JP7148430B2 - undulating gate breakwater - Google Patents

Description

The present application relates to an undulating gate breakwater.

For example, Patent Literature 1 discloses an undulating gate type breakwater provided in the sea as a countermeasure against tsunamis, storm surges, and the like. The undulating gate type breakwater of Patent Literature 1 is provided with a stopper device that prevents the upright gate from falling down due to the force of the undertow.

In the above-described stopper device, the support rod (hereinafter referred to as a restraining rod) stands up due to buoyancy and comes into contact with the fallen door to prevent it from falling. As the blocking rod stands up, the proximal end of the fixed rod, whose distal end is rotatably connected to the blocking rod, is guided by the guide rail and moves toward the blocking rod. Then, the fixed hook is hooked to the proximal end of the fixed rod that has moved. As a result, the stopping rod is locked and is prevented from falling down. Also, by pulling the rope, one end of which is connected to the blocking rod, by the winch, the fixed hook is first released. After that, as the proximal end of the fixed rod is guided by the guide rail and moves in the direction opposite to the above, the stopping rod falls from the upright state.

Japanese Patent No. 5059696

By the way, in the above-described stopper device, there is a fear that the force required to lay down the stop rod is increased. That is, the motion resistance of the stay (fixed rod or guide rail) increases due to the influence of deposits and aging deterioration, so that the force required to lay down the stop rod increases.

The technology disclosed in the present application has been made in view of such circumstances, and its object is to provide an undulating gate type breakwater that can reduce the force required for lodging the stop rod of the stopper device.

The technology disclosed in the present application is provided in water, and includes a door body that rotates about a rotation shaft on the base end side by buoyancy from a collapsed state and stands up, and a stopper device that prevents the collapsed movement of the door body. The target is a rolling gate type breakwater.

The stopper device includes a stop rod, a hook, a hook, a drive, and a transmission mechanism. The restraining rod is provided below the door body in the fallen state, rotates around a pivot shaft on the base end side due to buoyancy, and stands up. It restrains the lodging motion. The hook is rotatably mounted on the stopping rod. When the blocking rod is erected, the hanging portion is hooked by the hook so that the blocking rod is held in the erected state. The drive unit generates a tensile force that causes the stop rod to fall down.

The transmission mechanism is provided on the stop rod. The transmission mechanism has an operating member and a blocking portion. The operating member is connected to the hook, and rotates the hook by the action of the tensile force of the driving portion to release the hook. The blocking portion prevents the hook from rotating by the operating member after the hook is released, thereby causing the tensile force acting on the operating member to act on the blocking rod. to fall over.

According to the undulating gate type breakwater of the present application, the force required to lodge the stop rod of the stopper device can be reduced.

FIG. 1 is a diagram showing a schematic configuration of an undulating gate type breakwater according to an embodiment. FIG. 2 is a diagram showing a state in which the falling motion of the gate body is restrained by the stopper device in the undulating gate type breakwater according to the embodiment. FIG. 3 is a diagram showing a collapsed state of the stopper device according to the embodiment. FIG. 4 is a diagram showing a state in which the stopper device according to the embodiment is being raised. FIG. 5 is a diagram showing a raised state of the stopper device according to the embodiment. FIG. 6 is a diagram showing a state in which the hook is released from the stopper device according to the embodiment. 7A and 7B are diagrams showing the schematic configuration of the transmission mechanism of the stopper device according to the embodiment, in which (a) shows the state when the hook is engaged, and (b) shows the state when the hook is released. Indicates status. FIG. 8 is a diagram showing a state before the completion of falling of the stopper device according to the embodiment. FIG. 9 is an enlarged view of the tip of the restraining rod when the door body is restrained from falling down.

Hereinafter, embodiments of the present application will be described with reference to the drawings. The following embodiments are essentially preferred examples, and are not intended to limit the scope of the technology disclosed in the present application, its applications, or its uses.

The undulating gate type breakwater 1 of the present embodiment is provided in harbors, for example, as a countermeasure against tsunamis and storm surges. As shown in FIG. 1, an undulating gate type breakwater 1 (hereinafter also referred to simply as breakwater 1) is a so-called movable breakwater installed at an opening of a fixed breakwater (not shown).

As also shown in FIG. 2 , the breakwater 1 includes a door 10 , a storage section 20 and a stopper device 30 . 1 and 2, the left side is outside the port, the right side is inside the port, and a part of the stopper device 30 is omitted.

