JP2000154520A - Opening and closing device of gate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an opening and closing device of a gate being compact in the direction of height without impairing a view. SOLUTION: Column bodies 40, 40 provided with engaging projections 50,... at a plurality of steps in the direction height are provided on both right and left sides of a water channel 90. A hook part 30 engaged with the engaging projections 50,... and an expandable arm 20 moving the hook part 30 vertically and relatively to a door body 10 are attached to the door body 10 arranged between the column bodies 40 and 40. By combining the engaging operation of the hook part 30 in relation to the engaging projections 50,... and the expansion and shrinkage operation of the expandable arm part 20, the door body 10 is raised and lowered to open and close a gate without providing a constituent part supporting the door body 10 from above at substantially central position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water gate opening / closing device installed in a river, a waterway, a waterway of a dam, or the like, for adjusting a water flow rate and a water level in the waterway.

[0002]

2. Description of the Related Art FIG. 13 shows a conventional general gate opening / closing device.

[0003] As shown in this figure, a conventional general gate opening / closing device is provided with a U-shaped support frame 60 opened downward on a water channel 90, and the upper structure of the support frame 60. The door body 10 is suspended and supported inside the support frame 60 by the door body driving mechanism 70 arranged on the upper surface of the upper surface 61, and the door body 10 is moved up and down, so that the water flow rate in the water channel 90 is reduced. And water level adjustment.

Conventionally, as such a door driving mechanism 70, a wire rope 72 for suspending the door 10 as shown in FIG. In addition to the configuration of driving down, the door 10 is driven up and down by an expansion and contraction operation of a hydraulic cylinder having one end connected to the upper surface of the door body 10 and the other end to the upper structure portion 61 of the support frame body 60, or a screw is cut. The shaft body is attached to the upper surface of the door body 10 so as to be rotatable in the axial direction, and the driving body provided in the upper structure portion 61 rotates the shaft body in the axial direction. A moving configuration and the like are known.

[0005]

However, according to such a conventional floodgate opening / closing device, the door body 10 is supported by being suspended at a substantially central portion thereof. A door drive mechanism 70 that supports the door 10 and drives the door up and down must be disposed above the water channel 90. For this purpose, the support frame 60 has a U-shape having an upper structural portion 61 above the water channel 90. It was necessary to make it into a mold.

Therefore, in such a conventional gate opening / closing device, the supporting frame 60 is inevitably large in the height direction, so that the landscape is harmed and civil engineering work costs are increased. was there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a switchgear for a floodgate which is compact in height and does not harm the landscape.

[0008]

Means for Solving the Problems In order to solve the above problems, a water gate opening / closing device according to the present invention comprises a column provided on each of the left and right sides of a water channel and a vertical movement between the columns. A door body capable of damping a water flow on the water channel to adjust the water flow rate, and at a portion where the column and the door body are adjacent on both left and right sides of the water channel, one of the column and the door body On each side of the waterway,
A plurality of engagement portions are provided at predetermined height intervals, and the other is capable of switching between an engagement state in which one of the plurality of engagement portions is engaged and a disengagement state in which the engagement is released. A hook portion and a telescopic arm portion that couples the hook portion to the other portion while changing the relative height position with respect to the other portion are attached (claim 1).

According to the water gate opening / closing device having such a structure, the column and the door are located on both the left and right sides of the adjacent waterway.
When the hook and the telescopic arm provided on the other of the plurality of engaging portions provided on one of the pillar and the door operate in a predetermined procedure described later, the door is formed on the pillar. The body moves in the height direction relative to the body, and the movement opens and closes the water channel. That is, in this configuration, the door body is moved up and down by the operation mechanisms disposed on the left and right sides thereof, and it is not necessary to suspend and support the substantially center position of the door body from above, so that it is compact in the height direction. Can be configured.

The movement of the door body in the height direction in this device is performed as follows. That is, when the hook provided on the other side is engaged with the engaging part provided on one of the pillar and the door (engaged state), the hook is connected to the other. The other telescopic arm moves up and down relative to one of the telescopic arms by the telescopic operation. On the other hand, when the hook portion is not engaged with the engaging portion (disengaged state), the telescopic arm portion expands or contracts, or the other portion to which the hook portion is attached is provided with the engaging portion. By moving relative to one side in the height direction, the hook portion changes the height position with respect to the plurality of stages of the engaging portions, whereby the engaging portion with which this hook portion engages can be switched. Therefore, the other side provided with the hook portion is provided with the engaging portion by extending and contracting the telescopic arm portion while sequentially switching the engaging portion engaged by the hook portion to one having a different height position. One of them moves up and down.

