JP5614743B2 - Port entrance blocking structure - Google Patents

Description

  The present invention relates to a port entrance blocking structure for preventing unauthorized entry of illegal ships.

  Patent Document 1 includes a plurality of lower steel pipes that are inserted vertically through the foundation concrete provided on the bottom of the sea and vertically inserted into the bottom of the seabed, and are arranged close to each other with the upper end face open on the surface of the foundation concrete. A movable breakwater is disclosed that includes a levitating steel pipe that is inserted into the lower steel pipe so as to be movable up and down and that has a lower end surface open, and an air supply device that supplies air into each levitating steel pipe. . In case of dredging, this movable breakwater is used to completely open the outside of the bay and inside the bay by embedding the column of floating steel pipes on the bottom of the sea. Air is supplied into the levitation steel pipe, and the column of the levitation steel pipe is projected above the sea surface by the buoyancy to prevent the invasion of waves and tsunamis into the bay.

JP 2008-255719 A

  Further, as shown in FIG. 11, the present applicants have an air chamber 56e capable of entering and exiting water and capable of storing compressed air, and a buoyancy in which gas is sealed by being provided below the air chamber 56e. A floating steel pipe 56 having a tank 56d, an air supply device 52 for supplying compressed air to the air chamber 56e, and a compressed air in the air chamber 56e provided above the air chamber 56e of the floating steel pipe 56 A patent application has already been filed for an invention relating to the movable breakwater 51 provided with an exhaust device 57 for discharging to the outside of the levitation steel pipe 56 (Japanese Patent Application No. 2009-136075). The movable breakwater 51 supplies compressed air to the air chamber 56e by the air supply device 52, and causes the levitation steel pipe 56 to protrude above the seawater surface by the buoyancy and the buoyancy of the gas in the buoyancy tank 56d. Since this movable breakwater 51 has a buoyancy tank 56d in the levitation steel pipe 56, it can be levitated with a smaller amount of air than the conventional levitation steel pipe 56, and the levitation can be completed within a few minutes. It has the feature that it can do.

  The movable breakwater described in the above-mentioned Patent Document 1 and the above-mentioned patent application is originally intended to prevent the invasion of waves into the bay, but it is also possible to prevent the ship from entering the port. However, since a plurality of levitation steel pipes and lower steel pipes are installed so as to be close to each other at intervals of several tens of millimeters, there is a problem that the construction cost is high in addition to being over-spec for the purpose of preventing ship entry only. there were.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a port entrance blocking structure that prevents illegal entry of an unauthorized ship that can be constructed at low cost.

The present invention is a plurality of lifting devices arranged at predetermined intervals in the sea of the entrance of the port and capable of lifting and lowering,
A blocking member that is installed between the adjacent lifting devices and that allows passage of seawater but prevents passage of a ship;
A driving device for raising and lowering the elevating device;
With
The lifting device Ri upper end sea level under near at a location most lowered,
The blocking member is
A horizontal mooring line having both ends connected to the adjacent lifting device;
A vertical mooring line suspended from the horizontal mooring line;
With
A float covering the outer periphery of the horizontal mooring line is provided .

Further, the present invention is a plurality of lifting devices that are arranged at predetermined intervals in the sea of the entrance of the port and can be lifted and lowered ,
A blocking member that is installed between the adjacent lifting devices and that allows passage of seawater but prevents passage of a ship;
A driving device for raising and lowering the elevating device;
With
The blocking member is characterized in that it comprises a lateral mooring provided so as to surround the outer periphery of the elevating device in a spiral shape.

  ADVANTAGE OF THE INVENTION According to this invention, the port entrance blocking | blocking structure which prevents the illegal port entry of the unauthorized ship which can be constructed | assembled at low cost can be provided.

It is a top view of the port mouth interception structure concerning a first embodiment of the present invention. It is a front view of the port entrance interception structure concerning a first embodiment of the present invention. It is a sectional side view of the port mouth cutoff structure concerning a first embodiment of the present invention. It is a figure which shows the raising / lowering state of the port port cutoff structure which concerns on this embodiment. It is a figure which shows the raising / lowering state of the port port cutoff structure which concerns on this embodiment. It is a figure which shows the raising / lowering state of the port port cutoff structure which concerns on this embodiment. It is a front view of the port entrance interception structure concerning a second embodiment of the present invention. It is a top view of the port entrance interception structure concerning a third embodiment of the present invention. It is a front view of the port entrance interception structure concerning a third embodiment of the present invention. It is a figure which shows the state of a side mooring line when an upper steel pipe is stored in a lower steel pipe. It is a figure which shows a movable breakwater.

