JP2007284976A - Foundation structure of building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an epoch-making foundation structure of a building for exhibiting the novel action effect. <P>SOLUTION: One or a plurality of arranging materials 4 having the outer edge being the same outer edge as the outer edge of a foundation part 2 or having the outer edge extended outward from the outer edge of the foundation part 2, are arranged under the foundation part 2 of the building 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a foundation structure of a building.

  In recent years, earthquakes have occurred frequently, and as a seismic measure, seismic isolation structure (structure that installs a vibration isolation device between the ground and the building, separates the building from the ground and makes it difficult to transmit the vibration of the earthquake), seismic structure (Structures that increase the strength of structures such as columns, beams, braces, and respond to seismic forces) and vibration control structures (special oil dampers, etc. are installed between frames such as columns, beams, foundations, etc.) A structure that absorbs the deformation of buildings that sometimes occurs and reduces shaking is proposed.

  However, the seismic isolation structure and the seismic control structure are for large-scale buildings, and are still insufficient as a seismic countermeasure for detached houses, and are effective only for lateral vibrations in the vertical direction. There is a problem that the vibration is not effective.

  In addition, the earthquake-resistant structure improves the strength of the building itself, but has the problem that the shaking spreads as it is throughout the building and damage inside the building is increased.

  In addition, as for the earthquake resistance measures in the Building Standard Law, the vertical direction has not been studied, and the conventional earthquake resistance measures have not been taken into consideration for vibration measures due to traffic vibration.

  Therefore, conventionally, for example, an arrangement material made of a foamed resin material having a high compressive strength is provided below the foundation of the building, as disclosed in, for example, Japanese Patent No. 3150612, Japanese Patent No. 2980604, and Japanese Patent Application Laid-Open No. 2005-248555. A basic structure of a building (hereinafter, a conventional example) has been proposed.

  Since this conventional example has a structure in which a foamed resin material having a high compressive strength is provided in a part (lower part) of the foundation located below the building, the ratio of the ground compressed by the load of the building below the building The load on the ground can be reduced and this load can be distributed, so that the compression of the ground (same subsidence “a phenomenon where the entire building and foundation subsidence” or non-settled subsidence “building and The phenomenon that part of the foundation sinks and the building etc. tilts is reduced.

  In addition, the foamed resin arrangement material absorbs the vibration transmitted from the ground by the internal gap and reduces the vibration transmission to the building (because it exhibits a vibration reduction effect), so it will exhibit earthquake resistance Become.

Japanese Patent No. 3150612 Japanese Patent No. 2980604 JP 2005-248555 A

  By the way, in the conventional example, when actually determining the thickness of the arrangement material, the average unit weight of the building (the total weight of the building ÷ the area of the foundation) is calculated, and this value is based on the minimum value of the ground bearing capacity that can be found in the ground survey If it is smaller than the minimum value of the ground support force, install a material with the specified thickness, and if it is larger than the minimum value of the ground support force, the ground support force is insufficient. An arrangement material having a thickness determined from the above is arranged.

  However, the determination of the thickness of the arrangement material according to this conventional example does not consider the balance between the ground support force and the ground pressure, and therefore there is a high possibility that an accident of immediate settlement will occur.

  The compression settlement includes immediate settlement (settlement occurring in a relatively short time) and consolidation settlement (settlement occurring in a relatively long time), and the settlement method includes the same settlement and the unsettled settlement as described above. If the ground is weak, the same subsidence occurs, and if the part of the ground located below the building is weak, or if a part of the building is heavily loaded, the uneven subsidence occurs (the weight of the building exceeds the ground bearing capacity). In that case, the ground is destroyed.)

  The present inventor has further advanced research and development on the foundation structure of the building in which the arrangement material is arranged below the foundation of the building described above, and exhibits an epoch-making effect such as extremely excellent practicality. The basic structure of a typical building was developed.

  The gist of the present invention will be described with reference to the accompanying drawings.