The door 10 is formed in a slightly flattened, substantially rectangular shape, and has a pivot shaft 11 on the base end side (right end in FIG. 1). The door body 10 is provided in the water (in the sea), and rotates about the rotation shaft 11 by buoyancy from the fallen state to stand up (float). The gate body 10 prevents water from entering the harbor from outside the harbor by standing up.

The storage part 20 is provided below the door body 10 in the collapsed state. The storage unit 20 is provided on the seabed and has a substantially rectangular shape. The storage part 20 is stored with the door 10 in a fallen state. The tip portion 12 of the door body 10 in the fallen state is moored by a mooring mechanism (not shown), and the door body 10 stands up when the mooring is released. The door body 10 is moored so as to be swingable by waves.

The stopper device 30 prevents the door 10 from falling down. As shown in FIG. 2, for example, when the upright door 10 falls down due to the force of the undertow, the stopper device 30 comes into contact with the door 10 to stop the door 10 from falling down. As a result, the gate body 10 is maintained at a predetermined standing angle, and the minimum water level inside the harbor during undertow is ensured.

As shown in FIG. 3 , the stopper device 30 includes a stop rod 31 , a hook 33 , a hook portion 34 , a transmission mechanism 35 and a drive portion 40 . In addition, FIG. 3 shows the state of the door 10 when it is laid down.

The blocking rod 31 , the hook 33 , the hooking portion 34 and the transmission mechanism 35 are provided inside the storage portion 20 . That is, the stop rod 31 and the like are provided below the door 10 in the fallen state.

The restraining rod 31 rotates around a pivot shaft 31a on the base end side by its own buoyancy to stand up, and restrains the falling motion of the door body 10 when the falling door body 10 comes into contact with it. The stop rod 31 is rotatably connected at its proximal end to a frame 32 provided in the storage section 20 .

The restraining rod 31 is configured such that the tip 31b contacts the lower surface 13 of the door 10 in the fallen state, thereby restraining the upright movement due to buoyancy. Further, the restraining rod 31 is configured to stand up by its own buoyancy as the door body 10 stands up from the fallen state. The blocking rod 31 has a cushioning material 31d and a rolling part 31e.

31 d of buffer materials are provided in the front-end|tip surface 31c of the restraint rod 31, and are resin-made members, for example. 31 d of cushioning materials are members which restrain the lodging operation|movement of the door 10, when the door 10 which falls down contacts (refer FIG. 9). Since the door 10 is restrained by the cushioning material 31d in this way, the impact at the time of restraining is alleviated.

The rolling portion 31 e is provided at the tip portion 31 b of the stopping rod 31 . The rolling portion 31e is provided on the outer peripheral surface of the restraining rod 31 via a mounting member 31f, and is, for example, a roller.

The rolling portion 31e is a member that contacts the lower surface 13 of the door 10 when the door 10 is laid down. In this way, the rolling portion 31e contacts the lower surface 13 of the door 10 in the fallen state, thereby preventing the cushioning material 31d from coming into contact with the lower surface 13 of the door 10. is inhibited (see FIG. 3).

The rolling portion 31e is in rolling contact with the lower surface 13 of the door 10 . The restraining rod 31 is configured such that the rolling portion 31e rolls on the lower surface 13 of the door 10 when the stopping rod 31 is erected as the door 10 is erected.

The hook 33 is rotatably provided on the blocking rod 31 . The hook 33 rotates around the base end portion 33a.

The hook portion 34 is a portion on which the hook 33 is hooked when the stopping rod 31 is erected. The hooking portion 34 is, for example, a shaft member provided on the base 32, and the hook 33 is automatically hooked when the stopping rod 31 completes the erecting motion. By hooking the hook 33 on the hook 34, the restraining rod 31 is prevented from falling down, and the upright state is maintained.

The transmission mechanism 35 is provided on the blocking rod 31 and transmits the tensile force of the driving portion 40 to the blocking rod 31 . As shown in FIG. 7, the transmission mechanism 35 has first and second levers 36, 37, a torque shaft 38, a turnbuckle 39a, and two connecting rods 39b, 39c as operating members. The operation member is connected to the hook 33, and rotates the hook 33 to release the hook 33 when a tensile force of the drive unit 40, which will be described later, acts.

