JP2002038458A - Float type radial gate for fish way - Google Patents

Abstract

PROBLEM TO BE SOLVED: To vertically move the overflow part of a radial gate door body functioning as an overflow part of the partition side of a fish way without any motive power to follow the variation of the water level by attaching a float to a float structure or the radial gate door body and simplify the external apperance structure and prevent foreign materials from jamming therein. SOLUTION: A radial gate 1 is arranged in the upstream side of a partition wall 3 formed in a fish way 2. A radial gate door body 4 is shaped in a float structure vertically moving to follow the variation of the water level. A lower part water-tight device 5 effectuating water tightness between the radial gate door body 4 projecting upward from the top end 3a of the partition wall while vertically moving and the partition wall 3 is provided and further, a side water- tight device 6 effectuating water-tightness between both right and left side ends of the radial gate door body 4 projecting upward from the top end 3a of the partition wall while vertically moving and the fish way 2 is provided. A door body overflow part 4a functioning as the partition wall side overflow part is provided at the upper end side of the vertically moving radial gate door body 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique relating to a fishway provided in a place where fish cannot go back to a river or the like by a dam or the like installed in a river or the like, and more particularly, to a radial gate door having a float structure. Alternatively, a float is attached to the radial gate door body, and the door body overflow section of the radial gate door body that functions as a bulkhead side overflow section of the fishway follows the change in water level and moves up and down with no power, so that it is a float type radial for fishway. It is about the gate.

[0002]

2. Description of the Related Art Conventionally, a fishway is provided in a place where a fish cannot go back to a river or the like by a dam or the like installed in a river or the like so that the fish can go back to the river or the like. The fishway has a height difference between the upstream side and the downstream side, and a plurality of partition walls are formed at appropriate intervals in the flow direction of the fishway in order to maintain a water level for fish to go back. By the way, when the water level changes, in order to maintain the fishway function, it is necessary to move the top of the fishway bulkhead up and down in accordance with the water level change. As such an invention, for example, a "elevating type fishway gate" of JP-A-7-3755, a "fishway gate" of JP-A-7-3756,
Japanese Patent Application Laid-Open No. 8-170321 has filed an application such as "Fishway Gate Device".

[0003]

However, Japanese Patent Laid-Open No. 7-3755 discloses a "elevating fishway gate" and Japanese Patent Laid-Open No. 7-3755.
Since the “fishway gate” of 756 is an up-and-down type, there is a concern that foreign substances such as falling dust may be caught in the roller portions at both ends of the gate. Further, the "fishway gate device" of JP-A-8-170321 is of a radial gate type, but the structure is too complicated, for example, a float chamber is provided beside the fishway and connected to a door in the fishway, resulting in poor economic efficiency. . In addition, foreign matter such as dust flowing down is also likely to be caught.

[0004] In view of the above problems, the present invention has been made to solve the problems, and an object of the present invention is to make the radial gate door body a float structure or a radial gate door body. By attaching a float, the door overflow of the radial gate door, which functions as the bulkhead overflow of the fishway, moves up and down with no power following the water level change. An object of the present invention is to provide a fishway float type radial gate which can prevent biting of fish.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a radial gate is arranged upstream of a partition formed in a fishway, and a radial gate door is provided with a water level fluctuation. Float structure that moves up and down according to the, and a lower watertightness device that moves up and down to watertight the radial gate door body and the bulkhead that protrudes upward from the top of the bulkhead is provided, and moves up and down from the top of the bulkhead A side watertightness device is provided to seal water between the left and right ends of the protruding radial gate door and both side walls of the fishway, and a door overflow that functions as a partition wall overflow at the upper end of the vertically moving radial gate door. The water on the upstream side of the partition wall overflows from the door body overflow section of the radial gate door body that projects upward from the top end of the partition wall, and the door body overflow section that functions as the partition wall overflow section is placed on the upstream side of the partition wall. Up and down movement without power by following the water level fluctuation Consisting of means for.