  Below the foundation part 2 of the building 1, one or a plurality of arrangement members 4 whose outer edges are the same as the outer edge of the foundation part 2 or extend outward from the outer edge of the foundation part 2 are provided. In the basic structure of the building, the disposing material 4 is composed of a member having a specific gravity smaller than the ground on which the building 1 is installed, and the thickness P of the disposing material 4 is as follows: It relates to the basic structure of the building, which is characterized by being set.

Thickness P: The ground pressure at a plurality of locations of the building 1 is obtained from the centroid and the center of gravity of the building 1, the ground pressure at the plurality of locations is compared with the ground support force obtained in advance at the location, and the ground support When the relationship of force <ground pressure is established only at one location, the thickness P is set by the following equation 1, and when the relationship of ground support force <ground pressure is established at multiple locations, The maximum value of each thickness to be set is set as the thickness P.

Formula 1
(Ground pressure-Ground bearing capacity) ÷ (Unit weight of the ground-Unit weight of the arrangement material 4)
Further, in the foundation structure of a building according to claim 1, the disposing member 4 is one or a plurality of planar-view rectangular bodies provided on the entire lower surface of the foundation portion 2 of the building 1. It relates to the basic structure of the building.

  Moreover, in the foundation structure of the building according to any one of claims 1 and 2, the foundation portion 2 provided above the arrangement material 4 has a hanging portion 2a that contacts the arrangement material 4. An arrangement material 3 made of a member having a specific gravity smaller than that of the ground on which the building 1 is installed is arranged inside the hanging portion 2a. The height H of the space inside the hanging portion 2a to be disposed is related to the foundation structure of the building, which is set as follows.

Height H: It is set such that the deviation rate (eccentricity) between the rigid center on the first floor of the building 1 and the center of gravity of the foundation 2 is 0.3 or less.

  The building foundation structure according to any one of claims 1 to 3, wherein the disposing members 4 and 3 are formed of members having voids therein. It is related to.

  5. The building foundation structure according to claim 4, wherein a foamed resin material is employed as the member having a gap in the interior.

  In the present invention, as described above, since the thickness of the disposition material provided below the foundation of the building is set in consideration of the balance between the ground supporting force and the ground pressure, the compression settlement of the building and the foundation Of groundbreaking buildings with extremely high practicality, such as a good vibration reduction effect (vibration reduction effect) that reduces the vibrations that are transmitted to the building as much as possible. It becomes the basic structure.

  In the invention according to claim 3, the weight balance of the building in which the height of the inner space of the hanging portion of the foundation portion on which the arrangement material is arranged is reduced in the eccentricity at the foundation portion is taken into consideration. Therefore, it is possible to obtain a foundation structure that is extremely practical, such as a foundation structure that is difficult to deform.

  An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.

  Since the arrangement material 4 provided below the foundation part 2 of the building 1 is composed of a member having a specific gravity smaller than that of the ground on which the building 1 is installed, the weight of the foundation structure (the entire building) can be reduced. In addition, since this arrangement material 4 has an appropriate compressive strength, the ratio of the ground being compressed by the load of the building 1 below the building 1 is reduced, and the load on the ground is combined with the weight reduction of the entire building. It is reduced and the ground subsidence (immediate settlement) is reduced.

  Moreover, since the arrangement | positioning material 4 has a space | gap inside, the vibration which is going to be transmitted to a building attenuate | damps by this space | gap, Therefore The favorable vibration reduction effect (seismic reduction effect) is acquired.

  Furthermore, since the thickness P of the disposing material 4 is set in consideration of the balance between the ground supporting force and the ground pressure, a better effect of reducing the ground subsidence and vibration can be obtained.

  Conventionally, when determining the thickness of the arrangement material, simply calculate the average unit weight of the building (total weight of the building divided by the area of the foundation) as described above, and this value is the minimum value of the ground bearing capacity that can be found in the ground survey. Since the thickness of the arrangement material is determined by examining whether or not it is smaller than that, there is a high possibility that an accident of compression settlement occurs.