When the hook portion is in the disengaged state for switching the engagement portion, the hook portion does not support the door, but this opening and closing device has hook portions on both left and right sides of the water channel. Therefore, for example, when the right hook portion is in the detached state, the left hook portion can be engaged to support the door at a predetermined height position.

In addition to the hooks attached to the telescopic arms, there is provided means for maintaining the height of the door at a predetermined height, whereby the door is provided when the hooks are in the detached state. In this case, the hook portions on the left and right sides can be simultaneously disengaged, and the engaging portions to be engaged can be switched.

As a more desirable configuration, there can be mentioned a configuration in which two hooks are attached to the other on each of the left and right sides of the water channel (claim 2).

With this configuration, when one of the two hooks attached to the left and right sides of the water channel is in a detached state, the door is supported by the other hook. Therefore, the door body can be always supported on the left and right sides of the water channel, and the door body can be stabilized during the elevating operation.

Further, according to such a configuration, when one hook portion is in the detached state, the telescopic arm portion to which the other hook portion is attached is extended and retracted, thereby raising and lowering the door body. Can do
The speed of raising and lowering the door body can be increased.

Further, when the engaging portion engaged with the hook portion is switched to an engaging portion adjacent on the upper side or the lower side, the extensible arm portion of the hook portion is caused to extend and contract.
At the same time, by extending and retracting the telescopic arm of the other hook, the hook for switching this engaging part is
The hooks can be switched also with respect to the engaging portions provided at a height twice as long as the telescopic stroke of each telescopic arm, and the hooks can be engaged with the engaging portions having a predetermined height. Increase the amount of vertical movement of the door in the state where
It is possible to reduce the number of times of switching the hook portion, and to speed up and lower the door body.

In one of the above, two rows of the plurality of engaging portions are provided on each of the left and right sides of the water channel, and two rows of the engaging portions provided on the same side of the water channel are provided in the height direction. It is desirable to be arranged alternately (claim 3).

When one of the two hooks and the telescopic arm provided on the same side of the water channel is engaged with an engaging part, the two telescopic arms on the same side are engaged. By driving the two telescopic arms together, the other hook part can move up and down by a height corresponding to the sum of the telescopic strokes of these two telescopic arm parts. Therefore, if the two rows of the engaging portions provided on the same side of the water channel are arranged alternately, the mounting height interval of the engaging portions belonging to the same row is set to twice the telescopic stroke of the telescopic arm portion, Attach two sets of hooks and telescopic arms provided on the same side of the water channel at the same height position, while keeping one of these two hooks always in the engaged state with the engaging portion, The engaging portion to be engaged can be switched.

[0019]

FIG. 1 is a front view of a first embodiment of a water gate opening / closing device according to the present invention.

As shown in this figure, the opening / closing device for the water gate opens and closes the waterway 90 by the door body 10 operating vertically between the pillars 40 provided on both sides of the waterway 90. This is for adjusting the flow rate and level of the water in the water channel 90, and does not have the upper structure 61 as in the conventional gate opening / closing device shown in FIG. It has.

FIG. 2 shows the switchgear of the floodgate in FIG.
It is the front view seen in the -II direction.

As shown in this figure, a plurality of engaging projections (engaging portions) 50 projecting toward the inside of the water channel 90 are provided on the pillars 40 on both sides of the water channel 90 at predetermined height intervals L. Hook portions 30 that engage with the engagement protrusions 50 are attached to the left and right sides of the door body 10 via telescopic arm portions 20. The hook portion 30 and the telescopic arm portion 20 move the door 10 up and down with respect to the columns 40, 40 by a series of operations described later. These telescopic arms 20 are all
Are mounted at the same height.

Also, on the left and right sides of the door body 10, the pillars 4
The guide rollers 11 that guide the elevating operation of the door 10 between the upstream door stop 41 and the downstream door stop 41 by rotating while contacting the door stops 41, 41 of the 0, 40 are formed. Installed.

