JP4402983B2 - Building foundation and its construction method - Google Patents

Description

  The present invention relates to a building foundation and a construction method thereof, and more particularly, a foundation having a foamed resin board and a solid foundation, and a load distribution effect from a vertical direction mainly including a building load. The present invention relates to a foundation structure for a building which is excellent and has improved earthquake resistance and its construction method.

  Conventionally, there is a problem that the same settlement or non-settlement occurs in a building. One cause of the occurrence of the same or non-settlement of the building is the consolidation settlement of the ground caused by the ground located under the building being compressed downward in the load of the building. In general, when the ground below the building is weak on average, the same subsidence occurs, and the part of the ground located below the building is particularly weak or the load on the part of the building is particularly large In particular, there is a strong tendency for uneven settlement. In such a case, by adopting a solid foundation as a concrete foundation, a method of dispersing the load unevenness of the building and reducing the burden on the ground has been taken. However, it was not sufficient as an effect of preventing uneven settlement.

  As a further measure against the same or non-subsidence of the above-mentioned building, a basic structure that employs a lightweight ground replacement structure in which part of the ground located below the building is replaced with a foam resin that is lightweight and has high compressive strength has been proposed. (For example, Patent Document 1). As shown in FIG. 11, the foundation structure in which the lightweight ground replacement structure is employed is formed with a ground layer 23 in which gravel or the like is laid in holes formed in the ground, and a foamed resin board 22 is embedded thereon, Furthermore, a solid foundation 21 formed integrally with the foamed resin board 22 is a conventional foundation structure 20 for a building in which the upper surface of the foamed resin board 22 is formed. In the basic structure 20, the planar interface 24 is formed between the upper surface of the foamed resin board 22 and the lower surface of the solid base 21.

In the conventional foundation structure 20, a part of earth and sand constituting the ground located below the building is discharged, and a foamed resin board 22 having high compressive strength is embedded to replace the discharged earth. Therefore, compared with the ground consisting only of earth and sand before the replacement, the ratio of the ground being compressed due to the load of the building is significantly reduced due to the strong compressive strength of the foamed resin board 22 as the replacement ground. . Moreover, since the foamed resin board 22 is light compared with the weight of the earth and sand discharged | emitted, the load reduction effect to the ground located under the foamed resin board 22 arises, and the compression settlement of the ground is reduced. Accordingly, as a whole, the foundation structure 20 can prevent or reduce consolidation settlement of the ground located below the building, and as a result, can prevent or reduce the same settlement or non-settlement of the building. is there.
Japanese Patent Laid-Open No. 9-273160

  However, the conventional foundation structure 20 has the following problems.

  In general, when there is a significant bias in the load of the building, the tendency of the uneven settlement of the building is strong as described above. In order to prevent or reduce this, it is necessary to disperse the load bias between the building and the ground, and to reduce the burden on the ground located below the building. For this reason, a solid foundation having a large area in contact with the building and the ground, or a foundation structure 20 including a solid foundation 21 and a foamed resin board 22 which is a lightweight replacement ground is used.

  However, the above-mentioned unsettled settlement is not only due to the building load and ground strength at the time of building design, but also due to changes in the ground environment that occur over time and changes in the location environment, including ground liquefaction that occurs during earthquakes, etc. Etc. may arise from. Therefore, there has been a demand for a building foundation that can disperse uneven loads in the building.

  In addition, in the planar interface 24 in the conventional foundation structure 20, when vibration is generated in the ground due to an earthquake or traffic vibration, the reflection and attenuation effects on the ground are not sufficient. That is, since the interface 24 is flat, when vibration is transmitted from the ground, the ratio of the vibration reflected to the interface 24 is low, and the vibration damping effect obtained between the foamed resin board and the solid foundation is also low. There was a certain limit. Further, when the vibration transmitted to the building is shaken back, there is a certain limit to the damping effect of the vibration shaken back between the foamed resin board and the solid foundation for the same reason as described above.

  The present invention has been made to solve the above-described problems, and can favorably disperse the load of the building as compared with the conventional foundation structure 20, and the foamed resin board and the solid foundation can be dispersed. It is an object of the present invention to provide a foundation structure for a building that is excellent in reflection and damping effects of vibrations and a construction method thereof.

  The present invention employs the following means in order to solve the above problems.

