Floating insulating structure

Abstract

To provide a floating insulating structure in which a structure body installed inside a water tank is floated by utilizing the buoyancy of water, thereby reducing the influence on the structure in the event of a disaster such as an earthquake.SOLUTION: A floating insulating structure 1 according to the present invention has a structure body 2 installed inside a water tank body 3, and is insulated from the ground by floating the structure body 2 by using the buoyancy of the water inside the water tank body 3, and is provided with a float 5 installed on the outer periphery of the structure body 2 for floating the structure body 2, and buoyancy adjustment means for applying a tensioning force in the opposite direction to the buoyancy acting on the float 5. Under normal circumstances, the buoyancy acting on the structure body 2 is suppressed by pulling down the float 5 with the buoyancy adjustment means, and the structure body 2 can be grounded within the water tank body 3, and in the event of an earthquake or flood, the tensioning force of the buoyancy adjustment means on the float 5 can be relaxed to allow the structure body 2 to float.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a floating insulated structure in which the main body of the structure is placed inside a water tank frame, floated using the buoyancy of the water, and insulated from the ground, thereby reducing the impact on the main body of the structure in the event of a disaster such as an earthquake. [Background technology]

[0002] In recent years, earthquake-proof structures that can withstand earthquake motion and seismic isolation structures that release earthquake motion have been considered as earthquake countermeasures for structures. Another type of structure that isolates structures from earthquake motion is the isolation structure. An isolation structure is a structure in which the edge of the building is separated from the ground, making it difficult for earthquake motion to be transmitted to the building.

[0003] In addition, there are various types of insulation structures, such as those that levitate buildings using air and those that levitate using magnetism. However, air levitation has an issue with insufficient levitation force, and magnetic levitation is unstable in the horizontal direction, so the sides need to be supported, and it does not provide complete insulation. Therefore, structures that utilize the buoyancy of water have been developed, such as the inventions described in Patent Documents 1 to 6.

[0004] Patent Document 1 describes a floating seismic isolation structure that has seismic isolation properties by floating in a fluid. The floating seismic isolation structure comprises a structure body, and a plurality of divided air chambers surrounded by partitions extending vertically downward from the bottom of the structure body, with the bottom of the structure body as the upper surface, and a membrane is provided near the bottom of the air chamber so as to contact the fluid surface, sealing the air chamber, and the air chamber has a layer structure that communicates with the air and is divided vertically.

[0005] Patent Document 2 discloses a storm surge-resistant building that houses a barge-type float with a building constructed on top inside a pool foundation, a container structure that is installed underground and has side walls and a bottom that open upward, and has an inlet for storm surge water inflow, and an anchor device is provided between the barge-type float and the pool-type foundation so that the float can move only up and down and cannot move horizontally, so that when the pool-type foundation becomes waterlogged, the float is raised only vertically upward, and the anchor device prevents the float from moving horizontally due to flowing water, and the anchor device is configured so that the side of the float abuts against a guide wall that is integral with the foundation and extends vertically, thereby preventing the float from moving horizontally due to flooding.

[0006] Patent Document 3 discloses an architectural structure comprising a surrounding structure having a base plate provided in a depression in the ground and side walls erected on the periphery of the base plate, liquid stored inside the surrounding structure, a buoyant structure whose planar shape is circular or a polygon with at least a hexagon, the upper part of which extends above the surface of the liquid, an upper structure (hereinafter, the upper structure and the buoyant structure are collectively referred to as the "main structure") constructed on top of the buoyant structure, and a rotational drive mechanism provided between the buoyant structure or the upper structure and the surrounding structure or the ground, which rotates the main structure around a vertical axis, the liquid being stored within the surrounding structure to a depth or above which the buoyant force due to the liquid acting on the buoyant structure is equal to the total weight of the main structure, and the main structure floats in the liquid and is capable of rotating around the vertical axis.

[0007] Patent Document 4 discloses a floating seismic isolation structure in which a water-permeable wall is constructed by digging into ground with a high groundwater level, and a box foundation is immersed and floated in a pool of groundwater that communicates with the groundwater in the surrounding ground. The box foundation is moored to a part of the surrounding ground and is capable of rising and falling in response to fluctuations in the groundwater level.

