Underground heat utilization system in base isolation building

Abstract

To enhance heat collection efficiency of underground heat by increasing the amount of outside air for exchanging heat with a lower skeleton where the underground heat is accumulated, in a process where the outside air flows in an outside air introduction path in a base isolation pit.SOLUTION: An underground heat utilization system in a base isolation building includes: an outside air take-in part 5 for taking in outside air OA to a base isolation pit 4 between an upper skeleton 3 and a lower skeleton 1; an outside air introduction path 6 for circulating the outside air OA taken in from the outside air take-in part 5 in the base isolation pit 4 in a state of exchanging heat with the lower skeleton 1; and an outside air supply part 7 for supplying the outside air OA which has circulated in the outside air introduction path 6 to the upper skeleton 3 side. In the outside air introduction path 6, pit inside lower region guide means 9 is provided for guiding the flow of the outside air OA in a lower region 4B by shielding an upper region 4A and opening the lower region 4B in the vertical direction of the base isolation pit 4.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a geothermal energy utilization system, and more particularly to a geothermal energy utilization system in a seismically isolated building in which an upper frame is supported by a lower frame in contact with the ground via seismic isolation bearings. [Background technology]

[0002] A geothermal energy utilization system is known that reduces the outside air load on a building by creating an outside air intake path in an underground pit or the like of a building, and cooling or heating the outside air using geothermal heat, which changes little in temperature throughout the year as the outside air flows through the outside air intake path, before supplying it to the building. In seismically isolated buildings, in which the upper structure is supported by the lower structure in contact with the ground via seismic isolation bearings, an outside air introduction path is formed in the seismic isolation pit between the upper structure and the lower structure (see Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6434342 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-56885 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the height of the seismic isolation pits in seismically isolated buildings tends to be large because seismic isolation bearings such as laminated rubber bearings are installed and sturdy seismic isolation upper and lower foundations are constructed directly above and below the seismic isolation bearings. As a result, as the outside air flows through the outside air intake path, the amount of outside air that exchanges heat with the lower structure where geothermal heat is stored is relatively small, resulting in a problem of low geothermal heat extraction efficiency.

[0005] In view of this situation, the main objective of the present invention is to provide a geothermal energy utilization system for a seismically isolated building that can increase the efficiency of geothermal heat extraction by increasing the amount of outside air that exchanges heat with the lower structure in which geothermal heat is stored as the outside air flows through the outside air inlet path in the seismic isolation pit. [Means for solving the problem]

[0006] The first characteristic configuration of the present invention is a seismically isolated building in which an upper frame is supported by a lower frame in contact with the ground via seismic isolation bearings, an outside air intake section that takes in outside air into the seismic isolation pit between the upper structure and the lower structure; an outside air introduction path that circulates the outside air taken in from the outside air intake section through the seismic isolation pit while exchanging heat with the lower structure; A geothermal energy utilization system in a seismically isolated building, comprising: an outside air supply unit that supplies the outside air that has circulated through the outside air introduction path to the upper structure side; The outside air introduction path is equipped with a lower area guide means within the pit that blocks the upper area and opens the lower area in the vertical direction of the seismic isolation pit, guiding the flow of outside air to the lower area.

[0007] According to this configuration, the flow of outside air in the outside air intake path is guided to the lower area by the lower area guide means within the pit, which protrudes downward from the bottom of the upper body and blocks the upper area.As a result, the amount of outside air that exchanges heat with the lower body in which geothermal heat is stored can be increased, thereby improving the efficiency of geothermal heat extraction.

[0008] The second characteristic configuration of the present invention is that the lower area guide means within the pit is composed of a hanging curtain hanging down from the upper body with a gap corresponding to the lower area between it and the lower body.

[0009] According to this configuration, the lower area guide means within the pit is composed of a hanging curtain, so the seismic isolation effect of the seismic isolation bearing does not hinder the relative horizontal movement of the upper and lower structures, and even if the seismic isolation effect causes the upper and lower structures to move horizontally relative to each other, the hanging curtain is unlikely to be damaged, making it possible to make the lower area guide means within the pit suitable for seismically isolated buildings.

[0010] A third characteristic configuration of the present invention is provided with a detouring means for regulating the direction of flow of outside air in the seismic isolation pit, thereby detouring the outside air introduction path from the outside air intake section to the straight flow path leading to the outside air supply section, The detouring means is configured by a hanging curtain that hangs down from the upper body and spans the upper and lower bodies.

