JP6423628B2 - Building basic structure - Google Patents

Description

  The present invention relates to a basic structure of a building in which a low-rise structure portion is added to a high-rise structure portion.

  Various foundation types such as direct foundation, pile foundation and piled raft foundation are adopted for the building. For example, Patent Literature 1 discloses a pile foundation that is formed of a pile that integrally has a footing on an upper portion and supports a building load.

  In general, a pile foundation can be expected to have a higher vertical bearing capacity than a direct foundation or a piled raft foundation, so a heavy structure is often supported by a pile foundation and a light structure is often supported by a direct foundation or a piled raft foundation.

  Here, in a building where a low-rise structure is added to a high-rise structure, the high-level structure, which is a heavy structure, is supported by a pile foundation, and the low-rise structure, which is a light structure, is directly supported by a foundation, Because the horizontal resistance stiffness of the pile foundation is smaller than the horizontal resistance stiffness of the direct foundation, the stiffness of the entire building at the foundation level is located closer to the low-rise structure. On the other hand, since the high-rise structure portion is heavier than the low-rise structure portion, the center of gravity of the entire building at the foundation level is located closer to the high-rise structure portion. Thereby, there is a concern that the rigid center and the center of gravity of the entire building in the horizontal direction are shifted, and the building is twisted.

JP 2003-41602 A

  This invention considers the fact which concerns, and makes it a subject to suppress the twist deformation | transformation which arises in a building.

  The invention according to the first aspect includes a foundation structure for a building that supports a building having a high-rise structure portion and a low-rise structure portion that is provided alongside the high-rise structure portion, the first foundation that supports the high-rise structure portion, and the low-rise structure. And a second foundation that supports the portion and has a horizontal resistance rigidity at a foundation level lower than that of the first foundation.

  In the first aspect of the invention, the high-rise structure portion is supported by the first foundation, and the low-rise structure portion that is lighter than the high-rise structure portion is supported by the second foundation having a lower horizontal resistance rigidity at the foundation level than the first foundation. It is possible to locate both the rigid center and the center of gravity of the entire building at the foundation level closer to the high-rise structure. Thereby, the shift | offset | difference of the rigid center and the gravity center of the whole building in a foundation level can be made small, or it can suppress the twist deformation | transformation which arises in a building.

  The invention of the second aspect is the building foundation structure of the first aspect, wherein the first foundation is constituted by a direct foundation or a piled raft foundation, and the second foundation is constituted by a pile foundation.

  In the invention of the second aspect, the direct foundation or the piled raft foundation is higher in the horizontal resistance rigidity and the horizontal strength at the foundation level at the time of the earthquake than the pile foundation. Therefore, by using the first foundation as a direct foundation or a piled raft foundation and the second foundation as a pile foundation, the horizontal resistance rigidity of the first foundation can be increased at the foundation level than the second foundation.

  According to the third aspect of the present invention, in the basic structure of the building of the first or second aspect, the height of the bottom surface of the low-rise structure portion is higher than the bottom surface of the high-rise structure portion.

  In the invention of the third aspect, the height of the bottom surface of the low-rise structure portion is made higher than the bottom surface of the high-rise structure portion, so that the lower portion of the high-rise structure portion (the high-rise structure portion protruding downward from the bottom surface of the low-rise structure portion) The first foundation at the foundation level by the passive resistance force of the front or back surface of the portion) and the frictional resistance force of the side surface of the lower portion of the high-rise structure portion (the portion of the high-rise structure portion protruding downward from the bottom surface of the low-rise structure portion) Can increase the horizontal resistance.

  Thereby, for example, when the difference in weight between the high-rise structure portion and the low-rise structure portion is large, and the difference between the horizontal force transmitted from the high-rise structure portion to the first foundation and the horizontal force transmitted from the low-rise structure portion to the second foundation is large. In the basic level, the difference between the horizontal force transmitted from the high-rise structure portion to the first foundation and the horizontal resistance force of the first foundation, the horizontal force transmitted from the low-rise structure portion to the second foundation, and the first Since the value of the difference from the horizontal resistance force of the two foundations can be set to a close value or an equal value, the torsional deformation generated in the building can be further suppressed.

