JPH11181748A - Automatic flap gate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic flap gate which stably opens an outflow-side opening in a sluice box, without increasing the open angle of a door which opens and closes the outflow side opining, by using quadrupole-link-shaped constitution to support the door; automatically closes the outflow side opening when the level of water rises abnormally, as when water flows in from a main river; and is easy to maintain and control while requiring low constructing and running costs. SOLUTION: A mounting base 30 provided with a low bracket and a high bracket (imaginary fixed link) 35 to which the center part of a bell-crank-shaped oscillating link 40 having a door 44 and a balance weight 42 at both ends is attached at a shaft 32 is provided on the top of an outflow-side opening 20B in a sluice box 20. The bracket 33 at the top of the door 44 and the top of a high connecting piece 38A are attached at respective shafts 34, 39 to the ends of the oscillating links 40, 37, and the door 44 is supported using quadrupole-link-shaped support, so that normally the outflow side opening 208 is appropriately and stably opened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an automatic flap gate.
In particular, an openable / closable door is provided at the outlet side opening of the gutter tube box provided at the opening of the so-called carat at the end of the water channel, and the opening of the water channel is always appropriately adjusted. On the other hand, when the water level of the main river side rises abnormally, when the water level rises, the door body is pressed by the water pressure of the flowing water or the like, and the outlet at the end of the flowing water channel is automatically closed, and the main river side is closed. The present invention relates to an automatic flap gate for preventing flowing water or the like from flowing into a tributary side.

[0002]

2. Description of the Related Art Conventionally, an openable / closable door is provided at an outflow-side opening of a gutter tube box provided at an opening of a so-called vat at an end of a flowing water channel, and the door is always connected to the opening of the flowing water channel. On the other hand, when the water level of the Honkawa side rises abnormally, the door body is pressed by the water pressure of the running water whose level has risen, and the outlet at the end of the flowing water channel is automatically closed. Flap gate that prevents inflow of running water from the river to the tributary side
For example, there is the one shown in FIG.

[0003] The flap gate 5 is provided at an outlet side opening 1 of a gutter tube box 14 provided at an end of a water channel 15 on the tributary side 1.
The top of the door body 3 that opens and closes 4B is connected to the gutter tube box 14.
The door 3 is swingably supported on the horizontal shaft 4 at the top, and the outlet 3B of the gutter tube box 14 is always opened at a small angle. On the other hand, when the water level of the running water on the side of the main river 2 rises abnormally, the lower part of the back (left side in FIG. 9) of the door body 3 is pressed by the water pressure of the running water with the rising water level. The outlet side opening 14B of the gutter tube box 14 is closed, and the
The flow of the running water into the tributary side 1 is prevented.

The outer surface of the outlet side opening 14B of the gutter tube box 14 is provided on the flap gate 5 of this type in FIG.
2 to 3 ° from the vertical plane, as schematically indicated by a broken line 14BB in FIG.
In some cases, the upper part is configured to be inclined such that the upper part retreats from the main river side 2 to the tributary side 1. However, in FIG. 9, only the inclination direction of the outflow side opening 14B of the gutter tube box 14 is schematically shown, but the inclined end face 1 of the outflow side opening 14B is shown.
4BB is formed so that the top portion thereof coincides with the alternate long and short dash line 14B in FIG. 9 or the right side surface of the door body 3, and the suburb thereof enters the door body 3 in FIG. The right side surface of the door body 3 is disposed in the same inclined shape.

A conventional example of an automatic flap gate for opening and closing an opening 14B on the outflow side of a gutter box box 14 for flowing water from the tributary side 1 to the main river side 2 is shown in FIG. A water door 17 is also known (Jpn.
No. 1729).

The water control door 17 has a mounting member 18C rotatably attached to a shaft 18B on a horizontal shaft 18B above the outflow opening 14B of the gutter tube box 14 as a frame.
A substantially vertical door body 18 is provided below the horizontal mounting portion 18A of C.
And at the top of the mounting fixture 18C,
A balance weight 18D for urging the door body 18 on the main river side 2 as shown by a dashed line in FIG. 1 is provided so that the running water on the tributary side 1 can always flow out to the main river side 2. When the water level of the flowing water or the like on the main river side 2 rises abnormally, the rising water pressure causes the door body 18 to be pressed against the end face (the left side face in FIG. 10) of the outflow side opening 14B of the gutter tube box 14 and the outflow. The side opening 14B is automatically closed.

FIG. 11 is a schematic side view of a conventional slide gate 8. The slide gate 8 is provided at an outlet side opening 14B of a gutter box 14 provided at an end of a flowing water channel 15, and a lifting screw 7 is provided. The door body 6 which moves up and down by the rotation of is provided.
Although not shown, a roller gate having a substantially similar configuration is also known.

FIG. 12 is a schematic side view of a conventional radial gate 12. This radial gate 12 is provided at a gutter box box 14 at the end of a water channel 15 to open and close an outlet opening. 9 is provided so as to be rotatable around a horizontal axis 11.

[0009]

However, the outlet side opening 1 of the conventional gutter tube box 14 as shown in FIG.
For the flap gate 5 that opens and closes 4B, the tributary side 1
When the flowing water pressure from the tributary side 1 is large, the door body 3 can be opened by the flowing water pressure on the tributary side 1; It is necessary to rotate around the horizontal axis 4 and open it,
The rotation required considerable effort or power.

[0010] In addition, the water control door 17 shown in FIG.
In Japanese Patent Application Laid-Open No. 11729), the provision of the balance weight 18D on the fixture 18C allows the door 18 to be constantly opened from the outflow-side opening 14B of the gutter box box 14, while the abnormal water level on the main river side 2 As long as the water pressure effectively acts on the back surface of the door body 18 that is opened,
As long as the opening of the door body 18 is relatively small, it is possible to prevent inflow of running water from the main river side 2 into the tributary side 1, but if the door body 18 is excessively opened, The water pressure, such as flowing water, on the back side of the door body 18 (the left side in FIG. 10) with the rising water level on the Honkawa side 2 cannot be reliably applied, and the Honkawa from below the open door body 18 There is a possibility that running water on the side 2 may flow into the tributary side 1 through the outflow side opening 14B, and it is necessary to take some measures to prevent this.

In the slide gate 8 for opening and closing the outlet side opening 14B of the gutter tube box 14 shown in FIG. 11, the door 6 must be moved up and down in advance by a lifting screw 7, and FIG. In the radial gate 12 for opening and closing the outflow side opening 14B of the gutter tube box 14 as shown, not only a corresponding power is required to rotate the arcuate door 9 about the horizontal axis 11 in advance, but also the door is required. Body 6 or lonely door 9
In the state where the river is open, some measures such as raising and lowering to prevent the running water on the main river side 2 from inadvertently flowing into the tributary side 1 due to abnormal rise of the water level on the main river side 2 are taken. There was a need to prepare in advance.

