JP2011132726A - Foundation structure and base isolation structure equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce breakage and damages to a concrete foundation resulting from ground deformation, while securing water cut-off performance. <P>SOLUTION: Adjacent foundation slabs 20 are connected to each other with concrete connecting bodies 22 smaller in rigidity than these foundation slabs 20. The joint space 28 between the adjacent foundation slabs 20 are embedded with the concrete connecting bodies 22, inhibiting the intrusion of water from the ground 18 on the support surface 20A of the concrete connecting bodies. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a foundation structure and a seismic isolation structure including the foundation structure.

  As a basic structure of a structure, a basic beam structure and a basic slab structure are known. For example, in the foundation slab structure, the upper structure is supported by the foundation slab constructed on the ground. In addition, a plurality of the upper structures provided side by side may be supported by one basic slab.

  Here, if the size of the foundation slab increases as the upper structure becomes larger or longer, the foundation slab may be damaged or damaged due to ground deformation such as an earthquake or non-uniform subsidence (consolidation subsidence, immediate subsidence, etc.). is there. In particular, if a foundation slab near a column or seismic isolation device is damaged or damaged, the effect on the superstructure increases.

  As a countermeasure, it is conceivable to divide the basic slab into a plurality of sections and connect adjacent sections so that they can be relatively displaced by an expansion joint. In this case, ground deformation due to earthquakes and unsettled settlement is absorbed by the expansion joint, so that the foundation slab is prevented from being damaged or damaged. However, the expansion joint does not have a water-stop function, and water-stopping against spring water is a problem.

  On the other hand, Patent Document 1 proposes a foundation method that suppresses damage and damage to the foundation beam due to uneven settlement due to the difference in weight between the high-rise building and the low-rise building. In this foundation method, a slit is provided between the foundation beam that supports the high-rise building and the foundation beam that supports the low-rise building, and after the high-rise building and the low-rise building are sufficiently submerged, concrete is placed in the slit, The foundation beam that supports the high-rise building and the foundation beam that supports the low-rise building are combined. In this foundation construction method, concrete is placed in the slit, so that the water stoppage against the spring water is ensured.

  However, in the basic construction method of Patent Document 1, the uneven settlement during construction is absorbed by the slits, and it is impossible to absorb ground deformation such as earthquakes and uneven settlements that occur after placing concrete in the slits. In other words, after placing concrete in the slit, the foundation beam may be damaged or damaged due to ground deformation such as an earthquake or uneven settlement.

JP-A-8-27809

  In view of the above facts, an object of the present invention is to reduce breakage and damage of a concrete foundation caused by ground deformation while ensuring water-stopping properties.

  The foundation structure according to claim 1 is constructed on the ground, connects a plurality of concrete foundations that support the upper structure and the adjacent concrete foundation, and is submerged from the ground to the support surface of the concrete foundation. And a connecting body having a rigidity lower than that of the concrete foundation.

  According to said structure, it is built on the ground and is equipped with the some concrete foundation which supports an upper structure. Adjacent concrete foundations are connected by a connecting body having lower rigidity than the concrete foundation. In addition, the connection body prevents water from entering from the ground to the support surface of the concrete foundation.

  Here, by connecting adjacent concrete foundations with a connecting body, stress such as shearing force is transmitted between the adjacent concrete foundations via the connecting body. Accordingly, since the vertical load of the upper structure is distributed and transmitted to each concrete foundation, the concentrated load on the specific concrete foundation is reduced. In addition, since the concrete foundations cooperate and resist against ground deformation such as earthquakes and uneven settlement, the destruction and damage of the concrete foundations are suppressed.

  Furthermore, the connection body has a smaller rigidity than the concrete foundation. Therefore, for example, when the ground deformation becomes excessive due to an unexpected earthquake or unsettled settlement, the connected body is deformed or broken prior to the concrete foundation. Thereby, since a ground deformation | transformation is absorbed, destruction of a concrete foundation is suppressed.

  As described above, in the present invention, by connecting adjacent concrete foundations with a joint body having a rigidity reduced intentionally, each concrete foundation resists the ground deformation within the assumption as a unit, but it is not expected. For ground deformation, the connecting body is deformed or destroyed prior to the concrete foundation, and the ground deformation is absorbed. Therefore, large-scale destruction of the concrete foundation is suppressed.

