JP7098436B2 - Foundation structure of the building - Google Patents

Description

One embodiment of the present invention relates to a ground improvement body and a foundation structure of a building.

There is a direct foundation as a foundation type that supports the load of the building on the ground. The direct foundation transfers the load of the building to the hard ground when there is hard ground in a relatively shallow part of the ground. On the other hand, when soft ground is deposited directly under the building, piles are built in the ground to reach a solid ground layer (hereinafter referred to as the support layer) that has sufficient strength to support the weight of the building. A pile foundation that transfers weight to the support layer is used. However, when building a low-rise building on soft ground with a deep support layer, it may be uneconomical to adopt a pile foundation. In addition, there are problems such as an increase in the amount of waste soil generated by constructing pile foundations up to a large depth and an increase in environmental load.

Therefore, as in Non-Patent Document 1, Patent Document 1 and Patent Document 2, when the building weight is not large, the soft ground is improved with a cement-based solidifying material or the like to form a ground improvement body, thereby increasing the bearing capacity of the ground. By securing and directly using the foundation form as the foundation, rational and economical design and construction are carried out.

Even if the area near the surface of the ground is improved on soft ground, if a building is constructed using a direct foundation, problems such as uneven subsidence (tilting diagonally) may occur. There is sex. In that case, there is a concern that the floor may be cracked or tilted, which may cause problems in use. Non-Patent Documents 1 to 3 show a method of suppressing such uneven settlement and ensuring bearing capacity. Further, when a ground improvement body is used, it is required to suppress horizontal sliding on the bottom surface of the ground improvement body in the event of an earthquake, and a design method thereof is shown (see Non-Patent Document 4).

Japanese Unexamined Patent Publication No. 2005-146556 Japanese Unexamined Patent Publication No. 2008-280828

Hiroyuki Sasaki, 3 outsiders, "Direct foundation building built on soft ground with shallow layer improvement", Architectural Institute of Japan Conference Academic Lecture Summary, 1999, September, p. 725-726 Mamoru Sahara, 1 outsider, "Large warehouse directly supported by shallow layer improvement combined foundation on embankment", Architectural Institute of Japan Conference Academic Lecture Summary, 2010, September, p. 465-466 Naoya Matayoshi, 1 outsider, "Observation of subsidence of apartment houses directly supported by foundations on improved soil built in alluvial lowlands", Architectural Institute of Japan Conference Academic Lecture Summary, September 2005, p. 595-596 Architectural Institute of Japan, "Draft Ground Improvement Design Guidelines for Building Foundations", 4th Edition, Architectural Institute of Japan, May 25, 2012, p. 87-88

Against the background of the large amount of damage to the ground caused by large earthquakes in recent years, it is required to suppress the sliding of the bottom surface of the ground improvement body even with a larger seismic force, in addition to suppressing uneven subsidence.

In view of the above problems, it is an object of the present invention to provide a structure capable of suppressing uneven subsidence and increasing the resistance force of the ground improvement body to horizontal sliding in the event of an earthquake. It is one of.

According to one embodiment of the present invention, a first portion having a first outer peripheral portion, a second portion extending outward from the end portion of the first outer peripheral portion of the first portion, and a first portion and a second portion. It has a third portion provided above and having a second outer peripheral portion provided outside the end portion of the first outer peripheral portion, and the second portion is ground provided below the second outer peripheral portion. An improved version is provided.

In the above-mentioned ground improvement body, a plurality of third portions are provided, two adjacent second portions have a portion connected to the second outer peripheral portion of the third portion, and the second outer peripheral portion is two adjacent second outer peripheral portions. It may be provided between the two parts.

In the above-mentioned ground improvement body, the first portion may have a partition portion which is connected to the first outer peripheral portion and forms a plurality of partitioned regions inside the first outer peripheral portion.

In the above-mentioned ground improvement body, the first portion may be provided in a grid pattern.

In the above-mentioned ground improvement body, the thickness of the second portion may be thinner than the thickness of the first portion.

In the above-mentioned ground improvement body, the thickness of the second portion may be thicker than the thickness of the first portion.