In view of the above-mentioned problems in the prior art, the present invention is directed to providing an outflow-side opening 20B such as a gutter tube box 20 provided at the end of a flowing water channel 15 for flowing water from the tributary side 1 to the main river side 2. A door body 44 that opens and closes is provided at an end of a bell crank-shaped swing link 40 and an end of a rising arm portion 40B of the bell crank-shaped swing link 40, and has a bell crank shape. Around the horizontal support shaft 32 of the link 40, there is provided a balance weight 42 for balancing with the door body 44, a high connecting piece 38A extending upward from the top of the door body 44, and a high bracket 35 on the side of the gutter tube box 20 or the like. And the top part was connected by a swing link 37,
By supporting the door body 44 without excessive separation from the outflow side opening 20B by supporting with the four-node link-shaped support configuration, the water level of the running water on the main river side 2 rises abnormally temporarily. Also in this case, the present invention aims to provide an automatic flap gate that can automatically close the outflow side opening 20B by pressing the opened door body 44 by the water pressure of the rising running water or the like.

[0013]

SUMMARY OF THE INVENTION The present invention relates to a water channel
Left and right bell-crank-shaped swing links 40, 40 are provided on a horizontal shaft 32 provided at the top of a machine frame 20 or the like which requires an outlet at the end.
Is rotatably supported, and the bell crank-shaped swing link 4
The top of a door 43 that opens and closes the outlet at the end of the water channel 15 is attached to the shafts 34 and 34 at the ends of the channels 0 and 40, and the rising arm portions of the bell crank-shaped swing links 40 and 40. 4
0B, 40B, a balance weight 42 is provided around the horizontal axis 32 to balance the door body 44, and a high bracket 35 is provided at the center of the machine frame 20 or the like forming the outlet of the water channel 15. The other end of the swinging link 37 having one end attached to the top of the bracket 35 by the shaft 36 is connected to the top of the door 44 in a state where the outlet of the end of the water passage 15 is closed by the door 44. This is an automatic flap gate having a shaft 39 attached to the top of a connecting piece 38A extending substantially at the same height as the bracket 35.

The lower brackets 31 provided on the left and right sides above the outlet side opening 20B of the gutter tube box 20 provided at the end of the water channel 15 have the center of the bell crank-shaped swing links 40, 40 at the top. Axes 34 are attached to the left and right sides of the top of a door body 44 that opens and closes the outflow opening 20B of the gutter tube box 20 at the forward and downward ends of the bell crank-shaped swing links 40, 40. 34, and at the end of the rising arm portions 40B, 40B of the bell crank-shaped swing links 40, 40, a balance weight 42 is provided around the horizontal axis 32 to balance with the door body 44,
One end of a shaft 36 is attached to the top of a tall bracket 35 provided at the center of the top of the outflow opening 20B of the gutter tube box 20.
The other end of the oscillating link 7 is attached to the top of the connecting piece 38A extending substantially at the same height as the bracket 35 from the top of the door body 44 in the closed state of the outflow side opening 20B of the gutter tube box 20. The shaft 39 is attached.

Further, left and right lower brackets 31, 31 for pivotally supporting a central portion of the left and right bell crank-shaped swing links 40, 40 and a shaft 36 at one end of the swing link 37. A tall bracket 35 is provided on a mounting board 30 having substantially the same width as the machine frame 20 or the like constituting an outlet at the end of the water channel 15, and the right and left bell crank-shaped swing links are provided. At the ends of the rising arm portions 40B, 40B of the 40, 40, the door body 44 is provided around the horizontal axis 32, and the outflow side opening 20 of the gutter tube box 20 is provided.
A balance weight 42 is provided to urge B to be slightly opened at all times.

Further, the end face 20BC of the outflow side opening 20B of the gutter tube box 20 is formed in a slope shape which retreats at a small angle from the main stream side 2 to the tributary side 1 from the bottom to the top of the end face 20BC. The outlet 44B is closed by bringing the door body 44 into contact with the sloped end surface 20BC, and the bottom wall of the gutter tube box 20 provided at the end of the water channel 15 is provided. 23, a downward slope 21 facing the inflow side opening 20A from the inflow side opening 20A of the gutter tube box 20, and from the both sides or one side of the downward slope 21 to the other side, and the downward slope. It is formed in a concave shape converging forward and downward by the inclined flow surfaces 25, 25.

Further, an outflow side opening 20 of a machine frame or gutter tube box 20 constituting an outlet at the end of the water channel 15 is provided.
B, the left and right sides 44B, 4
The door plate 44 is provided with side plates 46, 46 which are separated from the door body 44 by a small distance M, M, and are approximately N in height, and end faces 47, 47 of the side plates 46, 46.
Is formed in a slanted shape which retreats from the main river side 2 to the tributary side 1 from the top toward the bottom.

[0018]

According to the first and second aspects of the present invention, the door 44 and the balance weight 42 provided on the bell-crank swing link 40 are balanced and stationary around the horizontal axis 32 because of the above-mentioned configuration. In addition, the upper and lower swing links 37 and 40, a high bracket (virtual fixed link) 35, and a connecting piece 38 as a virtual floating link 38D.
A and the like, the opening angle β of the door body 44 provided at the lower part of the connecting piece 38A can be changed by selecting the length of each link portion in the four-bar link support structure composed of
By opening the door body 44 at an opening angle smaller than the swing angle of the (arm part 40B), the door body 44 (virtual floating link 3) is opened.
8D), the degree of separation from the outflow side opening is reduced, and when the water level of the running water on the main river side 2 rises abnormally, the door body 44 is pressed against the outflow side opening 20B by the flowing water pressure. It is sealed and automatically prevents inflow of running water on the main river side into the tributary side 1.

According to the third aspect of the present invention, the central portions of the left and right bell-crank-shaped swing links are rotatable.
The lower left and right brackets 31, 2 and the higher bracket 35, which bears one end of the oscillating link 37 on the shaft 36, are mounted on a mounting board having substantially the same width as the outlet member 20 at the end of the water channel 15. With this configuration, the main part of the automatic flap gate can be manufactured as a substantially finished product in a factory where quality control is easy, and the mounting board 30 can be formed as an opening at the end of the flowing water channel. It can be easily arranged on the frame or the gutter tube box 20 installed at the same end. If the mounting board 30 is provided with a long hole in the length direction of the water channel 15, it is easy to adjust the contact between the door body 44 and the two end faces of the opening of the water channel 15 on the main river side, Consequently, workability such as assembly at the site is improved.

According to a fourth aspect of the present invention, the door body 44 is provided around the horizontal shaft 32 at the ends of the rear rising arm portions 40B, 40B of the bell crank-shaped swing links 40, 40, and the gutter pipe. If a balance weight 42 is provided to urge the outlet side opening 20B of the box 20 to always slightly open,
Due to the abnormal rise of the water level on the main river side 2, the door body 44 is automatically closed at the discharge side opening 20 B of the gutter tube box 20 while ensuring the outflow of the flowing water from the water channel 15 to the main river side 2. .