  Hereinafter, preferred embodiments of a port entrance blocking structure according to the present invention will be described in detail with reference to the drawings. The port entrance blocking structure according to the present invention is a ship or submarine that is not permitted to enter the port, for example, a fishing boat having a width of about 3 to 8 m, a suspicious ship of a small cargo ship class, a submarine having a width of about 2.5 to 4 m ( This is to prevent entry of submersibles with a displacement of less than 300 tons (generally called submersibles) and submarines with a width of about 4 to 9 m (displacement of 300 tons or more). In the following description, these ships and submarines that are not permitted to enter the port are referred to as unauthorized ships.

1 and 2 are a plan view and a front view, respectively, of a port entrance blocking structure 1 according to the first embodiment of the present invention. FIG. 3 is a side sectional view of the port entrance blocking structure 1 according to the first embodiment of the present invention.
As shown in FIG. 1 to FIG. 3, a port entrance blocking structure 1 that partitions the inside and outside of a port includes a plurality of lifting devices 2 that can move up and down in seawater, a blocking member 3 installed between adjacent lifting devices 2, And a driving device 4 for raising and lowering the lifting device 2.

  The lifting device 2 includes a lower steel pipe 5 embedded in the seabed ground E, and a levitation steel pipe 6 inserted into the lower steel pipe 5, and the buoyancy of air supplied into the levitation steel pipe 6. As a result, the levitation steel pipe 6 moves up and down.

  In the seabed ground E, foundation concrete 7 having a predetermined thickness with the seafloor GL as the top end is placed, and a foundation stone 8 is laid around the foundation concrete 7.

  The lower steel pipe 5 which penetrates the foundation concrete 7 vertically and reaches the deep part of the seabed ground E is buried at the port entrance at a predetermined interval. In the present embodiment, a plurality of lower steel pipes 5 having an outer diameter of 2 m are installed at intervals of 20 m, but the present invention is not limited to this value.

  The upper side of each lower steel pipe 5 is opened on the surface side of the foundation concrete 7, and the floating steel pipe 6 whose bottom face is opened is inserted into each lower steel pipe 5 so as to be movable up and down.

  The driving device 4 is formed on an air compressor 10 installed on the ground, a floating air supply pipe 11 for supplying compressed air discharged from the air compressor 10 to the lower steel pipe 5, and an upper lid 13 of the floating steel pipe 6. And an electromagnetic valve 15 that is connected to a hole 14 penetrating the upper lid 13 and can be opened and closed wirelessly, and an operation unit 16 such as a PC for operating the opening and closing of the electromagnetic valve 15 and the operation of the air compressor 10. .

The air compressor 10 is driven and stopped by sending a control signal from the operation unit 16 by wire. The electromagnetic valve 15 is opened and closed by sending a control signal wirelessly from the operation unit 16.
When the electromagnetic valve 15 is opened, the inside of the levitation steel pipe 6 communicates with the outside, and air can enter and exit. On the other hand, when the electromagnetic valve 15 is closed, the communication between the levitation steel pipe 6 and the outside is cut off.
The electromagnetic valve 15 is closed and compressed air is supplied into the levitation steel pipe 6 to generate buoyancy, and the levitation steel pipe 6 is raised toward the sea surface. On the other hand, the electromagnetic valve 15 is opened, and the buoyancy is lowered by discharging the compressed air in the levitation steel pipe 6, and the levitation steel pipe 6 is lowered.

  The blocking member 3 includes horizontal mooring lines 18, 28, 38 that are spanned between adjacent floating steel pipes 6 so as to form a plurality of upper and lower stages, and the horizontal mooring lines 18 and 28 that are vertically adjacent to each other. A plurality of vertical mooring lines 19 connected to each other and a plurality of vertical mooring lines 29 connecting the horizontal mooring lines 28 and the horizontal mooring lines 38 adjacent to each other are provided.