[0008] Patent Document 5 discloses a floating seismic isolation structure that has seismic isolation properties by floating in a fluid, the floating seismic isolation structure comprising a structure main body and an air chamber provided on the side of the structure main body, the air chamber being composed of a protruding slab attached horizontally to the outer wall of the structure main body and a bulkhead extending vertically downward from the tip of the protruding slab.

[0009] Patent Document 6 discloses a method for elastically mooring a float in a floating-body vibration isolation device, which uses a liquid tank and a float floating in the liquid inside the tank to isolate structures on the float or various devices and equipment, and which is characterized in that a cylindrical or columnar body made of a soft elastic material is used as a support for the float, and the support is placed in the liquid tank in contact with both the liquid tank and the float, and both sides of the float are elastically moored. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Patent No. 4134210 [Patent Document 2] JP 2007-192007 A [Patent Document 3] JP 2007-085071 A [Patent Document 4] Patent No. 3870371 [Patent Document 5] Patent No. 3894476 [Patent Document 6] JP 2003-021192 A Summary of the Invention [Problem to be solved by the invention]

[0011] The invention described in Patent Document 1 utilizes the buoyancy of the fluid in the seismic isolation pit, with multiple air chambers surrounded by partitions formed below the bottom of the main body of the structure, and membranes installed near the bottom of the air chambers to seal them. The membranes attached to the air chambers absorb the energy generated in the fluid when an earthquake or other event occurs, but the structure is unstable and may tilt.

[0012] The invention described in Patent Document 2 is a barge-type float with a building house housed inside the pool foundation, with an anchor device between the float and the foundation, which allows the float to only rise vertically upwards when submerged, preventing horizontal flow. Because the structure allows only vertical movement with the anchors, it is not an insulated structure, and is intended for buildings of the same size as a residential home where people live.

[0013] The invention described in Patent Document 3 is composed of a surrounding structure in which liquid is stored, a buoyant structure, and an upper structure, and the buoyancy acting on the buoyant structure is set to be equal to the total weight of the main structure. In addition, the main structure can rotate around a vertical axis while floating in the liquid, and is envisioned for use in rotating high-rise buildings and apartment buildings.

[0014] The invention described in Patent Document 4 is a floating seismic isolation structure in which a permeable wall is provided in ground with a high groundwater level, and a box foundation is floated in a pool that stores connected groundwater and is moored so that it can rise and fall in response to fluctuations in the groundwater level. It is described that bridge piers and superstructures are provided on top of the box foundation, and it is anticipated that it will be incorporated into building foundations such as bridge foundation structures.

[0015] The invention described in Patent Document 5 is a floating seismic isolation structure with an air chamber on the side of the structure body, and the air chamber is composed of a protruding slab attached horizontally to the outer wall of the structure body, and a bulkhead extending vertically downward from the tip of the protruding slab. Since the air chamber is provided on the side, not on the bottom of the structure body as in the invention described in Patent Document 1, the center of gravity of the entire structure is lowered downward, which may increase stability, but maintenance work on the air chamber is difficult.

[0016] The invention described in Patent Document 6 uses a cylindrical or columnar body made of a soft, elastic material as a support for the float to moor it in the liquid tank. However, since there is no fixed part and little consideration has been given to the buoyancy acting on the float, it is conceivable that if a structure is placed on top of the float, it will sink significantly.

[0017] The present invention aims to provide a floating insulated structure in which a structure with a float is provided inside a water tank, and the main body of the structure is raised by utilizing the buoyancy of the water while being insulated from the ground, thereby minimizing the impact on the main body of the structure in the event of a disaster such as an earthquake. [Means for solving the problem]

[0018] The floating insulation structure of the present invention is a floating insulation structure in which a structure main body is installed inside a water tank body and is insulated from the ground by floating the structure main body using the buoyancy of the water inside the water tank body, and the floating insulation structure is installed on the outer periphery of the structure main body and comprises a float for floating the structure main body and a buoyancy adjustment means for applying a tension force in the opposite direction to the buoyancy acting on the float, and the structure main body can be grounded inside the water tank body by pulling down the float with the buoyancy adjustment means under normal circumstances, and the buoyancy acting on the structure main body can be suppressed by grounding the structure main body within the water tank body during an earthquake or flood, and the tension force of the buoyancy adjustment means on the float is relaxed so that the structure main body floats.