The end face 20BC of the outflow side opening 20B of the gutter tube box 20 is retreated at a small angle from the main stream side 2 to the tributary stream side from the bottom to the top of the end face 20BC. If the door body 44 is provided so as to abut the sloped side surface 20BC to close the outflow side opening 20B, the bell crank-shaped swing link 4
In addition to providing the balance weight 42 to the rising arm portion 40B of 0, the automatic closing property of the outlet side opening by the door body 44 based on the abnormal rise of the water level of the running water on the main river side 2 is ensured. Meanwhile, the outflow property of the tributary side 1 flowing water to the main river side 2 is improved.

According to the present invention, the bottom wall 23 of the gutter tube box 20 provided at the outlet at the end of the water channel 15 is moved from the inflow side port 20A to the outflow side port 20A of the gutter tube box 20.
B, and a downwardly inclined flow surface 2 which is inclined downward from both sides or one side to the other side.
If it is configured as a concave portion that converges forward and downward by 5 and 25, a small amount of flowing water flowing down the flow channel is focused and flows down in this gutter tube box 20, and the outflow side opening 20B of the gutter tube box 20 In particular, it promotes the outflow of sand, pebbles, and the like settling around the end of the main river side 2 to the main river side 2.

The right and left side surfaces 44B of the door body 44 are provided on both the left and right sides of the outflow side opening 20B of the machine frame or the gutter tube box 20 as the outflow constituent member at the end of the water channel 15. , 44B, a small distance M, M away from the door 4
If side plates 46, 46 having a height N substantially equal to 4 are provided,
Since the distance M between the side surfaces 44B, 44B of the door body 44 that opens and closes and the inner surfaces of the side plates 46, 46 can be set to be small, the entry of foreign matter and the like between them is restricted, and the water level of the Honkawa side 2 The outflow opening 2 of the gutter tube box 20 through the narrow space M, M between the two at the time of abnormal ascent.
Inflow to 0B is restricted, and tributary side 1 such as running water of main river side 2
The corresponding inflow to

According to an eighth aspect of the present invention, the side plate
If the end faces 47, 47 of 6, 46 are formed in an inclined shape retreating from the main river side 2 to the tributary side 1 from the top to the bottom, for example, the water level of the main river side 2 running water due to the occurrence of flooding, etc. Even if foreign matter such as driftwood mixed in the rising running water is trapped between the lower edge of the opened door body 44 and the side plates 46, 46, the side plates 46, 4
The slanted end surfaces 47 of 47 promote the fall of foreign substances such as driftwood to the lower side of the door body 44.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the automatic flap gate according to the present invention will be described below with reference to FIGS.
Parts common to those in the conventional example shown in FIGS. 9 to 11 have the same names and the same reference numerals.

FIG. 1 shows the tributary side 1 to the main river side 2 of the running water channel 15.
A main part of an automatic flap gate having a door 44 provided with a balance weight 42 in an openable and closable manner at an outlet side opening 20B of a tube box 20 installed at an end portion (ballart) 15 through which water flows down. FIG. 2 is a schematic front explanatory view, and FIG. 2 is a schematic front explanatory view. In FIG. 2, the attachment positions of the side plates 46, 46 to the outside of the side wall of the outflow side opening 20B of the gutter tube box 20 are schematically indicated by alternate long and short dash lines. Indicated.

FIG. 3 is a schematic perspective view of the gutter tube box 20 on which the automatic flap gate is mounted, as viewed from the outflow side opening 20B. FIG. 4 is a schematic front view of the gutter tube box 20, and FIG. Door body 44 of outflow side opening 20B of 20
The location of the side plates 46, 46 provided on the upper side and outside the side wall of the gutter tube box 20 is schematically indicated by a dashed line. FIG. 5 is a schematic perspective explanatory view of a mounting portion of the door body 44, and FIG. 6 is a schematic vertical sectional explanatory view taken along line BB of FIG.

FIG. 7 is a schematic side view of the four-bar link support structure of the door body 44. The four-bar link support structure includes a bell crank-shaped swing link 40 (A) (a rising arm section 40).
B), bracket 3 as virtual fixed link (B)
5, a connecting piece 38A in which the lower part of the swing link (C) 37 and the virtual floating link 38D is welded to the center of the top of the door body 44
It consists of. FIG. 8 shows the rising arm 40B of the bell-crank swing link 40 in the four-node link support structure of the door body 44 shown in FIG. From the closed state of
30 °, 60 °, 90 ° clockwise around horizontal axis 32
FIG. 4 is a schematic side view schematically showing the relevant positions of the respective parts in a rotated state.

1 to 8, reference numeral 1 denotes a tributary side of the flowing water channel 15, 2 denotes a main river side, 15 B denotes an opening at the end of the flowing water channel 15 (carbat), and 16 denotes a gutter pipe box 20. Fifteen
Metal fitting 27 for providing in the opening 15B at the end of
A mortar filling section for accommodating 27;
The watertight rubber 21 is formed so as to have a substantially P-shaped cross section, and is formed by air sealed in the P-shaped hole. It is configured to increase cushioning properties. The watertight rubber 21 can be attached to the entire periphery of the end face 20BC of the outflow side opening 20B of the gutter tube box 20, but the watertight rubber attached to the lower part of the end face 20BC of the outflow side opening 20B is hollow. It can be configured as a rubber plate without chamber.

Reference numeral 23 denotes an inner bottom surface of the gutter tube box 20;
4 is an inflow side opening 20 of the gutter tube box 20 on the bottom surface 23.
A, a downward slope toward the outflow side opening 20B from A, 25,
25 is a flowing water surface which inclines downward from both sides of the downwardly inclined surface 24 of the bottom surface 23 of the gutter tube box 20 toward the center thereof, and inclines downward toward the outflow side opening 20 side, The outflow-side opening 20B side of the bottom surface 23 is configured as a concave portion that converges in a forward-downward shape by the diagonal flow surfaces 24, 25, and 25.

The left and right downward flowing water surfaces 25, 2
5 is formed at the center (see FIG. 4) of the bottom surface of the outflow side opening 20B of the gutter tube box 20 in the left-right direction as shown in FIGS. Can,
In this case, the converged small amount of flowing water flows out of the concave portion formed by the flowing water surfaces 24, 25, 25 that are closer to the left or right.

Reference numeral 26 denotes an outflow side opening 20 of the gutter tube box 20.
B, which is an extension surface of the downward-slope flow surface 24 following the inner bottom surface 23, and which is formed on the outside thereof,
Causes the water flowing down the inclined surfaces 24, 25, 25 to flow smoothly to the main stream side 2.