In the ground improvement body, the first outer peripheral portion of the first portion has a portion along the first direction and a portion along the second direction intersecting the first direction, and the second portion is the first portion of the first portion. 1 The extending direction of the outer peripheral portion extending from the corner portion and extending the second portion is on the same plane as the first direction and the second direction, and is the same as at least one of the first direction and the second direction. You may.

In the ground improvement body, the first outer peripheral portion of the first portion has a portion along the first direction and a portion along the second direction intersecting the first direction, and the second portion is the first portion of the first portion. (1) The extending direction of the second portion extending from the corner of the outer peripheral portion may be on the same plane as the first direction and the second direction, and may be different from the first direction and the second direction.

In the above-mentioned ground improvement body, the second portion may be further provided between adjacent corners of the first outer peripheral portion of the first portion and may extend to the outside of the first outer peripheral portion.

In the above-mentioned ground improvement body, the bottom surface of the second portion may have irregularities.

In the above-mentioned ground improvement body, the bottom surface of the second portion may have a staircase shape.

In the above-mentioned ground improvement body, a fourth portion which is provided below the bottom surface of the first portion and has a columnar shape may be provided.

According to one embodiment of the present invention, a basic structure of a building including the above-mentioned ground improvement body and a foundation structure provided on the above-mentioned ground improvement body is provided.

According to one embodiment of the present invention, it is possible to provide a basic structure of a building capable of suppressing uneven subsidence and increasing the resistance to horizontal sliding of the building.

It is a top view which shows the ground improvement body of one Embodiment of this invention. It is a bottom view which shows the ground improvement body of one Embodiment of this invention. It is sectional drawing which shows the ground improvement body of one Embodiment of this invention. It is a top view which shows the time when the ground improvement body of one Embodiment of this invention slides. It is sectional drawing which shows the formation method of the ground improvement body of one Embodiment of this invention. It is a top view which shows the ground improvement body of one Embodiment of this invention. It is a top view which shows a part of the ground improvement body of one Embodiment of this invention. It is a top view which shows the ground improvement body of one Embodiment of this invention. It is a top view and sectional view which shows the ground improvement body of one Embodiment of this invention. It is a top view and sectional view which shows the ground improvement body of one Embodiment of this invention. It is a top view and sectional view which shows the ground improvement body of one Embodiment of this invention. It is a top view and sectional view which shows the ground improvement body of one Embodiment of this invention. It is a top view and sectional view which shows the foundation structure of the building of one Embodiment of this invention. It is a top view and sectional view which shows the foundation structure of the building of one Embodiment of this invention.

Hereinafter, the foundation structure of the ground improvement body and the building in one embodiment of the present invention will be described with reference to the drawings. However, the foundation structure of the ground improvement body and the building according to one embodiment of the present invention can be implemented in many different modes, and is not construed as being limited to the contents of the examples shown below. .. In the drawings referred to in one embodiment of the present invention, the same parts or parts having similar functions are designated by the same reference numerals, and the repeated description thereof will be omitted.

Also, for convenience of explanation, the phrase "upper (upper)" or "lower (lower)" is used, but "upper (upper)" indicates the direction perpendicular to the sky from the ground surface, and "lower (lower)". Downward) ”indicates the direction from the sky to the ground vertically. The horizontal direction indicates a direction parallel to the ground surface.

<First Embodiment>
(1-1. Configuration of ground improvement body)
FIG. 1 is a top view of the ground improvement body 100. FIG. 2 is a bottom view of the ground improvement body 100. FIG. 3A is a cross-sectional view between A1 and A2 of the ground improvement body 100. FIG. 3B is a cross-sectional view between B1 and B2 of the ground improvement body 100. FIG. 3C is a cross-sectional view between C1 and C2 of the ground improvement body 100.

As shown in FIGS. 1, 2, 3, 3 (A), 3 (B), and 3 (C), the ground improvement body 100 is provided on the surface layer of the ground 50. The ground 50 is a soft ground. On the other hand, the ground improvement body 100 is solidified by adding a solidifying material typified by cement or the like in addition to the soil contained in the ground 50, stirring and mixing. As the cement, for example, Portland cement is usually used. Therefore, the ground improvement body 100 has higher strength and rigidity than the ground 50. The ground improvement body 100 has a lower improvement body 110 (sometimes referred to as a first part), an extension improvement body 130 (sometimes referred to as a second part), and an upper improvement body 120 (sometimes referred to as a third part). In this example, the lower improved body 110, the upper improved body 120, and the extended improved body 130 have the same strength and rigidity, respectively.

