JP2021080760A - Floating type artificial ground, and floating type disaster prevention house - Google Patents

Abstract

To provide a floating type artificial ground and a floating type disaster prevention house which reduce response of earthquake, smoothly float and rise along with an increase in a water level and thereby can avoid damage from earthquake, flood, fire and tsunami, and have simple structures and are inexpensive.SOLUTION: A floating type disaster prevention house 1 has a structure such that a house 100 is built on a floating type artificial ground 10. A floating ground 20 floats on storage water W stored in a water tank 30 in a state where a partial weight is supported by vertical supports 60. A connection member 50 fixed to the floating ground 20 is slidably inserted into a guide support 40 fixed to a ground surface 200 in a vertical direction. The connection member 50 is elastically supported in a horizontal direction to the guide support 40 by an annular spring 52. A bottom surface 20a is fixed with flap members 21 having flow holes 22. The house 100 is a two-storied house provided with an inner court 110, and has a solar panel 130 provided on the roof floor thereof, and the inner court 110 has a parking space for storing a passenger car 120.SELECTED DRAWING: Figure 1

Description

The present invention relates to a floating artificial ground that normally floats in a water tank and rises along a guide column when the water level rises due to a flood or the like, and a floating disaster prevention house.

In recent years, many disasters beyond expectations have occurred. For example, on January 17, 1995, the Great Hanshin-Awaji Earthquake occurred. This earthquake is a so-called direct earthquake that occurred inland, causing extremely large pitching and rolling near the destroyed fault, and the houses collapsed and an earthquake fire broke out in the Hanshin area centered on Kobe City. It suffered a great deal of damage. The Great East Japan Earthquake struck on March 11, 2011. This earthquake is a combination of three subduction-zone earthquakes, and it is said that major fault ruptures occurred off the coast of Miyagi prefecture, further off the coast of Miyagi prefecture, and near the land off the northern part of Ibaraki prefecture. In addition to the collapse of buildings, earthquake fires also occurred, and the tsunami caused by the earthquake caused enormous damage to the coastal areas. Furthermore, Typhoon No. 19, which occurred over the eastern sea of the Mariana Islands on October 6, 2019, landed in Japan on the 12th. The typhoon continued to rain heavily over a wide area. Due to this heavy rain, the banks of the Abukuma and Chikuma rivers broke, and the rivers flooded and broke one after another. It is said that the inundation area exceeded the heavy rain in western Japan (about 18,500 hectares), which occurred in July 2018 and became an unprecedented heavy rain.

As a countermeasure, it is considered possible to respond to these disasters by taking measures such as building a house on a hill. However, it is not realistic for all houses to be relocated to higher ground, and even if such measures are taken, damage such as inundation cannot be prevented. For example, during heavy rain, rainwater may flow back from the manhole and spout out beyond the drainage capacity of the rainwater, causing frequent inundation damage even in relatively high-rise houses. In the Great East Japan Earthquake, inundation damage and submersion damage due to the tsunami have occurred even on relatively high lands.

In addition, there are large-scale fires. The large-scale fire in Itoigawa City that broke out in Itoigawa City before noon on December 22, 2016 continued to burn for about 30 hours after the outbreak. On the day of the fire, a foehn phenomenon occurred in which a warm southerly wind blew over the mountains to the Sea of Japan side and at the same time dried the air and raised the temperature, which is thought to have contributed to the large-scale fire. There is.

In view of the above situation, residential areas are required to take measures against collapse of houses in the event of an earthquake, measures against inundation in the event of a flood, measures to prevent the spread of fire in the event of a fire, and evacuation measures in the event of a tsunami.

Patent Document 1 discloses a seismic isolation building for flood damage, which is a building that reduces the acceleration of rocking due to an earthquake to the building to prevent the building from being damaged and overturned, and further prevents the building from being flooded in the event of a storm surge. ing. Patent Document 2 discloses an artificial ground floating structure for evacuation to prevent the structure from collapsing during an earthquake and to avoid flooding of the structure during a flood.

However, the invention disclosed in Patent Document 1 has a problem that it is assumed that the vibration damping performance is not sufficient, or the apparatus becomes complicated when the vibration damping performance is sufficient. Furthermore, when the water level rises and the floating body rises, the anchor pole that serves as a guide may not be sufficiently fixed and a stable rise may not be possible.

