JP2014234921A - Base isolation floor structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolation floor structure capable of making an installation space compact by decreasing the number of restoration mechanisms (restoration springs, constant load springs) to be installed, while securing a base isolation performance.SOLUTION: The base isolation floor structure comprises: a base isolation floor body 2 on which a base isolation object is mounted; a support part 3 in which the base isolation floor body 2 is installed via a slide material and the base isolation floor body 2 is supported in a slidable manner; and a restoration mechanism 6 which is provided while connecting to the support part 3 and the base isolation floor body 2 and suppresses excessive displacement of the base isolation floor body 2, for restoring the displaced base isolation floor body 2 at an original position. The restoration mechanism 6 includes: a constant load spring 7 integrally provided in the support part 3; a moving pulley 9 which is connected to the base isolation floor body 2 via a connection part 8 and provided so as to follow the base isolation floor body 2; and a rope body 10 of which one end 10a is connected to the constant load spring 7 and another end 10b is connected to the support part 3, respectively, and which is wound around the moving pulley 9 while applying a fixed tensile force with spring elasticity of the constant load spring 7.

Description

  The present invention relates to a base-isolated floor structure.

  As a means of reducing damage to building floors and precision equipment in the event of an earthquake, a base-isolated object is placed on top and a base-isolated floor that suppresses the transmission of vibration to this base-isolated object (base-isolated floor structure) Is frequently used.

  For example, in Patent Document 1, a flat base having a plurality of upward convex curved surface portions aligned on the upper surface and a lower surface are formed substantially flat, and are slidably provided on the base. In addition, a base-isolated floor (base-isolated floor structure) configured with a flat plate-like sliding board is disclosed. In this seismic isolation floor, it is possible to prevent vibration from being transmitted by the sliding plate moving on the base by inertia during an earthquake. Further, by constructing the base isolation floor with a thin flat base and a sliding plate, the floor surface can be lowered, and the internal effective space of the building or the like can be widened accordingly. In other words, the base isolation and the sliding plate steel plates are simply stacked, and the seismic isolation effect that reduces acceleration is achieved simply and at low cost. Even when installed on an existing floor, the thickness is small and the steps can be reduced, making it easy to use. A good seismic isolation floor can be provided.

  On the other hand, in the base-isolated floor structure of Patent Document 1, there is no possibility of a residual displacement after the earthquake because there is no restoration mechanism for returning the stacked steel plates to their original positions. When a residual displacement occurs, it can be returned to the original position with, for example, a portable hydraulic jack, but it is desirable to provide a restoring mechanism that makes the residual displacement substantially zero.

   On the other hand, in Patent Document 2, a seismic isolation floor (base isolation floor main body part) 2 on which the seismic isolation object 1 is placed is supported on a support part 3 such as a structural floor of a building so as to be horizontally displaceable. In addition, a seismic isolation floor structure A is disclosed in which a sliding material 4 is integrally fixed to the bottom surface of the seismic isolation floor 2 so as to be slidable in each horizontal direction on the support portion 3 (see FIG. 7). And by comprising in this way, the seismic isolation floor 2 can be made thin, a floor surface can be made low, and it becomes possible to make the effective space inside buildings etc. wide by that much.

  Further, in Patent Document 2, a plurality of constant load springs (restoration mechanisms, restoration springs) 5 are respectively interposed between the base isolation floor 2 and the support portion 3, and the constant load spring 5 is preloaded as a preload. A tensile force is applied. By providing this constant load spring 5, it is possible to suppress excessive displacement of the seismic isolation floor 2 and, in turn, the seismic isolation object 1 in the horizontal direction during an earthquake, and to restore the original position after the earthquake. Become. In Patent Document 2, the residual displacement is greatly reduced while suppressing an increase in response acceleration of the base isolation floor 2 to about 10 to 20% with the conventional constant load spring 5 of about 0.1 to 0.2 times. .

Japanese Patent No. 5002724 JP 2013-064418 A

  However, in the seismic isolation floor structure of Patent Document 2, a plurality of constant load springs (restoration mechanism, restoration spring) are respectively interposed between the seismic isolation floor (base isolation floor main body) and the support. Because it is installed around the base isolation floor so that it protrudes outward from the base isolation floor, there is a possibility that the constant load spring may obstruct the passage and the usability of the floor may deteriorate. There was room left.