  Therefore, the present inventor has conducted earnest research on this problem, and as a result, obtained the ground pressure at a plurality of locations of the building 1 from the centroid and the center of gravity of the building 1, Compared with the obtained ground support force, and at least if the relationship of ground support force <ground pressure is established even at one location, the formula “(ground pressure−ground support force) ÷ (ground unit weight−unit weight of installation material 4” ”), A setting method that can set the best thickness P of the disposing material 4 in consideration of the balance between the ground supporting force and the contact pressure, that is, the setting of the thickness P of the disposing material 4 is found.

  When the present inventor actually provided the disposing material 4 having a thickness P obtained from the setting method according to the present invention described above under the foundation 2 of the building 1, the compression that has occurred in the conventional example is performed. It has been confirmed that settlement can be prevented and a good vibration reduction effect can be obtained.

  As described above, the present invention can obtain the optimum thickness P for the arrangement material 4.

  Further, when the base portion 2 provided above the placement material 4 is provided with a hanging portion 2a that contacts the placement material 4, the building 1 is placed inside the hanging portion 2a. A disposing material 3 made of a member having a specific gravity smaller than that of the ground is disposed, and a height H (space of the disposing material 3) inside the hanging portion 2a where the disposing material 3 is disposed. The (thickness) is set such that the deviation rate (eccentricity) between the rigid center and the center of gravity on the first floor of the object 1 is 0.3 or less.

  In the present invention, since the height H of the space inside the hanging portion 2a where the disposing material 3 is disposed is set in consideration of the weight balance of the building, the foundation structure in which building deformation is unlikely to occur. In addition, since the disposing material 3 is disposed, the disposing material 4 together with the disposing material 4 can be efficiently and surely provided with a thickness below the base portion 2. A reduction effect and a settlement prevention effect can be obtained better.

  Specific embodiments of the present invention will be described with reference to the drawings.

  In the present embodiment, an arrangement material 4 having a shape in plan view that is the same as or larger than the outer edge of the foundation portion 2 is provided on the entire lower surface of the foundation portion 2 of the building 1. In addition, the arrangement | positioning material 4 may arrange | position the some arrangement | positioning material 4 over a predetermined space | interval not only when arrange | positioning on the whole lower surface of the base part 2, for example.

  This disposing material 4 is a member having a specific gravity smaller than that of the ground on which the building 1 is installed and is formed in a panel shape with a foamed resin member having a gap inside. It has a shape (a rectangular parallelepiped), and its front and back surfaces are formed as flat surfaces.

  In the present embodiment, EPS (bead method polystyrene foam) using polystyrene resin and a foaming agent such as butane and pentane as main raw materials is employed as the foamed resin member constituting the disposing material 4.

The foamed resin material is not particularly limited as long as it is lightweight and has a necessary compressive strength. Polystyrene, polypropylene, polyethylene, polyurethane, polyvinyl chloride, and the like are conceivable. The compressive strength of the foamed resin material is generally 3 to 25 t / m ² although the structure of the building varies depending on the wooden structure, reinforced concrete, reinforcing bar, etc., and the expansion ratio is generally 10 to 60 times. is there.

  In addition, the thickness P of the disposing material 4 is of course less than necessary, and it is said that excessive thickness is not good (if the disposing material 4 is too thick, it is too light and has buoyancy. In this embodiment, the thickness P of the arrangement material 4 is obtained from the centroid and the center of gravity of the building 1 to obtain the ground pressure at a plurality of locations of the building 1, and the ground pressure at the plurality of locations is determined. And the ground support force determined in advance at the location, and if at least the relationship of ground support force <ground pressure is established even at one location, the following equation 1 is set.

Formula 1
(Ground pressure-ground bearing capacity) ÷ (ground unit weight-unit weight of installation material 4)
Hereinafter, a method for setting the thickness P of the arrangement material 4 will be specifically described with an example. Basic information for setting the thickness P of the disposing material 4 is as follows (the following a) to d) (note that the height H of the space in which the disposing material 3 described later is disposed (arrangement material) 3) is the same as the basic information.