As shown in FIGS. 1 and 2, the lower improved body 110 refers to a portion of the ground improved body 100 which is provided below and has four corners 116 and has a square outer shape. The lower improved body 110 has an outer peripheral portion 112 (also referred to as a first outer peripheral portion) and a partition portion 114. The outer peripheral portion 112 has a portion along the first direction D1 and a portion along the second direction D2 orthogonal to the first direction D1. The outer peripheral portion 112 forms an outer frame of the lower improved body 110. The partition portion 114 is provided in connection with the outer peripheral portion 112, and forms a plurality of partitioned regions 50a inside the outer peripheral portion 112. In this example, the partition portion 114 has a portion along the first direction D1 and a portion along the second direction D2, each of which is arranged orthogonally. At this time, the lower improved body 110 has a lattice shape by providing a region partitioned into a square by the outer peripheral portion 112 and the partition portion 114. As shown in FIG. 3B, the bottom surface 110d of the lower improved body 110 has a flat shape.

The upper improved body 120 refers to a portion of the ground improved body 100 having four sides provided in a plane on the lower improved body 110. The upper improved body 120 has a portion (internal region 121) that overlaps with the lower improved body 110 and a portion that extends outward from the end portion 112e of the lower improved body 110 (also referred to as an outer peripheral portion 122 and a second outer peripheral portion). Have. In this example, the outer peripheral portion 122 is arranged so as to extend outward from the four sides of the lower improved body 110. Further, in this example, the thickness t110 of the lower improved body 110 and the thickness t120 of the upper improved body 120 are the same.

The extension improved body 130 refers to a portion of the ground improved body 100 extending outward from the outer peripheral portion 112 of the lower improved body 110. The extension improved body 130 is provided below the outer peripheral portion 122 of the upper improved body 120. As shown in FIGS. 1, 2 and 3 (B), the extension improving body 130 is located between the end portion 112e of the outer peripheral portion 112 of the lower improving body 110 and the end portion 122e of the outer peripheral portion 122 of the upper improving body 120. Has a portion provided in. In this example, as shown in FIGS. 1 and 2, the extension improved body 130 is provided extending to the end portion 122e of the outer peripheral portion 122. Further, the extension improved body 130 is in contact with the outer peripheral portion 122 of the upper improved body 120, and the bottom surface 130d has a flat shape.

Further, as shown in FIGS. 1 to 3, a plurality of extended improved bodies 130 are provided. In this example, the extension improved body 130-1 is provided extending from the corner portion 116-1 of one side 112a of the outer peripheral portion 112 of the lower improved body 110. The extension improved body 130-2 is provided extending from the corner 116-2. The extension improved body 130-1 and the extension improved body 130-2 are arranged next to each other. At this time, the extending direction of the extended improved body 130-1 and the extended improved body 130-2 has the same direction as the second direction D2. Further, in the corner portion 116-1, the extension improved body 130 (extended improved body 130-1) extends from one side 112b along the first direction D1 together with a portion (part 130-1a) extending along the second direction D2. It has an extending portion (part 130-1b). Further, in the corner portion 116-2, the extension improved body 130 (extended improved body 130-2) extends from one side 112c along the first direction D1 together with a portion (part 130-2a) extending along the second direction D2. It has an extending portion (part 130-2b). Similarly, in the corner 116-2, the corner 116-3, and the corner 116-4, the extension improved body 130 has a portion extending along the first direction D1 and a portion extending along the second direction D2. I am doing. Therefore, in FIG. 1, the lower improved body 110 and the extended improved body 130 are arranged in a well shape (well girder shape).

Since the ground improvement body 100 has the above structure, as shown in FIG. 3A, the area 50a surrounded by the side surface 110s of the lower improvement body 110 and the bottom surface 120d of the upper improvement body 120 of the ground 50 is restrained. , It is possible to suppress compression deformation and shear deformation of soft ground. In addition, the surface-integrated ground improvement body supports the building load, so that uneven subsidence can be suppressed.