[0019] The floating insulated structure of the present invention has a structure body installed inside the tank frame, and is isolated from earthquake vibrations by being insulated from the ground. A float is connected to the structure body by a buoyancy adjustment means. The buoyancy adjustment means is used to apply a tension force in the opposite direction to the buoyancy acting on the float, and can reduce the buoyancy of the float by pulling it down, or can float the float by reducing the tension applied to the float. By adjusting the floating of the float, the buoyancy acting on the structure body can be adjusted.

[0020] Under normal circumstances, the buoyancy of the float is adjusted by the buoyancy adjustment means so that it is smaller than the weight of the structure body, and the float is pulled down so that the structure body does not float up and remains on the ground in the tank body. In the event of an earthquake or flood, the tension on the float is relaxed by the buoyancy adjustment means so that the buoyancy of the float becomes larger than the weight of the structure body, and the structure body floats up.

[0021] In addition, the buoyancy adjustment means in the floating insulating structure of the present invention preferably includes a wire member connected to the float, and a winch for adjusting the winding length of the wire member to introduce and release tension.

[0022] The buoyancy adjustment means is preferably structured so that the buoyancy of the float can be adjusted by moving the position of the float up and down. In the present invention, it is preferable that the float is connected to the structure body using a wire member, and the tension can be introduced or released by adjusting the winding length of the connected wire member with a winch.

[0023] In addition, the float in the floating insulated structure of the present invention consists of a structure separated from the structure main body, and when tension is being introduced into the wire member by the winch, it is substantially separated from the structure main body, and by unwinding the wire member with the winch to release the tension, it comes into contact with a float contact portion formed on the outer periphery of the structure main body, and the buoyancy acting on the float is applied to the structure main body.

[0024] When tension is being introduced by winding up the wire member with the winch, the buoyancy of the float is suppressed and the structure body and the float are substantially separated. On the other hand, when tension is released by unwinding the wire member with the winch, the float rises and comes into contact with the float contact part formed on the outer periphery of the structure body, allowing the buoyancy of the float to act on the structure body.

[0025] The float in the floating insulated structure of the present invention may preferably include a steel frame constituting the outer shell of the float, and a tank provided inside the steel frame and filled with air. For example, if the outer shell of the float is formed by surrounding an air-filled tank with a steel frame, the tank is protected by the steel frame and durability is maintained.

[0026] In the floating insulated structure of the present invention, the foundation frame provided under the structure body may be provided with a space for storing load adjustment water for adjusting the weight of the structure body. The foundation frame provided under the structure body may be divided into a plurality of spaces, which may be used as spaces for storing load adjustment water for adjusting the weight of the structure body. The spaces may also be used as air tanks for supplementing buoyancy.

[0027] It is preferable that the main body of the floating insulating structure of the present invention is provided with an earthquake sensor for detecting earthquakes. If the earthquake sensor is provided and linked to the buoyancy control means, the floating body can be immediately floated by the buoyancy control means in the event of an earthquake, thereby floating the main body of the structure. Effect of the Invention

[0028] The present invention is a floating insulating structure as described above, and therefore has the following advantages.

[0029] (1) Under normal circumstances, tension is applied to the float by the buoyancy adjustment means to pull the float down, suppressing the buoyancy acting on the structure body and grounding the structure body within the tank frame, so that the structure body can be supported in a stable state and the effects of wind and waves can be reduced compared to when the structure body is always floating. Also, during an earthquake or flood, the buoyancy of the float is added to the structure body by releasing the tension on the float by the buoyancy adjustment means, and the structure body is floated to isolate it from the ground, making it possible to avoid the effects of earthquakes and floods.

[0030] (2) By configuring the buoyancy adjustment means by a wire member connecting the structure body and the float and a winch that adjusts the winding length of the wire member, the buoyancy acting on the structure body can be easily adjusted by introducing and releasing tension in the wire member.