  In view of the above circumstances, the present invention provides a seismic isolation floor structure that reduces the number of installations of restoring mechanisms (restoring springs, constant load springs) and makes the installation space compact while ensuring seismic isolation performance. The purpose is to do.

  In order to achieve the above object, the present invention provides the following means.

  The base-isolated floor structure of the present invention includes a base-isolated floor main body on which a base-isolated object is mounted, and the base-isolated floor main body is installed via a sliding material, and the base-isolated floor main body is slidably supported. And a support part that is connected to the support part and the base isolation floor main body part to suppress excessive displacement of the base isolation floor main body part and restore the displaced base isolation floor main body part to the original position. And a constant load spring provided integrally with the support portion, and the base isolation floor main body portion connected to the base isolation floor main body portion via a connecting portion. A movable pulley provided to be driven, one end connected to the constant load spring and the other end connected to the support portion, and a constant tensile force is applied by spring elasticity of the constant load spring. It is characterized by comprising a cable body wound around a pulley.

  Further, in the base isolation floor structure of the present invention, the connecting portion is at least one other movable pulley supported directly or indirectly by the base isolation floor main body portion, and one end of the dynamic pulley or the other. The movable pulley may be configured to include at least one other cable body provided with the other end connected to the support portion.

  The base-isolated floor structure of the present invention includes a base-isolated floor main body on which a base-isolated object is mounted, and the base-isolated floor main body is installed via a sliding material, and the base-isolated floor main body is slidably supported. And a support part that is connected to the support part and the base isolation floor main body part to suppress excessive displacement of the base isolation floor main body part and restore the displaced base isolation floor main body part to the original position. And a constant load spring provided integrally with the support portion, and the base isolation floor main body portion connected to the base isolation floor main body portion via a connecting portion. A movable pulley provided to be driven, a fixed pulley supported and fixed to the support portion so as to follow the support portion, one end to the constant load spring, and the other end to the seismic isolation floor main body. And a constant tensile force is applied by the spring elasticity of the constant load spring. Characterized in that it is constituted by a said movable pulley and rope body wound around the fixed pulley in state.

  Further, in the base isolation floor structure of the present invention, the support portion is composed of a floor member and a wall member, the base isolation floor main body is installed on the floor member of the support portion, and at least a constant load spring of the restoring mechanism is provided. It may be provided integrally connected to the wall member of the support portion.

  The base-isolated floor structure of the present invention uses a moving pulley, or a combination of a moving pulley and a fixed pulley, or a plurality of moving pulleys are connected to form a restoring mechanism to form a base isolation body (base-isolating floor). It is possible to suppress the excessive displacement of the seismic isolation and to apply the force (load) necessary to restore the displaced base-isolated floor body to its original position by the spring elastic force of a constant load spring smaller than that. Become. Thereby, compared with the past, a constant load spring (restoration spring) can be made small, and it becomes possible to make a spring installation space compact.

It is a top view showing the base isolation floor structure concerning a 1st embodiment of the present invention. It is a top view which shows the seismic isolation floor structure which concerns on 2nd Embodiment of this invention. It is a top view which shows the seismic isolation floor structure which concerns on 3rd Embodiment of this invention. It is a top view which shows the seismic isolation floor structure which concerns on 4th Embodiment of this invention. It is a side view which shows the example of a change of the seismic isolation floor structure of this invention. FIG. 6 is a view taken along line X1-X1 in FIG. 5. It is a figure which shows the conventional seismic isolation floor structure.

  Hereinafter, with reference to FIG. 1, the seismic isolation floor structure which concerns on 1st Embodiment of this invention is demonstrated. In addition, the same code | symbol is attached | subjected and demonstrated about the structure similar to the conventional seismic isolation floor structure A shown in FIG.

  As shown in FIG. 1 (and FIG. 7), the base isolation floor structure B of the present embodiment includes a base isolation floor body (base isolation floor) 2 on which the base isolation object 1 is mounted, and a base isolation floor main body. A part 2 is installed via a sliding material 4, and is provided with a support part 3 that slidably supports the base isolation floor main part 2, a support part 3 and the base isolation floor main part 2, and is provided with a base isolation floor. While suppressing the excessive displacement of the main-body part 2, it is provided with the restoring mechanism 6 for restoring the displaced seismic isolation floor main-body part 2 to an original position.