In the present embodiment, a plurality of extension improved bodies 130 are provided, and two adjacent portions (specifically, extension improved body 130-1 and extension improved body 130-2) of the plurality of extension improved bodies 130 in the ground 50 are provided. It has a restraining effect on the region 50b provided between them. As a result, the compressive deformation and shear deformation of the restrained soft ground are suppressed, so that the sliding resistance can be further increased.

上記より、本実施形態を用いることより力Ｎ５０に対する水平投影面積を大きくすることができるため、地盤改良体１００の滑動に対する抵抗力を増大させることができる。 FIG. 4 is a schematic view showing a case where the ground improvement body 100 slides in the lateral direction. As shown in FIG. 4, when the ground improvement body 100 tries to move with a force N100 in the second direction D2 due to an earthquake or the like, the ground 50 receives the ground improvement body 100 with the force N50. At this time, since the ground improvement body 100 has the extension improvement body 130 (in this example, the extension improvement body 130-1 portion 130-1b and the extension improvement body 130-2 portion 130-2b), the lower improvement body 110 In addition to the width L1 of the above, the width L2-1 and the width L2-1 of the extended improved body are expanded. As shown in FIG. 3B, when the height t110 of the lower improved body 110 and the height t130 of the extended improved body 130 are the same, the horizontal projected area A which is the area of the plane perpendicular to the force N50 is as follows. It becomes an expression.

From the above, since the horizontal projected area with respect to the force N50 can be increased by using the present embodiment, the resistance force against the sliding of the ground improvement body 100 can be increased.

Further, as shown in FIGS. 1, 2 and 3 (C), two adjacent portions of the plurality of extended improved bodies 130 are connected to and supported by the outer peripheral portion 122 of the upper improved body 120. Have. At this time, the upper improved body 120 is also provided between the extended improved body 130-1 and the extended improved body 130-2 on a plane. As a result, it is possible to prevent the extension improved body 130 overhanging to the outside from being locally destroyed.

(1-2. Method of forming ground improvement body)
Next, an example of a method for forming the ground improvement body 100 will be described with reference to the top view and the cross-sectional view of FIG. First, as shown in FIGS. 5 (A1) and 5 (A2), an excavation process is performed to form a dent 55 having a predetermined shape on the surface layer of the ground 50 on which the ground improvement body 100 is to be formed. The ground 50 is a soft ground. The method of excavating the ground 50 is not particularly limited, but is performed by excavating the soil using a heavy machine such as a backhoe based on a mark provided in advance. At this time, the depth (corresponding to the thickness t110) of the recess 55-1 which is the lower improved body 110 (and the extended improved body 130 (not shown)) of the recess 55 is the recess 55- which is the upper improved body 120. It is the same as the depth of 2 (corresponding to the thickness t120).

Next, the ground improvement body 100 is formed in the provided recess 55. The ground improvement body 100 is formed by embedding a mixture of excavated soil and a solidifying material (cement or the like). As the cement, for example, ordinary Portland cement is usually used, and mainly contains lime (calcium) and oxides such as aluminum, silicon and iron. In addition to ordinary Portland cement, blast furnace cement, silica cement and the like may be used. At this time, as shown in FIGS. 5 (B1) and 5 (B2), soil and cement are sprayed on the recess 55 (recess 55-1) to be the lower improved body 110, water is added, and the roller is stirred. Compact (roll) using a heavy machine such as. Subsequently, as shown in FIGS. 5 (C1) and 5 (C2), the same forming process is also performed on the recess 55 (recess 55-2) to be the upper improved body 120. As a result, the ground improvement body 100 is formed on the surface layer of the ground 50.

The ground improvement referred to here is to improve the strength and rigidity of the ground by adding a solidifying agent using a material having a solidifying action such as cement, water glass, and microorganisms to the soil. Therefore, the method for forming the ground improvement body 100 is not limited to this method. For example, the ground improvement body 100 may form the ground improvement body 100 by sprinkling cement on the soil and stirring and mixing the cement on the spot.