[0031] (3) By providing a float contact part on the outer periphery of the structure body, the float that rises to the surface during an earthquake or flood comes into contact with the float contact part, and the buoyancy of the float acts on the structure body, causing it to float up. It also prevents the float from drifting away.

[0032] (4) If an earthquake sensor is installed on the main body of the structure and linked to a buoyancy control means, in the event of an earthquake, the buoyancy control means can immediately raise the float, thereby raising the main body of the structure, enabling a rapid response.

[0033] (5) By utilizing existing rivers, etc., the amount of underground excavation and disposal of soil can be reduced. [Brief description of the drawings]

[0034] [Figure 1] 1A and 1B are conceptual diagrams showing one embodiment of a floating insulating structure according to the present invention, in which (a) shows normal operation and (b) shows operation during an earthquake. [Diagram 2] 1 is a plan view showing an embodiment of a floating insulating structure according to the present invention; [Diagram 3] 1A and 1B are cross-sectional views showing one embodiment of a floating insulated structure according to the present invention, in which (a) shows normal conditions, (b) shows conditions during an earthquake, and (c) shows conditions during flood damage. [Figure 4] 1A and 1B are diagrams illustrating the restoring force of a floating body in a floating insulated structure according to the present invention, in which (a) shows the normal stationary state, and (b) shows the state when tilting occurs. [Diagram 5] 1A and 1B show an embodiment of a float structure used in a floating insulated structure according to the present invention, in which (a) is a front view and (b) is a view in a direction perpendicular to (a). [Figure 6]FIG. 1 is an image diagram of a floating insulating structure according to the present invention installed in a canal. [Figure 7] 1 is an image diagram showing a construction method for a floating insulation structure according to the present invention. [Figure 8] FIG. 8 is an image showing the next step in the embodiment of FIG. 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is an image diagram showing one embodiment of a floating insulated structure 1 according to the present invention. In the floating insulated structure 1 of the present invention, a structure body 2 is installed inside a water tank body 3, and is, for example, three stories tall above ground. A float contact part 9 is provided on the side of the structure body 2. The space in the foundation body 4 below the structure body 2 can also be used as an air tank 10. In this embodiment, an earthquake sensor 12 is installed in the foundation body 4.

[0036] Under normal circumstances, as shown in Fig. 1(a), the float 5 and the float contact part 9 are separated. The buoyancy adjustment means applies tension to the wire 6 to pull down the floating position of the float 5, preventing buoyancy from being applied to the structure body 2, and the bottom of the foundation body 4 is in contact with the water tank body 3.

[0037] When an earthquake is detected by the earthquake sensor 12 during an earthquake, as shown in Figure 1(b), the tension on the wire 6 that was adjusting the floating position of the float 5 is released, and the buoyancy of the float 5 acts on it, causing it to float up and come into contact with the float contact part 9, thereby floating the structure main body 2.

[0038] In Fig. 1, the earthquake sensor 12 is installed on the foundation body 4, but the earthquake sensor 12 may be installed anywhere as long as it can detect earthquakes acting on the structure body 1. The float contact part 9 also serves to prevent the float 5 from floating above the water surface and being carried away.

[0039] FIG. 2 is a plan view showing a portion where a float 5 is provided on a structure body 2 in a floating insulated structure 1 according to the present invention. As an example, the building is assumed to be a steel-framed structure with three aboveground floors and one underground floor, and its main use is a store. The distance between the columns is 7 to 7.2 m, and the cross section of the structure body is 49 m x 14.4 m. The horizontal distance from the structure body to the water tank body 3 is about 4.3 m. The structure body 2 is installed inside the water tank body 3, and the float 5 is provided so as to surround the structure body 2. The amount of the float 5 may be an amount that allows buoyancy to act on the structure body 2, and the portion where the float 5 is attached may be anywhere as long as buoyancy acts on the structure body 2.