The invention disclosed in Patent Document 2 has a structure on the premise that the guide support column is deformed to suppress vibration during an earthquake, and when the water level rises, the guide support column rises along the deformed guide support column. Therefore, when the water level rises due to the tsunami caused by the earthquake, there is a risk that it will not rise smoothly. Further, since a special vibration damping device such as a laminated rubber plate is used for the purpose of enhancing the vibration damping effect, the structure is complicated and expensive.

JP-A-2007-77758 Japanese Unexamined Patent Publication No. 2014-8977

An object of the present invention is to reduce the response of an earthquake, and to ascend and rise smoothly as the water level rises, thereby avoiding damage from an earthquake, flood, fire, or tsunami. It is to provide floating artificial ground and floating disaster prevention housing.

The invention for solving the above problems is a floating artificial ground, which is fixed to a water tank filled with stored water, a floating ground floating on the water surface while floating in the stored water, and an external region of the water tank. A plurality of guide struts projecting upward and a connecting member fixed to the floating ground and provided with an insertion hole for slidably inserting the guide stanchion are provided, and the connecting member defines the insertion hole. It is characterized by having an annular spring that becomes an annular elastic body.

According to this configuration, in the event of an earthquake, the response acceleration and response displacement of the floating ground can be reduced by the interaction between the floating ground floating in the stored water and the annular spring. Specifically, when the floating ground moves in the stored water, a part of the water existing in the gap between the water tank and the floating ground is pushed to increase the pressure and is discharged to the other part. In addition, the discharged water does not move the floating ground. As a result, the energy when the floating ground moves is converted into the energy for discharging water. It is said that the damping force when the floating ground moves in water depends on the relative moving speed of the floating ground and the water tank. Furthermore, since the floating ground is elastically supported by an annular spring, the displaced and moved floating ground returns to its original position due to the restoring force of the spring. That is, the floating artificial ground is a structural system having a vibration damping function in which a spring and a dashpot are connected in series, and has a simple configuration without using a special vibration damping device applied to a structure such as a damper. It constitutes a structural system having a vibration damping function.
Further, according to this configuration, in the event of an earthquake, the force applied to the guide support via the connecting member becomes small, and even immediately after the earthquake, the guide support remains fixed in the outer region of the water tank and has the original shape. Can be maintained. As a result, even when a tsunami strikes immediately after an earthquake and the surrounding water level rises, the floating ground can be smoothly raised along the guide columns.

Preferably, the annular spring comprises an air tube filled with air in a donut-shaped enclosed interior space.

According to this configuration, since the annular spring includes an air tube filled with air in a donut-shaped sealed internal space, the spring constant can be appropriately and appropriately set by changing the air pressure. In addition, the weight can be reduced as compared with a rubber-based elastic body.

Preferably, the floating ground is provided with a flow hole for passing the stored water when a relative displacement occurs between the floating ground and the stored water.

According to this configuration, the damping force when the floating ground moves in the stored water can be further increased by passing the stored water through the flow hole.

Preferably, the floating ground has a flap member that is fixed to the bottom surface in a cross-assembled state and is provided with a flow hole.

According to this configuration, when the floating ground moves in the stored water, a part of the stored water moves toward the position where the cross-shaped members intersect. At this time, the water pressure in the vicinity of the flap member rises as compared with the surroundings. When the stored water with increased water pressure passes through the flow hole, it requires more energy to move the floating ground. That is, the damping force when the floating ground moves in the stored water is further increased.

Preferably, a vertical support that elastically supports a part of the weight of the floating ground is provided.

According to this configuration, since the floating ground is supported by both the buoyancy of the stored water and the vertical support, it is possible to suppress the displacement in the vertical direction as compared with the state of being supported only by the stored water in the normal state. .. Further, in the vertical direction as well, the structure system has a vibration damping function in which a spring and a dashpot are connected in series, and even when a direct earthquake occurs, the response acceleration and the response displacement in the vertical direction due to the earthquake can be reduced.

Preferably, a lift device for ascending / descending the floating ground along the guide column is provided.

When a huge tsunami strikes and the sea level rises at once, it is assumed that the floating ground will not catch up with the rise and will be swallowed by the seawater. However, according to this configuration, a lift device for raising and lowering the floating ground along the guide columns is provided, so in a situation where a huge tsunami is expected to hit, the lift mechanism predicts the floating ground in advance. By raising it to a position higher than the rise, it is possible to avoid damage caused by being caught in a huge tsunami and flooding.