The first and second levers 36 , 37 are connected via a torque shaft 38 . More specifically, the first lever 36 has one end connected to a rope (a second rope 51) of the drive unit 40, which will be described later, and a torque shaft 38 connected substantially in the center. The second lever 37 has a proximal end connected to a torque shaft 38 and a distal end connected to a connecting rod 39b. The torque shaft 38 extends in a direction perpendicular to the direction of the axial center X (see FIG. 9) of the stop rod 31 . The first and second levers 36 and 37 are configured to rotate in conjunction with each other about a torque shaft 38 .

The first lever 36 rotates when a tensile force acts from the second rope 51 , and the second lever 37 rotates in conjunction with the rotation of the first lever 36 . In other words, the first and second levers 36 and 37 constitute levers that are provided on the stop rod 31 and that rotate when the tensile force of the driving portion 40 acts thereon.

A turnbuckle 39 a and two connecting rods 39 b and 39 c are connected between the second lever 37 and the hook 33 . Specifically, one ends of two connecting rods 39b and 39c are screwed to both sides of the turnbuckle 39a. The other end of the connecting rod 39b is connected to the tip of the second lever 37, and the other end of the connecting rod 39c is connected to the hook 33. As shown in FIG.

That is, the turnbuckle 39a and the two connecting rods 39b and 39c are connected to the lever (second lever 37) and the hook 33, and rotate the hook 33 as the lever (second lever 37) rotates. It constitutes a connecting member for releasing the engagement of the hook 33 .

The transmission mechanism 35 further has a blocking portion 36a. After the hook 33 is released, the blocking portion 36a blocks the rotation of the hook 33 by the operating member, thereby causing the tensile force acting on the operating member to act on the blocking rod 31, thereby causing the blocking rod 31 to move. It is to fall down.

More specifically, the blocking portion 36a is provided on the first lever 36 (lever). The blocking portion 36a is provided at the other end of the first lever 36 (the end opposite to the side to which the second rope 51 is connected). The blocking portion 36a is configured to block the rotation of the first lever 36 (lever) by coming into contact with the blocking rod 31 when the first lever 36 (lever) rotates (FIG. 7B). )reference).

That is, the blocking portion 36 a is configured to block the rotation of the second lever 37 and the rotation of the hook 33 by blocking the rotation of the first lever 36 .

The driving portion 40 generates a tensile force that causes the stopping rod 31 to fall down. The drive unit 40 has ropes (first rope 41 and second rope 51 ), a hoist 42 , a counterweight 46 and an elevating member 48 .

The first rope 41 has one end connected to the hoist 42 and the other end fixed to the wall via movable pulleys 43 and 45 and a fixed pulley 44 . The movable pulleys 43 and 45 are vertically movable. The counterweight 46 is provided on the movable pulley 45 and moves up and down together with the movable pulley 45 . The upper limit position of the counterweight 46 is limited by a stopper 47 .

The lifting member 48 is provided with the movable pulley 43 described above, and is configured to move up and down together with the movable pulley 43 . The second rope 51 has one end connected to the first lever 36 (operating member) and the other end connected to the lifting member 48 via fixed pulleys 52 and 53 . In the drive unit 40 , the hoist 42 winds the first rope 41 to apply a tensile force to the first lever 36 (operating member) via the second rope 51 . That is, the hoist 42 applies tensile force to the operating member by pulling the second rope 51 (rope) connected to the operating member.

Although not shown, two sets of the stop rod 31, the hook 33, and the transmission mechanism 35 are provided. In other words, one set of the stop rod 31 and the like is provided at both ends of the door 10 in the width direction. Two second ropes 51 are connected to the lifting member 48 and connected to each transmission mechanism 35 .

For example, the first rope 41 is a steel rope (wire rope), and the second rope 51 is a fiber rope.

<Operation of stopper device>
First, the erecting motion of the stop rod 31 will be described with reference to FIGS. 3 to 5. FIG.

As shown in FIG. 3, normally, when the door 10 is laid down, the stop rod 31 is pushed down by the door 10 and laid down. In other words, the rolling portion 31e of the stopping rod 31 is in contact with the lower surface 13 of the door 10, and the door 10 prevents the rising motion due to the buoyancy. At this time, the cushioning material 31d does not come into contact with the lower surface 13 of the door 10 because the rolling portion 31e is in contact with the lower surface 13 of the door 10 . The second rope 51 is tensioned by the counterweight 46 so as not to sag. Note that the hoist 42 is braked.