  Here, in the present embodiment, the sliding material 4 is integrally fixed to the bottom surface of the base isolation floor main body 2, and the support portion 3, which is the structural floor of the base isolation floor main body 2, is placed horizontally through the sliding material 4. It is slidable in each direction. In addition, the seismic isolation floor main body 2 is stably placed in a fixed position (original position) at the normal time, and vibration energy acts from the support part 3 of the structural floor and slides on the support part 3 at the time of an earthquake. Slide in any direction from the original position. Thereby, it is comprised so that the vibration at the time of an earthquake may not be transmitted to the seismic isolation object 1 on the base isolation floor main-body part 2. FIG. In this embodiment, the sliding material 4 is provided on the bottom surface of the seismic isolation floor main body 2. However, of course, the sliding material 4 is provided on the support 3 of the structural floor, and the seismic isolation floor main body is provided thereon. You may make it install the part 2 so that sliding is possible.

  On the other hand, the restoration mechanism 6 of the present embodiment is connected to a constant load spring (restoration spring) 7 provided integrally with the support portion 3 and the seismic isolation floor main body portion 2 via a connecting portion 8 such as a wire or a bar. The movable pulley 9 provided to follow the seismic isolation floor main body 2, one end 10 a connected to the constant load spring 7, and the other end 10 b connected to the support portion 3 via the fixed point 11, respectively. 7 is provided with a wire (cord) 10 wound around a movable pulley 9 in a state in which a constant tensile force is applied by the spring elasticity of 7.

  And in the seismic isolation floor structure B of this embodiment comprised in this way, as shown in FIG. 1, the restoring force F required for the seismic isolation floor main-body part 2 is provided by providing the movable pulley 9 and the wire 10. As shown in FIG. In order to act, a constant load spring 7 having a spring elastic force of F / 2 may be prepared. For this reason, the constant load spring 7 with a small capacity is sufficient, and the entire restoration mechanism 6 and the seismic isolation floor structure B become compact.

  Therefore, in the seismic isolation floor structure B of the present embodiment, by constructing the restoring mechanism 6 using the movable pulley 9, the excessive displacement of the seismic isolation floor main body (base isolation floor) 2 is suppressed and displaced. A force (load) F required to restore the base-isolated floor main body 2 to the original position can be applied by the spring elastic force F / 2 of the constant load spring 7 smaller than that. Thereby, compared with the past, the constant load spring 7 can be made small, and it becomes possible to make a spring installation space compact.

  Therefore, according to the seismic isolation floor structure B of the present embodiment, it is possible to reduce the number of installation of the restoring mechanisms 6 (constant load springs 7) and to make the installation space compact while ensuring seismic isolation performance. It is possible to eliminate the inconvenience that the constant load spring 7 obstructs the passage and the usability of the floor is deteriorated.

  Next, with reference to FIG. 2, the seismic isolation floor structure which concerns on 2nd Embodiment of this invention is demonstrated. In addition, the same code | symbol is attached | subjected and demonstrated about the structure similar to the conventional seismic isolation floor structure A shown in FIG. 7, and the seismic isolation floor structure B of 1st Embodiment shown in FIG.

  As shown in FIG. 2 (and FIG. 1 and FIG. 7), the seismic isolation floor structure C of the present embodiment is a seismic isolation floor main body 2 on which the seismic isolation object 1 is mounted, as in the first embodiment. The support part 3 that slidably supports the base isolation floor main body 2 via the sliding material 4 and the excessive displacement of the base isolation floor main body 2 are suppressed, and the displaced base isolation floor main body 2 is brought into the original position. And a restoration mechanism 12 for restoration.

  On the other hand, the restoration mechanism 12 of the present embodiment is connected to a constant load spring (restoration spring) 7 provided integrally with the support portion 3 and the seismic isolation floor main body portion 2 via a connecting portion 8 such as a wire or a bar. The support section 3 is driven via a movable pulley 9 provided to follow the base isolation floor main body section 2 and a connecting member 13 such as a wire or a bar connected to a fixed point 11 fixed to the support section 3. The fixed pulley 14 fixedly supported on the support portion 3 and one end 10a are connected to the constant load spring 7 and the other end 10b is connected to the seismic isolation floor main body portion 2, respectively. It comprises a wire (cord) 10 wound around a moving pulley 9 and a fixed pulley 14 in a state where a certain tensile force is applied.

