JP2019112860A - Hydraulic control device - Google Patents

Abstract

To provide a hydraulic control device for a forcibly opened-type gate which can usually obtain high drainage property by holding a door body in an open state and in which a door body becomes in a closed state by self weight when a downstream side is equal to or higher than a predetermined water level, to securely stop water.SOLUTION: A hydraulic control device for a forcibly opened-type gate comprises: a hydraulic cylinder S including a rod R moving in conjunction with supply and discharge of a hydraulic oil; a door body G opening and closing in conjunction with movement of the rod R; a hydraulic oil supply pipe K1; a hydraulic oil discharge pipe K2; a supply valve B1; a discharge valve B2; a communication pipe K3 making one side of the hydraulic cylinder S communicate with the other side; and a float valve B3 provided in the communication pipe K3 and becoming in an open state when a downstream side water level is equal to or higher than a predetermined water level.SELECTED DRAWING: Figure 1

Description

  The present invention is used as a switchgear of a lift gate facility installed at the exit of a general lock or flow channel, or installed at a water gate of a seawall for emergency closing when a high wave or a tsunami strikes The present invention relates to a hydraulic control system of a forced open type gate which can be used.

In the past, a flap gate etc. was installed at the outlet of a common lock or flow channel for the purpose of preventing backflow from the downstream side, and a lift gate that closes the floodgate of a tide embankment in anticipation of high waves and tsunami. Is installed.
However, since the conventional flap gate is installed with the door suspended from the hanging hardware, since the water passage is normally closed, drainage performance is low, dust and the like are easily pinched, and incomplete closure failure As the door shakes due to waves etc., there is a problem that it is difficult to stop water reliably.
In addition, although the lift gate that closes in anticipation of high waves and tsunami is closed by forecasting and detection of seismic waves in advance, it is not always the case that high waves and tsunami occur, so useless closing and subsequent opening Actions may be taken.

  Therefore, as described in Patent Document 1 (Japanese Patent No. 4989032, particularly, paragraph 0007), the applicant applied the relief type which enables the implementation of the automatic lodging and the automatic standing operation according to the water level state of the water channel. To develop an automatic operation control circuit of automatic gate equipment and switch from an automatic operation state to a forced open / close operation state as described in Patent Document 2 (see Patent No. 5672559, particularly paragraphs 0010 and 0035) We have developed a hydraulic control circuit for a gated automatic gate system that can maintain the automatic operation control function even if the hydraulic control device or the operating hydraulic piping is damaged or lost.

  Further, in the hydraulic opening and closing device of the tide door disclosed in Patent Document 3 (Japanese Patent No. 6147591), when the water level on the sea side rises and the float rises, the float type switching valve is switched to the closing position. The hydraulic pressure of the accumulator is supplied to the forward side of the hydraulic cylinder so that the tide door is automatically closed (see, in particular, paragraphs 0013 to 0014).

Patent No. 4989032 Patent No. 5672559 Patent No. 6147591 gazette

However, since the undulating automatic gate installations described in Patent Documents 1 and 2 both use the lower hinge type floating gate type, the riverbed drop height (step) is larger than that of the conventional flap gate. There is a problem that it is difficult to apply to small-sized equipment, the conditions for equipment installation are severe, and equipment installation costs tend to be expensive.
Further, in the hydraulic opening / closing device of the tide door disclosed in Patent Document 3, the hydraulic door of the accumulator is closed by supplying the hydraulic pressure of the accumulator to the hydraulic cylinder. There was a danger that the door could not be closed.
The object of the present invention is to solve such problems, and usually keep the door open to obtain high drainage performance, and when the downstream side reaches a predetermined water level or more, the float type switching valve This is to provide a hydraulic control device of a forced open type gate which can shut the door closed by its own weight and reliably stop water by switching to the closed door position.