<Second Embodiment>
In this embodiment, a ground improvement body having a different shape from the ground improvement body of the first embodiment will be described. In addition, about the part which has the same structure and name as 1st Embodiment, the explanation is referred to.

(Structure of ground improvement body 100A)
FIG. 6 shows a top view of the ground improvement body 100A. As shown in FIG. 6, the ground improvement body 100A includes a lower improvement body 110, an upper improvement body 120, and an extension improvement body 130A.

In the present embodiment, the direction D3 in which the extension improvement body 130 of the ground improvement body 100A extends is on the same plane as the first direction D1 and the second direction D2, and is in a direction different from the second direction D2 (oblique direction). May be. As a result, the range of ground improvement of the ground improvement body 100A can be reduced, and economical construction becomes possible. Further, by providing the extended improved body 130A, the horizontal projected area can be increased, and the resistance force when trying to slide in the vertical direction and the horizontal direction can be increased.

FIG. 7 is a top view showing a part of the ground improvement body 100A (particularly a modified example of the extension improvement body 130A). As shown in FIG. 7A, the extended improved body 130A1 may extend in the third direction D3 and may have an end portion 130A1e. At this time, the end portion 130A1e may be orthogonal to the third direction D3. By having this shape, the ground improvement body 100A is provided with a surface orthogonal to the third direction D3 by having this shape, so that the resistance force when trying to slide in the third direction is increased. can do.

Further, as shown in FIG. 7B, the extended improved body 130A2 may extend in the first direction D1 and the second direction D2 and have a shape like a right triangle, and may have an end portion 130A2e. .. The end portion 130A2e is orthogonal to D3 in the third direction like the end portion 130A1e, but is longer than the length of the end portion 130A1e. By having this shape, the ground improvement body 100A is provided with a surface orthogonal to the third direction D3, so that the resistance force when trying to slide in the third direction can be increased.

Further, as shown in FIG. 7C, the extended improved body 130A3 may extend in the third direction D3 and may have an end portion 130A3e. The end portion 130A3e may have a recessed (valley) portion.

Further, as shown in FIG. 7D, the extension improved body 130A4 may have a shape in which the extension improved body 130 provided on two sides is combined.

Further, as shown in FIG. 7 (E), the extension improved body 130A5 may have a shape like an isosceles triangle extending in the third direction D3. Further, as shown in FIG. 7 (F), the extension improved body 130A6 may have a shape having protrusions on three sides. At this time, a plurality of end portions 130A6e having dents are provided.

As described above, the extension improved body 130 extends in various directions and has various shapes, so that in addition to the first direction D1 and the second direction D2, the sliding resistance in various directions in the horizontal direction can be obtained. It can be obtained more effectively.

<Third Embodiment>
In this embodiment, a ground improvement body having a shape different from that of the ground improvement bodies of the first embodiment and the second embodiment will be described. In addition, about the part which has the same structure and name as 1st Embodiment and 2nd Embodiment, the description is referred to.

(Structure of ground improvement body 100B)
FIG. 8 shows a top view of the ground improvement body 100B. As shown in FIG. 8, in the present embodiment, the ground improvement body 100B has a lower improvement body 110, an upper improvement body 120, and an extension improvement body 130B. The extension improved body 130B is provided between the adjacent corner portions 116 together with the first extension improved body 130B1 extending from the corner 116 of the outer peripheral portion 112 of the lower improved body 110, and extends outward. It has an improved body 130B2. In this example, the second extension improver 130B2 extends in the first direction D1 or the second direction D2.

Since the extension improved body 130B has the second extension improved body 130B2 together with the first extension improved body 130B1, the area 50b of the soft ground between the adjacent portions of the extended improved body 130B becomes smaller, so that the extended improved body 130B becomes a soft ground. On the other hand, it has a higher restraining effect. As a result, the deformation of the restrained soft ground is suppressed, and the sliding resistance can be further increased.

<Fourth Embodiment>
In this embodiment, the ground improvement body having a different shape from the ground improvement body of the first to third embodiments will be described. In addition, about the part having the same structure and name as the 1st to 3rd Embodiment, the explanation is referred to.

