JP6166574B2 - Building design method - Google Patents

Description

  The present invention relates to a building design method.

  In a general building design method, after designing an upper building, a building foundation that supports the upper building is designed. A similar design method is used for the rebuilt building, and after the upper building is newly planned, the building foundation that supports the newly planned upper building is designed. Patent Document 1 discloses a building support structure in which an existing pile is reused. Here, the building foundation is designed using both the existing pile and the new pile so that the new building roof can be supported.

  However, it is difficult to construct new piles due to the fact that buried cultural assets and underground pipes are buried in the direct base of the planned upper building, and there are places where new piles can be constructed. When limited, it is not possible to build a new upper building based on the construction of a new pile.

JP 2006-299659 A

  This invention considers the fact concerned, and makes it a subject to provide the design method of the building which can build an upper building in the site where the design freedom of a building foundation is low.

According to the first aspect of the invention, based on the step of calculating the allowable bearing capacity of the existing foundation, the allowable bearing capacity of the existing foundation, and the position of the existing foundation, the allowable bearing capacity of each divided area dividing the rebuilding area is calculated. A building design method comprising: a calculating step; and a step of designing a building structure for each partition area based on an allowable bearing capacity for each partition area.

In the first aspect of the invention, the allowable support force for each partition area is calculated based on the calculated allowable support force of the existing foundation and the position of the existing foundation, and for each partition area based on the allowable support force of each partition area. Design the building structure. In other words, this is a design method opposite to the conventional design method of designing the building foundation from the planned building structure load. As a result, the building can be rebuilt even on a site where the building foundation cannot be freely constructed and the design flexibility of the building foundation is low. That is, it is possible to build the upper building on a site where the design flexibility of the building foundation is low.

According to the second aspect of the invention, in the building design method according to the first aspect , the allowable supporting force of a newly-founded foundation newly installed at a position where construction is possible is included in the allowable supporting force for each partition area.

In the invention of the second aspect , a building structure with a large load can be constructed by including the allowable supporting force of the newly-founded foundation into the allowable supporting force for each divided area.

The invention of the third aspect is the building design method of the first or second aspect , wherein the building structure is designed such that a pillar is positioned above the existing foundation.

In the invention of the third aspect , the load of the building structure can be efficiently transmitted to the existing foundation.

  Since this invention was set as the said structure, an upper building can be built in the site | part with a low design freedom of a building foundation.

It is a perspective view which shows the building before the rebuilding which concerns on embodiment of this invention. It is a top view which shows the building before the rebuilding which concerns on embodiment of this invention. It is a top view showing foundation pile arrangement of a building before rebuilding concerning an embodiment of the present invention. It is a perspective view which shows the building designed by the building design method which concerns on embodiment of this invention. It is a top view which shows the building designed by the building design method which concerns on embodiment of this invention. It is a top view which shows the foundation pile arrangement | positioning of the building designed by the building design method which concerns on embodiment of this invention. It is a perspective view which shows the seismic isolation building designed by the building design method which concerns on embodiment of this invention.

  Embodiments of the present invention will be described with reference to the drawings. First, a building design method according to an embodiment of the present invention will be described.

  In this embodiment, an example is shown in which a new building that can be reconstructed by demolishing an old building is designed by the building design method of the present invention. The perspective view of FIG. 1 and the plan view of FIG. 2 show an old reinforced concrete building 10 before being rebuilt, and the perspective view of FIG. 4 and the plan view of FIG. A reinforced concrete building 12 is shown. In addition, the triangular symbol indicating the letter “N” drawn in the drawings of FIGS. 1 to 7 indicates the north direction.

  As shown in FIGS. 1 and 2, the building 10 is built on a site 14, and is located from the south side to the north side via a pedestrian deck 18 having a colonnade 16 in the center, and the south wing 20 and the north wing 22. And is composed of.

  The south wing 20 includes a two-story structure 24 and a one-story structure 26 (an auditorium having a large space) adjacent to the structure 24. The north wing 22 includes a two-story structure 28 and a one-story structure 30 (an auditorium having a large space) adjacent to the structure 28. The structures 24, 26, 28, and 30 have substantially the same building height. Further, the south wing 20 and the north wing 22 are arranged symmetrically via the pedestrian deck 18.