  The horizontal mooring lines 18, 28, and 38 are connected to the upper ends of the adjacent levitation steel pipes 6 so that the lifting and lowering operation of the levitation steel pipe 6 is not hindered, and the central portions 18a, 28a, and 38a are bent downward. It is installed in the state. In the present embodiment, three horizontal mooring lines 18, 28, and 38 are used, but the number is not limited to this.

In the present embodiment, the central portion 18a of the uppermost horizontal mooring line 18 is above the sea level WL, which is the height of the driver's seat of the suspicious ship, for example, at a height of about 3 m, and the middle horizontal mooring line 28. Is located on the sea level WL on which the suspicious ship sails, and the central part 38a of the bottom horizontal mooring line 38 is installed at a depth of about 5 m, which is the expected depth of the submarine and submarine in the port. ing.
The heights of the central portions 18a, 28a, 38a of the horizontal mooring lines 18, 28, 38 are not limited to these positions, and are appropriately determined depending on the size of the target ship. In short, it may be installed at a position where the target ship always passes so as to hinder the passage.

  A plurality of vertical mooring lines 19 are installed at predetermined intervals in the longitudinal direction of the horizontal mooring lines 18 between the horizontal mooring lines 18 and 28 adjacent to each other in the vertical direction. It is connected to.

  A plurality of vertical mooring lines 29 are installed at predetermined intervals in the longitudinal direction of the horizontal mooring lines 28 between the horizontal mooring lines 28 and 38 adjacent to each other vertically. , 38.

  The vertical mooring lines 19 and 29 are installed at intervals smaller than the width of the smallest suspicious ship or submersible, for example, at intervals of 2 m. In addition, in this embodiment, although installed at intervals of 2 m, it is not limited to this value, and is determined by design or the like in consideration of the type of the target ship and the like. In short, the interval may be such that the target ship cannot pass between the adjacent vertical mooring lines 19 and between the adjacent vertical mooring lines 29.

  Moreover, although this embodiment demonstrated the case where the space | interval between the adjacent vertical mooring lines 19 and the space | interval between the adjacent vertical mooring lines 29 were made into the same length, it is not limited to this, Even if it is mutually different length For example, the distance between adjacent vertical mooring lines 19 may be about 2.5 m smaller than the minimum width of the fishing boat, and the distance between adjacent vertical mooring lines 29 may be about 2 m.

  Further, the horizontal mooring lines 18, 28, 38 and the vertical mooring lines 19, 29 have such strength that they are not easily cut even when they come into contact with the ship. In this embodiment, as the horizontal mooring lines 18, 28, 38 and the vertical mooring lines 19, 29, metal hooks 18c, 28c, 38c are attached to both ends of a metal chain 18b, 28b, 38b, 19b, 29b having a diameter of 30 mm, respectively. , 19c, and 29c are used to connect the hooks 18c, 28c, and 38c to the suspension ring 20 provided on the upper end surface of the levitation steel pipe 6 so that the horizontal mooring cable between adjacent levitation steel pipes 6 is obtained. 18, 28, and 38, and hooks 19 c and 29 c are connected to the metal chains 18 b, 28 b, and 38 b of the horizontal mooring lines 18, 28, and 38, thereby Between them, vertical mooring lines 19 and 29 were installed between the horizontal mooring line 28 and the horizontal mooring line 38, respectively.

Next, the raising / lowering method of the raising / lowering apparatus 2 is demonstrated.
FIGS. 4-6 is a figure which shows the raising / lowering state of the port entrance cutoff structure 1 which concerns on this embodiment.

As shown in FIG. 4, during normal times, the floating steel pipe 6 is housed in the lower steel pipe 5 so that it is at the same level as the sea bottom GL, and the outside of the port and the inside of the port are completely released, so that the ship is free. You can go in and out of the harbor.
In this state, the horizontal mooring lines 18, 28, and 38 and the vertical mooring lines 19 and 29 are placed on the bottom surface GL, so that they do not collide with a ship that sails on the sea.
In addition, the electromagnetic valve 15 is normally closed, and the communication between the floating steel pipe 6 and the sea is blocked. The air compressor 10 is in a stopped state.