As shown in FIG. 4, in an emergency, the mooring by the mooring mechanism is released, and the door body 10 begins to stand up. At this time, the hoist 42 remains braked. As the door 10 rises, the stopping rod 31 rises (floats) by its own buoyancy. That is, the stop rod 31 follows the door 10 and stands up. At that time, the rolling portion 31c of the stopping rod 31 rolls against the lower surface 13 of the door 10. As shown in FIG. In other words, while the restraining rod 31 stands up from the fallen state, the rolling part 31e keeps contacting the lower surface 13 of the door 10 so that the cushioning material 31d does not contact the lower surface 13 of the door 10 . In the driving portion 40, the weight of the counterweight 46 is smaller than the lifting force of the stopping rod 31, so the counterweight 46 rises. As the counterweight 46 rises, the elevating member 48 descends.

As shown in FIG. 5, when the blocking rod 31 is completely erected, the hook 33 is caught by the hooking portion 34 and the blocking rod 31 is locked. In other words, the restraining rod 31 is prevented from falling down and the upright state is maintained. Although not shown, the door body 10 is also in the erected state (the state indicated by the dashed line in FIG. 1). This completes the upright motion of the stop rod 31 .

The door body 10 that has completed the erection falls down due to, for example, the undertow of a tsunami. Then, when the door 10 falls down to a predetermined standing angle, the door 10 comes into contact with the cushioning material 31d of the restraining rod 31, and the falling down operation is stopped (see FIG. 2). This ensures the minimum water level at the time of undertow inside the harbor.

As shown in FIG. 9 , the axis X of the stop rod 31 extends perpendicularly to the lower surface 13 of the door 10 when the door 10 is stopped from falling down by the stop rod 31 . In the stop rod 31, the position of the rolling part 31e in the direction of the axis X is closer to the rotation shaft 31a than the position of the cushioning member 31d. Therefore, when the falling motion of the door 10 is stopped, the door 10 contacts the cushioning material 31d but does not contact the rolling portion 31e. Therefore, it is possible to prevent damage or the like of the rolling portion 31e due to contact with the falling door 10. As shown in FIG.

Next, the lodging motion of the stop rod 31 will be described with reference to FIGS. 6 and 7. FIG.

As shown in FIG. 7( a ), in the transmission mechanism 35 with the hook 33 hooked on the hook 34 , the blocking portion 36 a is separated from the stopping rod 31 . As shown in FIG. 6 , the first rope 41 is wound by the winding machine 42 . Then, first, the counterweight 46 is raised and stopped at the upper limit position by the stopper 47 . That is, at the beginning of winding of the first rope 41, the pulling force of the hoist 42 is used to raise the counterweight 46. As shown in FIG.

Further, when the first rope 41 is wound by the winder 42, the lifting member 48 is lifted. Therefore, the tensile force of the hoist 42 acts on the first lever 36 of the transmission mechanism 35 via the second rope 51 .

As shown in FIG. 7(b), in the transmission mechanism 35, when the tensile force F from the second rope 51 acts on the first lever 36, the first and second levers 36 and 37 both move in the same direction (see FIG. 7(b)). ) in the solid arrow direction). When the second lever 37 rotates, the hook 33 is pulled and rotated by the connecting member described above, and the hook 33 is released. When the first and second levers 36 and 37 are further rotated by the tensile force F after the hook 33 is released, the blocking portion 36a comes into contact with the blocking rod 31 (state shown in FIG. 7(b)).

When the blocking portion 36a comes into contact with the blocking rod 31, rotation of the first and second levers 36, 37 and thus the hook 33 is blocked. In this state, when the first rope 41 is further wound by the hoist 42 , the tensile force acting on the first lever 36 from the second rope 51 acts on the stopping rod 31 . Then, the stop rod 31 is laid down. In other words, the stopping rod 31 falls down due to the tensile force of the hoist 42 acting from the second rope 51 via the first lever 36 .

In this manner, in the transmission mechanism 35, the tensile force of the hoist 42 (drive section 40) acts on the hook 33 from the state where the hook 33 is hooked on the hook section 34 until the blocking section 36a contacts the blocking rod 31. but does not act on the blocking rod 31. This is because the tensile force required to rotate the hook 33 is set smaller than the tensile force required to lay down the stop rod 31 .

In the transmission mechanism 35 , after the blocking portion 36 a contacts the blocking rod 31 , the tensile force of the hoist 42 (driving portion 40 ) acts on the blocking rod 31 and does not act on the hook 33 . That is, the tensile force of the hoist 42 acts directly on the stopping rod 31 from the first lever 36 and does not act on the torque shaft 38, the second lever 37 and the connecting members (turnbuckle 39a and connecting rods 39b, 39c). Therefore, it is possible to prevent the design load of the members such as the second lever 37 and the hook 33 from increasing more than necessary.

