JP2003213652A - Floating body type tide embankment and its maintenance method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To open and close a water channel in a short time in simple constitution. <P>SOLUTION: This floating body type tide embankment is provided with a jetty 1 installed on both banks of the water channel 3, a floating body closing levee 4 of a hollow structure, which is moved between the jetty 1a and the jetty 1b to close the water channel 3, and is a free floating body 6 having the degree of freedom and floating to be elongated in one direction, and a sea bottom reaction wall 10 installed at the sea bottom between the jetty 1a and the jetty 1b and coming into contact with the inside of the water channel of the floating body closing levee 4 under the water. The floating body closing levee 4 is moved to cross the water channel 3 by lifting a haul line 11 with a winch 12 provided on the jetty 1. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating type seawall for protecting flood areas such as Tokyo Bay from high tides and tsunamis and a maintenance method thereof.

[0002]

2. Description of the Related Art At present, there is concern about the influence of sea level rise due to global warming. Damage caused by sea level rise is an important issue on a global scale. Taking Japan as an example, the flood risk area due to high tide or tsunami is 900 even if the sea level rises 1 m.
The economic loss will be enormous, reaching 0 square kilometers. Therefore, there is an urgent need to build a system that can minimize the damage caused by sea level rise.

As a measure against storm surge due to sea level rise, a sea tide system is adopted in the ports of each country. For example, the largest tide embankment adopted in the Dutch new waterway is a sector type tide gate 900 as shown in FIG. 12, which has curved tide doors 901 on the left and right, and is supported by a swing arm 902. The tide door 901 can be housed in the dry dock 903. In this sector type sea tide gate 900, the sea tide door 901 is normally stored in the left and right dry docks 903, and at the time of high tide, water is poured into the dry dock 903 to float the sea tide door 901 and swing the sea tide door 901. As a result, the water channel is closed, and water is poured into the tide door 901 to settle it.
After the high tide has settled, the water in the tide door 901 is drained, floated once, then swung and stored in the dry dock 903. Then, the water in the dry dock 903 is drained and the sea tide door 901 is stored in a dry state.

Initially, the sector type sea tide gate 900 for the Dutch new waterway was constructed on the assumption that it will be used once every several years, but sea level rise has progressed remarkably due to changes in the global environment, and now it is for one year. The gate has to be opened and closed several times.

[0005]

The above-mentioned conventional sector type sea tide gate 900 has the problems that the structure is complicated and maintenance is troublesome because it is opened and closed mechanically. Second, since the width of the Dutch new waterway is 360 m, the sea tide door 901 becomes extremely large. Therefore, there is a problem in that it takes about 6 hours to actually open and close due to water injection into the dry dock 903 and various preparations, and the like.

At present, what is needed all over the world is
It is an extremely large seawall with a width exceeding 300 m, and it is necessary that it can be opened and closed in a short time with a simple structure in order to effectively deal with high tides and tsunamis that may frequently occur in the future. It In particular, in view of the damage caused by the tsunami caused by the earthquake in Okushiri Island, which is new to our memory in Japan, a seawall that can be opened and closed in a short time is urgently needed to protect human life and the land.

Therefore, the present invention has been made in view of the above, and it is a first object of the present invention to have a simple structure and easy maintenance. The second purpose is to be able to open and close in a short time.

[0008]

In order to achieve the above-mentioned object, the floating type seawall according to the present invention is moved between the jetty and the jetty installed on both banks of the waterway to close the waterway. At the same time, a floating structure deadline of a hollow structure that has a degree of freedom in at least the y-axis direction, the z-axis direction, and the a-axis rotation direction and that floats on the water that is long in one direction, and a floating structure installed on the bottom of the water between the jetty and jetty. It is provided with a reaction wall that comes into contact with the inside of the waterway of the deadline.

Since the floating body shelter has at least three degrees of freedom, the floating body shelter is pressed against the reaction force wall in the y-axis direction by water pressure, and the floating body shelter moves in the z-axis direction in response to changes in the water level. It is necessary for the operation of moving up and down and the operation of stabilizing the floating body cut-off work by the restoring force against the rotation of the floating body cut-off work in the a-axis rotation direction upon receiving water pressure. In particular,
It moves so as to be pressed against the reaction force wall by water pressure,
The mechanical structure is extremely simple because it only contacts the reaction force wall without being restrained. In addition, maintenance is easy because the floating body cut-off structure has a hollow structure and very few mechanical parts. Furthermore, because this floating body demolition work moves between the jetties to shut off the waterway,
The opening and closing time becomes extremely short.

In the case where the floating body cutoff works move between jetties, the waterways are closed by moving longitudinally between the jetties and turning the waterways. Is included. Further, the contact with the reaction force wall includes both the case where the contact is always made due to the degree of water pressure and the case where the contact is made intermittently. The present invention is suitable for a very large seawall, specifically, for an area having a waterway width of 200 m or more.

In the floating type seawall according to the following invention, one end of the jetty installed on both banks of the waterway is connected to one jetty by a connecting cable, and the one end is centered between the jetty and the jetty. It has a 6-degree-of-freedom structure with a hollow structure that floats on the water and has a 6-degree-of-freedom structure by swirling and closing the waterway, and a floating structure that is installed on the bottom of the water between jetties. And a reaction wall that comes into contact with the inside of the water channel of the water.

That is, by adopting a structure in which the floating body cutoff structure is swung, it is sufficient if the floating body cutoff member is located along the quay or the like when the water channel is open, and the water channel is swung when the water channel is closed.
Therefore, the present invention can be applied even to a narrow water channel.
The other end, which is not connected by a connecting line, may be connected to a winch pulling line provided on a jetty on the opposite bank, or may be pulled by a tugboat or the like.

