JP2015038288A - Water reservoir, flap gate and dam with gate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water reservoir capable of preventing water stoppage even when a reference water level largely lowers and superior in maintenance performance, a flap gate provided in the water reservoir and a dam with gate having the flap gate.SOLUTION: A water reservoir 1 has a storage space 1h for storing water. A separation wall 2 is formed with an opening 2h for communicating one space 1a and the other space 1b which are separated from each other by the separation wall 2 and has a flap 10 for opening/closing the opening 2h. The flap 10 is configured to swing between a shut-off state in which the upper end of the flap 10 gets closer to the separation wall 2 to shut off the opening 2h and an open state in which the upper end of the flap 10 swings toward the one space 1a so as to be separated from the separation wall 2 to open the opening 2h. The water reservoir 1 is configured such that, when the water level in the one space 1a is the same as or lower than the water level in the other space 1b, the flap 10 is maintained in the open state; and when a water flow is generated from the one space 1a to the other space 1b, the flap 10 gets into the shut-off state.

Description

  The present invention relates to a water storage tank, a flap gate, and a gate weir.

  In facilities such as thermal power plants, nuclear power plants, and manufacturing plants, seawater or river water is used as a cooling medium for cooling a cooling medium for the device and a coolant for cooling the device. Moreover, in an LNG plant or the like, seawater or river water is used as a thermal medium for vaporizing LNG.

  When such seawater or river water (hereinafter referred to as seawater or the like) is used for cooling or the like, the seawater or the like can be sucked up directly from the sea or river via a pipe or the like. However, in order to prevent damage due to the installation of the pump in the open sea, etc., seawater is usually once introduced into a water tank provided in the building, and the seawater is sucked up from the water tank by the pump. Things have been done. Specifically, the other end of the pipe whose one end is connected to the suction port of the pump is arranged near the inner bottom surface in the water tank, and the pump is operated in this state to suck up the seawater in the water tank. The configuration is adopted.

  Such a water tank is generally installed so that the inner bottom surface thereof is located below the reference water surface even at low tide when the water surface of the sea or river (hereinafter referred to as the reference water surface) is lowest. This is to maintain the water level in the water tank above a certain level even at low tide, etc., and maintain the other end of the pipe immersed in seawater etc., that is, maintain the supply of seawater used for cooling. Because.

  However, even if the water tank is installed as described above, the other end of the pipe may be exposed from the water surface in the water tank if the reference water surface is lower than expected in the sea or river. For example, when a tsunami occurs due to an earthquake or the like, the state of a push tsunami and the state of a tsunami are repeated, but in the case of a tsunami, the reference water level is significantly lower than the normal water level at low tide, and the reference water surface There is a possibility that it will fall below the other end of the pipe in the tank. When such a state occurs, water cannot be absorbed by the pump, and equipment in the facility may not be cooled.

  And when the other end of piping is exposed from the water surface in a water storage tank, a pump may carry out emptying (cavitation). If such emptying occurs, the pump may be damaged. If the pump is damaged, the pump cannot absorb water even if the reference water surface is higher than the other end of the pipe in the water tank and the other end of the pipe is immersed in the water surface in the water tank. That is, the function of cooling the equipment of the facility is completely lost.

  As described above, it is necessary to avoid that the other end of the pipe is exposed from the water surface in the water tank even for a short time. Therefore, even if the reference water surface is lower than expected, It is necessary to provide a mechanism for preventing a drop in the water level in the water tank so that the state positioned above the end can be maintained. In particular, it is desirable to have a structure in which a certain amount of water can be stored in the water storage tank so that the pump can continue to absorb water for a certain period until the water level on the reference water surface recovers.

  For example, a weir or wall that separates the water tank into the sea or river side (external space) and the side where the other end of the pipe is located (internal space) is provided in the water tank. It is conceivable to provide a gate that can cut off the communication with the internal space. With this structure, if the gate is closed when the reference water level is lowered, the water level in the internal space can be prevented from being lowered due to the drop in the reference water surface. On the other hand, if the gate is opened when the reference water level rises, seawater or the like can be supplied again to the internal space.

However, when controlling the opening and closing of the gate by monitoring the reference water surface, a sensor that detects the water level of the reference water surface is provided, and the gate is opened and closed by a gate actuator (cylinder, motor, etc.) based on the signal of this sensor. This complicates the gate structure.
In addition, in the case of a tsunami caused by an earthquake or the like, the state of pushing tsunami and the state of pulling tsunami are repeated, and the reference water level fluctuates periodically. Then, it is necessary to frequently open and close the gate according to the fluctuation of the reference water level, and there is a possibility that the gate cannot be opened and closed appropriately.
And since a sensor and a gate actuating device are used in an emergency, it must always confirm that it operates normally, and its maintenance and management are difficult.

  On the other hand, a technique for automatically operating a flap by a water level difference before and after the flap has been developed without using a special gate operating device or sensor (Patent Documents 1 and 2).

  The technique of Patent Document 1 is a technique related to a flap gate provided on a breakwater that partitions a river and the sea. When the flap swings to the sea side, the gate opens, and when the flap swings to the river side, the gate closes. ing. With this configuration, when the water level on the river side is higher than the sea level, the flap swings to the sea side and the gate opens, so that water can flow from the river side to the sea. On the other hand, when the sea level is higher than the water level on the river side, the flap swings to the river side and closes the gate, so that seawater does not flow from the sea to the river side.

  Patent Document 2 discloses a flap gate provided between adjacent water channels. This flap gate is provided with a flap provided with buoyancy generating means, and this flap is arranged in one water channel. For this reason, when the water level of one water channel becomes higher than the position of the buoyancy generating means, and the difference between the water level of one water channel and the other water channel becomes smaller than a certain level, the flap swings upward due to the buoyancy of the buoyancy generating means. Because it moves, you can open the gate. On the other hand, when the water level of one water channel becomes lower than the position of the buoyancy generating means, the flap swings downward, so that the gate can be closed.