[0011] According to this configuration, the detour means diverts the outside air introduction path from the outside air intake section to the straight flow path leading to the outside air supply section, thereby increasing the area of ​​the lower structure that exchanges heat with the outside air flowing through the outside air introduction path, thereby further improving the efficiency of extracting geothermal heat. Moreover, since the detour means is made up of a hanging curtain, the seismic isolation effect of the seismic isolation bearings does not hinder the relative horizontal movement of the upper and lower frames, and the hanging curtain is unlikely to be damaged even if the upper and lower frames move horizontally relative to each other due to the seismic isolation effect, making it a detour means suitable for seismically isolated buildings.

[0012] A fourth characteristic feature of the present invention is that a curtain is provided at the outer periphery of the seismic isolation pit, hanging down from the upper structure so as to leave a gap between the upper structure and the lower structure to form the outside air intake section.

[0013] With this configuration, the seismic isolation effect of the seismic isolation bearings does not hinder the relative horizontal movement of the upper and lower structures, and an outside air intake section can be formed on the outer periphery of the seismic isolation pit using a curtain that is less likely to be damaged even if the upper and lower structures move horizontally relative to each other due to the seismic isolation effect.

[0014] A fifth characteristic feature of the present invention is that the upper edge of the curtain is attached to the side of the seismic isolation upper foundation that protrudes from the underside of the upper frame.

[0015] With this configuration, the approximately vertical side portion of the seismic isolation upper foundation that protrudes from the underside of the upper structure can be used to relatively easily attach a curtain that hangs downward in approximately the same posture as the side portion to the upper structure. [Brief explanation of the drawings]

[0016] [Figure 1] Side cross-sectional view showing the schematic configuration of the geothermal energy utilization system [Figure 2] FIG. 2(A) is a cross-sectional view showing a pit lower area guide means, and FIG. 2(B) is a cross-sectional view showing a pit lower area guide means. [Figure 3] Horizontal cross section of the seismic isolation pit showing the planar layout of the outside air intake route DETAILED DESCRIPTION OF THE INVENTION

[0017] An embodiment of a geothermal heat utilization system for a seismically isolated building according to the present invention will be described with reference to the drawings. As shown in Figure 1, in a seismically isolated building, an upper frame 3 is supported by a lower frame 1 that is in contact with the ground G via seismic isolation bearings 2. In the example shown in Figure 1, the lower frame 1 is configured as a foundation frame made of reinforced concrete, and the upper frame 3 is configured as a building frame made of reinforced concrete. A seismic isolation pit 4 is formed between the lower frame 1 and the upper frame 3, in which the seismic isolation bearings 2 are installed. The seismic isolation bearings 2 are configured, for example, from laminated rubber bearings or the like.

[0018] As shown in Figures 1 and 2, the upper body 3 is constructed, for example, as a rigid frame structure in which columns 3A are arranged at a predetermined interval along two directions that are perpendicular to each other in a plan view, and beams (not shown) are erected between adjacent columns 3A. A flat columnar seismic isolation upper foundation footing 3D (an example of a seismic isolation upper foundation) is formed to protrude from the bottom of this upper structure 3 directly below each column 3A and placed on the upper surface of the seismic isolation bearing 2. In addition, a seismic isolation upper foundation beam 3E (an example of a seismic isolation upper foundation, an example of a beam) is provided across adjacent seismic isolation upper foundation footings 3D, and a floor slab 3B of the lowest floor of the upper structure 3 is provided above the seismic isolation upper foundation beam 3E.

[0019] 1, the lower structure 1 is provided with, for example, a foundation slab 1A that covers almost the entire area in a plan view, and a seismic isolation retaining wall 1B that supports the ground behind the outer periphery of the foundation slab 1A. Directly below each column 3A at the top of the foundation slab 1A of this lower structure 1, a flat columnar seismic isolation lower foundation footing 1D (an example of a seismic isolation lower foundation) on which a seismic isolation bearing 2 is placed is protruded.

[0020] As shown in Fig. 1, the geothermal energy utilization system includes an outside air intake section 5 that takes in outside air into the seismic isolation pit 4, an outside air introduction path 6 that circulates the outside air taken in from the outside air intake section 5 in a substantially horizontal direction through the seismic isolation pit 4 while exchanging heat with the lower structure 1, and an outside air supply section 7 that supplies the outside air that has circulated through the outside air introduction path 6 to the upper structure 3. In Fig. 1, the flow of the outside air is indicated by solid arrows.

[0021] 1 shows an example in which the outside air intake section 5 and the outside air supply section 7 are separately arranged at one end (the left end side in the figure) and the other end (the right end side in the figure) of the seismically isolated building. Outside air OA is taken into the internal space of the seismic isolation pit 4 from the outside air intake section 5 at one end of the seismically isolated building, and circulated along the outside air introduction path 6 to the other end of the seismically isolated building in a state where it exchanges heat with the lower structure 1. After that, the outside air OA that has exchanged heat with the lower structure 1 is supplied to the upper structure 3 from the outside air supply section 7 at the other end.

