JP7501337B2 - Dismantling tools and dismantling tool sets - Google Patents

Description

The present invention relates to demolition tools and demolition tool sets used when demolishing seismically isolated buildings.

Seismically isolated buildings are known that are equipped with seismic isolation devices that support the building body so as to isolate it from the ground, making it difficult for ground vibrations caused by earthquakes to be transmitted to the building body. Seismic isolation devices used in such seismically isolated buildings are disclosed in, for example, Patent Documents 1 to 6.

Seismic isolation devices absorb the vibration energy of the ground and change the shaking of the building itself into gentle lateral shaking, preventing the collapse and damage of the building, as well as preventing furniture and other items inside the building from falling over.

Japanese Patent Application Laid-Open No. 9-189143 JP 2001-55842 A JP 2007-277810 A Patent No. 5339521 Patent No. 6567207 Japanese Patent Publication No. 7-35700

During demolition work to demolish a seismically isolated building, heavy machinery is used to apply excessive loads to the building body, and work is carried out on the building body, such as cutting it or breaking it by pulling or pushing it in. If excessive loads are applied to the building body during this type of demolition work, there is a risk that the building body supported by the seismic isolation device will experience unexpected lateral shaking. In this case, there is a risk that unexpected parts of the building body will collapse, which could reduce the safety of the demolition work.

The present invention was made in consideration of these circumstances, and its purpose is to provide demolition tools and a demolition tool set that can ensure the safety of demolition work when demolishing seismically isolated buildings.

A demolition tool according to one aspect of the present invention is a tool used when demolishing a seismically isolated building having a seismic isolation device arranged in an area surrounded by a perimeter foundation formed on the ground, a seismic isolation foundation beam connected to the seismic isolation device, a perimeter foundation beam arranged facing the upper side of the perimeter foundation in the vertical direction, and a building body supported from below by the seismic isolation foundation beam and the perimeter foundation beam. This demolition tool includes an insertion part that is inserted into the gap between the perimeter foundation and the perimeter foundation beam in an insertion direction along the thickness of the perimeter foundation and placed on the upper surface of the perimeter foundation, a first foundation facing part that extends from one end of the insertion part and faces the side surface of the perimeter foundation, and a first beam facing part that extends from the other end of the insertion part in the opposite direction to the first foundation facing part and faces the side surface of the perimeter foundation beam. When the first foundation facing portion is in contact with the side of the outer perimeter foundation and the first beam facing portion is in contact with the side of the outer perimeter foundation beam, the horizontal displacement of the outer perimeter foundation beam relative to the outer perimeter foundation is restricted.

With this demolition tool, when the insertion portion is inserted into the gap between the outer periphery foundation and the outer periphery foundation beam and placed on the upper surface of the outer periphery foundation, the first foundation facing portion faces the side surface of the outer periphery foundation, and the first beam facing portion faces the side surface of the outer periphery foundation beam. In this configuration, when the first foundation facing portion is in contact with the side surface of the outer periphery foundation and the first beam facing portion is in contact with the side surface of the outer periphery foundation beam, the horizontal displacement of the outer periphery foundation beam relative to the outer periphery foundation can be restricted. By restricting the displacement of the outer periphery foundation beam, the horizontal displacement of the building body supported by the outer periphery foundation beam and the seismic isolation foundation beam is also restricted. As a result, in the demolition work to demolish a seismic isolation building, it is possible to suppress unexpected lateral shaking of the building body supported by the seismic isolation foundation beam connected to the seismic isolation device. Therefore, it is possible to prevent the collapse of unexpected parts of the building body during the demolition work, and it is possible to ensure the safety of the demolition work.

The above demolition tool further includes a second foundation facing portion that extends from the other end of the insertion portion in the same direction as the first foundation facing portion and faces the side surface of the outer perimeter foundation, and a second beam facing portion that extends from one end of the insertion portion in the same direction as the first beam facing portion and faces the side surface of the outer perimeter foundation beam. When the second foundation facing portion is in contact with the side surface of the outer perimeter foundation and the second beam facing portion is in contact with the side surface of the outer perimeter foundation beam, the tool restricts horizontal displacement of the outer perimeter foundation beam relative to the outer perimeter foundation.

In this embodiment, when the insertion portion is inserted into the gap between the outer periphery foundation and the outer periphery foundation beam and placed on the upper surface of the outer periphery foundation, the first foundation facing portion and the second foundation facing portion face both sides of the outer periphery foundation so as to sandwich the outer periphery foundation, and the first beam facing portion and the second beam facing portion face both sides of the outer periphery foundation beam. In this configuration, in addition to the state in which the first foundation facing portion contacts the side of the outer periphery foundation and the first beam facing portion contacts the side of the outer periphery foundation beam, the horizontal displacement of the outer periphery foundation beam relative to the outer periphery foundation can be restricted even in the state in which the second foundation facing portion contacts the side of the outer periphery foundation and the second beam facing portion contacts the side of the outer periphery foundation beam. This makes it possible to more reliably suppress unexpected lateral shaking of the building body supported by the seismic isolation beam connected to the seismic isolation device during demolition work to dismantle a seismic isolated building.

In the above demolition tool, the first foundation facing portion and the second beam facing portion are integrally formed and connected and fixed to one end of the insertion portion, and the second foundation facing portion and the first beam facing portion are integrally formed and connected and fixed to the other end of the insertion portion.

In this embodiment, the demolition tool can be realized with a simple structure in which the integrated part of the first foundation facing part and the second beam facing part is connected and fixed to one end of the insertion part, and the integrated part of the second foundation facing part and the first beam facing part is connected and fixed to the other end of the insertion part.

In the above demolition tool, the distance between the first foundation facing portion and the first beam facing portion along the insertion direction is set so as to satisfy the following formula (1).
{(D−T1)+(D−T2)}<A...(1)

In formula (1), "D" indicates the distance in the insertion direction between the first foundation facing part and the first beam facing part, "T1" indicates the thickness of the outer perimeter foundation, "T2" indicates the thickness in the insertion direction of the outer perimeter foundation beam, and "A" indicates the horizontal movement allowance of the building body due to the seismic isolation device.