  Since this invention was set as the said structure, the twist deformation | transformation which arises in a building can be suppressed.

It is an elevation view which shows the building which concerns on embodiment of this invention. It is an elevation view which shows the building which concerns on embodiment of this invention. It is an elevation view which shows the building which concerns on embodiment of this invention. It is an elevation view which shows the variation of the building which concerns on embodiment of this invention. It is an elevation view which shows the variation of the building which concerns on embodiment of this invention.

  Embodiments of the present invention will be described with reference to the drawings. First, the foundation structure of the building which concerns on embodiment of this invention is demonstrated.

  In the elevation view of FIG. 1, a building foundation structure 12 of the present embodiment that supports a reinforced concrete building 10 is shown. The building 10 is supported on a soft ground 14 as a ground via a building basic structure 12.

  The building 10 includes a low-rise structure portion 16 and a high-rise structure portion 18 in which the height of the ground portion is higher than that of the low-rise structure portion 16. The low-rise structure part 16 and the high-rise structure part 18 are provided side by side and constructed integrally. Further, the height of the bottom surface 20 of the low-layer structure portion 16 is higher than the height of the bottom surface 22 of the high-layer structure portion 18.

  As described above, the height of the high-rise structure portion 18 is higher than that of the low-rise structure portion 16, and the depth of the bottom surface 20 of the low-rise structure portion 16 is shallower than the bottom surface 22 of the high-rise structure portion 18 in the underground portion. The building volume of the high-rise structure 18 is larger than that of the structure 16. Thereby, the building weight of the high-rise structure portion 18 is heavier than that of the low-rise structure portion 16.

  The high-rise structure portion 18 is supported by a piled raft foundation 28 as a first foundation that is configured by directly attaching a plurality of piles 26 to the foundation 24, and the low-rise structure portion 16 is a second structure constituted by a plurality of piles 30. It is supported by a pile foundation 32 as a foundation.

  The pile foundation 32 has a lower horizontal resistance rigidity at the foundation level than the piled raft foundation 28. Here, the “basic level” means a level near the bottom surfaces 22 and 20 of the high-layer structure 18 and the low-layer structure 16. For example, in the case of a direct foundation, the level near the height of the sliding surface of this direct foundation, in the case of a pile foundation, the level near the height of the pile head of the pile that constitutes this pile foundation, the piled raft foundation In this case, the level near the height of the sliding surface of the direct foundation and the pile head of the pile constituting the piled raft foundation is the foundation level. In the case of the present embodiment, the level near the height of the pile head of the pile 30 constituting the pile foundation 32 and the sliding surface of the direct foundation 24 constituting the piled raft foundation 28 is the foundation level.

  Next, operations and effects of the building foundation structure according to the embodiment of the present invention will be described.

  In the building foundation structure 12 of the present embodiment, as shown in FIG. 1, the high-rise structure portion 18 is supported by a piled raft foundation 28 as a first foundation, and the low-rise structure portion 16 is supported by a pile foundation 32 as a second foundation. By supporting, the building 10 can be constructed on the soft ground 14.

  In addition, the direct foundation or piled raft foundation has greater horizontal resistance rigidity and horizontal strength at the foundation level at the time of the earthquake than the pile foundation. Therefore, by setting the first foundation as the piled raft foundation 28 and the second foundation as the pile foundation 32, the horizontal resistance rigidity of the first foundation can be made larger than the second foundation at the foundation level.

  Furthermore, the high-rise structure portion 18 is supported by the piled raft foundation 28, and the low-rise structure portion 16 having a lighter building weight than the high-rise structure portion 18 is supported by the pile foundation 32 having a lower horizontal resistance rigidity at the foundation level than the piled raft foundation 28. Thus, both the rigidity and the center of gravity of the entire building 10 at the foundation level can be positioned closer to the high-rise structure portion 18. Thereby, the shift | offset | difference of the rigid center and the gravity center of the whole building 10 in a foundation level can be made small or eliminated, and the twist deformation | transformation which arises in the building 10 can be suppressed.