[0022] The outside air supply unit 7 is formed, for example, by penetrating the floor slab 3B at the bottom of the upper structure 3, and is composed of a communication port or the like that connects the internal space of the seismic isolation pit 4 with the internal space of the upper structure 3 (for example, a machine room) in a substantially vertical direction. An outside air supply device 8, such as an outside air processing air conditioner having a fan (not shown), is installed in the internal space of the upper structure 3. The outside air supply device 8 is configured to draw outside air OA from the internal space of the seismic isolation pit 4 through the outside air supply unit 7 by operating the fan, and to supply the drawn outside air OA to an appropriate location in the internal space of the upper structure 3 through a duct or the like.

[0023] As shown in Figure 1, the outside air introduction path 6 of this geothermal energy utilization system is equipped with a lower area guide means 9 within the pit that blocks the upper area 4A and opens the lower area 4B in the vertical direction of the seismic isolation pit 4 formed between the foundation slab 1A and the floor slab 3B of the lowest floor, thereby guiding the flow of outside air OA to the lower area 4B. 1 and 2(A), this lower area guide means 9 in the pit is composed of a flexible hanging curtain 9A hanging down from the upper structure 3. This hanging curtain 9A is arranged with a gap corresponding to the lower area 4B between it and the upper surface of the foundation slab 1A of the lower structure 1, and obstructs the flow of outside air OA in the blocked (existing) upper area 4A, while allowing the flow of outside air OA in the lower area 4B, guiding the flow of outside air OA in the outside air introduction path 6 to the lower area 4B. This makes it possible to increase the amount of outside air OA that exchanges heat with the lower structure 1 in which geothermal heat is stored, thereby improving the efficiency of geothermal heat extraction.

[0024] In the example shown in Figure 1, the bottom level of the curtain 9A is set below the bottom level of the seismic isolation upper foundation footing 3D of the upper structure 3 and at the same level as the top level of the seismic isolation lower foundation footing 1D of the lower structure 1. This allows more than half of the upper side of the seismic isolation pit 4 in the vertical direction to be blocked by the curtain 9A, allowing the outside air OA to flow in a concentrated manner so that it comes into contact with the foundation slab 1A and the seismic isolation lower foundation footing 1D, where geothermal heat is easily transferred. This allows geothermal heat to be efficiently extracted. Furthermore, by simply setting the flow area of ​​the outside air OA, the desired amount of outside air OA can be ensured. In addition, by setting the bottom end level of the hanging curtain 9A below or above the top end level of the seismic isolation lower foundation footing 1D, the area through which the outside air OA flows can be made smaller or larger.

[0025] As shown in FIG. 2(A), the upper edge of the curtain 9A is attached by curtain attachment means M to the side of the seismic isolation upper foundation beam 3E that protrudes from the underside of the floor slab 3B of the lowest floor of the upper structure 3. The curtain attachment means M can be configured, for example, from a rail-shaped hooked member that extends substantially horizontally and can hang and support the curtain 9A by hooking the upper edge of the curtain 9A. The hooked member is fixed to the side surface of the seismic isolation upper foundation beam 3E with concrete screws, adhesive, etc., and the upper edge of the curtain 9A is hung and supported by the fixed hooked member, so that the upper edge of the curtain 9A can be attached to the side surface of the seismic isolation upper foundation beam 3E.

[0026] 1 and 2(B), a partitioning means 10 is provided that partitions the outside air introduction path 6 by restricting the flow direction of outside air OA in the seismic isolation pit 4. As will be described in detail later, this partitioning means 10 also constitutes a detouring means 11 that detours the outside air introduction path 6 away from the straight flow path from the outside air intake section 5 to the outside air supply section 7. This partitioning means 10 is constituted by a flexible, non-breathable curtain 10A that hangs down from the upper structure 3 and the lower structure 1 in a state that spans both the upper structure 3 and the lower structure 1 (without leaving a gap between the upper structure 3 and the lower structure 1).