In this embodiment, the distance between the first foundation facing portion and the first beam facing portion along the insertion direction is set based on the horizontal movement allowance of the building body due to the seismic isolation device. As a result, if the outer perimeter foundation beam attempts to displace relative to the outer perimeter foundation beyond the movement allowance of the seismic isolation device, the first foundation facing portion will reliably contact the side of the outer perimeter foundation and the first beam facing portion will reliably contact the side of the outer perimeter foundation beam. Therefore, the horizontal displacement of the outer perimeter foundation beam relative to the outer perimeter foundation can be made smaller than the movement allowance of the seismic isolation device.

In the above demolition tool, the insertion portion and the opposing portion of the first foundation opposing portion and the first beam opposing portion that is positioned on the inside of the outer perimeter foundation have a width dimension that is shorter than the dimension of the gap between the outer perimeter foundation and the outer perimeter foundation beam in the vertical direction and in a direction perpendicular to the insertion direction.

In this aspect, when the demolition tool is placed in the gap between the outer periphery foundation and the outer periphery foundation beam so that the insertion portion is placed on the upper surface of the outer periphery foundation, the insertion portion and the opposing portion of the first foundation facing portion and the first beam facing portion that is located on the inside of the outer periphery foundation can pass through the gap from the outside to the inside of the outer periphery foundation and the outer periphery foundation beam. Then, by rotating the demolition tool 90 degrees with the insertion portion located in the gap and the opposing portion of the first foundation facing portion and the first beam facing portion that is located on the inside of the outer periphery foundation being located on the inside of the outer periphery foundation, the demolition tool can be placed in the gap so that the first foundation facing portion faces the side of the outer periphery foundation and the first beam facing portion faces the side of the outer periphery foundation beam.

In the above demolition tool, the insertion portion is configured with a mounting portion having a surface extending parallel to the upper surface of the outer perimeter foundation when the first foundation facing portion faces the side surface of the outer perimeter foundation and the first beam facing portion faces the side surface of the outer perimeter foundation beam.

In this embodiment, the insertion portion is configured with a mounting portion having a surface that extends parallel to the upper surface of the outer perimeter foundation, making it possible to maintain a stable mounting state on the upper surface of the outer perimeter foundation. As a result, when the insertion portion is placed on the upper surface of the outer perimeter foundation, the demolition tool can stably maintain an attitude in which the first foundation facing portion faces the side surface of the outer perimeter foundation and the first beam facing portion faces the side surface of the outer perimeter foundation beam.

The demolition tool set according to another aspect of the present invention is a tool set used when demolishing a seismically isolated building having a seismic isolation device arranged in an area surrounded by a perimeter foundation formed on the ground, a seismic isolation foundation beam connected to the seismic isolation device, a perimeter foundation beam arranged facing the upper side of the perimeter foundation in the vertical direction, and a building body supported from below by the seismic isolation foundation beam and the perimeter foundation beam. This demolition tool set includes the above-mentioned demolition tools and a connecting member that connects the multiple demolition tools so that the multiple demolition tools are arranged at intervals in the arrangement direction along the perimeter foundation and the perimeter foundation beam.

With this demolition tool set, multiple demolition tools are connected by connecting members while being arranged at intervals in the arrangement direction along the outer perimeter foundation and outer perimeter foundation beams. In other words, by using the demolition tool set in the demolition work of a seismically isolated building, multiple demolition tools connected by connecting members can be placed in the gap between the outer perimeter foundation and the outer perimeter foundation beams. This allows each demolition tool to more stably maintain an attitude in which the first foundation facing portion faces the side surface of the outer perimeter foundation and the first beam facing portion faces the side surface of the outer perimeter foundation beam when the insertion portion is placed on the top surface of the outer perimeter foundation.

In the above demolition tool set, the connecting member is capable of connecting the parts of the multiple demolition tools that are located outside the perimeter foundation and the perimeter foundation beams.

In this embodiment, the parts of the multiple demolition tools placed in the gap between the perimeter foundation and the perimeter foundation beam that are located outside the perimeter foundation and the perimeter foundation beam are connected to each other by the connecting member. In other words, when multiple demolition tools are connected by the connecting member, they can be connected from the outside of the perimeter foundation and the perimeter foundation beam.

In the above dismantling tool set, the connecting member connects each of the multiple dismantling tools in a manner that allows the position of the tools to be changed by rotating them around a rotation axis that extends in a direction perpendicular to the vertical direction and the arrangement direction.

In this embodiment, when multiple dismantling tools are connected by a connecting member, each of the multiple dismantling tools can be rotated to change its position.

As described above, the present invention provides demolition tools and a demolition tool set that can ensure the safety of demolition work when demolishing a seismically isolated building.

1 is a diagram showing the state in which the demolition tool set according to the first embodiment of the present invention is applied during demolition of a seismically isolated building. FIG. 1 is a top view of the demolition tool set according to the first embodiment used in the demolition of a seismically isolated building. FIG. FIG. 2 is a perspective view of a dismantling tool constituting the dismantling tool set according to the first embodiment. 1 is a perspective view showing a state in which each dismantling tool is in a displacement restricted position in the dismantling tool set according to the first embodiment; FIG. FIG. 2 is a perspective view showing a state in which each dismantling tool is in an insertable position in the dismantling tool set according to the first embodiment. FIG. 11 is a perspective view showing a dismantling tool set according to a second embodiment.

The following describes the dismantling tool and dismantling tool set according to an embodiment of the present invention with reference to the drawings.

First Embodiment
1 and 2, a description will be given of a state in which a demolition tool set 1 equipped with a demolition tool 2 according to the first embodiment is applied during demolition of a seismically isolated building 100. Prior to describing the demolition tool set 1 and the demolition tool 2, the seismically isolated building 100 will be described.

The seismically isolated building 100 is, for example, a seismically isolated house. The seismically isolated building 100 includes a foundation 101, a foundation beam 102, a seismic isolation device 103, and a building body 104.

The foundation 101 is installed on the ground G so as to straddle the ground level GL in the up-down direction H1 (vertical direction). The foundation 101 includes a perimeter foundation 1011 and a seismic isolation foundation 1012.