According to a second aspect of the present invention, a radial gate is arranged upstream of a partition wall formed in a fishway, and the radial gate door body has a float structure which moves up and down according to a change in water level. Provide a lower watertightness device for watertightness between the radial gate door body projecting upward from the top of the bulkhead and the bulkhead, and moving up and down to the left and right ends of the radial gate door body projecting upward from the top of the bulkhead and the fishway. A side water-tight device is provided to keep water tight with both side walls, and a door overflow that functions as a bulkhead overflow in the width direction on the upper end side of the radial gate door that moves up and down, and a higher non-overflow of the door The float structure of the non-overflow part of the door body is made more buoyant than the float structure of the overflow part of the door body, and the radial gate door body projecting upward from the top end of the bulkhead is the upstream side of the bulkhead from the overflow part of the door body Water overflow, and the bulkhead side overflow section The door overflow section which function to follow the level change of the partition wall upstream consists of means for vertically moving without motive power.

According to a third aspect of the present invention, a radial gate is disposed upstream of a partition formed in a fishway, and a float that moves up and down in accordance with a change in water level is attached to the radial gate door, and the up and down movement is performed. Provide a lower watertightness device for watertightness between the radial gate door body projecting upward from the top of the bulkhead and the bulkhead, and moving up and down to the left and right ends of the radial gate door body projecting upward from the top of the bulkhead and the fishway. A side watertightness device is provided to maintain watertightness with both side walls, and a door overflow that functions as a bulkhead side overflow is provided at the upper end side of the radial gate door that moves up and down, and a radial projecting upward from the top of the bulkhead The water on the upstream side of the partition wall overflows from the door body overflow section of the gate door body, and the door body overflow section, which functions as the bulkhead side overflow section, moves up and down without power by following the water level fluctuation on the partition upstream side. Consisting of means.

Here, as a preferred embodiment of the first to third aspects, the rotating shaft of the radial gate is preferably arranged upstream of the radial gate door.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically based on embodiments of the invention shown in the drawings.

FIG. 1 is a side sectional view and FIG. 2 is a plan view.

In the drawing, a fishway float type radial gate 1 is installed on the upstream side of a partition wall 3 formed in a fishway 2 and turns up and down to move up and down.
In order to maintain the fishway function when the water level changes by making the door overflow section 4a at the upper end of the upper part function as a bulkhead side overflow section, the top of the bulkhead of the fishway 2 follows the fluctuation of the water level to maintain the fishway function. This serves substantially the same function as moving the overflow section 3a up and down.

The fishway float type radial gate 1 is composed of a radial gate door body 4 having a float structure, a lower watertight device 5, a side watertight device 6, a pillar 7, a rotating shaft 8, and the like. The fishway float type radial gate 1 is installed toward the downstream side of the fishway 2. That is, the radial gate door 4 is installed downstream of the rotation shaft 8.

The radial gate door 4 has a float structure that floats by buoyancy, for example, has a hollow airtight structure. The radial gate door body 4 having a float structure follows the fluctuation of the water level on the upstream side of the partition wall 3 of the fishway 2 and moves up and down without power by its buoyancy.

The radial gate door 4 having a float structure has, for example, an arc-shaped cross section. The radial gate door body 4 is arranged so as to cross the fishway 2, that is, at right angles to the direction of water flow in the fishway 2, and the radial gate door body 4 is arranged so that the arc-shaped convex side faces the upstream side of the fishway 2. Have been. The radial gate door body 4 having a float structure having a hollow airtight structure is made of a material having a strength capable of withstanding a certain water pressure.

A radial gate door body 4 having a float structure is disposed adjacent to the bulkhead 3 on the widened fishway 2 on the upstream side of the bulkhead 3 formed in the fishway 2, and is provided with a lower watertight device 5 and a side portion. The watertightness between the partition wall 3 and both side wall surfaces of the fishway 2 is achieved by the watertightness device 6.