[0027] As shown in FIG. 2(B), the upper edge of this curtain 10A, like curtain 9A, is attached to the side of the seismic isolation upper foundation beam 3E using curtain attachment means M. As shown in FIG. 1, in this embodiment, curtain 10A is attached to the outdoor side of the seismic isolation upper foundation beam 3E at the outer periphery of the seismic isolation pit 4. Therefore, unlike when curtain 10A is attached to the indoor side of the seismic isolation upper foundation beam 3E at the outer periphery of the seismic isolation pit 4, curtain 10A is not divided by the orthogonal seismic isolation upper foundation beam 3E, and can be efficiently attached using a curtain 10A that is long in the width direction. The curtain 10A is not limited to being attached to the outer periphery of the seismic isolation pit 4, but can also be attached to any suitable location within the seismic isolation pit 4 where it is desired to restrict the flow direction of outside air OA, such as inside the seismic isolation pit 4, as shown in FIG. 3 (described later).

[0028] As shown in Figure 1, the outside air intake section 5 is made up of communication ports and the like that connect the internal space of the seismic isolation pit 4 with the outdoor space in a substantially horizontal direction on the outer periphery of the seismic isolation pit 4. A flexible, non-breathable curtain 12A is provided on the outer periphery of the seismic isolation pit 4, hanging down from the upper body 3 with a gap that forms the outside air intake section 5 between it and the top surface of the foundation slab 1A of the lower body 1, and the outside air intake section 5 is formed by this curtain 12A.

[0029] Like the curtains 9A and 10A, the upper edge of the curtain 12A is attached using curtain attachment means M to the side of the seismic isolation upper foundation beam 3E that protrudes from the underside of the upper body 3. In this embodiment, the curtain 12A is attached to the outdoor side of the seismic isolation upper foundation beam 3E on the outer periphery of the seismic isolation pit 4, and is not divided by the orthogonal seismic isolation upper foundation beam 3E, allowing for efficient attachment using the curtain 12A that is long in the width direction.

[0030] In the example shown in Figure 1, the bottom level of the curtain 12A is set below the bottom level of the seismic isolation upper foundation footing 3D of the upper body 3 and equal to the top level of the seismic isolation lower foundation footing 1D of the lower body 1, and the area below this is used as the outside air intake section 5, but by setting the bottom level of the curtain 12A below or above the top level of the seismic isolation lower foundation footing 1D, the outside air intake section 5 can be made smaller or larger.

[0031] Furthermore, by supporting the upper edges of the curtains 9A, 10A, and 12A on a rail-shaped member to be hung, and supporting the curtains so that they can move along the direction of the rail-shaped member, the curtains 9A, 10A, and 12A can be opened and closed freely. In this way, the curtains 9A, 10A, and 12A can be opened to allow people to pass through, facilitating maintenance work, evacuation, firefighting activities, and the like.

[0032] Next, an example of the planar arrangement of the outside air introduction path 6 will be explained with reference to Fig. 3. In Fig. 3, the curtains that do not restrict the flow of outside air OA (the curtain 12A that forms the outside air intake section 5 and the curtain 9A that constitutes the pit lower area guide means 9) are shown with thick dashed dotted lines, and the curtains that restrict the flow of outside air OA (the curtain 10A that constitutes the partition means 10 and the detouring means 11) are shown with thick solid lines. The outside air introduction path 6 is also shown with a thick solid arrow.

[0033] In the example shown in Figure 3, outside air intake sections 5 are provided in multiple locations (specifically, two locations), and multiple outside air introduction paths 6 are provided from the multiple outside air intake sections 5 to the outside air supply section 7. In this embodiment, the multiple outside air intake sections 5 are provided on the same outer side (the left side in the figure) of the four outer sides of the seismic isolation pit 4, which is rectangular in plan view, but they may also be provided distributed on different outer sides.

[0034] Each outside air introduction path 6 is configured as a detour flow path that detours from the straight flow path from each outside air intake section 5 to the outside air supply section 7, as the flow direction of the outside air OA is regulated by a hanging curtain 10A (see Figure 2 (B)) that constitutes the detour means 11. In the planar arrangement example shown in Fig. 3, each outside air introduction path 6 is configured as a return bypass flow path that extends from one end side (left end side in the figure) to the other end side (right end side in the figure) along the X direction (left-right direction in the figure) of the seismic isolation pit 4, extends along the Y direction (up-down direction in the figure) perpendicular to the X direction, and then extends from the other end side (right end side in the figure) to one end side (left end side in the figure) along the X direction. Note that the planar arrangement example shown in Fig. 3 is merely an example, and the type of bypass flow path that the outside air introduction path 6 is configured as can be changed as appropriate depending on the relative positions of the outside air intake unit 5 and the outside air supply unit 7, the surrounding environment of the seismic isolated building, etc.