Reference numeral 30 denotes a mounting board, and the left and right sides of the mounting board 30 are provided with the brackets 31, 31 serving as a four-bar link support structure of the door body 44, and a high bracket 35 is provided at the center thereof. Low bracket 3
Bell crank shaped swing links 40, 4
The central portion of the bracket 0 is pivotally mounted on a horizontal shaft 32, and the base of a high bracket 35 is pivotally mounted on the base of a rocking link 37 by a shaft 36. The ends of the bracket 37 and the tops of the low brackets 33, 33 and the high connecting piece 38A on the left and right sides of the top of the door body 44 are axially mounted by horizontal shafts 34, 34, and 39, respectively.

It is to be noted that reference numeral 41 denotes the Berg-shaped oscillating link 40.
The mounting position of the shaft 43 at the end of the balance weight 42 is changed from the mounting position of FIG. 5 to the adjusting hole 41 located on the upper side of FIG. 5 by adjusting holes provided in the rising arm portion 40B. The position to be balanced with the door body 44 attached to the forward and downward end of the berg-shaped swing link 40 is, for example,
It can be displaced to 44 ₂ to 44 ₃ shown in FIG.
However, without providing this adjusting hole 41, the length of the rising arm portion 40B of the bell crank-shaped swinging arm 40 is increased or the weight of the balance weight 42 is increased. The degree of opening of the stationary door body 44 can be widened, and in this case, the adjustment hole 41 can be omitted.

When the mounting board 30 is not provided,
Lower bracket 3 in said four-bar linkage configuration
1, 31 and the high bracket 35, for example,
At the top of the machine frame of the outlet or the top of the outflow side end 20B of the gutter tube box 20, which is formed in the five ends of the carat 15B,
The strength function of the mounting substrate 30 can be shared by directly fixing with mounting bolts or the like (not shown), that is, on the top of the machine frame or the top of the gutter tube box 20. The typical fixed joint (B) in the four-link type support structure has a lower bracket 31, 31 and a higher bracket 35, and a machine frame top or a frame 15B at the end of the water channel 15 to which they are attached. It is constituted by the outflow side opening 20B of the gutter tube box 20 installed in the same part.

Reference numerals 46, 46 denote side plates. The side plates 46, 46 vertically protrude toward the Honkawa side 1 from the left and right outer wall portions 20BB of the discharge side opening 20B of the trough tubular box 20. It is provided as follows. N is the height of the side plate 46, and the height N is preferably higher than the height of the door body 44 by more than K. 47, 47 are two end faces of the side plates 46, 46 on the Honkawa side.
Reference numerals 7 and 47 are formed as slopes whose bottoms recede from the main river side 2 to the tributary side 1 from the top. In addition, this end face 47
The side plate 46 shown in FIGS. 1 and 6 may be formed as a gently convex sloping surface inclined in the same direction as the end surface 47 of the side plate 46, but the operation is almost the same as that of the above-described embodiment.

Although not shown, the side plate 46 may be formed in a rectangular shape whose end face 47 is vertical. In this case also, the side plate 46,
Since a small space M between the end surfaces 46B and the side end surfaces 44B of the door body 44 can be ensured, the same operation as in the illustrated example is achieved.

[0038]

The flow of water flowing down the water channel 15 on the tributary side 1 is performed by the gutter tube box 2 installed at the end of the water channel 15.
0 from the inflow side opening 20A side to the outflow side opening 20B side, and flows out to the Honkawa side 2. On the other hand, when the water level of the running water on the Honkawa side 2 rises abnormally, the water pressure of the running water causes the door body 44 to move.
Pressing the back (left side in FIG. 1) of the gutter tube box 20
In the point that the outflow side opening 20B is closed, the operation is substantially the same as that of the conventional example of the same type.

In this embodiment, the door body 44 is supported by the above-described four-bar-link support structure having the balance weight 42, so that the door body 44 is moved to the position shown in FIG.
In the region where the opening angle β of the outflow opening 20B of the gutter tube box 20 from the closed state (the position of the solid line in FIGS. 7 and 8) gradually changes, the balance weight 42 and the door and body 44 is balanced, for example, to rest at 44 ₂ position of FIG.

[0040]

[Opening / closing action of the door by the four-bar link support structure] Here, the opening / closing action of the outlet side opening 20B of the gutter tube box 20 by the door body 44 supported by the four-bar link support structure in this embodiment will be described. This will be described with reference to 1, 2, 5 to 8.

First, the lengths and the like of the links (A) to (D) in the four-bar link support structure of this embodiment (see FIGS. 7 and 8) are set, for example, in the following dimensional relationships. . 7 and 8, B ₀ = L (the vertical interval between the horizontal axes 32 and 34: =
2L · sin γ) A ≒ 2.7L (Length of the forward descending part of the bell crank-shaped swing link 40: = space between the shafts 32 and 34) B ≒ 2L ｛Length of the bracket (virtual fixed link) 35: Shaft Distance between 32 and 36 {C} 2.5 L (length of swing link 37: shafts 36 and 3)
9 interval) D 3L connection piece 38A (virtual floating link 38D)
Length: The distance between the shafts 34 and 39｝ γ 先 The angle at which the forward descending portion of the bell crank-shaped swing link 40 descends from the horizontal plane

In FIG. 8, the rising arm portion 40B of the bell crank-shaped swinging link 40 is clockwise from the position of the thick solid line closing the outlet side opening 20B of the gutter tube box 20 when the door body 44 is in the vertical state. 30 °, 60 °, 90
In ° 40B ₂ ~ ₄ were rotated, the door body 44 _{2-44 4} and balance Ueito 42 _{2-42 4} to come to rest in the balance, the weight relationship and their horizontal balance weight 42 and the door 44 Although it is assumed that the distance relationship from the axis 32 is set, here, for simplicity of description, the description will be made assuming that each is configured to be stationary in a balance in the illustrated state. .

Incidentally, before falling portion 40 ₂₄ of the bell crank-shaped swing link 40, A - arm part 40B and the balance weight 42, 40 _{2-40 4,} 40 _2-4 and 42 _{2-42 4,}
The swing link 37 and the virtual floating link 38D (the connection piece 38)
A) to 37 ₂ to 37 ₄ and 38D ₂ ~38D _4, also, the door body 44, the shaft 39, the shaft 34 is 44 ₂ to 44 _4, 39 _{two or} three
9 _4, 34 ₂ to 34 ₄ respectively displaced to the stationary.

[0044] For example, when the door body 44 is still in the 44 ₂ position, if, when the water level of the main stream side 2 by flooding or the like is abnormally increased, Dotobiratai 44 ₂ of the rear side (left side in FIG. 8 ) Is pressed, and the end face 20BC of the outflow side opening 20B of the gutter tube box 20 is pressed tightly and automatically closed, and the flowing water such as the flood at the high river level on the Honkawa side 2 is inadvertently inadvertent. There is no danger of inflow to the tributary side 1 via.