That is, the present invention has a foamed resin board embedded in a hole formed by discharging the ground, and a solid foundation formed integrally with the foamed resin board on the top surface of the foamed resin board. And two or more protrusions substantially formed by the presence of two or more protrusions on the top surface of the foamed resin board or three or more recesses confirmed in a vertical cross section of the foamed resin board (the protrusions, Or a convex portion that is substantially formed by the presence of the concave portion except that having an air layer) is continuously formed, and the lower surface of the solid base is formed on the upper surface of the foamed resin board. By being formed so as to be in contact with two or more convex portions or concave portions, an interface having two or more continuous uneven-shaped surfaces is formed between the upper surface of the foamed resin board and the lower surface of the solid base. Features that The building substructure that it is an gist.

Here, the concavo-convex shape in the present invention means any shape of a concave portion, a convex portion, or a combination of the concave portion and the convex portion provided intentionally (however, the convex portion or the concave portion). Excluding those having an air layer in the convex portion substantially formed by the presence) .

  In this invention, it can also be set as the foundation structure for buildings characterized by at least one part of the corner formed from the side surface and upper surface of the said foamed resin board being chamfered.

  Moreover, in this invention, the said foamed resin board can also be set as the foundation structure for buildings characterized by consisting of the foamed resin concrete part and foamed resin block which are formed from foamed resin concrete.

Furthermore, the present invention includes a step of placing a foamed resin block to form a foamed resin disc in a hole formed by discharging the ground, and then a step of pouring concrete to form a solid foundation. In the construction method of a building foundation, the foamed resin board is substantially formed by the presence of two or more convex parts on the upper surface or three or more concave parts confirmed in a vertical section of the foamed resin board. 2 or more protrusions (the convex portion, or substantially excluding those having an air layer in the convex portion formed by the presence of the recess) used as the continuously provided with concrete from the top of the foamed resin board by forming a solid foundation is poured, thereby forming an interface having two or more continuous uneven surface between the lower surface of the upper surface and the solid basis of the resin foam board Method of constructing a building substructure, characterized the door is to the subject matter of.

Still further, the present invention provides a building foundation structure having a step of forming a foamed resin board in a hole formed by discharging the ground, and then a step of pouring concrete to form a solid foundation. In the construction method, the foamed resin concrete is formed by pouring and curing the foamed resin concrete in the hole, and the foamed resin block is placed on the upper surface by placing two or more foamed resin blocks on the upper surface of the foamed resin concrete portion. Forming a foamed resin board provided with two or more continuously formed convex parts (except those having an air layer) , and then pouring concrete from above the foamed resin board to form a solid foundation by forming an interface having two or more continuous uneven surface between the lower surface of the upper surface and the solid basis of the resin foam board Method of constructing a building substructure, characterized the door is to the subject matter of.

According to the present invention, two or more convex portions or concave portions are provided on the upper surface of the foamed resin board, and a solid base is formed integrally with the foamed resin board on the upper surface of the foamed resin board, whereby the upper surface of the foamed resin board is formed. Two or more concavo-convex shaped surfaces are formed at the interface formed by the bottom surface of the solid base. The interface having such a concavo-convex surface has a larger interface area than the planar interface 24 in the conventional basic structure 20. Thereby, when the load of the building is transmitted from the solid foundation to the foamed resin board, the load of the building can be well dispersed and transmitted to the foamed resin board. As a result, the load of the building can be well dispersed from the foamed resin board to the ground.

  Therefore, even if the building has a biased load, if the foundation structure of the present invention is used, the load bias of the present invention described above can be distributed and transmitted to the ground in a well distributed manner. Can do. As a result, the load due to the local concentration of the load on the ground located below the foundation structure is reduced, and the uneven settlement caused by the uneven load of the building can be prevented or reduced.

  In addition, since the basic structure of the present invention includes the interface having the uneven surface, the reflection and damping effect of vibration is very excellent, and thereby the influence of vibration on the building can be remarkably reduced. That is, the amount of vibrations reflected by hitting the interface having the concavo-convex surface increases as compared with the case where the vibration is transmitted to the planar interface. Further, the reflected vibration and the vibration that enters with a delay interfere with each other, and part of the vibration wave disappears before being transmitted to the building. In addition, since the area of the interface having the concavo-convex surface is larger than that of the planar interface, the damping effect of vibration generated when vibration transmitted to the building passes through the interface is expanded. Similarly, when the vibration transmitted to the building is shaken back, the damping effect of the vibration is expanded. As a result, the vibration transmitted to the building is reduced and the magnitude of the transmitted vibration can be reduced.