Preferably, the lift device is provided on a guide post and has a carriage that rises and falls along the guide post.

According to this configuration, since the bogie is provided on the guide column, it is not necessary to separately set up the support structure required for ascending and descending the floating ground.

Preferably, it is provided with a guide strut and / or a sprinkler that discharges the water supplied from the stored water toward the floating ground.

According to this configuration, the water used in the sprinkler is stored water having a large storage capacity, and a part of the discharged water can be returned to the water tank, so that when a fire breaks out, the water can be discharged for a long time. As a result, it is possible to avoid the spread of fire in the guide columns and the floating ground, and the deformation due to the heat of the flame.

Another invention for solving the above-mentioned problems is a floating disaster prevention house, characterized in that it includes the above-mentioned floating artificial ground and a house provided on the upper surface of the floating artificial ground.

According to this configuration, the house is installed on the upper surface of the floating artificial ground that avoids damage from earthquakes, floods, fires, and tsunamis, so it has high disaster prevention performance against earthquakes, floods, fires, and tsunamis. ..

(A) is a front sectional view of a floating disaster prevention house, and (b) is a plan view of the same. It is the bottom view and the partial perspective view explaining the attachment state of the flap member. It is a partial plan sectional view of a guide column and a connecting member. It is a partial front sectional view of a guide support, a carriage, and a connecting member. It is a front view explaining the state at the time of a flood. (A) and (b) are front views explaining the response at the time of the invasion of Tsuuchi.

Embodiments of the present invention will be described with reference to FIGS. 1 to 6.

As shown in FIGS. 1A and 1B, in the floating disaster prevention house 1 (hereinafter referred to as disaster prevention house 1), a house 100 is built on the floating artificial ground 10 (hereinafter referred to as artificial ground 10). It is a structure. The floating ground 20 is suspended in the stored water W stored in the water tank 30 in a state where a part of the weight is supported by the vertical support 60. Further, it is slidably fixed to the guide column 40 fixed to the ground 200 via the connecting member 50. The house 100 is a two-story house with a courtyard 110, and a solar panel 130 is provided on the roof. The courtyard 110 is provided with a parking space that can accommodate the passenger car 120. It is preferable that the center of gravity of the house 100 coincides with the center of gravity of the floating ground 20 in a plan view. As a result, the house 100 floats in the stored water W while maintaining a horizontal state.

The artificial ground 10 includes a floating ground 20, a water tank 30, a guide support column 40, a connecting member 50, and the like.

The water tank 30 is made of reinforced concrete and has a bottom plate 30a and a side wall 30b extending vertically upward from the outer peripheral end of the bottom plate 30a. Further, the stored water W for suspending the floating ground 20 is stored in the recess 31 opened upward. It is preferable that the water tank 30 has a predetermined watertightness and has a structure capable of preventing leakage of the stored water W.

The sprinkler 80 has a first sprinkler 81 and a second sprinkler 82, and is fixed to the side wall 30b. The first sprinkler 81 is for discharging water toward the guide support column 40, and is arranged so as to sandwich the connecting member 50. The second sprinkler 82 is for discharging water toward the floating ground 20 and the house 100, and is arranged so as to surround the floating ground 20 from all sides. The stored water W is used as the water to be supplied to the sprinkler 80.

The floating ground 20 is a substantially rectangular parallelepiped hollow structure made of steel having a bottom surface 20a, a side surface 20b, and an upper surface 20c, and the inside is partitioned into a plurality of small rooms by a partition wall 23. A house 100 is built on the upper surface 20c, and connecting members 50 are fixed to the four corners of the upper surface 20c. Further, the flap member 21 is fixed to the bottom surface 20a.

The vertical support 60 is a spring that expands and contracts in the vertical direction, and is normally arranged in a gap between the connecting member 50 and the ground 200 in a state of supporting a part of the weight of the floating ground 20. That is, the compressive force is urged in the normal state. Further, the lower end is fixed to the ground 200, and the upper end has a structure in which it comes into contact with the connecting member 50 and can slide with each other. As a result, the floating ground 20 is supported in the vertical direction by both the buoyancy of the stored water W and the vertical support 60. Therefore, in the normal state, the floating ground 20 is supported in the vertical direction as compared with the state of being supported only by the stored water W. Displacement can be suppressed.