  A foundation structure according to a second aspect is the foundation structure according to the first aspect, wherein the coupling body is a concrete coupling body that blocks between adjacent concrete foundations.

  According to said structure, the connection body is made into the concrete connection body which plugs up between the adjacent concrete foundations. That is, the space between adjacent concrete foundations is filled with the concrete connection body. Therefore, it is possible to suppress water from the ground to the support surface of the concrete foundation with a simple structure.

  The foundation structure according to claim 3 is the foundation structure according to claim 2, wherein the thickness of the concrete connecting body is made thinner than that of the concrete foundation.

  According to said structure, the thickness of a concrete coupling body is made thinner than the thickness of a concrete foundation. That is, the rigidity of the concrete connection body is made smaller than that of the concrete foundation due to the thickness of the concrete connection body. Therefore, the rigidity of the concrete connection body can be made smaller than the rigidity of the concrete foundation with a simple structure.

  The foundation structure according to claim 4 is the foundation structure according to claim 2 or claim 3, wherein a drainage groove in which aggregates are spread is provided under the concrete connection body.

  According to said structure, the drainage groove | channel which spread the aggregate is provided under the concrete coupling body. This drainage groove drains rainwater or the like that accumulates in the space between adjacent concrete foundations, so that it is easy to construct a concrete connector.

  The foundation structure according to claim 5 is the foundation structure according to any one of claims 1 to 4, wherein a plurality of the upper structures are constructed on the concrete foundation, and the connection body is adjacent to the foundation structure. Between the upper structures.

  According to said structure, the some upper structure is constructed | assembled on the concrete foundation, and the connection body is located between these upper structures. That is, the connecting body is located in a portion where there is no column or seismic isolation device that directly supports the upper structure, and adjacent concrete foundations are connected at a position where the burden stress is relatively small. Therefore, since the required strength or the required breaking strength of the connection body is reduced, the structure of the connection body can be simplified. Furthermore, since there is no upper structure above the connection body, the construction of the connection body becomes easy.

  A foundation structure according to claim 6 is the foundation structure according to claim 1, wherein the connecting body connects the adjacent concrete foundations and partitions or closes a space between the concrete foundations. is there.

  According to said structure, the connection body is made into the steel connection body connected with the adjacent concrete foundation. The space between adjacent concrete foundations is partitioned or closed by this steel connection body. This prevents water from entering the support surface of the concrete foundation. In addition, the ground deformation is absorbed by deformation or fracture of the steel connection body in response to ground deformation such as an unexpected earthquake or uneven settlement. Therefore, large-scale destruction of the concrete foundation is suppressed.

  Furthermore, the energy absorption performance by hysteresis deformation can be improved by using low yield point steel or the like for the steel connection body.

  The seismic isolation structure according to claim 7 is the base structure according to any one of claims 1 to 6, an upper structure constructed on the foundation structure, the upper structure, and the concrete. A seismic isolation device provided between the base and supporting the upper structure.

  According to said structure, the upper structure is supported by the seismic isolation apparatus provided between the concrete foundation and the upper structure. Here, the adjacent concrete foundation is connected with the connection body whose rigidity is smaller than the said concrete foundation. Therefore, when the ground deformation becomes excessive due to an unexpected earthquake or uneven settlement, the connected body is deformed or destroyed prior to the concrete foundation, and the ground deformation is absorbed. Therefore, large-scale destruction of the concrete foundation is suppressed, and breakage and damage of the seismic isolation device that supports the upper structure are suppressed.

  Moreover, since the relative displacement of the adjacent concrete foundation at the time of ground deformation is absorbed by the horizontal deformation of the seismic isolation device, the upper structure does not follow this relative displacement. Therefore, even if the connection body is broken and the relative displacement amount of the adjacent concrete foundation increases, the external force acting on the upper structure does not increase. Therefore, breakage and damage of the upper structure are suppressed.

  Since this invention set it as said structure, it can reduce the failure | damage of the concrete foundation resulting from ground deformation, and damage, ensuring a water stop.