At the upper end of the radial gate door 4 having a float structure, a door overflow 4a and a door non-overflow 4b are formed in the width direction, and the water level on the upstream side of the partition 3 fluctuates. When the radial gate door body 4 moves up and down with no power by its buoyancy, and the door body overflowing portion 4a at the upper end of the radial gate door body 4 that moves up and down moves up and down above the partition wall top end 3a. The door overflow 4a functions as a movable partition-side overflow.

That is, when the door overflowing portion 4a at the upper end of the vertically moving radial gate door 4 moves up and down above the partition wall top end 3a fixed to the fishway 2, the partition 3
Water on the upstream side of the door is the overflow of the door 4a of the radial gate 4
, The water on the upstream side of the partition wall 3 whose water level is lower than the height of the door overflow section 4a cannot flow out to the downstream side of the partition wall 3 and the door overflow section 4a Will function as a movable partition-side overflow section.

The door body overflow section 4a provided in the width direction of the upper end of the radial gate door body 4 that moves up and down and the door body non-overflow section 4b higher than this are, for example, the door body non-overflow section 4b. Is provided at the center portion, and door overflow portions 4a are provided on both left and right sides thereof. The reverse, that is, the door overflowing portion 4a may be provided at the center portion, and the door non-overflowing portions 4b may be provided on both left and right sides.

The float structure of the door non-overflow portion 4b is formed so that the buoyancy is larger than that of the door body overflow portion 4a. For this reason, the change in buoyancy with respect to the fluctuation of the draft increases, and the operability of the radial gate door body 4 having the float structure is improved.

For example, the thickness of the hollow portion inside the radial gate door body 4 in the vertical cross section of the door non-overflow portion 4b is equal to the thickness of the inside of the radial gate door body 4 in the vertical cross section of the door body overflow portion 4a. The buoyancy is larger than the thickness of the hollow portion, and a greater buoyancy acts on the door non-overflow portion 4b than on the door body overflow portion 4a.

The lower watertight device 5 and the side watertight device 6 allow the radial gate door 4 and the partition 3 and the radial gate door 4 to move upward when the overflow 4a of the door is higher than the top 3a of the partition. Watertight both sides of the fishway 2
It functions to prevent water leakage from portions other than the door overflow section 4a.

The lower watertight device 5 is mounted on the entire upper surface of the partition wall top end 3a in the width direction. The lower watertight device 5 has a distal end projecting from the partition top end 3a toward the upstream side, and the projecting distal end is formed on the outer surface of the radial gate door body 4 having an arc-shaped cross section and projecting upward from the partition top end 3a. It functions closely to prevent water leakage from this part.

For the lower watertight device 5, for example, watertight rubber having watertightness and elasticity is used. For example, the lower watertight device 5 made of watertight rubber has its upper surface side pressed by a mounting plate 5a, and is fixed to the entire upper surface of the partition wall top end 3a in the width direction by a bolt or the like (not shown).

The side watertight device 6 is mounted on the front side 2a of the widened stepped side wall 2a of the widened fishway 2 on the upstream side of the partition wall 3 so as to protrude toward the upstream side of the fishway 2. The left and right widening step wall surfaces 2a of the fishway 2 are formed in a concave arc shape toward the upstream side, and the left and right side watertight devices 6 are formed in a concave arc shape toward the upstream side. Along the stepped side wall front surface 2a, it is mounted in a concave arc shape toward the upstream side, and further mounted above the partition wall top end 3a.

The left and right side watertight devices 6 are arranged substantially in the same way as the trajectory of the radial gate door body 4 projecting upward from the partition wall top end 3a and rotating vertically in an arc shape. It protrudes upward from the partition top end 3a and closely contacts the outer surfaces on the left and right end sides of the radial gate door body 4 that rotates vertically in an arc shape, and functions to prevent water leakage from this portion.

For the side watertight device 6, for example, watertight rubber having watertightness and elasticity is used. The side watertight device 6 made of, for example, watertight rubber is fixed to a mounting plate 6a fixed on the front surface 2a of the wide step wall above the partition wall top end 3a by, for example, a bolt (not shown).