FIG. 3 shows the switchgear of the floodgate in FIG.
It is the top view seen in the I-III direction.

As shown in the figure, two rows of engaging projections 50 are provided on the left and right columns 40, 40 of the water channel 90, respectively, on the upstream side and the downstream side.

On the other hand, the door 10 also has two hook portions 30 on each of the left and right sides of the water channel 90 corresponding to the two rows of the engagement projections 50 provided on the columns 40, 40. It is attached via an arm 20.

FIG. 4 is a side view of the column 40 viewed in the direction of line IV-IV in FIG.

As shown in this figure, the engaging projections 50 formed on the column 40 are arranged at a predetermined height interval L, and each of the engaging projections 50 belongs to the upstream row. On the other hand, each of the downstream engaging projections 5
Are arranged, and the upstream and downstream engaging projections 50 are alternately arranged in the height direction.

On the other hand, the door 10 shown by the broken line
A hook portion 30 that engages with the engagement protrusions 50 on the upstream side of the
2 with the hook portion 30 which engages with the downstream engagement protrusions 50.
One is attached to one side. That is, a total of four hook portions 30 are attached to the left and right sides of the door body 10. In addition, four guide rollers 11 are attached to the upper and lower portions of the door body 10 so as to abut against the door stop portions 41, 41 on the upstream side and the downstream side of the column body 40.

FIG. 5 shows the hook 30 and the telescopic arm 20.

As shown in FIG.
Is provided with a telescopic cylinder 21 that expands and contracts vertically. The telescopic cylinder 21 has a lower head portion 2.
2 is fixedly attached to the door body 10 with two pins via an arm support member 12 attached near the upper end of the side surface of the door body 10 and an attachment member 13 extending upward from the upper surface thereof. The hook body 31 of the hook 30 is rotatably attached to the rod 23 on the upper side of the telescopic cylinder 21 by a pin 34. As described above, the hook portion 30 is attached to the door body 10 via the telescopic cylinder 21 so that the telescopic cylinder 21
By the expansion and contraction operation of, the door body 10 is vertically moved relative to the door body 10.

A projection 33 is provided on the hook main body 31 of the hook portion 30, and the projection 33 extends and contracts with the hook cylinder support 24 provided on the rod 23 of the telescopic cylinder 21. They are connected via a hook cylinder 32. As described above, the hook body 31 is coupled to the rod portion 23 of the telescopic cylinder 21 via the hook cylinder 32 while being rotatably supported via the pin 34, so that the hook cylinder 32 is By performing the expansion and contraction operation, it is possible to switch between an engagement state shown by a solid line in the figure and a disengagement state released from the engagement shown by a two-dot chain line in FIG. ing.

The hook cylinder 32 and the telescopic cylinder 21 for operating the hook part 30 and the telescopic arm part 20 can be constituted by, for example, hydraulic cylinders. However, these may be drive sources capable of performing predetermined operations. For example, any known drive source such as a drive source driven electrically or a drive source operated by an internal combustion engine can be employed.

FIG. 6 shows the extension / contraction operation of the extension / contraction arm section 20.

In this figure, the solid line indicates the telescopic cylinder 21.
Are shown, and the two-dot chain line shows the state where the telescopic cylinder 21 is extended. As described above, since the hook portion 30 is attached to the rod portion 23 of the telescopic cylinder 21 via the pin 34 and the hook cylinder 32, the engagement state and the disengagement state are switched by the telescopic operation of the telescopic cylinder 21. Without moving up and down with respect to the door body 10.

The stroke of the elevating operation (extension / contraction stroke of the telescopic cylinder 21) is half the mounting height interval L of the engaging projections (engaging portions) 50... L / 2.

Next, the procedure of the raising and lowering operation (opening / closing operation of the water gate) of the door body 10 by the operation of the hook portion 30 and the telescopic arm portion 20 will be described.

FIG. 7 shows the sequence of this series of operations.

This figure shows (a) → (b) → (c) →
Ascending operation of the door body 10 (opening operation of the water gate) in the order of (d).
Is shown. Hereinafter, each step of the ascending operation will be described. The lowering operation (closing operation of the water gate) of the door body is performed by reversely performing the ascending operation described below in the order of FIG. 7 (d) → (c) → (b) → (a).

