JPH0280708A - Automatic check gate for adverse tide - Google Patents

Abstract

PURPOSE:To contrive reduction of labor for opening and shutting of a gate by making a float chamber provided at the side of a channel connected with the upstream water of a gate while making the inside of the float connected with the downstream water of the gate, and by making the gate go up and down being interlocked with the up-and-down movement of the float. CONSTITUTION:A gate 3 is slidably installed at the boundary between a drainage channel 1 and a sluice pipe 2 leading to the sea or the like. A float chamber 11 provided at the side of the channel is connected to the upstream water and a float 12 is connected to the downstream water. A main counterweight 5 and an auxiliary counterweight 20 are installed respectively to a chain 4 fixed to the gate 3 and to a main chain 15 fixed to the float 12, and the both are interlocked with shafts 6a and 16a. When the water level at the downstream side of the gate 3 rises, the inside of the float 12 is filled with water and the float 12 is lowered thereby, making the gate 3 close. When the water level at the upstream side of the gate 3 rises, the water level at the inside of the chamber 11 rises and the float 12 is elevated thereby, making the gate 3 open.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a gate used to drain water from a drainage canal, a river, etc. to the sea, a river, etc., and particularly to a gate for preventing back tide.

(Prior art) Conventional water gates are installed across drainage channels, etc.
The gate body of the water gate was operated either upward or downward by human power or power to achieve its purpose.

(Problem to be solved by the invention) The water gate has a water level on the side of the drainage channel, that is, an internal water level.
When the water level of rivers, etc., or the outside water level, is low, the water gates are opened to drain water, and when the outside water level is high, the water gates are closed to prevent backflow of seawater, etc. These operations make drainage most efficient. However, in the past, these operations were performed manually and required manpower, and in the event of sudden flooding at night, the floodgates could be forgotten to close, resulting in floods or floods. This causes backflow of outside water, which damages fields,
People's homes, etc. will suffer from flooding. Additionally, as the scale of the water gate increases, a power source such as electricity must be provided.

Therefore, the present invention is a book that detects the water level of the gate and the upper and lower water levels using a float in the float chamber and effectively and quickly opens or closes the gate.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a waterway (192) with a gate (3) slidable up and down, a float chamber (1) provided near the waterway, A float (12) is floated in the float chamber, the float chamber communicates with water upstream of the gate, the inside of the float communicates with water downstream of the gate, and the gate is connected to the vertical movement of the float. This structure is characterized in that it is provided so as to move up and down.

(Function) When the water level on the downstream side of gate (3) becomes higher than that on the upstream side, water is supplied into (flow) (12), so water in #i beeswath (11) flows. As it descends while discharging, the gate (3) connected to this descends and closes the gate.

When the water level on the upstream side of the gate (3) becomes higher than that on the downstream side, the water in the float is discharged and the float chamber (11
) becomes higher and 70 tons (12) rises, so the gate (5) rises and opens the gate.

(Example) Embodiments of the present invention will be described based on FIGS. 1 to 3.

A gate 3 is provided in a groove 1a provided at the boundary between a drainage channel 1 and a gutter pipe 2 leading to the sea, a river, etc., so as to be slidable up and down. The gate 3 is provided with kite rollers 3a on both side edges, and the kite rollers 3a are engaged with the fi grooves 1a. A shaft 6a is inserted across the drainage channel 1 between the pillars 6, 6 planted near the gate 3.
is rotatably suspended over the shaft, and a pair of driven sprockets 7.7 are fixed to the shaft 6a.

A pair of chains 4, 4 attached to the upper side of the gate 3 are wound around sprockets 7, 7, respectively, and a main counterweight 5 is attached to the free ends thereof.

A still water pond 9 provided along the drainage channel 1 is communicated with the drainage channel 1 upstream of the gate 3 through a water inlet 8 .

The water inlet 8 is bored near the bottom of the drainage channel.