On the left and right sides of the arc-shaped concave surface of the radial gate door 4, straight pillars 7 extend toward the upstream side of the fishway 2. The left and right pillars 7 extend toward left and right rotation shafts 8 provided at the center of curvature of the arc-shaped door body 3, and their ends are connected to the left and right rotation shafts 8. .

In the drawing, since the left and right pillars 7 are attached from the radial gate door body 4 to the upstream side of the fishway 2, a tensile stress acts on the left and right pillars 7.
For this reason, the forward arrangement in which a compressive stress acts, that is,
In this case, the weight of the pillar members can be reduced as compared with a configuration in which the pillar is attached from the radial gate door body 4 to the downstream side of the fishway 2.

The rotating shaft 8 is a portion serving as a center of rotation of the fishway float type radial gate 1 which rotates vertically, and is installed on the upstream side of the partition 3 of the fishway 2 of the radial gate door 4. It is made of a material that can withstand a predetermined strength. The rotating shaft 8 is supported by a bearing 9 installed on the rear surface 2b of the widened step wall of the widened fishway 2 on the upstream side of the partition wall 3 so as to be rotatable around the vertical direction.

Next, the operation based on the configuration of the above embodiment of the present invention will be described below. When the water level on the upstream side of the partition wall 3 formed in the fishway 2 fluctuates, the radial gate door body 4 having a float structure in which buoyancy acts disposed on the upstream side of the partition wall 3 has a buoyancy effected by the fluctuation of the water level. It rotates up and down with the rotation shaft 8 as the center of rotation and moves up and down.

When the water level on the upstream side of the bulkhead 3 rises above the top 3a of the bulkhead, the radial gate door 4 having a float structure in which buoyancy acts acts, the overflow 4a of the door rises above the top 3a of the bulkhead. And get higher.

At this time, the distal end side of the lower watertight device 5 attached to the partition wall top end 3a is in close contact with the outer surface of the radial gate door body 4 which rises above the partition wall top end 3a and protrudes. Therefore, water leakage from the portion between the partition wall top end 3a and the radial gate door body 4 is prevented.

At the left and right ends of the outer surface of the radial gate door body 4 which rises above the partition wall top end 3a and protrudes, the front ends of the side watertight devices 6 attached to the front surfaces 2a of the left and right wide step walls are provided. The sides are in close contact. For this reason, the radial gate door body 4 which rises above the partition wall top end 3a and projects therefrom
Water is prevented from leaking from both left and right sides.

Thus, when the door body overflowing portion 4a of the radial gate door body 4 is higher than the partition top end 3a, the water from the height of the partition top end 3a is controlled by the lower watertight device 5 and the side watertight device 6. Leakage is prevented, and the water on the upstream side of the partition wall 3 overflows only from the door overflow section 4a, and overflows from the water level at the height of the partition wall top end 3a having a lower height. Never.

As described above, the door overflowing portion 4a of the radial gate door 4 which moves up and down by buoyancy functions as a partition wall overflowing portion. In addition, the door overflowing portion 4a functioning as the partition-side overflowing portion moves up and down without power following the water level fluctuation on the upstream side of the partitioning wall 3.

[Embodiment 2] FIG. 3 is a side sectional view and FIG. 4 is a plan view.

In the figure, a fishway float type radial gate 11 is installed on the upstream side of a partition 13 formed in the fishway 12 and is turned up and down to move up and down, and is a door at the upper end of a radial gate door body 14. The body overflowing portion 14a functions as a partition-side overflowing portion, and in the case where the water level changes, in order to maintain the fishway function, the overflowing portion of the bulkhead 13a of the fishway 12 follows the variation of the water level. Performs substantially the same function as moving up and down.

The float type radial gate 11 for the fishway is
Radial gate door 1 with float 14b attached
4, the lower watertight device 15, the side watertight device 16, the pillar 17, the rotating shaft 18, and the like. The fishway float type radial gate 11 is installed toward the downstream side of the fishway 12. That is, the radial gate door 14 is installed downstream of the rotation shaft 18.