The invention according to claim 1 is
A hydraulic control device of a forced opening type gate which is closed by its own weight,
A hydraulic cylinder (S) having a rod (R) that moves in conjunction with the supply and discharge of hydraulic fluid;
A door (G) that opens and closes in conjunction with the movement of the rod (R);
A hydraulic oil supply pipe (K1) for supplying hydraulic oil from one side of the hydraulic cylinder (S);
A hydraulic oil discharge pipe (K2) for discharging hydraulic oil from the other side of the hydraulic cylinder (S);
A supply valve (B1) provided in the hydraulic oil supply pipe (K1);
A discharge valve (B2) provided in the hydraulic oil discharge pipe (K2);
A communicating pipe (K3) which causes one side and the other side of the hydraulic cylinder (S) to communicate with each other;
A float valve (B3) is provided which is provided in the communication pipe (K3) and which is opened when the water level on the downstream side of the forced opening gate reaches a predetermined water level or more.

  The invention according to claim 2 is the hydraulic control device according to claim 1, wherein the hydraulic oil is supplied through the supply valve (B1) and the hydraulic fluid is discharged through the discharge valve (B2). A hydraulic operating device (D) for receiving oil is provided, and the hydraulic operating device (D) is detachably connectable to the supply valve (B1) and the discharge valve (B2). I assume.

  The invention according to claim 3 is the hydraulic control device according to claim 1 or 2, wherein the communication pipe (K3) is closer to the hydraulic cylinder than the supply valve (B1) of the hydraulic oil supply pipe (K1), It is characterized in that the hydraulic cylinder side is communicated with the hydraulic cylinder from the discharge valve (B2) of the hydraulic fluid discharge pipe (K2).

  The invention according to claim 4 relates to the hydraulic control device according to any one of claims 1 to 3, wherein the forced opening type gate is any of an upper hinge type flap gate, an elevating type gate and a miter gate. It features.

According to the invention of claim 1, when the hydraulic oil is supplied and discharged so that the door (G) is in the open state of the hydraulic cylinder (S), the supply valve (B1), the discharge valve ( By closing all of B2) and the float valve (B3), the door (G) can be held in the open state, so that high drainage performance can be obtained even when the water level is low.
In addition, the float valve (B3) is provided in the communication pipe (K3) that brings one side and the other side of the hydraulic cylinder (S) into communication, and when the water level on the downstream side of the forced opening gate becomes a predetermined water level or more. Since the door (G) is in the open state, the door (G) can be closed and the water can be reliably stopped without any special operation.
Furthermore, since the door (G) moves in the closing direction by its own weight, the hydraulic oil can not be supplied due to the effects of high waves, earthquakes, etc., the hydraulic oil supply pipe (K1), the hydraulic oil discharge pipe (K2) and communication Even when the pipe (K3) is broken, the door (G) is closed, and it is possible to stop the backflow water caused by high waves and tsunami.

  According to the invention of claim 2, in addition to the effects of the invention of claim 1, the hydraulic oil is supplied through the supply valve (B1) and discharged through the discharge valve (B2). A hydraulic control device (D) for receiving hydraulic fluid is provided, and the hydraulic control device (D) can be detachably connected to the supply valve (B1) and the discharge valve (B2). It is possible to prevent the piping and the like of the operation device (D) from being destroyed by an earthquake or a tsunami.

  According to the invention of claim 3, in addition to the effect of the invention of claim 1 or 2, the communication pipe (K3) is closer to the hydraulic cylinder than the supply valve (B1) of the hydraulic oil supply pipe (K1). The hydraulic oil supply pipe (K1), the hydraulic oil discharge pipe (K2), and the communication pipe (K3) are compact because the hydraulic oil discharge pipe (K2) is communicated with the hydraulic cylinder side from the discharge valve (B2). can do.

  According to the invention of claim 4, in addition to the effect of the invention of any of claims 1 to 3, the forced opening type gate is any of an upper hinge type flap gate, an elevation type gate and a miter gate. Therefore, it is possible to easily procure a forced open gate which is closed by its own weight.