It is an elevation view which shows the seismic isolation structure provided with the foundation structure which concerns on 1st Embodiment of this invention. It is a top view which shows the seismic isolation structure provided with the foundation structure which concerns on 1st Embodiment. (A) And (B) is a vertical sectional view showing the basic structure concerning a 1st embodiment. (A) And (B) is a vertical sectional view showing a modification of a foundation structure concerning a 1st embodiment. (A) And (B) is a vertical sectional view showing a modification of a foundation structure concerning a 2nd embodiment of the present invention. It is an elevational view showing a modification of the foundation structure according to the first embodiment.

  Hereinafter, a basic structure according to an embodiment of the present invention will be described with reference to the drawings.

  First, the first embodiment will be described.

  The seismic isolation structure 10 is shown by FIG.1 and FIG.2. The seismic isolation structure 10 is provided between the foundation structure 12, the upper structure 14 constructed on the foundation structure 12, and the foundation structure 12 and the upper structure 14, and supports the upper structure 14. And a seismic device 16.

  The foundation structure 12 includes a plurality of foundation slabs (concrete foundations) 20 laid on the ground 18, and a concrete connection body (connection body) 22 that closes between adjacent foundation slabs 20. The foundation slab 20 is constructed in a seismic isolation layer formed by digging down the ground 18, and a pile 24 embedded in the ground 18 is connected thereto. A retaining wall 26 is erected on the outer periphery of the foundation slab 20. A seismic isolation device 16 that supports the upper structure 14 is installed on the support surface 20 </ b> A of the foundation slab 20.

  In this embodiment, a laminated rubber bearing is used as the seismic isolation device 16, but various seismic isolation devices such as a sliding bearing, an elastic sliding bearing, and a rolling bearing can be used.

  As shown in FIG. 2, each foundation slab 20 is constructed in a concrete placement area partitioned into a plurality (six in this embodiment). A groove-shaped joint space 28 is formed between adjacent foundation slabs 20, and a concrete connection body (connection body) 22 is provided in the joint space 28. In addition, the number and arrangement | positioning of the foundation slab 20 can be changed suitably.

  As shown in FIG. 3B, the concrete connector 22 is provided in the lower portion 28 </ b> B of the joint space 28, and the upper surface 22 </ b> A of the concrete connector 22 is lower than the support surface 20 </ b> A of the foundation slab 20. That is, the thickness of the concrete connector 22 is smaller than the thickness of the foundation slab 20, and the cross-sectional area of the concrete connector 22 is smaller than the cross-sectional area of the foundation slab 20. Thereby, the rigidity and fracture strength of the concrete connection body 22 are smaller than the foundation slab 20. In addition, the foundation slab 20 and the concrete connection body 22 are comprised with the concrete which has equivalent intensity | strength.

  Further, a groove 44 (upper portion 28 </ b> A of the joint space 28) is formed above the concrete connection body 22 by a step between the upper surface 22 </ b> A of the concrete connection body 22 and the support surface 20 </ b> A of the foundation slab 20. The groove 44 drains rainwater or the like accumulated on the support surface 20 </ b> A of the foundation slab 20. In addition, the groove | channel 44 is connected to the well-shaped pot place which is not shown in figure, and the waste_water | drain collected in the said pot place is pumped up with a pump.

  The adjacent foundation slab 20 and the concrete connector 22 are joined so as to transmit stress such as a shearing force by a joint bar 34 that is embedded across the foundation slab 20 and the concrete connector 22. The joint bars 34 respectively project from the end portions of the adjacent foundation slabs 20, and the end portions are overlapped in the concrete connector 22 (lap joint). Furthermore, the upper end reinforcement 36, the lower end reinforcement 38, and the reinforcement reinforcement 30 are embedded in the foundation slab 20 and the concrete coupling body 22. By this concrete connection body 22, the joint space 28 between the adjacent foundation slabs 20 is closed, and the spring water from the ground 18 is stopped so as not to be flooded into the support surface 20A of the foundation slab 20. .

  The joint bar 34 protruding from the end of the adjacent foundation slab 20 is not limited to a lap joint, and may be an empty lap joint that provides a gap between the ends of the joint bar 34 or the end of the joint bar 34. Moreover, it is good also as a splicing joint which piles up a splicing bar in each. Further, the ends of the joint bars 34 may be connected by a mechanical joint or the like.