As shown in FIG. 2, the flap member 21 is fixed to the bottom surface 20a of the floating ground 20. It has a cross-shaped structure, and each member extends in the diagonal direction of the bottom surface 20a and intersects at the center. The cross section is T-shaped composed of the web 21a and the flange 21b, and the web 21a is fixed to the bottom surface 20a. Further, the web 21a is provided with a flow hole 22.

The guide column 40 is fixed to the ground 200 in the outer region of the water tank 30 in a state of being inserted into the insertion hole 50a. As shown in FIG. 3, the guide support column 40 is a substantially cylindrical member extending in the vertical direction in which the upper and lower ends are closed, and three rails 41 extending in the vertical direction and one rack 42 are arranged. There is. The rail 41 is for restraining the horizontal rotation of the connecting member 50 and guiding it in the vertical direction, and the rack 42 is a saw-shaped member for raising and lowering the carriage 70. ..

As shown in FIGS. 3 and 4, the connecting member 50 has a connecting portion 51 and an annular spring 52. The connecting portion 51 is a member having an I-shaped cross section, one end of which is fixed to the floating ground 20 and the other end of which is connected to the annular spring 52. The annular spring 52 is defined with an insertion hole 50a for slidably inserting the guide support column 40.

The annular spring 52 has an outer annular member 54 connected to the connecting portion 51, an inner annular member 55 defining the insertion hole 50a, and a donut-shaped air tube 53 sandwiched between the outer annular member 54 and the inner annular member 55. doing. The air tube 53 has a structure in which air is filled in a closed space, and is a donut-shaped air spring that is deformed by compression and expansion of air. Further, a valve (not shown) for filling the inside with air is provided.

The inner annular member 55 is a member having a substantially cylindrical shape, the outer surface is in contact with the air tube 53, and the holding plate 56 for sandwiching the rail 41 from both sides is fixed to the inner surface. Further, the holding plate 56 and the guide support column 40 are provided with a predetermined distance, and the rail 41 is in contact with the inner surface of the inner annular member 55.

The outer annular member 54 is a member having a substantially cylindrical shape, and its inner surface is in contact with the air tube 53. Further, a flange portion 54a extending at a right angle toward the inside in the radial direction is provided at the lower end. When the carriage 70 rises and falls, the collar portion 54a comes into contact with the carriage 70 and causes the carriage 70 to bear the weight of the floating ground 20.

The carriage 70 is provided below the annular spring 52 so as to surround the guide support column 40. The bogie 70 has a bogie main body 71 that rises and falls along the guide column 40 when driven, and a support plate 72 provided at the upper end of the bogie 70. Further, the bogie body 71 has wheels (not shown) that rotate along the rail 41, a motor (not shown) that serves as a drive source, and gears (not shown) that are rotated by the motor.

The behavior of the disaster prevention house 1 at the time of an earthquake will be described.

When an earthquake occurs, the ground 210 is greatly vibrated in the horizontal direction and displaced. On the other hand, the floating ground 20 behaves differently from the ground 210 because it is connected to the ground 210 via the guide column 40 and the connecting member 50 having the air tube 53 in a state of being suspended in the stored water W.

This behavior will be specifically described. Due to the force of the spring of the air tube 53, the floating ground 20 tries to make a periodic motion in which a predetermined period is excellent. At this time, a relative displacement occurs between the stored water W and the floating ground 20, and a part of the stored water W is pushed to increase the pressure and is discharged to the other part. As a result, the energy that the floating ground 20 moves in the stored water W is converted into the energy that the stored water W is discharged. At the same time, a part of the stored water W tends to move toward the position where the cross-shaped members of the flap member 21 intersect. At this time, the water pressure in the vicinity of the flap member 21 vigorously passes through the flow hole 22 in a state of being higher than the surroundings. As a result, the energy that the stored water W is pushed into the flow hole is converted into the energy that vigorously passes through the flow hole 22. The damping force when these energy conversions occur depends on the speed at which the floating ground 20 is displaced. Due to the energy conversion described above, the floating ground moves in the stored water W while receiving a damping force. Since the floating ground 20 that has moved in the stored water W is elastically supported by the air tube 53, it tries to return to its original position by the restoring force of the spring.