The figure which shows the outline | summary of this invention. The perspective view (when open) of the upper hinge type flap gate concerning Example 1. FIG. The perspective view of the upper hinge type flap gate which concerns on Example 1 (at the time of closing). The figure which shows the state of the hydraulic control apparatus etc. which concern on Example 1 (at the time of open | release). FIG. 2 is a view showing a state of a hydraulic control device and the like according to Embodiment 1 (at the time of closing). The figure which shows the state of the hydraulic control apparatus etc. which concern on Example 1 (at the time of automatic opening action). FIG. 6 is a view showing a gate operating state in which the door 1 is opened in the first embodiment. A seawall provided with an upper hinged flap gate according to a second embodiment. The enlarged view of upper hinge type flap gate vicinity concerning Example 2. FIG. The figure which shows the state of the hydraulic control apparatus etc. which concern on Example 2 (at the time of open | release). The figure which shows the state of the hydraulic control apparatus etc. which concern on Example 2 (at the time of closing). The figure which shows the gate operation state which opens the door 1 in Example 2. FIG. The enlarged view of the raising / lowering type gate vicinity which concerns on Example 3. FIG. The figure which shows the state of the hydraulic control apparatus etc. which concern on Example 3 (at the time of open | release).

FIG. 1 is a diagram showing an outline of the present invention.
As shown in FIG. 1, the present invention comprises a door (G) of an upper hinge type flap gate which is closed by its own weight and a hydraulic operating device for opening and closing the door (G).
Then, the hydraulic operating device is a dual rod type hydraulic cylinder (S) having a rod (R) moving in conjunction with the supply and discharge of the hydraulic oil, and an operation to supply the hydraulic oil from one side of the hydraulic cylinder (S) An oil supply pipe (K1), a hydraulic oil discharge pipe (K2) for discharging hydraulic oil from the other side of the hydraulic cylinder (S), and a supply valve (B1) provided in the hydraulic oil supply pipe (K1); A discharge valve (B2) provided in the hydraulic oil discharge pipe (K2) and a valve for discharge of the hydraulic cylinder side and the hydraulic oil discharge pipe (K2) from the supply valve (B1) of the hydraulic oil supply pipe (K1) B2) A float valve that is provided in the communication pipe (K3) that communicates with the hydraulic cylinder side and the communication pipe (K3), and is opened when the water level on the downstream side of the upper hinged flap gate reaches a predetermined water level (B3) is provided.
The hydraulic oil supply pipe (K1) and the hydraulic oil discharge pipe (K2) receive the hydraulic oil supplied to the hydraulic oil supply pipe (K1) and receive the hydraulic oil discharged from the hydraulic oil discharge pipe (K2). For this purpose, an operating hydraulic device (D) consisting of a pump and a hydraulic tank is connected.
Further, although in FIG. 1 the hydraulic device for operation (D), the supply valve (B1) and the discharge valve (B2) are arranged near the hydraulic cylinder (S), these are disposed on the dike or It may be placed at a safe position on the land side from the dike.

FIG. 1 (1) shows a gate open operation state when the closed door (G) is opened.
In this state, the supply valve (B1) and the discharge valve (B2) are opened, the float valve (B3) is closed, and the operating hydraulic device (D) to one side of the hydraulic cylinder (S) While the hydraulic oil is supplied to the hydraulic cylinder (S), the hydraulic oil is discharged from the other side of the hydraulic cylinder (S) to the operating hydraulic device (D).
Then, the rod (R) moves to the other side, and the door (G) is pulled up by the link mechanism to be in an open state.
When the supply valve (B1) and the discharge valve (B2) are set to the closed state after the open state, the hydraulic oil can not move and the rod (R) does not move, as shown in FIG. 1 (2) It will be in the gate open holding state.