FIG. 7 (a) shows that the hook cylinders 32, 32 of the hook portions 30, 30 on the upstream side (front side in the figure) and on the downstream side (rear side in the figure) extend, and the hook main bodies 31, 31 are extended. The state where it engaged with the engagement protrusion 50 ... of the pillar 40 is shown. At this time, the upstream telescopic cylinder 21 is contracted, the hook main body 31 is in engagement with the engagement projection A, the downstream telescopic cylinder 21 is extended, and the hook main body 31 is in engagement with the engagement projection B. . The door body 10 is supported at the height position by these engagements.

FIG. 7B shows a state in which the upstream hook cylinder 32 has contracted from the state shown in FIG. 7A and the upstream hook portion 30 has been released. In addition, the hook part 30 on the downstream side maintains the engagement state with the engagement protrusion B, and the door body 10 is supported by this engagement.

FIG. 7 (c) shows a state in which the telescopic cylinder 31 on the downstream side to which the hook portion 30 which is in engagement with the engagement projection B of the column 40 is attached is contracted from the state shown in FIG. 7 (b). Thus, it is shown that the door body 10 has been moved up by the extension stroke L / 2. On the other hand, at this time, the telescopic cylinder 21 on the upstream side is extending. Thus, the upstream hook portion 30 has a height L corresponding to the sum of the extension operation of the upstream telescopic cylinder 21 and the rise of the door body 10 due to the contraction operation of the downstream telescopic cylinder 21. The position has risen and is located in front of the engagement protrusion C.

FIG. 7D shows that the hook 30 on the upstream side, which has risen to the front of the engaging projection C from the state of FIG. Shows a state in which it is engaged with. At this time,
The door body 10 includes hook portions 30 and 30 on the upstream side and the downstream side.
Are supported by engaging with the engagement projections B and C of the columnar body 40, and the state is returned to the same state as that of FIG. 7A only by switching the upstream side and the downstream side.

The above is one cycle of the operation of raising the door body 10 by L / 2. The further ascent operation is performed by a series of operations in which the operations of the upstream hook portion 30 and the telescopic cylinder 20 described above and the operations of the downstream hook portion 30 and the telescopic cylinder 20 are interchanged.

The extension operation of the upstream telescopic cylinder 21 and the contraction operation of the downstream telescopic cylinder 21 in FIGS. 7B to 7C do not have to be performed simultaneously.

As described above, according to the water gate opening / closing device, the water channel 90 is opened / closed by the engagement projections (engaging portions) 50 provided on the left and right sides of the water channel 90, the hook portion 30 and the telescopic arm 20. Since the door 10 is supported and moved up and down, a component for supporting the door 10 at a position above the water channel 90 is not required. Therefore, it is possible to configure the floodgate compactly in the height direction and prevent the scenery from being damaged. In addition, since the pillars 40 and 40 are configured to be more compact than the conventional support frame body 60 of a general floodgate shown in FIG. 13, the construction cost of the floodgate is reduced, and the construction site is shortened by shortening the construction period. Management costs can be reduced.

As described above, at any stage of the elevating operation of the door body 10, at least one set of the engaging projections 50 and the hook portions 30 are always in the engaged state on both sides of the water channel 90, respectively. Since the door body 10 is supported by this engagement, a stable operation can be performed.

Next, a second embodiment of the water gate opening / closing device according to the present invention will be described.

In the first embodiment, the columns 40,
The engaging projections (engaging portions) 50... Are provided on the side 40 and the hooks 30 are mounted on the door 10 side. However, in the second embodiment, the hooks 35 are mounted on the pillar side, Are provided on the side.

FIG. 8 is a front view of the water gate opening / closing device according to the second embodiment, with a portion cut away.

As shown in this figure, in this embodiment,
The door body 10 is provided with a plurality of engagement shaft portions (engagement portions) 55 having circular cross sections on both left and right sides thereof at predetermined intervals.

On the other hand, with the pillars 40, 40, the doors 10 are supported at predetermined heights by engaging with the engaging shafts 55 at any one of the height positions. A hook 35 for raising and lowering the 10 is attached via a telescopic arm 25 that expands and contracts.

The pillars 4 are provided on both left and right sides of the door 10.
Guide rollers 11 that slide in contact with the door stop portions 41, 41 and stably move the door body 10 up and down between the left and right pillars 40, 40 are attached.