  In addition, in the foundation structure for a building of the present invention using the foamed resin board with the chamfered corners composed of the side surface and the upper surface, the area of the interface consisting of the foamed resin board and the solid foundation is further expanded, and the above load distribution The effect is improved. In addition, since the chamfering results in an increase in the area of the side surface of the foamed resin board, the proportion of the building load transmitted from the vertical direction in the foamed resin board in the horizontal direction is also improved.

Moreover, according to the construction method of the foundation structure for a building of the present invention, the foamed resin board having two or more convex parts or concave parts on the upper surface is buried in the hole, and concrete is placed on the foamed resin board. By forming a solid base integrally with the foamed resin board, it is possible to easily form two or more uneven surfaces on at least a part of the interface formed by the upper surface of the foamed resin board and the lower surface of the solid base. Can do. As a result, the area of the interface can be easily expanded.

Furthermore, according to another construction method of the basic structure of the present invention, the foamed resin board in which two or more uneven shapes are formed on the upper surface by combining the foamed resin concrete part and the foamed resin is embedded in the hole, By placing concrete on the foamed resin board and forming a solid foundation integrally with the foamed resin board, at least part of the interface formed from the upper surface of the foamed resin board and the lower surface of the solid foundation, Two or more uneven surfaces can be easily formed. As a result, the area of the interface can be easily expanded.

  In the construction method of the present invention using the foamed resin concrete, it is not necessary to transport a large amount of the foamed resin block constituting the foamed resin board to the construction site. That is, in the construction method of the present invention, the foamed resin concrete is transported to the construction site by a mixer car, or it is transported to a place where it is placed by a unicycle etc. It is only necessary to form the foamed resin concrete part to be constructed and to transport only the foamed resin block constituting the remaining part of the foamed resin board to the construction site, thereby reducing part of the labor in the transportation and construction of the foamed resin block. can do.

  The best mode for carrying out the present invention will be described below with reference to the drawings illustrating the present invention.

  FIG. 1 is a schematic vertical sectional view of the basic structure A1 of the present invention. In the basic structure A1 shown in FIG. 1, a ground layer 4 is formed by spreading gravel or the like in a hole formed by discharging the ground, and then a concave portion 5 composed of a slope 6 and a bottom surface 7 is formed on the upper surface. The foamed resin board 3a is formed by placing the formed foamed resin block on the base layer 4, and the concrete is formed on the upper surface of the foamed resin board 3a to be formed integrally with the foamed resin board 3a. It can be formed by providing a solid base 2. An uneven surface formed by the recesses 5 is formed at the interface formed by the upper surface of the foamed resin board 3a and the lower surface of the solid base 2 in the base structure A1 thus formed. FIG. 2 is a perspective view of the foamed resin board 3a of the present invention shown in FIG. Note that GL described in this specification indicates a ground level.

  FIG. 3 is a schematic vertical sectional view of a foundation structure A2 which is another embodiment of the building foundation structure of the present invention, and FIG. 4 is a perspective view of the foamed resin board 3b in the foundation structure A2. The base structure A2 can be formed in the same manner as the base structure A1 except for the corrugated uneven shape including the concave portions 8 and the convex portions 9 provided on the upper surface of the foamed resin board 3b.

  FIG. 5 is a schematic vertical sectional view of a foundation structure A3 which is another embodiment of the building foundation structure of the present invention, and FIG. 6 is a perspective view of the foamed resin board 3c in the foundation structure A3. In order to form the foundation structure A3, first, the foundation layer 4 is formed in the hole formed by discharging the ground, and the rectangular parallelepiped foamed resin block 10 is placed in two stages on the foundation layer 4. Subsequently, the trapezoidal block 11 is used, and the foamed resin board 3c is formed by continuously placing the trapezoidal blocks 11 in contact with each other on the vertical side surfaces of the block 11 with an equal interval between the inclined side surfaces. The foundation structure A3 can be formed by providing the solid foundation 2 formed integrally with the foamed resin board 3c by placing concrete on 3c. On the upper surface of the foamed resin board 3c, a convex portion 12 composed of the foamed resin block 11 is provided.

  FIG. 7 is a schematic vertical sectional view of a foundation structure A4, which is another embodiment of the building foundation structure of the present invention, and FIG. 8 is a perspective view of a foamed resin board 3d in the foundation structure A4. The foundation structure A4 is the same as the building foundation structure A1 shown in FIG. 1 except that the corner formed from the side surface and the upper surface of the foamed resin board 3d is chamfered and the inclined surface 13 is formed around the upper surface. Can be formed.