  When an unauthorized ship approaches the port or is informed that it is approaching the port, the port is permitted to enter the port through various communication means such as an electric bulletin board, ship radio, and port broadcast to the authorized ship that is allowed to enter the port and navigate nearby. After warning that the vessel is closed and confirming the safety of the permitted vessel, the operation unit 16 (see FIG. 3) drives the air compressor 10 to inject compressed air into the levitation steel pipe 6. In this state, the electromagnetic valve 15 is closed, and the communication between the floating steel pipe 6 and the sea is blocked.

  And if air injection is continued, as shown in FIG. 5, the levitation | swelling steel pipe 6 will acquire buoyancy and will raise.

  After that, as shown in FIG. 6, when the levitation steel pipe 6 is completely raised, the air compressor 10 is stopped and the supply of air into the levitation steel pipe 6 is stopped.

  As the levitation steel pipe 6 stands on the sea, the horizontal mooring lines 18, 28 and 38 and the vertical mooring lines 19 and 29 are installed in the form of a mesh on the sea and in the sea (see Fig. 2). To prevent. In this state, the electromagnetic valve 15 is closed, and communication between the inside of the levitation steel pipe 6 and the atmosphere is blocked.

  If it is determined that the unlicensed ship has left, an alarm to the effect of opening the port entrance is issued and then the solenoid valve 15 is opened, whereby the inside of the levitation steel pipe 6 communicates with the atmosphere. Thereby, the air in the levitation steel pipe 6 is discharged into the atmosphere, the column of the levitation steel pipe 6 loses buoyancy, and starts to descend into the lower steel pipe 5. In this state, the air compressor 10 is in a stopped state.

  In this way, the levitation steel pipe 6 is completely lowered and stored in the lower steel pipe 5, and when the open water area is formed and the ship can freely enter and exit, the operation unit 16 closes the electromagnetic valve 15. At this time, the communication between the inside of the levitation steel pipe 6 and the sea is blocked.

According to the port entrance blocking structure 1 in the present embodiment described above, the horizontal mooring lines 18 and 28 and the vertical mooring line 19 are installed above the sea level WL and on the sea level WL by raising the steel pipe 6 for levitation. Therefore, it is possible to prevent an unauthorized ship from entering a port of a fishing boat that sails on the sea or a small cargo ship class suspicious ship.
Further, since the horizontal mooring line 38 and the vertical mooring line 29 are installed in the sea, it is possible to prevent the entry of submersibles, diving boats, etc. that navigate the sea among unauthorized ships.

  Further, by lowering the levitation steel pipe 6, the horizontal mooring lines 18, 28, 38 and the vertical mooring lines 19, 29 can be placed on the sea bottom GL, and the permitted ship can enter the port.

  Moreover, since the lower steel pipe 5 and the levitation steel pipe 6 are installed at an interval of about 20 m, it can be constructed at a lower cost than the conventional case where the lower steel pipe 5 and the levitation steel pipe 6 are installed close to each other at an interval of several tens of millimeters.

  In the present embodiment, the case where the three horizontal mooring lines 18, 28, and 38 are installed has been described. However, the number is not limited to this number, and is appropriately determined depending on the design. For example, the horizontal mooring line 18 installed at the top is omitted, and the horizontal mooring line is slightly higher than the sea level WL and at a height at which the suspicious ship always passes, for example, about 0.5 m above the sea level WL. 28, and a horizontal mooring line 38 may be installed at a water depth of about 5 m, which is the navigation depth of the submarine and the submarine. However, it is desirable to install at least one or more above the sea level WL or on the sea level WL and at least one in the sea.

  Next, another embodiment of the present invention will be described. In the following description, portions corresponding to the above-described embodiment are denoted by the same reference numerals, description thereof is omitted, and differences are mainly described.

FIG. 7 is a front view of the port entrance blocking structure 21 according to the second embodiment of the present invention.
As shown in FIG. 7, the port opening blocking structure 21 that partitions the inside and the outside of the port includes a blocking member 23 between the adjacent levitation steel pipes 6.

  The blocking member 23 includes a horizontal mooring line 18, two vertical mooring lines 49, a plurality of vertical mooring lines 19, and a plurality of beam-like mooring lines 24.

  As in the first embodiment, the horizontal mooring line 18 has a central portion 18a installed above the sea level WL, for example, at a position of about 3 m.

