JP2002285533A - Non-power type gate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-power type gate capable of quickly and widely opening the gate even when a river or the like has the small flow and quickly closing when a backflow occurs. SOLUTION: For the non-power type gate providing a bearing shaft 12 of a gate body 10 to the vertical direction by inclining to an upstream side, an auxiliary load means 20 for applying load in the gate opening direction is provided to the gate body 10. The auxiliary load means 20 consecutively suspends a plurality of weights on a wire rope 22 fastened to the gate body 10 at a predetermined interval in the vertical direction, and it is so constituted that the weights are successively brought into contact with the ground from a lower position side with the widening of an opening of the gate. Weight or the like of the weight is so set that a moment Mo in the closing direction acts on the gate body 10 in an optional opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backflow prevention gutter for preventing seawater from flowing back into a river due to storm surge or the like, or to a non-powered gate used for a backflow prevention floodgate.

[0002]

2. Description of the Related Art Conventionally, as a non-powered gate used for a backflow prevention gutter or a backflow prevention floodgate for seawater to a river, for example, a gate body (door) has been used in a single-door type swing gate or a double-door type miter gate. The non-powered type in which the rotation shaft of (2) is provided slightly inclined (for example, about 2 to 3 degrees) upstream with respect to the vertical direction so that a moment in the gate closing direction due to its own weight always acts on the gate body. Gates are generally known.

According to this gate, when the tide is low, the gate is opened by the water flow of the river, the moment acting on the gate body by the water flow in the gate opening direction (hereinafter abbreviated as the opening direction), and the gate closing direction (hereinafter referred to as the self-weight). The gate is maintained at an opening corresponding to the flow rate of the river by balancing the moment of the closing direction.

When the water level on the sea side rises, for example, at high tide, and the closing moment acting on the gate body due to its water flow and its own weight becomes larger than the opening moment due to the river water flow, the gate body is closed. And the gate is fully closed, thereby preventing seawater from flowing backward. At this time, as described above, the gate is easily closed by the moment in the closing direction due to its own weight acting on the gate body. As a result, the gate closes promptly as the seawater level rises.

[0005]

Since the non-powered gate as described above is for preventing backflow of seawater in the first place, at the time of low tide or the like, the gate is opened widely to promote discharge of the river. It is desirable. However, in conventional non-powered gates, the support shaft of the gate body is inclined to make it easier to close the gate.For example, when the river has a very small flow rate, the moment in the closing direction acting on the gate body due to its own weight is reduced. The moment in the opening direction acting on the gate body due to the water flow in the river is balanced in the minute opening range of the gate, and it has been difficult to open the gate widely to a fully opened state or a state close to this.

Therefore, the applicant considers that a weight is hung on the gate body to apply a load in the gate opening direction to the gate body, thereby assisting the gate opening operation at a small flow rate. However, even if the gate can be fully opened simply by applying a constant load to the gate body, there is a problem that once the gate is fully opened, it is difficult to close the gate. That is, in the conventional non-powered gate, since the support shaft of the gate body is inclined, the larger the opening angle of the gate body (the larger the opening degree of the gate), the more the weight of the gate in the closing direction acting on the gate body by its own weight. It has the characteristic that the moment is small. for that reason,
When a gate is placed in a fully open state by applying a load capable of bringing a gate at a small opening into a fully opened state, the moment in the opening direction acting on the gate body due to the load is smaller than the moment in the closing direction acting on the gate body due to its own weight. There is a problem that the gate cannot be completely closed unless the flow velocity at the time of backflow is considerably high, for example, because the gate becomes large and the gate becomes difficult to close. Therefore, it is necessary to solve this.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to quickly and widely open a gate even when a river or the like (upstream side) has a very small flow rate, while preventing a reverse flow. It is an object of the present invention to provide a responsive non-powered gate that can quickly close the gate when it occurs.

[0008]

In order to solve the above-mentioned problems, the present invention provides a gate main body for opening and closing a gate, the support shaft of which is provided to be inclined upstream with respect to a vertical direction. In the non-powered gate configured to apply a moment in the gate closing direction due to its own weight, an auxiliary load means for applying a load to the gate body in the gate opening direction is provided. This auxiliary load means is configured to reduce the load as the opening degree of the gate increases, and the moment in the gate closing direction is applied to the gate body over the entire opening range from the gate closed state to the gate fully opened state. It is configured to work.

According to such a non-powered gate, since the load is applied in the gate opening direction by the auxiliary load means, the gate is easily opened. Therefore, even if the flow rate on the upstream side is very small, the gate can be opened widely. In addition, since the load is applied so that the moment in the gate closing direction is acting on the gate body at all the opening degrees of the gate, even after the gate is once widely opened, the gate is quickly opened when a backflow occurs. Can be closed. Moreover, since the auxiliary load means is configured to reduce the load as the opening of the gate increases, the moment in the closing direction due to its own weight decreases as the opening of the gate increases. The characteristics are balanced, and as a result, the gate opening / closing operation is performed with high responsiveness in accordance with the fluctuation of the flow rate.