A floating body type seawall according to the next invention has a jetty installed on both banks of a waterway, and one end of each jetty is connected to each jetty by a connecting cable, and a swivel is made between the jetty and the jetty around the one end. It has a 6-degree-of-freedom structure with a free floating structure that closes the water channel, and has a hollow structure with a hollow structure that floats on the water long in one direction and has a curved shape, and a floating structure installed on the bottom of the water between jetties. Contact the inside of the waterway of the deadline underwater,
And a reaction wall having a curved shape that conforms to the shape of the floating body cut-off work.

That is, in the present invention, the floating body shut-off work is formed into a curved shape so that it can withstand a large water pressure.
Further, since the end portion is connected to the jetty by a connecting line and is turned so as to close the water channel, a seawall can be installed even in a narrow water channel.

In the floating tide embankment according to the next invention, in addition to the above invention, a water stop plate is further provided on the inner surface of the water channel of the floating berth and facing the reaction wall. is there.

Since the water stop plate is located at a position facing the reaction wall, the floating deadline is brought into contact with the reaction wall by moving with water pressure, the reaction wall is installed on the bottom of the water, and the floating deadline floats. Water is stopped at the contact area. Thereby, the tide effect can be enhanced.

In the floating body type seawall according to the next invention, in the above invention, the floating body cut-off structure has six degrees of freedom by having a free floating body structure, and its center of gravity is located below the center. .

That is, by adopting the free floating structure, the mechanical parts are drastically reduced, the structure is simplified and the maintenance is facilitated. Further, since the center of gravity may be located below the center, the restoring force of the floating body cutoff works against the water pressure of high tide, and these are well balanced to stabilize the floating body cutoff. For specific operations, refer to the embodiments below.

In the floating body type seawall according to the next invention, in addition to the above invention, the floating body cutoff and the jetty are further connected by a pulling rope, and at least one of the floating body cutoff and the jetty is provided with a winch of the pulling rope. The rope is extended to the length where it is sunk to the bottom of the water when the canal is opened.

Since the floating body shut-off work has a floating body structure, it is structurally simple to wind up the pulling rope with the winch and move it by pulling it. Further, since the pulling rope is located so as to cross the waterway when the waterway is opened, the pulling rope is sunk to the bottom of the water when the waterway is opened so that the navigation of the vessel is not hindered.

In the floating body type seawall according to the next invention, in the above invention, the floating body cutoff has a wave pressure reducing shape outside the water channel. Even when a large pressure such as a tsunami is exerted, this can be alleviated by the wave pressure reducing shape, so that the stability of the floating body cut-off work is enhanced. As the wave pressure reducing shape, various shapes such as a known curved surface shape can be adopted.

A floating body type seawall according to the next invention is the same as the above invention, wherein the floating body cutoff is a plurality of ballast chambers.
It has a pouring and draining means for pouring and draining the ballast chamber. If the storm surge raises the float cut-off too much, making contact with the reaction wall difficult or the contact area narrows, water should be poured into the ballast chamber to sink the float cut-off and obtain proper contact. To As a result, the range of storm surge head difference that can be accommodated by this floating type seawall is widened.

In the floating body type seawall according to the next invention, in the above invention, the floating body cut-off structure has a divided structure in the longitudinal direction, and each floating body cut-off work piece is connected by a connecting line. By dividing in the longitudinal direction, when there is a water level difference in the longitudinal direction of the floating body shutoff, each floating body shutoff piece can move up and down according to each water level. As a result, since an excessive bending load is not applied to the floating body cut-off work, damage to the floating body cut-off work can be prevented. Further, it is necessary to have a strength capable of withstanding the bending load, but if divided, the load applied to each floating body cutoff piece becomes small, so design can be made with a small strength and the floating body cutoff piece can be lightened.

In the floating type seawall according to the next invention, in the above invention, since the floating deadline is structurally strong against an external force such as an earthquake because it has a floating structure, it also functions as a floating disaster prevention base. Or, the inside is a disaster facility including a human shelter. If the port collapses due to a disaster (earthquake, storm surge, tsunami, eruption, etc.), it will not be able to function as a port that is a base for receiving supplies (relief supplies, etc.), so it will be a complementary function of the port and a function as a storage warehouse for disaster supplies. It is especially effective in urban areas to have a floating-type disaster prevention base with. In addition, after the storm surge or tsunami, residents in areas where houses and others have disappeared due to the disaster need to blame gymnasiums and live, and in such disaster areas there are few hotels in many areas. For this reason,
It is effective to use a hollow structure with a hollow interior as a disaster facility, especially as a refuge for residents. In addition, in the floating body type seawall according to the present invention, the vessel is used as a floating body deadline,
Preferably, a stretched ship can be used to promote effective use of resources.

In the floating body type seawall according to the next invention, in the above invention, the floating body cutoff itself has a function as a ship. The floating body cut-off work, which has the function of a ship, can be used as a means of transportation after a disaster to speed up recovery from the disaster.

In the method for maintaining a floating type seawall according to the next invention, a jetty installed on both banks of the waterway, and moving between the jetty to close the waterway, and at least y
A hollow structure floating structure with a degree of freedom in the axial direction, z-axis direction, and a-axis rotation direction, which floats on the water long in one direction, and a water channel for the floating structure structure installed on the bottom of the water between the jetty. A reaction wall that comes into contact with the inside of the water is provided, and the winch of the pulling rope is provided on at least one of the floating body cutoff and the jetty, and the pulling rope is provided when the waterway is opened. A floating body type seawall is constructed so that it can be extended to the length where it is sunk to the bottom of the water, and the floating body cut-off works are separated from the pulling ropes and towed to a ship for maintenance at another location.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail with reference to the drawings. The present invention is not limited to this embodiment. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same. Further, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art.