The outer perimeter foundation 1011 is made of, for example, concrete. The outer perimeter foundation 1011 is formed on the ground G and forms the outer perimeter of the foundation 101. In other words, the seismically isolated building 100 is constructed in an area on the ground G surrounded by the outer perimeter foundation 1011. The outer surface 101A and inner surface 101B of the outer perimeter foundation 1011 are vertical surfaces extending perpendicular to the ground G. The upper surface 101C of the outer perimeter foundation 1011 is a surface that connects the upper edges of the outer surface 101A and inner surface 101B, and is a horizontal surface that extends horizontally parallel to the ground G.

The seismic isolation foundation 1012 is made of, for example, concrete. The seismic isolation foundation 1012 is provided in an area surrounded by the outer periphery foundation 1011 on the ground G. The seismic isolation foundation 1012 specifies the installation location of the seismic isolation device 103 in the area surrounded by the outer periphery foundation 1011. The placement location of the seismic isolation foundation 1012 in the area surrounded by the outer periphery foundation 1011 is determined according to the structure of the building body 104.

The foundation beam 102 is connected and fixed to the lower end of the building body 104, and is a beam that supports the building body 104 from below. The foundation beam 102 includes a peripheral foundation beam 1021 and a seismic isolation foundation beam 1022. The peripheral foundation beam 1021 and the seismic isolation foundation beam 1022 are connected to each other so that their respective upper surfaces for supporting the building body 104 are included in the same horizontal plane parallel to the ground G.

The outer periphery foundation beam 1021 is formed, for example, by connecting multiple steel materials. The outer periphery foundation beam 1021 is a foundation beam that is arranged facing the upper side of the outer periphery foundation 1011 in the vertical direction H1. The outer periphery foundation beam 1021 is connected and fixed to the outer periphery edge portion at the lower end of the building main body 104. The seismic isolation foundation beam 1022 is formed, for example, by connecting multiple steel materials. The seismic isolation foundation beam 1022 is a foundation beam that is connected to the seismic isolation bearing 1031 on the upper side of the seismic isolation device 103. The seismic isolation foundation beam 1022 is connected and fixed to the inner area of the outer periphery edge portion at the lower end of the building main body 104.

The building body 104 is supported from below by the outer periphery foundation beams 1021 and the seismic isolation foundation beams 1022 when the outer periphery foundation beams 1021 and the seismic isolation foundation beams 1022 are connected and fixed.

The seismic isolation device 103 is installed on the seismic isolation foundation 1012. The seismic isolation device 103 is a device that supports the building body 104 connected and fixed to the outer periphery foundation beam 1021 and the seismic isolation foundation beam 1022 so as to insulate it from the ground G. The seismic isolation device 103 makes it difficult for the shaking of the ground G caused by an earthquake or the like to be transmitted to the building body 104. The seismic isolation device 103 absorbs the vibration energy of the ground G and changes the shaking of the building body 104 to gentle lateral shaking (horizontal shaking). In other words, the seismic isolation device 103 supports the building body 104 connected and fixed to the outer periphery foundation beam 1021 and the seismic isolation foundation beam 1022 so that the horizontal movement of the building body 104 falls within a predetermined range of movement tolerance. As a result, the seismic isolation device 103 suppresses the collapse or damage of the building body 104, and also suppresses the falling of furniture and the like inside the building body 104.

The seismic isolation device 103 includes a seismic isolation bearing 1031. The seismic isolation bearing 1031 is connected and fixed to the seismic isolation foundation beam 1022, and supports the seismic isolation foundation beam 1022 from below. The seismic isolation bearing 1031 supports the seismic isolation foundation beam 1022 from below so that a gap GP is generated between the outer periphery foundation beam 1021 connected to the seismic isolation foundation beam 1022 and the outer periphery foundation 1011. In this way, the seismic isolation bearing 1031 insulates the building body 104, which is connected and fixed to the outer periphery foundation beam 1021 and the seismic isolation foundation beam 1022, from the ground G.

The structure of the seismic isolation bearing 1031 is not particularly limited, and a structure selected from a rolling bearing, a sliding bearing, and the like can be adopted. A rolling bearing is configured so that a steel ball rolls on a concave receiving plate, and there are single-ball types that use one steel ball, and double-ball types that use two types of steel balls, one large and one small. A sliding bearing is configured so that the bearing slides on a plate or plate. Note that Figure 1 shows a seismic isolation bearing 1031 that uses a double-ball type rolling bearing.

In demolition work to demolish a seismically isolated building 100 equipped with a seismic isolation device 103 as described above, heavy machinery is used to apply excessive loads to the building body 104, and work such as cutting, tensile destruction, and pushing destruction of the building body 104 is performed. If excessive loads are applied to the building body 104 during such demolition work, there is a risk that the building body 104 supported by the seismic isolation device 103 via the seismic isolation foundation beams 1022 will experience unexpected lateral shaking (horizontal shaking). In this case, there is a possibility that unexpected parts of the building body 104 will collapse, which may reduce the safety of the demolition work.

Demolition tool set 1 and demolition tools 2 are used to ensure the safety of the demolition work of seismically isolated building 100. The demolition tool set 1 and demolition tools 2 will be described with reference to Figures 3 to 5 in addition to Figures 1 and 2. Figures 1 and 2 show an example of using demolition tool set 1 in the demolition work of seismically isolated building 100, but only the demolition tools 2 provided in demolition tool set 1 may be used.

The demolition tool 2 is a tool for preventing unexpected lateral shaking of the building body 104 supported by the seismic isolation foundation beams 1022 connected to the seismic isolation device 103 during demolition work of the seismic isolated building 100. The demolition tool 2 is made of strong steel material that does not deform when a load is applied to the building body 104 during demolition work. The demolition tool 2 is formed in an H-shape when viewed from above. As shown in FIG. 3, the demolition tool 2 has an insertion portion 21, a foundation facing portion 22, and a beam facing portion 23.

The insertion part 21 is a rod-shaped member that is inserted into the gap GP between the outer periphery foundation 1011 and the outer periphery foundation beam 1021 in a horizontal insertion direction H2 along the thickness of the outer periphery foundation 1011. The insertion part 21 is placed on the upper surface 101C of the outer periphery foundation 1011 when inserted into the gap GP.