The radial gate door 14 is composed of, for example, a skin plate having an arc-shaped cross section. The radial gate door body 14 is arranged so as to cross the fishway 12, that is, at right angles to the direction of water flow in the fishway 12, and the radial gate door body 14 is arranged such that the arc-shaped convex side faces the upstream side of the fishway 12. Have been. Radial gate door 14
Is made of a material having the strength to withstand a certain water pressure.

The radial gate door 14 is provided with a float 14b which floats by buoyancy. The radial gate door body 14 to which the float 14b is attached follows the fluctuation of the water level on the upstream side of the partition 13 of the fishway 12 and moves up and down without power by its buoyancy.

The float 14b is the radial gate door 1
4 is attached to the upper side inside the arc shape via a connecting rod 14c. The float 14b is attached to the radial gate door body 14 such that the upper end side is located higher than the door overflow section 4a. In the drawing, the float 1
4b has a cylindrical outer shape, and is mounted with the cylindrical shape placed sideways. The float 14b has a hollow airtight structure, for example.

The radial gate door 14 to which the float 14b is attached is disposed adjacent to the bulkhead 13 on the widened fishway 12 upstream of the bulkhead 13 formed in the fishway 12, and the lower watertight device 15 and Watertightness between the partition wall 13 and both side wall surfaces of the fishway 12 is achieved by the side watertightness device 16.

A door overflow section 14a is formed at the upper end of the radial gate door body 14. The radial overflow of the float 14b follows the fluctuation of the water level on the upstream side of the partition wall 13. When the gate door body 14 moves up and down, and the door body overflow part 14a at the upper end of the radial gate door body 14 that moves up and down moves up and down above the partition top end 13a, the door body overflow part 14a is moved by the movable partition wall. It will function as a side overflow.

That is, the radial gate door 14 which moves up and down
When the door overflowing portion 14a at the upper end of the upper wall moves up and down above the top end 13a of the partition wall fixed to the fishway 12, the water on the upstream side of the partition wall 13 passes over the door body of the radial gate door body 14. Since the water flows downstream beyond the flow part 14a and the water level is lower than the height of the door body overflow part 14a, the water on the upstream side of the partition wall 13 cannot flow out to the downstream side of the partition wall 13; The flow part 14a functions as a movable partition-side overflow part.

The lower watertight device 15 and the side watertight device 16
When the overflow portion 14a of the radial gate door body 14 to which the float 14b is attached is higher than the top end 13a of the bulkhead, watertightness between the radial gate door body 14 and both side walls of the bulkhead 13 and the fishway 12 is achieved. And a function of preventing water leakage from portions other than the door overflowing portion 14a.

The lower watertight device 15 is mounted on the entire upper surface of the partition wall top 13a in the width direction. Lower watertight device 15
The tip end side protrudes toward the upstream side from the partition top end 13a, and the protruding tip side is in close contact with the outer surface of the radial gate door body 14 having a circular arc cross section projecting upward from the partition top end 13a, It functions to prevent water leakage from this part.

For the lower watertight device 15, for example, watertight rubber having watertightness and elasticity is used. For example, the lower watertight device 15 made of watertight rubber has an upper surface side of the mounting plate 1.
5a, and is fixed to the entire upper surface of the partition wall top end 13a in the width direction by a bolt (not shown) or the like.

The side watertight device 16 is provided on the front side 12a of the left and right wide stepped side wall 12a of the widened fishway 12 on the upstream side of the partition wall 13.
It is attached so as to protrude toward the upstream side of the fishway 12. The left and right widening stepped side wall surfaces 12a of the fishway 12 are formed in a concave arc shape toward the upstream side, and the left and right side watertight devices 16 are formed in a concave arc shape toward the upstream side. Along the stepped side wall front surface 12a, it is attached in a concave arc shape toward the upstream side.
Mounted above.

The left and right side watertight devices 16 are arranged substantially in the same way as the trajectory of the radial gate door 14 which projects upward from the top end 13a of the partition wall and rotates vertically in an arc. The radial gate door body 14 protrudes upward from the partition wall top end 13a and rotates vertically in an arc shape, and is in close contact with the outer surfaces on the left and right end sides to prevent water leakage from this portion.