  A drainage groove 40 extending along the concrete connection body 22 is provided below the concrete connection body 22. The drainage groove 40 is formed by excavating the ground 18 into a groove shape, and an aggregate 42 is spread inside. The drainage groove 40 drains rainwater and spring water accumulated in the joint space 28 before the concrete connector 22 is constructed (see FIG. 3A). Further, the aggregate 42 is laid so as to prevent the passage of rainwater and the like, but the viscous concrete or the like does not pass through, so that the aggregate 42 functions as a formwork of the concrete connector 22. As the aggregate 42, gravel, crushed sand, crushed stone, artificial aggregate, or the like can be used. Further, the drainage groove 40 is connected to the above-described pot place.

  Next, an example of a construction method for the foundation structure according to the first embodiment will be described.

  As shown in FIG. 2, after placing the upper reinforcement 36, the lower reinforcement 38, the reinforcing reinforcement 30, the joint reinforcement 34, etc. in the concrete placement area partitioned by the formwork, a plurality of concrete is placed. The basic slab 20 is constructed. The drain groove 40 and the like are formed in advance. Thereafter, concrete is placed in the lower portion of the joint space 28 formed between the adjacent foundation slabs 20 to construct the concrete connection body 22. Adjacent foundation slabs 20 are connected by this concrete connecting body 22 so that stress such as shearing force can be transmitted.

  Next, the operation of the foundation structure according to the first embodiment will be described.

  Adjacent foundation slabs 20 are connected to each other by a concrete connecting body 22 so that stress such as shearing force can be transmitted. Accordingly, since the vertical load of the upper structure 14 is distributed and transmitted to the foundation slab 20, the concentrated load on the specific foundation slab 20 is reduced. Therefore, cracks, cracks, etc. of the foundation slab 20 are suppressed.

  In addition, when ground deformation such as an earthquake or uneven settlement occurs, an external force such as an X direction or a Y direction acts on the foundation structure 12 and the adjacent foundation slab 20 is relatively displaced in the horizontal direction as shown in FIG. . Alternatively, as shown by an arrow shown in FIG. 3B, one of the adjacent foundation slabs 20 sinks, and a vertical displacement occurs between the adjacent foundation slabs 20. As a result, stress such as shearing force and bending moment is generated in the foundation slab 20. This stress is transmitted between the adjacent foundation slabs 20 through the concrete connector 22. That is, the adjacent foundation slab 20 cooperates and resists external force. Accordingly, the concentrated load on the specific foundation slab 20 is reduced, and cracks, cracks, etc. of the foundation slab 20 are suppressed.

Furthermore, the thickness of the concrete connector 22 is smaller than that of the foundation slab 20. That is, the concrete connecting body 22 is configured to have rigidity and fracture strength smaller than those of the foundation slab 20, and the concrete connecting body 22 is configured to break before the foundation slab 20. Therefore, when the ground deformation becomes excessive due to an unexpected large earthquake (for example, a ground motion exceeding the rarely occurring ground motion with a reproduction period of 500 years) or the like, the concrete connector 22 precedes the foundation slab 20. Destruction occurs. Thereby, the relative displacement amount of the adjacent foundation slab 20 becomes large, and the ground deformation is absorbed. Accordingly, not only cracks and cracks in the foundation slab 20 but also large-scale destruction of the foundation slab 20 is suppressed.
The ground deformation during construction is absorbed by the joint space 28. Therefore, cracks, cracks, large-scale destruction, etc. of the foundation slab 20 during and after construction are suppressed.

  As described above, in the foundation structure 12, the adjacent foundation slabs 20 are connected by the concrete connection body 22 whose rigidity and fracture strength are intentionally reduced, so that the foundation slabs 20 are integrated with each other for the assumed ground deformation. On the other hand, against the unexpected ground deformation, the concrete connecting body 22 is destroyed prior to the foundation slab 20, and the ground deformation is absorbed. Therefore, since large-scale destruction of the foundation slab 20 is suppressed, breakage and damage of the seismic isolation device 16 that supports the upper structure 14 are suppressed.