[0010] As a specific example of the auxiliary load means, a plurality of weights are continuously hung vertically at predetermined intervals, and the weights are sequentially grounded from the lower side as the opening of the gate increases. be able to.

According to the structure of the auxiliary load means, the load can be changed as described above with a simple structure. It should be noted that, in the description of the second aspect, "the weight is in contact with the ground" does not require that the weight actually touches the ground. In short, the weight is placed in a state where no load is applied to the gate body. It is meant to be.

In this non-powered gate, the auxiliary load means is configured so that a moment having a substantially constant magnitude acts on the gate body in the entire opening range from the gate closed state to the gate fully opened state. Is preferred.

According to this, the opening operation performance (easiness of opening) or the closing operation performance (easiness of closing) of the gate becomes substantially constant irrespective of the opening degree of the gate, and as a result, the responsiveness due to the difference in the opening degree Can be reduced.

Furthermore, in this non-powered gate,
It is more preferable that the moment of the certain magnitude is set to be smaller than a moment in the gate closing direction which acts on the gate body only by its own weight when the gate is fully opened.

According to this configuration, the gate can be opened more widely even when the flow rate on the upstream side of the gate is small. In addition, in the description of claim 4, "only by own weight"
Means "the state where the load by the auxiliary load means is omitted".

[0016]

Embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 schematically show a non-powered gate (hereinafter abbreviated as gate) according to the present invention. As shown in these figures, the gate is a gate-type gate provided with a pair of gate bodies 10 called a so-called miter gate, and a waterway 1 leading to a river or the like as a seawater backflow prevention gate.
It is provided in.

Each gate body 10 is rotatably supported by a recess 2a formed on each side wall of the water channel 1 via a support shaft 12, and as shown by a solid line in FIG.
Are in a closed position where the leading ends of the abutments abut each other in the width direction of the water channel to bring the water channel 1 into a fully closed state, and as shown in a two-dot chain line in FIG. Each can be displaced over the open position to be set.

As shown in FIG. 2, a projection 3a is formed on the bottom wall 3 of the water channel 1 on the upstream side of the gate so as to extend in the width direction of the water channel.
The lower edge of the abutment 0 abuts on the projection 3a so that the corresponding contact portion is sealed. Also, in each recess 2a,
Each of the gate bodies 10 is provided with a buffer member 34.
The gate body 10 is configured to be elastically received by the cushioning members 34 when the gate body 10 is displaced to the open position.

The support shaft 12 of each gate body 10 is inclined at a predetermined angle θ toward the upstream of the water channel with respect to the vertical direction, as shown in FIG. It is set to ~ 3 °. To do this the gate body 10, always the gate closing direction of the moment due to the weight, that is, the direction of the moment indicated by symbol M ₀ in the direction of the moment (FIG. 1 for displacing the gate body 10 in the closed position; and the following closing direction moment (Abbreviated) works.

The gate is further provided with an auxiliary load means 20. The auxiliary load means 20 is provided in the gate body 1.
0 is to apply a load in the gate opening direction.

More specifically, a wire rope 22 is fastened to the upper end of each gate body 10, and these ropes 22 are connected to the recesses 2 a via pulleys 24.
Are respectively introduced into the weight cases 26 fixed to each other, and their ends are fastened to the weight stored in the case 26.

The weight case 26 is a vertically elongated metal or resin cylindrical case as shown in FIG. 3 (a), and is internally connected in a vertical line via a connecting rod 28. The plurality of weights Wa to Wf are stored. Then, the rope 22 is introduced into the case 26 from an introduction hole 26a formed in the upper part of the case, and fastened to the uppermost weight Wa among these weights Wa to Wf.

Although not shown in detail, the connecting rods 28 for connecting the weights Wa to Wf are made of a metal rod that is elongated in the vertical direction, and the weights Wa to Wf arranged vertically next to each other are formed.
The upper and lower weights Wa to Wf are connected with each other in a loosely fitted state. And when the gate is fully closed (when each gate body 10 is in the closed position)
In this state, the weights Wa to Wf are continuously hung vertically at predetermined intervals as shown in the figure, and when the gate is closed from this state (the gate bodies are displaced toward the open position). And the weight Wa as shown in FIG.
ＷWf are sequentially grounded on the support base 30 from the lower side, and when the gates are fully opened (each gate body 1
0 reaches the open position), the weights Wa to Wf are in a stacked state as shown in FIG.
Are grounded. That is,
A load is applied to the gate body 10 in a direction in which the gate is opened, and the load is reduced as the opening degree of the gate increases.