  As described above, in the techniques of Patent Documents 1 and 2, the gate can be opened and closed by swinging the flap only by the difference in water level before and after the gate without using a gate operating device or sensor for operating the gate. . Therefore, if the techniques of Patent Documents 1 and 2 are adopted in the above-described water storage tank, there is a possibility that a water storage tank having a gate that can be simplified in structure and easy to maintain can be formed.

JP-A-11-61785 JP 2011-1619 A

  However, in the case of the techniques of Patent Documents 1 and 2, since the gate swings upward and the gate opens, the water level before and after the gate is comparable to close the gate from the open state. Must be. For this reason, when the techniques of Patent Documents 1 and 2 are used in the water storage tank described above, the gate cannot be closed until the water levels in the external space and the internal space are equal. Then, if the water level in the external space decreases with a decrease in the reference water level, the gate closes, but only the water up to the height of the gate is stored in the internal space at the timing when the gate is closed. In other words, even if the gate is closed, the amount of water stored in the internal space is small, so the pump sucks up the water in the internal space before the reference water level rises and seawater is supplied to the internal space. This may cause water shortage (a situation where the pump cannot absorb water).

  Of course, if the position of the gate (that is, the position of the opening) is increased, the amount of water stored in the internal space can be increased at the timing when the gate is closed, and therefore the possibility of running out of water is reduced. However, if the position of the gate is increased, it takes time to reach a state where water can be supplied to the internal space even when the reference water surface rises (a state where the reference water surface is equal to or higher than the gate position). Then, in the case where a push tsunami and a pulling tsunami repeat like a tsunami (that is, when the water level fluctuates periodically), even if a push tsunami occurs, the reference water surface is higher than the gate position. There is a possibility that time will be shortened and a sufficient amount of water will not be supplied into the interior space during the push tsunami. Then, even if the gate position is raised and the amount of water stored in the internal space is increased at the timing when the gate is closed, the amount of water sucked up by the pump during the period when the gate is closed is supplied to the internal space during the tsunami. If the amount of water is exceeded, drainage may occur.

  As described above, at present, in the water tank whose inner bottom surface is lower than the reference water surface, it is possible to prevent water drainage of the internal space when the reference water surface is significantly lowered, and those that are excellent in maintainability There is no need for such a reservoir.

  In view of the above circumstances, the present invention is capable of preventing water shortage even when the reference water level is significantly lowered, and having a water tank excellent in maintainability, a flap gate suitable for such a water tank, and such a flap gate. An object is to provide a gated weir.

(Water storage tank)
A water storage tank according to a first aspect of the present invention is a water storage tank having a storage space in which water can be stored and having a separation wall separating the inside of the storage space, the separation wall being separated by the separation wall. An opening that communicates between one space and the other space is formed, and the separation wall includes a flap that opens and closes the opening, and the upper end of the flap approaches the separation wall and closes the opening. It is possible to swing between a shut-off state and a communication state in which the upper end of the space is swung toward the one space side so as to be separated from the separation wall and the opening is opened, and the water level in the one space is When the water level is equal to or lower than the water level in the other space, the communication state is maintained, and the water flow from the one space toward the other space is provided so as to be in the blocking state. To do.
The water storage tank according to a second aspect of the present invention is the water tank according to the first aspect of the present invention, wherein the swing center of the flap is located between the upper end and the lower end of the flap and between the upper end and the lower end of the opening. It arrange | positions so that it may be located.
The water tank according to a third aspect of the invention is characterized in that, in the first or second aspect of the invention, the flap is provided so as to be inclined to the one space side with respect to the vertical direction in the shut-off state. And
A water tank according to a fourth invention is characterized in that, in the first, second or third invention, the flap is provided so as to be inclined upward with respect to a horizontal direction in the communication state. .
According to a fifth aspect of the present invention, in the first, second, third or fourth aspect of the present invention, the one of the storage spaces in the storage space is communicated with the sea, and the other space is the other. It is connected with the drain outlet of the drainage means which discharges water outside from the space.
The water storage tank according to a sixth aspect of the present invention is the first, second, third, fourth or fifth invention, wherein the water storage tank is provided with an operation confirmation mechanism provided above the opening in the separation wall, The operation confirmation mechanism includes a connecting portion that can be connected to and detached from the flap, a pulling unit that pulls the connecting portion toward the opening of the separation wall, and an urging force in a direction of separating the connecting portion from the opening of the separation wall. And an urging means.
(Flap gate)
A flap gate according to a seventh aspect of the present invention is a gate for communicating and blocking an opening communicating with a pair of spaces in which a liquid is accommodated, and the gate includes a flap that opens and closes the opening by approaching and separating from the opening. The flap has a closed state in which the upper end approaches the opening and closes the opening, and the flap swings to one space side of the pair of spaces so that the upper end moves away from the opening and communicates to open the opening. The liquid level in the one space is maintained at the communication state when the liquid level in the one space is equal to or lower than the liquid level in the other space, When the flow of the liquid which goes to this space generate | occur | produces, it is provided so that it may be in the said interruption | blocking state.
The flap gate according to an eighth aspect of the present invention is the flap gate according to the seventh aspect, wherein the swing center of the flap is located between the upper end and the lower end of the flap and between the upper end and the lower end of the opening. It arrange | positions so that it may be located.
According to a ninth aspect of the present invention, in the seventh or eighth aspect, the flap gate is provided so as to be inclined to the one space side with respect to the vertical direction in the cut-off state. And
According to a tenth aspect of the present invention, in the seventh, eighth, or ninth aspect, the flap is provided so as to be inclined upward with respect to a horizontal direction in the communication state. .
The water storage tank of an eleventh aspect of the present invention is the seventh, eighth, ninth or tenth aspect of the present invention, further comprising an operation confirmation mechanism installed at the upper part of the opening, and the operation confirmation mechanism can be connected to and detached from the flap. And a tension means for pulling the connection portion toward the opening, and a biasing means for biasing the connection portion in a direction away from the opening.
(Weir with gate)
A gated weir according to a twelfth aspect of the present invention includes a main body portion having an opening formed therein and a flap provided in the main body portion, and the flap according to any of the seventh to eleventh aspects of the invention. It is characterized by being.