  And in the seismic isolation floor structure C of this embodiment comprised in this way, as shown in FIG. 2, it is required for the seismic isolation floor main-body part 2 by providing the movable pulley 9, the fixed pulley 14, and the wire 10. As shown in FIG. In order to apply the restoring force F, a constant load spring 7 having a spring elastic force of F / 3 may be prepared. For this reason, the constant load spring 7 having a smaller capacity than that of the first embodiment is sufficient, and the entire restoration mechanism 12 and the seismic isolation floor structure C become compact.

  Therefore, in the seismic isolation floor structure C of this embodiment, an excessive displacement of the base isolation floor main body (base isolation floor) 2 is suppressed by configuring the restoration mechanism 12 using the movable pulley 9 and the fixed pulley 14. At the same time, the force (load) F required to restore the displaced base-isolated floor main body 2 to the original position can be applied by the spring elastic force F / 3 of the constant load spring 7 smaller than that. . Thereby, compared with the past, the constant load spring 7 can be made small, and it becomes possible to make a spring installation space compact.

  Therefore, according to the seismic isolation floor structure C of the present embodiment, it is possible to reduce the number of the restoring mechanisms 12 (constant load springs 7) to be installed and to make the installation space compact while ensuring the seismic isolation performance. Thus, it is possible to eliminate the inconvenience that the constant load spring 7 obstructs the passage and the usability of the floor is deteriorated.

  Next, with reference to FIG. 3, the seismic isolation floor structure which concerns on 3rd Embodiment of this invention is demonstrated. In addition, the same code | symbol is attached | subjected about the structure similar to the conventional seismic isolation floor structure A shown in FIG. 7, and the seismic isolation floor structures B and C of 1st, 2nd embodiment shown in FIG. 1, FIG. Give an explanation.

  As shown in FIG. 3 (and FIG. 1, FIG. 2, FIG. 7), the seismic isolation floor structure D of this embodiment is similar to the first and second embodiments. The seismic floor main body 2, the support 3 that slidably supports the seismic isolation floor main body 2 via the sliding material 4, and an excessive displacement of the base isolation floor main body 2 are suppressed and the displaced base isolation floor main body And a restoring mechanism 15 for restoring the part 2 to the original position.

  On the other hand, the restoring mechanism 15 of the present embodiment is connected to the constant load spring (restoring spring) 7 provided integrally with the support portion 3 and the seismic isolation floor main body portion 2 via a connecting portion 8 such as a wire or a bar. , Supported via two movable pulleys 9 and 16 provided to follow the seismic isolation floor main body 2 and a connecting member 13 such as a wire or a bar connected to a fixed point 17 fixed to the support 3 A fixed pulley 14 fixed and supported on the support portion 3 so as to be driven by the portion 3, one end 10 a connected to the constant load spring 7, and the other end 10 b connected to the support portion 3 via the fixed point 11, respectively. A wire pulley (winding body) 10 wound around a moving pulley 9, a fixed pulley 14, and a moving pulley 16 sequentially from the constant load spring 7 in a state in which a constant tensile force is applied by the spring elasticity of the load spring 7. Has been.

  And in the seismic isolation floor structure D of this embodiment comprised in this way, as shown in FIG. 3, the seismic isolation floor main-body part 2 is equipped with the movable pulleys 9 and 16, the fixed pulley 14, and the wire 10. As shown in FIG. In order to apply the necessary restoring force F, a constant load spring 7 having a spring elastic force of F / 4 may be prepared. For this reason, the constant load spring 7 having a smaller capacity than that in the first and second embodiments is sufficient, and the entire restoration mechanism 15 and, in turn, the seismic isolation floor structure D becomes compact.

  Therefore, in the seismic isolation floor structure D of this embodiment, by constructing the restoring mechanism 15 using the movable pulleys 9 and 16 and the fixed pulley 14, the excessive displacement of the base isolation floor main body (base isolation floor) 2 is achieved. The force (load) F required to restore the displaced base-isolated floor main body 2 to the original position can be applied by the spring elastic force F / 4 of the constant load spring 7 smaller than that. become. Thereby, compared with the past, the constant load spring 7 can be made small, and it becomes possible to make a spring installation space compact.

  Therefore, according to the seismic isolation floor structure D of the present embodiment, it is possible to reduce the number of installation of the restoring mechanisms 15 (constant load springs 7) and to make the installation space compact while ensuring the seismic isolation performance. Thus, it is possible to eliminate the inconvenience that the constant load spring 7 obstructs the passage and the usability of the floor is deteriorated.