B) The shape of the building The plane shape shown in Fig. 4 (the first floor is 3m x 6m, the second floor is 3m x 3m)
The elevation is illustrated in FIG. 5 (the first floor portion is 3 m × 6 m, the second floor portion is 3 m × 3 m).

B) The weight tile roof (tile), the outer wall (siding) such finishes and 800 N / ^{m 2,} the siding and 500 N / ^{m 2.}

C) Ground bearing capacity As shown in Fig. 6, the ground part corresponding to the four corners of the building 1 is calculated by ground survey.

D) Building weight The total weight is 217.8 kN (12.1 kN / m ² ), the second floor weight is 43.2 kN, the first floor weight is 66.6 kN, and the foundation weight is 108 kN.

  Next, a specific procedure regarding the setting of the thickness P of the arrangement material 4 will be described based on the flowchart shown in FIG.

a) Calculation of the centroid of the building The centroid of the building is calculated by the following equation 2, and in this embodiment, the first floor portion is 3.0 m in the X direction.
・ The position in the Y direction is 1.5m, and the second floor is the position in the X direction 1.5m and the Y direction 1.5m. This centroid is indicated by the X and Y distances from the base point, with the lower left corner of the building as the base point 0.

Formula 2
(Centroid of building) = (first moment of section) ÷ (area)
b) Calculation of the center of gravity of the building The center of gravity of the building is calculated by the following equation 3, and in this embodiment, the first floor portion is 2.5 m in the X direction.
・ The position in the Y direction is 1.5m, and the second floor is the position in the X direction 1.5m and the Y direction 1.5m. The center of gravity is indicated by the distance in the X and Y directions from the base point, with the lower left corner of the building as the base point 0.

Formula 3
(Center of gravity of the building) = (first moment of section) ÷ (weight)
c) Calculation of building ground pressure in consideration of centroid and center of gravity Building ground pressure is calculated by the following equation (4).
The ground contact pressure at the corner of the floor) is 18.1 kN / m ² , the one-story one-story part (1
The ground contact pressure at the ^two corners in the part where only the floor exists) is 6.05 kN / m ² .

Formula 4
(Maximum contact pressure σmax) = (αx + αy−1) × σf
(Minimum contact pressure σmin) = (3-αx−αy) × σf
f: Average contact pressure (total weight / basic area)
αx: Contact pressure coefficient in x direction (variable depending on location)
αy: Ground pressure coefficient in y direction (variable depending on location)
d) Comparison between the contact pressure calculated in c) and the ground support force The contact pressure at a plurality of locations is compared with the ground support force determined in advance at the locations.

In this example, when the ground pressure of each part is compared with the ground support force, the two-story part is arranged because the ground pressure (18.1 kN / m ² )> the ground support force (15 kN / m ² ). Construction material 4 is required, and the ground floor part has a ground pressure (6.05 kN / m ² ) <ground bearing capacity (13 k
N / m ² ), the disposing material 4 is unnecessary.

e) Setting of the thickness P of the disposing material 4 at the location where the relationship of ground supporting force <ground pressure is established in d) The thickness P of the disposing material 4 is calculated by the following equation 1, 3.1 kN / m ² ÷
15.8 kN / m ³ = 0.20 m.

Formula 1
(Ground pressure-ground bearing capacity) ÷ (ground unit weight-unit weight of installation material 4)
f) Setting of the thickness P of the arrangement material 4 at the location where the relationship of ground support force <ground pressure is not established in d) above. Ground support force−ground pressure = 6.95 kN / m ² (no shortage) Although the installation material 4 is not necessary, the arrangement material 4 arranged below the foundation 2 of the building 1 is basically unified to the maximum thickness.
. 2m. In addition, the thickness P of the arrangement | positioning material 4 may be adjusted by examination of the immediate subsidence mentioned later.

g) Examination of immediate subsidence e). The arrangement material 4 calculated by the calculation of f) has no problem in calculation, but the contact pressure (
(Pressure) Immediate settlement due to uneven balance (subsidence due to shrinkage of the ground) may occur.