(Structure of ground improvement body 100C)
FIG. 9A shows a top view of the ground improvement body 100C. FIG. 9B shows a cross-sectional view between B1 and B2 of the ground improvement body 100C. As shown in FIGS. 9A and 9B, the ground improvement body 100C is a columnar improvement body 140 (also referred to as a fourth part) in addition to the lower improvement body 110, the upper improvement body 120 and the extension improvement body 130. including.

The columnar improved body 140 is provided below the bottom surface 110d of the lower improved body 110 and has a columnar shape. In this example, the columnar improved body 140 is periodically arranged at the 110 outer peripheral portion 112 and the partition portion 114 of the lower improved body (more specifically, it is arranged at the portion where the foundation structure and the pillar are provided). .. The length of the columnar improved body 140 is not particularly limited, and may have a desired length as needed. The columnar improved body 140 extends in a direction orthogonal to the extended improved body 130.

By having the columnar improved body 140, the ground improved body 100C has a wide portion orthogonal to the horizontal force (sway). Therefore, it is possible to increase the sliding resistance of the ground improvement body in a natural disaster such as an earthquake.

Further, since the ground improvement body 100C has the columnar improvement body 140, when the ground improvement body 100C tries to sink due to its own weight or the weight of the building, a frictional force acts on the peripheral surface of the 140. .. Therefore, the frictional force can suppress subsidence.

<Fifth Embodiment>
In this embodiment, the ground improvement body having a different shape from the ground improvement body of the first to fourth embodiments will be described. In addition, about the part which has the same structure and name as 1st to 4th Embodiment, the explanation is referred to.

(Structure of ground improvement body 100D)
FIG. 10A shows a top view of the ground improvement body 100D. FIG. 10B shows a cross-sectional view between B1 and B2 of the ground improvement body 100D. As shown in FIGS. 10A and 10B, the ground improvement body 100D has a lower improvement body 110D, an upper improvement body 120, and an extension improvement body 130D. As shown in FIGS. 10A and 10B, the bottom surface 110Dd of the lower improved body 110D and the bottom surface 130Dd of the extended improved body 130D may have an uneven shape as a whole. Since the ground improvement body 100D has the above-mentioned shape, the frictional resistance at the bottom surface 110Dd is increased, so that the sliding resistance in the horizontal direction can be further increased. In the present embodiment, the bottom surface 110Dd of the lower improved body 110D and the bottom surface 130Dd of the extended improved body 130D all have a shape having unevenness, but a part may have a shape having unevenness. ..

<Sixth Embodiment>
In this embodiment, the ground improvement body having a different shape from the ground improvement body of the first to fifth embodiments will be described. In addition, about the part which has the same structure and name as 1st to 5th Embodiment, the explanation is referred to.

(Structure of ground improvement body 100E)
FIG. 11A shows a top view of the ground improvement body 100E. FIG. 11B shows a cross-sectional view between B1 and B2 of the ground improvement body 100E. As shown in FIGS. 11A and 11B, the ground improvement body 100E has a lower improvement body 110, an upper improvement body 120, and an extension improvement body 130E. As shown in FIGS. 10A and 10B, the bottom surface 130Ed of the extended improved body 130E may have a staircase shape (a shape having diagonal irregularities). By having the above shape, it is possible to increase the horizontal projected area while reducing the volume of the entire ground improvement body, and it is possible to increase the sliding resistance in the horizontal direction. The bottom surface of the lower improved body 110 may also have a staircase shape in part.

<7th Embodiment>
In this embodiment, the ground improvement body having a different shape from the ground improvement body of the first to sixth embodiments will be described. In addition, about the part which has the same structure and name as 1st to 6th Embodiment, the explanation is referred to.

(Structure of ground improvement body 100F)
FIG. 12A shows a top view of the ground improvement body 100F. FIG. 12B shows a cross-sectional view between B1 and B2 of the ground improvement body 100F. As shown in FIGS. 12A and 12B, in the ground improvement body 100F, the thickness t130F of the extension improvement body 130F may be thinner than the thickness t110 of the lower improvement body 110. Further, the extended improved body 130F does not have to be connected to the upper improved body 120. By having this shape, it is possible to increase the sliding resistance of the ground improvement body in a natural disaster such as an earthquake.