(Embodiment 1) FIG. 1 is a configuration diagram showing a floating body type seawall according to Embodiment 1 of the present invention. Figure 2
[Fig. 2] is a cross-sectional view of the floating type seawall shown in Fig. 1. Figure 3
[Fig. 3] is an explanatory view showing the movement of the floating body cut-off work shown in Fig. 1. This floating body type seawall 100 includes, for example, a jetty 1 constructed on both sides of a waterway having a width of 450 m and a water depth of -14 m, a projection 2 provided at an end of each jetty 1, and a jetty 1 a and a jetty 1 b. It is provided with a floating body closing work 4 for opening and closing the water channel 3. At the tip of the jetty 1, a lighthouse 5 indicating the position of the water channel is installed. In one jetty 1, the position of the projection 2 is set back from the tip, and a plurality of columns 6 are erected from the water along the jetty 1 with a certain width. The plurality of pillars 6 and the protrusions 2
The jetty 1 and the jetty 1 form a storage area for the floating body shutoff 4. The jetty 1 and the pillar 6 are made of reinforced concrete.

The floating body shut-off work 4 is a hollow box-making structure of heavy corrosion-resistant steel plate, prestressed concrete structure, PC hybrid structure, or RC hybrid structure, and has a rectangular shape with a total length of about 450 m and a width of about 30 m. Is. The outer upper edge portion has a curved wave pressure reducing shape 7. In addition, a rectangular water stop plate 8 is provided at the lower edge inside the water channel.
Is installed over the entire length. The material of the water blocking plate 8 is preferably a rubber material or stainless steel.
The water stop plate 8 is not essential, but the constituent material (for example, steel plate) of the floating body cut-off work 4 may be processed by thermal spraying or the like so as to have the same function as the water stop plate 8. Floating body deadline 4
Is always floating on the sea, is floating in the storage area in normal times, and is in a floating state by blocking the water channel 3 at the deadline. Further, inside the bay of the water channel 3, between the jetty 1 and the jetty 1, a groove 9 having a constant depth is dug in the seabed, and a seabed reaction wall 10 is formed on one surface thereof. The seabed reaction wall 10 is made of reinforced concrete and is installed on the seabed by anchor piles 10a.

The floating body cutoffs 4 are moored by the pulling ropes 11 at both ends thereof to the jetty 1 on both sides. Further, a winch 12 of a pulling rope 11 is installed on the projecting portion 2 of the jetty 1 (or the floating body cutoff 4). The pulling rope 11 that is normally located in the waterway 3 is sunk on the seabed. By being sunk on the seabed, vessels can freely move on and off the waterway 3. As the pulling rope 11, a wire, a chain or the like can be used, and it is preferable that the pulling rope 11 has anticorrosive properties like the floating body shutoff 4. This floating body cutoff 4 is designed so that the center of gravity is located below the central axis in the longitudinal direction.
Appropriate planting 13 is applied to the upper surface of the floating body cut-off work 4 to provide a landscape like an artificial island. In addition, the planting 13 has an action of reducing the momentum of the tsunami.

A predetermined gap exists between the floating body cutoff 4 and the seabed. This gap is effective as a countermeasure against sediment deposited on the seabed. That is, the one that mechanically swings the tide door and sinks like the conventional sector type tide gate,
There are mechanical parts such as rails for swing motion in the water, and the tide doors come into contact with the sea bottom when they are settled, so depending on the state of sediment, the tide doors may not completely settle or the mechanical parts may not function. Although there is a possibility that it will disappear, this floating body cutoff 4 is a free floating body, and since there is a gap with the seabed, there is almost no effect of sedimentation. Therefore, the opening / closing operation can be reliably performed.

The operation of the floating type seawall 100 will be described below. As shown in (a) of FIG. 1, in normal times, the floating body cut-off 4 is stored in a floating state in the storage area, and the water levels on both sides of the floating body cut-off 4 are the same. In such a state, the winch 12 provided on the projection 2 of the one jetty 1a is in a state in which the pulling rope 11 is wound, and the other jetty 1b
The winch 12 provided on the protrusion 2 is in a state in which the pulling rope 11 is extended until the floating body shutoff 4 is stored in the storage area and the pulling rope 11 itself sinks to the seabed. The water stop plate 8 of the floating body cut-off work 4 and the seabed reaction force wall 10 are only slightly contacted by the ocean current.

Next, when the deadline of the water channel 3 is performed, as shown in FIG.
As shown in (b), the pulling rope 11 is wound by the winch 12 on the jetty 1b side, the pulling rope 11 sinking to the seabed is first stretched, and then wound around the drum of the winch 12. As a result, the floating body shelter 4 is drawn so as to cross the water channel 3, while the winch 12 on the opposite side pulls out the retracted rope 11 and allows the floating body shelter 4 to move. FIG. 1C shows a state in which the floating body shut-off work 4 is shut off. Since the floating body shut-off work 4 is only pulled and moved by the winch 12, the time from the start of the shut-off to the end is 30 minutes, which is an extremely short time. Therefore, it exerts its effect when urgency is required such as a tsunami caused by an earthquake.

In this floating body shut-off work 4, the seabed reaction wall 10 and the water stop plate 8 are positioned to face each other in the shut-off state. If the outside water level rises due to the occurrence of storm surge,
As shown in (b), the water stop plate 8 is pressed against the seabed reaction force wall 10 in a floating state to stop water. In addition, the water stop plate 8
The sea bottom reaction force wall 10 does not have to be in complete contact with each other, and the water blocking function can be sufficiently exerted even if the floating body shutoff 4 rotates a little and the contact state changes.