In other words, even if there is no problem with the ground pressure, some settlement (shrinkage) occurs due to the weight of the building due to the nature of the ground. If the building's ground pressure (pressure) balance is uneven, it may cause uneven settlement. The amount of immediate settlement is calculated by the following formula 5.

Formula 5
Immediate settlement amount Se = qB (1-v ² ) / EIs
q: Average load of foundation (kN / m ² )
B: Length of short side of base bottom, diameter (m) if circular
v: Ground boisson ratio (dimensionless)
E: Elastic modulus of ground kN / m ²
Is: subsidence coefficient Using this equation, the amount of immediate subsidence at the four corners of the building is calculated (see FIG. 8).

Calculate the slopes of the six distances connecting all four corners of the building and the instantaneous settlement of each point, and confirm that the tolerance is 3/1000 or less (the tolerance is arbitrarily defined).

h) Reexamination of the thickness P of the disposing material 4 If the inclination due to the subsidence exceeds the allowable value by the examination of the immediate subsidence in the above g), the thickness P of the disposing material 4 is reexamined and within the allowable value To be.

The thickness P of the disposing material 4 is reviewed, and the settling is suppressed by appropriately adjusting the thickness P of the disposing material 4 as shown in FIGS. As shown in FIG. 15, the settlement can also be suppressed by setting the shape of the base 2. Further, as shown in FIG. 24, the height H of the inner space of the hanging portion 2a where the later-described arrangement member 3 is arranged is appropriately changed within an allowable value, and the thickness P of the arrangement member 4 is changed. There is also a method of keeping the immediate settlement within the allowable value without changing.

  The arrangement material 4 described above has the best thickness P in consideration of the balance between the ground support force and the contact pressure, and mainly exhibits the effect of absorbing vibrations such as earthquakes and traffic vibrations and the effect of preventing compression settlement. .

  In addition, earthquakes are caused by the occurrence of P-waves (longitudinal small vibrations transmitted in the earliest direction), S-waves (large horizontal vibrations transmitted next to P-waves), and surface waves (finally transmitted P-waves and S-waves). (Sway transmitted to the ground surface due to interference) occurs, and by providing the disposing material 4 below the base portion 2, any of these swings can be dealt with.

  FIGS. 25 and 26 show the results of an experiment for confirming the vibration absorption effect by the arrangement material 4 (an experiment in which an experimental building is built and vibration is actually applied by a vibration generator). When the material 4 is provided, the vibration in the vertical direction and the vibration in the horizontal direction are attenuated by about 60% on average as compared with the case where the material 4 is not provided. Note that the attenuation is about 70% when only the vertical direction is viewed.

  Further, in this embodiment, the base portion 2 provided above the placement material 4 is provided with a hanging portion 2a that contacts the placement material 4, and inside the hanging portion 2a, Arrangement material 3 is arranged.

  This arrangement material 3 is a member having a specific gravity smaller than that of the ground on which the building 1 is installed, as in the arrangement material 4 described above, and a foamed resin member having a void inside formed in a panel shape. This arrangement | positioning material 3 is a planar view shape, The front and back are formed in the flat surface.

  In the present embodiment, as the foamed resin member constituting the disposing material 3, the same EPS (bead method polystyrene foam) as the disposing material 4 described above is adopted.

  In addition, the height H (the thickness of the arrangement material 3) of the space inside the hanging portion 2a where the arrangement material 3 is arranged is a deviation between the rigid center and the center of gravity on the first floor of the building 1. The rate (eccentricity) is set to be 0.3 or less.

  Hereinafter, a method for setting the height H of the space in which the disposing material 3 is disposed (thickness of the disposing material 3) will be described with an example. The basic information when setting the height H of the space inside the hanging portion 2a where the disposing material 3 is disposed is the same as the basic information when setting the thickness P of the disposing material 4 described above. To do.