  As shown in the plan view of FIG. 3, the foundation of the building 10 is constituted by a plurality of foundation piles 34 embedded in the ground 32 forming the site 14. The area of the site 14 where the building 10 is built is divided into five divided areas 36A, 36B, 36C, 36D, and 36E, and acts on the divided areas 36A, 36B, 36C, 36D, and 36E from the building 10. The foundation pile 34 arrange | positioned in each division area 36A, 36B, 36C, 36D, 36E bears the load, respectively.

  As shown in FIGS. 4 and 5, the building 12 is built on the site 14 where the building 10 was built, and includes a central building 40 composed of a three-story structure 38, and a central building 40. The south wing 42 and the north wing 44 are arranged from the south side to the north side.

  The south wing 42 includes a five-story structure 46 and a two-story structure 48 adjacent to the structure 46. The north wing 44 includes a four-story structure 50 and a two-story structure 52 adjacent to the structure 50. The structures 48 and 52 have substantially the same building height. The structure 38 has a higher building height than the structures 48 and 52, the structure 50 has a higher building height than the structure 38, and the structure 46 has a higher building height than the structure 50. It is high.

  As shown in the plan view of FIG. 6, the foundation of the building 12 uses the foundation of the building 10 as it is. That is, the foundation of the building 12 is configured only by the foundation pile 34 as an existing foundation that is an existing pile that has constituted the foundation of the building 10. The area of the site 14 as a rebuilding area where the building 12 is built is different from the five partitioned areas 36A, 36B, 36C, 36D, and 36E shown in FIG. 3, and is divided into five partitioned areas 54A, 54B, 54C, and 54D. , 54E, and the piles 34 arranged in each of the divided areas 54A, 54B, 54C, 54D, 54E are applied to the loads acting on the divided areas 54A, 54B, 54C, 54D, 54E from the building 12, respectively. I bear it.

  The building design method according to the present embodiment includes an existing support capacity calculation process, an area support capacity calculation process, and a building structure design process. First, in the existing bearing capacity calculation step, the allowable bearing capacity of each foundation pile 34 as the existing foundation shown in FIG. 3 is calculated.

  Next, in the area bearing capacity calculation process, based on the allowable bearing capacity of each foundation pile 34 calculated in the existing bearing capacity calculation process and the position of each foundation pile 34, the divided areas 54A, 54B, shown in FIG. The permissible bearing capacity for each of 54C, 54D, and 54E is calculated.

  Next, in the building structure design process, each partition area 54A, 54B, 54C, 54D, 54E is shown in FIG. 4 and FIG. 5 based on the permissible supporting force for each partition area 54A, 54B, 54C, 54D, 54E. The structures 48, 46, 38, 50, and 52 are designed as building structures. In the present embodiment, the structures 48, 46, 38, 50, 52 to be built in each partition area 54A, 54B, 54C, 54D, 54E according to the permissible supporting force of each partition area 54A, 54B, 54C, 54D, 54E. The structures 48, 46, 38, 50, 52 are designed by changing the height of the building so as to be equal to or less than the set load.

  Specifically, a five-story structure 46 having a large building load is arranged in the partitioned area 54B having the largest allowable supporting force, and the structure 46 has a smaller allowable supporting force than the partitioned area 54B. A four-story structure 50 having a smaller load is disposed, and a three-story structure 38 having a smaller load than the structure 50 is disposed in a partition area 54C having a smaller allowable supporting force than the partition area 54D. The design is made such that the two-story structures 48 and 52 having a load smaller than that of the structure 38 are arranged in the divided areas 54A and 54E having a smaller allowable supporting force than the area 54C. That is, a design is performed in which a structure having a high building height is built in a partitioned area where a structure having a large building load can be built due to a large allowable bearing capacity.

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

  In the building design method of the present embodiment, as shown in FIGS. 3 and 6, the divided areas 54 </ b> A, 54 </ b> B, and 54 </ b> C are calculated from the calculated allowable support force of the foundation pile 34 as the existing foundation and the position of the foundation pile 34. , 54D and 54E are calculated, and based on the allowable support force for each of the divided areas 54A, 54B, 54C, 54D and 54E, the building structure for each of the divided areas 54A, 54B, 54C, 54D and 54E The structures 48, 46, 38, 50, 52 are designed. In other words, this is a design method opposite to the conventional design method of designing the building foundation from the planned building structure load. As a result, the building can be rebuilt even on a site where the building foundation cannot be freely constructed and the design flexibility of the building foundation is low. That is, it is possible to build the upper building on a site where the design flexibility of the building foundation is low.