[0040] FIG. 3 is a cross-sectional view of one embodiment of the floating insulated structure 1 according to the present invention. As an example, a structure body 2 is built on a foundation framework 4 and has one basement floor and three aboveground floors, with each floor having a width of 14.4 m and a height of about 2.75 to 3.9 m, and is installed in a water tank framework 3 having a thickness of 80 to 90 cm. The foundation framework 4 is set to have a width of 14.4 m and a height of 2.1 m. It is divided into four spaces, two of which are used as air tanks 10, and the other two contain load adjustment water 11 to adjust the self-weight of the structure body 2. In addition, an earthquake sensor 12 is installed on the first basement floor.

[0041] A float contact part 9 extends horizontally on the side of the structure body 2, and a winch 7 is attached to the bottom of the float contact part 9. A wire 6 connecting the float 5 and the structure body 2 runs from the winch 7 of the float contact part 9 through a pulley 8 installed on the bottom of the water tank body 3 and is connected to the float 5.

[0042] FIG. 3(a) shows the normal state of the floating insulated structure 1. Under normal circumstances, the wire 6 is tensioned by a winch 7 to fix the float 5 at a predetermined floating height, thereby reducing the buoyancy added by the float 5. Alternatively, the buoyancy added by the float 5 can be set to zero. In addition, load adjustment water 11 is placed in two spaces provided in the foundation body 4. By making the sum of the buoyancy of the structure body 2 itself and the buoyancy added by the float 5 smaller than the weight of the structure body 2, the structure body 2 is grounded to the bottom of the water tank body 3, and is in a stable state that is not subject to vibration due to wind pressure or the like.

[0043] Figure 3(b) shows the state of the floating insulated structure 1 during an earthquake. When an earthquake is detected by the earthquake sensor 12 installed inside the structure body 2, the winch 7 is activated and the tension acting on the wire 6 is released, causing the wire 6 to be pulled out and lengthened. The float 5 then floats up and comes into contact with the float contact part 9, adding to the buoyancy acting on the float 5, causing the structure body 2 to float slightly and become insulated from the ground. The total buoyancy at this time is greater than the weight of the structure body 2.

[0044] Figure 3(c) shows the state of the floating insulated structure 1 during a flood. When the water level rises suddenly during a flood or other disaster, it is necessary to float the main structure 2 to an appropriate height corresponding to the water level. By operating the winch 7, the tension of the wire 6 connecting the float 5 is adjusted, and the wire 6 is pulled out and lengthened. When the floated float 5 comes into contact with the float contact part 9, the buoyancy acting on the float 5 is added, and the main structure 2 is floated to an appropriate height as shown in Figure 3(c), isolating it from the ground.

[0045] In addition, for example, by providing a mooring device that connects the main structure 2 to the ground and preventing it from being washed away, the building can maintain its functionality without being damaged by flooding. For example, it can be used as a disaster prevention base for the region.

[0046] 4 is a schematic diagram showing the restoring force of the floating body 5 in the floating insulated structure 1 according to the present invention. In (a), tension is applied to the wire 6 by the winch 7, the length of the wire 6 is fixed at a predetermined floating height, and the structure body 2 is in a stable stationary state.

[0047] Figure 4(b) shows the case where the main structure 2 tilts due to external forces such as wind pressure when floating up. When tilting occurs, the float 5 on the floating side is pulled down and separated from the main structure 2, reducing buoyancy and generating a downward force on the winch 7. On the sinking side, the buoyancy is pushed down and increases as more of it is submerged in water. As the buoyancy of the float changes as shown in the figure, a restoring force is generated without actively controlling the winch 7, and stability can be expected even when floating up.

[0048] 5 shows one embodiment of the structure of a float 5 used in a floating insulated structure 1 according to the present invention. For example, the float 5 is composed of a steel frame 13 and a tank 14 filled with air. By surrounding the tank 14 with the outer shell of the steel frame 13, the tank 14 can be protected and its durability can be maintained. The float 5 of one unit shown here is assumed to be 3.0 m long x 4, 3.0 m high, and 0.6 m wide.