(Water storage tank)
According to the first invention, when the water level in one space is equal to or less than the water level in the other space, the one space and the other space are maintained in communication with each other through the opening. Then, the water in the other space can be supplied to one space due to the water level difference in both spaces. On the other hand, when a water flow that flows from one space toward the other space is formed due to a decrease in the water in the other space, the flap swings due to the water flow, and the flap is in a blocked state. It becomes. Then, since the opening is closed by the flap and one space and the other space can be separated, when the water in the other space decreases, a state where a certain amount or more of water is stored in the one space can do. In addition, if a water flow that flows from one space to the other space is formed, the flap is operated so as to be in a shut-off state. The stored water can be stored almost as it is in one space. Further, since the flap is automatically swung by the water flow caused by the water level difference in both spaces, it is not necessary to control the operation of the flap. That is, since it is not necessary to provide a device or a sensor for operating the flap, the structure of the water storage tank can be simplified.
According to the second aspect of the present invention, the flap can be smoothly swung from the communication state to the cutoff state when a water flow from one space to the other space is formed. Moreover, even when the water in the other space is exhausted, it is possible to prevent the flap from opening due to the water head difference.
According to the third aspect of the present invention, it is easy to maintain the flap in a communicating state in a state in which a water flow from one space to the other space is not formed.
According to the fourth aspect of the present invention, when the water flow from one space to the other space is formed, the flap can be easily swung so as to be in a cut-off state.
According to the fifth invention, when a tsunami pulling tsunami occurs, if the flap is cut off, the water stored in one space at the timing when the pulling tsunami occurs is almost as it is in one space. Can be stored. In addition, if a push tsunami occurs, the flaps are in communication, and water can be supplied into one space. Can replenish space. Therefore, even if a tsunami caused by a tsunami occurs, it is possible to prevent the drain outlet of the drainage means from being exposed, and drainage by the drainage means (that is, water absorption to the outside) can be continued.
According to the sixth invention, when the connecting portion is connected to the flap and the connecting portion is pulled toward the opening of the separation wall by the pulling means, it is confirmed whether or not the flap swings toward the opening of the separating wall. be able to. Further, if the pulling force is removed from the state where the connecting portion is pulled toward the opening of the separation wall, the connecting portion can be urged away from the opening of the separating wall by the urging means, so that the flap is separated. It can be confirmed whether or not the rocking is performed in a direction away from the opening of the wall. In other words, if an operation check mechanism is provided, it is possible to check whether the flap operates by simply connecting the connecting portion to the flap and pulling the connecting portion by the pulling means. can do.
(Flap gate)
According to the seventh aspect, when the liquid level in one space is equal to or lower than the liquid level in the other space, the one space and the other space are maintained in communication with each other through the opening. Then, the liquid can be supplied from the other space to the one space due to a liquid level difference between the two spaces. On the other hand, when a liquid flow from one space toward the other space is formed due to a decrease in the liquid level in the other space, the flap oscillates due to the liquid flow, and the flap Is cut off. Then, the opening is closed by the flap, so that one space and the other space can be separated, so that when the liquid level in the other space decreases, the liquid flow in the one space is reduced. It is possible to maintain the state of the formed timing. In addition, since the flaps are automatically swung by the liquid flow caused by the liquid level difference in both spaces, it is not necessary to control the operation of the flaps. That is, since it is not necessary to provide a device or a sensor for operating the flap, the gate structure can be simplified.
According to the eighth aspect, when the liquid flow from one space to the other space is formed, the flap can be smoothly swung from the communication state to the cutoff state. In addition, even when the liquid in the other space is exhausted, the flap can be prevented from opening due to the water head difference.
According to the ninth aspect, it is easy to maintain the flap in a communicating state in a state in which a liquid flow from one space to the other space is not formed.
According to the tenth aspect, when the flow of the liquid from one space to the other space is formed, the flap can be easily swung so as to be in a cut-off state.
According to the eleventh aspect of the invention, if the connecting portion is connected to the flap and the connecting portion is pulled toward the opening by the pulling means, it can be confirmed whether or not the flap swings toward the opening. Further, if the pulling force is removed from the state where the connecting portion is pulled toward the opening, the connecting portion can be urged away from the opening by the urging means, so that the flap is directed away from the opening. It can be confirmed whether or not it swings. In other words, if an operation check mechanism is provided, it is possible to check whether the flap operates by simply connecting the connecting portion to the flap and pulling the connecting portion by the pulling means. can do.
(Weir with gate)
According to the twelfth aspect of the present invention, if the main body is installed in a space in which the liquid is accommodated and the space is separated by the main body, the flow of the liquid moving between the spaces separated through the opening is controlled. Can do.

It is a schematic explanatory drawing of the water storage tank 1 of this embodiment provided with the separation wall 2 which has the flap 10. FIG. It is a schematic explanatory drawing of the operating condition of the flap 10, (A) is a communication state, (B) is a interruption | blocking state. It is single-piece explanatory drawing of the flap 10, (A) is a front view, (B) is a side view. It is a schematic explanatory drawing of the state which provided the operation confirmation mechanism 20 in the separation wall 2. FIG. It is the graph which showed the calculation result of the Example.

  The water storage tank of the present invention is a water storage tank used when taking water from seawater or rivers in facilities such as thermal power plants, nuclear power plants, and manufacturing plants. Even when the water level of the water drops, it is characterized in that water intake can be continued.

In addition, the water storage tank of this invention is not restricted to the water storage tank used for the water intake of the above facilities, The use is not specifically limited.
Moreover, the use of the flap gate provided in the water storage tank of the present invention is not particularly limited. For example, it can be used as a device that is installed on a seawall and closes the passage without human intervention when the Otsutsu wave arrives.

  Below, the case where seawater is taken into the water storage tank of the present invention, the seawater in the water storage tank is sucked up by a pump, and used for cooling various equipment in the facility will be described. The pump in the following description corresponds to the drainage means referred to in the claims.