As described above, the artificial ground 10 is a structural system including a vibration damping mechanism in which a spring and a speed-dependent dashpot are connected in series. By appropriately setting the spring constant of the air tube 53, the mounting position, size, and number of flow holes, and the gap provided between the floating ground 20 and the side wall 30b, the response acceleration of the floating ground 20 due to an earthquake is set appropriately. Etc. can be reduced, and damage to the house 100 can be avoided. Further, with respect to the guide support column 40, the seismic force generated by the seismic response of the floating ground 20 can be reduced. As a result, the guide support column 40 can be kept in its original state without being damaged in the event of an earthquake, so that the floating ground 20 can be smoothly raised and lowered.

Although the seismic behavior in which the horizontal acceleration is predominant has been described, the response acceleration caused by the earthquake can be reduced by the same mechanism even in the case where a large vertical acceleration occurs as in the case of a direct earthquake.

The response in the event of a fire will be explained.

When a fire breaks out, the first sprinkler 81 is operated to discharge water toward the guide column 40. At the same time, the second sprinkler 82 is operated to discharge water toward the floating ground 20. Due to the latent heat effect of the discharged water, the temperature rise of the guide column 40, the floating ground 20, and the house 100 is suppressed, and fire damage can be avoided. As the water supplied to the sprinkler 80, the stored water W having a large storage capacity is used. Further, a part of the water discharged toward the floating ground 20 is returned to the water tank 30 and becomes the stored water W again. In this way, since a large amount of water can be efficiently and effectively used, it is possible to discharge water for a long period of time.

The behavior during a flood will be described with reference to FIG.

When the surrounding water level gradually rises due to the occurrence of a flood, the floating ground 20 receives buoyancy as the water level rises. As a result, the floating ground 20 gradually rises along the guide column 40. Further, the connecting member 50 and the vertical support 60 are separated from each other. Since the floating ground 20 is constrained by the guide columns 40 in displacements other than the vertical direction, the floating ground 20 is not washed away by the turbid flow. As the flood subsides and the water level drops, the floating ground 20 descends and fits into the water tank 30.

The response to the tsunami attack will be described with reference to FIGS. 6 (a) and 6 (b).

When an earthquake occurs and a tsunami is expected to strike, the trolley 70 is operated to raise the floating ground 20 in advance. The dolly 70 moves up and down along the guide column 40 by driving the motor to rotate the gears and engaging the rotated gears with the rack 42. When the carriage 70 is raised, the support plate 72 and the flange portion 54a come into contact with each other to raise the connecting member 50. Along with this, the floating ground 20 rises. It is preferable that the rising height is higher than the initial wave height of the first wave of the tsunami. By placing the floating ground 20 at the height of this state, the house 100 will not be swallowed by the tsunami even when a tsunami that suddenly raises the wave height strikes. When it is difficult to predict the wave height of the first wave of the tsunami, the floating ground 20 is raised to the maximum height that can be raised (see FIG. 6A).

When the wave height of the tsunami becomes higher and the sea level rises, the floating ground 20 rises further due to buoyancy. When the height of the lower end of the connecting member 50 becomes higher than the height of the upper end of the guide column 40, the floating ground 20 separates from the guide column 40 and drifts depending on the flow of the tsunami. Since it drifts together with the house 100, it can be evacuated in the house for a long time (see FIG. 6 (b)). Further, even during a flood, the trolley 70 may be operated to raise the floating ground 20 to a position higher than the water level of the flood, as in the case where a tsunami is expected to strike. Thereby, the resistance of water due to the turbid flow can be reduced.

This embodiment is an example, and it goes without saying that it can be modified without departing from the technical idea of the present invention. For example, four guide columns have been installed, but the number may be two, three, or five or more. Further, although the flow holes are provided in the web of the flap member fixed to the bottom surface, they may be provided in each of a plurality of plates fixed to the side surface and / or the bottom surface. Further, although the flap member is provided on the bottom surface, it may be provided on the side surface. Further, in the present embodiment, the floating ground is raised and lowered by using the trolley provided on the guide support as a lift device, but the trolley may be provided on the separately installed support. Further, a configuration that does not use a trolley, for example, a configuration that is substantially the same as the lift device of a forklift may be used.