The foundation facing portion 22 is a portion of the demolition tool 2 that faces the side of the outer periphery foundation 1011. The foundation facing portion 22 has a first foundation facing portion 221 and a second foundation facing portion 222. The first foundation facing portion 221 is a portion of the foundation facing portion 22 that extends vertically from one end of the insertion portion 21 and faces the outer surface 101A of the outer periphery foundation 1011. The protruding length L21 of the first foundation facing portion 221 from the insertion portion 21 is longer than the dimension of the gap GP between the outer periphery foundation 1011 and the outer periphery foundation beam 1021. Note that the first foundation facing portion 221 does not have to extend vertically from one end of the insertion portion 21 as long as it is configured to face the outer surface 101A of the outer periphery foundation 1011. The second foundation facing portion 222 is a portion of the foundation facing portion 22 that extends vertically from the other end of the insertion portion 21 and faces the inner surface 101B of the outer periphery foundation 1011. The protruding length L31 of the second foundation facing portion 222 from the insertion portion 21 is set to be longer than the dimension of the gap GP between the outer periphery foundation 1011 and the outer periphery foundation beam 1021, and is set to the same value as the protruding length L21 of the first foundation facing portion 221. Note that the second foundation facing portion 222 does not have to extend vertically from the other end of the insertion portion 21 as long as it is configured to face the inner surface 101B of the outer periphery foundation 1011. The foundation facing portion 22 sandwiches the outer periphery foundation 1011 when the first foundation facing portion 221 faces the outer surface 101A of the outer periphery foundation 1011 and the second foundation facing portion 222 faces the inner surface 101B of the outer periphery foundation 1011.

The beam facing portion 23 is a portion of the demolition tool 2 that faces the side of the outer periphery foundation beam 1021. The beam facing portion 23 has a first beam facing portion 231 and a second beam facing portion 232. The first beam facing portion 231 is a portion of the beam facing portion 23 that extends vertically from the other end of the insertion portion 21 to the opposite side of the second foundation facing portion 222 and faces the inner surface 102B of the outer periphery foundation beam 1021. The protruding length L41 of the first beam facing portion 231 from the insertion portion 21 is longer than the dimension of the gap GP between the outer periphery foundation 1011 and the outer periphery foundation beam 1021. Note that the first beam facing portion 231 does not have to extend vertically from the other end of the insertion portion 21 as long as it is configured to face the inner surface 102B of the outer periphery foundation beam 1021. The second beam facing portion 232 is a portion of the beam facing portion 23 that extends vertically from one end of the insertion portion 21 to the opposite side of the first foundation facing portion 221 and faces the outer surface 102A of the outer periphery foundation beam 1021. The protruding length L51 of the second beam facing portion 232 from the insertion portion 21 is longer than the dimension of the gap GP between the outer periphery foundation 1011 and the outer periphery foundation beam 1021, and is set to the same value as the protruding length L41 of the first beam facing portion 231. Note that the second beam facing portion 232 does not have to extend vertically from one end of the insertion portion 21 as long as it is configured to face the outer surface 102A of the outer periphery foundation beam 1021.

In the demolition tool 2, when the insertion portion 21 is inserted into the gap GP between the outer periphery foundation 1011 and the outer periphery foundation beam 1021 and placed on the upper surface 101C of the outer periphery foundation 1011, the first foundation facing portion 221 and the second foundation facing portion 222 face both side surfaces 101A, 101B of the outer periphery foundation 1011 so as to sandwich the outer periphery foundation 1011, and the first beam facing portion 231 and the second beam facing portion 232 face both side surfaces 102A, 102B of the outer periphery foundation beam 1021. In this configuration, when the first foundation facing portion 221 is in contact with the outer surface 101A of the outer periphery foundation 1011 and the first beam facing portion 231 is in contact with the inner surface 102B of the outer periphery foundation beam 1021, the horizontal displacement of the outer periphery foundation beam 1021 inward in the insertion direction H2 relative to the outer periphery foundation 1011 is restricted. Furthermore, when the second foundation facing portion 222 is in contact with the inner surface 101B of the outer periphery foundation 1011 and the second beam facing portion 232 is in contact with the outer surface 102A of the outer periphery foundation beam 1021, the horizontal displacement of the outer periphery foundation beam 1021 in the insertion direction H2 outward relative to the outer periphery foundation 1011 is restricted. This restriction of the displacement of the outer periphery foundation beam 1021 also restricts the displacement of the building body 104 supported by the outer periphery foundation beam 1021 and the seismic isolation foundation beam 1022. As a result, in the demolition work of the seismic isolation building 100, it is possible to suppress the building body 104 supported by the seismic isolation foundation beam 1022 connected to the seismic isolation device 103 from causing unexpected lateral shaking. Therefore, it is possible to prevent the collapse of unexpected parts of the building body 104 during the demolition work, so it is possible to ensure the safety of the demolition work.

In addition, in the demolition tool 2, the distance between the first foundation facing portion 221 and the first beam facing portion 231 in the insertion direction H2 and the distance between the second foundation facing portion 222 and the second beam facing portion 232 in the insertion direction H2 are the same value and correspond to the length of the insertion portion 21 in the insertion direction H2. The distance is set to satisfy the following formula (1).
{(D−T1)+(D−T2)}<A...(1)

In formula (1), "D" indicates the separation distance, "T1" indicates the thickness of the outer perimeter foundation 1011, "T2" indicates the thickness of the outer perimeter foundation beam 1021 along the insertion direction H2, and "A" indicates the horizontal movement allowance of the building body 104 by the seismic isolation device 103.

The "(D-T1)" on the left side of the above formula (1) represents the sum of the gap dimensions between the first foundation facing portion 221 and the second foundation facing portion 222 and the outer periphery foundation 1011. The "(D-T2)" on the left side of the above formula (1) represents the sum of the gap dimensions between the first beam facing portion 231 and the second beam facing portion 232 and the outer periphery foundation beam 1021.