(Water tank 1 of this embodiment)
Next, the water tank 1 of the present embodiment will be described with reference to the drawings.
First, the basic configuration and function of the water storage tank 1 of the present embodiment will be described.

In FIG. 1, the code | symbol 1 has shown the water tank of this embodiment. The water storage tank 1 is provided with a storage space 1h that is a hollow space inside, and seawater can be stored in the storage space 1h.
As shown in FIG. 1, one end (water absorption end) of the drain pipe P is immersed in the storage space 1h. The other end of the drainage pipe P is connected to a water inlet of the pump. By operating the pump, seawater in the storage space 1h is sucked up and transported to various equipment in the facility, and used for cooling various equipment. It has become so.

  On the other hand, this water tank 1 is provided with an external water source, that is, a water intake 1i for taking seawater from the sea. This intake port 1i is communicated with the sea through intake pipes. That is, seawater is supplied into the storage space 1h of the water storage tank 1 through the intake pipe and the intake port 1i.

  Moreover, as shown in FIG. 1, the water storage tank 1 is provided such that the inner bottom surface b thereof is at a position lower than the sea surface WL (hereinafter referred to as the reference water surface WL). More specifically, the water storage tank 1 is provided so that the inner bottom surface b is always lower than the reference water surface WL even if the reference water surface WL fluctuates due to tide fullness. Specifically, the water tank 1 is provided so that the inner bottom surface b is lower than the reference water surface WL (lowest water surface) at the time of low tide.

  For this reason, even if the seawater in the storage space 1h is discharged outside by the pump, the storage space 1h is passed through the intake pipe and the intake port 1i so that the water surface W in the storage space 1h matches the reference water surface WL. Can be supplied with seawater. That is, even if the seawater in the storage space 1h is discharged outside by the pump, the water level in the storage space 1h can be maintained at the same level as the reference water surface WL.

  The water absorption end of the drainage pipe P is disposed at a position lower than the reference water surface WL (lowest water surface) at low tide, that is, the water absorption end of the drainage pipe P is located below the water surface even at the lowest water surface. Then, even if the fluctuation of the reference water surface WL due to tide fullness occurs, it is possible to always supply cooling water to the facility.

  In addition, the height which arrange | positions the other end of the intake pipe connected to the intake port 1i, ie, the edge part (intake end) arrange | positioned in the sea in an intake pipe, is not specifically limited. However, the water intake end of the pipe is usually disposed at a position lower than the inner bottom surface b of the water storage tank 1. This enhances the effect of cooling equipment and the like by using seawater at a deeper position (seawater at a lower temperature), and when the reference water surface WL is lowered, the intake end is exposed on the reference water surface WL and the seawater This is to prevent water from being taken out.

  Below, the characteristic structure of the water storage tank 1 of this embodiment is demonstrated.

(Separation wall 2)
As shown in FIG. 1, the water storage tank 1 of the present embodiment is provided with a separation wall 2 that separates the storage space 1 h into two spaces. Specifically, due to the separation wall 2, the storage space 1h is divided into a space (supply space 1a) on the side where the intake port 1i is provided and a space (drainage space) on the side where the water absorption end of the drainage pipe P is provided. 1b).

  As shown in FIG. 1, the separation wall 2 is provided with an opening 2h. The opening 2h is a through hole that penetrates the separation wall 2 and communicates the supply space 1a and the drainage space 1b. That is, the seawater that has flowed into the supply space 1a of the storage space 1h from the intake port 1i is supplied from the supply space 1a to the drainage space 1b through the opening 2h.

  The opening 2h is formed in a substantially rectangular cross section, and a protruding seal portion 2s is provided on the inner surface along the inner periphery. The seal portion 2s is a portion that comes into contact with the bracket 12 of the main body 11 in the flap 10 to be described later, and details thereof will be described later.

  The height at which the opening 2h is provided is not particularly limited. However, in order to make it easy to supply the seawater that has flowed into the supply space 1a to the drainage space 1b, it is desirable to dispose it at the bottom of the separation wall 2, that is, at a position close to the inner bottom surface b of the water storage tank 1. In the water tank 1 of the present embodiment, even if the opening 2h is disposed at a position close to the inner bottom surface b of the water tank 1, the flap 10 described later is provided in the opening 2h. In addition, a sufficient amount of water can be stored in the drainage space 1b.

  In addition, the height of the separation wall 2 is not particularly limited. However, when the flap 10 is closed due to a drop in the water level in the supply space 1a, the height of the drainage space 1b is sufficient to store a predetermined amount of water. That's fine. For example, until the water level in the supply space 1a is recovered after the flap 10 is closed, the water can be stored in the drainage space 1b so that the water absorption end of the drainage pipe P can be immersed in seawater. It is desirable to have a volume.

  Further, if the height of the separation wall 2 is adjusted, seawater can be supplied from the supply space 1a to the drainage space 1b so as to exceed the separation wall 2 when the reference water surface WL becomes high. For example, if the height of the separation wall 2 is set to be slightly lower than the reference water level WL at low tide, the seawater is not only opened at the time of low tide, but also across the separation wall 2 as well as the opening 2h of the separation wall 2. It can be set as the state supplied to the drainage space 1b from the supply space 1a.

(Flap 10)
As shown in FIGS. 1 and 2, the separation wall 2 is provided with a flap 10 for opening and closing the opening 2h. The flap 10 is formed in a shape substantially similar to the opening 2h, and is attached to the separation wall 2 so as to be swingable. Specifically, the opening 2h is closed when the flap 10 swings to a substantially vertical state (see FIG. 2B), and the opening 2h opens when the flap 10 swings and the upper end is separated from the opening 2h (see FIG. 2B). As shown in FIG. 2A, the flap 10 is attached to the separation wall 2.

The flap 10 is provided so as to automatically open and close the opening 2h depending on the water level difference between the supply space 1a and the drainage space 1b and the direction of the water flow between the supply space 1a and the drainage space 1b. is there.
Hereinafter, the flap 10 having such a function will be described in detail.