  FIG. 9 is a schematic vertical sectional view of a foundation structure A5 which is another embodiment of the building foundation structure of the present invention, and FIG. 10 is a perspective view of the foamed resin board 3e in the foundation structure A5. In order to form the foundation structure A5, first, the foundation layer 4 is formed in the hole formed by discharging the ground, and the foamed resin concrete is poured and cured thereon to form the foamed resin concrete portion 14. Next, the foamed resin board 3e is formed by placing the trapezoidal foamed resin blocks 15 on the upper surface of the foamed resin concrete part 14 at equal intervals, and the concrete is placed on the foamed resin board 3e to form the foamed resin board 3e. The foundation structure A5 can be formed by providing the solid foundation 2 that is integrally formed. On the upper surface of the foamed resin board 3e, a convex portion 16 composed of the foamed resin block 15 is provided.

  The foamed resin board in the present invention may be formed from one foamed resin block, or may be formed by combining a plurality of foamed resin blocks. That is, in the former case, the shape of one foamed resin block is the shape of the foamed resin board, and in the latter case, the shape formed by the combination of a plurality of foamed resin blocks is the shape of the foamed resin board. . Specifically, the foamed resin board in the present invention may be formed from, for example, one foamed resin block like the foamed resin board 3a shown in FIG. 1, or foamed like the foamed resin board 3c shown in FIG. A plurality of foamed resin blocks such as the resin block 10 and the foamed resin block 11 may be formed in combination. In the method of forming a foamed resin board by combining the plurality of foamed resin blocks, the foamed resin block is formed in an arbitrary size and shape so that the foamed resin block can be easily transported to the construction site and placed in the hole. can do. Therefore, when building a base structure with a large volume of foamed resin board, such as when handling the foamed resin block is easy and the bottom area of the building is wide or when the thickness of the foamed resin board is thick, etc. Is particularly preferred.

  Or the foamed resin board of this invention can also be formed using foamed resin concrete and a foamed resin block. For example, one foamed resin board 3e can be formed as a whole by combining the foamed resin concrete portion 14 and the foamed resin block 15 as in the foamed resin board 3e shown in FIG. In such a method for forming a foamed resin board, first, the foamed resin concrete is transported to the vicinity of a construction site, and the foamed resin concrete is poured into a hole formed in the ground and cured to be a part of the foamed resin concrete part. Form. Next, the foamed resin block may be transported to the construction site for the remaining part of the foamed resin board. The method using the foamed resin concrete can reduce the handling amount of the foamed resin block than the method of forming the foamed resin board using only the foamed resin block, and the labor of transporting and placing the foamed resin block is reduced. It is excellent in that it can be reduced. In addition, foamed resin concrete can obtain high compressive strength within an appropriate weight range, so when building on a land where liquefaction is expected to occur, Even in the case of building a very heavy large building, it is preferable to use a foundation structure having a foamed resin concrete portion.

As the foamed resin block, it is preferable to use a lightweight and necessary compressive strength. Specifically, the weight per unit of the foamed resin block is preferably 14 kg / m ^{3 to} 100 kg / m ³ , and the compressive strength is preferably ^{3 to} 50 t / m ² . However, since the load of the building is remarkably different depending on the structure of the building such as wooden, reinforced concrete, or steel frame, the range of weight and compressive strength per unit is not limited to the above range.

  In addition, the compressive strength of the foamed resin block described in this specification can be measured using a short-term compressive strength measuring method shown in JIS K7220.

  Moreover, although the preferable foaming ratio of the foam used for the foamed resin block of this invention is 10 times-60 times generally, it is not limited to this. In view of easily obtaining an appropriate compressive strength, it is preferable to set the expansion ratio within 60 times. In addition, it is preferable to set the foaming ratio to 10 times or more from the viewpoint that the effect of replacement with earth and sand can be sufficiently exhibited and a desirable lightweight ground can be designed. The expansion ratio can be adjusted as appropriate during foam formation.

  Examples of the foam used for the foamed resin block include a polystyrene resin foam, a polyethylene resin foam, a polypropylene resin foam, a polyurethane resin foam, a polyvinyl chloride resin foam, and a thermoplastic polyester series. Examples thereof include a resin foam, a polycarbonate resin foam, a polyamide resin foam, a polyphenylene ether resin foam, or a mixture of two or more of the above-described resins. In particular, a polystyrene resin foam, a polyethylene resin foam, and a polypropylene resin foam are preferable in terms of weight and strength. Polyurethane resin foams may deteriorate in durability when hydrolysis occurs in the ground. Polyvinyl chloride resin foams generate hydrochloric acid gas when burned, causing pollution problems. Therefore, when using these resin foams, it is necessary to pay attention not to cause the above problem.