In other words, the separation distance D is set to satisfy the above formula (1), so that the sum of the gap dimension between the first foundation facing portion 221 and the outer periphery foundation 1011 and the gap dimension between the first beam facing portion 231 and the outer periphery foundation beam 1021 is smaller than half the allowable movement amount A of the building body 104 by the seismic isolation device 103.

As described above, the separation distance D is set based on the horizontal movement allowance A of the building body 104 by the seismic isolation device 103. As a result, when the outer periphery foundation beam 1021 attempts to displace relative to the outer periphery foundation 1011 beyond the movement allowance A of the seismic isolation device 103, the first foundation facing portion 221 and the second foundation facing portion 222 are sure to contact the side surfaces 101A, 101B of the outer periphery foundation 1011, and the first beam facing portion 231 and the second beam facing portion 232 are sure to contact the side surfaces 102A, 102B of the outer periphery foundation beam 1021. Therefore, the horizontal displacement of the outer periphery foundation beam 1021 relative to the outer periphery foundation 1011 can be made smaller than the movement allowance A of the seismic isolation device 103.

It is preferable that the insertion portion 21 has a mounting portion 211 having a surface extending parallel to the upper surface 101C of the outer periphery foundation 1011 when the first foundation facing portion 221 and the second foundation facing portion 222 face the side surfaces 101A and 101B of the outer periphery foundation 1011 and the first beam facing portion 231 and the second beam facing portion 232 face the side surfaces 102A and 102B of the outer periphery foundation beam 1021. In this case, the insertion portion 21 is made of, for example, a steel material made of a square tube or a square column having the mounting portion 211. In the example shown in FIG. 3, the insertion portion 21 is made of a steel material made of a square tube. This allows the insertion portion 21 to maintain a stable mounting state on the upper surface 101C of the outer periphery foundation 1011. Therefore, when the insertion portion 21 is placed on the upper surface 101C of the outer periphery foundation 1011, the demolition tool 2 can stably maintain a posture (hereinafter referred to as the "displacement restriction posture") in which the first foundation facing portion 221 and the second foundation facing portion 222 face the side surfaces 101A and 101B of the outer periphery foundation 1011, and the first beam facing portion 231 and the second beam facing portion 232 face the side surfaces 102A and 102B of the outer periphery foundation beam 1021. As a result, unexpected lateral shaking of the building body 104 can be stably suppressed during the demolition work of the seismically isolated building 100.

3, the first foundation facing portion 221 and the second beam facing portion 232 are integrally formed and are composed of a rod-shaped member connected and fixed to one end of the insertion portion 21. Similarly, the second foundation facing portion 222 and the first beam facing portion 231 are integrally formed and are composed of a rod-shaped member connected and fixed to the other end of the insertion portion 21. In this configuration, the demolition tool 2 can be realized by a simple structure in which rod-shaped members are connected and fixed to one end and the other end of the rod-shaped insertion portion 21 so as to have an H-shaped shape in a plan view. In this case, the shape of each rod-shaped member, that is, the rod-shaped member constituting the first foundation facing portion 221 and the second beam facing portion 232 and the rod-shaped member constituting the second foundation facing portion 222 and the first beam facing portion 231, is not particularly limited. Each rod-shaped member may be composed of a steel material consisting of a square tube or a square column, like the insertion portion 21. In the example shown in FIG. 3, each rod-shaped member is composed of a steel material consisting of a square tube.

In addition, when the demolition tool 2 is in the displacement-restricted position, in the direction H3 along the outer periphery foundation 1011 perpendicular to the up-down direction H1 and the insertion direction H2 (hereinafter referred to as the "arrangement direction H3"), the width dimension W11 of the insertion portion 21, the width dimension W31 of the second foundation facing portion 222, and the width dimension W41 of the first beam facing portion 231 are shorter than the dimension of the gap GP between the outer periphery foundation 1011 and the outer periphery foundation beam 1021. In addition, in the first foundation facing portion 221 and the second foundation facing portion 222 that constitute the foundation facing portion 22, the second foundation facing portion 222 is the facing portion on the side that is arranged inside the outer periphery foundation 1011. In addition, in the first beam facing portion 231 and the second beam facing portion 232 that constitute the beam facing portion 23, the first beam facing portion 231 is the facing portion on the side that is arranged inside the outer periphery foundation 1011.

In this case, with the demolition tool 2 rotated 90 degrees from the displacement-restricting posture around a rotation axis extending in the insertion direction H2 to a posture (hereinafter referred to as the "insertable posture"), the insertion portion 21, the second foundation facing portion 222, and the first beam facing portion 231 can pass through the gap GP from the outside to the inside of the outer periphery foundation 1011 and the outer periphery foundation beam 1021. Then, with the insertion portion 21 positioned in the gap GP and the second foundation facing portion 222 and the first beam facing portion 231 positioned inside the outer periphery foundation 1011 and the outer periphery foundation beam 1021, the demolition tool 2 is rotated 90 degrees from the insertion-restricting posture to a displacement-restricting posture. This allows the demolition tool 2 to be placed in the gap GP with the insertion portion 21 placed on the upper surface 101C of the outer periphery foundation 1011, the first foundation facing portion 221 and the second foundation facing portion 222 facing the side surfaces 101A and 101B of the outer periphery foundation 1011, and the first beam facing portion 231 and the second beam facing portion 232 facing the side surfaces 102A and 102B of the outer periphery foundation beam 1021.

In the example shown in FIG. 3, the width dimension W11 of the insertion portion 21, the width dimension W31 of the second foundation facing portion 222, and the width dimension W41 of the first beam facing portion 231 are set to the same value that is shorter than the dimension of the gap GP.