Further, the water pressure due to the high tide will be applied to the side wall of the floating body deadening work 4, but the restoring force works around the center of gravity of the floating body deadening work 4 against the water pressure, and as a result, the floating body deadening work 4 is Stabilize. Moreover, although the floating body shut-off work 4 floats due to high tide, if the water stop plate 8 and the seabed reaction force wall 10 are in contact with each other to stop water, the change in height does not matter. Preferably, if the width of the water stop plate 8 is large, the range that can cope with the rise due to the high tide is wide, but the depth of the groove 9 is required accordingly, so that the necessary and sufficient water stop from the range of the expected high tide It is advisable to adopt the width of the plate 8. Further, although sand may be deposited in the groove 9 due to the flow of the tide, since the floating body shut-off structure 4 has a floating structure, sedimentation does not affect the function of the seawall.

Furthermore, high waves such as a tsunami are relieved in their momentum by the wave pressure reducing shape. Further, in the case of an even higher high wave, the momentum is relaxed by the planting 13 on the floating body cut-off work 4. The wave pressure reducing shape 7 is not limited to the curved surface as described above, and may have a step shape.

Referring to FIG. 3, since the floating body shut-off work 4 is a free floating body and has no structure constrained by a hinge or the like,
It has 6 degrees of freedom. However, the degrees of freedom required for the present invention are at least three degrees of freedom in the y-axis direction, the z-axis direction, and the a-axis rotation direction (roll) in the figure. That is, y of the floating body deadline 4
Axial movement is necessary for the floating body cut-off 4 to be pressed against the seabed reaction wall 10 by water pressure, and in the z-axis direction for the floating body cut-out 4 to move up and down in response to changes in the water level. Is. In the a-axis rotation direction, the floating body cutoff 4
Is rotated in the a-axis rotation direction, and it is necessary to stabilize the floating body shutoff 4 by restoring force.

On the other hand, it is preferable to have a degree of freedom in the b-axis rotation direction (pitch). Since the floating body shutoff work 4 has a total length of 450 m, the water level may be different at distant positions. For this reason, the floating body cut-off 4 is bent due to the water level difference. However, rather than applying stress to the floating body cut-off 4, a slight rotation in the b-axis rotation direction depending on the water level difference provides the structural strength. This is more preferable because it is not necessary to provide the deadline 4 with it.

It should be noted that the effect of the present invention can be obtained even in the case of restraint, except that it moves in the x-axis direction due to the deadline. Regarding the c-axis rotation direction (yawing),
Almost restrained by the contact between the water stop plate 8 and the submarine reaction force wall 10, but the floating body shutoff 4 having a long overall length does not apply water pressure evenly, so that it can be slightly rotated in the c-axis rotation direction. Preferably.

As described above, according to the floating body type seawall 100 described above, the structure is simplified because the structure of the floating body has a degree of freedom in movement and the mechanical portion is drastically reduced.
Further, since the mechanical part is about a winch, maintenance is extremely easy. In particular, since there are no rails or the like for opening and closing, there is no need to worry about machine malfunctions due to marine attached organisms. Also, there is no adverse effect of sedimentation.

Next, the floating line shut-off work 4 is performed by the pulling rope 11.
Since the seawall can be opened and closed by simply pulling in, the opening and closing time can be extremely shortened. Therefore, a sudden situation,
For example, it can quickly respond to a tsunami caused by an earthquake or a typhoon and ensure the safety of the coastal area.

As for maintenance, since the floating body shut-off work 4 has a complete floating body structure, as shown in FIG.
It is preferable that the floating body shut-off work 4 is separated from the jetty, towed by the tugboat 15, and predetermined maintenance is performed by a maintenance dock (not shown). Here, when the maintenance requires several months, it is preferable to attach the spare floating body shutoff 4a to the jetty 1. Also, after the maintenance is completed, the floating body cut-off 4 should be attached to the seawall that is scheduled for another maintenance instead of the floating cut-off 4 where the spare floating body cut-off 4a is currently installed. You can At that time, the landscape of the planting 13 on the upper surface of each floating body deadline 4 can be changed periodically if the structure is different.

(Embodiment 2) FIG. 5 is a block diagram showing a floating body cut-off work of a floating body type seawall according to Embodiment 2 of the present invention. This floating body cut-off work 201 intends to utilize the hollow interior effectively and use it as a facility for evacuation in the event of a disaster. The floating deadline 201 itself is configured like a ship and is divided into a plurality of internal blocks, the tip 202 is a warehouse, the center 203 is a human shelter,
The rear end portion 204 is the engine room. Floating body deadline 201
A screw shaft 206 connected to the engine 205 projects from the rear part, and a screw 207 is attached to the tip.

An entrance 208 to the evacuation center 203 is provided on the upper surface of the floating body cutoff 201, and the evacuation center 203 can be descended by stairs 209.
A bridge 210 is constructed on the upper surface of the floating body cut-off structure 201, and facilities necessary for a normal ship such as a radar and an antenna are provided. Usually, this bridge 210 is used as a lighthouse showing the position of the floating body deadline 201. The water stop plate 8 is attached to the side surface of the floating body cut-off structure 201. The pulling rope 11 includes a fixed portion 211 at the front and rear ends.
Fixed to.

As described above, by using the floating body cut-off work 201 as an inconvenient facility, it is useful for rescue and recovery activities in the event of a disaster, and the internal space can be effectively used. Since the floating body deadline 201 itself is navigable, it can be used for various purposes such as a cargo ship. It can also be used as a floating warehouse. It can also function as a floating disaster prevention base. Specifically, what is proposed by the Port Bureau of the Ministry of Transport is known, and its features are that it is not directly affected by the earthquake (earthquake resistance) and that it can be towed and moved to the disaster area (movement). It is to be able to temporarily store emergency supplies using the internal space (use of the internal space).