Here, the length of the rope 22 and each weight W
The weight of the gates a to Wf and the distance between the weights Wa to Wf suspended when the gate is fully closed (in the state shown in FIG. 3A) are determined based on the opening of the gate from the fully closed gate state to the fully opened gate state. In consideration of the degree and the closing moment due to only the own weight of the gate body 10 at the opening (that is, the closing moment acting on the gate body 10 in a state where the load by the auxiliary load means 20 is omitted), for example, the following condition is used. Is set to meet.

That is, at an arbitrary gate opening,
The moment in the closing direction (M ₀ ) acting on the gate body 10 due to its own weight and the moment in the opening direction acting on the gate body 10 due to the load of the auxiliary load means (reference numeral M in FIG. 1)
_When the moment in the direction indicated by ₁ ; hereinafter, abbreviated to the opening direction) is summed, the closing moment is always applied to the gate body 10, and the magnitude of the moment is constant. When the gate is fully opened, each weight W is set to be smaller than the closing moment acting on the gate body 10 only by its own weight.
Weights of a to Wf are set.

Next, the operation and effect of the gate will be described.

First, when seawater is not flowing backward, such as at low tide, the flowing water in the channel 1 (the flowing water on the river side (upstream side);
Each of the gate main bodies 10 is displaced from the closed position to the open position by a white arrow in the middle, whereby the gate is in an open state. At this time, the auxiliary load means 2 is attached to the gate body 10.
Because a load in the gate opening direction is given by 0,
Even when the flow rate of the water channel 1 is small, the gate is smoothly fully opened or close to this.

On the other hand, at high tide or the like, the water level on the sea side (downstream side) rises and seawater flows backward (indicated by a broken line arrow in FIG. 1), and the closing moment acting on each gate body due to seawater pressure or the like. Is larger than the opening moment acting on each gate body due to flowing water on the river side, etc.
Is displaced from the open position to the closed position, and the gate is fully closed. At this time, the auxiliary load means 20 is attached to each gate body 10.
However, as described above, since the load is set so that the closing moment acts on the gate body 10 in all the opening ranges, the closing operation of the gate is hindered. The gate can be fully closed quickly as in the conventional non-powered gate of this type.

In such a gate opening / closing operation, as described above, the auxiliary load means 20 is configured to reduce the load as the gate opening increases, resulting in the gate opening / closing operation. Is performed with good responsiveness. In other words, the closing moment acting on the gate body 10 due to its own weight decreases as the opening of the gate increases, but as described above, the load by the auxiliary load means 20 also decreases as the opening of the gate increases. With such a configuration, at an arbitrary opening degree, the magnitude of the closing moment due to its own weight and the magnitude of the opening direction moment due to the load approach each other, and the gate body 10 is in a state close to neutral. Therefore, the gate main body 10 is sensitive to the fluctuation of the flow rate of the water channel 1 or the flow rate at the time of reverse flow, and as a result, the gate opening / closing operation is performed with good responsiveness.

As described above, according to this gate, the auxiliary load means 20 is provided to apply a load to each gate body 10 to assist the opening operation of the gate and facilitate the opening of the gate. Even if the flow rate (flow rate on the river side) 1 is small, the gate can be opened widely to encourage discharge of the river. In addition, since the gate once opened is not difficult to close, the gate can be completely closed immediately at low tide or the like to prevent backflow of seawater. In addition, by reducing the load applied to the gate body 10 as the gate opening increases, the waterway 1
, Or a change in the flow rate of seawater, the gate opening / closing operation can be performed with good responsiveness. In other words, according to this gate, the gate can be quickly and widely opened even when the water channel 1 has a very small flow rate, and the gate can be quickly closed even when seawater flows backward. It is possible to achieve a good balance, and furthermore, there is an effect that the gate opening / closing operation at this time can be performed with good responsiveness.

Further, in all regions from the gate fully closed state to the gate fully opened state, the auxiliary load means 20 is configured such that a constant moment in the closing direction acts on the gate main body 10. The opening operation performance (easiness of opening) or the closing operation performance (easiness of closing) becomes substantially constant regardless of the opening degree of the gate. For this reason, there is also an effect that variation in responsiveness in opening / closing operation due to a difference in gate opening can be reduced.

In addition, the above-mentioned fixed moment acting in the closing direction acting on the gate body 10 is reduced by the moment in the closing direction acting on the gate body 10 only by its own weight when the gate is fully opened (the load by the auxiliary load means 20 is omitted). Since the auxiliary load means 20 is configured to be smaller than the closing moment acting on the gate body 10 in the state, the gate is opened wider even when the flow rate of the water channel 1 (flow rate on the river side) is small. There is an effect when it becomes possible.