When the demolition tool 2 is in the displacement-restricted position, the width dimension W12 in the vertical direction H1 of the insertion portion 21 is shorter than the dimension of the gap GP between the outer periphery foundation 1011 and the outer periphery foundation beam 1021. For example, the width dimensions W11 and W12 in the insertion portion 21 are set to the same value. The width dimension W32 in the insertion direction H2 of the second foundation facing portion 222 does not need to be set to a value shorter than the dimension of the gap GP between the outer periphery foundation 1011 and the outer periphery foundation beam 1021. The width dimension W32 of the second foundation facing portion 222 may be set to a value equal to or greater than the dimension of the gap GP, but is set to the same value as the width dimension W31, which is shorter than the dimension of the gap GP. Similarly, the width dimension W42 in the insertion direction H2 of the first beam facing portion 231 does not need to be set to a value shorter than the dimension of the gap GP between the outer periphery foundation 1011 and the outer periphery foundation beam 1021. The width dimension W42 of the first beam opposing portion 231 may be set to a value equal to or greater than the dimension of the gap GP, but is set to the same value as the width dimension W41, which is shorter than the dimension of the gap GP.

In the first foundation facing portion 221, the width dimension W21 along the arrangement direction H3 and the width dimension W22 along the insertion direction H2 do not need to be set to a value shorter than the dimension of the gap GP between the outer periphery foundation 1011 and the outer periphery foundation beam 1021. The width dimensions W21 and W22 of the first foundation facing portion 221 may be set to a value equal to or greater than the dimension of the gap GP, but are set to the same values as the width dimensions W31 and W32 of the second foundation facing portion 222, which are shorter than the dimension of the gap GP. Similarly, in the second beam facing portion 232, the width dimension W51 along the arrangement direction H3 and the width dimension W52 along the insertion direction H2 do not need to be set to a value shorter than the dimension of the gap GP between the outer periphery foundation 1011 and the outer periphery foundation beam 1021. The width dimension W51 and width dimension W52 of the second beam opposing portion 232 may be set to a value equal to or greater than the dimension of the gap GP, but are set to the same value as the width dimension W41 and width dimension W42 of the first beam opposing portion 231, which are shorter than the dimension of the gap GP.

In this embodiment, the width dimensions W11, W12 of the insertion portion 21, the width dimensions W21, W22 of the first foundation facing portion 221, the width dimensions W31, W32 of the second foundation facing portion 222, the width dimensions W41, W42 of the first beam facing portion 231, and the width dimensions W51, W52 of the second beam facing portion 232 are all set to the same value. This allows the rod-shaped member constituting the insertion portion 21, the rod-shaped member constituting the first foundation facing portion 221 and the second beam facing portion 232, and the rod-shaped member constituting the second foundation facing portion 222 and the first beam facing portion 231 to be made of the same steel material made of a square tube or a square column. In other words, a dismantling tool 2 that is H-shaped in plan view can be made using a single type of steel material.

Next, the demolition tool set 1 will be described with reference to Figures 1, 2, 4, and 5. The demolition tool set 1 is a tool set used in the demolition work of the seismically isolated building 100. As shown in Figure 2, the demolition tool set 1 is installed at multiple locations along the outer periphery foundation 1011 and the outer periphery foundation beams 1021. The demolition tool set 1 comprises the above-mentioned multiple demolition tools 2 and a connecting member 3. The number of demolition tools 2 provided in the demolition tool set 1 is not particularly limited as long as it is two or more. The demolition tool set 1 comprises, for example, two demolition tools 2.

The connecting member 3 connects the multiple demolition tools 2 so that the multiple demolition tools 2 are arranged at intervals in the arrangement direction H3 along the outer periphery foundation 1011 and the outer periphery foundation beam 1021. By using the demolition tool set 1 in the demolition work of the seismically isolated building 100, the multiple demolition tools 2 connected by the connecting member 3 can be placed in the gap GP between the outer periphery foundation 1011 and the outer periphery foundation beam 1021. As a result, when the insertion portion 21 is placed on the upper surface 101C of the outer periphery foundation 1011, each demolition tool 2 can more stably maintain an attitude in which the first foundation facing portion 221 and the second foundation facing portion 222 face the side surfaces 101A and 101B of the outer periphery foundation 1011, and the first beam facing portion 231 and the second beam facing portion 232 face the side surfaces 102A and 102B of the outer periphery foundation beam 1021.

The connecting member 3 can connect the portions of the multiple demolition tools 2 that are located outside the outer perimeter foundation 1011 and the outer perimeter foundation beam 1021. Specifically, as shown in FIG. 4, when the multiple demolition tools 2 are in the displacement-restricted position, the connecting member 3 connects the rod-shaped members that make up the first foundation facing portion 221 and the second beam facing portion 232 of each demolition tool 2 near the center in the vertical direction H1. In this case, when multiple demolition tools 2 are connected by the connecting member 3, they can be connected from the outside of the outer perimeter foundation 1011 and the outer perimeter foundation beam 1021.

As shown in FIG. 4, the connecting member 3 includes a connecting plate 31, a connecting bolt 32, and a connecting piece 33. The connecting plate 31 is a plate-shaped member extending in the arrangement direction H3, and has the same number of bolt insertion holes 311 as the number of demolition tools 2 to be connected. The bolt insertion holes 311 are holes through which the shanks of the connecting bolts 32 are inserted, and are formed as elongated holes along the arrangement direction H3. The connecting plate 31 is made of the same type of steel as the demolition tools 2. The connecting piece 33 is fixed to a rod-shaped member that constitutes the first foundation facing portion 221 and the second beam facing portion 232 of the demolition tools 2. The connecting piece 33 has an insertion hole through which the shanks of the connecting bolts 32 are inserted. In the connecting member 3 configured in this way, the connecting bolt 32 is inserted into the bolt insertion hole 311 of the connecting plate 31 and the insertion hole of the connecting piece 33, and the connecting bolt 32 is screwed into the nut 321 to fasten the connecting plate 31 and the connecting piece 33, thereby connecting multiple dismantling tools 2. Note that the connecting piece 33 may be omitted to connect multiple dismantling tools 2.

The connecting member 3 also connects each of the multiple dismantling tools 2 in such a way that their posture can be changed by rotating them about a rotation axis J1 that extends in an insertion direction H2 perpendicular to the vertical direction H1 and the arrangement direction H3. That is, when the multiple dismantling tools 2 are connected by the connecting member 3, each of the multiple dismantling tools 2 can be rotated about the rotation axis J1 to change its posture. Specifically, with the connecting bolt 32 loosening the fastening between the connecting plate 31 and the connecting piece 33, the posture of each dismantling tool 2 can be changed by rotating the connecting bolt 32 as the rotation axis J1.