  Next, with reference to FIG. 4, the seismic isolation floor structure which concerns on 4th Embodiment of this invention is demonstrated. In addition, the same code | symbol is attached | subjected about the structure similar to the conventional seismic isolation floor structure A shown in FIG. 7, and the seismic isolation floor structures B, C, and D of 1st-3rd embodiment shown in FIGS. And explain.

  As shown in FIG. 4 (and FIG. 1 to FIG. 3 and FIG. 7), the seismic isolation floor structure E of the present embodiment has the seismic isolation object 1 mounted thereon as in the first, second, and third embodiments. The seismic isolation floor main body 2, the support 3 that slidably supports the base isolation floor main body 2 via the sliding material 4, and the displacement of the seismic isolation floor main body 2 is suppressed. And a restoring mechanism 18 for restoring the seismic floor main body 2 to the original position.

  On the other hand, the restoration mechanism 18 of the present embodiment is connected to the constant load spring (restoration spring) 7 provided integrally with the support portion 3 and the seismic isolation floor main body portion 2 via the connecting portion 19. A moving pulley (first moving pulley) 9 provided to follow the portion 2, one end 10 a is connected to the constant load spring 7, and the other end 10 b is connected to the support portion 3 via a fixed point 11, respectively. A wire (cord) 10 wound around a moving pulley 9 in a state where a certain tensile force is applied by the spring elasticity of the load spring 7 is provided.

  Further, in the restoration mechanism 18 of the present embodiment, the connecting portion 19 includes a second moving pulley (other moving pulley) 20 that is directly or indirectly supported by the base isolation floor main body portion 2 and one end 21a. The movable pulley 9 includes a second wire (another cable body) 21 provided by connecting the other end 21b to the support portion 3 via the fixed point 11.

  Further, the connecting portion 19 has a third wire (other cord) 22 provided by connecting one end 22a to the second movable pulley 20 and the other end 22b to the support portion 3 via the fixing point 11. And a third moving pulley (other moving pulley) 24 integrally connected to the seismic isolation floor main body 2 through a connecting member 23 such as a wire or a bar. I have.

  That is, the restoration mechanism 18 of the present embodiment is configured by connecting a plurality of movable pulleys 9, 20, 24 and interposed between the constant load spring 7 and the seismic isolation floor body 2.

  And in the seismic isolation floor structure E of this embodiment comprised in this way, as shown in FIG. 4, by providing the movable pulleys 9, 20, and 24 and the wires 10, 21, and 22, the base isolation floor main-body part is provided. In order to apply the necessary restoring force F to 2, a constant load spring 7 having a spring elastic force of F / 8 may be prepared. For this reason, the constant load spring 7 having a smaller capacity than that of the first to third embodiments is sufficient, and the entire restoration mechanism 18 and the seismic isolation floor structure E become compact.

  Therefore, in the base isolation floor structure E of the present embodiment, it is necessary to suppress the excessive displacement of the base isolation floor main body (base isolation floor) 2 and to restore the displaced base isolation floor main body 2 to the original position. A large force (load) F can be applied by the spring elastic force F / 8 of the constant load spring 7 smaller than that. Thereby, compared with the past, the constant load spring 7 can be made small, and it becomes possible to make a spring installation space compact.

  Therefore, according to the seismic isolation floor structure E of the present embodiment, it is possible to reduce the number of installation of the restoring mechanisms 18 (constant load springs 7) and to make the installation space compact while ensuring the seismic isolation performance. Thus, it is possible to eliminate the inconvenience that the constant load spring 7 obstructs the passage and the usability of the floor is deteriorated.

  The first to fourth embodiments of the seismic isolation floor structure according to the present invention have been described above. However, the present invention is not limited to the first to fourth embodiments described above, and does not depart from the spirit of the present invention. It can be changed as appropriate.

  For example, as described above, in the base-isolated floor structure according to the present invention, when a fixed pulley and a moving pulley are combined or the number of the moving pulleys is increased, the force required for the constant load spring 7 is F / 3, F / 4 ... and can be reduced sequentially according to the number of moving pulleys. For this reason, it is not always necessary to configure the restoring mechanism by limiting to the number of moving pulleys and fixed pulleys shown in the first to fourth embodiments.