(Embodiment 3) FIG. 6 is a configuration diagram showing a floating body type seawall according to Embodiment 3 of the present invention. This floating body type seawall 300 has substantially the same configuration as that of the first embodiment, but is characterized in that the floating body cut-off structure 301 is provided with a ballast structure. Other configurations are similar to those of the floating body type seawall 100 according to the first embodiment, and therefore description thereof will be omitted, and the same components will be denoted by the same reference numerals. This floating body deadline 301
Has a plurality of ballast chambers 302 therein, as shown in FIG. Each ballast chamber 302 injects water into the inside from a water injection port 303 provided in the side wall 301a of the floating body cut-off structure 301, and drains water by a pump 304.

The water injection port 303 may be opened and closed automatically or manually. Further, it is functionally preferable to provide a pump 304 for each ballast chamber 302, but each pump has one left and right pump 304 and moves the pump 304 in the longitudinal direction through the ballast chamber 302 (moved by a dotted line in the figure). It is more preferable to sequentially discharge the ballast water in order to simplify the structure and reduce the cost.

FIG. 10A shows the floating state of the floating body shut-off work under normal conditions. Further, in the state where the floating body shut-off work 301 rises due to the rise of the water level and is stable due to the balance of the water pressure and the restoring force, the floating body shut-off work 301 rotates and the water stop plate 8 is pressed against the seabed reaction force wall 10, It is stopped.
At this time, when the water level has risen considerably due to the high tide and the contact between the water stop plate 8 and the seabed reaction wall 10 cannot be maintained, the ballast water is poured into the ballast chamber 302 to close the floating body. Allow 301 to settle. As a result, as shown in FIG. 3B, the water blocking plate 8 and the seabed reaction force wall 10 are in contact with each other to maintain the water blocking state.

At this time, the center of gravity G of the floating body cut-off structure 301 is
Since it moves downward (center of gravity G '), the restoring force increases and resists high water pressure, and the balance of the floating body shut-off work 301 is maintained. Floating body cutoff 30 having the ballast structure as described above
According to the first aspect, in addition to the same effect as the floating body type seawall 100 of the first embodiment, there is an advantage that the applicable head difference can be increased. Although not shown, ballast water may be injected into only one side to enhance the stability.

(Embodiment 4) FIG. 7 is a block diagram showing a floating body type seawall according to Embodiment 4 of the present invention.
(A) is a plan view and (b) is a side view. This floating body type seawall 400 is characterized in that the floating body cut-off work 401 is divided into three parts, and since the other structure is the same as that of the floating body type seawall 100 shown in the first embodiment, the same constituent elements are used. Are denoted by the same reference numerals and description thereof will be omitted. This floating body deadline 4
01 is three completely independent floating body cut-off pieces 402-4
04, the floating body cut-off pieces 402 to 404 are connected to each other by connecting wires 4 such as wires and chains which are relatively short in water.
It is connected by 05. Floating body cut-off piece 402-40
Each of 4 has 6 degrees of freedom as described above.

The floating body shut-off pieces 402 and 404 on both sides are connected to the winch 12 of the projection 2 by the pulling rope 11. At the deadline, as shown in FIG.
When the water level H of the tide is different in the length direction of the floating body cutoff 401, specifically, when the water level becomes low in the center of the waterway 3 and becomes high on the right side of the waterway 3, the floating body cutoff 401 is divided. In the figure, the floating body cut-off piece 403 at the center in the figure descends along the water level, and the floating body cut-off piece 404 on the right side rises along the water level.

The adjacent floating body cut-off pieces 402 to 404 are
Since it is connected with a slight margin with the connecting rope 405,
Even if there is a difference in height, it moves up and down independently within the allowable range. On the other hand, when the floating body cut-out is an integral structure, a bending load is applied to the floating body cut-out due to the water level difference at different positions of the floating body cut-out, and if it is too large, it will be deformed or fatigue failure will occur due to long-term use. It will be easier. For this reason,
As in this embodiment, by dividing the appropriate number of floating body cut-off pieces 402 to 404 by connecting lines 405, the bending load applied to the structural material is reduced, and the probability of deformation or breakage occurs. It is effective to lower. In addition, in the floating body type seawall 400 of the present invention, the function can be sufficiently fulfilled even if the floating body cut-off work 401 is slightly deformed, but the problem is that the deformation causes a crack in the steel plate or concrete, The deadline 401 is to settle.

Since the floating body type seawall 400 having such a structure has a divided structure, it is assumed that one floating body closing work piece 402 to 40.
Even if a crack is generated in 4, the floating body cutoff piece 402
It is economical because only the parts ˜404 can be exchanged and connected by the connecting cord 405. In addition, the floating body cut-off piece 402-404
There is a slight gap between the floating body cutoff piece 402 and the floating body cutoff piece, but the water entering from here does not affect the tide function very much. Preferably, the connecting portion of the floating body cut-off piece is formed into a ship wrap shape so that water can be further prevented from entering (not shown).

(Fifth Embodiment) FIG. 8 is a plan view showing a floating type seawall according to a fifth embodiment of the present invention. This floating body type seawall 500 is an example in which the present invention is applied to a narrow water channel, and in the case of a narrow water channel 530, the first embodiment is described.
Since the jetty 1 as shown in FIG. 2 cannot be formed in the waterway 3 in the jetty-like shape, the floating body cutoff structure 501 is swung to make the waterway 530
The deadline is set.

The floating body cutoff structure 501 has the same structure as that of the first embodiment. A side wall 502 is formed along the quay, and a part 503 of this side wall 502 is projected toward the water channel 530 side. One side wall 503 and the end of the floating body cutoff 501 are
They are connected by a connecting cable 504 such as a wire or a chain.
Further, at the end opposite to the side wall 503, the floating body cutoff 50.
A pulling rope 506 for pulling 1 and fixing the water channel 530 in an open state and a winch 607 for winding and unwinding the pulling rope 506 are provided.