The side watertight device 16 is made of, for example, watertight rubber having watertightness and elasticity. The side watertight device 16 made of, for example, watertight rubber is fixed to a mounting plate 16a fixed on the front surface 12a of the wide step wall on the upper side of the top end 13a of the partition wall by a bolt (not shown).

On the left and right sides of the arcuate concave surface of the radial gate door body 14, straight pillars 17 extend toward the upstream side of the fishway 12 respectively. Each pillar 17 arranged on the left and right
Extends toward the left and right rotation shafts 18 provided at the center of curvature of the arc-shaped door body 13, and ends at the left and right rotation shafts 1.
8.

In the drawing, since the left and right pillars 17 are attached from the radial gate door body 14 toward the upstream side of the fishway 12, a tensile stress acts on the left and right pillars 17. For this reason, the weight of the pillar member can be reduced as compared with the forward arrangement in which a compressive stress acts, that is, the pillar 17 is attached from the radial gate door body 14 to the downstream side of the fishway 12.

The turning shaft 18 is a portion serving as the turning center of the fishway float type radial gate 11 which turns up and down, and is installed upstream of the partition 13 of the fishway 12 of the radial gate door 14. It is made of a material that can withstand a predetermined strength. The rotating shaft 18 is a bearing 19 installed on the rear surface 12 b of the widened step side wall of the widened fishway 12 on the upstream side of the partition 13.
Are rotatably supported around the vertical direction.

Next, the operation based on the configuration of the embodiment of the present invention will be described below. When the water level on the upstream side of the partition wall 13 formed in the fishway 12 fluctuates, the radial gate door body 14 to which the float 14b disposed on the upstream side of the partition wall 13 and acting on buoyancy acts is attached to the float 14b due to the fluctuation of the water level. Due to the acting buoyancy, it turns up and down around the turning shaft 18 as a turning center and moves up and down.

The water level on the upstream side of the partition 13 is the top 13a of the partition.
When the float 14b rises, the radial gate door body 14 in which buoyancy acts on the float 14b has its door body overflowing portion 14a ascending above the partition top end 13a to be higher.

At this time, on the outer surface of the radial gate door body 14 which rises above the partition top end 13a and protrudes,
The distal end side of the lower watertight device 15 attached to the partition wall top end 13a is in close contact. Therefore, water leakage from the portion between the partition wall top end 13a and the radial gate door body 14 is prevented.

Further, on both left and right sides of the outer surface of the radial gate door body 14 which rises above the partition wall top end 13a and protrudes, the side watertight devices 16 attached to the left and right wide step side walls 12a respectively. The tip side is in close contact. For this reason, water leakage from both left and right ends of the radial gate door body 14 that rises above the partition top end 13a and protrudes is prevented.

Accordingly, when the door body overflowing portion 14a of the radial gate door body 14 becomes higher than the partition top end 13a,
The lower watertight device 15 and the side watertight device 16 prevent water leakage from the height of the partition wall top end 13a, and water on the upstream side of the partition wall 13 flows only from the door body overflow section 14a. However, the water does not flow from the water level at the height of the partition wall top end 13a having a lower height.

In this way, the door body overflow 14a of the radial gate door 14 which moves up and down by buoyancy acting on the float 14b functions as a partition wall overflow. In addition, the door overflowing portion 14a functioning as the partition-side overflowing portion follows the water level fluctuation on the upstream side of the partitioning wall 13 and moves up and down without power.

The present invention is not limited to the above embodiment of the present invention, and it is needless to say that various modifications can be made without departing from the spirit of the present invention. For example, in the above embodiment, the case where the rotating shafts 8 and 18 are provided on the upstream side of the radial gate doors 4 and 14 has been described. It may be provided downstream of 4,14. In this case, a compressive stress acts on the pillars 7 and 17.
Further, in the lateral direction on the upper end side of the radial gate door body 14 of the second embodiment, similarly to the radial gate door body 4 of the first embodiment, a door non-overflow that is higher than the door overflow section 14a. The part may be provided partially. Further, the float radial gates 1 and 11 for the fishway according to the present invention may be provided on the partition walls 3 and 13 at the entrance of the fishway, or may be provided on the plurality of partition walls 3 and 13 in the fishway.