  A specific procedure regarding the setting of the height H (the thickness of the placement material 3) of the space inside the hanging portion 2a where the placement material 3 is placed will be described based on the flowchart shown in FIG. To do.

i) Calculation of stiffness on the first floor of the building The stiffness of the building is calculated by the following equation (6). In this embodiment, the position shown in FIG. (0m position, 2nd floor part is 2.5m in the X direction and 2m in the Y direction).

Equation 6
(Stiffness of the building) = (ΣD, center of gravity) ÷ ΣD
ΣD: Horizontal rigidity D: Strength value of bearing wall (muscle) j) Calculation of the center of gravity in the foundation of the building
5 m and Y direction 1.5 m.

Equation 7
(Center of gravity at the foundation of the building) = (Cross section first moment) / (Weight)
k) Calculation and Examination of Eccentricity The eccentricity between the first-floor stiffness and the center of gravity of the foundation is calculated by the following formula 8, and in this embodiment, in the first floor of the building calculated in i) above Calculate the eccentricity between the center of gravity and the center of gravity of the foundation of the building calculated in step j) above, and examine whether this eccentricity is within an allowable value of 0.3.

As shown in FIG. 11, the eccentricity of the building 1 is the center (rigidity) of the strength (resistance) of the building 1 calculated by the following formula taking into account the structure of the outer walls and columns. K2 and center of gravity G1. G
2 is calculated by a calculation method for obtaining a deviation rate of 2. As shown in FIG. 12, the deformation (swing) of the building 1 increases as the distance (eccentric distance) between the rigid center and the center of gravity of the building 1 increases.

Equation 8
(Eccentricity of building) = e / γe
e: Eccentric distance (distance between the center of gravity and rigid center)
γe: Elastic radius l) Setting of height H (thickness of arrangement material 3) where the arrangement material is arranged When the eccentricity calculated in k) is larger than the allowable value 0.3, The height H of the space (the thickness of the arrangement material 3) is changed so that the center of gravity of the foundation portion approaches the rigid center of the building.

When the eccentricity calculated in k) is within an allowable value of 0.3, the height H of the space (the thickness of the arrangement material 3) is determined as designed.

  The height H of the space determined as described above is the best height H in consideration of the weight balance of the building, and the earthquake is performed so that the deviation between the rigid center and the center of gravity of the building 1 becomes as small as possible. The effect which prevents the deformation | transformation of the building 1 by, and the effect etc. which prevent a compression subsidence similarly to the said arrangement | positioning material 4 are exhibited.

  Next, the foundation structure of the building 1 according to the present embodiment is constructed as follows.

  As shown in FIG. 1, the ground 5 is excavated, and subsequently, panel-shaped disposing materials 4 and 3 set in advance in a predetermined shape, predetermined thickness and predetermined compressive strength are laid in the excavation hole 6 at a factory. . When laying the disposing material 4, a plurality of disposing materials 4 are arranged at predetermined intervals as shown in FIG. 22 in addition to a case where the disposing materials 4 are disposed so as to contact each other. In some cases, the disposing material 3 is not disposed as shown in FIG. 23, and only the disposing material 4 is disposed. In addition, you may make it the arrangement | positioning materials 4 and 3 arrange | position and form on the spot.

  Subsequently, as shown in FIG. 2, a concrete material is placed on top of the placement members 4 and 3 to form the foundation portion 2. Moreover, the site | part in which the base part 2 in the excavation hole 6 is not formed is backfilled. Reference numeral 2a denotes a suspended portion (common name: underground beam) suspended from the lower surface of the base portion 2. In addition, as the shape of the base part 2, as shown in FIGS. 16, 17, 18 and 19, the structure without the hanging part 2a at the lower part of the base part 2, the reverse solid base structure shown in FIG. There are shapes that make up the illustrated 3.3 fabric foundation structure.