[0045] Incidentally, the in the closed state of the outlet-side opening 20B by the door 44 A - the A for arm 440 ₁ -
Rotation angle at the position 40 _2, 40 _3, 40 ₄ of the arm portion 40, for example, 30 °, 60 °, can be set to 90 °, the closed state of the outlet-side opening 20B of the door body 44 in this case with respect to the position 44 ₁ at a position 44 _2, 44 _3, 44 _4, and the opening angle beta is beta ₁ for closed state of the outlet-side opening 20B of the door body 44 ₁ in this case Dotobiratai 44, beta _2, beta _In this embodiment, these open angles are β ₁ 111 °, β ₂ ≒ 26 °, and β ₃ ≒ 63.
° set.

As described above, the rising arm portion 40B
However, for example, the opening angle β of the door body 44 in the state of being displaced to 30 ° or 60 ° becomes β ₁ ≒ 11 ° or β ₂ ≒ 26 °, which are almost the same as the rotation angle of the arm portion 40. It is set to be about one third or one half. Thus, in these embodiments, even if increased abnormally water level of the flowing water, such as the main stream side 2, end surfaces of the outlet-side opening 20B of the door body 44 at position 44 ₂ or 44 ₃ by the flow pressure When the pressing force pressed by 20BB is applied to the door body 44,
For example, the open angles β ₂ and β ₃ are smaller than those in the conventional example (the door 18 in this example is rotated about the shaft 18B by the same angle as the fixture 18C) schematically shown in FIG. The position 44 ₂ , 44 _{3 in} FIG.
The outflow side opening 20B is tightly and securely sealed by the door body 44 located at the position shown in FIG.

The height H of the outflow opening 20B of the gutter tube box 20 depends on the bottom surface 23 of the gutter tube box 20.
And the downwardly inclined surface 2 facing the outlet side opening 20B.
In the case where 4, 25 and 25 are formed,
It is desirable to select the maximum height according to 25, 25 as its inner height H. In this case, the door body 44
Height K is preferably higher than the height H.

The balance weight 42 and the door 20 are connected to the arm 40 of the bell crank-shaped swing link 40.
B can also be set so that both are balanced in a state of being rotated clockwise by about 15 ° from the vertical state (not shown). In this case, the opening angle β of the door body 44 from the vertical state is about 5 ° and the height is 4
It becomes 4 of the 44 ₁ and a substantially intermediate position between the 44 _2, other effects such as is substantially the same as Example.

In this case, the stationary door body 44
Is about 5 °, which is quite close to vertical. Therefore, when the water level on the main river side 2 rises abnormally, the automatic closing property of the outlet side opening 20B by the door body 44 is further improved. When the amount of flowing water on the side of the flowing water channel 15 on the side 1 increases, the flowing water collides with the tributary side 1 of the door body 44. It is moved along the 44 _{2-44 4} trajectories of Figure 8 by forming, to flow out reasonably from the outlet 20B of the trough tube box 20.

When the two water levels on the main river side return to the normal position and the flow rate on the tributary side 1 returns to the normal level, the door body 44 and the balance weight 42 return to a normal position (design position) where the balance is achieved. Thereafter, the same operation as described above is performed. Note that, in this case, the gutter tube box 2 is placed in a state where the door body 20 is almost vertical.
Since the outflow-side opening 20B of the gutter tube box 20 is opened, the outflow-side opening 20B of the gutter box box 20 can be expected to be more reliably closed.

The position at which the door body 44 and the balance weight 42 of the automatic flap gate are balanced is a rising arm portion 40 of the bell crank-shaped swing link 40.
7 and 8 of FIG.
The angle can be set to any angle other than 0 ° and 90 °, but even if the angle is set to balance at any of those angles, the outflow side opening 2 of the gutter tube box 20 can be set.
From 0B, the flowing water in the flowing water channel 15 on the tributary side 1 flows out to the main river side 2 via the gutter tube box 20. In addition, when the water level of the flowing water on the main river side 2 rises abnormally, the rising flow The back surface of the door body 44 is pressed by water pressure, and the outlet side opening 20B of the gutter tube box 20 is automatically closed.

The bell crank-shaped swing link 40
Opening angle from the vertical surface of the door body 44 in a state where the arm portion 40B is rotated clockwise by about 60 °, that is,
The state at the inclination angle β ₂ ≒ 26 ° is, for example, 60 ° compared to the conventional example shown in FIG.
In contrast to this, the angle is set to a small angle of about 26 °, which is about half of that, so that the automatic closing action of the outlet side opening 20B of the gutter tube box 20 by the door body 44 is remarkably higher than that of the same conventional example. improves.

3 and 4, the bottom surface 23 of the gutter tube box 20 is directed downward toward the outflow side opening 20B of the gutter tube box 20, and a diagonal flow surface 24 which is lowered from a horizontal plane. And inclined downward toward the center thereof, and inclined toward the outflow side opening 20B of the gutter tube box 20.
By forming as 5, the part is configured as a concave part composed of the inclined flow surfaces 24, 25, 25 converging downward, and even when the amount of flowing water of the gutter tube box 20 is small,
The flow energy is collected by the converging portion formed by the inclined flow surfaces 24, 25, and 25, and the flow energy is converged.

Accordingly, for example, when a flood or the like occurs,
Assuming that the outflow side opening 20B of the gutter tube box 20 is on the Honkawa side 2
Even if sand, pebbles, etc. remain on the main flap gate 2, it can be discharged to the main stream side 2 by the converged water flow energy. It is possible to reduce the number of times of manual removal of foreign matters and the like generated around the outside of 20B, and to extend the period of maintenance and management for the removal.

In this embodiment, side plates 46, 46 provided outside the left and right side walls of the outflow side opening 20B of the gutter tube box 20 are provided, and the side plates 46, 46 are provided.
Since the distance M between the both side end faces 44B, 44B of the door body 44 is configured to be narrow, when the water level on the main river side 2 rises abnormally, etc., the space M passes through the outside of the both side end faces 44B, 44B of the door body 44. Therefore, the inflow resistance of flowing water flowing into the outflow side opening 20B of the gutter tube body 20 becomes large and the inflow thereof is restricted, and the amount of inflow of flowing water of the main river side 2 into the tributary side 1 at the time of abnormal ascent is That is suppressed.

The outflow side opening 20 of the gutter tube box 20
B, side plates 46, 46 provided on the outer sides 20BC, 20BC of the right and left side walls, and both side end surfaces 44B, 4B of the door body 44.
Since the interval L with respect to 4B is narrow, entry of the foreign matter or the like into the gutter tube box 20 from both side edges of the door body 44 from the interval M is prevented.