  As shown in FIGS. 1 to 3, the flap 10 includes a main body 11 formed in a substantially box shape, a bracket portion 12, and a pair of swing shafts 13 and 13.

  First, the pair of swing shafts 13 and 13 are provided on the side surface of the main body 11 so as to be coaxial with each other. The pair of swing shafts 13 and 13 are rotatably attached to the inner surface of the opening 2 h of the separation wall 2. Specifically, the pair of swing shafts 13 and 13 are attached to the inner surface of the opening 2h of the separation wall 2 so that the central axis (swing shaft) is horizontal.

  For this reason, the flap 10 can swing around the central axis of the pair of swing shafts 13, 13 with respect to the separation wall 2. That is, since the flap 10 can swing around a horizontal swing axis, the flap 10 swings between a substantially vertical state (blocking state) and a state separated from the opening 2h (communication state). It can be made. The central axis of the pair of swing shafts 13 and 13 corresponds to the swing center referred to in the claims.

  As shown in FIG. 3A, the main body 11 of the flap 10 is formed in a substantially rectangular shape when viewed from the front. The main body 11 is substantially similar to the opening 2h when viewed from the front, but is formed to be smaller than the opening 2h. Specifically, it is formed to be slightly smaller than an opening formed on the inner end face of the seal portion 2s provided on the inner surface of the opening 2h (hereinafter referred to as a seal portion opening Sh) (see FIG. 3). That is, the main body 11 is formed in a size that can be accommodated in the seal portion opening Sh.

  A plate-like bracket portion 12 is provided on the side surface of the main body 11 of the flap 10 along the side surface. The plate-like bracket portion 12 is formed so that the surface thereof is substantially parallel to the surface of the main body 11. The outer diameter of the bracket portion 12 is formed to be larger than the seal portion opening Sh and slightly smaller than the opening 2h.

  For this reason, when the flap 10 swings and is in a cut-off state, the main body 11 is disposed in the seal portion opening Sh, while the bracket portion 12 is in a state in which the surface thereof is in contact with the surface of the seal portion 2s. Then, due to the contact between the surface of the bracket portion 12 and the surface of the seal portion 2s, both sides of the seal portion 2s, in other words, both sides of the opening 2h are blocked by the flap 10. That is, since the opening 2h can be closed by the flap 10, the gap between the supply space 1a and the drainage space 1b can be blocked by the flap 10.

  In addition, it is preferable to provide a sealing member Sg such as a rubber plate on either the surface of the bracket portion 12 or the surface of the seal portion 2s (see FIG. 4). Then, when the surface of the bracket portion 12 and the surface of the seal portion 2s come into contact with each other, the sealing performance of the contact portion can be improved, and the opening 2h can be closed almost liquid tightly by the flap 10.

  For example, in the case of the flap 10 having the structure as shown in FIG. 3, in the shut-off state, the surface of the bracket portion 12 positioned above the pair of swing shafts 13 and 13 is the surface on the drainage space 1b side of the seal portion 2s. Contact (see FIG. 2B). Conversely, the surface of the bracket portion 12 positioned below the pair of swing shafts 13 and 13 contacts the surface on the supply space 1a side of the seal portion 2s (see FIG. 2B). Therefore, in the seal portion 2s, the seal member Sg is provided on the surface on the drainage space 1b side at a portion above the pair of swing shafts 13 and 13, and the seal member Sg is disposed at a portion below the pair of swing shafts 13 and 13. If it is provided on the surface on the supply space 1a side, the effect of closing the opening 2h liquid-tightly by the flap 10 can be enhanced (see FIG. 2).

The pair of swing shafts 13 and 13 are provided on the side surface of the main body 11 of the flap 10, but the central axis thereof is provided below the middle of the main body 11 in the vertical direction. .
On the other hand, the seal portion 2s of the opening 2h is provided so that the center surface of the flap 10 (surface that bisects the flap 10 in the thickness direction) is slightly inclined toward the drainage space 1b in the shut-off state. It has been.

  With this configuration, the flap 10 is applied with a force for swinging the tip portion downward even when the flap 10 is in the cut-off state. For this reason, unless a force that pushes the flap 10 toward the opening 2h is not applied, the flap 10 swings so as to tilt toward the drainage space 1b even from the shut-off state. In other words, the flap 10 is in a state in which the upper end is swung toward the drainage space 1b, in other words, a communication that opens the opening 2h, in a state where a force that swings the upper end upward (for example, buoyancy or water flow) is not applied. It becomes a state.

(Operation of the water storage tank 1 of the present embodiment)
Below, the effect of the water tank 1 of this embodiment which has the above structures is demonstrated.

  First, if seawater is introduced into the supply space 1a of the storage space 1h through the intake port 1i, the seawater can be stored in the storage space 1h (supply space 1a and drainage space 1b) to the same height as the reference water surface WL. Then, when the seawater in the drainage space 1b is discharged to the outside by the pump, the same amount of seawater as the discharged amount is supplied from the supply space 1a to the drainage space 1b through the opening 2h of the separation wall 2. At the same time, the same amount of seawater as that supplied to the drainage space 1b is supplied to the supply space 1a through the intake port 1i. Therefore, even if the seawater in the drainage space 1b is discharged outside by the pump, the inside of the storage space 1h (the supply space 1a and the drainage space 1b) is maintained at the same height as the reference water surface WL. At this time, since the flap 10 is in a communicating state, the flow of seawater through the opening 2h of the separation wall 2 is not inhibited by the flap 10.

  On the other hand, when the reference water surface WL falls below the water level in the storage space 1h due to the influence of the tsunami, the seawater is discharged from the supply space 1a to the outside through the water intake 1i. In this case, a water flow from the drainage space 1b to the supply space 1a is generated in the storage space 1h, and a water flow from the drainage space 1b to the supply space 1a is also generated through the opening 2h of the separation wall 2. At this time, due to this water flow, water pressure is applied so as to push the flap 10 toward the opening 2h (that is, the separation wall 2), so that the flap 10 swings from the communication state to the cutoff state. Then, if the flap 10 is cut off, the opening 2h of the separation wall 2 is closed in a liquid-tight state, so that the drainage space 1b is liquid-tightly separated from the supply space 1a by the separation wall 2. . That is, the seawater stored in the drainage space 1b at the time when the flap 10 is cut off (timing when the water flow from the drainage space 1b toward the supply space 1a is formed) is held in the drainage space 1b almost as it is. be able to. Then, even if the reference water surface WL is lowered, the operation of discharging the seawater stored in the drainage space 1b to the outside by the pump can be continued, so even if a tsunami occurred, the seawater was used. Work such as cooling can be continued.