  Subsequently, as shown in FIG. 3, the building 1 is constructed on the foundation 2.

  Since the present embodiment is configured as described above, the disposing material 4 having the thickness P calculated by the above-described present embodiment is provided below the foundation portion 2 of the building 1, and the disposing material 4 and the foundation are further provided. When the arrangement material 3 is arranged between the unit 2 and the best vibration reduction effect (vibration reduction effect) that meets the conditions, it is possible to obtain vibrations such as earthquakes and traffic vibrations. The effect of absorbing, the effect of preventing ground destruction and uneven settlement, and the effect of preventing the deformation of the building 1 due to earthquake by making the deviation between the rigid center of the building 1 and the center of gravity as zero as possible become.

  Note that the present invention is not limited to this embodiment, and the specific configuration of each component can be designed as appropriate.

It is explanatory drawing of the construction example of a present Example. It is explanatory drawing of the construction example of a present Example. It is explanatory drawing of the construction example of a present Example. It is a top view of a building. It is an elevation figure of a building. It is explanatory drawing which shows the ground supporting force of a building. It is the flowchart which showed the procedure which sets the thickness of the arrangement | positioning material. It is explanatory drawing which shows the amount of settlement of 4 corners of a building. It is the flowchart which showed the procedure which sets the height of the space where the arrangement | positioning material 3 is arrange | positioned. It is explanatory drawing which shows the rigid center of a building. It is explanatory drawing which shows the rigid center and gravity center of a building. It is explanatory drawing which shows building deformation | transformation by the shift | offset | difference of the rigid center of a building and a gravity center. It is explanatory drawing of another construction example. It is explanatory drawing of another construction example. It is explanatory drawing of another construction example. It is explanatory drawing of another construction example. It is explanatory drawing of another construction example. It is explanatory drawing of another construction example. It is explanatory drawing of another construction example. It is explanatory drawing of another construction example. It is explanatory drawing of another construction example. It is explanatory drawing of another construction example. It is explanatory drawing of another construction example. It is explanatory drawing of another construction example. It is a result figure of a vibration experiment. It is a result figure of a vibration experiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Building 2 Foundation part 2a Hanging part 3 Arrangement material 4 Arrangement material

Claims (5)

A building foundation structure in which one or a plurality of disposing materials are provided below the foundation of the building, the outer edge of which is the same as the outer edge of the foundation or the outer edge extending outward from the outer edge of the foundation. The arrangement material is composed of a member having a specific gravity smaller than that of the ground on which the building is installed, and the thickness P of the arrangement material is set as follows. The basic structure of the building.
Thickness P: The ground pressure at a plurality of locations of the building is obtained from the centroid and the center of gravity of the building, and the ground pressure at the plurality of locations is compared with the ground support force obtained in advance at the location, When the ground pressure relationship is established only at one location, the thickness P is set by the following equation 1, and when the ground support force <the ground pressure relationship is established at multiple locations, the thickness is set by the following equation 1. The maximum value of each thickness is set as the thickness P.
Formula 1
(Ground pressure-Ground bearing capacity) ÷ (Unit weight of ground-Unit weight of installed material)   The building foundation structure according to claim 1, wherein the disposing material is one or a plurality of planar-view bodies provided on the entire lower surface of the foundation portion of the building. The building foundation structure according to any one of claims 1 and 2, wherein the foundation portion provided above the arrangement material is provided with a hanging portion that contacts the arrangement material. An arrangement material made of a member having a specific gravity smaller than that of the ground on which the building is installed is arranged inside the installation part, and the inside of the installation part in which the installation material is arranged The basic structure of the building is characterized in that the height H of the space is set as follows.
Height H: It is set so that the deviation rate (eccentricity) between the rigid center on the first floor of the building and the center of gravity of the foundation is 0.3 or less.   The building foundation structure according to any one of claims 1 to 3, wherein the two disposing members are formed of members having voids therein. 5. The basic structure of a building according to claim 4, wherein a foamed resin material is employed as the member having a gap inside.

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