FIG. 9 shows a perspective view of the door body 10 in this embodiment.

As shown in this figure, the door body 10 is formed with two rows of grooves 56 in the vertical direction on the side surface thereof. The engagement shaft portions 55 are formed by the two rows of groove portions 56, 56.
And each of the engagement shaft portions 55 belonging to one row, and each of the engagement shaft portions 55 belonging to the other row.
Are alternately mounted in the height direction such that their height positions are alternated.

FIG. 10 shows the hook 35 and the telescopic arm 25 attached to the pillars 40, 40.

As shown in this figure, the hook portion 35 and the extendable arm portion 25 are slightly different in the shape and the like of the hook body 36 and the mounting direction is upside down. Has the same configuration as that of the first embodiment shown in FIG.

That is, the telescopic arm 25 is moved away from the head 27 fixedly attached to the column 40 by the telescopic movement of the telescopic cylinder 26 and the rod 28 to which the hook 35 is connected via the pins 39 and the like. Expand and contract the interval,
The height position of the hook portion 35 with respect to the column 40 is varied.

The hook body 36 is provided with the telescopic arm 2.
5 is rotatably connected to the rod portion 28 by a pin 39, and is connected to the hook cylinder support portion 29 attached to the rod portion 28 via the hook cylinder 37 from the projection portion 38. With this connection form, the hook portion 35
By the expansion and contraction operation of the hook cylinder 37, it is possible to switch between an engagement state in which the engagement with the engagement shaft portions 55 of the door body 10 and a disengagement state in which the engagement is released.

The opening / closing device for a water gate constructed as described above operates in the same manner as in the first embodiment, with respect to a plurality of stages of engaging shafts (engaging portions) 55.
And the telescopic arm 25 operates, and the door 10 and the column 4
0 and 40 move relatively up and down. Thereby, the door body 10 moves up and down, and the opening and closing operation of the water gate is performed.

As described above, in the water gate opening / closing device according to the present invention, a plurality of engagement portions (engagement projections 50, engagement shaft portions 55, etc.), hook portions 30, 35 and telescopic arm portion 2 are provided.
The door 10 and the column 40,
, 55, and the hook portions 30, 3.
5. The telescopic arms 20 and 25 include the door 10 and the column 40,
40 can be provided on either side.

Although the water gate opening / closing device according to the present invention has been described based on the two embodiments, the present invention is not limited to the above-described embodiment. For example, the present invention may be configured as follows. Good.

(1) In the above embodiment, the waterway 90
Two sets of hook parts 30, 35 on the left and right sides of
And the telescopic arms 20, 25,
One side of the water channel 90 may be provided with only one set of hook portions 30, 35 and telescopic arm portions 20, 25. In this case, only one hook portion 30, 35 arranged on one side of the water channel 90 is engaged with the engaging portions 50, 55,.
For example, a guide roller 11 or the like is sufficiently arranged so that the door body 10 can be maintained at a predetermined height position only by engaging with the door 10 to prevent the door body 10 from being inclined obliquely. It is desirable.

(2) In the above embodiment, the waterway 90
The engaging portions (engaging protrusions 50 ..., engaging shaft portions 55)
..) Are provided in two rows each.
, 55 ... are arranged alternately in the height direction, but these two rows of engaging portions 50, 55 ... may be arranged at the same height position. Further, even when two sets of the hook parts 30, 35 and the telescopic arm parts 20, 25 are attached to one side of the water channel 90, the engagement parts 50,.
55 are formed so as to have a width that allows the two hook portions 30, 35 to be engaged simultaneously.
0 may be provided with only one row of engaging portions 50, 55,.

Even in such a case, the hook portions 30 and 35 and the telescopic arm portions 20 and 25 arranged on the same side of the water channel 90 are connected with the engaging heights L of the engaging portions 50. If the telescopic strokes of the telescopic arms 20 and 25 are set to L / 2 by displacing them in the height direction by half L / 2, it is possible to switch the engaging portions with which the hooks are engaged.

(3) In the above embodiment, the waterway 90
Sets of hooks 3 attached to each side
Although the 0 and 35 and the telescopic arms 20 and 25 are arranged side by side in the horizontal direction, these two sets of hooks 30 and 35 and the telescopic arms 20 and 25 may be arranged in the vertical direction (height direction). .