  When the operation of discharging seawater to the outside by the pump is continued, the amount of seawater in the drainage space 1b is reduced, and the water level in the drainage space 1b is also lowered. However, when the reference water level WL rises, the water level in the supply space 1a rises and becomes higher than the water level in the drainage space 1b. Then, the flap 10 swings so as to change from the shut-off state to the communication state due to its own weight or a difference in water level between the supply space 1a and the drainage space 1b. Then, since the opening 2h of the separation wall 2 is opened, seawater is supplied from the supply space 1a to the drainage space 1b, and the water level of the drainage space 1b rises to the same water level as the supply space 1a. The water level becomes the reference water surface WL.

  As described above, in the water storage tank 1 of the present embodiment, when the reference water surface WL is greatly lowered due to the influence of a tsunami or the like, the opening 2h of the separation wall 2 is closed by the flap 10 and the drainage space 1b has a certain amount or more. A large amount of seawater can be stored. And if the water flow which flows toward the supply space 1a from the drainage space 1b is formed, it will operate | move so that the flap 10 may be smoothly interrupted | blocked. For this reason, the seawater stored in the drainage space 1b at the timing when the water flow is formed can be stored in the drainage space 1b almost as it is. That is, when a pulling tsunami occurs, a sufficient amount of seawater can be stored in the drainage space 1b regardless of the position (height) where the opening 2h of the separation wall 2 is provided. Even if a tsunami or the like occurs, it is possible to continue cooling the equipment using the seawater in the drainage space 1b.

  Further, since the flap 10 is automatically swung by the water flow caused by the water level difference between the supply space 1a and the drainage space 1b, it is not necessary to control the operation of the flap 10. That is, since it is not necessary to provide a device or a sensor for operating the flap 10, the structure of the water tank 1 can be simplified.

(About flap 10)
In the cut-off state, the angle θ1 (hereinafter simply referred to as angle θ1) formed by the center plane of the flap 10 with respect to the vertical plane is not particularly limited. What is necessary is just to be able to swing the flap 10 toward the drainage space 1b in a state where no force is applied to swing the upper end of the flap 10 upward. However, in order to smoothly swing the flap 10 from the shut-off state to the communication state, the angle θ1 is preferably 2 to 6 degrees, and more preferably 2 to 4 degrees.

  Moreover, if the flap 10 is only maintained in a communicating state, it is preferable that the flap 10 has a larger weight at the tip. However, as described above, when the water flow from the drainage space 1b side to the supply space 1a side occurs, such as when a tsunami occurs, the flap 10 swings from the communication state to the cutoff state. There must be. That is, the upper end of the flap 10 is swung upward so that the flap 10 is shut off from the communication state against the force of swinging the upper end of the flap 10 downward only by the urging force caused by the water flow. It must be possible.

  For this reason, the flap 10 is associated with the length L2 of the portion above the pair of swing shafts 13 and 13 being longer than the length L1 of the portion below the pair of swing shafts 13 and 13. Instead, the weight of the portion below the pair of swing shafts 13, 13 is formed to be slightly heavier than the weight of the portion above the pair of swing shafts 13, 13. With such a structure, the rotational moment around the pair of rocking shafts 13 and 13 applied to the flap 10 due to gravity can be in an appropriate state, so that a water flow from the drainage space 1b toward the supply space 1a is formed. The flap 10 can be smoothly swung from the communication state to the shut-off state. For example, if the length L1 is 350 mm, the length L2 is 700 mm, the weight of the lower part is 110 kg, and the weight of the upper part is 90 kg, the flap 10 can be smoothly swung.

  In addition, the flap 10 may have a structure in which a pair of shafts 13 and 13 are provided at the lower end thereof. However, as described above, the pair of shafts 13 and 13 are disposed between the upper end and the lower end of the flap 10. It is desirable to provide such a position. In other words, it is desirable that the flap 10 has a structure that has a portion that receives water pressure at an upper portion and a lower portion of the pair of shafts 13 and 13, respectively. With such a configuration, even when the seawater in the supply space 1a is completely removed after the flap 10 is shut off, the flap is caused by the head difference applied to the upper and lower portions of the pair of shafts 13 and 13 in the flap 10. 10 can be maintained in the shut-off state.

  Furthermore, if the flap 10 can be smoothly swung from the communication state to the shut-off state when a water flow from the drainage space 1b side to the supply space 1a side is generated, the center surface of the flap 10 in the communication state can be used. There is no particular limitation on the magnitude of the angle θ2 (hereinafter simply referred to as the angle θ2) formed by the horizontal plane. However, if the angle θ2 is too small, there is a possibility that even if the water flow is generated, the flap 10 does not swing smoothly from the communication state to the cutoff state. Therefore, when the flap 10 is smoothly swung from the communication state to the cutoff state when the water flow is generated, the angle θ2 in the communication state should not be so small. For example, when the flap 10 is smoothly swung when the water flow is formed, the angle θ2 is preferably 35 degrees or more, more preferably 40 degrees or more, and further preferably 45 degrees or more.

  On the other hand, in the communication state, the angle θ2 is as small as possible when supplying water smoothly from the drainage space 1b to the supply space 1a through the opening 2h (in other words, increasing the flow rate of the water flow passing through the opening 2h). Is preferred.

  Accordingly, when a water flow from the drainage space 1b toward the supply space 1a is generated, the flap 10 can be smoothly swung from the communication state to the cutoff state, and the supply space 1a to the drainage space 1b in the communication state. In supplying water smoothly, the angle θ2 is preferably 35 to 50 degrees, and more preferably 40 to 45 degrees.