The end face 47 of the side plate 46 on the Honkawa side 2
Is formed from the upper side to the lower side in a downwardly narrow shape that retreats from the main river side 2 to the tributary side 1. In a state where the door body 44 is opened, the main river side 2 is temporarily set due to flooding or the like. The water level of the side plate 46 rises abnormally, and the narrowing of foreign matter such as driftwood mixed in running water between the door body 44 and the side plate 46 to be opened is prevented by the inclined end surface 47 of the side plate 46. The falling down of the door body 44 is promoted.

[0058]

[Modification 1] The dimensions of each of the link portions (A) to (D) forming the four-bar link support structure are changed to the door body 44.
Arm portion 40 of the bell crank-shaped swing link 40
In any state of balancing by the balance weight 42 provided at the end of B, the lower part of the door body 44 is lower than the top of the outflow side opening 20B of the gutter tube box 20,
For example, if the water level of the running water on the main river side 2 rises abnormally by setting the position as the 44 ₄ position in FIG. , The outflow side opening 20B of the gutter tube box 20 is automatically closed.

[0059]

[Modification 2] The door body 44 of the present invention is connected to the gutter tube box 20.
If it is configured to be able to ascend to a position higher than the outflow-side opening 20B, the door body 44 can be raised to a higher position, so that repair and management around the gutter tube box 20 can be performed more easily, but in such a state. In the case of abnormal water level rise such as running water on the main river side 2, the flood
In order to prevent the flowing water pressure at the rising water level from flowing into the tributary side 1 through the outflow side opening 20B of the gutter tube box 20, the door body 20 is lowered to make the outflow side opening 20B of the gutter tube box 20 into It is necessary to positively occlude by some means.

[0060]

[Modification 3] In the automatic flap gate of the present invention, not shown, the bell-crank swing links 40 are provided on the left and right sides of the gutter tube box 20 (see FIG. 3). A third bell crank-shaped link 40 (not shown) supported by a horizontal shaft concentric with the horizontal shaft 32 is rotatably provided at the central portion of the horizontal shafts 40, 40. A swing link 3 is provided at an intermediate portion of a bell crank-shaped swing link 40, 40 adjacent to the third bell-crank swing link 40 provided at the middle portion.
7 and 37 are arranged at the same height and their ends are connected to two sets of connecting pieces 38A and 38 whose lower ends are welded to the top of the door body 44.
The shafts 39, 39 are attached to the upper end of A, and the base side (the right side in FIG. 5) of the swing links 37, 37 is fixed at the lower end to the upper surface of the mounting board 30 by welding or the like. By attaching the shafts 36, 36 to the tops of two sets of high brackets 35, 35 arranged substantially at the same position (in the horizontal direction in the figure) as the 37, 37,
It can be configured as a four-bar-link-type support configuration with the two berglank-shaped links 40, 40, 40, two sets of connecting pieces 38A, 38A, swing links 37, 37, and brackets 35, 35.

In this case, the door body 44 is connected to three bell-crank links 40, 40, 40 and two sets of swing links 3
7 and 37, that is, since the supporting force of the door body 44 is dispersed and supported as compared with the above-described embodiment, the degree of freedom in designing a larger and larger automatic flap gate is improved.

The mounting positional relationship between the bell crank-shaped oscillating link 40 and the oscillating link 37 in the third modification can be arranged in a position opposite to that of the preceding example. In each of these cases, the left and right bell crank-shaped swing links 40,
The balance weights 42 provided at the ends of the arm portions 40B, 40B, 40B of the arm 40, 40 are supported by the same horizontal shaft 43, so that the bell crank-shaped swing link 40 of the automatic flap gate is moved to the left and right. Can be operated alone from either side.

[0063]

[Modification 4] This automatic flap gate door 44-4
Articulated support structure, in particular its brackets 31,3
1, 35, or the bracket 3 in the third modified example
1, 31, the length of the mounting board 30 to which the lower portions of the brackets 35, 35, 35 are to be welded, the length of the structure (the bottom) 15B of the running water channel 15 where the automatic flap gate is mounted, and the gutter box box 20 In addition to making it almost the same width as the width of
If the mounting board 30 is made slightly longer, the automatic flap gates having the same width of the mounting board 30 can be connected to the structure or the gutter tube box 20 at the end 15B of the flowing water channel 15 having a different width. Mounting becomes possible, and eventually, parts of the automatic flap gates of different sizes are made common, and the productivity is improved.

When the automatic flap gate is installed in the structure at the end 15 of the water channel 15 or in the outflow opening 20B of the gutter tube box 20 installed at the same end 15, the outflow of the gutter tube box 20 is performed. In order to easily adjust the contact between the end surface 20BC of the side opening 20B and the door body 44, the gutter tube box 20 is used.
It is preferable to form an elongate hole in the left-right direction (the length direction of the gutter tube box 20) in FIGS.

[0065]

Fifth Modification Further, at the ends of the rising arm portions 40B, 40B of the bell crank-shaped swing links 40, 40,
A plurality of mounting holes 41 for the balance weight 42 that is substantially balanced with the door body 44 are provided around the horizontal axis 32 so as to be slightly separated in the length direction thereof, so that the mounting position of the balance weight 42 can be adjusted. If the door 20
And the balance weight 42 can be adjusted, that is, the normal opening angle β of the discharge side opening 20B of the gutter tube box 50 of the door body 44 can be adjusted. It will be easier.

[0066]

(1) The top of the door body 44 is connected to the horizontal shaft 32 at the top of the machine frame or the like provided at the outlet at the end of the water channel 15 via the left and right bell crank-shaped swing links 40. 34, and the rising arm portion 40 of the swing link 40
At the end of B, a balance weight 42 is provided to substantially balance the door 44 around the horizontal axis 32. Therefore, the door 44 of the automatic flap gate may be provided with a hydraulic mechanism, a motor, or the like. It is always moderately open without
When the water level of running water on the main river side 2 rises abnormally, the door 20
Is automatically closed by the water pressure of flowing water or the like whose water level has risen.

(2) The other end of the swinging link 37 having one end attached to the top of a tall bracket 35 provided at the center of the machine frame 20 or the like forming the outlet of the water channel 15 is connected to the door body 4.
In the closed state of the outflow-side opening 20B of the machine frame 20 at the outlet of the water channel 15 due to the top 4, the top of the connecting piece 38A extending almost at the same height as the high bracket 35 upward from the top of the door body 44. Since the shaft 39 is mounted on the shaft 39, the rising arm portion 40 of the door body 44 and the bell crank-shaped swing link 40
From the rotation angle of B, the connecting piece 38 as the floating link (D)
A, therefore, the opening angle β from the closed state of the door body 44 becomes small. Therefore, if the water level of running water on the main river side 2 rises abnormally, the door body 44 in the open state rises in water level. Outflow side opening 22 of gutter tube box 20 due to the flowing water pressure
B is effectively pressed.