A winch 50 is provided on the other side wall 505.
8 is further provided, and a pulling line 509 that is wound and unwound by the winch 508 is provided.
In this pulling rope 509, the floating body cut-off work 501 is provided on the side wall 50.
When it is fixed along the line 2, it is sunk on the bottom surface of the water channel 530 so that the ship can navigate thereabove. Further, the seabed reaction force wall 10 having the same configuration as that of the first embodiment is provided so as to cross the water channel 530.

In this floating body type seawall 500, the floating body cut-off work 501 is fixed along the side wall 502 in normal times. This fixing is performed by the winch 50 provided at the end of the side wall 502.
By pulling and fixing the pulling rope 506 at 7, it is fixedly moored while floating above the water channel 530 (position A in the figure,
The state of the pulling rope 506 is shown by a dotted line). Next, waterway 5
When closing 30, the winch 508 provided on the side wall 505 on the opposite side is rotated, the pulling rope 509 is wound up, the pulling rope 509 which is sunk at the bottom of the water is raised to near the water surface, and the winding is continued as it is, thereby closing the floating body. The work 501 is turned in the direction of the arrow in the figure. At that time, the winch 507 used for fixing is opened and the winch 50
The pulling rope 506 is pulled out from 7.

Next, the floating body shutoff structure 501 is swung to shut off the water channel 530 (position B in the drawing, the state of the pulling rope 509 is shown by a dotted line) and the rotation of the winch 508 is fixed in that state. In this state, as described in the first embodiment, the water stop plate 8 and the seabed reaction force wall 10 contact each other to stop the water in the water channel 530 (see FIG. 2). In addition, it is desirable that the pulling rope 506 stretched between the end of the floating body shut-off work 501 and the winch 507 of the side wall 502 in the closed state is further extended by the winch 507 to be sunk to the bottom of the water. .

On the contrary, when the water channel 530 is opened, it is carried out by the process reverse to the above. That is, the winch 507 on the side wall 502 pulls up the pulling rope 506 and pulls the floating body shut-off work 501, and swivels in the direction of the arrow in the drawing to open the water channel 530. The winch 508 provided on the opposite side wall 505 extends the pulling rope 509,
Set it down so that it does not interfere with vessel navigation. And
Stop the winch 507 and attach the floating body cut-off work 501 to the side wall 50.
Fix to 2.

According to the floating body type seawall 500 described above, the same effect as that of the first embodiment can be obtained, and the narrow water channel 53 is provided.
Even at 0, the floating body type seawall 500 can be installed. In particular,
It is effective as a tide protection measure in countries with rias coasts and canals. In the above, the pulling lines 506 and 509 are used.
Was connected to the turning outer end portion 501a of the floating body cut-off structure 501 and pulled to close the water channel 530. However, a propulsion means such as a large outboard motor is attached to the turning outer end part 501a of the floating body cut-off work 501. It is also possible to provide and to rotate the floating body shutoff work 501 by this propulsion means (not shown). Then, the floating body shut-off work 501 may be fixed by mooring it to a structure provided on the side wall 505 by a mooring line provided on the turning outer end portion 501a.

(Embodiment 6) FIG. 9 is a block diagram showing a floating type seawall according to Embodiment 6 of the present invention. In this floating body type seawall 600, a short jetty 601 is provided on the quay G of the water channel 630, and an arcuate floating body shutoff 602 is connected to the jetty 601 by a connecting cable 603. The connecting cord 603 is composed of a wire, a chain, or the like, and the connecting portion is simply connected without using a winch. The curved floating body cut-off 602 has the same configuration as that of the floating body cut-off 4 shown in the first embodiment except that it is curved. Specifically, it has a box structure of a heavy-corrosion steel plate,
A curved water stop plate made of rubber or stainless steel is provided in a lower portion of the surface located inside the water channel 630 (not shown). In addition, a seabed reaction force wall 604 is installed in a shape that follows the curved shape of the floating body cutoff 602.

Next, the swinging outer end portion 60 of the floating body cut-off structure 602.
2a are connected by a pulling rope 605 such as a chain,
A winch 606 is provided on at least one turning outer end 602a.
Is provided. This pulling rope 605 is normally sunk on the seabed when the water channel 630 is open, and enables the navigation of the ship. In addition, a pulling line 607 used when opening the water channel 630 is connected to substantially the center of the floating body cutoff 602, and the other end is a winch 608 installed on the quay.
It is connected to the. In addition, the floating body deadline 602
Is not located in the groove as in the first embodiment,
It moves along the upper surface of the shelf formed on the sea floor and maintains a gap of a predetermined size with the shelf surface. Further, in order to simplify the construction, it is desirable that the seabed reaction force wall 604 is configured so that an arched wall body is sunk and both ends thereof are supported by the quay G.

The operation of the floating type seawall 600 will be described. In normal times, the quay G with the floating structure deadline 602 floating
Is moored to. Swiveling outer end 60 of floating body cutoff 602
The pulling rope 605 between the two 2a is sunk on the seabed.
Here, by pulling up the pulling rope 605 by the winch 606 of the turning outer end portion 602a, the pulling rope 605 on the seabed rises to near the water surface, and the floating body cut-off works 602 are arranged with the connecting rope 603 of the jetty 601 as the center. Turn.
At this time, the winch 608 of the quay G pulls the pulling rope 607.
It works to pay out.