(Swing restricting member 15)
In the communication state, it is desirable that the swing of the flap 10 is restricted so as not to swing more than a certain angle. The method for restricting the swing of the flap 10 is not particularly limited. For example, the swing restricting member 15 as described below can be provided to restrict the swing of the flap 10.

  As shown in FIG. 2, a swing regulating member 15 erected on the separation wall 2 is provided on the surface of the separation wall 2 on the drain space 1 b side. The swing regulating member 15 contacts the main body 11 of the flap 10 when the swing angle of the flap 10 reaches a predetermined angle (for example, angle θ2) when the flap 10 swings toward the drainage space 1b. It is arranged like this. If such a swing restricting member 15 is provided, it can swing only to the position of the swing restricting member 15 even if the flap 10 swings toward the drainage space 1b. Then, when the water flow is formed, the flap 10 can be smoothly swung from the communication state to the cutoff state. The structure of the portion where the swing restricting member 15 and the main body 11 of the flap 10 are in contact with each other is not particularly limited. For example, as shown in FIG. 2, a support surface 15a inclined with respect to the horizontal (specifically, a support surface 15a provided so as to incline upward along a direction away from the separation wall 2) is provided. The support surface 15 a may be in surface contact with the surface of the main body 11 of the flap 10.

(Number of openings 2h)
The opening 2h provided with the flap 10 may be provided at only one place on the separation wall 2, but it is desirable to provide a plurality of openings. If a plurality of openings 2h are provided, even if the flap 10 provided in one opening 2h cannot be opened in a shut-off state, the flaps 10 provided in the other openings can be in communication. That is, the supply space 1a and the drainage space 1b can be brought into communication with each other through the other opening 2h. Then, after the water level in the supply space 1a is lowered and the flap 10 is cut off, when the water level in the supply space 1a is restored, the flap 10 provided in the one opening 2h breaks down and does not swing. However, water can be supplied from the supply space 1a to the drainage space 1b.

(Weir with gate)
In the above example, the case where the separation wall 2 is fixed to the water tank 1 has been described. However, the separation wall 2 may be detachably provided to the water tank 1. In other words, a dam with a gate that can be attached to and detached from the water storage tank 1 may be used as the separation wall 2. In other words, a main body in which an opening is formed and a weir provided with the flap 10 described above may be used as the separation wall 2.

When such a weir with a gate is used as the separation wall 2, it is possible to adjust the capacity of the drainage space 1b if the installation position of the gate weir (the position in the left-right direction in FIG. 1) can be adjusted. . Then, when the facility for supplying the cooling water is repaired or the like, the drainage space 1b having an appropriate size can be provided in the water storage tank 1.
Further, even when the installation position of the gated weir cannot be changed, the capacity of the drainage space 1b can be changed also by changing the height of the gated weir.

  In addition, if it is a weir with a gate as mentioned above, it can be used besides the separation wall which isolate | separates the space in which liquids, such as the water tank 1, are accommodated. That is, it can be used as a device for controlling the flow of liquid so that the flow of liquid from one side to the other side is allowed but not vice versa. For example, if the flap 10 is installed on a tide embankment so that it swings to the sea side, the above-mentioned gated weir can be used as a device for closing the passage without manual intervention when the Otsutsu wave arrives.

(Operation check mechanism)
Since the flap 10 provided on the separation wall 2 of the water storage tank 1 is usually immersed in water, it is desirable to provide the following mechanism in order to confirm the operation of the flap 10. .

  In FIG. 4, the code | symbol 21 has shown the main-body part of the operation confirmation mechanism 20 provided in the upper part of the opening 2h of the separation wall 2. In FIG. The main body 21 includes a pulley 21r, and a wire 23 is wound around the pulley 21r. The wire 23 extends to the outside of the water storage tank 1 through a pipe 21p provided along the separation wall 2 at the base end. That is, the base end of the wire 23 can be operated from the outside of the water tank 1.

  On the other hand, a connecting portion 22 is attached to the tip of the wire 23. The connecting portion 22 can be connected to and detached from the flap 10. For example, if the flap 10 is a metal, an electromagnet can be used as the connecting portion 22.

  A biasing member 24 is provided between the connecting portion 22 and the main body portion 21. The urging member 24 has a function of urging the connecting portion 22 in a direction away from the main body portion 21 (in other words, a direction separating the connecting portion 22 from the opening 2 h of the separation wall 2). For example, a spring, rubber, looseness or the like can be used as the biasing member 24.

  Since it is the above structure, if the connection part 22 is connected with the flap 10 in a communication state, and the wire 23 is pulled to the base end side, the flap 10 is pulled toward the opening 2h of the separation wall 2 together with the connection part 22. be able to. Then, whether or not the flap 10 swings toward the opening of the separation wall 2h depending on whether or not the wire 23 can be pulled more than a certain amount, that is, swings so that the flap 10 is cut off from the communication state. It can be confirmed whether or not it is possible.

  On the other hand, if the force pulling the wire 23 is removed from the state in which the wire 23 is pulled to swing the flap 10 toward the opening 2 h of the separation wall 2, the urging member 24 moves the flap 10 together with the connecting portion 22. The separation wall 2 can be pushed away from the opening 2h. Then, whether or not the flap 10 swings in a direction away from the opening of the separation wall 2h depending on whether or not the wire 23 moves more than a certain amount toward the tip, that is, the flap 10 is changed from the shut-off state to the communication state. It can be confirmed whether or not it can be swung.

  As described above, if the operation confirmation mechanism 20 is provided, the connecting portion 22 is connected to the flap 10 and the wire 23 is pulled, or conversely, the tensile force is removed from the pulled state of the wire 23. It can be confirmed whether the flap 10 operates. And if the base end of the wire 23 is arrange | positioned outside the water storage tank 1, since the operation | movement confirmation of the flap 10 can be performed in the state which submerged the flap 10, the operation confirmation of the flap 10 becomes easy.