  For example, existing piles are removed due to reasons such as buried cultural assets, underground pipes, underground passages, subway tunnels, etc. being buried in the direct foundation board of the planned building structure, or because the site where the planned building structure is built is narrow It is difficult to reconstruct new piles, avoid building existing piles and construct new piles, or limit the places where new piles can be built. Even on sites with low design flexibility for building foundations that cannot be freely constructed, the building structure is designed based on the allowable bearing capacity of the existing foundation and the position of the existing foundation. be able to. Thereby, it is possible to rebuild a building even in a site that conventionally had to give up the rebuilding of the building.

  The embodiment of the present invention has been described above.

  In addition, in this embodiment, the example which calculates the permissible bearing capacity for every division area 54A, 54B, 54C, 54D, 54E from the permissible bearing capacity of the foundation pile 34 as an existing foundation and the position of the foundation pile 34 is calculated. As shown, it is only necessary to calculate the permissible bearing capacity for each division area based on the calculated permissible bearing capacity of the existing foundation and the position of the existing foundation, and the ground bearing capacity of the ground 32 is included in the allowable bearing capacity for each division area. May be. Moreover, you may include the allowable supporting force of the new pile as a new foundation newly installed in the position which can be constructed | assembled in the ground 32 in the allowable supporting force for every division area. If it does in this way, the building structure of a big load can be constructed | assembled by including the allowable supporting force of a new foundation in the allowable supporting force for every division area.

  In the present embodiment, as an example of designing the structures 48, 46, 38, 50, and 52 as a building structure based on the permissible supporting force for each of the calculated divided areas 54A, 54B, 54C, 54D, and 54E. The loads of the structures 48, 46, 38, 50, 52 to be built in the respective partition areas 54A, 54B, 54C, 54D, 54E are set in accordance with the allowable supporting force of the respective partition areas 54A, 54B, 54C, 54D, 54E. However, the example of designing the structures 48, 46, 38, 50, 52 by changing the building height so as to be equal to or less than the set load has been described. The structural form may be made different, or the seismic elements may be concentrated on the structure arranged in the partitioned area where the set load is large.

  Further, in the present embodiment, in the building structure design process, the structures 48, 46, 38, 50, as the building structure are based on the permissible supporting force for each of the calculated divided areas 54A, 54B, 54C, 54D, 54E. In the building structure design process, the building structure may be designed so that the pillar of the building structure is positioned above the foundation pile as the existing foundation. If it does in this way, the load of a building structure can be efficiently transmitted to an existing foundation. When building the building structure on the ground where the existing pile is buried using the conventional design method, it is almost impossible that the column of the building structure planned earlier is placed just above the existing pile. However, according to the present invention, the building structure is designed based on the allowable supporting force of the existing foundation and the position of the existing foundation, so that this is possible.

  In addition, the building design method shown in the present embodiment can be applied to buildings of various structural forms and scales. For example, the present invention can be applied to buildings of various structures and scales such as steel structures, reinforced concrete structures, steel reinforced concrete structures, CFT structures (Concrete-Filled Steel Tubes), and mixed structures thereof. For example, you may design the seismic isolation building 56 as shown in the perspective view of FIG. 7 using the building design method of this embodiment. The seismic isolation building 56 is designed with a building structure in which the building height of the structure constituting each building is lower than that of the building 12 by one floor in consideration of the load of the basic seismic isolation layer. That is, the structure 64 constituting the central building 58 is made up of two stories, the structures 66 and 68 constituting the south building 60 are made up of four stories and one story, and the structures 70 and 72 constituting the north building 62 are arranged. It has 3 floors and 1 floor.

  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.

34 Foundation pile (existing foundation)
38, 46, 48, 50, 52 Structure (building structure)
54A, 54B, 54C, 54D, 54E

Claims (3)

Calculating the allowable bearing capacity of the existing foundation;
A step of calculating an allowable supporting force for each divided area that divides the rebuilding area, based on the allowable supporting force of the existing foundation and the position of the existing foundation;
Designing a building structure for each partition area based on the allowable support force for each partition area calculated based on the allowable support force of the existing foundation and the position of the existing foundation ;
Design method of building having. The building design method according to claim 1, wherein the allowable supporting force for each partition area includes an allowable supporting force for a newly-founded foundation at a position where construction is possible.   The building design method according to claim 1 or 2, wherein the building structure is designed such that a pillar is positioned above the existing foundation.

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