<8th Embodiment>
In this embodiment, the basic structure of the building including the ground improvement body 100 will be described.

(Structure of foundation structure 10 of building)
13 (A) is a top view of the foundation structure 10 of the building, and FIG. 13 (B) is a cross-sectional view of the foundation structure 10 of the building between A1 and A2. As shown in FIGS. 13 (A) and 13 (B), the foundation structure 10 of the building has a foundation structure 200 and a superstructure 300 in addition to the ground improvement body 100.

The foundation structure 200 (referred to as a direct foundation) is a part that becomes the foundation of a building. The foundation structure 200 is provided on the ground improvement body 100. In this example, the foundation structure 200 has a solid foundation that is widely and planarly arranged. Further, the foundation structure 200 is provided in a recess provided in a part of the ground improvement body 100 (in this case, the upper improvement body 120). With this structure, the support stability of the foundation structure 200 with respect to the building can be improved. At this time, the extension improved body 130 is provided on the outside of the basic structure 200.

The superstructure 300 is provided on the ground improvement body 100 and the foundation structure 200. Further, the upper structure 300 is provided so as to be superimposed on the lower improved body 110, and is arranged in a grid pattern like the lower improved body 110.

By having the ground improvement body 100, the foundation structure 10 of the building of the present embodiment can suppress the uneven subsidence of the building and also suppress the sliding in the horizontal direction.

In the present embodiment, the solid foundation is shown as the foundation structure 200 of the foundation structure 10 of the building, but the present invention is not limited to this. 14 (A) is a top view of the foundation structure 10A of the building, and FIG. 14 (B) is a cross-sectional view between A1 and A2 of the foundation structure 10A of the building. As shown in FIGS. 14A and 14B, the foundation structure 10A of the building has the foundation structure 200A and the superstructure 300 in addition to the ground improvement body 100. At this time, an independent foundation or a cloth foundation may be used for the foundation structure 200A.

(Modification 1)
In the first embodiment of the present invention, an example is shown in which the outer peripheral portion 122 of the upper improved body 120 is arranged so as to spread in all directions of the lower improved body 110, but the present invention is not limited thereto. For example, the outer peripheral portion 122 may be arranged only on one side of the lower improved body 110.

(Modification 2)
Further, in the first embodiment of the present invention, in FIGS. 3A and 3B, the thickness t110 of the lower improved body 110 and the thickness t120 of the upper improved body 120 have the same thickness. However, it does not have to be limited to this. For example, the thickness t120 of the upper improved body 120 may be thinner than the thickness t110 of the lower improved body 110.

(Modification 3)
Further, in the first embodiment of the present invention, the extension improved body 130 is provided extending to the end portion 122e of the outer peripheral portion 122 of the upper improved body portion 120, but is not limited thereto. The extension improver 130 may not extend to the end 122e of the outer peripheral portion 122 of the upper improver 120, or may extend outward from the end 122e.

(Modification example 4)
Further, in the first embodiment of the present invention, an example is shown in which the lower improved body 110, the upper improved body 120 and the extended improved body 130 of the ground improved body 100 have the same strength and rigidity, respectively. Not limited. In the ground improvement body 100, the strength and rigidity may be different between the lower improvement body 110 and the extension improvement body 130 and the upper improvement body 120. At this time, for example, the rigidity of the lower improved body 110 and the extended improved body 130 may be higher than that of the upper improved body 120. The above rigidity may be adjusted, for example, by changing the ratio of soil and cement, or by changing the component ratio in cement (calcium, aluminum, iron and silicon, as well as sodium, potassium, titanium, manganese, etc.). May be. By further increasing the strength and rigidity of the lower improved body 110 and the extended improved body 130, it is possible to stably receive the downward load applied from the building, and thus it is possible to suppress the uneven settlement of the foundation structure.