(3) Since the door body 44 of the automatic flap gate always stops at a position where the door body 44 is balanced with the balance weight 42, if the water level of the running water on the side of the main river 2 rises above the lower end of the door body 44, temporarily. For example, the back pressure (the left side in FIGS. 1, 6, and 8) of the door body 44 is pressed by the flowing water pressure on the main river side that has risen beyond the lower end of the door body 44, and
0 is automatically closed and the water level on the main river side 2 rises and there is no danger of inadvertent inflow of running water or the like to the tributary side 1. Therefore, maintenance and management of this automatic flap gate is extremely high. Easy to do.

(4) The rising arm portion 40B of the door body 44 of the automatic flap gate and the bell-crank swing link 40.
Since the balance weight provided in the automatic flap gate is balanced and there is no need to provide a drive device for opening and closing the door body 44 of the automatic flap gate, the installation cost and the running cost are significantly reduced as compared with the conventional example of the same type. .

(5) Bottom wall 23 of gutter tube box 20
From the inflow side opening 20A of the gutter tube box 20 toward the outflow side opening 20B.
If formed as 4, 25, 25, the running channel 1 on the tributary side 1
5 is converged in the same part and the flowing water energy is concentrated in the same part. For example, if the door 44 is closed due to the rise of the water level on the main river side 2 and the like, the gutter pipe is Even when some sand, pebbles, etc. settle down and stay around the outer side of the outflow side opening 20B of the box 20, they can be automatically discharged to the main river side 2.

(6) The automatic flap gate is provided at a gutter provided at a machine frame of an opening of the running water channel 15 of the tributary side 1 to the main river side 2 or at an opening of the same flowing water channel 15 to the main river side 2. Since it is provided at the top of the pipe box 20, the flowing water channel 15
As long as it is possible to secure the installation space for the door body 44 and the installation space for the four-bar link support structure for supporting the door body 44 so that it can be opened and closed, at the opening to the main river side 2 A comparatively simple structure change is applied to the outflow side opening 20B of the existing gutter tube box 20 and around the machine frame installed at the opening on the main river side 2 of the end portion 15B of the flowing water channel 15. It can be installed, and in this case, a device having substantially the same function as described above can be provided.

(7) The four doors 44 on the mounting board 30
If the node link-shaped support structure {the swing link 40 (A), the bracket 35 (fixed link B portion), the swing link 37 (C), the connecting piece 38 A (the floating link portion D)} is formed, the mounting substrate 30 Existing gutter pipe bracket 20 installed at the opening 15B at the end of the water channel 15 on the tributary side 1 for the purpose of
By mounting the mounting board 30 above the outflow-side opening of a structure or the like constituting the opening 15B, an automatic flap gate operating in the same manner as described above can be provided.

(8) Four-joint link portions (A) to (D) as the four-joint link support structure of the door body 44 or the door body 4
The four-group intermediate products such as the mounting board 30 having the four-bar-link support structures (A) to (D), the gutter tube box 20, and the embedding metal fittings 27 of the gutter tube box 20 were factory-produced. Since the automatic flap gate can be constructed only by assembling the automatic flap gate at the installation site of the automatic flap gate, for example, the mounting substrate 30 is configured to be slightly longer and the mounting and fixing holes thereof can be adjusted. The commonization of each part including the pre-forming of the eyes becomes easy, and the quality control by the factory production of the parts for each group can be improved, and as a result, the high-quality automatic flap gate. Can be provided at low cost.

(9) Outflow side opening 2 of gutter tube box 20
The side plates 46, 46 are provided on the outer side wall 20BB of the side plate 0B, and the gaps M, M between the inside of the side plates 46, 46 and the end surface 44B of the door body 44 are narrowed.
While ensuring the opening and closing of the door body 44, the distance M between them, M
Part, in particular, between the both end faces 44B, 44B of the opened door body 44 and the inner faces of the side plates 46, 46, the Honkawa side 2
Of the flowing water, etc., whose water level has risen, into the outflow-side opening 20B of the gutter tube box 20 is suppressed.
As compared with the case where the both end surfaces 44B, 44B of FIG.

(10) Side plates 46, 46 are provided on the outer side of the outflow side opening 20B of the gutter tube box 20, and the distance M between the side plates 46, 46 and the end surface 44B of the door body 44 is reduced. For example, when the water level on the main river side 2 rises abnormally, in particular, when the flood starts and passes, such as driftwood and other foreign substances mixed in the flowing water, the gutter pipe box 20 extends from the space M.
Is prevented from flowing into the outflow side opening 20B, so that the occurrence of failure of the automatic flap gate is reduced.

(11) The end faces 47, 47 on the Honkawa side 2 of the side plates 46, 46 are moved from the top to the bottom.
If it is configured so as to be inclined (lower and narrower) to recede from the main river side 2 to the tributary side 1, if foreign matter is to be narrowed between the side edge of the opened door body 44 and the side plate. Also, the fall of the door body 44 is promoted.

(12) Since the door body 44 is supported by the four-bar link support structure, the outlet side opening of the gutter tube box 20 can be achieved without increasing the opening angle β in the door body 44, especially in the small open state. The distance between the end face 20BC and the end face 20BC of the gutter tube box 20 is relatively large.
Since the distance between the door and the inner surface of the door body 20 can be opened so that the upper and lower portions thereof hardly change,
It is possible to provide a door 20 having a high automatic closing property based on an abnormal rise of running water or the like on the main river side 2 while ensuring the outflow property of the running water side 1.

[Brief description of the drawings]

FIG. 1 is a schematic vertical sectional view of a door support structure provided at an outflow-side opening of a pipe-covered box at an end of a flowing water channel in an embodiment of an automatic flap gate according to the present invention.

FIG. 2 is a schematic front explanatory view of an automatic flap gate according to the present invention.

FIG. 3 is a schematic perspective explanatory view of a gutter tube box on which the automatic flap gate according to the present invention is mounted, as viewed from an outflow side opening side.

FIG. 4 is a schematic front explanatory view of the gutter box box.

FIG. 5 is a schematic perspective explanatory view of a support structure of the door body.

FIG. 6 is a schematic longitudinal sectional view taken along the line BB of FIG. 2;

FIG. 7 shows an embodiment of the automatic flap gate according to the present invention;
FIG. 4 is a schematic side view of the four-bar link support structure of the door body in a state where the outlet side opening of the gutter box box is closed by the door body, showing one of the rising arms of the door body and the bell-crank swing link; The part is cut away and shown.

8 is a schematic operation explanatory view of a four-node link-shaped support structure of the door body schematically shown in FIG. 7, in which a part of the door body is cut away in a closed state of an outlet opening of a gutter tube box.

FIG. 9 is a schematic side view of a conventional flap gate.

