air tank 36 are connected as shown in FIGS. 1, 2, 3, 4, and 5.

Then, the on-off valve 53 is closed and the on-off valve 51 is closed.
The compressed air is sent from the air tank 36 to the inside of the air bag 4 through the flow rate control valve 52, the opening / closing valve 51, and the air pipe 50, and as a result, the air bag 4 expands and the door 11 stands up. FIG. 2 is a cross-sectional view of this state. The door body 11 stands up to a predetermined posture, tension is applied to the control rod 24, and the door body 11 is stopped.
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 11 and supports the door body 11 in almost the entire width.

Further, the on-off valve 51 is closed and the on-off valve 53 is opened, and 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 11 is completely laid down as a result of being released into the atmosphere from the air release portion 55 via the 0, the on-off valve 53, and the flow rate control valve 54. Since the bent portion 21 of the head portion of the door body 11 is supported on the upper surface of the tip of the guide hardware 25, a space is secured between the top end of the seawall and the door body 11, so the air bag 4 is a door. It is not crushed by the body 11.

As shown in FIG. 6, the bearing 10 protruding from the upper end of the bearing / holding plate 3 is engaged with the rotary shaft 13 in the recess 12 at the lower end of the door body 11, and the bearing 14 protruding from the lower end of the door body 11 at the same time. , The recess 1 at the upper end of the bearing / holding plate 3
5, the bearing / holding plate 3 and the door 11 are freely rotatable relative to each other by being combined with the rotary shaft 13. Further, the bearing / holding plate 3 is provided with a hole 56 matching the anchor bolt 2 and a female screw 57 matching the bolt 18 fixing one end of the rubber plate 16. Further, the door body 11 has a rubber plate 16
There is a female screw 58 that is fitted to the bolt 20 that fixes the other end of the. A lateral projection 27 is attached to the lower end of a control rod 24 that is swingably combined with a shaft 23 supported by a bearing 22 of a bent portion 21 of the head portion.

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 a length necessary to push up the body 11. Then, the rubberized cloth is continuously folded back and closed on three sides other than the open side to be pressed by the bearing / holding plate 3. 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 base 49 is attached near the center of the rubberized cloth below the air bag 4.

FIGS. 8, 9 and 10 show another embodiment of the tide gate according to the present invention. FIG. 8 is a schematic rear view of the tide gate group in a standing state, and FIG. FIG. 10 is a schematic cross-sectional view of an even-numbered tide gate having a control rod without a lateral protrusion, showing a standing state, and FIG. 10 is a schematic explanatory view of overlapping door bodies of adjacent tide gates. Fig. 8 shows an example of a tide gate group consisting of an odd number of tide gates, where three tide gates with a small width are installed side by side.
It is a rear view in the state where the tide gate group was standing. In Fig. 8, the odd numbered tide gates (1st and 3rd) are shown in Fig. 1.
The same as the tide gate shown in FIG.
The inverted T-shaped control rod 24, which is oscillatedly suspended on the head of the land surface of the vehicle, has a function of generating tension when the door body 101 stands up to a predetermined posture and stopping the door body. It has both the function of supporting the door body 101 that receives water pressure on the land side and preventing it from falling over.

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 sea tide gates are erected, and the lateral projection 27 at the lower end of the control rod 24 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 53 of the air control device installed at a high place is closed, the on-off valve 51 is opened, and the air tank 36 is compressed into the air bag 4 via the flow rate adjusting valve 52, the on-off valve 51, and the air pipe 50. As a result of the air being sent in, the air bag 4 is inflated, and the door bodies 101 and 102 perform an upright movement together to stand up to a predetermined posture.