In the still water pond 9, there is a float chamber 11 defined by an annular wall 10, and in the float chamber 11, there is a float 1.
2 is floating. Float chamber 11 and float 12
The distance between the two shall be as small as possible. The float chamber 11 and the still water pond 9 are communicated with each other by a small diameter water pipe 10a attached to the annular wall 10 near the bottom of the float chamber 11. The upper edge opens at approximately the same water level as the water inlet 8.

The float 12 is hollow as shown in FIG.
One end of the water conduit 13 is connected to the bottom of the drain pipe 13, and the other end is provided so as to penetrate through the annular wall 10 and open near the bottom of the gutter pipe 2. An air vent valve 14 is attached to the top of the float 12, and a 12 m weight is attached to the bottom. It's sato.

On the side wall of the still water pond 9 are a pair of supports 16, 16°17.1.
7 is planted, and shafts 16a and 17a are rotatably suspended between each support, and each shaft has a sprocket.
18.19 are fixedly installed. The shaft 6a and the shaft 16a are connected to rotate simultaneously.

On the top of the float 12, one end of a driving chain 15 is fixed, and an auxiliary counterweight 20 is suspended from the other end.
It is wound around 9.

The weight of the gate 3 is large enough to close it under its own weight, and the weight of the main counterweight 5 and the auxiliary counterweight 20 is such that the water level in the float 12 is large enough to close the gate under its own weight. It is determined that the water level is balanced with the float 12 and stands still in a relatively low state, and if the downstream of the gutter pipe 2 is in the ocean, the density and buoyancy of the seawater should be taken into account. When the downstream side of the gutter pipe 2 is a river, the water level difference is made as small as possible, but the water level difference is not completely eliminated.

Next, the effect will be explained.

The float 12 works so that the float 12 descends and the gate 3 closes before a backflow occurs, since the difference in water level between the inside and outside of the float is never completely eliminated. As the float 12 descends, water is supplied into the float 12 via the water pipe 13, and water in the float chamber 10 is discharged via the water pipe 11. The closing movement continues until the water level difference increases and reaches a predetermined value, and if there is no change in the water level difference between the upstream and downstream sides of the gate 3, the gate 3#'i becomes fully closed.

At this time, the resistance at the start of the movement is static frictional resistance and is sufficiently large, but the resistance after the movement starts becomes dynamic frictional resistance and becomes significantly smaller, so there is a risk that the gate 3 will move significantly. Since the side gaps are made as small as possible, if the float 12 suddenly descends, the water level in the float chamber will rise significantly and the operating force will be drastically reduced, preventing the gate 3 from working too hard all at once. There is. If the water level upstream of the gate 3 becomes thicker than that downstream, the float 12 will of course rise and the gate 3 will open, but it will also cause a flood, and the water level inside the gate, that is, the drainage channel 1@, will rise and the gutter will open. When the pipe 2 is full of water, the pressure head in the gutter pipe 2 will be lower than the water level in the drain channel 1 by the velocity head, so the gate 3 will be fully open and there will be no hindrance to drainage. . Additionally, if the downstream water level suddenly rises significantly while the gate is closed, the air vent valve closes to prevent seawater from entering.

(Effects) Since the present invention has the above configuration, the gate can be reliably closed depending on the water level downstream of the gate, and when the water level upstream of the gate reaches the water level difference required for drainage, the gate can be closed immediately. Since it opens and drains water, it does not require any manpower and is very convenient, and since the structure is not complicated, the construction cost is extremely low.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1, and FIG. 5 is for FIG. 9... Still water pond, 12... Float, sectional view taken along the line ■. 2...Gutter pipe, 5...Counterweight, 1...Float chamber, 3...Water pipe.

Claims (1)

[Claims] (1) A gate is provided in a waterway so as to be slidable up and down, a float chamber is provided near the waterway, a float is floated in the float chamber, the float chamber communicates with water upstream of the gate, and the inside of the float is An automatic backflow prevention gate, characterized in that the gate communicates with water downstream of the gate, and the gate is provided so as to move up and down in conjunction with the up and down movement of the float.