  Moreover, since the relative displacement of the adjacent foundation slab 20 is absorbed by the horizontal deformation of the seismic isolation device 16, the upper structure 14 does not follow the relative displacement of the adjacent foundation slab 20. Therefore, even if the concrete connection body 22 is destroyed and the relative displacement amount of the adjacent foundation slab 20 increases, the external force acting on the upper structure 14 does not increase. Therefore, breakage and damage of the upper structure 14 are suppressed.

  In particular, the foundation structure 12 according to the present embodiment is effective for a foundation slab having a large area (planar area). In the foundation slab, the seismic force generated as the area increases increases, and the difference in the arrival time of the seismic wave between the ends of the foundation slab increases, so that the foundation slab 20 is likely to break. is there.

  In addition to the above, since the joint space 28 formed between the adjacent foundation slabs 20 is filled with the concrete connecting body 22, inundation such as spring water is suppressed from the ground 18 to the support surface 20A of the foundation slab 20. The Accordingly, the water-stopping property is improved as compared with the conventional expansion joint.

  Furthermore, the simple structure of making the thickness of the concrete coupling body 22 smaller than that of the foundation slab 20 makes the rigidity and fracture strength of the concrete coupling body 22 smaller than that of the foundation slab 20. Therefore, the workability of the foundation structure 12 is improved. Moreover, since the concrete coupling body 22 and the foundation slab 20 can be comprised with the same concrete, cost reduction can be aimed at. Furthermore, the groove | channel 44 formed by the level | step difference between the upper surface 22A of the concrete coupling body 22 and the support surface 20A of the foundation slab 20 can be diverted as a drainage groove.

  As a countermeasure against cracking due to drying shrinkage of the foundation slab 20, after the foundation slab 20 is sufficiently dried and shrunk, concrete may be placed in the joint space 28 to construct the concrete connection body 22, or the joint space 28 may be constructed. A hydration activator or the like may be applied to the side wall (end surface of the foundation slab 20) to suppress cracks and cracks generated at the joint between the foundation slab 20 and the concrete connector 22.

  Next, a modification of the concrete connected body according to the first embodiment will be described.

  In 1st Embodiment, although the rigidity and fracture strength of the concrete coupling body 22 were made smaller than the foundation slab 20 with the thickness of the concrete coupling body 22, it is not restricted to this.

  For example, as shown in FIG. 4 (A), the concrete connection body 32 is made of concrete having a strength lower than that of the foundation slab 20, thereby reducing the rigidity and fracture strength of the concrete connection body 32 than that of the foundation slab 20. May be. For example, when the foundation slab 20 is ordinary concrete, the concrete connecting body 22 is made of low strength concrete such as lightweight concrete. Further, when the foundation slab 20 is high-strength concrete or fiber reinforced concrete, the concrete connecting body 22 is made of ordinary concrete, lightweight concrete, or the like.

  In the configuration shown in FIG. 4A, the thickness of the concrete connector 32 and the thickness of the foundation slab 20 can be made the same, and the space between the upper surface 32A of the concrete connector 32 and the support surface 20A of the foundation slab 20 can be made. Steps can be eliminated.

  In addition, even if the rigidity of the concrete coupling body 22 is made smaller than that of the foundation slab 20 by reducing the amount of reinforcement of the concrete coupling body 22 (upper end reinforcement 36, lower end reinforcement 38, reinforcement reinforcement 30 and the like) than that of the foundation slab 20. good.

  Further, as shown in FIG. 4B, the rigidity and fracture strength of the concrete connecting body 52 may be made smaller than that of the foundation slab 20 by forming a void hole 54 inside the concrete connecting body 52. In this case, even if the concrete strength of the concrete coupling body 32 and the foundation slab 20 is the same, the cross-sectional area of the concrete coupling body 52 is reduced, so that its rigidity and proof stress can be made smaller than those of the foundation slab 20. 4A and 4B, the drainage groove 40 is omitted.

  Next, a second embodiment will be described. In addition, the thing of the same structure as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits suitably and demonstrates.

  As shown in FIG. 5 (A), in the foundation structure 60 according to the second embodiment, a steel connection body (connection body) 62 is used instead of the concrete connection body 22 according to the first embodiment. The steel connector 62 is an H-shaped steel, and includes a web 62A and a flange 62B provided at an end of the web 62A. For the steel connector 62, ordinary steel (for example, SM490, SS400, etc.), low yield point steel (for example, LY225, etc.), or the like is used.