Under normal conditions, since the state shown in FIG. 1 (2) is maintained, drainage from the upstream side flows downstream without receiving any resistance.
However, when the water level on the downstream side becomes higher than the predetermined water level due to high waves, tsunami, etc., the float not shown in FIG. 1 rises, and the float valve (B3) is opened. ing.
Then, when the float valve (B3) is opened, one side and the other side of the hydraulic cylinder (S) are connected via the communicating pipe (K3), and the hydraulic oil on both sides becomes movable. (G) descends by its own weight, and the gate is closed as shown in FIG. 1 (3).

2 is a perspective view of the upper hinge type flap gate in the gate open holding state, and FIG. 3 is a perspective view of the upper hinge type flap gate in the state where the gate open holding state is released and the door 1 is closed.
In the upper hinge type flap gate according to the first embodiment, as shown in FIGS. 1 and 2, the door 1 is pivotable by the hinge hardware 6 at the boundary between the water channel 2 a on the upstream side and the water channel 2 b on the downstream side. It is suspended and in the state where no external force acts, the outlet of the water channel 2a is closed by its own weight.
Further, the door driving arm 1 a is provided at the upper portion of the door 1 and is hinged to the end fitting 3 c provided at the tip of the rod of the double rod hydraulic cylinder 3, so the double rod hydraulic cylinder 3 is By driving the door 1, the door 1 can be operated to open and close.
Incidentally, the both-rod type hydraulic cylinder 3 is swingably attached to the trunnion type bearing 7, and the position of the metal tip 3c can be controlled by a hydraulic operating device described later.

FIG. 4 is a view showing the state of the hydraulic operating device and the gate in the gate open holding state.
The front oil port 3a of the double rod hydraulic cylinder 3 is connected to the hydraulic tank 18 by the hydraulic oil supply pipe via the second stop valve 13, the flow regulator 14, the pilot check valve 15, the flow direction control valve 16 and the hydraulic pump 17. The rear oil port 3b of the both rod hydraulic cylinders 3 is connected to the hydraulic tank 18 by a hydraulic oil discharge pipe via the flow regulator 14, the pilot check valve 15, and the flow direction control valve 16.
Further, the hydraulic oil supply pipe is connected by a communication pipe via the float valve 4b before and after the second stop valve 13, and a portion closer to the flow regulator 14 than the second stop valve 13 and the hydraulic oil discharge pipe A portion closer to the both rod type hydraulic cylinders 3 than the flow regulator 14 is connected by a communication pipe via the flow control valve 11 and the first stop valve 12.
Then, in the gate open holding state, the rods of both the rod type hydraulic cylinders 3 are contracted most, the first stop valve 12 is open, and the second stop valve 13 and the pilot check valve 15 are closed. (The flow direction control valve 16 is neutral).
In the gate open holding state, the second stop valve 13 and the pilot check valve 15 are closed, and the float valve 4b prevents movement of the hydraulic fluid from the left side to the right side of FIG. The hydraulic fluid can not move to the oil port 3b, and the door 1 does not move in the closing direction.
However, since the first stop valve 12 is open and the float valve 4b does not block the movement of the hydraulic fluid from the right to the left in FIG. 4, the hydraulic fluid can move from the rear oil port 3b to the front oil port 3a, It is possible for the door 1 to move in the opening direction.

FIG. 5 is a view showing the state of the hydraulic operating device and the gate in the state where the gate open holding state is released and the door 1 is closed.
Release of the gate open holding state is achieved by raising the water level 19b of the water channel 2b from the state of FIG. 4 and raising the float 4a and opening the float valve 4b, and then the door 1 is lowered by its own weight and closed. It becomes the state of 5.
That is, when the float 4a ascends in the direction of the arrow d and the float valve 4b opens, the hydraulic oil can flow out from the front oil port 3a, and the gate open holding state is released.
Then, when the gate open holding state is released, the tip metal 3c is pulled to the right by the own weight of the door 1, and the arrow a, the arrow c, the float valve 4b, the arrow c, the flow control valve 11, The hydraulic oil flows into the rear oil port 3b of the both-rod hydraulic cylinder 3 along the path of the first stop valve 12 and the arrow a, whereby the metal tip 3c moves and the door 1 descends, and the outlet of the water channel 2a Will be closed.
In the state shown in FIG. 5, when the water level of the water passage 2a exceeds the water level of the water passage 2b and the door 1 is pushed downstream by water pressure, as described above, the hydraulic oil is directed from the rear oil port 3b to the front oil port 3a. Because the door 1 can move to the opening direction, the door 1 can move in the opening direction and drain.