When dismantling the seismically isolated building 100, when placing the demolition tool set 1 in the gap GP between the outer periphery foundation 1011 and the outer periphery foundation beam 1021, the fastening of the connecting plate 31 and the connecting piece 33 by the connecting bolt 32 is loosened to place each demolition tool 2 in an insertable position (see Figure 5). As mentioned above, the insertable position is the position in which each demolition tool 2 is rotated 90 degrees around the rotation axis J1 from the state in which each demolition tool 2 is in the displacement-restricted position shown in Figure 4.

With each demolition tool 2 in the insertion-enabled position, the insertion portion 21, the second foundation facing portion 222, and the first beam facing portion 231 of each demolition tool 2 are passed through the gap GP from the outside to the inside of the outer periphery foundation 1011 and the outer periphery foundation beam 1021. Then, with the insertion portion 21 positioned in the gap GP and the second foundation facing portion 222 and the first beam facing portion 231 positioned inside the outer periphery foundation 1011 and the outer periphery foundation beam 1021, each demolition tool 2 is rotated 90 degrees from the insertion-enabled position to the displacement-restricted position. With each demolition tool 2 in this displacement-restricted position, the connecting plate 31 and the connecting piece 33 are fastened and fixed by the connecting bolt 32. As a result, with each demolition tool 2 connected by the connecting member 3 and in the displacement-restricted position, each demolition tool 2 can be placed in the gap GP between the outer periphery foundation 1011 and the outer periphery foundation beam 1021.

When each demolition tool 2 in the demolition tool set 1 is in the displacement-restricting position, the insertion portion 21 of each demolition tool 2 is placed on the upper surface 101C of the outer periphery foundation 1011, the first foundation facing portion 221 and the second foundation facing portion 222 face the side surfaces 101A and 101B of the outer periphery foundation 1011, and the first beam facing portion 231 and the second beam facing portion 232 face the side surfaces 102A and 102B of the outer periphery foundation beam 1021. As a result, in a state in which the first foundation facing portion 221 and the second foundation facing portion 222 are in contact with the side surfaces 101A and 101B of the outer periphery foundation 1011 and the first beam facing portion 231 and the second beam facing portion 232 are in contact with the side surfaces 102A and 102B of the outer periphery foundation beam 1021, the horizontal displacement of the outer periphery foundation beam 10 relative to the outer periphery foundation 1011 can be restricted. By restricting the displacement of the outer perimeter foundation beams 1021, the displacement of the building body 104 supported by the outer perimeter foundation beams 1021 and the seismic isolation foundation beams 1022 is also restricted. This makes it possible to prevent the building body 104 supported by the seismic isolation foundation beams 1022 connected to the seismic isolation device 103 from shaking sideways unexpectedly during the demolition work of the seismic isolated building 100. This makes it possible to prevent the collapse of unexpected parts of the building body 104 during the demolition work, thereby ensuring the safety of the demolition work.

Second Embodiment
A dismantling tool set 1A including a dismantling tool 2A according to a second embodiment will be described with reference to FIG.

The demolition tool 2A, like the demolition tool 2 according to the first embodiment described above, is made of strong steel material that will not deform when a load is applied to the building body 104 during demolition work. The demolition tool 2A has an insertion portion 21, a foundation facing portion 22, and a beam facing portion 23.

The differences between demolition tool 2A and demolition tool 2 are as follows. That is, in demolition tool 2, foundation facing portion 22 has first foundation facing portion 221 and second foundation facing portion 222, whereas in demolition tool 2A, foundation facing portion 22 has only first foundation facing portion 221. Also, in demolition tool 2, beam facing portion 23 has first beam facing portion 231 and second beam facing portion 232, whereas in demolition tool 2A, beam facing portion 23 has only first beam facing portion 231. Other than these, demolition tool 2A is configured in the same way as demolition tool 2.

In other words, the demolition tool 2A includes an insertion portion 21, a first foundation facing portion 221, and a first beam facing portion 231. The insertion portion 21 is placed on the upper surface 101C of the outer periphery foundation 1011 while being inserted into the gap GP between the outer periphery foundation 1011 and the outer periphery foundation beam 1021. The first foundation facing portion 221 extends vertically from one end of the insertion portion 21 and faces the side surface of the outer periphery foundation 1011. The first beam facing portion 231 extends vertically from the other end of the insertion portion 21 to the opposite side to the first foundation facing portion 221 and faces the side surface of the outer periphery foundation beam 1021.

In the demolition tool 2A, when the insertion portion 21 is inserted into the gap GP between the outer periphery foundation 1011 and the outer periphery foundation beam 1021 and placed on the upper surface 101C of the outer periphery foundation 1011, if the first foundation facing portion 221 faces the outer surface 101A of the outer periphery foundation 1011, the first beam facing portion 231 faces the inner surface 102B of the outer periphery foundation beam 1021. On the other hand, if the first foundation facing portion 221 faces the inner surface 101B of the outer periphery foundation 1011, the first beam facing portion 231 faces the outer surface 102A of the outer periphery foundation beam 1021. In this configuration, when the first foundation facing portion 221 is in contact with the side surface of the outer periphery foundation 1011 and the first beam facing portion 231 is in contact with the side surface of the outer periphery foundation beam 1021, the horizontal displacement of the outer periphery foundation beam 1021 relative to the outer periphery foundation 1011 is restricted. By restricting the displacement of the outer perimeter foundation beams 1021, the displacement of the building body 104 supported by the outer perimeter foundation beams 1021 and the seismic isolation foundation beams 1022 is also restricted. This makes it possible to prevent the building body 104 supported by the seismic isolation foundation beams 1022 connected to the seismic isolation device 103 from experiencing unexpected lateral shaking during the demolition work of the seismic isolation building 100.

In addition, in the demolition tool 2A, the separation distance D along the insertion direction H2 between the first foundation facing portion 221 and the first beam facing portion 231 is set to satisfy the above formula (1). As a result, when the outer periphery foundation beam 1021 attempts to displace relative to the outer periphery foundation 1011 beyond the movement allowance A of the seismic isolation device 103, the first foundation facing portion 221 contacts the side of the outer periphery foundation 1011 and the first beam facing portion 231 contacts the side of the outer periphery foundation beam 1021. Therefore, the horizontal displacement of the outer periphery foundation beam 1021 relative to the outer periphery foundation 1011 can be made smaller than the movement allowance A of the seismic isolation device 103.