Then, as shown in FIG. 7B, the floating body cut-offs 602 having a curved shape close off the water channel 630 to form a large arc-shaped floating body cut-off 602. In this state, the winch 606 of the outer end 602a of the turning turns to draw the pulling rope 6 in this state.
Fix 05. On the other hand, the winch 608 of the quay G further draws the pulling rope 607, and the pulling rope 607 is sunk on the seabed. When closing the water channel 630, the pulling rope 607 may be wound by the winch 608 and the pulling rope 605 may be drawn by the winch 606.
In this floating body type seawall 600, since the floating body cutoff 602 has an arc shape to close the water channel 630, it is possible to maintain structural strength against a large water pressure. The floating body cutoff 602 has the same function as the 6-degree-of-freedom floating body cutoff 4 shown in the first embodiment, and has the same effect as that of the first embodiment.

(Embodiment 7) FIG. 10 is a block diagram showing a floating type seawall according to Embodiment 7 of the present invention. The floating body type seawall 700 is the floating body type seawall 1 of the first embodiment.
The construction is substantially the same as that of 00, but is characterized in that a disused ship such as a tanker is used as the floating body shutoff 701. Since other configurations are the same as those of the first embodiment, the description thereof will be omitted and the same elements will be denoted by the same reference numerals. This floating body deadline 70
No. 1 is a stretched waste tanker. With regard to abandoned tankers, old tankers may become obsolete due to the advent of new, high-performance tankers, and disposal may be difficult. On the other hand, since the floating body cut-off work 701 is simply a floating body structure and has a large size, in the present invention, the waste ship tanker is reused to effectively utilize the resources.

FIG. 11 is an explanatory view showing an example of a stretching operation of a waste ship tanker. First, 2 of the abandoned tanker 702
Cut it into two pieces ((a) in the figure), and then use this abandoned tanker 70
Both ends 703 of the abandoned tanker 703 of about the same size as 2
Cut off a and 703b ((b) in the figure), body part 7
03c is taken out ((c) in the figure). Then, the body portion 703c is divided into the two divided tanker tankers 702a,
It is inserted between 702b ((d) in the figure), and the seam is welded to form an integral structure ((e) in the figure). Furthermore, the floating body deadline 701
Attach the water stop plate 8 to the starboard side ((f) in the figure). The bridge 702c of the abandoned tanker 702 may be left as it is or may be demolished. Further, it is also possible to attach a wave pressure reducing plate 704 having a curved surface shape, which is a wave pressure reducing shape, to the upper port portion of the floating body cut-off structure 701 ((e) in the figure).

The floating body type seawall 700 described above has the same effects as those of the first embodiment, and further has an advantage that effective use of resources can be promoted by using an unnecessary waste ship. Further, the abandoned ship may be a passenger ship or a megafloat as well as a tanker.

[0068]

As described above, in the floating body type seawall according to the present invention, the jetty installed on both banks of the waterway and moved between the jetty to cut off the waterway, and at least in the y-axis direction. , Z-axis direction, a-axis rotation direction has a degree of freedom,
And a floating structure deadline with a hollow structure that floats on water long in one direction,
Since there is a reaction wall that is installed on the bottom of the water between the jetty and is in contact with the inside of the water channel of the floating body cutoff underwater, it has a simple structure with few mechanical parts and maintenance is easy. Further, the opening / closing time can be extremely shortened.

Further, in the floating type seawall according to the present invention,
One end of the jetty installed on both banks of the waterway is connected to one jetty by a connecting cable, and the jetty is swung around the jetty around the one end to close the waterway, and at least in the y-axis direction, z. A hollow structure floating structure with a degree of freedom in the axial direction and the a-axis rotation direction, which floats on the water long in one direction, and a submersible structure installed on the bottom of the water between the jetties. Since it has a reaction force wall that comes into contact with it, it is possible to install a seawall that has a simple structure and is easy to maintain even in narrow waterways.
Further, since the floating body closing work of the floating body structure can be opened and closed only by turning, the opening and closing time of the water channel can be shortened.

Further, in the floating body type seawall according to the present invention,
By connecting the jetty installed on both banks of the waterway and one end of each jetty with a connecting cable, turning between the jetty and the jetty around the one end to close the waterway, and by forming a free floating structure. The floating structure has a 6-degree-of-freedom structure and has a hollow structure that floats in water in one direction and has a curved shape. The floating structure is installed on the bottom of the water between the jetty and makes contact with the inside of the waterway of the floatation underwater. Since it has a curved reaction force wall that conforms to the shape of the deadline, it is possible to install a seawall that has a simple structure and is easy to maintain even in narrow waterways. Further, since the floating body closing work of the floating body structure can be opened and closed only by turning, the opening and closing time of the water channel can be shortened. Furthermore, since it has a curved shape, it can withstand high water pressure.

Further, in the floating body type seawall according to the present invention,
Further, since the water stop plate is provided on the inner surface of the water channel of the floating body cut-off work, facing the reaction force wall, the tide effect can be enhanced.

Further, in the floating body type seawall according to the present invention,
Further, since the floating body cut-out has a 6-degree-of-freedom structure because the floating body cut-out has a free floating structure, the center of gravity of the floating body cut-out is located at the lower side from the center. Is easier and easier to maintain.

Further, in the floating body type seawall according to the present invention,
Furthermore, while connecting the floating body cut-off work and the jetty with a pulling rope, at least one of the floating body cut-off work and the jetty is provided with a winch of the pulling rope, and the pulling rope is fed to a length that is sunk to the bottom of the water when the water channel is opened. The opening and closing structure is simple and there is no hindrance to the navigation of the vessel.

Further, in the floating body type seawall according to the present invention,
Since the floating body closing work has a wave pressure reducing shape outside the water channel, the floating body closing work can be stabilized.

Further, in the floating body type seawall according to the present invention,
By providing a plurality of ballast chambers and pouring / draining means for pouring / draining the ballast chambers in the floating body cut-off work, it is possible to widen the range of the head difference of storm surge that can be dealt with.

Further, in the floating type seawall according to the present invention,
Since the floating body cut-out has a divided structure in the longitudinal direction and each floating body cut-out piece is connected by the connecting rope, damage to the floating body cut-out can be prevented and the weight can be reduced.