6, the water level 19b of the water channel 2b drops from the state of FIG. 5 (gate closed state), the float valve 4b is closed, the gate closed state is released, and the door 1 is in the state of automatic opening operation and It is a figure which shows the state of a gate.
In this automatic opening operation state, as in the state of FIG. 4, the second stop valve 13 and the pilot check valve 15 are closed, so that hydraulic oil can not be supplied to the front oil port 3a by the hydraulic pump 17.
However, even in the state of FIG. 6, the hydraulic oil is directed from the rear oil port 3b to the arrow A, the first stop valve 12, the flow control valve 11, the arrow O, the float valve 4b, the arrow O, the arrow O As the water level 19a of the water channel 2a exceeds the water level 19b of the water channel 2b and the door 1 is pushed downstream, the door 1 is opened by the amount of the pressure.
And since the hydraulic fluid can not move from the front oil port 3a to the rear oil port 3b as in the state of FIG. 4, the door 1 once opened does not move in the closing direction, and is pushed by water pressure. As a result, the open state of the door 1 is maintained.
Therefore, even if the opening operation of the door 1 is not performed after the float valve 4b is operated, the state in which drainage is difficult does not continue, and stable and continuous drainage is possible.

FIG. 7 is a view showing a gate operating state in which the door 1 is opened by the operating hydraulic device including the hydraulic pump 17, the hydraulic tank 18, and various valves.
In this gated state, the first stop valve 12 is closed, and the second stop valve 13 and the pilot check valve 15 are opened.
Therefore, when the hydraulic pump 17 is moved to supply the hydraulic oil from the hydraulic tank 18, the path of the arrow 、, flow direction control valve 16, pilot check valve 15, flow regulator 14, second stop valve 13, arrow 、, arrow カThe hydraulic oil flows into the front oil port 3a, and the hydraulic oil is discharged from the rear oil port 3b to the hydraulic tank 18 in the path of the arrow a, flow regulator 14, pilot check valve 15, flow direction control valve 16, and arrow key. Therefore, the metal tip 3c moves to the left, and the door 1 ascends to an open state.
When the door 1 is fully opened, the second stop valve 13 and the pilot check valve 15 are closed, and the first stop valve 12 is opened as shown in FIG.

FIG. 8 is a view showing the seawall 21 installed with the upper hinge type flap gate according to the second embodiment, FIG. 9 is an enlarged view in the vicinity of the upper hinge type flap gate, and FIG. FIG. 11 is a view showing the state, FIG. 11 is a view showing the state of the hydraulic operating device and the gate in a state where the gate open holding state is released and the door 1 is closed, FIG. 12 shows the hydraulic pump 17, the hydraulic tank 18 and various valves It is a figure which shows the gate operation state which connects the operation hydraulic apparatus 10 which becomes this to the supply connection port 14a and the discharge connection port 14b, and opens the door 1 using the operation hydraulic apparatus 10. FIG.
Also in the second embodiment, both the rods attached to the trunnion type bearing 7 in that the door 1 is rotatably suspended by the hinge hardware 6 at the boundary between the water channel 2a on the upstream side and the water channel 2b on the downstream side. The door 4 can be opened and closed by driving the hydraulic cylinder 3. The float 4a and the float valve 4b are provided. When the water level 19c on the sea side rises, the float 4a rises and the float valve The point 4b is opened and the door 1 descends by its own weight to close the outlet of the water channel 2a is the same as the first embodiment.
Further, the difference from the first embodiment is that the operation hydraulic device 10 including the pilot check valve 15, the flow direction control valve 16, the hydraulic pump 17, the hydraulic tank 18 and the like for supplying and discharging the hydraulic oil is attached and detached. A hydraulic circulation device 9 having a supply connection port 14 a and a discharge connection port 14 b for connecting the operation hydraulic device 10 freely and being freely provided is provided near the double rod hydraulic cylinder 3. .
Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and in the following, differences from the first embodiment will be mainly described.