The demolition tool set 1A is installed at multiple locations along the outer perimeter foundation 1011 and the outer perimeter foundation beams 1021. The demolition tool set 1A includes the multiple demolition tools 2A and the connecting member 3. The demolition tool set 1A includes, for example, two demolition tools 2A.

The connecting member 3 connects the two demolition tools 2A so that they are arranged at intervals in the arrangement direction H3 along the outer periphery foundation 1011 and the outer periphery foundation beam 1021. In the example shown in FIG. 6, the connecting member 3 connects the first foundation facing portion 221 of one demolition tool 2A to the first beam facing portion 231 of the other demolition tool 2A. In the demolition tool set 1A in such a connected state, the first foundation facing portions 221 of the two demolition tools 2A face both side surfaces 101A and 101B of the outer periphery foundation 1011 so as to sandwich the outer periphery foundation 1011, and the first beam facing portions 231 of the two demolition tools 2A face both side surfaces 102A and 102B of the outer periphery foundation beam 1021. This makes it possible to restrict horizontal displacement of the outer periphery foundation beam 1021 relative to the outer periphery foundation 1011 in the insertion direction H2 on both sides.

REFERENCE SIGNS LIST 1, 1A Demolition tool set 2, 2A Demolition tool 21 Insertion portion 22 Foundation facing portion 221 First foundation facing portion 222 Second foundation facing portion 23 Beam facing portion 231 First beam facing portion 232 Second beam facing portion 3 Connection member 100 Seismic isolated building 1011 Periphery foundation 1012 Seismic isolated foundation 1021 Periphery foundation beam 1022 Seismic isolated foundation beam 103 Seismic isolation device 104 Building body GP Gap

Claims (9)

A demolition tool used when demolishing a seismically isolated building having a seismic isolation device arranged in an area surrounded by a perimeter foundation formed on the ground, a seismic isolation foundation beam connected to the seismic isolation device, a perimeter foundation beam arranged facing the upper side of the perimeter foundation in the up-down direction, and a building body supported from below by the seismic isolation foundation beam and the perimeter foundation beam,
An insertion portion that is inserted into the gap between the outer periphery foundation and the outer periphery foundation beam in an insertion direction along the thickness of the outer periphery foundation and placed on an upper surface of the outer periphery foundation;
a first foundation facing portion extending from one end of the insertion portion and facing a side surface of the outer periphery foundation;
A first beam opposing portion extends from the other end of the insertion portion to a side opposite to the first foundation opposing portion and faces a side surface of the outer periphery foundation beam,
A demolition tool that restricts horizontal displacement of the outer perimeter foundation beam relative to the outer perimeter foundation when the first foundation facing portion contacts the side of the outer perimeter foundation and the first beam facing portion contacts the side of the outer perimeter foundation beam. a second foundation facing portion extending from the other end of the insertion portion in the same direction as the first foundation facing portion and facing a side surface of the outer periphery foundation;
A second beam opposing portion extends from one end of the insertion portion in the same direction as the first beam opposing portion and faces a side surface of the outer periphery foundation beam,
A demolition tool as described in claim 1, which restricts horizontal displacement of the outer perimeter foundation beam relative to the outer perimeter foundation when the second foundation facing portion contacts the side of the outer perimeter foundation and the second beam facing portion contacts the side of the outer perimeter foundation beam. The first foundation facing portion and the second beam facing portion are integrally formed and are connected and fixed to one end of the insertion portion,
The demolition tool according to claim 2 , wherein the second foundation facing portion and the first beam facing portion are integrally formed and connected and fixed to the other end of the insertion portion. The demolition tool according to any one of claims 1 to 3, wherein a distance between the first foundation facing portion and the first beam facing portion along the insertion direction is set to satisfy the following formula (1).
{(D−T1)+(D−T2)}<A...(1)
[In formula (1), "D" indicates the distance between the first foundation facing portion and the first beam facing portion along the insertion direction, "T1" indicates the thickness of the outer periphery foundation, "T2" indicates the thickness of the outer periphery foundation beam along the insertion direction, and "A" indicates the horizontal movement allowance of the building body by the seismic isolation device.] The demolition tool according to any one of claims 1 to 4, wherein the insertion portion and the opposing portion of the first foundation opposing portion and the first beam opposing portion that is disposed on the inside of the outer perimeter foundation have a width dimension that is shorter than the dimension of the gap between the outer perimeter foundation and the outer perimeter foundation beam in the vertical direction and the direction perpendicular to the insertion direction. The demolition tool according to any one of claims 1 to 5, wherein the insertion portion is configured with a mounting portion having a surface extending parallel to the upper surface of the outer perimeter foundation when the first foundation facing portion faces the side surface of the outer perimeter foundation and the first beam facing portion faces the side surface of the outer perimeter foundation beam. A demolition tool set used in demolishing a seismically isolated building, the seismically isolated building having a seismic isolation device arranged in an area surrounded by a perimeter foundation formed on the ground, a seismic isolation foundation beam connected to the seismic isolation device, a perimeter foundation beam arranged facing the upper side of the perimeter foundation in the up-down direction, and a building body supported from below by the seismic isolation foundation beam and the perimeter foundation beam,
The dismantling tool according to any one of claims 1 to 6,
a connecting member that connects the plurality of demolition tools so that the plurality of demolition tools are arranged at intervals in an arrangement direction along the perimeter foundation and the perimeter foundation beams, The dismantling tool set according to claim 7, wherein the connecting member is capable of connecting the portions of the multiple dismantling tools that are located outside the outer perimeter foundation and the outer perimeter foundation beam. The dismantling tool set according to claim 7 or 8, wherein the connecting member connects each of the multiple dismantling tools in such a way that the position of each tool can be changed by rotating the tool around a rotation axis that extends in a direction perpendicular to the vertical direction and the arrangement direction.

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