  Further, the height of the bottom surface 20 of the low-layer structure portion 16 is made higher than the bottom surface 22 of the high-layer structure portion 18, thereby lowering the lower portion 34 of the high-layer structure portion 18 (the high layer protruding downward from the bottom surface 20 of the low-layer structure portion 16. The passive resistance force that the front surface 36 or the back surface 38 of the structure portion 18 receives from the soft ground 14, and the lower portion 34 of the high-rise structure portion (the portion of the high-rise structure portion 18 that projects downward from the bottom surface 20 of the low-rise structure portion 16). The lateral resistance force of the piled raft foundation 28 at the foundation level can be apparently increased by the frictional resistance force received by the side surface 40 from the soft ground 14.

  Thereby, for example, when the high-rise structure 18 is a super-high-rise, the height difference between the high-rise structure 18 and the low-rise structure 16 is large, that is, the weight difference is large, and is transmitted from the high-rise structure 18 to the piled raft foundation 28. Difference between the horizontal force transmitted and the horizontal force transmitted from the low-rise structure portion 16 to the pile foundation 32 (horizontal force transmitted from the high-rise structure portion 18 to the piled raft foundation 28> transmitted from the low-rise structure portion 16 to the pile foundation 32 In the case of horizontal force), at the foundation level, the difference between the horizontal force transmitted from the high-rise structure 18 to the piled raft foundation 28 and the horizontal resistance force of the piled raft foundation 28 and the pile from the low-rise structure 16 Since the value of the difference between the horizontal force transmitted to the foundation 32 and the horizontal resistance force of the pile foundation 32 can be a close value or an equal value, the torsional deformation generated in the building 10 is further suppressed. Rukoto can.

  Further, the height of the bottom surface 20 of the low-rise structure portion 16 is set higher than the bottom surface 22 of the high-rise structure portion 18, thereby constructing the construction period for constructing the ground portion of the low-rise structure portion 16 and the underground portion of the low-rise structure portion 16. The difference in work period can be reduced or eliminated, and the low-layer structure portion 16 can be constructed efficiently. Moreover, the amount of ground excavation for constructing the underground part of the low-rise structure part 16 can be reduced.

  The embodiment of the present invention has been described above.

  In the present embodiment, an example in which the first foundation supporting the high-rise structure portion 18 is a piled raft foundation 28 and the second foundation is a pile foundation 32 is shown, but the horizontal resistance rigidity at the foundation level is higher than that of the first foundation. However, if the second foundation becomes smaller, other types of foundations may be used for the first foundation and the second foundation. For example, the first foundation may be a direct foundation and the second foundation may be a pile foundation. Alternatively, the first foundation may be a direct foundation and the second foundation may be a piled raft foundation. Further, the first foundation may be a piled raft foundation and the second foundation may be a pile foundation. Alternatively, the first foundation may be a piled raft foundation, and the second foundation may be a piled raft foundation having a lower horizontal resistance rigidity at the foundation level than the first foundation. Moreover, it is good also considering the 1st foundation as the pile foundation comprised by the pile head rigid joint pile, and making the 2nd foundation the pile foundation comprised by the pile head pin joint pile. Moreover, it is good also considering the 1st foundation as the pile foundation comprised by the pile head rigid joining pile, and the 2nd foundation as the pile foundation comprised by the pile head semi-rigid joining pile. Moreover, it is good also considering the 1st foundation as the pile foundation comprised by the pile, and the 2nd foundation as the pile foundation comprised by the pile with a smaller pile diameter than the pile of the 1st foundation.

  When the first foundation is directly used as the foundation 42, the high-rise structure 18 is mounted on the support layer 46 formed below the soft ground 14 like the building foundation structure 44 shown in the elevation view of FIG. Alternatively, the high-rise structure 18 may be placed on the ground improvement body 50 constructed in the soft ground 14 like the building foundation structure 48 shown in the elevation view of FIG. Also good.