As shown in FIG. 9, the float 4a, the float valve 4b and the hydraulic circulation device 9 are installed above the upper hinge type flap gate, and the float valve 4b and the hydraulic circulation device 9 are holes and recesses provided in the support structure 22. It is housed inside.
In addition, the float valve 4 b and the hydraulic circulation device 9 may be inspected on the support structure 22 or opened when connecting the operating hydraulic device 10 to the hydraulic circulation device 9 on the hole and the recess. Capable lids 23 and 24 are attached.
Although not shown, a pipe for moving hydraulic oil of the both-rod hydraulic cylinder 3 is provided in the support structure 22.

The state of the hydraulic operating device and the gate in the gate open holding state is as shown in FIG. 10, and the hydraulic oil is supplied from the front oil port 3a to both rod type hydraulic cylinders 3 and from the rear oil port 3b both rod type hydraulic cylinders 3 After the internal hydraulic fluid is drained and the door 1 is fully opened, the second stop valve 13 is closed and the first stop valve 12 is opened.
Further, the water level 19c on the sea side rises from the state shown in FIG. 10, the float 4a rises, the float valve 4b is opened, the gate open holding state is released, and the door 1 is closed. The state is as shown in FIG.
The movement of the hydraulic fluid in the gate open holding state and the gate closed state, that is, the operation of the door 1 and the both-rod hydraulic cylinder 3 is the same as the description of FIG. 4 and FIG. The water level 19c on the sea side drops from the closed state (state of FIG. 11), the float valve 4b is closed, the gate closed state is released, and the movement of the hydraulic oil in the state where the door 1 is automatically opened. , Etc. are the same as the description of FIG. 6 of the first embodiment.

When the door 1 is opened from the state of FIG. 11 in the second embodiment, the lid 24 is opened, and the operating hydraulic device is connected to the supply connection port 14a and the discharge connection port 14b installed on the upper portion of the hydraulic circulation device 9. 10 is connected, the first stop valve 12 is closed, the second stop valve 13 is opened, and the hydraulic pump 17 is operated after the state shown in FIG.
When hydraulic oil is supplied by the operation of the hydraulic pump 17, the arrow force, flow direction control valve 16, pilot check valve 15, flow regulator 14, arrow force, supply connection port 14a, second stop valve 13, arrow mark A The hydraulic fluid flows into the front oil port 3a along the path of the rear oil port 3b, and from the rear oil port 3b, the outlet port 14b, the outlet port 14b, the arrow key, the flow regulator 14, the pilot check valve 15, the flow direction Since hydraulic oil is discharged to the hydraulic tank 18 in the path, the metal tip 3c moves upward, and the door 1 ascends in the direction of the arrow U to be in an open state.
When the door 1 is fully opened, the second stop valve 13 is closed and the first stop valve 12 is opened, and then the operating hydraulic device 10 is removed, resulting in the state shown in FIG.

FIG. 13 is an enlarged view of the vicinity of the elevation gate of the seawall on which the elevation gate according to the third embodiment is installed, and FIG. 14 is a diagram showing the hydraulic operating device and the gate in the open state.
In the third embodiment, the door 1 of the second embodiment is replaced with the door 31 of a lift gate, and the door 31 is not suspended by the hinge fitting 6, and the door drive arm 1a and the tip fitting 3c The only difference is that it is suspended by means of the hinge connection and the guide hardware 32 for guiding the door 31 is provided.
Therefore, the movement of the hydraulic oil in each state, that is, the operation of the door 1 and the both-rod hydraulic cylinder 3 will not be described, but the lift gate may be automatically opened by water pressure once it is closed. Although not shown, a hinge-type gate which is opened by the pressure of drainage is provided in a part of the door 31 because it is not shown.