  Specific examples of the polystyrene resin foam, which is one of the above preferred resin foams, include styrene homopolymer resins, styrene copolymer resins produced from styrene and other monomers, and styrene alone. A rubber-modified styrene resin (impact resistant) obtained by polymerizing a styrene monomer in the presence of a polymer resin or / and a mixture of a styrene copolymer resin and a styrene-butadiene block copolymer or a rubber-like polymer. A polystyrene-based resin or a polystyrene-based resin composition having a styrene component ratio of 50% by weight or more, such as a mixture of a styrene-based resin) or a mixture of the above-described styrene-based resin with another resin or / and a rubber-like polymer. Foams formed in this way are included.

  Specific examples of the polyethylene resin foam that is one of the preferred resin foams include ethylene homopolymer resins, ethylene copolymer resins produced from ethylene and other monomers, and ethylene alone A graft-modified ethylene resin obtained by impregnating a polymer resin or / and an ethylene copolymer resin with a vinyl monomer such as a styrene monomer and polymerizing, or the above-mentioned ethylene resin and another resin or / and rubbery heavy A foam formed by foaming a polyethylene resin or a polyethylene resin composition having an ethylene component ratio of 50% by weight or more, such as a mixture with a coalescence, is included.

  Specifically, a polypropylene resin foam, which is one of the preferred resin foams, includes a propylene homopolymer resin, a propylene copolymer resin produced from propylene and another monomer, and a propylene homopolymer. Graft modified propylene resin obtained by impregnating vinyl resin such as styrene monomer into polymer resin or / and propylene copolymer resin, or the above propylene resin and other resin or / and rubber-like polymer And a foam formed by foaming a polypropylene resin or a polypropylene resin composition having a propylene component ratio of 50% by weight or more.

  The foamed resin block is formed by a so-called bead foaming method in which spherical foamed particles are filled in a container formed in a desired shape and heated to fuse the foamed particles together. be able to. Alternatively, a desired shape can be obtained by filling spherical foamed particles in a suitably shaped container and heating them to fuse the foamed particles together to form a suitably shaped foamed resin block and then processing it into the desired shape. The foamed resin block having the shape can be formed.

The foamed resin concrete can be produced by mixing a resin foam and mortar. Specifically, for example, the foamed resin particles and water, or a resin-based adhesive such as polyethylene or acrylic are filled in a mixer and stirred to attach the water or the adhesive to the surface of the foamed resin particles. Let Subsequently, the foamed resin concrete can be produced by adhering the foamed particles and the mortar by gradually adding and stirring the mortar produced by kneading cement and sand with water into the mixer. However, the production method of the foamed resin concrete of the present invention is not limited to this, and it is a mixture of a resin foam and concrete, and when cured, it can produce a material exhibiting a desired compressive strength and weight. Any method that can be used can be used optionally. A preferable mixing ratio of the resin foam particles and the mortar is about 200 kg or more and about 800 kg or less of the mortar with respect to 1.1 m ³ of the resin foam particles before stirring with water or the like, but is not limited thereto, and the generated foam is generated. The mixing ratio can be appropriately adjusted so that the resin concrete has a desired compressive strength and weight. As a resin foam which comprises the said resin foam particle, the thing similar to the said resin foam which can be used for the foamed resin block of this invention can be used. The compression strength of the foamed resin concrete produced by the mixing is about 20 t / m ² or more and about 100 t / m ² or less after curing, and the weight per unit weight is about 200 kg / m ³ or more and about 1000 kg / m ³ or less. Although it is preferable, it is not limited to this.

  When a plurality of foamed resin blocks are combined to form one foamed resin board, each foamed resin block is a foamed resin block such as the type of foam used, formation method, specific gravity, compressive strength, and foaming ratio. The factors for identifying all may be the same, or any or all of these may be different. For example, the foamed resin block constituting the side surface of the foamed resin board and the foamed resin block constituting the inner portion may use foamed resin blocks having different foaming ratios, or the upper, middle and lower three-stage foamed resins. In the foamed resin board formed of blocks, foamed resin blocks having different foaming ratios may be used in the upper, middle, and lower stages. The same can be said for the foamed resin block for forming the foamed resin board in combination with the foamed resin concrete part.