  As shown in FIG. 2, even when the height of the bottom surface 20 of the low-rise structure portion 16 is higher than the bottom surface 22 of the high-rise structure portion 18, the low-rise structure portion 16 can be obtained by using the second foundation as the pile foundation 32. Can be supported by the support layer 46.

  Moreover, in this embodiment, although the high-rise structure part 18 was supported by the piled raft foundation 28 as a 1st foundation, and the low-rise structure part 16 was supported by the pile foundation 32 as a 2nd foundation, in the foundation level, it showed. If the rigid center and the center of gravity of the entire building 10 are positioned closer to the high-rise structure portion 18 and the deviation of the rigid center and the center of gravity of the entire building 10 at the foundation level can be reduced or eliminated, the high-rise structure portion 18 and the low-rise structure portion 16 And the boundary between the first foundation and the second foundation do not necessarily coincide with each other. For example, a part of the high-rise structure part 18 may be supported by the second foundation, or a part of the low-rise structure part 16 may be supported by the first foundation.

  Furthermore, in this embodiment, although the example which used the ground as the soft ground 14 was shown, the ground which has another ground strength may be sufficient. That is, the building foundation structure 12 of this embodiment can be applied to buildings built on the ground of various ground strengths.

  Moreover, in this embodiment, although the example which made the height of the bottom face 20 of the low-rise structure part 16 higher than the bottom face 22 of the high-rise structure part 18 was shown, like the building 52 shown in the elevation view of FIG. The bottom surface 22 of the structure portion 18 and the bottom surface 56 of the low-rise structure portion 54 may have the same height, or the building 58 shown in the elevation view of FIG. It may be a building where the bottom surface 62 of the low-rise structure part 60 is low.

  Furthermore, in this embodiment, although the example which made the height of the ground part of the high-rise structure part 18 higher than the ground part of the low-rise structure part 16 was shown, the torsional deformation of a building is a building of a high-rise structure part and a low-rise structure part. Since the higher the difference in weight, the more likely it is to occur, the application of the building foundation structure 12 of the present invention is particularly effective when the high-rise structure portion 18 becomes super high (the building weights of the high-rise structure portion and the low-rise structure portion differ greatly). It becomes effective.

  Moreover, you may construct | assemble the underground part of the high-rise structure part 18 by the reverse driving method. In this way, when the ground portion of the high-rise structure portion 18 is high, the underground portion of the high-rise structure portion 18 can be formed deeply in accordance with the construction period for constructing the ground portion of the high-rise structure portion 18. Thereby, for example, as shown in FIG. 2, even in the case of forming a deep underground part to reach the support layer 46 formed below the soft ground 14, the construction period for constructing the ground part of the high-rise structure part 18, The difference in construction period for constructing the underground portion of the high-rise structure portion 18 can be reduced or eliminated.

  Furthermore, in this embodiment, the example which made the building 10 reinforced concrete structure was shown, but the building 10 supported by the foundation structure 12 of the building of this embodiment is reinforced concrete structure, steel structure, steel frame reinforced concrete structure, CFT structure ( Concrete-Filled Steel Tube (filled steel tube concrete structure), a mixed structure thereof, and the like, a building of various structures and scales may be used, and a new building or a renovation building may be used.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment at all, Of course, in the range which does not deviate from the summary of this invention, it can implement in a various aspect.

10, 52, 58 Building 12, 44, 48 Building foundation structure 16, 54, 60 Low-rise structure 18 High-rise structure 20, 22, 56, 62 Bottom 28 Pile draft foundation 32 Pile foundation 42 Direct foundation

Claims (2)

In the foundation structure of a building that supports a building having a high-rise structure portion and a low-rise structure portion provided alongside the high-rise structure portion,
A first foundation constituted by a direct foundation or a piled raft foundation that supports the high-rise structure part on soft ground;
A second foundation constituted by a pile foundation that supports the low-rise structure part on the soft ground and has a lower horizontal rigidity at a foundation level than the first foundation;
Basic structure of the building to have a.   The foundation structure of a building according to claim 1, wherein a height of the bottom surface of the low-rise structure portion is higher than a bottom surface of the high-rise structure portion.

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