As shown in FIG. 7 , in the drive unit 40 , the first rope 41 is wound up by the hoist 42 until the stopping rod 31 once falls to a position lower than the normal lying position. Thus, when the stop rod 31 falls down to a predetermined position, the hoist 42 stops winding and is braked. Then, the door body 10 is laid down, and the door body 10 in the laid down state is moored by the mooring mechanism.

When the mooring of the door 10 is completed, the hoist 42 lets out the first rope 41 . Then, the stopping rod 31 stands up (floats) by its own buoyancy, and the rolling portion 31e comes into contact with the lower surface 13 of the door 10 and stops. In the driving portion 40, the first rope 41 is let out from the hoist 42 until the rolling portion 31e contacts the lower surface 13 of the door 10, and the lifting member 48 is lowered. Subsequently, after the first rope 41 is let out further from the hoisting machine 42 and the counterweight 46 is lowered to a predetermined position, the hoisting machine 42 is braked (state shown in FIG. 3). This completes the lodging motion of the stop rod 31 and the rising preparatory motion.

As described above, in the undulating gate type breakwater 1 of the above embodiment, the stopper device 30 includes the blocking rod 31, the hook 33, the hooking portion 34, the driving portion 40, and the transmission mechanism 35. The restraining rod 31 is provided below the door body 10 in the fallen state, and rotates about a pivot shaft 31a on the base end side by buoyancy to stand up. lodging motion. The hook 33 is rotatably provided on the blocking rod 31 . When the blocking rod 31 is erected, the hanging portion 34 is engaged with the hook 33 to maintain the standing state of the blocking rod 31 . The drive unit 40 generates a tensile force that causes the stop rod 31 to fall.

The transmission mechanism 35 has operation members (first and second levers 36 and 37, torque shaft 38, turnbuckle 39a, connecting rods 39b and 39c) and a blocking portion 36a, and is provided on the stop rod 31. . The operation member is connected to the hook 33, and rotates the hook 33 by applying the tensile force of the driving portion 40 to release the hook 33 from the engagement. After the hook 33 is released, the blocking portion 36a prevents the hook 33 from rotating by the operating member, thereby causing the tensile force acting on the operating member to act on the blocking rod 31 to cause the blocking rod 31 to fall down. It is.

According to the above configuration, the stopper device 30 is not provided with a stay portion unlike the conventional one, so that the resistance of the stopping rod 31 to fall down due to the influence of deposits or the like does not increase. Also, by applying a tensile force to the transmission mechanism 35, the hook 33 can be released, and then the tensile force can be applied to the stopping rod 31 to cause the stopping rod 31 to fall down.

Therefore, it is possible to release the hook 33 from the hook 33 without providing a conventional stay portion, and reduce the force required to bring down the stop rod 31 .

Further, in the undulating gate type breakwater 1 of the above embodiment, the operation member of the transmission mechanism 35 includes levers (first and second levers 36, 37) and connecting members (turnbuckle 39a, connecting rods 39b, 39c). have. The lever is provided on the stop rod 31 and is rotated by the tensile force of the driving portion 40 acting thereon. The connecting member is connected to the lever and the hook 33 , and rotates the hook 33 as the lever rotates to release the hook 33 . The blocking portion 36a of the transmission mechanism 35 is provided on the lever (first lever 36), and is configured to contact the blocking rod 31 when the lever rotates, thereby blocking the rotation of the lever. .

According to the above configuration, the blocking portion 36a provided on the lever (first lever 36) contacts the blocking rod 31 to block the rotation of the lever. movement can be blocked.

Further, in the undulating gate type breakwater 1 of the above-described embodiment, the stop rod 31 is configured such that the tip 31b contacts the lower surface 13 of the door 10 in the fallen state, thereby preventing the rising operation due to buoyancy. ing.

According to the above configuration, a mooring mechanism or the like for holding the stop rod 31 in the laid down state is not required. In addition, the stopping rod 31 can be raised along with the raising operation of the door 10 . Therefore, the stopping rod 31 can be completely erected sufficiently in time when the erected door body 10 falls down due to the undertow.