By the way, the effect of this non-powered gate that the gate can be opened widely even when the water channel 1 has a very small flow rate and the gate can be closed quickly with the backflow of seawater is provided with the auxiliary load mechanism 20. In a conventional non-powered gate, the inclination of the gate body, that is, the inclination angle of the support shaft with respect to the vertical direction (see the angle θ in FIG. 2) is set to be small (for example, about 0.5 to 1 °) To some extent). However, it is difficult to control the inclination angle of the support shaft at such a small angle when the gate is actually constructed in a waterway or the like, and the workability is extremely poor. On the other hand, according to the configuration of the above-described embodiment, even if the inclination angle θ of the support shaft 12 is set to a relatively large value, the function can be ensured by adjusting the weights of the weights Wa to Wf of the auxiliary load unit 20. it can. Therefore, there is a merit that the workability can be improved by setting the inclination angle θ of the support shaft 12 to the minimum angle that can be easily managed at the time of construction.

The non-powered gate described above is a preferred example of the non-powered gate of the present invention, and the specific configuration thereof can be changed as appropriate without departing from the gist of the present invention.

For example, in the above embodiment, the configuration of the non-powered gate of the present invention is applied to a so-called miter gate of a double door type, but the configuration of the present invention is, of course, applied to a so-called swing gate of a single-door type. It is also possible to apply.

Further, in the above embodiment, the auxiliary load means 20 is configured so that a constant magnitude moment in the closing direction acts on the gate body 10 in all regions from the gate fully closed state to the gate fully opened state. However, it is not always necessary that the moment of a certain magnitude acts on the gate body 10, and the magnitude of the moment acting on the gate body according to the gate opening degree depends on the flow rate of the water channel 1 and the like. The auxiliary load means 20 may be configured to fluctuate.

Further, the auxiliary load means 20 of this embodiment
In the above, the load is changed in accordance with the gate opening by continuously suspending the plurality of weights Wa to Wf on the wire rope 22, but the specific configuration of the auxiliary load means 20 is not limited to this. The configuration is not limited, and any other configuration may be used as long as the load can be changed according to the gate opening. For example, instead of providing the weights Wa to Wf, for example, an elastic body (spring, rubber) may be used, and the load may be changed using the elastic force.

[0039]

As described above, the non-powered gate according to the present invention is provided with the auxiliary load means for applying a load to the gate body in the gate opening direction, and the gate is provided on the gate body at all opening degrees of the gate. Since the load is applied so that the moment in the closing direction is acting, when the upstream side has a very small flow rate, the gate can be widely opened to promote discharge, while when the downstream water level rises However, the gate can be quickly closed without obstructing the closing operation of the gate. In addition, as the opening of the gate increases, the load is reduced, so as the opening of the gate increases, the moment in the closing direction due to its own weight decreases. Thus, the gate opening / closing operation can be performed with good responsiveness in accordance with the fluctuation of the flow rate.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a non-powered gate according to the present invention.

FIG. 2 is a longitudinal sectional view of FIG. 1 showing a non-powered gate.

FIG. 3 is a schematic cross-sectional view showing a configuration of an auxiliary load means ((a) is a gate fully closed state, (b) a gate half open state,
(C) is a diagram showing a gate fully opened state.)

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waterway 10 Gate body 12 Support shaft 20 Auxiliary load means 22 Wire rope 24 Pulley 26 Weight case 28 Connecting rod Wa-Wf Weight

Claims (4)

[Claims] 1. A structure in which a support shaft of a gate main body for opening and closing a gate is provided to be inclined upstream with respect to a vertical direction so that a moment in a gate closing direction due to its own weight acts on the gate main body. In the non-powered gate, auxiliary load means for applying a load in the gate opening direction to the gate body is provided, and the auxiliary load means reduces the load as the gate opening increases. A non-powered gate, wherein a moment in the gate closing direction acts on the gate body over the entire opening range from the gate closed state to the gate fully opened state. 2. The non-powered gate according to claim 1, wherein said auxiliary load means has a plurality of weights connected to said gate body and continuously suspended at predetermined intervals in a vertical direction, and said gate is opened. A non-powered gate, wherein the weights are configured to contact the ground in order from the lower side as the degree increases. 3. The non-powered gate according to claim 1, wherein the moment having a substantially constant magnitude acts on the gate body in all opening ranges from the gate closed state to the gate fully opened state. A non-powered gate comprising a load means. 4. The non-powered gate according to claim 3, wherein the moment having the predetermined magnitude is set to be smaller than a moment in the gate closing direction which acts on the gate body only by its own weight when the gate is fully opened. A non-powered gate characterized by being made.