The modification of Examples 1-3 is listed.
(1) A communication pipe is provided on the hydraulic cylinder side from the flow regulator 14 of the hydraulic oil supply pipe and the hydraulic oil discharge pipe and the pilot check valve 15 in the first embodiment, and in the second and third embodiments, the hydraulic oil supply pipe and the hydraulic oil discharge pipe A communication pipe is provided on the hydraulic cylinder side from the supply connection port 14a and the discharge connection port 14b, but the front oil port 3a and the rear oil port 3b are directly communicated separately from the hydraulic oil supply pipe and the hydraulic oil discharge pipe. A communication pipe may be provided.
(2) In the first and second embodiments, the upper hinge type flap gate is used, and in the third embodiment, the elevating type gate is used. However, in any of the embodiments, the miter gate is a forced open type gate which is closed by its own weight. Any gate may be used.

(3) The hydraulic oil supply pipe and the hydraulic oil discharge pipe of the second and third embodiments are not provided with a valve for separating the hydraulic operating device, but the supply connection port 14a installed in the hydraulic circulation device 9 Since the discharge connection port 14b plays the same role, the supply valve and the discharge valve in the claims respectively include the supply connection port 14a and the discharge connection port 14b.

1 door body 2a upstream water channel 2b downstream water channel 3 double rod hydraulic cylinder 3a front oil port 3b rear oil port 3c tip hardware 4a float 4b float valve 5 door contact metal 6 hinge hardware 7 trunnion bearing 9 hydraulic circulation system DESCRIPTION OF SYMBOLS 10 Operation hydraulic system 11 Flow control valve 12 1st stop valve 13 2nd stop valve 14 Flow regulator 14a Supply connection port 14b Discharge connection port 15 Pilot check valve 16 Flow direction control valve 17 Hydraulic pump 18 Hydraulic tank 19a Water level 19b Water level 2b Water level 19c Water level on the sea side 21 Seawall 22 Support structure 31 Lifting gate door 32 Guide hardware B1 Supply valve B2 Discharge valve B3 Float valve D Operating hydraulic unit G Door K1 Hydraulic oil supply pipe K2 Hydraulic oil discharge pipe K3 Connecting pipe R S hydraulic cylinder

Claims (4)

A hydraulic control device of a forced opening type gate which is closed by its own weight,
A hydraulic cylinder having a rod that moves in conjunction with supply and discharge of hydraulic fluid;
A door that opens and closes in conjunction with the movement of the rod;
A hydraulic oil supply pipe for supplying hydraulic oil from one side of the hydraulic cylinder;
A hydraulic oil discharge pipe for discharging hydraulic oil from the other side of the hydraulic cylinder;
A supply valve provided in the hydraulic oil supply pipe;
A discharge valve provided in the hydraulic oil discharge pipe;
A communicating pipe that causes one side and the other side of the hydraulic cylinder to communicate with each other;
A hydraulic valve control device for a forcibly open gate, comprising: a float valve provided in the communication pipe and opened when a water level downstream of the forcibly open gate reaches a predetermined water level or more. An operating hydraulic system is provided that supplies hydraulic fluid through the supply valve and receives hydraulic fluid discharged through the discharge valve.
The hydraulic control device according to claim 1, wherein the operating hydraulic device is detachably connectable to the supply valve and the discharge valve. 3. The communication pipe according to claim 1, wherein a hydraulic cylinder side of the supply valve of the hydraulic fluid supply pipe and a hydraulic cylinder side of the discharge valve of the hydraulic fluid discharge pipe communicate with each other. Hydraulic control device. The hydraulic control device according to any one of claims 1 to 3, wherein the forced opening type gate is any of an upper hinge type flap gate, an elevating type gate and a miter gate.