In addition, in the undulating gate type breakwater 1 of the above embodiment, the blocking rod 31 has a cushioning material 31d and a rolling part 31e. 31 d of buffer materials are provided in the front-end|tip surface 31c of the restraining rod 31, and restrain the lodging operation|movement of the door 10 when the door 10 which falls down contacts. The rolling portion 31e is provided at the tip portion 31b of the restraining rod 31, and contacts the lower surface 13 of the door 10 when the door 10 falls, thereby bringing the cushioning material 31d and the lower surface 13 of the door 10 into contact with each other. , and the erecting action due to the buoyancy of the stopping rod 31 is also stopped.

According to the above configuration, it is possible to prevent the cushioning material 31d from coming into contact with the lower surface 13 of the door 10 when the restraining rod 31 falls down and stands up. Therefore, it is possible to prevent damage to the cushioning material 31d due to contact or sliding with the lower surface 13 of the door 10. As shown in FIG. Further, when the blocking rod 31 is erected, the rolling portion 31e rolls against the lower surface 13 of the door 10, so that the resistance of the blocking rod 31 to the erecting motion can be reduced.

Further, in the hoisting gate type breakwater 1 of the above embodiment, the drive unit 40 includes a rope (second rope 51) connected to the operating member, and a hoist 42 that pulls the rope to apply tensile force to the operating member. have According to this configuration, it is possible to achieve the above-described effects with a simple configuration.

In addition, in the drive unit 40 of the above embodiment, a chain or the like may be used instead of the ropes (the first rope 41 and the second rope 51).

As described above, the technology disclosed in the present application is useful for undulating gate type breakwaters.

1 Lifting gate 10 Door body 11 Rotating shaft 13 Lower surface 30 Stopper device 31 Stop rod 31a Rotating shaft 31b Tip part 31c Tip face 31d Cushioning material 31e Rolling part 33 Hook 34 Hook part 35 Transmission mechanism 36 First lever (lever, operation member)
36a blocking portion 37 second lever (lever, operating member)
38 torque shaft (operation member)
39a turnbuckle (connecting member, operating member)
39b, 39c connecting rod (connecting member, operating member)
40 drive unit 41 first rope (rope)
42 Winding machine 51 Second rope (rope)

Claims (5)

A hoisting gate type breakwater provided in the water and provided with a door body that rotates about a pivot shaft on the base end side by buoyancy from a fallen state and stands up, and a stopper device that prevents the hoisting movement of the door body. hand,
The stopper device is
It is provided below the door body in the fallen state, rotates about the pivot shaft on the base end side by buoyancy to stand up, and stops the falling motion of the door body when the falling door body comes into contact with the door body. a restraining rod;
a hook rotatably provided on the blocking rod;
a hooking portion for holding the upright state of the stopping rod by hooking the hook when the stopping rod stands up;
a drive unit that generates a tensile force that causes the stopping rod to fall down;
A transmission mechanism provided on the stopping rod,
The transmission mechanism is
an operation member that is connected to the hook and rotates the hook to release the engagement of the hook by the action of the tensile force of the driving portion;
After the hook is released from engagement, a blocking portion that prevents the hook from rotating by the operating member, thereby causing the tensile force acting on the operating member to act on the blocking rod to cause the blocking rod to fall down. An undulating gate type breakwater characterized by having In the undulating gate type breakwater according to claim 1,
The operating member is provided on the stopping rod, and is connected to a lever that rotates when a tensile force of the driving portion acts, the lever, and the hook, and rotates the hook as the lever rotates. a connecting member that rotates to release the engagement of the hook,
The hoisting gate, wherein the blocking portion is provided on the lever and configured to block rotation of the lever by coming into contact with the blocking rod when the lever rotates. type breakwater. In the rolling gate type breakwater according to claim 1 or 2,
An undulating gate type breakwater, wherein the restraining rod is configured such that a tip portion of the restraining rod contacts the lower surface of the gate body in the collapsed state, thereby restraining the erecting motion due to buoyancy. In the undulating gate type breakwater according to claim 3,
The blocking rod is
a cushioning material that is provided on the tip surface and that prevents the falling motion of the door when the falling door comes into contact with the door;
Provided at the tip portion, when the door body falls down, it contacts with the lower surface of the door body to prevent the cushioning material from contacting the lower surface of the door body and to stand up due to the buoyancy of the restraining rod. A rolling gate type breakwater characterized by having a rolling part whose movement is restrained. In the undulating gate type breakwater according to claim 1,
The undulating gate type breakwater, wherein the drive unit includes a rope connected to the operating member, and a hoist that applies the tensile force to the operating member by pulling the rope.

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