[0061]

As is apparent from the above description, according to the float radial gate for fishery according to the first aspect of the present invention, the radial gate is arranged on the upstream side of the partition wall formed in the fishway and the radial gate is provided. The door body has a float structure that moves up and down following the fluctuation of the water level, and a lower watertightness device that moves up and down to watertight the radial gate door body and the partition wall that protrudes upward from the top end of the partition wall is provided. A side watertightness device is provided to keep water tight between the left and right ends of the radial gate door body projecting upward from the top of the bulkhead and both side walls of the fishway, as a bulkhead side overflow at the upper end of the radial gate door body that moves up and down. By providing a functioning door overflow section, water on the upstream side of the bulkhead can overflow only from the door body overflow section of the radial gate door body that protrudes upward from the top end of the bulkhead. As a basin It can be moved up and down by the non-powered so as to follow the level change of the partition wall upstream by utilizing the buoyancy acting the door overflow section for ability to radial gate door body of the float structure. Further, when the radial gate door body having the float structure moves up and down, foreign matter such as dust does not bite into the lower watertight device and the side watertight device, and the external structure can be simplified.

According to the float type radial gate for fishway according to the second aspect of the present invention, the radial gate is disposed upstream of the partition wall formed in the fishway and the radial gate door follows the water level fluctuation. A radial structure that moves up and down to provide watertightness between the radial gate door and the partition wall that moves up and down and projects upward from the top end of the partition wall, and a radial that moves up and down and projects upward from the top end of the partition wall A side watertight device is provided to maintain watertightness between the left and right sides of the gate door and both side walls of the fishway, and the door overflows as a partition wall overflow in the width direction of the upper end of the radial gate door that moves up and down. Radial protruding upward from the top of the partition wall by providing a higher non-overflow part and a higher buoyancy of the float structure of the non-overflow part of the door Gate door The water on the upstream side of the partition wall can be allowed to overflow only from the door body overflow part.Moreover, the door body overflow part that functions as the partition wall overflow part utilizes buoyancy acting on the float structure radial gate door body. It is possible to move up and down without power by following the water level fluctuation on the upstream side of the partition wall. Further, when the radial gate door body having the float structure moves up and down, foreign matter such as dust does not bite into the lower watertight device and the side watertight device, and the external structure can be simplified. In addition, by increasing the buoyancy of the float structure of the non-overflow part of the door body compared to the float structure of the overflow part of the door body, the change in buoyancy against fluctuations in draft increases, and the radial structure with the float structure Operability of the gate door body can be improved.

According to the float type radial gate for fishway according to the third aspect of the present invention, the radial gate is arranged upstream of the partition wall formed in the fishway, and the radial gate door follows the water level fluctuation. A radial gate that protrudes upward from the top of the bulkhead by mounting a float that moves up and down, and a lower watertightness device that seals the partition with water, and that moves up and down and projects upward from the top of the bulkhead A side watertightness device is provided to maintain watertightness between the left and right ends of the gate door and both side walls of the fishway, and a door overflow that functions as a partition wall overflow is provided at the upper end of the radial gate door that moves up and down. This allows the water on the upstream side of the bulkhead to overflow only from the door body overflow portion of the radial gate door body projecting upward from the top end of the bulkhead, and furthermore, the door body overflow functioning as the bulkhead side overflow portion Radia By utilizing the buoyancy acting on the float attached to a gate door body to follow the level change of the partition wall upstream can be moved up and down by the non-powered by. Furthermore, when the radial gate door body to which the float is attached moves up and down, foreign matter such as dust does not bite into the lower watertight device and the side watertight device, and the external structure can be simplified.