  When a plurality of foamed resin blocks are combined to form a single foamed resin board, the plurality of foamed resin blocks may be simply arranged in a hole formed in the ground, or the blocks may be bonded arbitrarily. The foamed resin blocks may be bonded together by using an agent or by using a fixing tool such as a bolt. Further, when the foamed resin board is formed by combining the foamed resin concrete part and the foamed resin block, the foamed resin concrete part and the foamed resin block may be simply arranged in contact with each other, or the foamed resin concrete part and the foamed resin block may be arranged. The block may be bonded with an arbitrary adhesive, or a fixing tool such as a bolt may be provided in advance on the top surface of the foamed resin concrete portion, and then the foamed resin block may be fixed by the fixing tool.

  The shape of the foamed resin board of the present invention formed from the foamed resin block or the combination of the foamed resin block and the foamed resin concrete is as long as at least part of the upper surface is provided with an uneven shape. There is no particular limitation. Therefore, the shape can be appropriately determined depending on the structure and load of the building, the ground condition, the shape of the foundation to be adopted, and the like. In addition, the dimensions of the foamed resin board of the present invention having an arbitrary shape can be appropriately determined depending on the structure and load of the building, the state of the ground, the type of foundation to be adopted, etc. The preferred dimension is about 10 cm or more in thickness. It is about 200 cm or less. The area of the upper surface of the foamed resin board of the present invention is greater than 1.0 times and less than about 2.0 times the area of the lower surface of the solid base formed integrally with the foamed resin board. preferable. By designing the area of the top surface of the foamed resin board to be larger than 1.0 times the area of the bottom surface of the solid foundation, it is possible to prevent the building load transmitted from the solid foundation from concentrating in the foundation structure. It is preferable because the load can be dispersed, and by making the area 2.0 times or less, the load of the building can be favorably dispersed without economical disadvantage.

  Next, the uneven | corrugated shape provided in the upper surface of the foamed resin board used for this invention is demonstrated. In the present invention, the concavo-convex shape provided on the upper surface of the foamed resin board is a concave part, a convex part, or a combination of a concave part and a convex part intentionally provided on the upper surface of the foamed resin board. The shape and dimensions of the uneven shape are not particularly limited and can be any shape.

  As illustrated in the foamed resin board 3a, the uneven shape provided on the top surface of the foamed resin board of the present invention is obtained by forming a desired uneven shape on the top surface of the block in advance when forming the foamed resin block. It can be provided by placing in a hole and forming a foamed resin board. As another embodiment, as exemplified by the foamed resin board 3c, it is possible to form a foamed resin board having an uneven shape on the upper surface by combining a plurality of foamed resin blocks. As still another embodiment, as exemplified by the foamed resin board 3e, a foamed resin board having an uneven shape on the upper surface can be formed by combining the foamed resin concrete portion and the foamed resin block. In the present invention, by providing a concavo-convex shape on the top surface of the foamed resin board, at least a part of the interface consisting of the top surface of the foamed resin board and the bottom surface of the solid base formed integrally with the top surface of the foamed resin is uneven. It is important that the surface becomes a shape and, as a result, the area expands compared to a planar interface, thereby favorably distributing the building load transmitted from the solid foundation to the foamed resin board.

  As a concrete uneven | corrugated shape, there exists the recessed part 5 provided in the upper surface of the foamed resin board 3a shown by FIG.1 and FIG.2, for example. The concave portion 5 has a conical shape whose diameter is gradually reduced, and is formed by a slope 6 and a bottom surface 7 formed by cutting the conical shape in an horizontal direction at an arbitrary position. The slope of the slope 6 is not particularly limited and can be any angle, but the acute angle formed between the horizontal plane and the slope 6 is preferably about 15 ° to about 60 °, more preferably about 30 ° to about 45 ° or less. Moreover, although the diameter of the recessed part 5 can be determined suitably, Preferably, the diameter dimension in a foamed resin board surface is about 50 cm or more and about 100 cm or less. Further, the height from the surface of the foamed resin board to the bottom surface of the recess 5 is preferably less than the thickness of the foamed resin board and not less than about 10 cm and not more than about 100 cm.

  As another example of the irregular shape in the present invention, a corrugated irregularity comprising a concave portion 8 provided in the upper surface of the foamed resin board 3b in one direction and a convex portion 9 provided in parallel with the concave portion 8 is provided. There is a shape. Moreover, as another uneven | corrugated shape, there exists the convex part 12 provided in the foamed resin board 3c upper surface. The convex portion 12 is configured by using a foamed resin block 11 whose upper and lower surfaces are horizontal, whose side surfaces in the major axis direction are inclined surfaces, and whose side surfaces in the minor axis direction are vertical surfaces. That is, the convex portion 12 is formed by placing the foamed resin blocks 11 on the upper side of the upper stage of the foamed resin blocks 10 stacked in two steps and continuously contacting each other on the vertical side surfaces of the blocks in one direction. It is an uneven shape. Further, as another uneven shape, there is a convex portion 16 provided on the upper surface of the foamed resin board 3e. The convex portion 16 is formed by placing the foamed resin block 15 whose top and bottom surfaces are horizontal and whose four side surfaces are slopes independently on the top surface of the foamed resin concrete portion 14 at an arbitrary distance. is there.