  The steel connector 62 is disposed between the adjacent foundation slabs 20 with the outer surface of the flange 62B overlapped with the end face of the foundation slab 20. On the outer surface of the flange 62B, a stud 64 is provided as a shearing force transmitting portion embedded in the foundation slab 20. The flanges 62 </ b> B are fixed to the foundation slab 20 by the studs 64, and the adjacent foundation slabs 20 are coupled by the steel coupling body 62 so that stress such as shearing force can be transmitted.

  In addition to the stud 64, an adhesive such as a deformed reinforcing bar or an epoxy resin may be used as the shearing force transmission unit. Moreover, it is desirable that the steel connector 62 is appropriately subjected to a rust prevention treatment.

  The plate thickness and material of the web 62 </ b> A of the steel connector 62 are set such that the rigidity is smaller than that of the basic slab 20. Further, the joint space 28 between the adjacent foundation slabs 20 is partitioned in the vertical direction (out-of-plane direction of the steel plate) by the web 62A so that the spring water from the ground 18 does not flood the support surface 20A of the foundation slab 20. Water has been stopped. The groove-like space 66 (the upper portion 28A of the joint space 28 partitioned by the web 62A) surrounded by the upper surface of the web 62A and the inner surface of the flange 62B drains rainwater and the like accumulated on the support surface 20A of the foundation slab 20. It can be used as a drain.

  In addition, the steel connection body 62 should just have the rigidity of the web 62A smaller than the basic | foundation slab 20, and may comprise the web 62A and the flange 62B with a different steel material. For example, the web 62A may be made of low yield point steel and the flange 62B may be made of plain steel.

  Next, the operation of the second embodiment will be described.

  Adjacent foundation slabs 20 are connected by a steel connector 62 so that stress such as shearing force can be transmitted. Accordingly, since the vertical load of the upper structure 14 is distributed and transmitted to the foundation slab 20, the concentrated load on the specific foundation slab 20 is reduced. Moreover, each foundation slab 20 cooperates and resists external forces, such as an earthquake. Therefore, the concentrated load with respect to the specific foundation slab 20 is reduced. Therefore, cracks, cracks, etc. of the foundation slab 20 are suppressed.

  Further, the rigidity and fracture strength of the web 62 </ b> A of the steel coupling body 62 are smaller than those of the basic slab 20. That is, the web 62 </ b> A is configured to be deformed or broken prior to the basic slab 20. Accordingly, when the ground deformation becomes excessive due to an unexpected large earthquake (for example, a ground motion exceeding the rarely occurring ground motion of 500 years), the web 62A is deformed in advance of the foundation slab 20. Or break. Thereby, the relative displacement amount of the adjacent foundation slab 20 becomes large, and the ground deformation is absorbed. Accordingly, not only cracks and cracks in the foundation slab 20 but also large-scale destruction of the foundation slab 20 is suppressed.

  In this way, in the foundation structure 60, each foundation slab can be prevented against the expected ground deformation by connecting the adjacent foundation slabs 20 with the steel coupling body 62 in which the rigidity and fracture strength of the web 62A are intentionally reduced. While 20 resists as a whole, the unexpected deformation of the ground deforms or breaks the web 62A of the steel connector 62 prior to the foundation slab 20, and absorbs the ground deformation. Therefore, since large-scale destruction of the foundation slab 20 is suppressed, breakage and damage of the seismic isolation device 16 that supports the upper structure 14 are suppressed.

  Moreover, since the relative displacement of the adjacent foundation slab 20 is absorbed by the horizontal deformation of the seismic isolation device 16 as described in the first embodiment, the upper structure 14 does not follow this relative displacement. Therefore, even if the web 62A of the steel connector 62 is deformed or broken, and the relative displacement amount of the adjacent foundation slab 20 increases, the external force acting on the upper structure 14 does not increase. Therefore, breakage and damage of the upper structure 14 are suppressed.

  Further, the joint space 28 between the adjacent foundation slabs 20 is partitioned in the vertical direction by the steel plate 72. Thereby, inundation such as spring water is suppressed from the ground 18 to the support surface 20 </ b> A of the foundation slab 20. Accordingly, the water-stopping property is improved as compared with the conventional expansion joint.