  The wire 23 described above is the pulling means in the claims, but the pulling means is not particularly limited as long as it can pull the connecting portion 22 toward the opening 2h of the separation wall 2. For example, a hydraulic piston, a link mechanism, etc. can be used as a tension means.

  A camera may be provided on the main body 21 of the operation confirmation mechanism 20 or the like. In this case, the operation of the flap 10 can be confirmed not only by the moving amount of the wire 23 but also by an image, which is preferable.

(Other uses of flap 10)
In the above example, the case where the flap 10 is provided in the opening 2h of the separation wall 2 of the water tank 1 has been described. However, the flap 10 can be used in any place as long as it is used for the functions described above. In other words, it is an opening that communicates a pair of spaces separated by walls, etc., and requires water flow from one space to the other, but does not allow water flow from the other space to the other. In the opening to be made, the flap 10 can be adopted as a gate for controlling the water flow.

  Whether the water tank of the present invention can be used as a water tank for temporarily storing seawater for use as cooling water, whether the water level fluctuation of the water tank during tsunami and the supply of seawater to the outside can be maintained. Was confirmed by calculation.

  In the water tank as shown in Fig. 1, when the fluctuation of the reference water level (tsunami water level) due to the tsunami occurs, the opening / closing timing of the opening due to the flap and the fluctuation of the water level in the drainage space (water level in the weir) are examined. It was.

In the calculation, it was assumed that the tsunami water level fluctuated in a sine wave, and the water level in the supply space was the same as the tsunami water level. It was also assumed that a certain amount of water (50 m ³ / min) was drained from the drainage space (inside the weir).

The results are shown in FIG.
As shown in FIG. 5, when a pulling tsunami occurs and the tsunami water level becomes lower than the weir (separation wall), it can be confirmed that the flap is activated and the opening is closed in a short time. And if a flap closes opening, it can also confirm that the water level in a weir is not influenced by the tsunami water level.

  Moreover, when the tsunami water level rises and becomes higher than the weir water level, it can be confirmed that the flap is activated and the opening is opened. And it can be confirmed that the water level in the weir can be recovered while the tsunami water level is rising by opening the opening.

  Although the water level in the weir fluctuates due to fluctuations in the tsunami water level and the opening and closing of the flaps, the water level in the weir can be maintained higher than the height of the pump suction port, and the supply of seawater to the outside can be maintained. Can be confirmed.

  As described above, if the water storage tank of the present invention is provided with the flap of the present invention at the opening of the separation wall, the water level in the water storage tank can be maintained at a level that can maintain the supply of seawater to the outside even if a pulling tsunami occurs. It was confirmed that it could be kept.

  The water storage tank of the present invention is suitable as a water storage tank for temporarily storing seawater and river water in a power plant or factory.

DESCRIPTION OF SYMBOLS 1 Water storage tank 1h Storage space 1a Supply space 1b Drainage space 2 Separation wall 2h Opening 2s Seal part 10 Flap 11 Main body 12 Bracket part 13 Oscillation shaft 20 Operation confirmation mechanism 22 Connection part 24 Energizing member WL Reference water level

Claims (12)

A water storage tank having a storage space capable of storing water, and having a separation wall for separating the storage space;
The separation wall
An opening that communicates one space separated by the separation wall and the other space is formed,
The separation wall is
A flap for opening and closing the opening;
The flap
It is possible to swing between a closed state in which the upper end approaches the separation wall and closes the opening, and a communication state in which the upper end swings toward the one space side so as to leave the separation wall and opens the opening. Because
When the water level in the one space is equal to or lower than the water level in the other space, the communication state is maintained, and when the water flow from the one space to the other space occurs, the blocking state is established. A water tank characterized by being provided in. The flap is
2. The swing center is disposed so as to be positioned between an upper end portion and a lower end portion of the flap and between an upper end portion and a lower end portion of the opening. The described water tank. The flap is
3. The water storage tank according to claim 1, wherein, in the shut-off state, the water tank is provided so as to be inclined to the one space side with respect to a vertical direction. The flap is
4. The water storage tank according to claim 1, wherein the water storage tank is provided so as to be inclined upward with respect to a horizontal direction in the communication state. The water tank is
The said one space in the said storage space is connected in the sea, and the said other space is connected with the drain outlet of the drainage means which discharges | emits water outside from this other space. The water tank according to 2, 3 or 4. The water tank is
An operation confirmation mechanism provided at an upper portion of the opening in the separation wall;
The operation confirmation mechanism is
A connecting portion that can be connected to and detached from the flap;
Tension means for pulling the connecting portion toward the opening of the separation wall;
6. The water storage tank according to claim 1, further comprising urging means for urging the connecting portion in a direction away from the opening of the separation wall. A gate that communicates and blocks an opening that communicates with a pair of spaces in which liquid is stored;
The gate
A flap for opening and closing the opening;
The flap
It swings between a closed state in which the upper end approaches the opening and closes the opening, and a communication state in which the upper end swings toward one space side of the pair of spaces so as to leave the opening and opens the opening. Movable,
When the liquid level in the one space is equal to or lower than the liquid level in the other space, the communication state is maintained, and when the flow of liquid from the one space toward the other space occurs, the blocking state The flap gate is characterized by being provided. The flap is
8. The swing center is disposed so as to be positioned between an upper end portion and a lower end portion of the flap and between an upper end portion and a lower end portion of the opening. The described flap gate. The flap is
9. The flap gate according to claim 7, wherein the flap gate is provided so as to be inclined toward the one space side with respect to a vertical direction in the blocking state. The flap is
10. The flap gate according to claim 7, wherein the flap gate is provided so as to be inclined upward with respect to a horizontal direction in the communication state. It has an operation confirmation mechanism installed at the top of the opening,
The operation confirmation mechanism is
A connecting portion that can be connected to and detached from the flap;
Tension means for pulling the connecting portion toward the opening;
The flap gate according to claim 7, further comprising: an urging unit that urges the connecting portion in a direction away from the opening. A main body with an opening formed therein;
A flap provided on the main body,
The flap
A weir with a gate, which is the flap according to any one of claims 7 to 11.