  Furthermore, as one embodiment of the present invention, at least a part of the corner formed from the side surface and the upper surface of the foamed resin board in the present invention can be chamfered. Specifically, as shown in FIGS. 7 and 8, the inclined surface 13 can be formed by chamfering the corners forming the outer periphery of the upper surface of the foamed resin board 3d. As for the angle of the slope, the acute angle formed by the horizontal plane and the slope 13 is preferably about 15 ° to about 60 °, more preferably about 30 ° to about 45 °. The slope of this invention provided by chamfering can be provided in part or all of the outer periphery of the upper surface of a foamed resin board. In particular, it is preferable to provide the inclined surface on the entire outer periphery because the area of the interface formed by the upper surface of the foamed resin board and the lower surface of the solid base is further expanded, and the load distribution efficiency from the vertical direction is further improved. On the other hand, by providing the inclined surface on the entire outer periphery, the area of the four side surfaces of the foamed resin board can be increased as viewed from the horizontal direction, and the effect of dispersing the load in the horizontal direction can be improved, which is preferable. .

  The solid foundation in the present invention is a structural part provided to transmit the building load directly downward, and is a single foundation slab or a foundation structure that transmits the building load downward using a lattice beam and a foundation slab. That means. Generally, any solid foundation that can be used as a foundation of a building can be used as a solid foundation in the building foundation structure of the present invention.

  Next, the construction method of the present invention will be described in detail step by step using the basic structure A1 of the present invention shown in FIG.

  (1) Analyze the earthquake characteristics of the ground in the building, the planned construction site of the building, vibration data of traffic, etc., and determine the optimum dimensions, compressive strength, etc. of the solid foundation 2 and the foamed resin board 3a.

  (2) Excavate the ground where the building is planned to be built and form a hole. The size of the hole can be appropriately changed in accordance with the determined size of the basic structure A1, but in general, the depth is preferably about 30 cm or more and about 220 cm or less.

  (3) Gravel is spread on the bottom surface of the hole, and then the upper surface of the spread gravel is crushed with sand, mountain sand or the like, and further spread with a rammer or the like to form the base layer 4. The underlayer 4 formed of gravel or the like is an example, and any layer can be selected as long as the bottom surface of the hole can be hardened substantially smoothly.

  (4) Next, the foamed resin board 3 a is embedded on the foundation layer 4. The foamed resin board 3a places one foamed resin block, in which a plurality of recesses 5 previously formed on one side surface from the slope 6 and the bottom surface 7 are provided, in the hole portion with the recesses 5 facing upward. Can be formed.

  (5) A concrete casting mold is provided around the hole, and the solid foundation 2 is formed by placing, curing and curing the concrete from the embedded foamed resin board 3a. The formwork for placing concrete can be appropriately provided on the upper surface of the foamed resin board 3a so as to form a desired solid basic shape other than the above-described formwork provided around the hole. Further, the side surface of the hole that is not in contact with the foamed resin board 3a may be used as it is as a concrete casting mold. According to the above-described method, since the lower surface of the solid base 2 is integrally formed in contact with the upper surface of the foamed resin board 3a, the same concave / convex shape as the concave part 5 formed on the upper surface of the foamed resin board 3a is formed. It can be easily formed on the lower surface of the foundation 2. As a result, an uneven surface can be easily formed on at least a part of the interface formed by the upper surface of the foamed resin board 3a and the lower surface of the solid base 2. Thereby, the basic structure A1 of the present invention is completed.

  Next, as another embodiment, a method of forming the basic structure A5 shown in FIG. 9, that is, the basic structure A5 of the present invention having the foamed resin board 3e composed of the foamed resin concrete portion and the foamed resin block will be described.

  Determine the optimal dimensions, compressive strength, etc. of the solid foundation 2 and the foamed resin board 3e of the present invention by the same method as the above (1), and the basic structure A5 by the same method as the above (2) and (3). A hole and a base layer 4 for embedding are formed.