Further, in the floating body type seawall according to the present invention,
It is possible to contribute to the local residents by using a floating disaster prevention base having a function of complementing the port, or by using the inside of the floating deadline as a disaster facility including a human shelter.

Further, in the floating type seawall according to the present invention,
By using a ship, preferably a stretched ship, as the floating body deadline, effective use of resources can be promoted.

Further, in the floating body type seawall according to the present invention,
Since the floating deadline itself has a function as a ship, it can be used as a transportation means in the event of a disaster.

Further, in the maintenance method for a floating type seawall according to the present invention, maintenance work is easy because the floating body shutoff work is separated from the pulling rope and towed to the ship and the maintenance is carried out at another place.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a floating body type seawall according to Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view of the floating body type seawall shown in FIG.

FIG. 3 is an explanatory view showing the movement of the floating body cut-off work shown in FIG. 1.

FIG. 4 is an explanatory diagram showing a state of maintenance.

[Fig. 5] Fig. 5 is a configuration diagram showing a floating body cut-off work of a floating body type seawall according to Embodiment 2 of the present invention.

FIG. 6 is a configuration diagram showing a floating type seawall according to Embodiment 3 of the present invention.

FIG. 7 is a configuration diagram showing a floating body type seawall according to Embodiment 4 of the present invention.

FIG. 8 is a plan view showing a floating body type seawall according to Embodiment 5 of the present invention.

FIG. 9 is a configuration diagram showing a floating type seawall according to Embodiment 6 of the present invention.

FIG. 10 is a configuration diagram showing a floating body type seawall according to Embodiment 7 of the present invention.

FIG. 11 is an explanatory diagram showing an example of stretching work on a waste ship tanker.

FIG. 12 is a configuration diagram showing a conventional sector type sea tide gate.

[Explanation of symbols]

100 floating seawall 1 jetty 2 protrusion 3 waterways 4 Floating body deadline 5 lighthouses 6 pillars 7 Wave pressure reduction shape 8 water stop plate 9 grooves 10 Undersea reaction wall 11 Pulling rope 12 winches 13 Planting

Claims (14)

[Claims] 1. A jetty installed on both sides of a waterway, and moving between the jetty to cut off the waterway, and having a degree of freedom in at least the y-axis direction, the z-axis direction, and the a-axis rotation direction, In addition, a floating levee with a hollow structure floating structure that floats on the water that is long in one direction, and a reaction wall that is installed on the bottom of the water between the jetty and contacts the inside of the waterway of the floating structure with water underwater. . 2. A jetty installed on both banks of a waterway, and one end of the jetty is connected to one jetty by a connecting line. The jetty is swung around the jetty with the one end as a center to close the waterway, and The floating structure has 6 degrees of freedom, and is a hollow structure floating structure with a structure that floats on the water long in one direction, and is installed in the bottom of the water between the jetty to make contact with the inside of the water channel of the floating structure. A floating type seawall with a reaction wall. 3. A jetty installed on both banks of a waterway, and one end of each jetty is connected to each jetty by a connecting cable. The waterway is closed between the jetty and the jetty by turning around the one end, and a free floating body is formed. With the structure, it has 6 degrees of freedom and is a hollow structure with a hollow structure that floats above water in one direction and has a curved shape. It is installed on the bottom of the water between the jetty and the inside of the waterway of the floatation diversion. A floating body type seawall, which is in contact with and has a curved reaction force wall that follows the shape of the floating body cutoff. 4. The floating body according to any one of claims 1 to 3, further comprising a water stop plate provided on an inner side surface of the water passage of the floating body cutoff and facing the reaction force wall. Type seawall. 5. The floating body shut-off structure according to claim 1, wherein the floating body shut-off structure has six degrees of freedom by having a free floating body structure, and the center of gravity thereof is located below the center. Seawall. 6. The winch of the pulling rope is provided on at least one of the floating dam and the jetty, and the pulling rope is sunk to the bottom of the water when the waterway is opened. The floating body type seawall according to any one of claims 1 to 5, which is extended. 7. The floating body type seawall according to claim 1, wherein the floating body cutoff has a wave pressure reducing shape outside the water channel. 8. The floating sea tide embankment according to claim 1, wherein the floating body cutoff has a plurality of ballast chambers and a pouring / draining means for pouring / draining the ballast chambers. 9. The floating sea levee according to claim 1, wherein the floating body cut-off structure has a divided structure in a longitudinal direction, and each floating body cut-off piece is connected by a connecting line. 10. The floating body according to claim 1, wherein the floating body deadline is a floating disaster prevention base having a port complementing function, or a disaster facility including a human evacuation center. Type seawall. 11. The floating body type seawall according to claim 1, wherein the floating body cutoff is a ship diversion. 12. The floating body type seawall according to claim 1, wherein the floating body cutoff is a stretched ship. 13. The floating type seawall according to any one of claims 1 to 10, wherein the floating body cutoff itself has a function as a ship. 14. A jetty installed on both banks of a waterway, and moving between the jetty to cut off the waterway, and having a degree of freedom at least in the y-axis direction, the z-axis direction, and the a-axis rotation direction,
And a floating structure deadline with a hollow structure that floats on water long in one direction,
A reaction wall that is installed on the bottom of the water between the jetties and contacts the inside of the waterway of the floating body demarcation in water, and connects the floating body demarcation and the jetty with a pulling rope, and at least the floating body demarcation and the jetty A winch of a pulling line is provided on one side, and the pulling line configures a floating type seawall so that the floating line is extended to a length where it is sunk to the bottom of the water when the channel is opened, and the floating body cutoff is separated from the pulling line and towed to the vessel, How to maintain a floating seawall in another place.