[0035] In this way, the outdoor air introduction path 6 is diverted by the hanging curtain 10A constituting the detouring means 11, so that the area of ​​the lower structure 1 that exchanges heat with the outdoor air OA flowing through the outdoor air introduction path 6 can be increased, and the efficiency of extracting geothermal heat can be further improved. The curtains 9A, 10A, and 12A may be of a lift-up type, such as a roller blind, so that the lower end level of each of the curtains 9A, 10A, and 12A can be changed. In this way, the planar arrangement of the outside air introduction path 6 can be changed by changing the lower end level of each of the curtains 9A, 10A, and 12A in accordance with, for example, changes in the seasons, changes in the surrounding environment, or changes in the use of the interior space of the upper structure 3, thereby changing the location where outside air OA is taken in (outside air intake section 5), the location where the flow of outside air OA is permitted, and the location where the flow of outside air OA is restricted.

[0036] [Another embodiment] Other embodiments of the present invention will be described below. Note that the configurations of the embodiments described below are not limited to being applied independently, but can also be applied in combination with the configurations of other embodiments.

[0037] (1) In the above embodiment, a case where a plurality of outside air intake sections 5 and outside air introduction paths 6 are provided is exemplified, but only one may be provided. Also, in the above embodiment, a case where only one outside air supply section 7 is provided is exemplified, but multiple outside air supply sections 7 may be provided.

[0038] (2) In the above embodiment, the pit lower area guide means 9 is configured by a hanging curtain 9A, but it may be configured by other members such as a plate material, a wall, etc. Furthermore, the partition means 10 and the detouring means 11 may also be configured by members other than the hanging curtain 10A shown in the above embodiment.

[0039] (3) In the above embodiment, an example is shown in which the outside air intake section 5 is formed by a hanging curtain 12A hanging from the upper structure 3 at the outer periphery of the seismic isolation pit 4, but the outside air intake section 5 may also be formed by other members such as boards or walls hanging from the upper structure 3.

[0040] (4) In the above embodiment, the upper edges of the curtains 9A, 10A, and 12A are attached to the side of the seismic isolation upper foundation beam 3E, but they may also be attached to the side of the seismic isolation upper foundation footing 3D or the underside of the upper body 3 (the underside of the floor slab 3B of the lowest floor).

[0041] (5) The curtain mounting means M is not limited to the rail-shaped hanging member shown in the above embodiment, but various means can be used to mount the curtains 9A, 10A, 12A to the upper body 3, such as concrete screws or adhesives. [Explanation of symbols]

[0042] 1 Lower structure 2. Seismic isolation bearings 3 Upper frame 3D seismic isolation upper foundation footing (seismic isolation upper foundation) 3E Seismic isolation upper foundation beam (seismic isolation upper foundation) 4. Seismic isolation pit 4A Upper Area 4B Lower Area 5. Fresh air intake 6. Outside air intake route 7. Outside air supply section 9. Pit lower area guide means 9A Banner 10A Banner 11 Detours 12A Banner G Ground OA Outside air

Claims

1. In a seismically isolated building, the upper structure is supported by the lower structure that is in contact with the ground via seismic isolation bearings. An outside air intake section that takes in outside air into the seismic isolation pit between the upper structure and the lower structure; an outside air introduction path that circulates the outside air taken in from the outside air intake section through the seismic isolation pit in a state in which the outside air is heat exchanged with the lower structure; A geothermal energy utilization system in a seismically isolated building, comprising: an outside air supply unit that supplies the outside air that has flowed through the outside air introduction path to the upper structure side; A geothermal energy utilization system in a seismically isolated building, in which the outside air introduction path is equipped with a lower area guide means within the pit that blocks the upper area and opens the lower area in the vertical direction of the seismic isolation pit, thereby guiding the flow of outside air to the lower area.

2. A geothermal energy utilization system in a seismically isolated building as described in claim 1, wherein the lower area guide means in the pit is constituted by a curtain hanging down from the upper structure leaving a gap corresponding to the lower area between the curtain and the lower structure.

3. A detouring means is provided for regulating the direction in which the outside air flows in the seismic isolation pit, thereby detouring the outside air introduction path from the outside air intake section to the straight flow path leading to the outside air supply section, 2. A geothermal energy utilization system in a seismically isolated building according to claim 1, wherein the bypass means is constituted by a curtain hanging down from the upper structure in a state spanning the upper structure and the lower structure.

4. A geothermal energy utilization system in a seismically isolated building as described in claim 1, wherein a curtain is provided hanging down from the upper structure at the outer periphery of the seismic isolation pit, leaving a gap between the upper structure and the lower structure to form the outside air intake section.

5. A geothermal energy utilization system in a seismically isolated building as described in any one of claims 1 to 3, wherein the upper edge of the curtain is attached to the side portion of the seismically isolated upper foundation protruding from the underside of the upper structure.

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