When the rotary shaft of the radial gate is arranged on the upstream side of the radial gate door, a tensile stress acts on the pillar connecting the radial gate door and the rotary shaft. As a result, the weight of the pillar member can be reduced as compared with the forward arrangement in which a compressive stress acts.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing Embodiment 1 of the present invention.

FIG. 2 is a plan view showing Embodiment 1 of the present invention.

FIG. 3 is a side sectional view showing Embodiment 2 of the present invention.

FIG. 4 is a plan view showing an embodiment-2 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Float type radial gate for fishways 2 Fishway 2a Front of widening step side wall 2b Rear surface of widening stepside wall 3 Partition wall 3a Partition top 4 Radial gate door 4a Door overflow 4b Door non overflow 5 Lower watertight device 5a Mounting plate Reference Signs List 6 Side watertight device 6a Mounting plate 7 Pillar 8 Rotating shaft 9 Bearing 11 Float type radial gate for fishway 12 Fishway 12a Wide front of wide step wall 12b Front surface of wide step wall 13 Partition 13a Partition top 14 Radial gate door 14a Door body Overflow section 14b Float 14c Connecting rod 15 Lower watertight device 15a Mounting plate 16 Side watertight device 16a Mounting plate 17 Leg 18 Rotating shaft 19 Bearing

 ────────────────────────────────────────────────── ─── Continued on front page (72) Inventor Kiyotaka Koga 4541 Matsuyamacho, Uto-shi, Kumamoto Nishida Iron Works Co., Ltd. In-house F-term (reference) 2D019 CA12 EA03

Claims (4)

[Claims] 1. A radial gate is arranged upstream of a partition wall formed in a fishway, and a radial gate door body has a float structure that moves up and down according to a change in water level, and moves up and down from a top end of the partition wall. A watertight device is provided to maintain the watertightness between the radial gate door and the partition that protrudes from the upper and lower walls. A side watertight device is provided, and a door overflow that functions as a bulkhead side overflow is provided at the upper end of the radial gate door that moves up and down, and the door of the radial gate door that projects upward from the top end of the bulkhead. For the fishway, the water on the upstream side of the partition wall overflows from the flow section, and the door body overflow section, which functions as the overflow section on the partition side, moves up and down without power by following the water level fluctuation on the upstream side of the partition wall. Float type radial gate. 2. A radial gate is arranged upstream of a partition formed in a fishway, and a radial gate door body has a float structure which moves up and down in accordance with a change in water level. A watertight device is provided to maintain the watertightness between the radial gate door and the partition that protrudes from the upper and lower walls. A side watertight device is provided, and a door body overflowing part that functions as a partition wall overflowing part in the width direction on the upper end side of the radial gate door body that moves up and down and a door body nonoverflow part higher than this are provided, and the door body The float structure of the overflow section has greater buoyancy than the float structure of the door overflow section, and the water on the upstream side of the bulkhead overflows from the door overflow section of the radial gate door projecting upward from the top of the bulkhead, Door overflow that functions as a bulkhead overflow A floating radial gate for fishways, characterized in that the float is moved up and down without power by following the water level fluctuation on the upstream side of the partition wall. 3. A radial gate is arranged upstream of a partition wall formed in a fishway, and a float that moves up and down according to a change in water level is attached to the radial gate door body, and the float moves up and down from the top end of the partition wall. A watertight device is provided to maintain the watertightness between the radial gate door and the partition that protrudes from the upper and lower walls. A side watertight device is provided, and a door overflow that functions as a bulkhead side overflow is provided at the upper end of the radial gate door that moves up and down, and the door of the radial gate door that projects upward from the top end of the bulkhead. For the fishway, the water on the upstream side of the partition wall overflows from the flow section, and the door body overflow section, which functions as the overflow section on the partition side, moves up and down without power by following the water level fluctuation on the upstream side of the partition wall. Float type radial gate. 4. The float type radial gate for fishways according to claim 1, wherein the rotation axis of the radial gate is disposed upstream of the radial gate door.