(4) In the above embodiment, the waterway 90
, 55, hooks 30, 35, and telescopic arms 20, 25 provided on both left and right sides of the door body 10, and the column 4 facing the door body 10 on both sides.
The engaging portions 50... 55, the hook portions 30 and 35, and the telescopic arm portions 20 and 25 are provided at positions near both right and left sides of the water channel 90. Hook 3 in any position
0, 35 may be mounted to operate.

For example, as shown in FIGS. 11 and 12,
The engaging portions 50 are provided on the door stop portions 41, 41 of the pillars 40, 40, respectively.
May be provided, and hook portions 30, 30 may be provided on the upstream side surface or the downstream side surface of the door body 10 facing the door portion. FIG.
In 1, 11 is a guide roller for stabilizing the door body 10.

(5) In the above embodiment, the door 10
Is raised to open the water channel 90, but on the contrary, the door body 10 is lowered and the water channel 9 is opened.
The water channel 90 may be configured to be in an open state by being evacuated to the bottom of the zero.

[0070]

As described above, according to the water gate opening / closing apparatus of the present invention, a plurality of engaging portions, hook portions, and a plurality of stages are provided on the left and right sides of the water channel in which the pillar and the door are adjacent to each other. The door body is raised and lowered by the operation mechanism consisting of the telescopic arm,
Since the opening and closing of the water channel is performed, it is not necessary to suspend and support a substantially central position of the door body from above, and the water gate opening / closing device can be configured to be compact in the height direction. Therefore, it is possible to prevent the scenery from being harmed, and it is possible to reduce the construction cost of the floodgate and shorten the construction period.

If two hooks are attached to each of the left and right sides of the water channel, one of the two hooks can be always engaged with the engaging portion. The door body is always supported from both left and right sides of the water channel, so that the operation of the door body can be stabilized.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a water gate opening / closing device according to the present invention.

FIG. 2 is a front view of the same device as viewed in a II-II direction.

FIG. 3 is a plan view of the same device in a III-III direction.

FIG. 4 is a side view of the same device as viewed in a direction IV-IV.

FIG. 5 is a perspective view showing a hook portion 30 and a telescopic arm portion 20.

FIG. 6 is a perspective view showing a telescopic operation of the telescopic arm unit 20.

FIG. 7 is an explanatory perspective view showing an opening / closing operation sequence of the door body 10;

FIG. 8 is a front view showing a second embodiment of the floodgate opening and closing device according to the present invention.

FIG. 9 is a perspective view showing the door body 10 of the embodiment.

FIG. 10 is a perspective view showing a hook and an arm attached to the column 40 of the embodiment.

11 is a plan view of a water gate opening / closing device in which engaging portions 50 are provided in a door stop 41 of a column 40. FIG.

FIG. 12 is a plan view of a water gate opening / closing device in which engaging portions 50 are provided on a door stop 41 of a column 40.

FIG. 13 is a perspective view showing a conventional floodgate opening / closing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Door body 20 Telescopic arm part 30 Hook part 40 Column 50 Engagement projection (engagement part) 90 Waterway

Claims (3)

[Claims] 1. A pillar provided on each of the left and right sides of a water channel, and a door body capable of blocking water flow on the water channel by moving up and down between the pillars to adjust the water flow rate, In a portion where the pillar and the door are adjacent on both the left and right sides of the waterway, one of the pillars and the door is engaged with the left and right sides of the waterway by a plurality of steps at predetermined height intervals. A hook portion capable of switching between an engaged state engaged with any one of the plurality of engaging portions and a disengaged state disengaged from the engaging portion, and a relative height position relative to the other. A water gate opening / closing device, wherein a telescopic arm portion for connecting the hook portion to the other of the hook portions while changing the angle is attached. 2. The opening / closing device for a water gate according to claim 1, wherein two hook portions are attached to the other of the water channel on each of the left and right sides of the water channel. 3. The one side, wherein the plurality of stages of the engaging portions are provided in two rows on each of the left and right sides of the water channel, and two rows of the engaging portions provided on the same side of the water channel are provided in the height direction. 3. The switchgear of a floodgate according to claim 2, wherein said switchgear is provided so as to be staggered.