The disaster prevention house according to the present invention can protect the house in a wide range of cases against earthquakes, fires, floods, and tsunami disasters. In addition, by providing a parking lot, automobiles can be protected from disasters, so their industrial applicability is great.

1: Disaster prevention housing 10: Artificial ground 20: Floating ground 21: Flap member 22: Flow hole 30: Water tank 40: Guide support 50: Connection member 50a: Insertion hole 52: Circular spring 53: Air tube 60: Vertical support 70: Cart 80: Sprinkler 100: House W: Storage water

The invention for solving the above problems is a floating artificial ground, which is fixed to a water tank filled with stored water, a floating ground floating on the water surface while floating in the stored water, and an external region of the water tank. It is provided with a plurality of guide columns protruding upward and a connecting member fixed to the floating ground and provided with an insertion hole for slidably inserting the guide column, and the connecting member defines the insertion hole. have a circular spring comprising an annular elastic member, the floating ground is fixed to the bottom in a state of being assembled in a cross, having a flap member provided a flow hole, the flow holes, the floating ground and stored water It is characterized in that when a relative displacement occurs in the water, the stored water is passed through.

According to this configuration, in the event of an earthquake, the response acceleration and response displacement of the floating ground can be reduced by the interaction between the floating ground floating in the stored water and the annular spring. Specifically, when the floating ground moves in the stored water, a part of the water existing in the gap between the water tank and the floating ground is pushed to increase the pressure and is discharged to the other part. In addition, the discharged water does not move the floating ground. As a result, the energy when the floating ground moves is converted into the energy for discharging water. It is said that the damping force when the floating ground moves in water depends on the relative moving speed of the floating ground and the water tank. Furthermore, since the floating ground is elastically supported by an annular spring, the displaced and moved floating ground returns to its original position due to the restoring force of the spring. That is, the floating artificial ground is a structural system having a vibration damping function in which a spring and a dashpot are connected in series, and has a simple configuration without using a special vibration damping device applied to a structure such as a damper. It constitutes a structural system having a vibration damping function.
Further, according to this configuration, in the event of an earthquake, the force applied to the guide support via the connecting member becomes small, and even immediately after the earthquake, the guide support remains fixed in the outer region of the water tank and has the original shape. Can be maintained. As a result, even when a tsunami strikes immediately after an earthquake and the surrounding water level rises, the floating ground can be smoothly raised along the guide columns.
Further, according to this configuration, the damping force when the floating ground moves in the stored water can be further increased by passing the stored water through the flow hole.
Further, according to this configuration, when the floating ground moves in the stored water, a part of the stored water moves toward the position where the cross-shaped members intersect. At this time, the water pressure in the vicinity of the flap member rises as compared with the surroundings. When the stored water with increased water pressure passes through the flow hole, it requires more energy to move the floating ground. That is, the damping force when the floating ground moves in the stored water is further increased.

Claims (9)

An aquarium filled with stored water and
Floating ground that floats on the surface of the water while floating in the stored water,
A plurality of guide columns fixed to the outer region of the water tank and projecting upward,
A connecting member fixed to the floating ground and provided with an insertion hole for slidably inserting the guide support column.
The connecting member is a floating artificial ground having an annular spring that is an annular elastic body that defines the insertion hole. The floating artificial ground according to claim 1, wherein the annular spring includes an air tube filled with air in a donut-shaped sealed internal space. The floating artificial ground according to claim 1 or 2, wherein the floating ground is provided with a flow hole for passing the stored water when a relative displacement occurs between the floating ground and the stored water. .. The floating artificial ground according to claim 3, wherein the floating ground is fixed to the bottom surface in a cross-shaped state and has a flap member provided with the flow hole. The floating artificial ground according to any one of claims 1 to 4, further comprising a vertical support that elastically supports a part of the weight of the floating ground. The floating artificial ground according to any one of claims 1 to 5, further comprising a lift device for raising and lowering the floating ground along the guide column. The floating artificial ground according to claim 6, wherein the lift device is provided on the guide support and has a carriage that rises and falls along the guide support. The floating artificial ground according to any one of claims 1 to 7, further comprising a sprinkler that discharges water supplied from the stored water toward the guide column and / or the floating ground. .. The floating artificial ground according to any one of claims 1 to 8,
A floating disaster prevention house characterized by having a house provided on the upper surface of the floating artificial ground.

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