  Subsequently, a desired amount of foamed resin concrete is poured into the hole and cured and cured to form the foamed resin concrete portion 14. Next, the foamed resin block 15 is placed on the upper surface of the foamed resin concrete portion 14 to form the convex portion 16. Thereby, it is a foamed resin board which consists of the foamed resin concrete part 14 and the foamed resin block 15, Comprising: The foamed resin board 3e which has the convex part 16 on the upper surface can be formed.

  Next, concrete is placed on the foamed resin board 3e, and the solid foundation 2 formed integrally with the foamed resin board 3e is formed in the same manner as in the method described in the above (5), thereby providing a foundation structure A5. Can be formed.

Schematic diagram of a vertical section of an embodiment of the basic structure of the present invention 1 is a perspective view of a foamed resin board in the basic structure of FIG. Schematic diagram of a vertical section of an embodiment of the basic structure of the present invention FIG. 3 is a perspective view of a foamed resin board in the basic structure of FIG. Schematic diagram of a vertical section of an embodiment of the basic structure of the present invention FIG. 5 is a perspective view of a foamed resin board in the basic structure of FIG. Schematic diagram of a vertical section of an embodiment of the basic structure of the present invention 7 is a perspective view of the foamed resin board in the basic structure of FIG. Schematic diagram of a vertical section of an embodiment of the basic structure of the present invention FIG. 9 is a perspective view of a foamed resin board in the basic structure of FIG. Vertical cross-sectional schematic diagram of conventional foundation structure

Explanation of symbols

A1 Basic structure of the present invention A2 Basic structure of the present invention A3 Basic structure of the present invention A4 Basic structure of the present invention A5 Basic structure of the present invention 2 Solid foundation 3a Foamed resin board 3b Foamed resin board 3c Foamed resin board 3d Foamed resin board 3e Foamed resin board 5 Concave part 8 Concave part 9 Convex part 10 Foamed resin block 11 Foamed resin block 12 Convex part 13 Slope 14 Foamed resin concrete part 15 Foamed resin block 16 Convex part

Claims (7)

A foamed resin board embedded in a hole formed by discharging the ground, and a solid base integrally formed with the foamed resin board on an upper surface of the foamed resin board, 2 or more protrusions or two or more protrusions substantially formed by the presence of three or more recesses confirmed in the vertical cross section of the foamed resin board (by the presence of the protrusions or the recesses) except those with an air layer in a convex portion which is substantially formed) are continuously formed, and the lower surface of the mat foundation is formed on the upper surface of the foamed resin board 2 or more projections or By being formed so as to be in contact with the recess, an interface having two or more continuous uneven surfaces is formed between the upper surface of the foamed resin board and the lower surface of the solid base. Building foundation . The building base structure according to claim 1, wherein the foamed resin board is formed of a single foamed resin block. The foamed resin board is formed by a combination of a plurality of foamed resin blocks, and two or more convex parts (excluding those having an air layer) continuously formed on the upper surface of the foamed resin board are foamed. 2. The building foundation structure according to claim 1, which is a foamed resin block itself placed on the uppermost surface of the resin board. The building foundation structure according to any one of claims 1 to 3, wherein at least a part of a corner formed from a side surface and an upper surface of the foamed resin board is chamfered. 5. The building foundation according to claim 1, wherein the foamed resin board includes a foamed resin concrete portion formed from foamed resin concrete and a foamed resin block. Method of constructing a building foundation having a step of placing a foamed resin block to form a foamed resin board in a hole formed by discharging the ground, and then pouring concrete to form a solid foundation The foamed resin board has two or more convex parts on the upper surface thereof , or two or more convex parts substantially formed by the presence of three or more concave parts confirmed in a vertical cross section of the foamed resin board (the above convex parts). Or a continuous foundation provided with a concave portion or a convex portion substantially formed by the presence of the concave portion) , and pouring concrete from above the foamed resin board to form a solid foundation Accordingly, the foam building for groups and forming an interface with two or more continuous uneven surface between the resin plate of the upper surface and the lower surface of the mat foundation Construction method of the structure. In the construction method of a foundation structure for a building having a step of forming a foam resin board in a hole portion formed by discharging the ground, and then pouring concrete to form a solid foundation, the foam resin in the hole portion Concrete is poured and cured to form a foamed resin concrete part, and two or more foamed resin blocks are continuously formed on the upper surface by placing two or more foamed resin blocks on the upper surface of the foamed resin concrete part. that the convex portion to form a foamed resin board provided with the (except those having an air layer) and then by forming a mat foundation pouring concrete from the top of the foamed resin plate, wherein the upper surface of the foamed resin board building substructure, characterized by forming an interface having two or more continuous uneven surface between the lower surface of the mat foundation Construction methods.

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