  One end of each vertical mooring line 49 and each vertical mooring line 19 is connected to the horizontal mooring line 18, and the other end is connected to the sinker 22 embedded in the foundation concrete 7.

  Each vertical mooring line 49 is connected to the vicinity of the end of the horizontal mooring line 18. In the present embodiment, as the vertical mooring line 49, similarly to the vertical mooring line 19, a metal chain of the horizontal mooring line 18 using a metal hook 49 c connected to both ends of a metal chain 49 b with a diameter of 30 mm is used. Each hook 49c was connected to the suspension ring (not shown) provided in 18b and the sinker 22, respectively.

  Each vertical mooring line 19 is installed between two vertical mooring lines 49 in the longitudinal direction of the horizontal mooring line 18 at intervals of about 2 m, as in the first embodiment.

  A plurality of beam-like mooring lines 24 are installed between the vertical mooring lines 49 at predetermined intervals in the longitudinal direction of the vertical mooring lines 49, and both ends are connected to the vertical mooring lines 49.

  The beam-like mooring line 24 has such a strength that it is not easily cut even when it comes into contact with the ship. In the present embodiment, the beam-like mooring line 24 is the one that covers the outer periphery of the horizontal mooring line 28 with the float 25, and the hook 28 c is connected to the metal chain 49 b of the vertical mooring line 49, whereby the vertical mooring line. A beam-like mooring cable 24 is installed between the 49.

  By covering the outer periphery of the horizontal mooring line 28 with the float 25, the specific gravity of the beam-like mooring line 24 was adjusted to be about 1.1, which is slightly larger than seawater. Since the beam-like mooring line 24 has a specific gravity greater than that of seawater, when the levitation steel pipe 6 is stored in the lower steel pipe 5, the beam-like mooring line 24 is placed on the sea bottom GL and naturally floats. There is no. That is, when the levitation steel pipe 6 is stored in the lower steel pipe 5, the beam-like mooring line 24 does not levitate alone and collides with a navigating ship. On the other hand, by covering the outer periphery with the float 25, the amount of air required for ascent can be reduced as compared with the case where only the horizontal mooring line 28 is levitated.

  The beam-like mooring lines 24 are installed at different height positions. In the present embodiment, the beam-like mooring lines 24 are installed on the sea level WL and at a depth of about 5 m.

According to the port-opening blocking structure 21 in the present embodiment described above, by raising the floating steel pipe 6, the upper mooring lines 18, the upper mooring lines 19 and 49, and the upper beam-like mooring lines 24 are connected to the sea surface. Since it is installed above the WL and on the sea level WL, it is possible to prevent a fishing boat or a small cargo ship class suspicious vessel entering the sea among unauthorized vessels from entering the port.
In addition, since the middle and lower portions of the vertical mooring lines 19 and 49 and the lower beam-like mooring line 24 are installed in the sea, it is possible to prevent the entry of submarines, submersibles, etc. that sail in the sea among unauthorized ships. be able to.
Furthermore, since the lower ends of the vertical mooring lines 19 and 49 are connected to the sinker 22, it is possible to reliably prevent a submarine or a submarine from entering the port near the sea bottom GL.

  Further, by lowering the levitation steel pipe 6, the horizontal mooring lines 18, the vertical mooring lines 19 and 49, and the beam-like mooring lines 24 are placed on the sea bottom GL so that the permitted ship can enter the port. it can.

  Further, since the beam-like mooring line 24 has a configuration in which the periphery of the horizontal mooring line 28 is covered with the float 25, the outer diameter becomes larger, and the ship enters the port in a wider range than when the horizontal mooring line 28 is used alone. Can be prevented.

  In the present embodiment, the beam-like mooring line 24 is one in which the horizontal mooring line 28 is covered with the float 25, but is not limited to the horizontal mooring line 28, and the H-shaped steel 26 is made of the float 25. You may use what was covered. In such a case, as shown in the right round frame in FIG. 7, a metal hook 27 is connected to both ends of the H-shaped steel 26, and the hook 27 is connected to the metal chain 49 b of the vertical mooring line 49. Thus, the beam-shaped mooring line 24 having the H-shaped steel 26 is installed between the vertical mooring lines 49.