(Modification 5)
Further, in the first embodiment of the present invention, an example in which the lower improved body 110 has a grid pattern is shown, but the present invention is not limited thereto. The plurality of partitioned regions provided by the partition portion 114 are not limited to having a periodic shape, and may be provided with different intervals. Further, the number of partitioned areas is not limited to four, and may be six, nine, twelve, sixteen, or more. At this time, the outer shape of the lower improved body 110 may be rectangular instead of square, and may be trapezoidal or polygonal, and may have an optimum shape according to the planar shape of the building.

(Modification 6)
Further, in the first embodiment of the present invention, an example is shown in which the outer peripheral portion 112 has a first direction D1 and a second direction D2 orthogonal to the first direction D1, but the present invention is not limited thereto. The first direction D1 and the second direction D2 may intersect without being orthogonal to each other. At this time, the outer shape of the lower improved body 110 may be a rhombus.

(Modification 7)
Further, in the first embodiment of the present invention, the partition portion 114 of the lower improved body 110 has a portion along the first direction D1 and a portion along the second direction D2, and each of them is arranged orthogonally to each other. An example is shown, but the present invention is not limited to this. For example, the partition portion 114 may have a curved portion in part. Further, the partition portion 114 does not necessarily have to be provided. Further, the outer shape of the lower improved body 110 does not have to be rectangular. For example, the outer shape of the lower improved body 110 may be circular.

(Modification 8)
Further, in the first embodiment of the present invention, the ground improvement body 100 has been described using a material formed by mixing soil and a solidifying material (cement), but the present invention is not limited thereto. For example, the ground improvement body may be made by rolling gravel or crushed stone and laying it down.

Although the present invention has been described above with reference to the drawings, the present invention is not limited to the above-described embodiment, and can be appropriately modified without departing from the spirit of the present invention.

10 ... foundation structure, 50 ... ground, 100 ... ground improvement body, 110 ... lower improvement body, 112 ... outer peripheral part, 114 ... partition part, 116 ... corner part, 120 ... upper improved body, 122 ... outer peripheral part, 130 ... extended improved body, 140 ... columnar improved body, 200 ... basic structure, 300 ... upper structure

Claims (9)

The first portion having the first outer peripheral portion and
A second portion extending outward from the end of the first outer peripheral portion of the first portion, and a second portion.
It has a third portion provided on the first portion and the second portion and having a second outer peripheral portion provided outside the end portion of the first outer peripheral portion.
The second portion is provided below the second outer peripheral portion.
With the ground improvement body ,
Including the foundation structure provided on the ground improvement body,
The basic structure of the building . A plurality of the second parts are provided.
The two adjacent second portions have a portion connected to the second outer peripheral portion of the third portion.
The second outer peripheral portion is provided between the two adjacent second portions.
The basic structure of the building according to claim 1. The first portion is connected to the first outer peripheral portion and has a partition portion that forms a plurality of partitioned regions inside the first outer peripheral portion.
The foundation structure of the building according to claim 1 or 2. The first portion is provided in a grid pattern.
The basic structure of the building according to any one of claims 1 to 3 . The first outer peripheral portion of the first portion has a portion along the first direction and a portion along the second direction intersecting with the first direction.
The second portion extends from a corner of the first outer peripheral portion of the first portion.
The extending direction of the second portion is on the same plane as the first direction and the second direction, and is the same as at least one of the first direction and the second direction.
The basic structure of the building according to any one of claims 1 to 4 . The first outer peripheral portion of the first portion has a portion along the first direction and a portion along the second direction intersecting with the first direction.
The second portion extends from a corner of the first outer peripheral portion of the first portion.
The extending direction of the second portion is on the same plane as the first direction and the second direction, and is different from the first direction and the second direction.
The basic structure of the building according to any one of claims 1 to 5 . A ground improvement body having a lower improvement body, an upper improvement body provided on the lower improvement body, and a foundation structure on the ground improvement body are included.
The lower improved body has a first portion in a grid pattern and a second portion extending from an end portion of the first portion.
The upper improved body is provided on the first portion and the second portion.
The basic structure of the building. The bottom surface of the first portion or the second portion has irregularities.
The basic structure of the building according to any one of claims 1 to 7 . It is provided below the bottom surface of the first portion and has a fourth portion having a columnar shape.
The basic structure of the building according to any one of claims 1 to 8 .

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