FIG. 10 is a schematic side view of a water control door provided at an outflow side opening of a conventional gutter tube box.

FIG. 11 is a schematic side view illustrating a slide gate provided at an outflow side opening of a conventional gutter tube box and operated to move up and down through a screw structure.

FIG. 12 is a schematic side view of a radial gate provided at an opening of a conventional flowing water channel.

[Explanation of symbols]

1 ... Branch side 2 ... Honkawa side 3,6 ... Door body 4,11 ... Axis 5 ... Flap gate 7 ... Elevating screw 8 ... Slide gate (roller gate) 9 ... Arc door 12 Radial gate 14 Gutter box 14B Outflow-side opening 15 Flowing channel 15B End of flow channel 15 (carbat) 16 Mortar filling portion 17 Door Body 17B Shaft 18 Door 18A Mounting part 18B Shaft 18C Mounting fixture 18D Balance weight 20 Gutter box box 20A Inflow side opening of gutter box box 20B Gutter pipe Outflow side opening of box 20BB ... Side wall of outflow side opening of gutter tube box 20BC ... End face of outflow side opening of gutter tube box 21 ... Watertight rubber 23 ... Bottom surface of gutter tube box 24 ... Slant of gutter tube box Flow surface 25 …… Slope of gutter box box Surface 26: Mixed flow surface 27 Embedding bracket 30: Mounting board 31: Bracket (low in height) 32 ... Horizontal axis 33: Bracket (low in height) 34: Shaft (horizontal) 35 ... Bracket (high) 35A ... Hole in bracket 35 36 ... Shaft (horizontal) 37 ... Swing link (C) 38A ... Connecting piece 38B ... Notch 38D ... Virtual floating link (Shaft 34) And between axis 39:
D) 39: shaft (horizontal) 40: bell-crank swing link 40B: rising arm portion of bell-crank swing link 41: adjusting hole 42: balance weight 43: shaft (horizontal) 44: Door body 44B: Side end of door body 46: Side plate 47: Edge of side plate A: Length of swing link 40 B: Fixed link (with shafts 31 and 36) (Interval) C: length of swing link 37 D: length of virtual floating link 38A H: inner height of outlet side opening of gutter tube box 20 K: height of door body M: The distance between the side plate 46 and the side surface of the door body 44 N: the height of the side plate 46 α: the angle of the rising arm portion 40B β: the closed state of the outflow side opening 20B of the door body 44 Opening angle γ: The angle at which the swing link 40 descends from the horizontal line

Claims (8)

[Claims] 1. A left and right bell-crank swing links 40, 40 are rotatably supported on a horizontal shaft 32 provided at the top of a machine frame 20 or the like which requires an outlet at the end of the water channel 15. At the ends of the bell-crank swing links 40, 40, the top of a door 43 that opens and closes an outlet at the end of the water channel 15 is connected to a shaft 34,
34, and the bell crank-shaped swing link 40,
At the ends of the rising arm portions 40B, 40B, a balance weight 42 is provided around the horizontal axis 32 to balance the door body 44, and a machine frame 20 or the like constituting an outlet of the water channel 15 is provided. The bracket 35 is provided with a high bracket 35 at the center thereof, and the other end of the swing link 37 having one end attached to the top of the bracket 35 by the shaft 36 is connected to the water passage 1 by the door body 44.
An automatic flap gate characterized in that a shaft 39 is attached to the top of a connecting piece 38A extending substantially at the same height as the bracket 35 from the top of the door body 44 in the closed state of the outlet at the five ends. 2. The lower brackets 31 provided on the left and right sides of the upper part of the outflow opening 20B of the gutter tube box 20 provided at the end of the water channel 15 have the center of the bell crank-shaped swing links 40, 40. A door body 44 which is pivotally mounted on a horizontal shaft 32 and which opens and closes an outflow opening 20B of the gutter tube box 20 at the forward and downward ends of the bell crank-shaped swing links 40, 40.
The shafts 34, 34 are attached to both left and right sides of the top portion, and the rising rising arm portions 40 of the bell crank-shaped swing links 40, 40 are provided.
B, 40B, at the ends, a balance weight 42 is provided to balance with the door body 44 around the horizontal axis 32, and the top of a high bracket 35 provided at the center of the top of the outlet side opening 20B of the gutter tube box 20. The other end of the oscillating link 7 having one end mounted on the shaft 36 is connected to the bracket 35 at a substantially equal height from the top of the door body 44 when the outflow side opening 20B of the gutter box box 20 is closed. An automatic flap gate, wherein a shaft 39 is attached to the top of a piece 38A. 3. The left and right bell crank-shaped swing links 4.
The lower left and right brackets 31, 31 rotatably supporting a shaft 32 at the center portion of 0, 40 and the higher bracket 35 supporting a shaft 36 at one end of the oscillating link 37 are connected to the flowing water channel 15.
3. The automatic flap gate according to claim 1, wherein said automatic flap gate is provided on a mounting board 30 having substantially the same width as a machine frame 20 constituting an outlet at an end of said flap. 4. The right and left bell crank-shaped swing links 4.
At the ends of the rising arm portions 40B, 40B of the 0, 40, the door body 44 is urged around the horizontal axis 32 so that the outflow side opening 20B of the gutter tube box 20 is always slightly opened. 4. The automatic flap gate according to claim 1, further comprising a balance weight. 5. The outflow opening 20 of the gutter tube box 20.
B end surface 20BC is formed in a slope shape which recedes at a small angle from the main river side 2 to the tributary side 1 from the bottom to the top of the end surface 20BC, and the door body 44 is attached to the slope end surface 20BC.
5. The automatic flap gate according to claim 1, wherein said automatic flap gate is brought into contact with a BC so as to close said outlet side opening 20B. 6. A bottom wall 23 of a gutter tube box 20 provided at an end of the water channel 15 is formed by a downwardly sloped flow surface 24 from the inflow side opening 20A of the gutter tube box 20 toward the outflow side opening 20B. 3. A concave shape which converges in a downwardly descending manner by the inclined surfaces 25, 25, which are inclined from both sides or from one side to the other side of the downwardly inclined surface 24, and are inclined downwardly. 5. The automatic flap gate according to 5. 7. A small distance M from the left and right side surfaces 44B, 44B of the door body 44 at the left and right sides of the outflow opening 20B of the machine frame or the gutter tube box 20 constituting the outlet at the end of the water channel 15. 7. The automatic flap gate according to claim 1, further comprising: side plates 46, 46 which are spaced apart from each other by M and have substantially the same height N as the door body 44. 8. End faces 47, 4 of side plates 46, 46 provided on the left and right sides of an outflow opening 20B of a machine frame or gutter tube box 20 constituting an outlet at the end of the water channel 15.
8. The automatic flap gate according to claim 7, wherein the slope is formed so as to retreat from the main stream side to the tributary stream side from the top toward the bottom.