  Furthermore, by configuring the web 62A with a low yield point steel or the like, the energy absorption performance due to hysteresis deformation can be improved.

  In addition, in this embodiment, although the H-section steel was used as the steel coupling body 62, it is not restricted to this. For example, as shown in FIG. 5 (B), the adjacent foundation slabs 20 may be connected by a steel plate (steel connection body, connection body) 72 having rigidity smaller than that of the foundation slab 20.

  The steel plate 72 is fixed to the foundation slab 20 by embedding a stud 64 as a shearing force transmitting portion provided on the lower surface thereof in the foundation slab 20. The steel plate 72 closes the joint space 28 (space) between the adjacent foundation slabs 20 and suppresses inundation such as spring water from the ground 18 to the support surface 20A of the foundation slab 20.

  In the first and second embodiments, one upper structure 14 is constructed above the base structure 12, but the present invention is not limited to this. For example, as shown in FIG. 6, a plurality of (three buildings in FIG. 6) upper structures 74 may be constructed on the foundation structure 12. In this case, the seismic isolation device 16 that supports the upper structure 74 does not exist between the adjacent upper structures 74, and the vertical load borne by the foundation structure 12 is reduced. Therefore, the required strength or the required fracture strength of the concrete connection body 22 (or steel connection body 62) is reduced by positioning the concrete connection body 22 (or steel connection body 62) between the adjacent upper structures 74. be able to. Furthermore, since the upper structure 74 does not exist above the connection body, the construction of the concrete connection body 22 (or the steel connection body 62) becomes easy.

  In the configuration shown in FIG. 6, since the upper structure 14 does not straddle the adjacent foundation slab 20, even if the concrete connecting body 22 is broken and the relative displacement amount of the adjacent foundation slab 20 increases, the seismic isolation is achieved. Regardless of the presence or absence of the device 16, the external force acting on the upper structure 14 does not increase. That is, in the configuration shown in FIG. 6, the seismic isolation device 16 can be omitted and the upper structure 14 can be directly supported by the foundation slab 20.

  In the first and second embodiments, the foundation slab 20 has been described as an example. However, the present invention is not limited to this, and a mat slab or a foundation beam may be used. Moreover, 1st, 2nd embodiment is applicable to various foundation structures, such as a solid foundation, a cloth foundation, and a pile foundation.

  The first and second embodiments of the present invention have been described above. However, the present invention is not limited to such embodiments, and the first and second embodiments may be used in combination. Of course, various embodiments can be implemented without departing from the scope of the invention.

10 Base-isolated structure 12 Foundation structure 14 Upper structure 16 Base-isolation device 18 Ground 20 Foundation slab (concrete foundation)
20A Support surface 22 Concrete connection body (connection body)
28 Joint space (space)
32 Concrete connected body (Connected body)
40 Drainage groove 42 Aggregate 52 Concrete connection body (connection body)
62 Steel connector (connector)
72 Steel plates (steel connections, connections)
74 Superstructure

Claims (7)

A plurality of concrete foundations built on the ground and supporting the superstructure,
Connecting adjacent concrete foundations, preventing water from entering from the ground to the support surface of the concrete foundation, and a connected body having a smaller rigidity than the concrete foundation;
Basic structure with   The foundation structure according to claim 1, wherein the connection body is a concrete connection body that blocks between the adjacent concrete foundations.   The foundation structure according to claim 2, wherein a thickness of the concrete connection body is thinner than the concrete foundation.   The foundation structure of Claim 2 or Claim 3 which provided the drainage groove | channel which spread the aggregate under the said concrete connection body. A plurality of the superstructures are constructed on the concrete foundation;
The foundation structure according to any one of claims 1 to 4, wherein the connecting body is located between the adjacent upper structures.   The foundation structure according to claim 1, wherein the connection body is a steel connection body that connects adjacent concrete foundations and partitions or closes a space between the concrete foundations. The basic structure according to any one of claims 1 to 6,
An upper structure constructed on the foundation structure;
A seismic isolation device which is provided between the upper structure and the concrete foundation and supports the upper structure;
A seismic isolation structure.

Images