[0049] Under normal circumstances, the float 5 is pulled down into the water by the wire 6, and the buoyancy of the float 5 is balanced with the tensile force of the wire 6. When the float is raised and stable during an earthquake, it comes into contact with the float contact part 9 provided on the structure body 2, and floats by adding buoyancy to the structure body 2. At this time, the buoyancy of the float 5 and the reaction force acting on the float contact part 9 are balanced.

[0050] The cross section of the steel members that form the steel frame 13 is determined from the axial forces acting on them under normal conditions and when the float is stable. For the dimensions in Fig. 5, if the steel members are channel steel members with a height of 100 mm, width of 50 mm, web thickness of 5 mm and flange thickness of 7.5 mm, the ratio of the steel weight to the buoyancy is about 5%, and it is believed that the buoyancy of the float can be effectively utilized.

[0051] FIG. 6 is an idea diagram showing an example in which the floating insulated structure 1 according to the present invention is used in a canal. For example, Osaka is known as the water city, and is blessed with seas and rivers (canals). However, with the development of transportation, the use of canals has drastically decreased, and they are being filled in. However, filling in the canals requires time and money, so instead of filling them in, it would be possible to develop the canals, build a water tank framework, and install the structure body inside it, thereby making effective use of existing rivers and canals that are no longer in use. For example, it is thought that they could be used for commercial facilities such as shops.

[0052] 7 and 8 are conceptual diagrams showing a method of constructing the floating insulated structure 1 according to the present invention in an existing river. (1) The river will be diverted using temporary waterways, etc., just before the location where the tank structure will be constructed, which is indicated as the target area. (2) First, block the water flowing into the target area using sandbags or embankments. (3) On the river side, steel pipe sheet piles are installed using barges or other equipment, and the construction yard is enclosed. (4) Improve the ground on the river side to prevent groundwater from flowing into the construction yard. (5) Drainage, sludge dredging, and excavation will be carried out at the construction yard. (6) Improve the shallow layer of the ground. If the bearing layer is deep, construct pile foundations. (7) Construct the tank structure. (8) Construct the main structure (floating building). [Explanation of symbols]

[0053] 1...Floating insulation structure 2…Main body of structure 3…Aquarium structure 4…Fundamental framework 5…Floating body 6…Wire 7…Winch 8...Pulley 9…Floating body contact part 10…Air tank 11...Load adjustment water 12…Earthquake sensor 13...Steel frame 14. Tank 15…Wire attachment part 16…Floating body contact point

Claims

1. A floating insulation structure in which a structure body is installed inside a water tank body and the structure body is floated by utilizing the buoyancy of the water inside the water tank body to be insulated from the ground, The floating insulating structure is a float installed on an outer periphery of the structure body for floating the structure body; A buoyancy adjustment means for applying a tension force in a direction opposite to the buoyancy acting on the float; Equipped with In normal times, the buoyancy adjusting means pulls down the float, thereby reducing the buoyancy acting on the structure body and grounding the structure body within the water tank framework. In the event of an earthquake or flood, the tension applied to the float by the buoyancy adjustment means is relaxed so that the structure body floats up. A floating insulating structure.

2. 2. The floating insulating structure according to claim 1, The buoyancy adjustment means is A wire member connected to the floating body; a winch for adjusting a winding length of the wire member to introduce and release tension; A floating insulation structure comprising:

3. 3. The floating insulating structure according to claim 2, The floating body is composed of a structure separated from a structure body, In a state where tension is applied to the wire member by the winch, the wire member is substantially separated from the structure body, A floating insulated structure characterized in that by unwinding the wire member with the winch and releasing the tension, it comes into contact with a float contact portion formed on the outer periphery of the structure main body, and the buoyancy acting on the float is applied to the structure main body.

4. 2. The floating insulating structure according to claim 1, The floating body includes a steel frame that constitutes an outer shell of the floating body, a tank provided inside the steel frame and filled with air; A floating insulation structure comprising:

5. 2. The floating insulating structure according to claim 1, A space for storing load-adjusting water for adjusting the weight of the structure body is provided in the foundation frame provided under the structure body. A floating insulating structure.

6. 2. The floating insulating structure according to claim 1, The structure body is provided with an earthquake sensor that detects earthquakes. A floating insulating structure.

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