  Moreover, in this embodiment, although the vertical mooring line 19 was installed between the vertical mooring lines 49, the vertical mooring line 19 does not need to be installed.

  In the present embodiment, the beam-like mooring line 24 provided with the float 25 is installed between the vertical mooring lines 19, but the present invention is not limited to this, and the horizontal mooring line 18 instead of the beam-like mooring line 24. May be installed.

  In the present embodiment, the horizontal mooring line 18 is installed between the levitation steel pipes 6, but the present invention is not limited to this, and a beam-like mooring line 24 may be installed instead of the horizontal mooring line 18. . In such a case, a portion of the float 25 is cut away to expose the metal chain 28 so that the hooks 19c and 49c of the vertical mooring lines 19 and 49 can be connected to the metal chain 28.

  Next, a third embodiment of the present invention will be described.

8 and 9 are a plan view and a front view, respectively, of the port entrance blocking structure 31 according to the third embodiment of the present invention. FIG. 10 is a view showing a state of the side mooring line 34 when the levitation steel pipe 6 is stored in the lower steel pipe 5.
As shown in FIGS. 8 to 10, the port port blocking structure 31 that partitions the inside and outside of the port includes a blocking member 33.

  The blocking member 33 includes a side mooring line 34 installed so as to surround the outer periphery of the levitation steel pipe 6, and a plurality of beam-like mooring lines 24 installed between the adjacent side mooring lines 34. Yes.

  The side mooring line 34 is formed by spirally forming a wire made of a shape memory alloy. One end 34 a is connected to the suspension ring 20 at the upper end of the levitation steel pipe 6, and the other end 34 b is connected to the upper end of the lower steel pipe 5. ing.

When the levitation steel pipe 6 rises, one end 34a of the side mooring line 34 also rises, and the one end 34a becomes the apex, and the diameter gradually increases in a spiral manner downward. In addition, since the other end 34b is connected to the lower steel pipe 5, it does not rise.
Thereafter, when the levitation steel pipe 6 is lowered and stored in the lower steel pipe 5, the blocking member 3 is placed on the sea bottom GL in a shape-memory spiral shape.

  When the levitation steel pipe 6 is stored in the lower steel pipe 5, the side mooring line 34 is placed in a vortex state on the sea bottom GL, so that its height is substantially made of a shape memory alloy. It is the height of one wire. Therefore, the side mooring line 34 does not hinder the traffic of the ship while the levitation steel pipe 6 is stored in the lower steel pipe 5.

Each beam-like mooring line 24 is installed between adjacent side mooring lines 34 at a predetermined interval in the longitudinal direction of the levitation steel pipe 6, and both ends of the beam-like mooring line 24 are connected to the side mooring lines 34. ing.
In this embodiment, each beam-like mooring line 24 is installed at a position about 3 m above the sea level WL, on the sea level WL, and at a depth of about 5 m.

According to the port-opening blocking structure 31 in the present embodiment described above, by raising the floating steel pipe 6, the upper part of the side mooring line 34, the upper beam-like mooring line 24, and the middle-stage beam-like mooring line 24 are seawater. Since it is installed above the surface WL and on the sea surface WL, it is possible to prevent a fishing boat or a small cargo ship class suspicious ship entering the sea among unauthorized ships from entering the port.
In addition, since the middle and lower portions of the side mooring lines 34 and the lower beam-like mooring lines 24 are installed in the sea, it is possible to prevent the entry of submarines, submersible boats, etc. that travel in the sea among unauthorized ships. it can.

  Further, by lowering the levitation steel pipe 6, the side mooring line 34 and the beam-like mooring line 24 are placed in the vicinity of the sea bottom GL so that the permitted ship can enter the port.

  Further, since a wire made of a shape memory alloy is used as the side mooring line 34, when the levitating steel pipe 6 is stored in the lower steel pipe 5, the side mooring line 34 returns to a spiral shape and is adjacent to the adjacent side line. There is no entanglement with the mooring line 34.

  In addition, although this embodiment demonstrated the case where the other end 34b of the side mooring line 34 was connected to the lower steel pipe 5, it is not limited to this, As in the second embodiment, the inside of the foundation concrete 7 Alternatively, the sinker 22 may be embedded and connected to the sinker 22.