  For example, as shown in FIGS. 5 and 6, the support portion 3 is constituted by a floor member 3 a and a wall member 3 b, the seismic isolation floor main body portion 2 is installed on the floor member 3 a of the support portion 3, and the constant load spring 7 May be integrally connected to the wall member 3b of the support portion 3 to constitute the restoring mechanism 25. In this case, one end 10a of the wire (cord) 10 is connected to the constant load spring 7 attached to the wall member 3b, and the other end 10b is connected to the fixed point 11 attached to the wall member 3b. Wrap around the moving pulley 9. Further, a wire (cord) 26 having one end 26 a connected to the movable pulley 9 and the other end 26 b connected to the base isolation floor main body 2 is wound around the fixed pulley 27.

  And if the restoration mechanism 25 of the seismic isolation floor structure F is configured in this way, in order to cause the necessary restoring force F to act on the seismic isolation floor main body 2 as in the case of the above-described embodiment, F / 2 A constant load spring 7 having a spring elastic force may be prepared. In addition to this, since at least the constant load spring 7 is attached to the wall member 3b, it is possible to make the entire restoration mechanism 25, and hence the seismic isolation floor structure F, more compact.

1 Seismic Isolation Target 2 Seismic Isolation Floor Body (Seismic Isolation Floor)
3 Support part 3a Floor member 3b Wall member 4 Sliding material 5 Constant load spring (restoration spring, conventional restoration mechanism)
6 Restoration mechanism 7 Constant load spring (Restoration spring)
8 Connecting part 9 Moving pulley 10 Wire (Rope)
10a one end 10b other end 11 fixed point 12 restoring mechanism 13 connecting member 14 fixed pulley 15 restoring mechanism 16 moving pulley 17 fixed point 18 restoring mechanism 19 connecting part 20 other moving pulley 21 wire (other cords)
21a One end 21b The other end 22 Wire (other cords)
22a one end 22b other end 23 connecting member 24 other moving pulley 25 restoring mechanism 26 wire (cord)
26a One end 26b The other end 27 Fixed pulley A Conventional base-isolated floor structure B Base-isolated floor structure C Base-isolated floor structure D Base-isolated floor structure E Base-isolated floor structure

Claims (4)

A seismic isolation floor main body on which the seismic isolation object is mounted;
The seismic isolation floor main body is installed via a sliding material, and a support part that slidably supports the base isolation floor main body,
A restoring mechanism for connecting the support portion and the base isolation floor main body portion to suppress an excessive displacement of the base isolation floor main body portion and restoring the displaced base isolation floor main body portion to an original position; With
A constant load spring provided integrally with the support;
A movable pulley connected to the base isolation floor main body portion via a connecting portion and provided to follow the base isolation floor main body portion;
One end is connected to the constant load spring, the other end is connected to the support portion, and a cord body wound around the movable pulley in a state where a constant tensile force is applied by spring elasticity of the constant load spring is provided. A base-isolated floor structure characterized by being constructed. In the base-isolated floor structure according to claim 1,
The connecting portion is at least one other moving pulley supported directly or indirectly by the base isolation floor main body portion, one end to the moving pulley or the other moving pulley, and the other end to the support portion. A base-isolated floor structure comprising at least one other cable body connected and provided. A seismic isolation floor main body on which the seismic isolation object is mounted;
The seismic isolation floor main body is installed via a sliding material, and a support part that slidably supports the base isolation floor main body,
A restoring mechanism for connecting the support portion and the base isolation floor main body portion to suppress an excessive displacement of the base isolation floor main body portion and restoring the displaced base isolation floor main body portion to an original position; With
A constant load spring provided integrally with the support;
A movable pulley connected to the base isolation floor main body portion via a connecting portion and provided to follow the base isolation floor main body portion;
A fixed pulley supported and fixed to the support portion so as to follow the support portion;
One end is connected to the constant load spring, the other end is connected to the base-isolated floor main body part or the support part, and the movable pulley and the fixed pulley are in a state in which a constant tensile force is applied by spring elasticity of the constant load spring. A base-isolated floor structure characterized by comprising a cable body wound around a cable. In the base-isolated floor structure as described in any one of Claims 1-3,
The support portion is composed of a floor member and a wall member,
The seismic isolation floor body is installed on the floor member of the support part,
A base-isolated floor structure in which at least a constant load spring of the restoring mechanism is provided integrally connected to a wall member of the support portion.

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