First, the door body 101 of the odd-numbered tide gate
However, the tension generated in the control rod 24 causes the control rod 24 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 constructed by arranging a large number of tide gates having a small gate width side by side in the extension direction of the rotation axis of the door body, a means for preventing water leakage between adjacent tide gates. As a result, it is possible to separate each by not connecting all the doors of both tide gates with a rubber plate, but by connecting the side edges of adjacent doors to each other. Showed that there is. 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]

In the tide gate according to the present invention, the bearing / holding plate 3 is provided at the top end of the sea-side wall of the seawall, and (a) the air bag is sealed and fixed, and (b) the door body is freely undulated. Fixed, (c)
Since it is a main part that achieves the three important functions of fixing the lower watertight rubber, the structure with a small number of parts was a very simple and inexpensive gate. 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, in the unlikely event that the air bag is damaged, the air tank pressure is insufficient, etc.
That is, even when the rising operation of the tide gate cannot be performed with compressed air, the function of the tide gate can be ensured, and the tide gate is excellent in 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 assembly situation of a bearing / holding plate, a rotary shaft, 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 Bearing plate that also serves as a bearing 4 air bags 5 edges 6 rod 7 Folding part 8 and 9 corners 10 bearings 11 door body 12 recess 13 rotation axis 14 bearings 15 recess 16 rubber plate 17 Presser plate 18 volt 19 Presser plate 20 volts 21 Bending part 22 Bearing 23 axes 24 control rod 25 guide hardware 26 Guide groove 27 Lateral protrusion 28 Lower surface 29 Water surface 30 retaining 31 Support 32 air cylinder 33 air tube 34 on-off valve 35 Flow control valve 36 air tank 37 on-off valve 38 Flow control valve 39 Air release part 40 air tube 41 on-off valve 42 Flow control valve 43 open / close valve 44 Flow control valve 45 Air release part 46 Check valve 47 air compressor 48 heads 49 mouthpiece 50 air tubes 51 on-off valve 52 Flow control valve 53 on-off valve 54 Flow control valve 55 Air release part 56 holes 57 female screw 58 female screw 59 holes 101,102 door 103 control rod 104 Protruding steel plate 105, 106 bearing

─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP 2000-355924 (JP, A) US Patent 5713699 (US, A) US Patent 4780024 (US, A) US Patent 5538360 (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 installed horizontally parallel to the top of the seawall and a bearing / holding plate are arranged on the vertical plane protruding from the upper end of the seawall surface of the seawall. When it is discharged, it collapses into a flat rectangle. The open side of an air bag made of rubber-lined cloth with three closed sides and one open side is pressed against the above vertical plane to seal the open side and seal the air bag against the seawall. Secure it to the upper end of the sea b) The lower end of the door body made of steel plate having a dimension in the width direction slightly smaller than the weir width and a length necessary to secure a required standing height when standing up, in the bearing protruding above the bearing / holding plate. The door body is rotatably attached by the rotating shaft by engaging the protruding bearing with. c) On the other hand, by attaching one rubber plate to the sea side of the bearing / holding plate and the sea side of the lower part of the steel plate door body with the bolt and the holding plate, respectively, between the bearing / holding plate and the door body. Prevent water leakage. d) Furthermore, an inverted T-shaped control rod suspended swingably by an axis parallel to the center of rotation of the door is attached to the head of the land side of the steel plate door. When the door stands up to the specified posture, the lateral protrusion of the lower end of the control rod is located on the underside of the guide metal because it is inserted into the guide groove of the guide metal that protrudes 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, the bolts screwed into the horizontal horizontal female threads in a row and the bearing-holding plate provided parallel to the top of the seawall are crushed into a flat rectangle when air is exhausted. It is characterized in that the open side of the air bag made of rubber-lined cloth with the open side 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. 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 rotation axis of the door body to have a large 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 installed side by side in the extension direction of the rotation axis of the door body, and in the even tide gate, the door body is 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 sea tide gate is stopped in a predetermined standing posture by the tension acting on its control rod, the protruding steel plate overlaps the land side surface of the side end of the adjacent odd-numbered door body,
A tide gate characterized in that even number doors are stopped in a predetermined standing posture while preventing water leakage between both doors. 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 gate according to any one of claims 1 to 6, characterized in that a roadbed which is resistant to running of a vehicle or walking of a person is attached to a sea-side surface of a steel plate door body. .