  In the present embodiment, the beam-like mooring line 24 having the float 25 is installed between the side mooring lines 34, but the present invention is not limited to this, and the horizontal mooring lines 18, 28, 38 without the float 25. Etc. may be installed.

  In each of the above-described embodiments, the case where the metal chains 18b and 19b are used as the horizontal mooring line 18 and the vertical mooring line 19 has been described. However, the present invention is not limited to this. For example, a metal wire A rope may be used. In short, any material may be used as long as it is capable of allowing seawater to pass through and has a strength that is not easily cut even when it comes into contact with the ship.

  In the above-described embodiments, the lifting device 2 is a mechanism that lifts and lowers the floating steel pipe 6 by buoyancy, but is not limited to this, and is installed in the floating steel pipe 6. As a mechanism for raising and lowering the levitation steel pipe 6 by injecting fluid into the bag body and inflating the bag body, or as a mechanism for raising and lowering the levitation steel pipe 6 by a cylinder, a spring or the like installed in the levitation steel pipe 6 Also good.

  In each of the above-described embodiments, the case where the upper portion of the floating steel pipe 6 is projected on the seawater surface WL has been described. However, the present invention is not limited to this, and the floating steel pipe 6 rises to near the seawater surface WL. If possible, it does not have to protrude to the sea. In such a case, at least one of the horizontal mooring lines 18, 28, 38, the vertical mooring lines 19, 29, 49, the beam-like mooring line 24, and the side mooring line 34 exists in the sea between the levitation steel pipes 6. Just do it.

  In each of the above-described embodiments, when the floating steel pipe 6 is bottomed, there is a possibility that the channel depth may be infringed by the stacked thickness of the mooring lines 18, 28, 38, 19, 29, 49, 24, 34. Appropriate measures such as dredging near the sea floor GL will be implemented as appropriate.

  The float 25 used in the second embodiment and the third embodiment may be applied to the horizontal mooring lines 18, 28, 38 and the vertical mooring lines 19, 29 of the first embodiment.

DESCRIPTION OF SYMBOLS 1 Port entrance cutoff structure 2 Lifting device 3 Shut-off member 4 Drive device 5 Lower steel pipe 6 Levitation steel pipe 7 Foundation concrete 8 Root stone 10 Air compressor 11 Levitation air supply pipe 13 Upper lid 14 Hole 15 Solenoid valve 16 Operation part 18 Horizontal mooring cable 18a Central portion 18b Metal chain 18c Hook 19 Vertical mooring line 19b Metal chain 19c Hook 20 Suspension ring 21 Port entrance blocking structure 22 Sinker 23 Blocking member 24 Beam mooring line 25 Float 26 H-shaped steel 27 Hook 28 Horizontal mooring line 28a Center Portion 28b Metal chain 28c Hook 29 Vertical mooring line 29b Metal chain 29c Hook 31 Port entrance blocking structure 33 Blocking member 34 Side mooring line 38 Horizontal mooring line 38a Central part 38b Metal chain 38c Hook 49 Vertical mooring line 49b Metal Chain 49c Hook 51 Movable breakwater 52 Air supply equipment 56 levitating steel 56d buoyancy tank 56e air chamber 57 exhaust system E Seabed GL seafloor WL sea level

Claims (2)

A plurality of lifting devices arranged at predetermined intervals in the sea of the entrance of the port and capable of moving up and down;
A blocking member that is installed between the adjacent lifting devices and that allows passage of seawater but prevents passage of a ship;
A driving device for raising and lowering the elevating device;
With
The lifting device Ri upper end sea level under near at a location most lowered,
The blocking member is
A horizontal mooring line having both ends connected to the adjacent lifting device;
A vertical mooring line suspended from the horizontal mooring line;
With
A port entrance blocking structure comprising a float covering an outer periphery of the horizontal mooring line . A plurality of lifting devices arranged at predetermined intervals in the sea of the entrance of the port and capable of moving up and down;
A blocking member that is installed between the adjacent lifting devices and that allows passage of seawater but prevents passage of a ship;
A driving device for raising and lowering the elevating device;
With
The port opening blocking structure characterized in that the blocking member includes a side mooring line provided so as to spirally surround the outer periphery of the lifting device.